1. A high-performance stoving type coating composition comprising: i. a resin in an amount in the range of 65 mass% to 85 mass% with respect to the total mass of said coating composition; ii. a first pigment in an amount in the range of 1 mass% to 10 mass% with respect to the total mass of said coating composition; iii. an extender in an amount in the range of 2 mass% to 7 mass% with respect to the total mass of said coating composition; iv. an additive in an amount in the range of 2 mass% to 10 mass% with respect to the total mass of said coating composition; v. a tinter in an amount in the range of 1 mass% to 10 mass% with respect to the total mass of said coating composition; and vi. a fluid medium in an amount in the range of 2 mass% to 15 mass% with respect to the total mass of said coating composition.

2. The composition as claimed in claim 1, wherein said resin comprises an alkyd resin in an amount in the range of 65 mass% to 75 mass%, a melamine formaldehyde resin in an amount in the range of 20 mass% to 25 mass%, a polyester resin in an amount in the range of 3 mass% to 6 mass%, and a blocked isocyanate resin in an amount in the range of 2 mass% to 5 mass%, wherein the amount of each ingredient is with respect to the total mass of said resin.

3. The composition as claimed in claim 2, wherein • said alkyd resin is at least one selected from the group consisting of glycerol-phthalic anhydride-fatty acid alkyd resin, pentaerythritol-phthalic anhydride- short-oil coconut alkyd resin, soya fatty acid-based medium-oil alkyd resin, glycerol-phthalic anhydride-medium-oil soya alkyd resin, dehydrated castor oil-based short oil alkyd resin, and pentaerythritol-phthalic anhydride- medium oil soya alkyd resin; • said melamine formaldehyde resin is at least one selected from the group consisting of butyl ether-modified melamine-formaldehyde resin, butylated hexamethyl melamine formaldehyde resin, N,N′,N″-tris(butoxymethyl)melamine formaldehyde resin, N,N′,N″,N‴,N⁗,N⁗′-hexakis(butoxymethyl) melamine formaldehyde resin, N,N′,N″,N‴,N⁗,N⁗′-hexakis(methoxymethyl) melamine formaldehyde resin, and etherified hexamethylol melamine formaldehyde resin; • said polyester resin is at least one selected from the group consisting of neopentyl glycol-adipic acid polyester polyol, neopentyl glycol-phthalic anhydride polyester polyol resin, ethylene glycol-adipic acid polyester polyol resin, neopentyl glycol-terephthalic acid hydroxyl-terminated polyester resin, adipic acid-neopentyl glycol carboxyl-terminated polyester resin, and maleic anhydride-propylene glycol unsaturated polyester resin; • said blocked isocyanate resin is at least one selected from the group consisting of pyrazole-blocked hexamethylene diisocyanate (HDI) trimer resin, pyrazole-blocked isophorone diisocyanate (IPDI) resin, pyrazole-blocked toluene diisocyanate (TDI) resin, ε-caprolactam-blocked HDI biuret resin, methyl ethyl ketoxime-blocked HDI trimer resin, and n-Butanol-blocked HDI resin.

4. The composition as claimed in claim 1, wherein. • said first pigment is at least one selected from the group consisting of white pigment, blue pigment, red pigment, and violet pigment; • said extender is barium sulphate; and • said additive is at least one selected from the group consisting of a wax additive, a wetting agent/dispersing agent, an anti-settling agent, an acid catalyst, and a surface tolerance agent.

5. The composition as claimed in claim 4, wherein • said wax additive is at least one selected from micronized PTFE-modified high-density polyethylene wax, micronized PTFE-modified oxidized polyethylene wax, ethylenediamine-adipic acid polyamide wax, and hexamethylenediamine-sebacic acid polyamide wax; • said wetting agent/dispersing agent is at least one selected from the group consisting of unsaturated fatty acid polyamide-phosphate ester salt, maleated polyamide-acid ester salt, sodium polyacrylate, ammonium polyacrylate, potassium polyacrylate, and polyether-modified polyurethane dispersant; • said anti-settling agent is at least one selected from the group consisting of quaternary ammonium salt-modified hectorite clay, dimethyl dihydrogenated tallow ammonium-modified hectorite clay, quaternary ammonium-modified bentonite clay, organophilic montmorillonite clay, and quaternary ammonium-modified synthetic hectorite; • said acid catalyst is at least one selected from the group consisting of p-toluenesulfonic acid (PTSA), methanesulfonic acid, dodecylbenzene sulfonic acid, benzenesulfonic acid, dimethyl ethanolamine phosphate, and triethylamine phosphate; and • said surface tolerance agent is at least one selected from the group consisting of polyether-modified polymethylalkyl siloxane, mono-alkyl phosphate esters, di-alkyl phosphate esters, polymeric phosphate esters, polyamine-modified polymer, and aminoalkyl silanes.

6. The composition as claimed in claim 1, wherein said tinter comprises: • a second pigment in an amount in the range of 12 mass% to 18 mass% with respect to the total mass of said tinter; • said resin in an amount in the range of 50 mass% to 65 mass% with respect to the total mass of said tinter; and • said fluid medium in an amount in the range of 20 mass% to 35 mass% with respect to the total mass of said tinter.

7. The composition as claimed in claim 6, wherein said second pigment is selected from the group consisting of violet pigment, yellow oxide pigment, blue pigment and black pigment.

8. The composition as claimed in claim 1, wherein said fluid medium is at least one selected from an alcohol and a hydrocarbon, wherein said alcohol is selected from methyl alcohol and butyl alcohol; and said hydrocarbon is selected from naphtha and an aromatic hydrocarbon.

9. The composition as claimed in claim 1, wherein said coating composition has: • solid content in the range of 50 mass% to 60 mass%; and • viscosity in the range of 55 seconds to 65 seconds, measured by using a cup B4 at 30 °C.

10. The composition as claimed in claim 1, wherein said coating composition is applied on a mild steel oily barrel to obtain a film, wherein said film has a dry film thickness in the range of 15 µm to 25 µm.

11. A process for the preparation of a high-performance stoving type coating composition, said process comprising the following steps: a. mixing first predetermined portions of a resin, a first pigment, an additive, and a fluid medium at a first predetermined speed for a first predetermined time period to obtain a mixture; b. adding a predetermined amount of an extender and second predetermined portions of said resin, said first pigment, said additive, and said fluid medium to said mixture followed by grinding at a second predetermined speed for a second predetermined time period to obtain a slurry; c. adding third predetermined portions of said resin, said additive and said fluid medium to said slurry at a third predetermined speed for a third predetermined time period to obtain a homogeneous slurry; and d. adding a predetermined amount of a tinter and a fourth predetermined portion of said fluid medium to said homogeneous slurry followed by mixing at a fourth predetermined speed for a fourth predetermined time period to obtain said coating composition.

12. The process as claimed in claim 11, wherein said resin comprises an alkyd resin in an amount in the range of 65 mass% to 75 mass%, a melamine formaldehyde resin in an amount in the range of 20 mass% to 25 mass%, a polyester resin in an amount in the range of 3 mass% to 6 mass%, and a blocked isocyanate resin in an amount in the range of 2 mass% to 5 mass%, wherein the amount of each ingredient is with respect to the total mass of said resin.

13. The process as claimed in claim 12, wherein • said alkyd resin is at least one selected from the group consisting of glycerol-phthalic anhydride-fatty acid alkyd resin, pentaerythritol-phthalic anhydride- short-oil coconut alkyd resin, soya fatty acid-based medium-oil alkyd resin, glycerol-phthalic anhydride-medium-oil soya alkyd resin, dehydrated castor oil-based short oil alkyd resin, and pentaerythritol-phthalic anhydride- medium oil soya alkyd resin; • said melamine formaldehyde resin is at least one selected from the group consisting of butyl ether-modified melamine-formaldehyde resin, butylated hexamethyl melamine formaldehyde resin, N,N′,N″-tris(butoxymethyl)melamine formaldehyde resin, N,N′,N″,N‴,N⁗,N⁗′-hexakis(butoxymethyl) melamine formaldehyde resin, N,N′,N″,N‴,N⁗,N⁗′-hexakis(methoxymethyl) melamine formaldehyde resin, and etherified hexamethylol melamine formaldehyde resin; • said polyester resin is at least one selected from the group consisting of neopentyl glycol-adipic acid polyester polyol resin, neopentyl glycol-phthalic anhydride polyester polyol resin, ethylene glycol-adipic acid polyester polyol resin, neopentyl glycol-terephthalic acid hydroxyl-terminated polyester resin, adipic acid-neopentyl glycol carboxyl-terminated polyester resin, and maleic anhydride-propylene glycol unsaturated polyester resin; • said blocked isocyanate resin is at least one selected from the group consisting of pyrazole-blocked hexamethylene diisocyanate (HDI) trimer resin, pyrazole-blocked isophorone diisocyanate (IPDI) resin, pyrazole-blocked toluene diisocyanate (TDI) resin, ε-caprolactam-blocked HDI biuret resin, methyl ethyl ketoxime-blocked HDI trimer resin, and n-Butanol-blocked HDI resin.

14. The process as claimed in claim 11, wherein • said first pigment is at least one selected from the group consisting of white pigment, blue pigment, red pigment, and violet pigment; and • said extender is barium sulphate.

15. The process as claimed in claim 11, wherein said additive is at least one selected from the group consisting of a wax additive, a wetting agent/dispersing agent, anti-settling agent, an acid catalyst, and surface tolerance agents.

16. The process as claimed in claim 15, wherein • said wax additive is at least one selected from micronized PTFE-modified high-density polyethylene wax, micronized PTFE-modified oxidized polyethylene wax, ethylenediamine-adipic acid polyamide wax, and hexamethylenediamine-sebacic acid polyamide wax; • said wetting agent/dispersing agent is at least one selected from the group consisting of unsaturated fatty acid polyamide-phosphate ester salt, maleated polyamide-acid ester salt, sodium polyacrylate, ammonium polyacrylate, potassium polyacrylate, and polyether-modified polyurethane dispersant; • said anti-settling agent is at least one selected from the group consisting of quaternary ammonium salt-modified hectorite clay, dimethyl dihydrogenated tallow ammonium-modified hectorite clay, quaternary ammonium-modified bentonite clay, organophilic montmorillonite clay, and quaternary ammonium-modified synthetic hectorite; • said acid catalyst is at least one selected from the group consisting of p-toluenesulfonic acid (PTSA), methanesulfonic acid, dodecylbenzene sulfonic acid, benzenesulfonic acid, dimethyl ethanolamine phosphate, and triethylamine phosphate; and • said surface tolerance agent is at least one selected from the group consisting of polyether-modified polymethylalkyl siloxane, mono-alkyl phosphate esters, di-alkyl phosphate esters, polymeric phosphate esters, polyamine-modified polymer, and aminoalkyl silanes.

17. The process as claimed in claim 11, wherein said tinter comprises: • a second pigment in an amount in the range of 12 mass% to 18 mass% with respect to the total mass of said tinter; • said resin in an amount in the range of 50 mass% to 65 mass% with respect to the total mass of said tinter; and • said fluid medium in an amount in the range of 20 mass% to 35 mass% with respect to the total mass of said tinter.

18. The process as claimed in claim 17, wherein said second pigment is selected from the group consisting of violet pigment, yellow oxide pigment, blue pigment and black pigment.

19. The process as claimed in claim 11, wherein said fluid medium is at least one selected from an alcohol and a hydrocarbon, wherein said alcohol is selected from methyl alcohol and butyl alcohol; and said hydrocarbon is selected from naphtha and aromatic hydrocarbons.

20. The process as claimed in claim 11, wherein • said resin is present in an amount in the range of 65 mass% to 85 mass% with respect to the total mass of said coating composition; • said first pigment is present in an amount in the range of 1 mass% to 10 mass% with respect to the total mass of said coating composition; • said extender is present in an amount in the range of 2 mass% to 7 mass% with respect to the total mass of said coating composition; • said additive is present in an amount in the range of 2 mass% to 7 mass% with respect to the total mass of said coating composition; • said tinter is present in an amount in the range of 4 mass% to 8 mass% with respect to the total mass of said coating composition; and • said fluid medium is present in an amount in the range of 5 mass% to 15 mass% with respect to the total mass of said coating composition.

21. The process as claimed in claim 11, wherein • said first predetermined portion of said resin is in the range of 12 mass% to 20 mass% with respect to the total mass of said resin; said second predetermined portion of said resin is in the range of 3 mass% to 10 mass% with respect to the total mass of said resin and said third predetermined portion of said resin is in the range of 70 mass% to 85 mass% with respect to the total mass of said resin; and • said first predetermined portion of said first pigment is in the range of 80 mass% to 90 mass% with respect to the total mass of said first pigment and said second predetermined portion of said first pigment is in the range of 10 mass% to 20 mass% with respect to the total mass of said first pigment.

22. The process as claimed in claim 11, wherein said first predetermined portion of said additive is in the range of 50 mass% to 65 mass% with respect to the total mass of said additive, said second predetermined portion of said additive is in the range of 10 mass% to 20 mass% with respect to the total mass of said additive, and said third predetermined portion of said additive is in the range of 20 mass% to 35 mass% with respect to the total mass of said additive.

23. The process as claimed in claim 11, wherein said first predetermined portion of said fluid medium is in the range of 5 mass% to 20 mass% with respect to the total mass of said fluid medium, said second predetermined portion of said fluid medium is in the range of 5 mass% to 20 mass% with respect to the total mass of said fluid medium, said third predetermined portion of said fluid medium is in the range of 30 mass% to 45 mass% with respect to the total mass of said fluid medium, and said fourth predetermined portion of said fluid medium is in the range of 30 mass% to 45 mass% with respect to the total mass of said fluid medium.

24. The process as claimed in claim 11, wherein • said first predetermined speed is in the range of 600 rpm to 1500 rpm; • said second predetermined speed is in the range of 2000 rpm to 3000 rpm; • said third predetermined speed is in the range of 1500 rpm to 3000 rpm; and • said fourth predetermined speed is in the range of 600 rpm to 2000 rpm.

25. The process as claimed in claim 11, wherein • said first predetermined time period is in the range of 5 minutes to 20 minutes; • said second predetermined time period is in the range of 30 minutes to 90 minutes; • said third predetermined time period is in the range of 5 minutes to 20 minutes; and • said fourth predetermined time period is in the range of 10 minutes to 20 minutes. Dated this 26th day of February, 2026 _______________________________ MOHAN RAJKUMAR DEWAN, IN/PA – 25 OF R. K. DEWAN & CO. AUTHORIZED AGENT OF APPLICANT TO, THE CONTROLLER OF PATENTS THE PATENT OFFICE, MUMBAI

Description:FIELD
The present disclosure relates to the field of industrial coatings. Particularly, the present disclosure relates to a high-performance stoving type (HPST) coating composition for oily barrels.
DEFINITIONS
As used in the present disclosure, the following terms are generally intended to have the meaning as set forth below, except to the extent that the context in which they are used, indicate otherwise.
Stoving type coating composition: The term “stoving type coating composition” or “baking enamels” refers to a heat curable coating composition that, upon thermal treatment, forms a hard, durable, and chemically resistant film.
Grinding H.G.: The term “Grinding H.G.” refers to the “Grinding Hegman” value, which indicates the fineness of grind of pigments and extenders in a coating composition. It is measured using a Hegman gauge, which is a standardized tool that assesses particle size distribution in a liquid dispersion.
Stoving schedule: The term “stoving schedule” refers to a controlled heating process used to cure or harden a coating, typically in industrial paints such as high-performance stoving type paint compositions.
MEK rubs: The term “MEK rubs” refers to a standardized test for solvent resistance of a cured coating film, using methyl ethyl ketone (MEK) as the solvent. It’s a quick and widely accepted method to assess how well a coating resists chemical attack and whether it has fully cured.
BACKGROUND
The background information herein below relates to the present disclosure but is not necessarily prior art.
Steel barrels are extensively used across various industries for the storage and transportation of chemicals, lubricants, and other industrial liquids due to their high strength, durability, and resistance to mechanical damage. However, during their manufacturing process, which typically involves forming, rolling, machining, and sometimes stamping, these barrels often acquire a thin layer of residual oil or lubricants used to reduce friction and prevent metal surface damage. The presence of these oily contaminants creates a significant challenge when applying protective or decorative coatings.
Conventional coatings rely on proper surface wetting and adhesion to form a uniform and durable film. When oil residues remain on the steel surface, they interfere with this process, leading to coating defects such as poor adhesion, surface cratering, blister formation, or even large-scale delamination during service and the like. Consequently, achieving a clean, oil-free surface is essential to ensure coating performance, corrosion protection, and long-term durability of the barrel in demanding industrial environments. Conventional air-dry or low-bake coatings typically require thorough surface preparation, including degreasing and abrasive cleaning, which adds cost and complexity to production. In high-throughput environments, such as drum manufacturing lines and the like, there is a need for coating systems that can tolerate moderate oil contamination while still delivering high performance.
Further, the reproducibility and performance consistency of these coatings mostly depend on the sequence, conditions, and techniques used during their preparation. Variations in pigment dispersion, resin incorporation, solvent balance, and additive integration can significantly affect the final film properties, such as adhesion, flow, and curing behaviour and the like.
Therefore, there exists a need for a coating composition for oily barrels and a process for its preparation that can mitigate the drawbacks mentioned hereinabove or at least provide an alternative solution.
OBJECTS
Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows.
An object of the present disclosure is to ameliorate one or more problems of the background or to at least provide a useful alternative.
Another object of the present disclosure is to provide a coating composition.
Still another object of the present disclosure is to provide a high-performance stoving type (HPST) coating composition for oily barrels.
Yet another object of the present disclosure is to provide a high-performance stoving type coating composition for oily barrels that requires less time for stoving.
Still another object of the present disclosure is to provide a high-performance stoving type coating composition for oily barrels that provides good adhesion.
Yet another object of the present disclosure is to provide a high-performance stoving type coating composition for oily barrels that is water resistant and chemical resistant.
Still another object of the present disclosure is to provide a process for the preparation of a high-performance stoving type coating composition for oily barrels that is simple and economical.
Other objects and advantages of the present disclosure will be more apparent from the following description, which is not intended to limit the scope of the present disclosure.
SUMMARY
The present disclosure relates to a high-performance stoving type coating composition comprising:
i. a resin in an amount in the range of 65 mass% to 85 mass% with respect to the total mass of the coating composition;
ii. a first pigment in an amount in the range of 1 mass% to 10 mass% with respect to the total mass of the coating composition;
iii. an extender in an amount in the range of 2 mass% to 7 mass% with respect to the total mass of the coating composition;
iv. an additive in an amount in the range of 2 mass% to 10 mass% with respect to the total mass of the coating composition;
v. a tinter in an amount in the range of 1 mass% to 10 mass% with respect to the total mass of the coating composition; and
vi. a fluid medium in an amount in the range of 2 mass% to 15 mass% with respect to the total mass of the coating composition.
In an embodiment of the present disclosure, the resin comprises an alkyd resin in an amount in the range of 65 mass% to 75 mass%, a melamine formaldehyde resin in an amount in the range of 20 mass% to 25 mass%, a polyester resin in an amount in the range of 3 mass% to 6 mass%, and a blocked isocyanate resin in an amount in the range of 2 mass% to 5 mass%, wherein the amount of each ingredient is with respect to the total mass of the resin.
In an embodiment of the present disclosure, the alkyd resin is at least one selected from the group consisting of glycerol-phthalic anhydride-fatty acid alkyd resin, pentaerythritol-phthalic anhydride- short-oil coconut alkyd resin, soya fatty acid-based medium-oil alkyd resin, glycerol-phthalic anhydride-medium-oil soya alkyd resin, dehydrated castor oil-based short oil alkyd resin, and pentaerythritol-phthalic anhydride- medium oil soya alkyd resin.
In an embodiment of the present disclosure, the melamine formaldehyde resin is at least one selected from the group consisting of butyl ether-modified melamine-formaldehyde resin, butylated hexamethyl melamine formaldehyde resin, N,N′,N″-tris(butoxymethyl)melamine formaldehyde resin, N,N′,N″,N‴,N⁗,N⁗′-hexakis(butoxymethyl) melamine formaldehyde resin, N,N′,N″,N‴,N⁗,N⁗′-hexakis(methoxymethyl) melamine formaldehyde resin, and etherified hexamethylol melamine formaldehyde resin.
In an embodiment of the present disclosure, the polyester resin is at least one selected from the group consisting of neopentyl glycol-adipic acid polyester polyol resin, neopentyl glycol-phthalic anhydride polyester polyol resin, ethylene glycol-adipic acid polyester polyol resin, neopentyl glycol-terephthalic acid hydroxyl-terminated polyester resin, adipic acid-neopentyl glycol carboxyl-terminated polyester resin, and maleic anhydride-propylene glycol unsaturated polyester resin.
In an embodiment of the present disclosure, the blocked isocyanate resin is at least one selected from the group consisting of pyrazole-blocked hexamethylene diisocyanate (HDI) trimer resin, pyrazole-blocked isophorone diisocyanate (IPDI) resin, pyrazole-blocked toluene diisocyanate (TDI) resin, ε-caprolactam-blocked HDI biuret resin, methyl ethyl ketoxime-blocked HDI trimer resin, and n-Butanol-blocked HDI resin.
In an embodiment of the present disclosure, the first pigment is at least one selected from the group consisting of white pigment, blue pigment, red pigment, and violet pigment.
In an embodiment of the present disclosure, the extender is barium sulphate.
In an embodiment of the present disclosure, the additive is at least one selected from the group consisting of a wax additive, a wetting agent/dispersing agent, an anti-settling agent, an acid catalyst, and a surface tolerance agent.
In an embodiment of the present disclosure, the wax additive is at least one selected from micronized PTFE-modified high-density polyethylene wax, micronized PTFE-modified oxidized polyethylene wax, ethylenediamine-adipic acid polyamide wax, and hexamethylenediamine-sebacic acid polyamide wax.
In an embodiment of the present disclosure, the wetting agent/dispersing agent is at least one selected from the group consisting of unsaturated fatty acid polyamide-phosphate ester salt, maleated polyamide-acid ester salt, sodium polyacrylate, ammonium polyacrylate, potassium polyacrylate, and polyether-modified polyurethane dispersant.
In an embodiment of the present disclosure, the anti-settling agent is at least one selected from the group consisting of quaternary ammonium salt-modified hectorite clay, dimethyl dihydrogenated tallow ammonium-modified hectorite clay, quaternary ammonium-modified bentonite clay, organophilic montmorillonite clay, and quaternary ammonium-modified synthetic hectorite clay.
In an embodiment of the present disclosure, the acid catalyst is at least one selected from the group consisting of p-toluenesulfonic acid (PTSA), methanesulfonic acid, dodecylbenzene sulfonic acid, benzenesulfonic acid, dimethyl ethanolamine phosphate, and triethylamine phosphate.
In an embodiment of the present disclosure, the surface tolerance agent is at least one selected from the group consisting of polyether-modified polymethylalkyl siloxane, mono-alkyl phosphate esters, di-alkyl phosphate esters, polymeric phosphate esters, polyamine-modified polymer, and aminoalkyl silanes.
In an embodiment of the present disclosure, the tinter comprises a second pigment in an amount in the range of 12 mass% to 18 mass% with respect to the total mass of the tinter, the resin in an amount in the range of 50 mass% to 65 mass% with respect to the total mass of the tinter and the fluid medium in an amount in the range of 20 mass% to 35 mass% with respect to the total mass of the tinter, wherein the second pigment is selected from the group consisting of violet pigment, yellow oxide pigment, blue pigment and black pigment.
In an embodiment of the present disclosure, the fluid medium is at least one selected from an alcohol and a hydrocarbon, wherein the alcohol is selected from methyl alcohol and butyl alcohol; and the hydrocarbon is selected from naphtha and aromatic hydrocarbons.
In an embodiment of the present disclosure, the coating composition has solid content in the range of 50 mass% to 60 mass%, and viscosity in the range of 55 seconds to 65 seconds, measured by using a cup B4 at 30 °C.
In an embodiment of the present disclosure, the coating composition is applied on a mild steel oily barrel to obtain a film, wherein the film has a dry film thickness in the range of 15 µm to 25 µm.
In another aspect, the present disclosure relates to a process for the preparation of a high-performance stoving type coating composition, the process comprising the following steps:
a. mixing first predetermined portions of a resin, a first pigment, an additive, and a fluid medium at a first predetermined speed for a first predetermined time period to obtain a mixture;
b. adding predetermined amount of an extender and second predetermined portions of the resin, the first pigment, the additive, and the fluid medium to the mixture followed by grinding at a second predetermined speed for a second predetermined time period to obtain a slurry;
c. adding third predetermined portions of the resin, the additive and the fluid medium to the slurry at a third predetermined speed for a third predetermined time period to obtain a homogeneous slurry; and
d. adding predetermined amount of a tinter and a fourth predetermined portion of the fluid medium to the homogeneous slurry followed by mixing at a fourth predetermined speed for a fourth predetermined time period to obtain the coating composition.
In an embodiment of the present disclosure, the resin comprises an alkyd resin in an amount in the range of 65 mass% to 75 mass%, a melamine formaldehyde resin in an amount in the range of 20 mass% to 25 mass%, a polyester resin in an amount in the range of 3 mass% to 6 mass%, and a blocked isocyanate resin in an amount in the range of 2 mass% to 5 mass%, wherein the amount of each ingredient is with respect to the total mass of the resin.
In an embodiment of the present disclosure, the alkyd resin is at least one selected from the group consisting of glycerol-phthalic anhydride-fatty acid alkyd resin, pentaerythritol-phthalic anhydride- short-oil coconut alkyd resin, soya fatty acid-based medium-oil alkyd resin, glycerol-phthalic anhydride-medium-oil soya alkyd resin, dehydrated castor oil-based short oil alkyd resin, and pentaerythritol-phthalic anhydride- medium oil soya alkyd resin.
In an embodiment of the present disclosure, the melamine formaldehyde resin is at least one selected from the group consisting of butyl ether-modified melamine-formaldehyde resin, butylated hexamethyl melamine formaldehyde resin, N,N′,N″-tris(butoxymethyl)melamine formaldehyde resin, N,N′,N″,N‴,N⁗,N⁗′-hexakis(butoxymethyl) melamine formaldehyde resin, N,N′,N″,N‴,N⁗,N⁗′-hexakis(methoxymethyl) melamine formaldehyde resin, and etherified hexamethylol melamine formaldehyde resin.
In an embodiment of the present disclosure, the polyester resin is at least one selected from the group consisting of neopentyl glycol-adipic acid polyester polyol resin, neopentyl glycol-phthalic anhydride polyester polyol resin, ethylene glycol-adipic acid polyester polyol resin, neopentyl glycol-terephthalic acid hydroxyl-terminated polyester resin, adipic acid-neopentyl glycol carboxyl-terminated polyester resin, and maleic anhydride-propylene glycol unsaturated polyester resin.
In an embodiment of the present disclosure, the blocked isocyanate resin is at least one selected from the group consisting of pyrazole-blocked hexamethylene diisocyanate (HDI) trimer resin, pyrazole-blocked isophorone diisocyanate (IPDI) resin, pyrazole-blocked toluene diisocyanate (TDI) resin, ε-caprolactam-blocked HDI biuret resin, methyl ethyl ketoxime-blocked HDI trimer resin, and n-Butanol-blocked HDI resin.
In an embodiment of the present disclosure, the first pigment is at least one selected from the group consisting of white pigment, blue pigment, red pigment, and violet pigment.
In an embodiment of the present disclosure, the extender is barium sulphate.
In an embodiment of the present disclosure, the additive is at least one selected from the group consisting of a wax additive, a wetting agent/dispersing agent, an anti-settling agent, an acid catalyst, and a surface tolerance agent.
In an embodiment of the present disclosure, the wax additive is at least one selected from micronized PTFE-modified high-density polyethylene wax, micronized PTFE-modified oxidized polyethylene wax, ethylenediamine-adipic acid polyamide wax, and hexamethylenediamine-sebacic acid polyamide wax.
In an embodiment of the present disclosure, the wetting agent/dispersing agent is at least one selected from the group consisting of unsaturated fatty acid polyamide-phosphate ester salt, maleated polyamide-acid ester salt, sodium polyacrylate, ammonium polyacrylate, potassium polyacrylate, and polyether-modified polyurethane dispersant.
In an embodiment of the present disclosure, the anti-settling agent is at least one selected from the group consisting of quaternary ammonium salt-modified hectorite clay, dimethyl dihydrogenated tallow ammonium-modified hectorite clay, quaternary ammonium-modified bentonite clay, organophilic montmorillonite clay, and quaternary ammonium-modified synthetic hectorite.
In an embodiment of the present disclosure, the acid catalyst is at least one selected from the group consisting of p-toluenesulfonic acid (PTSA), methanesulfonic acid, dodecylbenzene sulfonic acid, benzenesulfonic acid, dimethyl ethanolamine phosphate, and triethylamine phosphate.
In an embodiment of the present disclosure, the surface tolerance agent is at least one selected from the group consisting of polyether-modified polymethylalkyl siloxane, mono-alkyl phosphate esters, di-alkyl phosphate esters, polymeric phosphate esters, polyamine-modified polymer, and aminoalkyl silanes.
In an embodiment of the present disclosure, the tinter comprises a second pigment in an amount in the range of 12 mass% to 18 mass% with respect to the total mass of the tinter, the resin in an amount in the range of 50 mass% to 65 mass% with respect to the total mass of the tinter and the fluid medium in an amount in the range of 20 mass% to 35 mass% with respect to the total mass of the tinter, wherein the second pigment is selected from the group consisting of violet pigment, yellow oxide pigment, blue pigment and black pigment.
In an embodiment of the present disclosure, the fluid medium is at least one selected from an alcohol and a hydrocarbon, wherein the alcohol is selected from methyl alcohol and butyl alcohol; and the hydrocarbon is selected from naphtha and aromatic hydrocarbons.
In an embodiment of the present disclosure, the resin is present in an amount in the range of 65 mass% to 85 mass% with respect to the total mass of the coating composition.
In an embodiment of the present disclosure, the first pigment is present in an amount in the range of 3 mass% to 7 mass% with respect to the total mass of the coating composition.
In an embodiment of the present disclosure, the extender is present in an amount in the range of 2 mass% to 7 mass% with respect to the total mass of the coating composition.
In an embodiment of the present disclosure, the additive is present in an amount in the range of 2 mass% to 7 mass% with respect to the total mass of the coating composition.
In an embodiment of the present disclosure, the tinter is present in an amount in the range of 4 mass% to 8 mass% with respect to the total mass of the coating composition.
In an embodiment of the present disclosure, the fluid medium is present in an amount in the range of 5 mass% to 15 mass% with respect to the total mass of the coating composition.
In an embodiment of the present disclosure, the first predetermined portion of the resin is in the range of 12 mass% to 20 mass% with respect to the total mass of the resin; the second predetermined portion of the resin is in the range of 3 mass% to 10 mass% with respect to the total mass of the resin and the third predetermined portion of the resin is in the range of 70 mass% to 85 mass% with respect to the total mass of the resin.
In an embodiment of the present disclosure, the first predetermined portion of the first pigment is in the range of 80 mass% to 90 mass% with respect to the total mass of the first pigment and the second predetermined portion of the first pigment is in the range of 10 mass% to 20 mass% with respect to the total mass of the first pigment.
In an embodiment of the present disclosure, the first predetermined portion of the additive is in the range of 50 mass% to 65 mass% with respect to the total mass of the additive, the second predetermined portion of the additive is in the range of 10 mass% to 20 mass% with respect to the total mass of the additive, and the third predetermined portion of the additive is in the range of 20 mass% to 35 mass% with respect to the total mass of the additive.
In an embodiment of the present disclosure, first predetermined portion of the fluid medium is in the range of 5 mass% to 20 mass% with respect to the total mass of the fluid medium, the second predetermined portion of the fluid medium is in the range of 5 mass% to 20 mass% with respect to the total mass of the fluid medium, the third predetermined portion of the fluid medium is in the range of 30 mass% to 45 mass% with respect to the total mass of the fluid medium, and the fourth predetermined portion of the fluid medium is in the range of 30 mass% to 45 mass% with respect to the total mass of the fluid medium.
In an embodiment of the present disclosure, the first predetermined speed is in the range of 600 rpm to 1500 rpm.
In an embodiment of the present disclosure, the second predetermined speed is in the range of 2000 rpm to 3000 rpm.
In an embodiment of the present disclosure, the third predetermined speed is in the range of 1500 rpm to 3000 rpm.
In an embodiment of the present disclosure, the fourth predetermined speed is in the range of 600 rpm to 2000 rpm.
In an embodiment of the present disclosure, the first predetermined time period is in the range of 5 minutes to 20 minutes.
In an embodiment of the present disclosure, the second predetermined time period is in the range of 30 minutes to 90 minutes.
In an embodiment of the present disclosure, the third predetermined time period is in the range of 5 minutes to 20 minutes.
In an embodiment of the present disclosure, the fourth predetermined time period is in the range of 10 minutes to 20 minutes.
DETAILED DESCRIPTION
The present disclosure relates to the field of industrial coatings. Particularly, the present disclosure relates to a high-performance stoving type (HPST) coating composition for oily barrels.
Embodiments, of the present disclosure, will now be described herein. Embodiments are provided so as to thoroughly and fully convey the scope of the present disclosure to the person skilled in the art. Numerous details are set forth, relating to specific components, and methods, to provide a complete understanding of embodiments of the present disclosure. It will be apparent to the person skilled in the art that the details provided in the embodiments should not be construed to limit the scope of the present disclosure. In some embodiments, well-known processes, well-known apparatus structures, and well-known techniques are not described in detail.
The terminology used, in the present disclosure, is only for the purpose of explaining a particular embodiment and such terminology shall not be considered to limit the scope of the present disclosure. As used in the present disclosure, the forms "a,” "an," and "the" may be intended to include the plural forms as well, unless the context clearly suggests otherwise. The terms "comprises," "comprising," “including,” and “having,” are open ended transitional phrases and therefore specify the presence of stated features, integers, steps, operations, elements, modules, units and/or components, but do not forbid the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The particular order of steps disclosed in the method and process of the present disclosure is not to be construed as necessarily requiring their performance as described or illustrated. It is also to be understood that additional or alternative steps may be employed.
As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed elements.
The terms first, second, third, etc., should not be construed to limit the scope of the present disclosure as the aforementioned terms may be only used to distinguish one element, component, region, layer or section from another component, region, layer or section. Terms such as first, second, third etc., when used herein do not imply a specific sequence or order unless clearly suggested by the present disclosure.
Conventional coatings rely on proper surface wetting and adhesion to form a uniform and durable film. When oil residues remain on the steel surface, they interfere with this process, leading to coating defects such as poor adhesion, surface cratering, blister formation, or even large-scale delamination during service. Consequently, achieving a clean, oil-free surface is essential to ensure coating performance, corrosion protection, and long-term durability of the barrel in demanding industrial environments. Conventional air-dry or low-bake coatings typically require thorough surface preparation, including degreasing and abrasive cleaning, which adds cost and complexity to production. In high-throughput environments, such as drum manufacturing lines, there is a need for coating systems that can tolerate moderate oil contamination while still delivering high performance.
Further, the reproducibility and performance consistency of these coatings mostly depend on the sequence, conditions, and techniques used during their preparation. Variations in pigment dispersion, resin incorporation, solvent balance, and the integration can significantly affect the final film properties, including adhesion, flow, and curing behaviour.
The present disclosure provides a coating composition. The coating composition of the present disclosure is a high-performance stoving type coating composition that is suitable for oily steel barrels.
In an aspect, the present disclosure provides a high-performance stoving type coating composition comprising:
i. a resin in an amount in the range of 65 mass% to 85 mass% with respect to the total mass of the coating composition;
ii. a first pigment in an amount in the range of 1 mass% to 10 mass% with respect to the total mass of the coating composition;
iii. an extender in an amount in the range of 2 mass% to 7 mass% with respect to the total mass of the coating composition;
iv. an additive in an amount in the range of 2 mass% to 10 mass% with respect to the total mass of the coating composition;
v. a tinter in an amount in the range of 1 mass% to 10 mass% with respect to the total mass of the coating composition; and
vi. a fluid medium in an amount in the range of 2 mass% to 15 mass% with respect to the total mass of the coating composition.
In an embodiment of the present disclosure, the resin comprises an alkyd resin in an amount in the range of 65 mass% to 75 mass%, a melamine formaldehyde resin in an amount in the range of 20 mass% to 25 mass%, a polyester resin in an amount in the range of 3 mass% to 6 mass%, and a blocked isocyanate resin in an amount in the range of 2 mass% to 5 mass%, wherein the amount of each ingredient is with respect to the total mass of the resin.
In an embodiment of the present disclosure, the alkyd resin is at least one selected from the group consisting of glycerol-phthalic anhydride-fatty acid alkyd resin, pentaerythritol-phthalic anhydride- short-oil coconut alkyd resin, soya fatty acid-based medium-oil alkyd resin, glycerol-phthalic anhydride-medium-oil soya alkyd resin, dehydrated castor oil-based short oil alkyd resin, and pentaerythritol-phthalic anhydride- medium oil soya alkyd resin. All embodiments are exemplified.
In an embodiment of the present disclosure the melamine formaldehyde resin is at least one selected from the group consisting of butyl ether-modified melamine-formaldehyde resin, butylated hexamethyl melamine formaldehyde resin, N,N′,N″-tris(butoxymethyl)melamine formaldehyde resin, N,N′,N″,N‴,N⁗,N⁗′-hexakis(butoxymethyl) melamine formaldehyde resin, N,N′,N″,N‴,N⁗,N⁗′-hexakis(methoxymethyl) melamine formaldehyde resin, and etherified hexamethylol melamine formaldehyde resin. All embodiments are exemplified.
In an embodiment of the present disclosure, the polyester resin is at least one selected from the group consisting of neopentyl glycol-adipic acid polyester polyol resin, neopentyl glycol-phthalic anhydride polyester polyol resin, ethylene glycol-adipic acid polyester polyol resin, neopentyl glycol-terephthalic acid hydroxyl-terminated polyester resin, adipic acid-neopentyl glycol carboxyl-terminated polyester resin, and maleic anhydride-propylene glycol unsaturated polyester resin. All embodiments are exemplified.
In an embodiment of the present disclosure, the blocked isocyanate resin is at least one selected from the group consisting of pyrazole-blocked hexamethylene diisocyanate (HDI) trimer resin, pyrazole-blocked isophorone diisocyanate (IPDI) resin, pyrazole-blocked toluene diisocyanate (TDI) resin, ε-caprolactam-blocked HDI biuret resin, methyl ethyl ketoxime-blocked HDI trimer resin, and n-Butanol-blocked HDI resin. All embodiments are exemplified.
In an exemplary embodiment, the resin comprises glycerol-phthalic anhydride-fatty acid alkyd resin in an amount of 68 mass%, butyl ether-modified melamine-formaldehyde resin in an amount of 22.66 mass%, neopentyl glycol-adipic acid polyester polyol resin in an amount of 5.33 mass%, and pyrazole-blocked hexamethylene diisocyanate (HDI) trimer resin in an amount of 4 mass%, wherein the amount of each ingredient is with respect to the total mass of the resin.
In an embodiment of the present disclosure, the first pigment is at least one selected from the group consisting of white pigment (titanium dioxide), blue pigment (phthalo blue), red pigment (rubine red), and violet pigment (fast violet). In an exemplary embodiment, the first pigment is phthalocyanine blue.
In an embodiment of the present disclosure, the extender is barium sulphate.
In an embodiment of the present disclosure, the additive is at least one selected from the group consisting of a wax additive, a wetting agent/dispersing agent, anti-settling agent, an acid catalyst, and a surface tolerance agent.
In an embodiment of the present disclosure, the wax additive is at least one selected from micronized PTFE-modified high-density polyethylene wax, micronized PTFE-modified oxidized polyethylene wax, ethylenediamine-adipic acid polyamide wax, and hexamethylenediamine-sebacic acid polyamide wax. All embodiments are exemplified.
In an embodiment of the present disclosure, the wetting agent/dispersing agent is at least one selected from the group consisting of unsaturated fatty acid polyamide-phosphate ester salt, maleated polyamide-acid ester salt, sodium polyacrylate, ammonium polyacrylate, potassium polyacrylate, and polyether-modified polyurethane dispersant. All embodiments are exemplified.
In an embodiment of the present disclosure, the anti-settling agent is at least one selected from the group consisting of quaternary ammonium salt-modified hectorite clay, dimethyl dihydrogenated tallow ammonium-modified hectorite clay, quaternary ammonium-modified bentonite clay, organophilic montmorillonite clay, and quaternary ammonium-modified synthetic hectorite clay. All embodiments are exemplified.
In an embodiment of the present disclosure, the acid catalyst is at least one selected from the group consisting of p-toluenesulfonic acid (PTSA), methanesulfonic acid, dodecylbenzene sulfonic acid, benzenesulfonic acid, dimethyl ethanolamine phosphate, and triethylamine phosphate. All embodiments are exemplified.
In an embodiment of the present disclosure, the surface tolerance agent is at least one selected from the group consisting of polyether-modified polymethylalkyl siloxane, mono-alkyl phosphate esters, di-alkyl phosphate esters, polymeric phosphate esters, polyamine-modified polymer, and aminoalkyl silanes. All embodiments are exemplified. In an embodiment of the present disclosure, the tinter comprises a second pigment in an amount in the range of 12 mass% to 18 mass% with respect to the total mass of the tinter, the resin in an amount in the range of 50 mass% to 65 mass% with respect to the total mass of the tinter and the fluid medium in an amount in the range of 20 mass% to 35 mass% with respect to the total mass of the tinter, wherein the second pigment is selected from the group consisting of violet pigment, yellow oxide pigment, blue pigment and black pigment.
In an exemplary embodiment, the tinter comprises 14. 29 mass% of blue pigment, 57.14 mass% of glycerol-phthalic anhydride-fatty acid alkyd resin, and 28.57 mass% of methyl alcohol.
In an embodiment of the present disclosure, the fluid medium is at least one selected from an alcohol and a hydrocarbon, wherein the alcohol is selected from methyl alcohol and butyl alcohol; and the hydrocarbon is selected from naphtha and an aromatic hydrocarbons. In an exemplary embodiment, the fluid medium is a combination of butyl alcohol and a heavy naphtha (C7-C11).
In an embodiment of the present disclosure, the coating composition has solid contents in the range of 50 mass% to 60 mass%, and viscosity in the range of 55 seconds to 65 seconds.
In an embodiment of the present disclosure, the coating composition has solid contents in the range of 50 mass% to 60 mass%, and viscosity in the range of 55 seconds to 65 seconds, measured using a cup B4 at 30 °C, corresponding to approximately 150 cP to 200 cP. In an exemplary embodiment, the coating composition has solid contents of 56 mass%, and viscosity of 60 seconds measured using a cup B4 at 30 °C.
In another aspect, the present disclosure relates to a process for the preparation of a high-performance stoving type coating composition, the process comprising the following steps:
a. mixing first predetermined portions of a resin, a first pigment, an additive, and a fluid medium at a first predetermined speed for a first predetermined time period to obtain a mixture;
b. adding predetermined amount of an extender and second predetermined portions of the resin, the first pigment, the additive, and the fluid medium to the mixture followed by grinding at a second predetermined speed for a second predetermined time period to obtain a slurry;
c. adding third predetermined portions of the resin, the additive and the fluid medium to the slurry at a third predetermined speed for a third predetermined time period to obtain a homogeneous slurry; and
d. adding predetermined amount of a tinter and a fourth predetermined portion of the fluid medium to the homogeneous slurry followed by mixing at a fourth predetermined speed for a fourth predetermined time period to obtain the coating composition.
The process is described in detail.
In a first step, first predetermined portions of a resin, a first pigment, an additive, and a fluid medium are mixed at a first predetermined speed for a first predetermined time period to obtain a mixture.
In an embodiment of the present disclosure, the resin comprises an alkyd resin in an amount in the range of 65 mass% to 75 mass%, a melamine formaldehyde resin in an amount in the range of 20 mass% to 25 mass%, a polyester resin in an amount in the range of 3 mass% to 6 mass%, and a blocked isocyanate resin in an amount in the range of 2 mass% to 5 mass%, wherein the amount of each ingredient is with respect to the total mass of the resin.
In an embodiment of the present disclosure, the alkyd resin is at least one selected from the group consisting of glycerol-phthalic anhydride-fatty acid alkyd resin, pentaerythritol-phthalic anhydride- short-oil coconut alkyd resin, soya fatty acid-based medium-oil alkyd resin, glycerol-phthalic anhydride-medium-oil soya alkyd resin, dehydrated castor oil-based short oil alkyd resin, and pentaerythritol-phthalic anhydride- medium oil soya alkyd resin. All embodiments are exemplified.
In an embodiment of the present disclosure the melamine formaldehyde resin is at least one selected from the group consisting of butyl ether-modified melamine-formaldehyde resin, butylated hexamethyl melamine formaldehyde resin, N,N′,N″-tris(butoxymethyl)melamine formaldehyde resin, N,N′,N″,N‴,N⁗,N⁗′-hexakis(butoxymethyl) melamine formaldehyde resin, N,N′,N″,N‴,N⁗,N⁗′-hexakis(methoxymethyl) melamine formaldehyde resin, and etherified hexamethylol melamine formaldehyde resin. All embodiments are exemplified.

In an embodiment of the present disclosure, the polyester resin is at least one selected from the group consisting of neopentyl glycol-adipic acid polyester polyol resin, neopentyl glycol-phthalic anhydride polyester polyol resin, ethylene glycol-adipic acid polyester polyol resin, neopentyl glycol-terephthalic acid hydroxyl-terminated polyester resin, adipic acid-neopentyl glycol carboxyl-terminated polyester resin, and maleic anhydride-propylene glycol unsaturated polyester resin. All embodiments are exemplified.
In an embodiment of the present disclosure, the blocked isocyanate resin is at least one selected from the group consisting of pyrazole-blocked hexamethylene diisocyanate (HDI) trimer resin, pyrazole-blocked isophorone diisocyanate (IPDI) resin, pyrazole-blocked toluene diisocyanate (TDI) resin, ε-caprolactam-blocked HDI biuret resin, methyl ethyl ketoxime-blocked HDI trimer resin, and n-Butanol-blocked HDI resin. All embodiments are exemplified. In an exemplary embodiment, the resin comprises glycerol-phthalic anhydride-fatty acid alkyd resin in an amount of 68 mass%, butyl ether-modified melamine-formaldehyde resin in an amount of 22.66 mass%, neopentyl glycol-adipic acid polyester polyol resin in an amount of 5.33 mass%, and pyrazole-blocked hexamethylene diisocyanate (HDI) trimer resin in an amount of 4 mass%, wherein the amount of each ingredient is with respect to the total mass of the resin.
In an embodiment of the present disclosure, the resin is present in an amount in the range of 65 mass% to 85 mass% with respect to the total mass of the coating composition. In an exemplary embodiment, the resin is present in an amount of 75 mass% with respect to the total mass of the coating composition.
In an embodiment of the present disclosure, the first predetermined portion of the resin is in the range of 12 mass% to 20 mass% with respect to the total mass of the resin. In an exemplary embodiment, the first predetermined portion of the resin is 16 mass% with respect to the total mass of the resin.
In an embodiment of the present disclosure, the first pigment is at least one selected from the group consisting of white pigment (titanium dioxide), blue pigment (phthalo blue), red pigment (rubine red), and violet pigment (fast violet). In an exemplary embodiment, the first pigment is phthalocyanine blue pigment.
In an embodiment of the present disclosure, the first pigment is present in an amount in the range of 1 mass% to 10 mass% with respect to the total mass of the coating composition. In an exemplary embodiment, the first pigment is present in an amount of 4.6 mass% with respect to the total mass of the coating composition.
In an embodiment of the present disclosure, the first predetermined portion of the first pigment is in the range of 80 mass% to 90 mass% with respect to the total mass of the first pigment. In an exemplary embodiment, the first predetermined portion of the first pigment is 86.96 mass% with respect to the total mass of the first pigment.
In an embodiment of the present disclosure, the additive is at least one selected from the group consisting of a wax additive, a wetting/dispersing agent, an anti-settling agent, an acid catalyst, and a surface tolerance agent.
In an embodiment of the present disclosure, the wax additive is at least one selected from micronized PTFE-modified high-density polyethylene wax, micronized PTFE-modified oxidized polyethylene wax, ethylenediamine-adipic acid polyamide wax, and hexamethylenediamine-sebacic acid polyamide wax. All embodiments are exemplified.
In an embodiment of the present disclosure, the wetting agent/dispersing agent is at least one selected from the group consisting of unsaturated fatty acid polyamide-phosphate ester salt, maleated polyamide-acid ester salt, sodium polyacrylate, ammonium polyacrylate, potassium polyacrylate, and polyether-modified polyurethane dispersant. All embodiments are exemplified.
In an embodiment of the present disclosure, the anti-settling agent is at least one selected from the group consisting of quaternary ammonium salt-modified hectorite clay, dimethyl dihydrogenated tallow ammonium-modified hectorite clay, quaternary ammonium-modified bentonite clay, organophilic montmorillonite clay, and quaternary ammonium-modified synthetic hectorite clay. All embodiments are exemplified.
In an embodiment of the present disclosure, the acid catalyst is at least one selected from the group consisting of p-toluenesulfonic acid (PTSA), methanesulfonic acid, dodecylbenzene sulfonic acid, benzenesulfonic acid, dimethyl ethanolamine phosphate, and triethylamine phosphate. All embodiments are exemplified. In an embodiment of the present disclosure, the surface tolerance agent is at least one selected from the group consisting of polyether-modified polymethylalkyl siloxane, mono-alkyl phosphate esters, di-alkyl phosphate esters, polymeric phosphate esters, polyamine-modified polymer, and aminoalkyl silanes. All embodiments are exemplified. In an exemplary embodiment, the additive is a combination of a wetting/dispersing agent and an acid catalyst.
In an embodiment of the present disclosure, the additive is present in an amount in the range of 2 mass% to 7 mass% with respect to the total mass of the coating composition. In an exemplary embodiment, the additive is present in an amount of 3.5 mass% with respect to the total mass of the coating composition.
In an embodiment of the present disclosure, the first predetermined portion of the additive is in the range of 50 mass% to 65 mass% with respect to the total mass of the additive. In an exemplary embodiment, the first predetermined portion of the additive is 57.14 mass% with respect to the total mass of the additive.
In an embodiment of the present disclosure, the fluid medium is at least one selected from an alcohol and a hydrocarbon, wherein the alcohol is selected from butyl alcohol and methyl alcohol; and the hydrocarbon is selected from naphtha and heavy naphtha (C7-C11).
In an exemplary embodiment, the fluid medium is a combination of butyl alcohol and an heavy naphtha (C7-C11)
In an embodiment of the present disclosure, the fluid medium is present in an amount in the range of 5 mass% to 15 mass% with respect to the total mass of the coating composition. In an exemplary embodiment, fluid medium is present in an amount of 7.9 mass% with respect to the total mass of the coating composition.
In an embodiment of the present disclosure, the first predetermined portion of the fluid medium is in the range of 5 mass% to 20 mass% with respect to the total mass of the fluid medium. In an exemplary embodiment, the first predetermined portion of the fluid medium is 12.66 mass% with respect to the total mass of the fluid medium.
In an embodiment of the present disclosure, the first predetermined speed is in the range of 600 rpm to 1500 rpm. In an exemplary embodiment, the first predetermined speed is 1000 rpm.
In an embodiment of the present disclosure, the first predetermined time period is in the range of 5 minutes to 20 minutes. In an exemplary embodiment, the first predetermined time period is 10 minutes.
In a second step, predetermined amount of an extender and second predetermined portions of the resin, the first pigment, the additive, and the fluid medium are added to the mixture followed by grinding at a second predetermined speed for a second predetermined time period to obtain a slurry.
In an embodiment of the present disclosure, the second predetermined speed is in the range of 2000 rpm to 3000 rpm. In an exemplary embodiment, the second predetermined speed is 2500 rpm.
In an embodiment of the present disclosure, the second predetermined time period is in the range of 30 minutes to 90 minutes. In an exemplary embodiment, the second predetermined time period is 60 minutes.
In an embodiment of the present disclosure, the extender is barium sulphate.
In an embodiment of the present disclosure, the extender is present in an amount in the range of 2 mass% to 7 mass% with respect to the total mass of the coating composition. In an exemplary embodiment, the extender is present in an amount of 3 mass% with respect to the total mass of the coating composition.
In an embodiment of the present disclosure, the second predetermined portion of the resin is 3 mass% to 10 mass% with respect to the total mass of the resin. In an exemplary embodiment, the second predetermined portion of the resin is 5.33 mass% with respect to the total mass of the resin.
In an embodiment of the present disclosure, the second predetermined portion of the first pigment is 10 mass% to 20 mass% with respect to the total mass of the first pigment. In an exemplary embodiment, the second predetermined portion of the first pigment is 13.04 mass% with respect to the total mass of the first pigment.
In an embodiment of the present disclosure, the second predetermined portion of the additive is 10 mass% to 20 mass% with respect to the total mass of the additive. In an exemplary embodiment, the second predetermined portion of the additive is 14.26 mass% with respect to the total mass of the additive.
In an embodiment of the present disclosure, the second predetermined portion of the fluid medium is 5 mass% to 20 mass% with respect to the total mass of the fluid medium. In an exemplary embodiment, the second predetermined portion of the fluid medium is 12.66 mass% with respect to the total mass of the fluid medium.
In an embodiment of the present disclosure, the second predetermined speed is in the range of 2000 rpm to 3000 rpm. In an exemplary embodiment, the second predetermined speed is 2500 rpm.
In an embodiment of the present disclosure, the second predetermined time period is in the range of 30 minutes to 90 minutes. In an exemplary embodiment, the second predetermined time period is 60 minutes.
In a third step, third predetermined portions of the resin, the additive and the fluid medium are added to the slurry at a third predetermined speed for a third predetermined time period to obtain a homogeneous slurry.
In an embodiment of the present disclosure, the third predetermined portion of the resin is in the range of 70 mass% to 85 mass% with respect to the total mass of the resin. In an exemplary embodiment, the third predetermined portion of the resin is 78.66 mass% with respect to the total mass of the resin.
In an embodiment of the present disclosure, the third predetermined portion of the additive is in the range of 20 mass% to 35 mass% with respect to the total mass of the additive. In an exemplary embodiment, the third predetermined portion of the additive is 28.57 mass% % with respect to the total mass of the additive.
In an embodiment of the present disclosure, the third predetermined portion of the fluid medium is in the range of 30 mass% to 45 mass% with respect to the total mass of the fluid medium. In an exemplary embodiment, the third predetermined portion of the fluid medium is 37.97 mass% with respect to the total mass of the fluid medium.
In an embodiment of the present disclosure, the third predetermined speed is in the range of 1500 rpm to 3000 rpm. In an exemplary embodiment, the third predetermined speed is 2000 rpm.
In an embodiment of the present disclosure, the third predetermined time period is in the range of 5 minutes to 20 minutes. In an exemplary embodiment, the third predetermined time period is 10 minutes.
In a final step, predetermined amount of a tinter and a fourth predetermined portion of the fluid medium are added to the homogeneous slurry followed by mixing at a fourth predetermined speed for a fourth predetermined time period to obtain said coating composition.
In an embodiment of the present disclosure, the tinter comprises a second pigment in an amount in the range of 12 mass% to 18 mass% with respect to the total mass of the tinter, the resin in an amount in the range of 50 mass% to 65 mass% with respect to the total mass of the tinter and the fluid medium in an amount in the range of 20 mass% to 35 mass% with respect to the total mass of said tinter.
In an embodiment of the present disclosure, the second pigment is selected from the group consisting of violet pigment, yellow oxide pigment, blue pigment and black pigment. In an exemplary embodiment, the second pigment is violet pigment.
In an exemplary embodiment, the tinter comprises a second pigment in an amount of 14.29 mass% with respect to the total mass of the tinter, the resin is present in an amount of 57.14 mass% with respect to the total mass of the tinter and the fluid medium in an amount of 28.57 mass% with respect to the total mass of said tinter.
In an embodiment of the present disclosure, the tinter is present in an amount in the range of 4 mass% to 8 mass% with respect to the total mass of the coating composition. In an exemplary embodiment, the tinter is present in an amount of 6 mass% with respect to the total mass of the coating composition.
In an exemplary embodiment, the tinter comprises 14.29 mass% of blue pigment, 57.14 mass% of glycerol-phthalic anhydride-fatty acid alkyd resin, and 28.57 mass% of methyl alcohol.
In an embodiment of the present disclosure, the fourth predetermined portion of the fluid medium is in the range of 30 mass% to 45 mass% with respect to the total mass of the fluid medium. In an exemplary embodiment, the fourth predetermined portion of the fluid medium is 36.71 mass% with respect to the total mass of the fluid medium.
In an embodiment of the present disclosure, the fourth predetermined speed is in the range of 600 rpm to 2000 rpm. In an exemplary embodiment, the fourth predetermined speed is 1000 rpm.
In an embodiment of the present disclosure, the fourth predetermined time period is in the range of 10 minutes to 20 minutes. In an exemplary embodiment, the fourth predetermined time period is 15 minutes.
In an embodiment of the present disclosure, the coating composition is applied on a mild steel oily barrel to obtain a film, wherein the film has a dry film thickness in the range of 15 µm to 25 µm.
In an exemplary embodiment, the film has a dry film thickness in the range of 18 µm to 20 µm.
By eliminating the pre-treatment zone and hot air-drying oven from the coating line, the overall energy consumption required to operate the system can be reduced by approximately 5% to 10%. The pre-treatment zone typically involves surface activation or cleaning steps, such as corona discharge, plasma treatment, chemical rinsing and the like, which require additional equipment and energy input for heating, fluid circulation, and exhaust management. Similarly, the hot air-drying oven consumes substantial energy to evaporate solvents or moisture from the coated substrate, relying on electric or gas heating and forced air systems. Hence, the process of coating the oily barrels with the HPST coating composition of the present disclosure is energy efficient. Further, the surface coated with the HPST coating of the present disclosure provides excellent chemical and water resistance and is hard and durable.
The foregoing description of the embodiments has been provided for purposes of illustration and not intended to limit the scope of the present disclosure. Individual components of a particular embodiment are generally not limited to that particular embodiment but are interchangeable. Such variations are not to be regarded as a departure from the present disclosure, and all such modifications are considered to be within the scope of the present disclosure.
The present disclosure is further described in light of the following experiments which are set forth for illustration purpose only and not to be construed for limiting the scope of the disclosure. The following experiments are scalable to industrial/commercial process.
EXPERIMENTAL DETAILS
Experiment 1: Process for the preparation of a high-performance stoving type (HPST) coating composition:
Example 1
Step 1: Preparation of the HPST coating composition
12 g of glycerol-phthalic anhydride-fatty acid alkyd resin (first predetermined portion of resin), 4 g of phthalocyanine blue pigment (first predetermined portion of a first pigment), 2 g of unsaturated fatty acid polyamide-phosphate ester salt (first predetermined portion of additive) and 1 g of heavy naphtha (C7-C11) (first predetermined portion of fluid medium) were mixed at 1000 rpm (first predetermined speed) for 10 minutes (first predetermined time period) to obtain a mixture.
4 g of glycerol-phthalic anhydride-fatty acid alkyd resin (second predetermined portion of resin), 0.6 g of a mixture of violet and red pigments (second predetermined portion of first pigment), 0.5 g of p-toluenesulfonic acid (PTSA) (second predetermined portion of additive), 3 g of barium sulphate (extender) and 1 g of heavy naphtha (C7-C11) (second predetermined portion of fluid medium) were added to the mixture and ground at 2500 rpm (second predetermined speed) for 60 minutes (second predetermined time period) to obtain a slurry.
35 g of glycerol-phthalic anhydride-fatty acid alkyd resin , 17 g of butyl ether-modified melamine-formaldehyde resin, 4 g of neopentyl glycol-adipic acid polyester polyol, and 3 g of pyrazole-blocked hexamethylene diisocyanate (HDI) trimer resin (combined third predetermined portion of resin), 0.5 g of polyether-modified polymethylalkyl siloxane (third predetermined portion of additive) were added to the slurry and mixed at 2000 rpm (third predetermined speed) for 10 minutes (third predetermined time period) to obtain a homogeneous mixture.
Separately, 1 g of blue pigment, 4 g of glycerol-phthalic anhydride-fatty acid alkyd resin and 2 g of methyl alcohol (fluid medium) were mixed to obtain a tinter. 6 g of the so obtained tinter and 1 g of butyl alcohol (fluid medium) were added to the homogeneous slurry followed by mixing at 1000 rpm (fourth predetermined speed) for 15 minutes (fourth predetermined time period) to obtain the HPST coating composition.
Step 2: Application of the HPST coating composition on an oily barrel
The HPST coating composition obtained in step 1 was applied to a mild steel oily barrel surface to obtain a film. The film was allowed to dry for 90 seconds. The dry film thickness was in the range of 18 µm to 20 µm. The barrel with the dry film was baked in an oven at a temperature of 170 ºC for 12 minutes followed by cooling at 25 ºC to obtain a coated surface. The final dry film thickness was in the range of 18 µm to 20 µm.
Examples 2 to 5
Examples 2 to 5 were prepared in a similar manner to Example 1, except with composition of the ingredients as disclosed in Table 1.
Examples 6 to 10
Examples 6 to 10 were prepared in a similar manner to Example 1, except with composition of the ingredients as disclosed in Table 2. 
Table 1: Coating composition of Examples 1 to 5
Resins (mass%) Pigments (mass%) Extenders (mass%) Additives (mass%) Tinter solution (mass%) Solvents (mass%)
Glycerol-phthalic anhydride-fatty acid alkyd resin Butyl ether-modified melamine-formaldehyde resin Neopentyl glycol-adipic acid polyester polyol resin pyrazole-blocked hexamethylene diisocyanate (HDI) trimer resin White Blue Red Violet Barium sulphate Micronized PTFE modified high density polyethylene wax unsaturated fatty acid polyamide-phosphate ester salt quaternary ammonium salt-modified hectorite clay p-toluenesulfonic acid (PTSA) Polyether-modified polymethylalkyl siloxane A mixture of Blue pigment, glycerol-phthalic anhydride-fatty acid alkyd resin and methyl alcohol Butyl alcohol Heavy naphtha (C7-C11)
Example 1 (Present Disclosure) 51 17 4 3 - 4 0.3 0.3 3 - 2.5 - 0.5 0.5 6 3 4.9
Example 2 (Present Disclosure)
51 18 3 3 1.6 4 0.3 0.2 3.5 0.5 1.8 1 0.2 0.7 7 3 2
Example 3 (Present Disclosure)
52 17 3 3 1.6 4 0.25 0.2 3.5 0.5 1.8 1 0.2 0.7 6.7 3 2
Example 4
(Comparative Example) 57 17 - - 1.2 2 0.1 0.3 - - 0.25 1 - 0.2 5 7 7
Example 5
(Comparative Example) 57 17.4 - - 1.2 2 0.1 0.2 - - 0.25 1 - 0.2 7 7 7

Table 2: Coating composition of Examples 6 to 10
Resins Additives Tinter solution Solvents
Amounts 52 mass% 17 mass% 3 mass % 3 mass % 0.5 mass % 1.8 mass % 1 mass % 0.2 mass % 0.7 mass % 6.7 mass % 3 mass % 2 mass %
Example 6 Pentaerythritol-phthalic anhydride- Short-oil Coconut alkyd resin Butylated hexamethyl melamine formaldehyde Neopentyl glycol-phthalic anhydride polyester polyol Pyrazole-blocked isophorone diisocyanate (IPDI) Micronized PTFE-modified oxidized polyethylene wax Maleated polyamide-acid ester salt Dimethyl dihydrogenated tallow ammonium-modified hectorite clay Methanesulfonic acid Mono-alkyl phosphate esters Violet pigment, glycerol-phthalic anhydride-fatty acid alkyd resin and butyl alcohol Methyl alcohol Benzene
Example 7
Soya fatty acid-based Medium-oil alkyd resin N,N′,N″-tris(butoxymethyl)melamine formaldehyde Ethylene glycol-adipic acid polyester polyol Pyrazole-blocked toluene diisocyanate (TDI) Ethylenediamine-adipic acid polyamide wax Sodium polyacrylate Quaternary ammonium-modified bentonite clay Dodecylbenzene sulfonic acid Di-alkyl phosphate esters Red pigment, glycerol-phthalic anhydride-fatty acid alkyd resin and butyl alcohol Methyl alcohol Toluene
Example 8
Glycerol-phthalic anhydride-medium-oil soya alkyd resin N,N′,N″,N‴,N⁗,N⁗′-hexakis(butoxymethyl)
melamine formaldehyde Neopentyl glycol-terephthalic acid hydroxyl-terminated polyester ε-caprolactam-blocked HDI biuret Hexamethylenediamine-sebacic acid polyamide wax Ammonium polyacrylate Organophilic montmorillonite clay Benzenesulfonic acid Polymeric phosphate esters White pigment, glycerol-phthalic anhydride-fatty acid alkyd resin and methyl alcohol Methyl alcohol Benzene
Example 9
Dehydrated castor oil-based short oil alkyd resin N,N′,N″,N‴,N⁗,N⁗′-hexakis(methoxymethyl)
melamine formaldehyde Adipic acid-neopentyl glycol carboxyl-terminated polyester Methyl ethyl ketoxime-blocked HDI trimer Micronized PTFE-modified high-density polyethylene wax Potassium polyacrylate Quaternary ammonium-modified synthetic hectorite Dimethyl ethanolamine phosphate Polyamine-modified polymer White pigment, glycerol-phthalic anhydride-fatty acid alkyd resin and methyl alcohol Butyl alcohol Toluene
Example 10
Pentaerythritol-phthalic anhydride- Medium oil Soya alkyd resin etherified hexamethylol melamine formaldehyde Maleic anhydride-propylene glycol unsaturated polyester n-Butanol-blocked HDI Micronized PTFE-modified high-density polyethylene wax Polyether-modified polyurethane dispersant Quaternary ammonium salt-modified hectorite clay Triethylamine phosphate Aminoalkyl silanes White pigment, glycerol-phthalic anhydride-fatty acid alkyd resin and methyl alcohol Butyl alcohol Toluene

Characterization studies
Mechanical Properties
The mechanical properties such as hardness, adhesion, scratch hardness, and impact resistance of the HPST coating composition of the present disclosure (Example 1 and Example 2) were tested against the coating composition of the Example 3 and Example 4. The results are summarized in Table 3.
Table 3: Mechanical Properties of the coating compositions of Example 1 to 4.
Hardness Adhesion Scratch hardness
(Gms) Impact resistance
Example 1 Pass, F* Passes (1 x 1 mm) 2000 Passes,
1 Kg/30 cm
Example 2 Pass, F* Passes (1 x 1 mm) 2000 Passes, 1 Kg/30 cm
Example 4 Pass, F* Passes (1 x 1 mm) 1500 Failed,
1 Kg/30 cm
Example 5 Pass, F* Passes (1 x 1 mm) 1500 Failed,
1 Kg/30 cm
*Hardness was evaluated by pencil hardness testing, wherein all examples passed at grade F
The scratch hardness test was carried out on coated surfaces of Example 1 and Example 2 using ASTMG171. Example demonstrates a scratch hardness of 2000 Gms, which is significantly higher than the 1500 Gms observed in the comparative examples (Example 4 and Example 5). The coated samples of Examples 1, 2, 4 and 5 were evaluated for impact resistance test. The coated samples of Examples 4 and 5 passed the impact resistance test at 500 g/30 cm, however failed the impact resistance at 1 Kg/30 cm. Whereas, the coated samples of Example 1 and 2 passed the impact resistance at 1 Kg/30 cm. This indicates that the HPST coating composition of the present disclosure offers enhanced resistance to mechanical abrasion and surface damage.
Chemical Resistance
The chemical resistance of the HPST coating composition of the present disclosure (Example 1 and 3) was tested against the coating composition of the Examples 4 and 5. The coated surfaces of all the examples were studied for MEK rub, salt spray test, acid/alkali resistance test. The coated surfaces of all the examples were also studied for water resistance studies. The results are summarized in Table 4.
Table 4: Results of chemical resistance tests
MEK Rub
Example 1 Passes,
200 double rubs
Example 3 Passes,
200 double rubs
Example 4 Failed,
200 double rubs
Example 5 Failed,
200 double rubs
The MEK rub test is a widely used method to evaluate the solvent resistance and cure completeness of a coating film using methyl ethyl ketone (MEK). The test was carried out on the coated surfaces of Example 1 and Example 3. Two cotton swabs were dipped in methyl ethyl ketone (MEK) and rubbed back and forth in a straight line over the coated surfaces of Examples 1 and 3. Both the examples passed 200 double rubs test.
Similar experiments were carried out on the coated surfaces of Example 4 and Example 5, which exhibits dullness, gloss reduction, and breaking after approximately 30 to 40 rubs. Whereas, the coated surface of Example 1 and Example 3 maintained these properties until 200 rubs, suggesting improved curing and chemical durability.
The coated surface of the Examples 1 to 3 and Examples 6 to 10 passed the humidity test at 72 hours. Further, the coated surface of the Example 1 and Example 3 passed the water resistance test, wherein the coated samples were dipped in water for 24 hours.
The water resistance test was carried out by dipping the coated surfaces obtained in Example 1 and Example 3 in water at a temperature in the range of 20 ºC to 40 ºC for 24 hours. Both the coated surfaces were dipped in water for 2 hours at room temperature after removal from water to stabilize the film, and then dried to allow surface moisture to evaporate, and avoid false negatives in adhesion. Adhesion was checked on both Examples (Examples 1 and 3) using Tape pull-off method on 1×1 mm crosshatch grid to assess film integrity (ASTM D3359). The hardness was checked for both the Examples (Examples 1 and 3) by application of nails. Both the Examples passed the adhesion and the nail hardness test. These results suggest that the HPST coating composition of the present disclosure is suitable for applications requiring high water resistance, such as metal drum coatings, appliance finishes, outdoor industrial surfaces and the like.
Thermal Properties
Film Thickness and Uniformity
The fineness of the grind was measured using Grinding H.G (ASTMD1210). The grinding H.G. values below 15 were observed, it is seen that the pigment dispersion is fine and uniform, with no coarse particles likely to degrade film smoothness or gloss. The dry film thickness was in the range of 18 µm to 20 µm, which is suitable for many industrial coating applications, especially for high-performance stoving-type (HPST) coatings on metal substrates like oily steel barrels.
Environmental Durability
Surface properties
The surface properties of the HPST coated surface of the present disclosure (Example 1) was compared with the coated surface of Example 4. The gloss measurements were carried out using a gloss meter (ASTMD523) at 60º angle. The observed value for both the samples were in the range of 82 units to 84 units, which were well above the acceptable lint of 80 units. The higher gloss value indicates a high-gloss finish, suitable for applications such as stoving enamels on steel barrels, automotive topcoats and appliance finishes.
TECHNICAL ADVANCEMENTS
The present disclosure described herein above has several technical advantages including, but not limited to, the realization of:
- a high-performance stoving type coating composition that
• is suitable for oily surfaces;
• provides excellent adhesion, hardness, and scratch resistance;
• provides good chemical resistance, and
- a process for the preparation of a high-performance stoving type coating composition, that is simple and economical.
The embodiments herein and the various features and advantageous details thereof are explained with reference to the non-limiting embodiments in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
The foregoing description of the specific embodiments so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.
Throughout this specification the word “comprise”, or variations such as “comprises” or “comprising”, will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.
The use of the expression “at least” or “at least one” suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the disclosure to achieve one or more of the desired objects or results.
Any discussion of documents, acts, materials, devices, articles or the like that has been included in this specification is solely for the purpose of providing a context for the disclosure. It is not to be taken as an admission that any or all of these matters form a part of the prior art base or were common general knowledge in the field relevant to the disclosure as it existed anywhere before the priority date of this application.
The numerical values mentioned for the various physical parameters, dimensions or quantities are only approximations and it is envisaged that the values higher/lower than the numerical values assigned to the parameters, dimensions or quantities fall within the scope of the disclosure, unless there is a statement in the specification specific to the contrary.
While considerable emphasis has been placed herein on the components and component parts of the preferred embodiments, it will be appreciated that many embodiments can be made and that many changes can be made in the preferred embodiments without departing from the principles of the disclosure. These and other changes in the preferred embodiment as well as other embodiments of the disclosure will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.
, Claims:WE CLAIM:
1. A high-performance stoving type coating composition comprising:
i. a resin in an amount in the range of 65 mass% to 85 mass% with respect to the total mass of said coating composition;
ii. a first pigment in an amount in the range of 1 mass% to 10 mass% with respect to the total mass of said coating composition;
iii. an extender in an amount in the range of 2 mass% to 7 mass% with respect to the total mass of said coating composition;
iv. an additive in an amount in the range of 2 mass% to 10 mass% with respect to the total mass of said coating composition;
v. a tinter in an amount in the range of 1 mass% to 10 mass% with respect to the total mass of said coating composition; and
vi. a fluid medium in an amount in the range of 2 mass% to 15 mass% with respect to the total mass of said coating composition.
2. The composition as claimed in claim 1, wherein said resin comprises an alkyd resin in an amount in the range of 65 mass% to 75 mass%, a melamine formaldehyde resin in an amount in the range of 20 mass% to 25 mass%, a polyester resin in an amount in the range of 3 mass% to 6 mass%, and a blocked isocyanate resin in an amount in the range of 2 mass% to 5 mass%, wherein the amount of each ingredient is with respect to the total mass of said resin.
3. The composition as claimed in claim 2, wherein
• said alkyd resin is at least one selected from the group consisting of glycerol-phthalic anhydride-fatty acid alkyd resin, pentaerythritol-phthalic anhydride- short-oil coconut alkyd resin, soya fatty acid-based medium-oil alkyd resin, glycerol-phthalic anhydride-medium-oil soya alkyd resin, dehydrated castor oil-based short oil alkyd resin, and pentaerythritol-phthalic anhydride- medium oil soya alkyd resin;
• said melamine formaldehyde resin is at least one selected from the group consisting of butyl ether-modified melamine-formaldehyde resin, butylated hexamethyl melamine formaldehyde resin, N,N′,N″-tris(butoxymethyl)melamine formaldehyde resin, N,N′,N″,N‴,N⁗,N⁗′-hexakis(butoxymethyl) melamine formaldehyde resin, N,N′,N″,N‴,N⁗,N⁗′-hexakis(methoxymethyl) melamine formaldehyde resin, and etherified hexamethylol melamine formaldehyde resin;
• said polyester resin is at least one selected from the group consisting of neopentyl glycol-adipic acid polyester polyol, neopentyl glycol-phthalic anhydride polyester polyol resin, ethylene glycol-adipic acid polyester polyol resin, neopentyl glycol-terephthalic acid hydroxyl-terminated polyester resin, adipic acid-neopentyl glycol carboxyl-terminated polyester resin, and maleic anhydride-propylene glycol unsaturated polyester resin;
• said blocked isocyanate resin is at least one selected from the group consisting of pyrazole-blocked hexamethylene diisocyanate (HDI) trimer resin, pyrazole-blocked isophorone diisocyanate (IPDI) resin, pyrazole-blocked toluene diisocyanate (TDI) resin, ε-caprolactam-blocked HDI biuret resin, methyl ethyl ketoxime-blocked HDI trimer resin, and n-Butanol-blocked HDI resin.
4. The composition as claimed in claim 1, wherein.
• said first pigment is at least one selected from the group consisting of white pigment, blue pigment, red pigment, and violet pigment;
• said extender is barium sulphate; and
• said additive is at least one selected from the group consisting of a wax additive, a wetting agent/dispersing agent, an anti-settling agent, an acid catalyst, and a surface tolerance agent.
5. The composition as claimed in claim 4, wherein
• said wax additive is at least one selected from micronized PTFE-modified high-density polyethylene wax, micronized PTFE-modified oxidized polyethylene wax, ethylenediamine-adipic acid polyamide wax, and hexamethylenediamine-sebacic acid polyamide wax;
• said wetting agent/dispersing agent is at least one selected from the group consisting of unsaturated fatty acid polyamide-phosphate ester salt, maleated polyamide-acid ester salt, sodium polyacrylate, ammonium polyacrylate, potassium polyacrylate, and polyether-modified polyurethane dispersant;
