US4732791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color plus clear application of thermosetting high solids coating composition of epoxies, polyols and anhydrides
Assignee: PPG Industries Ohio Inc
•
Filing: 1986-08-21
•
Granted: 1988-03-22
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Expires: 2006-08-21
Abstract
Abstract Disclosed herein is an improved process of preparing color-plus-clear coatings, the improvement comprising high solids thermosetting coating compositions comprising polyepoxides and anhydrides as effective curing agents therefor. Films from 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 J. Burkholder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:43
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/4284; C09; C09D; C09D163/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31511; Y10T428/31515; Y10T428/31529
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
150 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 thermosetting composition comprising: (a) a low number average molecular weight polyepoxide, (b) a low number average molecular weight hydroxyl group-containing polyfunctional material, and (c) a curing agent consisting essentially of an anhyydride and, (d) 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
150 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 thermosetting composition comprising: (a) a low number average molecular weight polyepoxide, (b) a low number average molecular weight hydroxyl group-containing polyfunctional material, and (c) a curing agent consisting essentially of an anhyydride and, (d) 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
16 words
The process of claim 1, wherein the polyepoxide contains more than two epoxy groups per molecule.
Claim 4
Dependent Claim
16 words
The process of claim 2, wherein the polyepoxide comprises three or more epoxy groups per molecule.
Claim 5
Dependent Claim
17 words
The process of claim 1, wherein the equivalent weight of the polyepoxide is about 50 to 1000.
Claim 6
Dependent Claim
33 words
The process of claim 1, wherein the polyepoxide is selected from the group consisting of glycidyl ethers, a glycidyl esters, glycidyl acrylic polymers, glycidyl isocyanates, epoxidized oils, cycoaliphatic epoxides and a mixture thereof.
Claim 7
Dependent Claim
21 words
The process of claim 1, wherein the hydroxy equivalent weight of the hydroxyl group-containing polyfunctional material is about 30 to 1000.
Claim 8
Dependent Claim
23 words
The process of claim 1, wherein the hydroxyl group containing polyfunctional material is a polyol comprising two or more hydoxyl groups per molecule.
Claim 9
Dependent Claim
16 words
The process of claim 7, wherein the polyol comprises three or more hydroxyl groups per molecule.
Claim 10
Dependent Claim
34 words
The process of claim 7, wherein the polyol is a simple polyol or a polymeric polyol selected from the group consisting of polyester polyol, polyether polyol, polyurethane polyol, acrylic polyol and a mixture thereof.
Claim 11
Dependent Claim
17 words
The process of claim 1, wherein the anhydride curing agent is a polyacid anhydride comprising a monoanhydride.
Claim 12
Dependent Claim
24 words
The process of claim 1, wherein the monoanhydride is an alkyl hexahydrophthalic anhydride wherein the alkyl group contains up to about seven carbon atoms.
Claim 13
Dependent Claim
12 words
The process of claim 11, wherein the acid-anhydride is methyl hexahydrophthalic anhydride.
Claim 14
Dependent Claim
18 words
The process of claim 1, wherein the cure catalyst is a tertiary amine or a quaternary ammonium salt.
Claim 15
Dependent Claim
19 words
The process of claim 1, wherein the thermosetting composition has a solids content of about 45 to 85 percent.
Claim 16
Dependent Claim
19 words
The process of claim 1, wherein the thermosetting composition has a VOC of less than 3.6 pounds per gallon.
Claim 17
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 |