Claims
- 1. A thermosetting powdery coating composition which comprises, in admixture:
- (A) from 40 to 98 parts by weight of a fluorine-containing copolymer comprising a monomeric moiety derived from a fluoroolefin compound and having hydroxyl groups as the crosslinkable reactive groups of which the content of fluorine is at least 10% by weight, the intrinsic viscosity determined at 30.degree. C. in tetrahydrofuran is in the range from 0.05 to 2 dl/g, the glass transition temperature is in the range from 35.degree. C. to 120.degree. C. and the weight loss by heating does not exceed 2%; and
- (B) from 60 to 2 parts by weight of a blocked isocyanate compound as the curing agent capable of forming crosslinks by reacting with the crosslinkable reactive groups in the fluorine-containing copolymer.
- 2. The thermosetting powdery coating composition of claim 1 wherein the fluoroolefin compound is selected from the group consisting of tetrafluoroethylene, chlorotrifluoroethylene, trifluoroethylene, vinylidene, fluoride, hexafluoropropylene and pentafluoropropylene.
- 3. The thermosetting powdery coating composition of claim 1 wherein the content of fluorine in the fluorine-containing copolymer is in the range from 15 to 72% by weight.
- 4. The thermosetting powdery coating composition of claim 1 wherein the fluorine-containing copolymer is a copolymer of a monomeric mixture comprising a fluoroolefin compound and a comonomer copolymerizable therewith and having a crosslinkable reactive group.
- 5. The thermosetting powdery coating composition of claim 4 wherein the monomeric mixture contains from 30 to 70% by moles of the fluoroolefin compound.
- 6. The thermosetting powdery coating composition of claim 1 wherein the fluorine-containing copolymer has a hydroxyl value in the range from 1 to 200 mg KOH/g.
- 7. The thermosetting powdery coating of claim 1 wherein the fluorine-containing copolymer has a hydroxyl value in the range from 20 to 140 mg KOH/g.
- 8. The thermosetting powdery coating composition of claim 7 wherein the glass transition temperature is in the range from 45.degree. to 120.degree. C.
- 9. The thermosetting powdery coating composition as claimed in claim 8, wherein the fluorine-containing copolymer is a copolymer of a monomeric mixture comprising a fluoroolefin compound and a comonomer copolymerizable therewith and having a crosslinkable reactive group.
- 10. The thermosetting powdery coating composition as claimed in claim 9 wherein the monomeric mixture contains from 30 to 70% by moles of the fluoroolefin compound.
- 11. The thermosetting powdery coating composition of claim 1 wherein the glass transition temperature is in the range from 45.degree. to 120.degree. C.
- 12. The thermosetting powdery coating composition as claimed in claim 9 wherein (A) and (B) are in a weight ratio of 50:50 to 97:3.
- 13. The thermosetting powdery coating composition as claimed in claim 12, wherein the glass transition temperature is 35.degree. to 100.degree. C.
- 14. The thermosetting powdery coating composition as claimed in claim 13, wherein the composition has a particle diameter not exceeding 400 .mu.m.
Priority Claims (1)
Number |
Date |
Country |
Kind |
62-192816 |
Jul 1987 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 07/224,054, filed Jul. 25, 1988 now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4640966 |
Mitani et al. |
Feb 1987 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
2822116 |
Nov 1978 |
DEX |
2081727 |
Feb 1982 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Detroit Society for Painting Technology (pp. 30-37), 49th Annual Meeting of the Fed. Societies for Paint Technology, Detroit, Mich. |
Continuations (1)
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Number |
Date |
Country |
Parent |
224054 |
Jul 1988 |
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