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Patent US3948792A successfully refreshed from Google Patents.
US3948792A
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US
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Corrosion and scale softening composition
Assignee: ChampionX LLC
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Filing: 1973-12-13
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Granted: 1976-04-06
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Expires: 1993-12-13
Abstract
Abstract A method and composition for reducing the amount of and softening silicate scale formation in automobile and diesel coolant systems where a silicate containing anti-corrosion formula is used which comprises adding to said formula an effective amount of a polymeric dispersant which is a water-soluble carboxylic acid polymer selected from a vinyl addition polymer and a carboxymethyl cellulose. The addition of polymeric dispersants to silicate containing corrosion inhibition formula such as the boron-nitrite type ameliorates or changes the character of the crystalline precipitate to a softer amorphous type and enables the utilization of anti-corrosion formulas at dosages of from about 2,000 up to 20,000 ppm without platingout side effects. Specially preferred dispersants are maleic anhydride copolymers and carboxymethyl cellulose. The advantages of the present invention may be realized in mixed precipitates containing silicate and also anions such as carbonate, phosphate, sulfate, etc., in the presence of alkaline earth cations.
Inventors
- 👤 Robert G. Watsen
- 👤 Edwin S. Troscinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:14
CPC Classifications
C; C23; C23F; C23F11/00; C23F11/08; C02; C02F; C02F5/00; C02F5/08; C02F5/10; C02F5/105; C09; C09K; C09K5/00; C09K5/20; F; F02; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/027; F02B3/00; F02B3/06
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
203 words
A corrosion and scale inhibitor composition for automobile and diesel coolant systems comprising an aqueous solution containing the following: I. a. from 40 to 90% water B. from 2 to 20% of an alkali metal silicate calculated as sodium metasilicate pentahydrate C. from 0 to 15% of an alkali metal nitrite calculated as sodium nitrite D. from 0 to 15% of an alkali metal nitrate calculated as sodium nitrate E. from 0 to 5% of a compound selected from the group consisting of mercaptobenzothiazole and alkali metal salts thereof F. from 3 to 60% of a compound selected from the group consisting of boric acid and alkali metal borates, the latter being calculated as the tetraborate pentahydrate G. an amount of a base selected from the group consisting of the alkali metal hydroxides, carbonates, and bicarbonates sufficient to provide a pH of about 8.5 to 10.5 in an aqueous solution of said composition. Ii. from 0.1 to 50% by weight, based on the weight of the solids present in I, of a polymeric dispersant which is a water-soluble carboxylic acid polymer selected from at least one member selected from the group consisting of a carboxylic acid containing vinyl addition polymer and carboxymethyl cellulose.
Claim 2
Dependent Claim
203 words
A corrosion and scale inhibitor composition for automobile and diesel coolant systems comprising an aqueous solution containing the following: I. a. from 40 to 90% water B. from 2 to 20% of an alkali metal silicate calculated as sodium metasilicate pentahydrate C. from 0 to 15% of an alkali metal nitrite calculated as sodium nitrite D. from 0 to 15% of an alkali metal nitrate calculated as sodium nitrate E. from 0 to 5% of a compound selected from the group consisting of mercaptobenzothiazole and alkali metal salts thereof F. from 3 to 60% of a compound selected from the group consisting of boric acid and alkali metal borates, the latter being calculated as the tetraborate pentahydrate G. an amount of a base selected from the group consisting of the alkali metal hydroxides, carbonates, and bicarbonates sufficient to provide a pH of about 8.5 to 10.5 in an aqueous solution of said composition. Ii. from 0.1 to 50% by weight, based on the weight of the solids present in I, of a polymeric dispersant which is a water-soluble carboxylic acid polymer selected from at least one member selected from the group consisting of a carboxylic acid containing vinyl addition polymer and carboxymethyl cellulose.
Claim 3
Dependent Claim
15 words
The composition according to claim 1 wherein the polymeric dispersant is a maleic anhydride copolymer.
Claim 4
Dependent Claim
13 words
The composition according to claim 1 wherein the polymeric dispersant is carboxymethyl cellulose.
Claim 5
Dependent Claim
41 words
The composition according to claim 1 wherein the anti-corrosion formula is utilized in the coolant systems in an amount of from about 2,000-20,000 ppm and the polymeric dispersant is utilized in an amount of from 0.1-10 weight percent of the formula.
Claim 6
Dependent Claim
41 words
The composition according to claim 1 wherein the anti-corrosion formula is utilized in the coolant systems in an amount of from about 5,000-12,000 ppm and the polymeric dispersant is utilized in an amount of from 0.1-10 weight percent of the formula.
Claim 7
Dependent Claim
25 words
The composition of claim 1 wherein the average molecular weight of the water-soluble carboxylic acid polymer is within the range of between 1,000 and 1,000,000.
Claim 8
Dependent Claim
25 words
The composition of claim 1 wherein the average molecular weight of the water-soluble carboxylic acid polymer is within the range of between 1,000 and 100,000.
Claim 9
Dependent Claim
167 words
A corrosion and scale inhibitor composition for automobile and diesel coolant systems comprising an aqueous solution containing the following: I. a. from 50 to 80% water B. from 1 to 20% of an alkali metal silicate calculated as sodium metasilicate pentahydrate C. from 4 to 12% of an alkali metal nitrite calculated as sodium nitrite D. from 4 to 12% of an alkali metal nitrate calculated as sodium nitrate E. from 0.5 to 3.0% of a compound selected from the group consisting of mercaptobenzothiazole and alkali metal salts thereof F. from 5 to 25% of a compound selected from the group consisting of boric acid and alkali metal borates, the latter being calculated as the tetraborate pentahydrate; Ii. from 0.1 to 50% by weight, based on the weight of the solids present in I, of a polymeric dispersant which is a water-soluble carboxylic acid polymer selected from at least one member selected from the group consisting of a carboxylic acid containing vinyl addition polymer and carboxymethyl cellulose.
Claim 10
Dependent Claim
167 words
A corrosion and scale inhibitor composition for automobile and diesel coolant systems comprising an aqueous solution containing the following: I. a. from 50 to 80% water B. from 1 to 20% of an alkali metal silicate calculated as sodium metasilicate pentahydrate C. from 4 to 12% of an alkali metal nitrite calculated as sodium nitrite D. from 4 to 12% of an alkali metal nitrate calculated as sodium nitrate E. from 0.5 to 3.0% of a compound selected from the group consisting of mercaptobenzothiazole and alkali metal salts thereof F. from 5 to 25% of a compound selected from the group consisting of boric acid and alkali metal borates, the latter being calculated as the tetraborate pentahydrate; Ii. from 0.1 to 50% by weight, based on the weight of the solids present in I, of a polymeric dispersant which is a water-soluble carboxylic acid polymer selected from at least one member selected from the group consisting of a carboxylic acid containing vinyl addition polymer and carboxymethyl cellulose.
Claim 11
Dependent Claim
165 words
A corrosion and scale inhibitor composition for automobile and diesel coolant systems comprising an aqueous solution containing the following: I. a. from 70-80% water B. from 2 to 4% of an alkali metal silicate calculated as sodium metasilicate pentahydrate C. from 5 to 10% of an alkali metal nitrite calculated as sodium nitrite D. from 5 to 7% of an alkali metal nitrate calculated as sodium nitrate E. from 0.8 to 1.5% of a compound selected from the group consisting of mercaptobenzothiazole and alkali metal salts therefor F. from 8 to 15% of a compound selected from the group consisting of boric acid and alkali metal borates, the latter being calculated as the tetraborate pentahydrate; Ii. from 0.1 to 50% by weight, based on the weight of the solids present in I, of a polymeric dispersant which is a water-soluble carboxylic acid polymer selected from at least one member selected from the group consisting of a carboxylic acid containing vinyl addition polymer and carboxymethyl cellulose.
Claim 12
Dependent Claim
165 words
A corrosion and scale inhibitor composition for automobile and diesel coolant systems comprising an aqueous solution containing the following: I. a. from 70-80% water B. from 2 to 4% of an alkali metal silicate calculated as sodium metasilicate pentahydrate C. from 5 to 10% of an alkali metal nitrite calculated as sodium nitrite D. from 5 to 7% of an alkali metal nitrate calculated as sodium nitrate E. from 0.8 to 1.5% of a compound selected from the group consisting of mercaptobenzothiazole and alkali metal salts therefor F. from 8 to 15% of a compound selected from the group consisting of boric acid and alkali metal borates, the latter being calculated as the tetraborate pentahydrate; Ii. from 0.1 to 50% by weight, based on the weight of the solids present in I, of a polymeric dispersant which is a water-soluble carboxylic acid polymer selected from at least one member selected from the group consisting of a carboxylic acid containing vinyl addition polymer and carboxymethyl cellulose.
Claim 13
Dependent Claim
149 words
A corrosion and scale inhibitor composition for automobile and diesel coolant systems comprising an aqueous solution containing the following: I. a. from 2 to 15% of an alkali metal silicate calculated as sodium metasilicate pentahydrate B. from 0 to 30% of an alkali metal nitrite calculated as sodium nitrite C. from 0 to 30% of an alkali metal nitrate calculated as sodium nitrate D. from 0 to 10% of a compound selected from the group consisting of mercaptobenzothiazole and alkali metal salts thereof E. from 15-99% of a compound selected from the group consisting of boric acid and alkali metal borates, the latter being calculated as the tetraborate pentahydrate; Ii. from 0.1 to 50% by weight of a polymeric dispersant which is a water-soluble carboxylic acid polymer selected from at least one member selected from the group consisting of a carboxylic acid containing vinyl addition polymer and carboxymethyl cellulose.
Claim 14
Dependent Claim
149 words
A corrosion and scale inhibitor composition for automobile and diesel coolant systems comprising an aqueous solution containing the following: I. a. from 2 to 15% of an alkali metal silicate calculated as sodium metasilicate pentahydrate B. from 0 to 30% of an alkali metal nitrite calculated as sodium nitrite C. from 0 to 30% of an alkali metal nitrate calculated as sodium nitrate D. from 0 to 10% of a compound selected from the group consisting of mercaptobenzothiazole and alkali metal salts thereof E. from 15-99% of a compound selected from the group consisting of boric acid and alkali metal borates, the latter being calculated as the tetraborate pentahydrate; Ii. from 0.1 to 50% by weight of a polymeric dispersant which is a water-soluble carboxylic acid polymer selected from at least one member selected from the group consisting of a carboxylic acid containing vinyl addition polymer and carboxymethyl cellulose.
Claim 15
Dependent Claim
151 words
A corrosion and scale inhibitor composition for automobile and diesel coolant systems comprising an aqueous solution containing the following: I. a. from 5 to 15% of an alkali metal silicate calculated as sodium metasilicate pentahydrate B. from 10 to 25% of an alkali metal nitrite calculated as sodium nitrite C. from 10 to 25% of an alkali metal nitrate calculated as sodium nitrate D. from 2 to 7% of a compound selected from the group consisting of mercaptobenzothiazole and alkali metal salts thereof E. from 40 to 80% of a compound selected from the group consisting of boric acid and alkali metal borates, the latter being calculated as the tetraborate pentahydrate; Ii. from 0.1 to 50% by weight of a polymeric dispersant which is a water-soluble carboxylic acid polymer selected from at least one member selected from the group consisting of a carboxylic acid containing vinyl addition polymer and carboxymethyl cellulose.
Claim 16
Dependent Claim
151 words
A corrosion and scale inhibitor composition for automobile and diesel coolant systems comprising an aqueous solution containing the following: I. a. from 5 to 15% of an alkali metal silicate calculated as sodium metasilicate pentahydrate B. from 10 to 25% of an alkali metal nitrite calculated as sodium nitrite C. from 10 to 25% of an alkali metal nitrate calculated as sodium nitrate D. from 2 to 7% of a compound selected from the group consisting of mercaptobenzothiazole and alkali metal salts thereof E. from 40 to 80% of a compound selected from the group consisting of boric acid and alkali metal borates, the latter being calculated as the tetraborate pentahydrate; Ii. from 0.1 to 50% by weight of a polymeric dispersant which is a water-soluble carboxylic acid polymer selected from at least one member selected from the group consisting of a carboxylic acid containing vinyl addition polymer and carboxymethyl cellulose.
Claim 17
Dependent Claim
151 words
A corrosion and scale inhibitor composition for automobile and diesel coolant sytems comprising an aqueous solution containing the following: I. a. from 5 to 10% of an alkali metal silicate calculated as sodium metasilicate pentahydrate B. from 12 to 20% of an alkali metal nitrite calculated as sodium nitrite C. from 15 to 20% of an alkali metal nitrate calculated as sodium nitrate D. from 2 to 5% of a compound selected from the group consisting of mercaptobenzothiazole and alkali metal salts thereof E. from 50 to 70% of a compound selected from the group consisting of boric acid and alkali metal borates, the latter being calculated as the tetraborate pentahydrate; Ii. from 0.1 to 50% by weight of a polymeric dispersant which is a water-soluble carboxylic acid polymer selected from at least one member selected from the group consisting of a carboxylic acid containing vinyl addition polymer and carboxymethyl cellulose.
Claim 18
Dependent Claim
151 words
A corrosion and scale inhibitor composition for automobile and diesel coolant sytems comprising an aqueous solution containing the following: I. a. from 5 to 10% of an alkali metal silicate calculated as sodium metasilicate pentahydrate B. from 12 to 20% of an alkali metal nitrite calculated as sodium nitrite C. from 15 to 20% of an alkali metal nitrate calculated as sodium nitrate D. from 2 to 5% of a compound selected from the group consisting of mercaptobenzothiazole and alkali metal salts thereof E. from 50 to 70% of a compound selected from the group consisting of boric acid and alkali metal borates, the latter being calculated as the tetraborate pentahydrate; Ii. from 0.1 to 50% by weight of a polymeric dispersant which is a water-soluble carboxylic acid polymer selected from at least one member selected from the group consisting of a carboxylic acid containing vinyl addition polymer and carboxymethyl cellulose.
Claim 19
Independent Claim
79 words
A method of reducing and softening silicate scale formation in automobile and diesel coolant systems, which scale formation results from the introduction into such coolant systems of an alkali metal silicate for purposes of preventing the corrosion of ferrous metals, which comprises adding at least 2,000 ppm of a polymeric dispersant which is a water-soluble carboxylic acid polymer selected from at least one member of the group consisting of a carboxylic acid containing vinyl addition polymer and carboxymethyl cellulose.
Claim 20
Independent Claim
79 words
A method of reducing and softening silicate scale formation in automobile and diesel coolant systems, which scale formation results from the introduction into such coolant systems of an alkali metal silicate for purposes of preventing the corrosion of ferrous metals, which comprises adding at least 2,000 ppm of a polymeric dispersant which is a water-soluble carboxylic acid polymer selected from at least one member of the group consisting of a carboxylic acid containing vinyl addition polymer and carboxymethyl cellulose.
Claim 21
Dependent Claim
15 words
The method according to claim 13 wherein the polymeric dispersant is a maleic anhydride copolymer.
Claim 22
Dependent Claim
13 words
The method according to claim 13 wherein the polymeric dispersant is carboxymethyl cellulose.
Claim 23
Dependent Claim
43 words
The method according to claim 1 wherein the anticorrosion formula is utilized in the coolant systems in an amount of from about 2,000 to 20,000 ppm and the polymeric dispersant is utilized in an amount of from 0.1-10 weight percent of the formula.
Claim 24
Dependent Claim
41 words
The method according to claim 13 wherein the anticorrosion formula is utilized in an amount in the coolant systems of from about 5,000-12,000 ppm and the polymeric dispersant is utilized in an amount of from 0.1-10 weight percent of the formula.
Claim 25
Dependent Claim
25 words
The method of claim 13 wherein the average molecular weight of the water-soluble carboxylic acid polymer is within the range of between 1,000 to 1,000,000.
Claim 26
Dependent Claim
25 words
The method of claim 13 wherein the average molecular weight of the water-soluble carboxylic acid polymer is within the range of between 1,000 to 100,000.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |