US4937288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powder coating composition
Assignee: PPG Industries Ohio Inc
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Filing: 1989-09-18
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Granted: 1990-06-26
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Expires: 2009-09-18
Abstract
Abstract A thermosetting powder coating composition which has good handling properties and which has a good blend of physical properties such as appearance, flexibility, hardness, solvent resistance, corrosion resistance and exterior durability is disclosed. The composition comprises a co-reactable particulate mixture of a carboxylic acid group-containing acrylic polymer, a second carboxylic acid group-containing material having sufficient crystallinity to assist in flow of the powder coating compositions and a beta-hydroxalkylamide crosslinking agent.
Inventors
- 👤 Paul H. Pettit, Jr.
- 👤 Debra L. Singer
- 👤 Marvin L. Kaufman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:15
CPC Classifications
C; C09; C09D; C09D133/00; C09D133/04; C09D133/06; C09D133/10; C09D133/12; C08; C08F; C08F8/00; C08F8/30; C08F8/46; C08G; C08G18/00; C08G18/06; C08G18/83; C08G18/833; C08K; C08K5/00; C08K5/16; C08K5/20; C09D133/062; C09D133/064; C08G2150/00; C08G2150/20; C08L; C08L2205/00; C08L2205/02; C08L67/00; C08L73/00; C08L73/02; C08L81/00; C08L81/02; Y; Y10; Y10S; Y10S525/00; Y10S525/934
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
130 words
A thermosetting powder coating composition comprising a co-reactable particulate mixture of: (a) 35 to 85 percent by weight based on weight on based solids of a carboxylic acid group-containing acrylic polymer having a Tg in the range of about 35° C. to 100° C.; (b) from about 1 to 25 percent by weight based on weight of resin solids of a carboxylic acid group-containing polyester having a number average molecular weight from about 300 to about 1500 and an acid equivalent weight of from about 150 to about 750, said polyester crystalline at temperatures under 50° C. for assisting flow of the powder coating composition; and (c) a beta-hydroxyalkylamide curing agent, the equivalent ratio of beta-hydroxyalkylamide equivalents to carboxylic acid equivalents being within the range of about 0.6 to 1.6:1.
Claim 2
Dependent Claim
130 words
A thermosetting powder coating composition comprising a co-reactable particulate mixture of: (a) 35 to 85 percent by weight based on weight on based solids of a carboxylic acid group-containing acrylic polymer having a Tg in the range of about 35° C. to 100° C.; (b) from about 1 to 25 percent by weight based on weight of resin solids of a carboxylic acid group-containing polyester having a number average molecular weight from about 300 to about 1500 and an acid equivalent weight of from about 150 to about 750, said polyester crystalline at temperatures under 50° C. for assisting flow of the powder coating composition; and (c) a beta-hydroxyalkylamide curing agent, the equivalent ratio of beta-hydroxyalkylamide equivalents to carboxylic acid equivalents being within the range of about 0.6 to 1.6:1.
Claim 3
Dependent Claim
23 words
The composition of claim 1 in which the acrylic polymer has a number average molecular weight within the range of 1,500 to 15,000.
Claim 4
Dependent Claim
54 words
The composition of claim 1 in which the acrylic polymer is formed from polymerizing an alpha, beta-ethylenically unsaturated carboxylic acid selected from the class consisting of acrylic acid and methacrylic acid, a C 1 to C 20 alkyl ester of acrylic or methacrylic acid including mixtures of such esters and a polymerizable vinyl aromatic
Claim 5
Dependent Claim
39 words
The composition of claim 1 wherein the polyester is the action product of a C 4 to C 20 dicarboxylic acid and an aliphatic diol at an equivalent ratio of acid to alcohol of about 3:2 to about 2:1.
Claim 6
Dependent Claim
91 words
The composition of claim 1 in which the beta-hydroxyalkylamide is of the structure: ##STR4## wherein R 1 is H or C 1 -C 5 alkyl; R 2 is H, C 1 -C 5 alkyl or ##STR5## wherein R 1 is as described above and A is a chemical bond or monovalent or polyvalent organic radical derived from saturated, unsaturated or aromatic hydrocarbon radicals including substituted hydrocarbon radicals containing from 2 to 20 carbon atoms; m equals 1 to 2 and n equals 0 to 2 and m+n is at least 2.
Claim 7
Dependent Claim
20 words
The composition of claim 4 wherein the equivalent ratio of acid to alcohol in the reaction product is about 2:1.
Claim 8
Dependent Claim
19 words
The composition of claim 1 wherein the polyester melts in range from about 50° C. to about 110° C.
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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) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |