US3919345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powdered coating composition containing polyanhydride, epoxy and anhydride functional copolymer and flow control agent
Assignee: EIDP Inc
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Filing: 1974-03-04
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Granted: 1975-11-11
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Expires: 1994-03-04
Abstract
Abstract A process for coating substrates is disclosed. In particular, a process is disclosed for painting metal objects such as automobile bodies by electrostatic spray of specifically limited powder coating compositions. More particularly, this invention is concerned with a process for painting metal objects by electrostatic spray of powder coating compositions which utilize as the thermosettable component a blend of a polymer of an anhydride of a dicarboxylic acid and an epoxy-functional, anhydride-functional, self-crosslinking copolymer of ethylenically unsaturated monomers. This copolymer is deficient in anhydride-functionality. This copolymer has a glass transition temperature in the range of 40* to 90*C, preferably 50* to 70*C, and a molecular weight (Mn) in the range of about 2,000 to about 10,000. The polyanhydride of the blend has a molecular weight in the range of about 300 to about 4,000, preferably about 1,500 to about 2,500.
Inventors
- 👤 Santokh S Labana
- 👤 Ares N Theodore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:43
CPC Classifications
C; C09; C09D; C09D133/00; C09D133/04; C09D133/06; C09D133/062; C09D133/068; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/4246; C08G59/4269; C08L; C08L73/00; C08L73/02; Y; Y10; Y10S; Y10S260/00; Y10S260/15; Y10S260/16; Y10S260/17; Y10S260/19
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
191 words
IN A METHOD FOR COATING A METAL SUBSTRATE WHEREINN A THERMOSETTABLE, FILM-FORMING POWDER IS ELECTROSTATICALLY SPRAYED UPON SAID SUBSTRATE AND CROSSLINKED THEREON WITH HEAT, THE IMPROVEMENT WHEREIN SAID THERMOSETABLE FILM-FORMING POWDER CONSISTS ESSENTIALLY OF A BLEND OF A. ABOUT 8 WEIGHT PERCENT OF A POLYMER OF MONOMERIC ANHYDRIDES OF SATURATED DICARBOXYLIC ACIDS HAVING A MOLECULAR WEIGHT IN THE RANGE OF ABOUT 300 TO ABOUT 4,000, AND B. ABOUT 92 TO ABOUT 98 WEIGHT PERCENT OF AN EPOXY-FUNCTIONAL, ANHYDRIDE-FUNCTIONAL COPOLYMER OF MONOETHYLENICALLY UNSATURATED MONOMERS CONSISTING ESSENTIALLY OF ABOUT 10 TO ABOUT 25 PERCENT BY WEIGHT OF A GLYCIDYL ESTER OF A MONETHYLENICALLY UNSATURATED ACID, ABOUT 4 TO ABOUT 12 PERCENT BY WEIGHT OF MONOMERIC ANHYDRIDE OF AN PLEFINICALLY UNSATURATED BICARBOXYLIC ACID, AND ABOUT 92 TO ABOUT 63 TO ABOUT 86 PERCENT BY WEIGHT OF MONOFUNCTIONAL, ETHYLENICALLY UNSATURATED MONOMERS, SAID COPOLYMER BEINGN FURTHER CHRACTERIZED IN HAVING AN AVERAGE MOLECULAR WEIGHT IN THE RANGE OF ABOUT 2,000 TO ABOUT 10,000 AND A GLASS TRANSITION TEMPERATURE IN THE RANGE OF ABOUT 40*C TO ABOUT 90*C. C. 0.05 RO 4.0 WEIGHT PERCENT OF A POLYMERIC FLOW CONTROL AGENT BASED ON THE WEIGHT OF (A) AND (B).
Claim 2
Dependent Claim
191 words
IN A METHOD FOR COATING A METAL SUBSTRATE WHEREINN A THERMOSETTABLE, FILM-FORMING POWDER IS ELECTROSTATICALLY SPRAYED UPON SAID SUBSTRATE AND CROSSLINKED THEREON WITH HEAT, THE IMPROVEMENT WHEREIN SAID THERMOSETABLE FILM-FORMING POWDER CONSISTS ESSENTIALLY OF A BLEND OF A. ABOUT 8 WEIGHT PERCENT OF A POLYMER OF MONOMERIC ANHYDRIDES OF SATURATED DICARBOXYLIC ACIDS HAVING A MOLECULAR WEIGHT IN THE RANGE OF ABOUT 300 TO ABOUT 4,000, AND B. ABOUT 92 TO ABOUT 98 WEIGHT PERCENT OF AN EPOXY-FUNCTIONAL, ANHYDRIDE-FUNCTIONAL COPOLYMER OF MONOETHYLENICALLY UNSATURATED MONOMERS CONSISTING ESSENTIALLY OF ABOUT 10 TO ABOUT 25 PERCENT BY WEIGHT OF A GLYCIDYL ESTER OF A MONETHYLENICALLY UNSATURATED ACID, ABOUT 4 TO ABOUT 12 PERCENT BY WEIGHT OF MONOMERIC ANHYDRIDE OF AN PLEFINICALLY UNSATURATED BICARBOXYLIC ACID, AND ABOUT 92 TO ABOUT 63 TO ABOUT 86 PERCENT BY WEIGHT OF MONOFUNCTIONAL, ETHYLENICALLY UNSATURATED MONOMERS, SAID COPOLYMER BEINGN FURTHER CHRACTERIZED IN HAVING AN AVERAGE MOLECULAR WEIGHT IN THE RANGE OF ABOUT 2,000 TO ABOUT 10,000 AND A GLASS TRANSITION TEMPERATURE IN THE RANGE OF ABOUT 40*C TO ABOUT 90*C. C. 0.05 RO 4.0 WEIGHT PERCENT OF A POLYMERIC FLOW CONTROL AGENT BASED ON THE WEIGHT OF (A) AND (B).
Claim 3
Dependent Claim
29 words
A method in accordance with claim 1 wherein said polymer of monomeric anhydrides of saturated dicarboxylic acids has molecular weight in the range of about 1,500 to about 2,500.
Claim 4
Dependent Claim
24 words
A method in accordance with claim 1 wherein said copolymer has a glass transition temperature in the range of about 50*C to about 70*C.
Claim 5
Dependent Claim
32 words
A method in accordance with claim 1 wherein said glycidyl ester of a monoethylenically unsaturated acid is glycidyl methacrylate and comprises about 12 to about 18 percent by weight of said copolymer.
Claim 6
Dependent Claim
36 words
A method in accordance with claim 1 wherein said monomeric anhydrides of saturated dicarboxylic acids are selected from the group consisting of maleic anhydride, citraconic anhydride, itaconic anhydride, dodecenyl succinic anhydride, dichloromaleic anhydride, and tetrahydrophthalic anhydride.
Claim 7
Dependent Claim
176 words
A thermosettable powder coating composition which exlusive of pigments and non-reactive materials consists essentially of a blend of A. about 2 to about 8 weight percent of a polymer of monomeric anhydrides of saturated dicarboxylic acids having a molecular weight in the range of about 300 to about 4,000, and B. about 92 to about 98 weight percent of an epoxy-functional, anhydride-functional copolymer of monoethylenically unsaturated monomers consisting essentially of about 10 to about 25 percent by weight of a glycidyl ester of a monoethylenically unsaturated acid, about 4 to about 12 percent by weight of a monomeric anhydride of an olefinically unsaturated dicarboxylic acid, and about 92 to about 63 to about 86 percent by weight of monofunctional, ethylenically unsaturated monomers, said copolymer being further characterized in having an average molecular weight in the range of about 2,000 to about 10,000 and a glass transition temperature in the range of about 40* to about 90*C. C. 0.05 to 4.0 weight percent of a polymeric flow control agent based on the weight of (A) and (B).
Claim 8
Dependent Claim
176 words
A thermosettable powder coating composition which exlusive of pigments and non-reactive materials consists essentially of a blend of A. about 2 to about 8 weight percent of a polymer of monomeric anhydrides of saturated dicarboxylic acids having a molecular weight in the range of about 300 to about 4,000, and B. about 92 to about 98 weight percent of an epoxy-functional, anhydride-functional copolymer of monoethylenically unsaturated monomers consisting essentially of about 10 to about 25 percent by weight of a glycidyl ester of a monoethylenically unsaturated acid, about 4 to about 12 percent by weight of a monomeric anhydride of an olefinically unsaturated dicarboxylic acid, and about 92 to about 63 to about 86 percent by weight of monofunctional, ethylenically unsaturated monomers, said copolymer being further characterized in having an average molecular weight in the range of about 2,000 to about 10,000 and a glass transition temperature in the range of about 40* to about 90*C. C. 0.05 to 4.0 weight percent of a polymeric flow control agent based on the weight of (A) and (B).
Claim 9
Dependent Claim
29 words
A method in accordance with claim 6 wherein said polymer of monomeric anhydrides of saturated dicarboxylic acids has molecular weight in the range of about 1,500 to about 2,500.
Claim 10
Dependent Claim
24 words
A method in accordance with claim 6 wherein said copolymer has a glass transition temperature in the range of about 50* to about 70*C.
Claim 11
Dependent Claim
32 words
A method in accordance with claim 6 wherein said glycidyl ester of a monoethylenically unsaturated acid is glycidyl methacrylate and comprises about 12 to about 18 percent by weight of said copolymer.
Claim 12
Dependent Claim
36 words
A method in accordance with claim 6 wherein said monomeric anhydrides of saturated dicarboxylic acids are selected from the group consisting of maleic anhydride, citraconic anhydride, itaconic anhydride, dodecenyl succinic anhydride, dichloromaleic anhydride, and tetrahydrophthalic anhydride.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |