DESC:FIELD OF INVENTION
The present invention relates to polyurethane and polyurethane-urea polymer, aqueous dispersion of the same and coating formulations for high-performance coating, adhesive and sealants.
BACKGROUND ART
Aqueous polyurethane dispersions are widely used in coatings, adhesives, sealants and printing inks. The formulation of aqueous polyurethane dispersions involves many components namely, polyols, isocyanates, chain extension agents, and ionic groups, salt forming material which enable the polyurethane to be dispersed in water. During aqueous polyurethane-urea synthesis the prepolymer generally has higher viscosity due to higher molecular weight development. Due to higher viscosity to disperse above prepolymer in water is very difficult and always need water compatible solvent such as acetone, MEK, NMP etc. Later striping of this solvent is a tedious task in bulk stage production. In prior art for viscosity reduction of prepolymer use of acrylic monomer is also reported but it also needs one more step of emulsion polymerization and hence more time consuming. Also, single design of aqueous polyurethane-urea which provide balanced properties like % elongation, tensile strength, water resistance, toughness etc. in coating is still not available in prior art.
In prior art domain, US10676562B2, JP5813947B2, CN107417873B, JP4028059B2, WO2022198046A1 such various prior inventions reported solventless method but some has used solvent at later stage or some has dispersed prepolymer at higher temperature which form excess urea bond, which all leads to poor water resistance of coating.
On this reference is drawn to US10676562B2: Process for preparing solvent-free aqueous polyurethane dispersion modified with acrylic grafting instead of acetone to obtain a solvent-free aqueous polyurethane dispersion.
JP5813947B2 on solvent-free aqueous polyurethane dispersion and method for producing and using the same is directed to isocyanate-terminated pre-polymer that is substantially solvent-free for use in an aqueous polyurethane dispersion that is stable or solvent-free comprising less than 10% organic solvent or no organic solvent on a total weight percentage basis means for higher solid i.e. more than 20% solid solvent is must require.
CN107417873B on aqueous polyurethane dispersion and solvent-free preparation method thereof: Although this prior invention does not mention solvent use but in process initially added some amount of water between 60-90 deg C which differently form huge amount of NCO and water based urea molecule and such urea molecule create very poor water resistance in coatings. Also this prior invention involved sulfonate type polyamine hydrophilic chain extender. For longer stability this sulfonate type polyamine is required in high amount which reflect again in poor water resistance and use of polyurethane dispersion in large scale is difficult.
JP4028059B2 teaching co-solvent-free aqueous anionic polyurethane dispersion and its use as peelable coating although made with chain termination process where molecular weight development is very less mentions organic solvent involvement during chain extension that is later distilled out.
WO2022198046A1 disclosing aqueous polyurethane dispersion initially added some amount of water between 60-90 deg C which differently formed huge amount of NCO and water based urea molecule and such urea molecule create very poor water resistance in coatings.
Hence, to circumvent the above issue there is requirement of polyurethane and polyurethane-urea polymer and aqueous dispersions of the same having molecular weight range in select levels so that high performance can be achieved by involving minimum amount of hydrophilic ionic group and solvents for viscosity adjustment before and after dispersion in water, that would provide balanced properties including % elongation, tensile strength, water resistance, toughness etc. in coating applications.

OBJECTS OF THE INVENTION
The basic object of the present invention is to provide polyurethane and polyurethane-urea polymer and aqueous dispersions of the same and coating formulations thereof which in being free of solvent would aid in eliminating the hazards like low flash point due to conventional involvement of solvent during processing of aqueous polyurethane dispersion.
It is another object of the present invention to provide for polyurethane and polyurethane-urea polymer and aqueous dispersions of the same and coating formulations thereof which polyurethane-urea in involving select molecular wt. range together with urea bonds would enable balanced % elongation, tensile strength, and crack bridging ability in coatings.
It is yet another object of the present invention to provide for polyurethane and polyurethane-urea polymer with select ionized group such that particle size distribution of the water dispersion is in select lower levels to build coating with good water resistance.
It is another object of the present invention to provide for polyurethane and polyurethane-urea polymer and aqueous dispersions of the same with almost negligible NCO-water based urea bond to help in building coatings with good water resistance.
It is still another object of the present invention to provide polyurethane and polyurethane-urea polymer and aqueous dispersion of the same and coating formulation thereof which in being free of organic solvents would provide for good compatibility with acrylic and styrene acrylic emulsion, or any other water-based polymer.

