US4650718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color plus clear coatings employing polyepoxides and polyacid curing agents
Assignee: PPG Industries Ohio Inc
•
Filing: 1985-08-19
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Granted: 1987-03-17
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Expires: 2005-08-19
Abstract
Abstract A color-plus-clear coating system is 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. Either the transparent top coat, the base coat or both the top coat and base coat compositions are crosslinkable compositions comprising a polyepoxide and a polyacid curing agent which comprises a half-ester formed from reacting an acid anhydride with a polyol. The polyepoxide-polyacid curing agent in the transparent top coat provides a composite coating with outstanding gloss and distinctness of image making the composite coating particularly useful as an automotive top coat.
Inventors
- 👤 Dennis A. Simpson
- 👤 Debra L. Singer
- 👤 Rostyslaw Dowbenko
- 👤 William P. Blackburn
- 👤 Charles M. Kania
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:43
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/50; B05D7/52; B05D7/53; B05D7/536; C; C09; C09D; C09D163/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31522; Y10T428/31529
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
95 words
A process for applying a composite coating to a substrate which comprises applying to the substrate a colored film-forming composition to form a base coat and applying to said base coat a clear film-forming composition to form a transparent top coat over the base coat comprising as the clear film-forming composition and/or as the colored film-forming composition a crosslinkable composition comprising a polyepoxide and a polyacid curing agent which is a half-ester formed from reacting an acid anhydride with a polyol; there being from 0.3 to 3 equivalents of acid for each equivalent of epoxy.
Claim 2
Dependent Claim
95 words
A process for applying a composite coating to a substrate which comprises applying to the substrate a colored film-forming composition to form a base coat and applying to said base coat a clear film-forming composition to form a transparent top coat over the base coat comprising as the clear film-forming composition and/or as the colored film-forming composition a crosslinkable composition comprising a polyepoxide and a polyacid curing agent which is a half-ester formed from reacting an acid anhydride with a polyol; there being from 0.3 to 3 equivalents of acid for each equivalent of epoxy.
Claim 3
Dependent Claim
17 words
The process of claim 1 in which the crosslinkable composition is used as the clear film-forming composition.
Claim 4
Dependent Claim
36 words
The process of claim 1 in which the polyepoxide is a copolymer of a monoethylenically 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 process 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 process 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 process 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 process 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 process 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
14 words
The process of claim 1 in which the crosslinkable composition contains hydrolyzable silane groups.
Claim 11
Dependent Claim
19 words
The process of claim 3 in which the crosslinkable composition contains hydrolyzable silane groups in the epoxy-containing acrylic polymer.
Claim 12
Dependent Claim
46 words
The process of claim 1 in which the half-ester is of the structure: ##STR2## where X is the residue of a 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 13
Dependent Claim
16 words
The process of claim 11 in which the polyol is a diol, triol, or mixture thereof.
Claim 14
Dependent Claim
21 words
The process of claim 12 in which the polyol is selected from the class consisting of trimethylolpropane, neopentyl glycol and 1,6-hexanediol.
Claim 15
Dependent Claim
24 words
The process of claim 11 in which the 1,2-dicarboxylic acid anhydride is selected from the class consisting of hexahydrophthalic anhydride and alkyl-substituted hexahydrophthalic anhydrides.
Claim 16
Dependent Claim
27 words
The process 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 17
Dependent Claim
16 words
The process of claim 1 in which the crosslinkable composition contains an acid functional acrylic polymer.
Claim 18
Dependent Claim
22 words
The process of claim 16 in which the acid functional acrylic polymer has a number average molecular weight of 500 to 5000.
Claim 19
Dependent Claim
47 words
The process of claim 16 in which the acid functional acrylic polymer is prepared from a mixture of acrylic monomers which includes from 10 to 60 percent by weight of an acid functional acrylic monomer; the percentage by weight being based on total weight of acrylic monomers.
Claim 20
Dependent Claim
35 words
The process of claim 16 in which the acid functional acrylic polymer is present in the crosslinkable composition in amounts of from 0 to 50 percent by weight, based on total weight of resin solids.
Claim 21
Dependent Claim
13 words
The process of claim 1 in which the crosslinkable composition contains an anhydride.
Claim 22
Dependent Claim
15 words
The process of claim 20 in which the anhydride is a liquid at 25° C.
Claim 23
Dependent Claim
14 words
The process of claim 21 in which the anhydride is an alkyl hexahydrophthalic anhydride.
Claim 24
Dependent Claim
27 words
The process of claim 20 in which the anhydride is present in amounts of 0 to 40 percent by weight based on total weight of resin solids.
Claim 25
Dependent Claim
20 words
The process of claim 1 in which the crosslinkable composition has a resin solids content of at least 50 percent.
Claim 26
Dependent Claim
11 words
A substrate coated in accordance with the process of claim 1.
Claim 27
Dependent Claim
11 words
A substrate coated in accordance with the process of claim 16.
Claim 28
Dependent Claim
11 words
A substrate coated in accordance with the process of claim 20.
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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) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |