US4781948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-based film-forming coating compositions and the use thereof
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1986-06-05
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Granted: 1988-11-01
•
Expires: 2006-06-05
Abstract
Abstract An acidic water-based film-forming coating composition suitable for the protection of ferrous surfaces by application thereto and drying at ambient temperature wherein said composition contains at least one acid of defined formula, such as lactic or tartaric acid, which prevents or reduces general yellow/brown staining.
Inventors
- 👤 David Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:06
CPC Classifications
C; C09; C09D; C09D127/00; C09D127/02; C09D127/04; C09D127/08; C09D127/06; C09D133/00; C09D133/04; C09D133/06; C09D5/00; C09D5/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
96 words
A method of protecting a ferrous substrate which method comprises (a) applying to said substrate an acidic water-based film-forming coating composition which comprises an aqueous latex or dispersion of a film-forming polymer, and also contains at least one crboxylic acid of formula R--(X) n --CO 2 H where R is carboxyl, H or lower alkyl (1 to 5 carbon atoms), X is --CH(OH)--, and n is 0, 1, 2, or 3, and (b) allowing the applied aqueous coating composition to dry at ambient temperature thereby to form by such drying a protective coating on the substrate.
Claim 2
Independent Claim
96 words
A method of protecting a ferrous substrate which method comprises (a) applying to said substrate an acidic water-based film-forming coating composition which comprises an aqueous latex or dispersion of a film-forming polymer, and also contains at least one crboxylic acid of formula R--(X) n --CO 2 H where R is carboxyl, H or lower alkyl (1 to 5 carbon atoms), X is --CH(OH)--, and n is 0, 1, 2, or 3, and (b) allowing the applied aqueous coating composition to dry at ambient temperature thereby to form by such drying a protective coating on the substrate.
Claim 3
Dependent Claim
26 words
A method according to claim 1 wherein the lower alkyl group of said carboxylic acid contained in the applied composition has 1 to 3 carbon atoms.
Claim 4
Dependent Claim
27 words
A method according to either claim 1 or claim 2 wherein said composition which is applied to the ferrous substrate comprises at least one corrosion inhibiting pigment.
Claim 5
Independent Claim
30 words
A method according to any one of claims 2, 3 or 1 wherein the pH of said composition which is applied is in the range of from 1 to 4.
Claim 6
Independent Claim
31 words
A method according to any one of claims 2-4 or 1 wherein the at least one carboxylic acid employed is selected from oxalic acid, formic acid, tartaric acid and lactic acid.
Claim 7
Independent Claim
36 words
A method according to any one of claims 2-5 or 1 wherein the amount of said at least one carboxylic acid used is 0.01 to 10% by weight based on the weight of the coating composition.
Claim 8
Dependent Claim
28 words
A method according to claim 6 wherein the amount of said carboxylic acid used is 0.5 to 2% by weight based on the weight of the coating composition.
Claim 9
Independent Claim
38 words
A method according to any one of claims 2-7 or 1 wherein said film-forming polymer used is a polymer comprising units derived from one or more monethylenically unsaturated monomers containing one or more olefin, vinyl, or vinylidene groups.
Claim 10
Dependent Claim
42 words
A method according to claim 8 wherein said film-forming polymer used is a copolymer comprising polymerised units of vinyl chloride, vinylidene chloride, and one or more alkyl acrylates or alkyl methacrylates having from 1 to 12 carbon atoms in the alkyl groups.
Claim 11
Dependent Claim
27 words
A method according to either claim 8 or claim 9 wherein said film-forming polymer used contains polymerised units of one or more aliphatic alpha-beta unsaturated carboxylic acids.
Claim 12
Independent Claim
21 words
A method according to any one of claims 2-10 or 1 wherein said composition which is used contains a colour-hiding pigment.
References Cited (Backward Citations)
US2439677A
Cited
US4104424A
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GB1245301A
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US3859235A
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GB1450916A
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US3901859A
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US4076861A
Cited
US4087397A
Cited
US4229503A
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US4243430A
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US4532159A
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US4419468A
Cited
US4425465A
Cited
US4481116A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-01 | 1992-05-02 | 1992-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-01 | 1996-05-02 | 1996-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-01 | 2000-05-02 | 2000-11-01 | $7700.00 | Window Closed / Lapsed |