FORM -2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See Section 10; rule 13)
A COMPOSITION FOR THE WATER TREATMENT AND THE PROCESS FOR
MANUFACTURING THE SAME
THERMAX LIMITED
an Indian Company
of D-13, M.I.D.C. Industrial Area, R.D. Aga Road,
Chinchwad,Pune-411019,
Maharashtra, India
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER
IN WHICH IT IS TO BE PERFORMED

FIELD OF THE INVENTION
The present invention relates to a water treatment composition for preventing the formation of scales, corrosion and also to act as a biocide and a process for manufacturing the same.
BACKGROUND OF THE INVENTION
Water used in industrial aqueous systems such as steam generating boilers, hot water heaters, heat exchangers, cooling towers, desalination systems, cleaning systems, pipe lines, gas scrubber systems and associated equipment contains various impurities. These impurities typically include alkaline earth cations such as calcium, barium, and magnesium and several anions such as bicarbonate, carbonate, sulfate, oxalate, phosphate, silicate, and fluoride. These anions and cations combine and form precipitates due to the pH, pressure, or temperature in the system or the presence of additional ions with which they form insoluble products. The most common impurities in industrial water supplies are the water hardening ions such as the calcium, magnesium and carbonate ions. In addition to precipitating as carbonates, calcium and magnesium as well as any iron or copper present can also react with phosphate, sulfate, and silicate ions to form respective complex insoluble salts. These insoluble products accumulate on surfaces of the system and result into the scale formation.
The water may also contain various solids such as mud, clay, iron oxides, silt, sand and other mineral matter and microbiological debris. These solids accumulate as sludge in the system. Iron oxides may be present in the feed water and may be produced by corrosion of metal surfaces in contact with the water. The sludge may become incorporated in the scale deposits and form a strongly adherent scale.

Sludge and scale deposits greatly reduce heat transfer efficiency by settling at low flow points in the system and limiting the circulation of the water and insulating it from the heat surfaces. In addition to interfering with heat transfer and fluid flow, corrosion of metal surfaces underneath the deposits is facilitated since corrosion control agents are unable to contact the surfaces effectively. The deposits also harbor bacteria. Removal of the deposits can cause expensive delays and furthermore, at times it also stops the whole operation and therefore is always associated with severe cost implications.
Water cooling systems, particularly water cooling towers, require continuous maintenance in order to avoid fouling caused by sludge, scale and microorganisms, and corrosion. Different types of chemicals/chemical compounds have been known in the art for removal of scale and/or sludge formation in the water cooling towers.
One class of such compounds include carboxylic acid particularly, Polycarboxylic acids and their copolymers and the sulphonated copolymers. These polymers mainly act as dispersants, antiscaling agents and prevent formation of the crystalline structure in scale. Moreover, these polymers when combined with anticorrosive compounds which include but not limited to phosphonate, phosphates, zinc, molybdate show synergistic performance.
Phosphonates are a well defined class of threshold inhibitors used to prevent scale formation. Typically used phosphonates for inhibiting the scale formation are aminomethylenephosphonic acid and 1-hydroxyl ethylidene-l,l-diphosphonic acid. A commonly employed organo phosphorous carboxylic acid is 2-phosphonobutane- 1, 2, 4-tricarboxylic acid.

In addition to corrosion and scale inhibitors and dispersants, water cooling towers are also treated with certain biocides or biostats. These biocides or biostats prevent or inhibit the growth of algae, fungi and bacteria. Biocides can be classified as oxidizing biocides and non-oxidizing biocides. Typical oxidizing biocides include C102, chlorine and also the chlorine releasing compounds such as chlorinated isocyanurates, hypochlorites and chlorinated hydantoins. Quaternary ammonium compounds are the primary non-oxidizing biocides and biostats. These quaternary ammonium salts are found to be more effective against algae and bacteria in alkaline pH ranges.
EXISTING KNOWLEDGE
Following Patents disclose several methods of preparation of water treatment
composition:
US 3,985,671 discloses a synergistic blend of polyaminoalkylenephosphonate and
a Polyquaternary ammonium chloride compound and a method for preventing the
formation of scale in a water recirculating system.
US 4,032,460 discloses a method of inhibiting the formation of scale from aqueous solutions containing scale-forming ions at temperatures of up to 400° F. and above during production and utilization of such aqueous solutions comprising adding to the solutions certain amines, amides, thioamides, carboxylic acids or amide reaction products of carboxylic acids and various amines.
US 4,556,493 discloses the use of synergistic blend of styrene sulphonic acid co maleic acid, organic phosphonate and nitrilotriacetic acid or ethylenediamine tetraacetic acid based chelant to control scale formation in an aqueous system.

Furthermore, the US patent also teaches that each component is added separately to an aqueous system.
US 4,719,083 discloses a composition for a water cooling tower. Such composition includes a water soluble aromatic azole corrosion inhibitor such as benzotriazole, an organophosphorous antiscalant and a polymeric quaternary ammonium compound. The composition as disclosed in the abovementioned US Patent is used as corrosion inhibitor, scale inhibitor and continues biocide.
US 4,931,189 discloses the use of blend of acrylic acid and /or Maleic acid polymer with phosphonate like diethylentriamine penta (methylenephosphonic acid) or salts thereof for inhibition of scale formation in aqueous environment
US 4,150,026 discloses the metal salt complexes of 3-isothiazolones and compositions containing them. The composition provided in the US Patent exhibit useful biocidal properties, including bactericidal, fungicidal, and algaecidal properties.
US 4,552,591 discloses a biocide composition for oil field fluid polymers and oil field water polymers. The composition comprises a biocide adsorbed on the surface of a solid, particulate adsorbent. The composition lessens personal and environmental contamination by spilled or splashed liquid biocides.
Most of the composition used for preventing scale formation and corrosion are employed in the high concentrations. Furthermore, these raw materials are added separately in basin of cooling tower and then mixed or combined in water for specific performance. Still further, some of the raw materials have detrimental

effect on stability of product when one tries to mix them as a single product or as synergistic composition.
Thus, there is felt a need to develop a stable composition for preventing the formation of scales as well as corrosion in more effective manner without deteriorating the properties of the composition.
OBJECTS OF THE INVENTION
It is an object of the present invention to provide a composition for preventing the formation of scales and corrosion.
Another object of the present invention is to provide a composition which acts as a biocide.
Another object of the present invention is to provide a composition with improved stability.
Another object of the present invention is to provide a composition which is stable over a prolonged period of time.
Yet another object of the present invention is to provide a composition to prevent the scale formation and corrosion in the cooling tower.
Still another object of the present invention is to provide a composition which acts as a bacterioside as well as algicide.

Still another object of the present invention is to provide a composition of low concentration components.
Still another object of the present invention is to provide a process for preparing a composition.
SUMMARY OF THE INVENTION
In accordance with the present invention, there is provided a water treatment composition typically for preventing the formation of scales and corrosion and as a biocide, said composition comprising
a. a polymeric antiscaling agent present in an amount of 10% to 40% of
the total mass of the composition;
b. a biocide compound present in an amount of 1 % to 10 % of the total
mass of the composition; and
c. optionally, a phosphate compound present in an amount of 5 % to
25% of the total mass of the composition, a phosphonate compound
present in an amount of 5 % to 25 % of the total mass of the
composition and an Inorganic corrosion inhibitor present in an amount
of 5 % to 20% of the total mass of the composition.
Typically, the polymeric antiscaling agent is Polycarboxylic acid and is at least one selected from the group consisting of Polymaleic acid, sulphonated Polymaleic acid, Polyacrylic homopolymer, Polyacrylic acid - 2-Acrylamido-2-Methylpropane Sulfonic Acid Copolymer (AMPS), Acrylic acid and terpolymers thereof.

Typically, the polymeric antiscaling agent is Polymaleic acid.
Alternatively, the polymeric antiscaling agent is a copolymer of Polyacrylic acid -2-Acrylamido-2-Methylpropane Sulfonic Acid Copolymer (AMPS).
Typically, the polymeric antiscaling agent is used alone in the composition.
Alternatively, the polymeric antiscaling agent is used in combination with other polymers in the composition.
Typically, the biocide compound is at least one selected from the group consisting of Isothiazolines, benzisothiazolines, bisguanidine salts, bronpol, Tetrakis (hydroxymethyl) phosphonium sulfate (THPS) and mixtures thereof.
Preferably, the biocide compound is Isothiazoline which is a mixture of Methylisothiazolinone and chloromethylisothiazolinone.
In accordance with another embodiment of the present invention, a water treatment composition typically for preventing the formation of scales and corrosion and as a biocide in water cooling tower, said composition comprising
• a polymeric antiscaling agent present in an amount of 10% to 30% of the total mass of the composition;
• a biocide compound present in an amount of 1 % to 3 % of the total mass of the composition;
• a phosphate compound present in an amount of 10 % to 20% of the total mass of the composition;

• a phosphorate compound present in an amount of 5 % to 10 % of the total mass of the composition; and
• an Inorganic corrosion inhibitor present in an amount of 5 % to 15% of the total mass of the composition.
Typically, the phosphate compound is at least one selected from the group consisting of phosphoric acid, sodium hexametaphosphate, Tetrakis pyrophosphate and sodium tripolyphosphate.
Typically, the phosphonate compound is at least one selected from the group consisting of 1-Hydroxy Ethylidene-lfl-T)iphosphonjc Acid (HEDP), Amino trismethylene phosphonic acid, phosphonobutane tricarboxylic acid , Bis (Hexamethylenetriamine ( pentamethylene phosphonic acid) ) phosphonoaceticacid,phosphonobutanetriacrboxylic acid and Polyamino Polyether Methylene Phosphonae (PAPEMP).
Typically, the inorganic corrosion inhibitor is selected from the group consisting of zinc salts, sodium tungstate and sodium molybdate.
In accordance with another aspect of the present invention, a process for preparation of a water treatment composition typically for preventing the formation of scales and corrosion and as a biocide, said process comprising the following steps:
• adding to a reactor equipped with a stirrer, cooling and heating
devices, about 20% of acrylic acid and 2-Acrylamido-2-
Methylpropane Sulfonic Acid Copolymer (AMPS) copolymer

containing about 34% of demineralized water to obtain a first reaction solution at a temperature of about 30°C to 50°C;
• mixing about 8 % of zinc chloride powder to the first reaction solution;
• continuously mixing the first reaction solution at temperature of about 30°C to 50°C to obtain a second uniform solution;
• adding 17% mixture of phosphoric acid and hydroxyethylidene diphosphonic acid to the second uniform solution with uniform mixing at a temperature of 30 °C to 50°C; and
• mixing about 10% of isothiazoline along with about 3% of magnesium nitrate to the second solution to obtain a composition.
DETAILED DESCRIPTION OF THE INVENTION
According to the present invention there is provided a water treatment composition for preventing the formation of scales and corrosion and process for manufacturing the same.
The composition provided in accordance with the present invention shows improved stability over a longer period of time. The biocide employed in said composition is found to be compatible at high concentrations with carboxylic acid dispersants and scale inhibitors and optionally also with corrosion inhibitors and phosphate type corrosion inhibitors.
The composition provided in accordance with the present invention is employed for continuously treating a water cooling system, particularly a water cooling tower. This composition prevents the corrosion, scaling in the water cooling tower and thus acts as a bacterioside and an algicide.

Also, the composition provided in accordance with the present invention is utilized for continuously treating a reverse osmosis system which prevents the scaling formation, biofouling of the system and thus acts as a biocide. Thus, in accordance with the present invention a water treatment composition typically for preventing the formation of scales and corrosion and as a biocide, said composition comprising:
A polymeric antiscaling agent present in an amount of 10% to 40% of the total mass of the composition; a biocide compound present in an amount of 1 % to 10 % of the total mass of the composition; and optionally, a phosphate compound present in an amount of 5 % to 25% of the total mass of the composition, a phosphonate compound present in an amount of 5 % to 25 % of the total mass of the composition and an Inorganic corrosion inhibitor present in an amount of 5 % to 20% of the total mass of the composition.
The polymeric antiscaling agent is Polycarboxylic acid and can be at least one selected from the group of Polymaleic acid, sulphonated Polymaleic acid, Polyacrylic homopolymer, Polyacrylic acid - 2-Acrylamido-2-Methylpropane Sulfonic Acid Copolymer (AMPS), Acrylic acid and terpolymers thereof. In accordance with the present invention, the polymeric antiscaling agent is Polymaleic acid or is a copolymer of Polyacrylic acid - 2-Acrylamido-2-Methylpropane Sulfonic Acid Copolymer (AMPS). The polymeric antiscaling agent is used either alone in the composition or in combination with other polymers in the composition. The synergistic effect is observed when the polymeric antiscaling agent is used in combination with other polymer. The biocide employed in said composition prevents or inhibits the growth of algae, fungi and bacteria. The biocide compound can be at least one selected from the
11

group consisting of Isothiazolines, benzisothiazolines, bisguanidine salts, bronpol, Tetrakis (hydroxymethyl) phosphonium sulfate (THPS) and mixtures thereof. Preferably, the biocide compound is Isothiazoline which is employed as a mixture of Methylisothiazolinone and chloromethylisothiazolinone.
In accordance with another embodiment of the present invention a water treatment composition typically for preventing the formation of scales and corrosion and as a biocide in water cooling tower, said composition comprising a polymeric antiscaling agent present in an amount of 10% to 30% of the total mass of the composition; a biocide compound present in an amount of 1 % to 3 % of the total mass of the composition; a phosphate compound present in an amount of 10 % to 20% of the total mass of the composition; a phosphonate compound present in an , amount of 5 % to 10 % of the total mass of the composition; and an Inorganic corrosion inhibitor present in an amount of 5 % to 15% of the total mass of the composition.
The phosphate compound which acts as a corrosion inhibitor can be at least one selected from the group consisting of phosphoric acid, sodium hexametaphosphate, Tetrakis pyrophosphate and sodium tripolyphosphate.
In accordance with the present invention the phosphonate compounds are employed in the composition to inhibit scale formation and can be at least one selected from the group consisting of 1-Hydroxy Ethylidene-l,l-Diphosphonic Acid (HEDP), Amino trismethylene phosphonic acid, phosphonobutane tricarboxylic acid , Bis (Hexamethylenetriamine ( pentamethylene phosphonic

acid)), phosphonoaceticacid ,phosphonobutane tricarboxylic acid and Polyamino
Polyether Methylene Phosphonate (PAPEMP).
In accordance with the present invention the inorganic corrosion inhibitor is
selected from the group consisting of zinc salts, sodium tungstate and sodium
molybdate.
In accordance with another aspect of the present invention there is provided a process for preparation of a water treatment composition typically for preventing the formation of scales and corrosion and as a biocide which comprises following steps:
The first reaction solution is obtained by adding about 20% of acrylic acid and 2-Acrylamido-2-Methylpropane Sulfonic Acid Copolymer (AMPS) copolymer and about 34 % of demineralized water into a reactor which is equipped with a stirrer, cooling and heating devices. To this about 8 % of zinc chloride powder is added. The first reaction solution is then heated at temperature of about 30°C to 50°C to obtain a second uniform solution about 17% mixture of phosphoric acid and about 5% hydroxyethylidene diphosphonic acid is added to the second uniform solution with continuous stirring and about 10% of isothiazolme along with 3% of magnesium nitrate are added to the second solution to obtain a composition.

The invention will now be described by way of examples and illustrations which do not limit the scope and ambit of the invention.
EXAMPLES
Example 1
Following example suggests utility of present invention to make a single product for use in cooling tower
To a reactor equipped with mechanical stirrer, cooling & heating devices (20.6 gms) of acrylic acid co AMPS polymer was added to 34.85 gms of demineralized water. Further (8.75 gms) of zinc chloride powder was added to uniform solution. (17.0 gms) of 85% phosphoric acid and (5 gms) of 60% Hydroxyethylidene diphosphonic acid were added to above mixture. Finally (10.8 gms) of isothiazoline was added along with (3 gms) of Magnesium nitrate.
The percentage of the Isothiazoline present in said composition was monitored
immediately. The composition was kept for longer duration to check the stability
of the composition prepared in accordance with the present invention. The
Isothiazoline percentage was monitored on instrumentation after 8 days, after 1
month and after 2 months respectively. The results are tabulated as follows:
Isothiazoline % Immediate After 8 days After 1 month After 2 month
1.56% 1.56% 1.51% 1.49%
Table 1: ___^
Isothiazoline Immediate After 8 days After 1 After 2
% month month
| 1.56% | 1.56% | 1.51% | 1.49%
The results as illustrated in the above mentioned table shows that the composition remains stable over longer period of time with very little deterioration.

Example 2
Efficiency of the composition as a biocide for reverse osmosis system:
The reverse osmosis system was treated with the composition prepared in
accordance with the present invention to check the suitability of the composition as
a biocide. 30 ppm of composition was fed to the RO system at a temperature of
35°C.
RO reject water analysis is as follows:
Sulphate 1680 ppm as ion,
Carbonates - 300 ppm as ion,
Silica- 50 ppm as Si02,
Ca hardness 260ppm as Ca,
Magnesium hardness - 80 ppm as Mg; and
Initial bacterial count 10 sub 7
Table II:
Sample particulars Final count % bacterial kill
Sample nol 2*10 sub 5 >95%
Sample no2 1* 10 sub 6 90%
Sample particulars Final count % bacterial kill
Sample nol 2*10 sub 5 >95%
Sample no2 1* 10 sub 6 90%
It was observed from the above table that the sample 1 shows 95% reduction in the bacteria count and sample 2 shows 90% reduction in the bacteria count and thus proving the suitability of the composition as a biocide.

Table IIA
Inhibition efficiency of the composition against the scale formation for reverse
osmosis system:
The reverse osmosis system was treated with the composition prepared in
accordance with the present invention to check the suitability of the composition as
a scale inhibitor. 10 ppm of composition was fed to the RO system at a temperature
of45°C.
RO reject water analysis is as follows:
Sulphate 3000 ppm as ion;
Carbonates - 160 ppm as ion;
Silica- 25 ppm as Si02; total hardness 225 ppm;
Ca hardness 140 ppm as Ca;
Magnesium hardness - 85 ppm as Mg
Sample particulars Residual hardness % Scale inhibition
No treatment 12 ppm —
Sample nol 213 ppm 94.3%
Sample no2 220 ppm 97.65%
Sample particulars Residual hardness % Scale inhibition
No treatment 12 ppm
Sample no 1 213 ppm 94.3%
Sample no2 220 ppm 97.65%
It was observed from the table that the sample 1 shows about 94% reduction in the scale formation and sample 2 shows about 97% reduction in the scale formation and thus proving the suitability of the composition as a scale inhibitor.

Example 3
Inhibition efficiency of the composition against corrosion in water cooling systems
The water cooling system was treated with the composition prepared in accordance
with the present invention to check the suitability of the composition as scale and
corrosion inhibitor. 30 ppm of said composition was fed to the water cooling
system at a temperature of about 35 C.
Recirculatory water analysis is as follows:
Chloride 170 ppm as ion;
Carbonates - 20 ppm as ion,
Silica- 3 ppm as Si02,
Ca hardness 20 ppm as Ca,
Magnesium hardness - 10 ppm as Mg ,
Table III
Sample particulars Corrosion rate mpy (Mi 11 i-inch per year)
Blank No treatment 27 mpy
Sample no3 2.4 mpy
Sample no4 l.llmpy
Sample particulars Corrosion rate mpy
(Mi 11 i-inch per year)
Blank No treatment 27 mpy
Sample no3 2.4 mpy
Sample no4 1.11 mpy
The abovementioned table shows that, substantive reduction in corrosion rate was observed with the sample no. 4 thereby establishing the suitability the composition as a corrosion inhibitor in the water cooling systems.

TECHNICAL ADVANCE
The water treatment composition typically for preventing the formation of scales and corrosion and the process for making the same provided in accordance with the present invention offers many advantages:
• A composition which is single product system for continuous treating reverse osmosis system and water cooling systems;
• A composition which acts as a biocide by preventing the scaling formation and biofouling of the reverse osmosis;
% A composition which acts as a bacterioside and as an algicide by preventing the corrosion and scaling formation in the water cooling system;
• A composition thus formed shows improved stability over a prolong period of time;
• A components/raw materials are employed in comparatively low concentration thereby eliminating the adverse effects on the water treatment systems; and
• Cost-effective composition.
The numerical values given for various physical parameters, dimensions and quantities are only approximate values and it is envisaged that the values higher or lower than the numerical value assigned to the physical parameters, dimensions and quantities fall within the scope of the invention and the claims unless there is a statement in the specification to the contrary.
In view of the wide variety of embodiments to which the principles of the present invention can be applied, it should be understood that the illustrated embodiments

are exemplary only. While considerable emphasis has been placed herein on the particular features of this invention, it will be appreciated that various modifications can be made, and that many changes can be made in the preferred embodiments without departing from the principle of the invention. These and other modifications in the nature of the invention or the preferred embodiments 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 invention and not as a limitation.

WE CLAIM:
1. A water treatment composition typically for preventing the formation of
scales and corrosion and as a biocide, said composition comprising:
a. a polymeric antiscaling agent present in an amount of 10% to 40% of
the total mass of the composition;
b. a biocide compound present in an amount of 1 % to 10 % of the total
mass of the composition; and
c. optionally, a phosphate compound present in an amount of 5 % to
25% of the total mass of the composition, a phosphonate compound
present in an amount of 5 % to 25 % of the total mass of the
composition and an Inorganic corrosion inhibitor present in an amount
of 5 % to 20% of the total mass of the composition.
2. A water treatment composition as claimed in claim 1, wherein the polymeric antiscaling agent is Polycarboxylic acid and is at least one selected from the group consisting of Polymaleic acid , sulphonated Polymaleic acid, Polyacrylic homopolymer, Polyacrylic acid - 2-Acrylamido-2-Methylpropane Sulfonic Acid Copolymer (AMPS), Acrylic acid and terpolymers thereof.
3. A water treatment composition as claimed in claim 1, wherein the polymeric antiscaling agent is Polymaleic acid.
4. A water treatment composition as claimed in claim 1, wherein the polymeric antiscaling agent is a copolymer of Polyacrylic acid - 2-Acrylamido-2-Methylpropane Sulfonic Acid Copolymer (AMPS).

5. A water treatment composition as claimed in claim 1, wherein the polymeric antiscaling agent is used alone in the composition.
6. A water treatment composition as claimed in claim 1, wherein the polymeric antiscaling agent is used in combination with other polymers in the composition.
7. A water treatment composition as claimed in claim 1, wherein the biocide compound is at least one selected from the group consisting of Isothiazolines, benzisothiazolines, bisguanidine salts, bronpol , Tetrakis (hydroxymethyl) phosphonium sulfate (TUPS) and mixtures thereof.
8. A water treatment composition as claimed in claim 1, wherein the biocide compound is Isothiazoline which is a mixture of Methylisothiazolinone and chloromethylisothiazolinone.
9. A water treatment composition typically for preventing the formation of scales and corrosion and as a biocide in water cooling tower, said composition comprising
a. a polymeric antiscaling agent present in an amount of 10% to 30% of
the total mass of the composition;
b. a biocide compound present in an amount of 1 % to 3 % of the total
mass of the composition;
c. a phosphate compound present in an amount of 10 % to 20% of the
total mass of the composition;

d. a phosphonate compound present in an amount of 5 % to 10 % of the
total mass of the composition; and
e. an Inorganic corrosion inhibitor present in an amount of 5 % to 15%
of the total mass of the composition.
10.A water treatment composition as claimed in claim 9, wherein the phosphate compound is at least one selected from the group consisting of phosphoric acid, sodium hexametaphosphate, Tetrakis pyrophosphate and sodium tripolyphosphate.
11.A water treatment composition as claimed in claim 9, wherein the phosphonate compound is at least one selected from the group consisting of 1-Hydroxy Ethylidene-l,l-Diphosphonic Acid (HEDP), Amino trismethylene phosphonic acid, phosphonobutane tricarboxylic acid , Bis (Hexamethylenetriamine(pentamethylenephosphonicacid)) phosphonoaceticacid , Phosphonotricarboxylic acid and Polyamino Polyether Methylene Phosphonae (PAPEMP).
12.A water treatment composition as claimed in claim 9, wherein the inorganic corrosion inhibitor is at least one selected from, the group consisting of zinc salts, sodium tungstate and sodium molybdate.
13.A process for preparation of a water treatment composition typically for preventing the formation of scales and corrosion and as a biocide, said process comprising the following steps:

t adding to a reactor equipped with a stirrer, cooling and heating devices, about 20% of acrylic acid and 2-Acrylamido-2-Methylpropane Sulfonic Acid Copolymer (AMPS) copolymer containing about 34% of demineralized water to obtain a first reaction solution at a temperature of about 30°C to 50°C;
• mixing About 8% of zinc chloride powder to the first reaction solution;
• continuously mixing the first reaction solution at temperature of about 30°C to 50°C to obtain a second uniform solution;
• adding about 17% mixture of phosphoric acid and hydroxyethylidene diphosphonic acid to the second uniform solution with uniform mixing at a temperature of 30°C to 50°C; and
• mixing about 10% of isothiazoline along with about 3 % of magnesium nitrate to the second solution to obtain a composition.