• said anti-settling agent is at least one selected from the group consisting of quaternary ammonium salt-modified hectorite clay, dimethyl dihydrogenated tallow ammonium-modified hectorite clay, quaternary ammonium-modified bentonite clay, organophilic montmorillonite clay, and quaternary ammonium-modified synthetic hectorite;
• said acid catalyst is at least one selected from the group consisting of p-toluenesulfonic acid (PTSA), methanesulfonic acid, dodecylbenzene sulfonic acid, benzenesulfonic acid, dimethyl ethanolamine phosphate, and triethylamine phosphate; and
• said surface tolerance agent is at least one selected from the group consisting of polyether-modified polymethylalkyl siloxane, mono-alkyl phosphate esters, di-alkyl phosphate esters, polymeric phosphate esters, polyamine-modified polymer, and aminoalkyl silanes.
6. The composition as claimed in claim 1, wherein said tinter comprises:
• a second pigment in an amount in the range of 12 mass% to 18 mass% with respect to the total mass of said tinter;
• said resin in an amount in the range of 50 mass% to 65 mass% with respect to the total mass of said tinter; and
• said fluid medium in an amount in the range of 20 mass% to 35 mass% with respect to the total mass of said tinter.
7. The composition as claimed in claim 6, wherein said second pigment is selected from the group consisting of violet pigment, yellow oxide pigment, blue pigment and black pigment.
8. The composition as claimed in claim 1, wherein said fluid medium is at least one selected from an alcohol and a hydrocarbon, wherein said alcohol is selected from methyl alcohol and butyl alcohol; and said hydrocarbon is selected from naphtha and an aromatic hydrocarbon.
9. The composition as claimed in claim 1, wherein said coating composition has:
• solid content in the range of 50 mass% to 60 mass%; and
• viscosity in the range of 55 seconds to 65 seconds, measured by using a cup B4 at 30 °C.
10. The composition as claimed in claim 1, wherein said coating composition is applied on a mild steel oily barrel to obtain a film, wherein said film has a dry film thickness in the range of 15 µm to 25 µm.
11. A process for the preparation of a high-performance stoving type coating composition, said process comprising the following steps:
a. mixing first predetermined portions of a resin, a first pigment, an additive, and a fluid medium at a first predetermined speed for a first predetermined time period to obtain a mixture;
b. adding a predetermined amount of an extender and second predetermined portions of said resin, said first pigment, said additive, and said fluid medium to said mixture followed by grinding at a second predetermined speed for a second predetermined time period to obtain a slurry;
c. adding third predetermined portions of said resin, said additive and said fluid medium to said slurry at a third predetermined speed for a third predetermined time period to obtain a homogeneous slurry; and
d. adding a predetermined amount of a tinter and a fourth predetermined portion of said fluid medium to said homogeneous slurry followed by mixing at a fourth predetermined speed for a fourth predetermined time period to obtain said coating composition.
12. The process as claimed in claim 11, wherein said resin comprises an alkyd resin in an amount in the range of 65 mass% to 75 mass%, a melamine formaldehyde resin in an amount in the range of 20 mass% to 25 mass%, a polyester resin in an amount in the range of 3 mass% to 6 mass%, and a blocked isocyanate resin in an amount in the range of 2 mass% to 5 mass%, wherein the amount of each ingredient is with respect to the total mass of said resin.
13. The process as claimed in claim 12, wherein
• said alkyd resin is at least one selected from the group consisting of glycerol-phthalic anhydride-fatty acid alkyd resin, pentaerythritol-phthalic anhydride- short-oil coconut alkyd resin, soya fatty acid-based medium-oil alkyd resin, glycerol-phthalic anhydride-medium-oil soya alkyd resin, dehydrated castor oil-based short oil alkyd resin, and pentaerythritol-phthalic anhydride- medium oil soya alkyd resin;
• said melamine formaldehyde resin is at least one selected from the group consisting of butyl ether-modified melamine-formaldehyde resin, butylated hexamethyl melamine formaldehyde resin, N,N′,N″-tris(butoxymethyl)melamine formaldehyde resin, N,N′,N″,N‴,N⁗,N⁗′-hexakis(butoxymethyl) melamine formaldehyde resin, N,N′,N″,N‴,N⁗,N⁗′-hexakis(methoxymethyl) melamine formaldehyde resin, and etherified hexamethylol melamine formaldehyde resin;
• said polyester resin is at least one selected from the group consisting of neopentyl glycol-adipic acid polyester polyol resin, neopentyl glycol-phthalic anhydride polyester polyol resin, ethylene glycol-adipic acid polyester polyol resin, neopentyl glycol-terephthalic acid hydroxyl-terminated polyester resin, adipic acid-neopentyl glycol carboxyl-terminated polyester resin, and maleic anhydride-propylene glycol unsaturated polyester resin;
• said blocked isocyanate resin is at least one selected from the group consisting of pyrazole-blocked hexamethylene diisocyanate (HDI) trimer resin, pyrazole-blocked isophorone diisocyanate (IPDI) resin, pyrazole-blocked toluene diisocyanate (TDI) resin, ε-caprolactam-blocked HDI biuret resin, methyl ethyl ketoxime-blocked HDI trimer resin, and n-Butanol-blocked HDI resin.
14. The process as claimed in claim 11, wherein
• said first pigment is at least one selected from the group consisting of white pigment, blue pigment, red pigment, and violet pigment; and
• said extender is barium sulphate.
15. The process as claimed in claim 11, wherein said additive is at least one selected from the group consisting of a wax additive, a wetting agent/dispersing agent, anti-settling agent, an acid catalyst, and surface tolerance agents.
16. The process as claimed in claim 15, wherein
• said wax additive is at least one selected from micronized PTFE-modified high-density polyethylene wax, micronized PTFE-modified oxidized polyethylene wax, ethylenediamine-adipic acid polyamide wax, and hexamethylenediamine-sebacic acid polyamide wax;
• said wetting agent/dispersing agent is at least one selected from the group consisting of unsaturated fatty acid polyamide-phosphate ester salt, maleated polyamide-acid ester salt, sodium polyacrylate, ammonium polyacrylate, potassium polyacrylate, and polyether-modified polyurethane dispersant;
• said anti-settling agent is at least one selected from the group consisting of quaternary ammonium salt-modified hectorite clay, dimethyl dihydrogenated tallow ammonium-modified hectorite clay, quaternary ammonium-modified bentonite clay, organophilic montmorillonite clay, and quaternary ammonium-modified synthetic hectorite;
• said acid catalyst is at least one selected from the group consisting of p-toluenesulfonic acid (PTSA), methanesulfonic acid, dodecylbenzene sulfonic acid, benzenesulfonic acid, dimethyl ethanolamine phosphate, and triethylamine phosphate; and
• said surface tolerance agent is at least one selected from the group consisting of polyether-modified polymethylalkyl siloxane, mono-alkyl phosphate esters, di-alkyl phosphate esters, polymeric phosphate esters, polyamine-modified polymer, and aminoalkyl silanes.
17. The process as claimed in claim 11, wherein said tinter comprises:
• a second pigment in an amount in the range of 12 mass% to 18 mass% with respect to the total mass of said tinter;
• said resin in an amount in the range of 50 mass% to 65 mass% with respect to the total mass of said tinter; and
• said fluid medium in an amount in the range of 20 mass% to 35 mass% with respect to the total mass of said tinter.
18. The process as claimed in claim 17, wherein said second pigment is selected from the group consisting of violet pigment, yellow oxide pigment, blue pigment and black pigment.
19. The process as claimed in claim 11, wherein said fluid medium is at least one selected from an alcohol and a hydrocarbon, wherein said alcohol is selected from methyl alcohol and butyl alcohol; and said hydrocarbon is selected from naphtha and aromatic hydrocarbons.
20. The process as claimed in claim 11, wherein
• said resin is present in an amount in the range of 65 mass% to 85 mass% with respect to the total mass of said coating composition;
• said first pigment is present in an amount in the range of 1 mass% to 10 mass% with respect to the total mass of said coating composition;
• said extender is present in an amount in the range of 2 mass% to 7 mass% with respect to the total mass of said coating composition;
• said additive is present in an amount in the range of 2 mass% to 7 mass% with respect to the total mass of said coating composition;
• said tinter is present in an amount in the range of 4 mass% to 8 mass% with respect to the total mass of said coating composition; and
• said fluid medium is present in an amount in the range of 5 mass% to 15 mass% with respect to the total mass of said coating composition.
21. The process as claimed in claim 11, wherein
• said first predetermined portion of said resin is in the range of 12 mass% to 20 mass% with respect to the total mass of said resin; said second predetermined portion of said resin is in the range of 3 mass% to 10 mass% with respect to the total mass of said resin and said third predetermined portion of said resin is in the range of 70 mass% to 85 mass% with respect to the total mass of said resin; and
• said first predetermined portion of said first pigment is in the range of 80 mass% to 90 mass% with respect to the total mass of said first pigment and said second predetermined portion of said first pigment is in the range of 10 mass% to 20 mass% with respect to the total mass of said first pigment.
22. The process as claimed in claim 11, wherein said first predetermined portion of said additive is in the range of 50 mass% to 65 mass% with respect to the total mass of said additive, said second predetermined portion of said additive is in the range of 10 mass% to 20 mass% with respect to the total mass of said additive, and said third predetermined portion of said additive is in the range of 20 mass% to 35 mass% with respect to the total mass of said additive.
23. The process as claimed in claim 11, wherein said first predetermined portion of said fluid medium is in the range of 5 mass% to 20 mass% with respect to the total mass of said fluid medium, said second predetermined portion of said fluid medium is in the range of 5 mass% to 20 mass% with respect to the total mass of said fluid medium, said third predetermined portion of said fluid medium is in the range of 30 mass% to 45 mass% with respect to the total mass of said fluid medium, and said fourth predetermined portion of said fluid medium is in the range of 30 mass% to 45 mass% with respect to the total mass of said fluid medium.
24. The process as claimed in claim 11, wherein
• said first predetermined speed is in the range of 600 rpm to 1500 rpm;
• said second predetermined speed is in the range of 2000 rpm to 3000 rpm;
• said third predetermined speed is in the range of 1500 rpm to 3000 rpm; and
• said fourth predetermined speed is in the range of 600 rpm to 2000 rpm.
25. The process as claimed in claim 11, wherein
• said first predetermined time period is in the range of 5 minutes to 20 minutes;
• said second predetermined time period is in the range of 30 minutes to 90 minutes;
• said third predetermined time period is in the range of 5 minutes to 20 minutes; and
• said fourth predetermined time period is in the range of 10 minutes to 20 minutes.

Dated this 26th day of February, 2026

_______________________________
MOHAN RAJKUMAR DEWAN, IN/PA – 25
OF R. K. DEWAN & CO.
AUTHORIZED AGENT OF APPLICANT
TO,
THE CONTROLLER OF PATENTS
THE PATENT OFFICE, MUMBAI