SUMMARY OF THE INVENTION

Thus according to the basic aspect of the present invention there is provided a polyurethane and polyurethane-urea polymer, aqueous dispersion of the same and coating formulations thereof wherein the polyurethane and polyurethane-urea composition comprise
component (I) NCO terminated prepolymer of 1.5–8% NCO content and 100% solid;
component (II) as a synergistic combination of at least one AB2 or AB3 or A2B2 compound type, and, one (-R-)n-(NH2-1-)m compound to react with pre-polymer of component (I).
Preferably a polyurethane and polyurethane-urea polymer is provided wherein said (II) includes the variants:
II (i) Amount of compound involved is based on pre-polymer % NCO content of (I) towards 100 percentage consumption of free NCO;
II (ii) AB2 or AB3 or A2B2 type compound comprising at least two NCO-reactive groups and at least one ionic group;
II (iii) Ratio of AB2 or AB3 or A2B2 type compound and said synergistic combination with one (-R-)n-(NH2-1-)m compound is in the range of 90:10 to 70:30 for reacting with moiety ‘B’ of said AB2 or AB3 or A2B2 type compound;
II (iv) in said (-R-)n-(NH2-1-)m where ‘R’ moiety is either ethylene or propylene or butylene or Isophorone group and integer ‘n’ is in the range of 1-4, -NH2-1 is moiety is either primary or secondary or mix of primary and secondary amine and integer ‘m’ is in the range of 1-4.
According to another preferred aspect of the present invention there is provided said polyurethane and polyurethane-urea polymer wherein aqueous dispersion of the same is neutralized through tertiary amine, and, in said component (II) the B moiety has NCO-reactive groups preferably a hydroxyl group and A moiety preferably represents ionic group which is carboxyl group, with the weight percentage of AB2 or AB3 or A2B2 compound is such that the total acid value of the polyurethane-urea polymer after reaction of component (II) with NCO terminated pre-polymer of component (I), is between 10-25 mg KOH/gm.
Preferably said polyurethane and polyurethane-urea polymer is provided wherein said NCO terminated pre-polymer component (I) comprises:
(i) at least one polyol component having a functionality of 2 to 4 including Polypropylene Glycol 2000;
(ii) at least one diisocyanate component including Isophorone Disocyanate;
(iii) ratio of polyol and diisocyanate component is in the range of 1:1.25 to 1: 2.5.
According to another preferred aspect of polyurethane and polyurethane-urea polymer wherein in said polyurethane and polyurethane-urea dispersions said component (II) is based on the following:
said AB2 type compounds including Dimethylol Propionic acid, Dimethylol butanoic acid, Adduct of trimethylol propane and maleic anhydride, Adduct of trimethylol propane and phthalic anhydride, Adduct of glycerol and maleic anhydride, adduct of glycerol and phthalic anhydride;
said AB3 and A2B2 type compounds including adduct of pentaerythritol and maleic anhydride and pentaerythritol and phthalic anhydride in select mole ratios of 2: 1.
According to another aspect of the present invention there is provided a process for manufacturing said polyurethane and polyurethane-urea polymer and aqueous dispersion of the same and coating formulations thereof comprising the steps of

a) providing said pre-polymer component (I);
b) providing said component (II);
c) reacting components (I) and (II) to provide for polyurethane-urea polymer with ionic groups;
d) neutralizing the ionic group with tertiary amine to 70–100% neutralization of ionic groups and obtaining therefrom a stable dispersion with particle size between 60–200 nm;
e) adding water to obtain an aqueous dispersion of polyurethane-urea polymer at the solid level of 30-45% with the molecular wt. of the polymer in the range of 10000–30000 Dalton.
Preferably in said process for manufacturing said polyurethane and polyurethane-urea polymer and aqueous dispersion wherein
said process is carried out free of organic solvents;
said prepolymer component (I) is attained at temperatures between 60–110 deg. C in presence of catalyst including Dibutyltin Dilaurate.
said reaction temperature for reaction between pre-polymer (I) and component (II) is selective between 60-90 deg C;
said neutralization with tertiary amine is selectively carried out in between 40–60 deg. C;
said adding water to enable a water dispersion of the thus attained polyurethane and polyurethane-urea dispersions is performed in the selective temperature range of 20-40 deg. C.

DETAILED DESCRIPTION OF THE INVENTION
As discussed hereinbefore, the present invention relates to polyurethane and polyurethane-urea polymer, aqueous dispersion of the same and coating formulations thereof wherein the polyurethane and polyurethane-urea composition comprises
component (I) NCO terminated prepolymer of 1.5–8% NCO content and 100% solid;
component (II) as a synergistic combination of at least one AB2 or AB3 or A2B2 type compound and mix of any two or mix of all three, and, one (-R-)n-(NH2-1-)m compound to react with pre-polymer component (I).
said component (II) includes the variants of
(II) (i) Amount of compound involved is based on pre-polymer % NCO content of (I) towards 100 percentage consumption of free NCO;
(II) (ii) AB2 or AB3 or A2B2 type compound comprising at least two NCO-reactive groups and at least one ionic group;
(II) (iii) Ratio of AB2 or AB3 or A2B2 type compound and said synergistic combination with one (-R-)n-(NH2-1-)m compound is in the range of 90: 10 to 70: 30 for reacting with moiety ‘B’ of said AB2 or AB3 or A2B2 type compound;
(II) (iv) in said (-R-)n-(NH2-1-)m where ‘R’ moiety is either ethylene or propylene or butylene or Isophorone group and integer ‘n’ is in the range of 1-4, -NH2-1 is either primary or secondary or mix of primary and secondary amine and integer ‘m’ is in the range of 1-4.
Preferably in said component (II), said B moiety represents NCO-reactive groups which is preferably a hydroxyl group and A moiety preferably represents ionic group which is carboxyl group, with the weight percentage of AB2 or AB3 or A2B2 compound is as described above and is such that the total acid value of the polyurethane-urea polymer i.e. after reaction of component (II) with NCO terminated pre-polymer of component (I), is between 10-25 mg KOH/gm only.
According to an aspect of the present invention wherein said NCO terminated pre-polymer component (A) comprises:
(i) at least one polyol component having a functionality of 2 to 4.
(ii) at least one diisocyanate component.
(iii) ratio of polyol and diisocyanate component is in the range of 1: 1.25 to 1: 2.5
According to yet another aspect of the present invention there is provided said polyurethane and polyurethane-urea dispersions wherein said component (II) including AB2 type compounds include Dimethyl Propionic acid, Dimethyl butanoic acid, adduct of trimethylol propane and maleic anhydride, Adduct of trimethylol propane and phthalic anhydride, Adduct of glycerol and maleic anhydride, adduct of glycerol and phthalic anhydride etc. Example of AB3 and A2B2 compounds are adduct of pentaerythritol and maleic anhydride and pentaerythritol and phthalic anhydride in different mole ratio.
According to another aspect of the present invention there is provided a process for manufacturing said polyurethane and polyurethane-urea dispersions, aqueous dispersion of the same and coating formulations thereof comprising the steps of
a) providing said pre-polymer component (I);
b) providing said component (II);
c) reacting components, (I) and (II) to provide for polyurethane-urea polymer with ionic groups;
d) neutralizing the ionic group with tertiary amine to neutralize 70–100% ionic groups and obtaining therefrom a stable dispersion and particle size of dispersion between 60–200 nm.
e) adding water to obtain an aqueous dispersion of polyurethane-urea polymer at the solid level of 30-45% with the molecular wt. of the polymer in the range of 10000–30000 Dalton.
Preferably in said process the same is carried out free of organic solvents.

More preferably the process reaction temperature to obtain the pre-polymer is selective to be between 60–110 deg. C.
According to yet another preferred aspect the reaction temperature for reaction between pre-polymer (I) and component (II) is also selective between 60-90 deg C.
According to yet another preferred aspect of the process of the present invention the neutralization with tertiary amine is selectively carried out in between 40–60 deg. C, and adding water to enable a water dispersion of the thus attained polyurethane and polyurethane-urea dispersions is done in the selective temperature range of 20-40 deg. C.
Polyurethane and polyurethane-urea polymer, aqueous dispersion of the same and physical and mechanical properties of coating formulations thereof have been tested wherein the polyurethane and polyurethane-urea polymer formulation comprises component (I) NCO terminated pre-polymer of 1.5–8% NCO content and 100% solid; component (II) as a synergistic combination of at least one AB2 or AB3 or A2B2 type compound and mix of any two or mix of all three, and, one (-R-)n-(NH2-1-)m compound to react with pre-polymer component (I), enabling a binder favoring high-performance coating, adhesive and sealants.

EXAMPLES:
Table I: Formulation of polyurethane dispersion

Ingredients Ex 1 Ex 2 Ex 3 Ex 4 Ex 5 Ex 6 Comp 1
Polypropylene glycol 2000 23 23 23 23 23 23 23
Isophorone Disocyanate 10 10 10 10 10 10 10
Dibutyltin Dilaurate 0.05 0.05 0.05 0.05 0.05 0.05 0.05
DMPA (AB2) 2 1.5 1 1 1.8#
*TMP – MA adduct (AB3) 1 1.5
Penta-MA adduct (A2B2) 1 1.5
Triethyl amine 0.8 0.8 1 1 0.8 0.8 0.8
Ethylene Diamine 0.8 1.2 1.2 1.2 1.6 1.6 1
Silicone free defoamers 0.5 0.5 0.5 0.5 0.5 0.5 0.5
DM Water 62.85 62.95 62.25 62.25 62.55 62.55 62.85
Total 100 100 1001 100 100 100 100

* Trimethylol propane-Maleic anhydride adduct (AB3) and Pentaerythritol-Maleic anhydride adduct (A2B2): Prepared separately in 2: 1 mole ratio in O-Xylene solvent using DTBP catalyst at 130° C followed by stripping of O-Xylene and mixed with polypropylene Glycol 2000;

#Taken initially in pre-polymer synthesis:

Example 1

23g of polypropylene glycol of molecular weight 2000 and hydroxyl value of 56 was charge in a reactor fitted with condenser, dropping funnel, thermometer, stirrer and nitrogen flow set up. 10g of Isophorone Diisocyanate was added into the reactor followed by 0.05g of Dibutyl dilaurate as a catalyst under constant stirring. Nitrogen purging was started and slowly raised the reactor temp to 70°C. After two hour of reaction removed sample and check % NCO content as per back titration method. When required % NCO achieved at this stage then added 2g of Dimethylol propionic acid into the NCO – terminated prepolymer and raised temp to 90° C. Stirred reaction for another two hours and again checked %NCO content. If required %NCO content of this design achieved (less than 8%) then started cooling the reactor to 50° C. At 50°C added neutralizer triethyl amine and stir for another 45 mins. Then again cooled the reactor to 30°C. At 30°C addition of demineralized water started under vigorous stirring to disperse the prepolymer in water. After getting dispersion started addition of 30% solution of required amount of ethylene diamine in demineralized water and addition to be completed in one hours. Checked the batch against specification.

Example 2

23g of polypropylene glycol of molecular weight 2000 and hydroxyl value of 56 was charge in a reactor fitted with condenser, dropping funnel, thermometer, stirrer and nitrogen flow set up. 10g of Isophorone Diisocyante was added into the reactor followed 0.05g of Dibutyl dilaurate as a catalyst under constant stirring. Nitrogen purging was started and slowly raised the reactor temp to 70°C. After two hour of reaction removed sample and check % NCO content as per back titration method. When required % NCO achieved then added 1.5g of Dimethylol propionic acid into the NCO – terminated prepolymer and raised temp to 90° C. Stirred reaction for another two hours and again checked %NCO content. If required %NCO content of this design achieved (less than 8%) then started cooling the reactor to 50° C. At 50°C added neutralizer triethyl amine and stir for another 45 mins. Then again cooled the reactor to 30°C. At 30°C addition of demineralized water started under vigorous stirring to disperse the prepolymer in water. After getting dispersion started addition of 30% solution of required amount of ethylene diamine in demineralized water and addition to be completed in one hours. Checked the batch against specification.

Example 3

18g of polypropylene glycol of molecular weight 2000 and hydroxyl value of 56 was charge in a reactor fitted with condenser, dropping funnel, thermometer, stirrer and nitrogen flow set up. Preheated 1g TMP-MA adduct premixed with 5g Polypropylene glycol was added and stirred for 10 minutes. Then 10g of Isophorone Diisocyante was added into the reactor followed 0.05g of Dibutyl dilaurate as a catalyst under constant stirring. Nitrogen purging was started and slowly raised the reactor temp to 70°C. After two hour of reaction removed sample and check % NCO content as per back titration method. When required % NCO achieved then added 1g of Dimethylol propionic acid into the NCO – terminated prepolymer and raised temp to 90° C. Stirred reaction for another two hours and again checked %NCO content If required %NCO content of this design achieved (less than 8%) then started cooling the reactor to 50° C. At 50°C added neutralizer triethyl amine and stir for another 45 mins. Then again cooled the reactor to 30°C. At 30°C addition of demineralized water started under vigorous stirring to disperse the prepolymer in water. After getting dispersion started addition of 30% solution of required amount of ethylene diamine in demineralized water and addition to be completed in one hours. Checked the batch against specification.

Example 4

18g of polypropylene glycol of molecular weight 2000 and hydroxyl value of 56 was charge in a reactor fitted with condenser, dropping funnel, thermometer, stirrer and nitrogen flow set up. Preheated 1g Penta-MA adduct premixed with 5g Polypropylene glycol was added and stirred for 10 minutes. Then 10g of Isophorone Diisocyante was added into the reactor followed 0.05g of Dibutyl dilaurate as a catalyst under constant stirring. Nitrogen purging was started and slowly raised the reactor temp to 70°C. After two hour of reaction removed sample and check % NCO content as per back titration method. When required % NCO achieved then added 1g of Dimethylol propionic acid into the NCO – terminated prepolymer and raised temp to 90° C. Stirred reaction for another two hours and again checked %NCO content. If required %NCO content of this design achieved (less than 8%) then started cooling the reactor to 50° C. At 50°C added neutralizer triethyl amine and stir for another 45 mins. Then again cooled the reactor to 30°C. At 30°C addition of demineralized water started under vigorous stirring to disperse the prepolymer in water. After getting dispersion started addition of 30% solution of required amount of ethylene diamine in demineralized water and addition to be completed in one hours. Checked the batch against specification.

Example 5

18g of polypropylene glycol of molecular weight 2000 and hydroxyl value of 56 was charge in a reactor fitted with condenser, dropping funnel, thermometer, stirrer and nitrogen flow set up. Preheated 1.5g TMP-MA adduct premixed with 5g Polypropylene glycol was added and stirred for 10 minutes. Then 10g of Isophorone Diisocyante was added into the reactor followed 0.05g of Dibutyl dilaurate as a catalyst under constant stirring. Nitrogen purging was started and slowly raised the reactor temp to 70°C. After four hour of reaction removed sample and check % NCO content as per back titration method. When required % NCO achieved ( less then 8% ) then started cooling the reactor to 50° C. At 50°C added neutralizer triethyl amine and stir for another 45 mins. Then again cooled the reactor to 30°C. At 30°C addition of demineralized water started under vigorous stirring to disperse the prepolymer in water. After getting dispersion started addition of 30% solution of ethylene diamine in demineralized water and addition to be completed in one hours. Checked the batch against specification.

