Powder coatings with catalyzed transesterification cure

Details Powder coatings with catalyzed transesterification cure Powder coatings with catalyzed transesterification cure

1986-08-01

1988-05-03

Schofer, Joseph L.

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523428, 525340, 525379, 528 93, C08L 6300

Patent

active

047420960

ABSTRACT:
Improved powder coating compositions comprise a hydroxyl functional binder having carboxylic ester functionality and a transesterification cure catalyst comprising an epoxide and a non-acidic nucleophile, preferably onium salts. Resins such as hydroxyl functional acrylic, hydroxyl functional polyester, ester functional polyesters, and methyl succinate esters of bisphenol epoxides transesterify in the presence of an epoxide and phosphonium salts such as tetrabutylphosphonium acetate and yield coatings having exceptional hardness, impact resistance and solvent resistance at bake temperatures of about 300.degree. F.

REFERENCES:
patent: 4489182 (1984-12-01), Valko
patent: 4559180 (1985-12-01), Green

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