US4732790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color plus clear application of thermosetting high solids coating composition of hydroxy-functional epoxies and anhydrides
Assignee: PPG Industries Ohio Inc
•
Filing: 1986-08-21
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Granted: 1988-03-22
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Expires: 2006-08-21
Abstract
Abstract Disclosed herein is an improved process for preparing color-plus-clear coatings, the improvement comprising high solids thermosetting coating compositions comprising hydroxy-functional polyepoxides and anhydrides as effective curing agents therefor. Films of these coating compositions are of remarkable appearance and are attended by remarkably low volatile organic content (VOC).
Inventors
- 👤 William P. Blackburn
- 👤 Ronald R. Ambrose
- 👤 Samuel Porter, Jr.
- 👤 Mary Jo Burkholder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:12
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/50; B05D7/52; B05D7/53; B05D7/532; C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C09; C09D; C09D163/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31529
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
139 words
An improved process of applying a composite coating to a substrate, said process comprising 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; followed by heating the composite coating to a temperature sufficient to provide effective cure; the improvement comprising the clear and/or base coat containing a high solids solvent-based thermosetting composition comprising: (a) a low number average molecular weight hydroxy-functional polyepoxide, (b) a curing agent consisting essentially of an anhydride, (c) a cure catalyst selected from the group consisting of an onium salt which is a quaternary ammonium salt or a phosphonium salt, and a tertiary amine; said composition is characterized in that it is curable in the absence of a melamine curing agent.
Claim 2
Dependent Claim
139 words
An improved process of applying a composite coating to a substrate, said process comprising 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; followed by heating the composite coating to a temperature sufficient to provide effective cure; the improvement comprising the clear and/or base coat containing a high solids solvent-based thermosetting composition comprising: (a) a low number average molecular weight hydroxy-functional polyepoxide, (b) a curing agent consisting essentially of an anhydride, (c) a cure catalyst selected from the group consisting of an onium salt which is a quaternary ammonium salt or a phosphonium salt, and a tertiary amine; said composition is characterized in that it is curable in the absence of a melamine curing agent.
Claim 3
Dependent Claim
18 words
The process of claim 1, wherein the hydroxy-functional polyepoxide has an epoxide equivalent weight of 50 to 1000.
Claim 4
Dependent Claim
36 words
The process of claim 1, wherein the hydroxy-functional polyepoxide is selected from the group consisting of a glycidyl acrylic polymer, a glycidyl ether, a glycidyl ester, glycidyl isocyanate, epoxidized oils, cycloaliphatic epoxides and a mixture thereof.
Claim 5
Dependent Claim
15 words
The process of claim 1, wherein the hydroxy-functional polyepoxide contains three or more epoxy groups.
Claim 6
Dependent Claim
11 words
The process of claim 1, wherein the hydroxy-functional polyepoxide is aliphatic.
Claim 7
Dependent Claim
17 words
The process of claim 1, wherein the hydroxy-functional polyepoxide has a hydroxy equivalent of 50 to 1000.
Claim 8
Dependent Claim
17 words
The process of claim 1, wherein the anhydride curing agent is a polyacid anhydride comprising a monoanhydride.
Claim 9
Dependent Claim
24 words
The process of claim 7, wherein the monoanhydride is an alkyl hexahydrophthalic anhydride wherein the alkyl group contains up to about seven carbon atoms.
Claim 10
Dependent Claim
12 words
The process of claim 8, wherein the monoanhydride is methyl hexanhydrophthalic anhydride.
Claim 11
Dependent Claim
18 words
The process of claim 1, wherein the cure catalyst is a tertiary amine or a quaternary ammonium salt.
Claim 12
Dependent Claim
19 words
The process of claim 1, wherein the thermosetting composition has a solids content of about 45 to 85 percent.
Claim 13
Dependent Claim
20 words
The process of claim 1, wherein the thermosetting composition has a VOC of about 3.6 pounds per gallon or less.
Claim 14
Dependent Claim
13 words
An article of matter which is prepared by the process of claim 1.
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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) | 1991-03-22 | 1991-09-21 | 1992-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-22 | 1995-09-21 | 1996-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-22 | 1999-09-21 | 2000-03-22 | $7700.00 | Window Closed / Lapsed |