Example 6

18g of polypropylene glycol of molecular weight 2000 and hydroxyl value of 56 was charge in a reactor fitted with condenser, dropping funnel, thermometer, stirrer and nitrogen flow set up. Preheated 1.5g Penta-MA adduct premixed with 5g Polypropylene glycol was added and stirred for 10 minutes. Then 10g of Isophorone Diisocyante was added into the reactor followed 0.05g of Dibutyl dilaurate as a catalyst under constant stirring. Nitrogen purging was started and slowly raised the reactor temp to 70°C. After four hour of reaction removed sample and check % NCO content as per back titration method. When required % NCO for this design achieved (less than 8%) then started cooling the reactor to 50° C. At 50°C added neutralizer triethyl amine and stir for another 45 mins. Then again cooled the reactor to 30°C. At 30°C addition of demineralized water started under vigorous stirring to disperse the prepolymer in water. After getting dispersion started addition of 30% solution of required amount of ethylene diamine in demineralized water and addition to be completed in one hours. Checked the batch against specification.

Comparative 1

23g of polypropylene glycol of molecular weight 2000 and hydroxyl value of 56 was charge in a reactor fitted with condenser, dropping funnel, thermometer, stirrer and nitrogen flow set up. 1.8g Dimethylol propionic acid was added and stirred for 10 minutes. Then 10g of Isophorone Diisocyante was added into the reactor followed 0.05g of Dibutyl dilaurate as a catalyst under constant stirring. Nitrogen purging was started and slowly raised the reactor temp to 70°C. After four hour of reaction removed sample and check % NCO content as per back titration method. When required % NCO for this design achieved (less than 8%) then started cooling the reactor to 50° C. At 50°C added neutralizer triethyl amine and stir for another 45 mins. Then again cooled the reactor to 30°C. At 30°C addition of demineralized water started under vigorous stirring to disperse the prepolymer in water. After getting dispersion started addition of 30% solution of required amount of ethylene diamine in demineralized water and addition to be completed in one hours. Checked the batch against specification.

Table 2: Physical and mechanical properties

Parameters Spec/ Test methods Ex 1 Ex 2 Ex 3 Ex 4 Ex 5 Ex 6 Comp 1
Appearance Visual Milky white Bluish white (Translucent) Bluish white (Translucent) Milky white Bluish white (Translucent) Milky white Milky white
Viscosity (gm) 60- 100 gm (Stormer viscometer) 85 60 68 76 64 90 76
%Solid 33-35% (120° C for one hour) 35.5 35.9 35.7 35.2 34.5 35.5 34.8
pH (PH meter) 7.5 - 9 8.5 8.8 7.9 8.5 8.9 7.8 8
Particle Size (Malvern 3000) 60-150 nm 180 90 80 165 140 170 190
Acid Value (Theoretical) NA 25 18 15 21 20 20 22
Drying time In Minutes (ASTM D 1640) 25 15 18 25 20 35 35
Water resistance 30 days (ASTM D 870) 25 days 30 days 30 days 25 days 30 days 20 days 12 days
Tensile strength (MPa) (ASTM 2370) 10 MPa 14 MPa 13 MPa 9 MPa 7 MPa 8 MPa 9 MPa
%Elongation (ASTM 2370) 1400 1800 2100 1300 1200 1250 800

Advantageously, it is thus possible by way of the present invention to provide for said aqueous polyurethane and polyurethane-urea dispersion that shows water resistance, good tensile strength, and % elongation to favour coating formulations which in being water based is also compatible with water based acrylic or styrene acrylic emulsion.
,CLAIMS:We Claim:

1. A polyurethane and polyurethane-urea polymer, aqueous dispersion of the same and coating formulations thereof wherein the polyurethane and polyurethane-urea composition comprise
component (I) NCO terminated prepolymer of 1.5–8% NCO content and 100% solid;
component (II) as a synergistic combination of at least one AB2 or AB3 or A2B2 compound type, and, one (-R-)n-(NH2-1-)m compound to react with pre-polymer of component (I).

2. The polyurethane and polyurethane-urea polymer as claimed in claim 1 wherein said (II) includes the variants:
II (i) Amount of compound involved is based on pre-polymer % NCO content of (I) towards 100 percentage consumption of free NCO;
II (ii) AB2 or AB3 or A2B2 type compound comprising at least two NCO-reactive groups and at least one ionic group;
II (iii) Ratio of AB2 or AB3 or A2B2 type compound and said synergistic combination with one (-R-)n-(NH2-1-)m compound is in the range of 90:10 to 70:30 for reacting with moiety ‘B’ of said AB2 or AB3 or A2B2 type compound;
II (iv) in said (-R-)n-(NH2-1-)m where ‘R’ moiety is either ethylene or propylene or butylene or Isophorone group and integer ‘n’ is in the range of 1-4, -NH2-1 is moiety is either primary or secondary or mix of primary and secondary amine and integer ‘m’ is in the range of 1-4.
3. The polyurethane and polyurethane-urea polymer as claimed in claims 1 or 2 wherein aqueous dispersion of the same is neutralized through tertiary amine, and, in said component (II) the B moiety has NCO-reactive groups preferably a hydroxyl group and A moiety preferably represents ionic group which is carboxyl group, with the weight percentage of AB2 or AB3 or A2B2 compound is such that the total acid value of the polyurethane-urea polymer after reaction of component (II) with NCO terminated pre-polymer of component (I), is between 10-25 mg KOH/gm.
4. The polyurethane and polyurethane-urea polymer as claimed in claims 1-3 wherein said NCO terminated pre-polymer component (I) comprises:
(i) at least one polyol component having a functionality of 2 to 4 including Polypropylene Glycol 2000;
(ii) at least one diisocyanate component including Isophorone Disocyanate;
(iii) ratio of polyol and diisocyanate component is in the range of 1:1.25 to 1: 2.5.
5. The polyurethane and polyurethane-urea polymer as claimed in claims 1-4 wherein in said polyurethane and polyurethane-urea dispersions said component (II) is based on the following:
said AB2 type compounds including Dimethylol Propionic acid, Dimethylol butanoic acid, Adduct of trimethylol propane and maleic anhydride, Adduct of trimethylol propane and phthalic anhydride, Adduct of glycerol and maleic anhydride, adduct of glycerol and phthalic anhydride;
said AB3 and A2B2 type compounds including adduct of pentaerythritol and maleic anhydride and pentaerythritol and phthalic anhydride in select mole ratios of 2: 1.
6. A process for manufacturing said polyurethane and polyurethane-urea polymer and aqueous dispersion of the same and coating formulations thereof comprising the steps of
a) providing said pre-polymer component (I);
b) providing said component (II);
c) reacting components (I) and (II) to provide for polyurethane-urea polymer with ionic groups;
d) neutralizing the ionic group with tertiary amine to 70–100% neutralization of ionic groups and obtaining therefrom a stable dispersion with particle size between 60–200 nm;
e) adding water to obtain an aqueous dispersion of polyurethane-urea polymer at the solid level of 30-45% with the molecular wt. of the polymer in the range of 10000–30000 Dalton.
7. The process for manufacturing said polyurethane and polyurethane-urea polymer and aqueous dispersion as claimed in claim 6 wherein
said process is carried out free of organic solvents;
said prepolymer component (I) is attained at temperatures between 60–110 deg. C in presence of catalyst including Dibutyltin Dilaurate.
said reaction temperature for reaction between pre-polymer (I) and component (II) is selective between 60-90 deg C;
said neutralization with tertiary amine is selectively carried out in between 40–60 deg. C;
said adding water to enable a water dispersion of the thus attained polyurethane and polyurethane-urea dispersions is performed in the selective temperature range of 20-40 deg. C.

Dated the 9th day of March, 2024 Anjan Sen
(Applicants Agent)
IN/PA-199