US4289826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water-borne coating for metal surfaces
Assignee: Occidental Chemical Corp
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Filing: 1978-12-22
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Granted: 1981-09-15
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Expires: 1998-12-22
Abstract
Abstract Aqueous compositions are employed to form a protective coating on metal surfaces, in particular, ferrous or tin surfaces, and are especially useful for the coating of blackplate or tin-plated cans. The compositions contain, in the form of an aqueous emulsion, an epoxy resin, an alkylated melamine-formaldehyde resin, an acid catalyst, a block copolymer of ethylene oxide and propylene oxide and water. The composition is applied to a clean metal surface by any conventional technique and even-cured to provide a protective, paint-receptive coating.
Inventors
- 👤 John K. Howell, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:55
CPC Classifications
C; C09; C09D; C09D163/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31529; Y10T428/31678; Y10T428/31688
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
216 words
A process for coating a ferrous or tin surface comprising contacting the surface thereof with an aqueous composition comprising: (a) an epoxy resin having an average molecular weight of about 900 to 2,900 and about 2.7 to 11.6 hydroxyl equivalents per mole; (b) melamine-formaldehyde resin alkylated with at least one alcohol of from 1 to 4 carbon atoms in a weight ratio of epoxy resin:melamine-formaldehyde resin of from 2:1 to 20:1; (c) an acid catalyst which is an ammonium salt of an anion of the formula: R--O--CH.sub.2 CH.sub.2 O).sub.m SO.sub.3.sup.- wherein R is an alkyl or alkylaryl group of at least 10 carbon atoms and containing a saturated alkyl portion and m is in the range of about 4 to 30 in an amount sufficient to effect cross linking of the epoxy resin and melamine-formaldehyde resin; (d) a block copolymer of general formula ##STR3## having an HLB in excess of 22 and a molecular weight in the range of about 5,000 to 14,000 in an amount of about 2 to 12 wt. % of the total of the epoxy and melamine-formaldehyde resin; and (e) water, the balance, wherein the total of the components (a), (b), (c) and (d) concentrations ranges from 5 to 85 wt. % of the aqueous composition and thereafter heat-curing the applied coating.
Claim 2
Dependent Claim
216 words
A process for coating a ferrous or tin surface comprising contacting the surface thereof with an aqueous composition comprising: (a) an epoxy resin having an average molecular weight of about 900 to 2,900 and about 2.7 to 11.6 hydroxyl equivalents per mole; (b) melamine-formaldehyde resin alkylated with at least one alcohol of from 1 to 4 carbon atoms in a weight ratio of epoxy resin:melamine-formaldehyde resin of from 2:1 to 20:1; (c) an acid catalyst which is an ammonium salt of an anion of the formula: R--O--CH.sub.2 CH.sub.2 O).sub.m SO.sub.3.sup.- wherein R is an alkyl or alkylaryl group of at least 10 carbon atoms and containing a saturated alkyl portion and m is in the range of about 4 to 30 in an amount sufficient to effect cross linking of the epoxy resin and melamine-formaldehyde resin; (d) a block copolymer of general formula ##STR3## having an HLB in excess of 22 and a molecular weight in the range of about 5,000 to 14,000 in an amount of about 2 to 12 wt. % of the total of the epoxy and melamine-formaldehyde resin; and (e) water, the balance, wherein the total of the components (a), (b), (c) and (d) concentrations ranges from 5 to 85 wt. % of the aqueous composition and thereafter heat-curing the applied coating.
Claim 3
Dependent Claim
36 words
The process of claim 1 wherein the block copolymer has an HLB of at least about 29 and wherein the value of b is about 30 and the sum of a plus c is about 150.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein the total concentration of (a), (b), (c) and (d) is not in excess of about 60 wt. %.
Claim 5
Dependent Claim
23 words
The process of claim 3 wherein the total concentration of (a), (b), (c) and (d) is from about 12 to 40 wt. %.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein the aqueous composition exhibits pH value of from 4.5 to about 81/2.
Claim 7
Dependent Claim
27 words
The process of claim 1 wherein the composition additionally contains a salt of phosphoric acid in an amount sufficient to increase the phase stability of the composition.
Claim 8
Dependent Claim
29 words
The process of claim 9 wherein the composition additionally contains benzoic acid or a salt thereof in an amount sufficient to inhibit rusting of the metal surface upon drying.
Claim 9
Dependent Claim
16 words
A ferrous or tin surface having thereon a coating obtained by the process of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-14 | 1985-03-16 | 1985-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-14 | 1989-03-16 | 1989-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-14 | 1993-03-16 | 1993-09-15 | $7700.00 | Window Closed / Lapsed |