Process for production of a powder coating

Details Process for production of a powder coating Process for production of a powder coating

1997-03-17

1998-06-09

Lipman, Bernard

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

524379, 524561, 5253273, 5253288, 5253309, 525386, 5253276, 525384, C08F 612

Patent

active

057635358

ABSTRACT:
A process for production of a powder coating comprising: copolymerizing a monomer mixture comprising a (meth)acrylate monomer having branched or cyclic substituents of four or more carbon atoms in its side chain and a (meth)acrylate monomer having functional groups to form a thermosetting vinyl copolymer (a) having a glass transition temperature of approximately 40.degree. to 100.degree. C. and a number average molecular weight of approximately 1,000 to 10,000; dissolving or dispersing said copolymer (a) and a crosslinking agent (b) in a solvent comprising approximately at least 50% by weight based on the weight of the solvent, of tert-butanol, to form a resulting coating solution having a melting point of not less than approximately -30.degree. C.; and lyophilizing said coating solution under a pressure not higher than approximately 50 mmHg. The present process produces a powder coating without polymerization due to progression of reaction upon heat generated during production, and without generation of gelated material.

REFERENCES:
patent: 4044190 (1977-08-01), Miller et al.
patent: 4212918 (1980-07-01), Marquisee
patent: 5043404 (1991-08-01), Mahabadi et al.

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