US4222912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low temperature curing epoxy ester copolymers
Assignee: DeSoto Inc
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Filing: 1978-11-13
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Granted: 1980-09-16
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Expires: 1998-11-13
Abstract
Abstract Low temperature curing aqueous coatings are provided by combining a water soluble bisphenol polyol with a branched copolymer of an unsaturated epoxy ester with monoethylenic monomers including about 3% to about 20% carboxyl-functional monomer, based on the weight of the copolymer, so that the copolymer can be dispersed in water with the aid of a volatile base. The solids content is increased or the viscosity is lowered, the curing temperature is reduced, and the corrosion resistance is enhanced by the presence of the bisphenol polyol.
Inventors
- 👤 Kazys Sekmakas
- 👤 Raj Shah
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:49
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/44; C09D5/4419; C09D5/4423; C09D5/4426; C08; C08F; C08F290/00; C08F290/08; C08F290/14; C08F290/144; C08F299/00; C08F299/02; C08F299/026; C09D163/00; C09D163/10; C09D4/00; C09D4/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
81 words
An aqueous coating composition containing a branched copolymer of an ethylenically unsaturated epoxy ester with monoethylenic monomers including about 3% to about 20% of carboxyl-functional monomer selected from the group consisting of acrylic acid, methacrylic acid, fumaric acid, and maleic acid based on the weight of the copolymer, the copolymer being dispersed in the aqueous composition with the aid of a volatile base, an aminoplast or phenoplast resin curing agent, and a water soluble polyol formed by ethoxylation of a bisphenol.
Claim 2
Dependent Claim
81 words
An aqueous coating composition containing a branched copolymer of an ethylenically unsaturated epoxy ester with monoethylenic monomers including about 3% to about 20% of carboxyl-functional monomer selected from the group consisting of acrylic acid, methacrylic acid, fumaric acid, and maleic acid based on the weight of the copolymer, the copolymer being dispersed in the aqueous composition with the aid of a volatile base, an aminoplast or phenoplast resin curing agent, and a water soluble polyol formed by ethoxylation of a bisphenol.
Claim 3
Dependent Claim
25 words
An aqueous coating composition as recited in claim 1 in which said copolymer includes residual unsaturation providing an iodine number of at least about 40.
Claim 4
Dependent Claim
34 words
An aqueous coating composition as recited in any of claims 1 or 2 in which said carboxyl-functional monomers are present in an amount of from 5% to 12% of the weight of the copolymer.
Claim 5
Dependent Claim
117 words
An aqueous coating composition as recited in any of claims 1 or 2 in which said epoxy ester is constituted by a resinous polyepoxide having an epoxy functionality in the range of from 1.4 to about 2.0 esterified with at least about 0.2 moles of ethylenically unsaturated monocarboxylic fatty acid containing conjugated ethylenic unsaturation per epoxy equivalent in the polyepoxide, and at least about 0.5 mole of ethylenically unsaturated monocarboxylic fatty acid containing non-terminal nonconjugated ethylenic unsaturation per epoxy equivalent in the polyepoxide, said monocarboxylic fatty acids containing from 8-22 carbon atoms and being present in stoichiometric excess with respect to epoxy functionality, and to react with at least some of the hydroxy groups which are present.
Claim 6
Dependent Claim
28 words
An aqueous coating composition as recited in any of claims 1 or 2 in which said polyol is present in an amount from 2-25% of total resin solids.
Claim 7
Dependent Claim
36 words
An aqueous coating composition as recited in claim 5 in which hexamethoxy methyl melamine is the curing agent and is used in an amount of from 5% to 50%, based on the total weight of resin.
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) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |