Patent US4849283A successfully refreshed from Google Patents.
US4849283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite coatings employing polyepoxides and polyacid curing agents in base coats
Assignee: PPG Industries Inc
•
Filing: 1987-07-16
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Granted: 1989-07-18
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Expires: 2007-07-16
Abstract
Abstract A color plus clear composite coating and process are disclosed. A pigmented or colored base coat is first applied to a substrate followed by the application of a transparent top coat to the base coat. The base coat composition is a liquid crosslinkable composition comprising a polyepoxide and a polyacid curing agent which comprises a half ester formed from reacting an acid anhydride with a polyol. The top coat composition is a powder coating. The resultant composite coating exhibits improved distinctness of image, making the composite coating particularly useful as an automotive top coat.
Inventors
- 👤 Samuel Porter, Jr.
- 👤 Dennis A. Simpson
- 👤 William P. Blackburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:29
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/50; B05D7/52; B05D7/53; B05D7/534; B05D5/00; B05D5/06; B05D5/067; B05D5/068; C; C09; C09D; C09D163/00; B05D2451/00; B05D2504/00; B05D2601/00; B05D2601/02; B05D2601/08; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31529; Y10T428/31678; Y10T428/31692; Y10T428/31699; Y10T428/31855
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
57 words
An improved composite coating comprising a pigmented base coat over which is applied a clear powder top coat comprising a resin selected from the group consisting of an epoxy, a polyester and acrylic resin; the improvement comprising the base coat which comprises a liquid crosslinkable composition which consists essentially of a polyepoxide and a polyacid curing agent.
Claim 2
Dependent Claim
57 words
An improved composite coating comprising a pigmented base coat over which is applied a clear powder top coat comprising a resin selected from the group consisting of an epoxy, a polyester and acrylic resin; the improvement comprising the base coat which comprises a liquid crosslinkable composition which consists essentially of a polyepoxide and a polyacid curing agent.
Claim 3
Dependent Claim
21 words
The coating of claim 1 wherein the ratio of the acid group to the epoxide group is from 0.3 to 3:1.
Claim 4
Dependent Claim
36 words
The coating of claim 1 in which the polyepoxide is a copolymer of a monethylenically unsaturated monomer having at least one epoxy group and at least one monoethylenically unsaturated monomer which is free of epoxy groups.
Claim 5
Dependent Claim
20 words
The coating of claim 3 in which the copolymer has a number average molecular weight of between 500 and 20,000.
Claim 6
Dependent Claim
26 words
The coating of claim 4 in which the copolymer is a copolymer of glycidyl acrylate or methacrylate with at least one other copolymerizable ethylenically unsaturated monomer.
Claim 7
Dependent Claim
37 words
The coating of claim 5 in which the other copolymerizable ethylenically unsaturated monomer comprises at least in part an alkyl ester of acrylic or methacrylic acid containing from 1 to 20 carbon atoms in the alkyl group.
Claim 8
Dependent Claim
28 words
The coating of claim 5 in which the glycidyl acrylate or methacrylate comprises from 5 to 60 percent of the monomers used in preparing the epoxy-containing acrylic polymer.
Claim 9
Dependent Claim
34 words
The coating of claim 3 in which the epoxy group-containing acrylic polymer is present in the crosslinkable composition in amounts of 10 to 90 percent by weight based on total weight of resin solids.
Claim 10
Dependent Claim
21 words
The coating of claim 1 in which the crosslinkable composition further contains an auxiliary curing agent which is a melamine resin.
Claim 11
Dependent Claim
50 words
The coating of claim 1 in which the polyacid curing is a half ester of the structure: ##STR2## where X is the residue of the polyol after reaction with the 1,2-dicarboxylic acid anhydride, R is an organic moiety associated with the anhydride, and A is equal to at least 2.
Claim 12
Dependent Claim
16 words
The coating of claim 10 in which the polyol is a diol, triol, or mixture thereof.
Claim 13
Dependent Claim
21 words
The coating of claim 11 in which the polyol is selected from the class consisting of trimethylopropane, neopentyl glycol, and 1,6-hexanediol.
Claim 14
Dependent Claim
24 words
The coating of claim 10 in which the 1,2-dicarboxylic acid anhydride is selected from the class consisting of hexahydrophthalic anhydride and alkyl-substituted hexahydrophthalic anhydrides.
Claim 15
Dependent Claim
28 words
The coating of claim 1 in which the half ester is present in amounts of 10 to 90 percent by weight based on total weight of resin solids.
Claim 16
Dependent Claim
68 words
An improved process for preparing a composite coating on a metallic substrate which comprises applying to the substrate a pigmented base coat and applying to said base coat a clear powder coating composition to form a top coat over the base coat followed by heating the composite coating to a temperature sufficient to affect cure, the improvement comprising the base coat which is as recited in claim 1.
Claim 17
Dependent Claim
17 words
An article of matter comprising a metallic substrate which is prepared by the process of claim 15.
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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) | 1992-07-17 | 1993-01-16 | 1993-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-17 | 1997-01-16 | 1997-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-17 | 2001-01-16 | 2001-07-18 | $7700.00 | Window Closed / Lapsed |