Process for coating a metal substrate with a blend of a...

Details Process for coating a metal substrate with a blend of a... Process for coating a metal substrate with a blend of a...

C - Chemistry, Metallurgy

09

D

400/5113, 117/54

C09D 133/06 (2006.01) B05D 1/06 (2006.01) C08G 59/42 (2006.01) C08L 73/02 (2006.01)

Patent

CA 1057887

ABSTRACT OF THE DISCLOSURE A process for coating substrate 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 thermosetable 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 anyhdride-functionality. This copolymer has a glass transition temperature in the range of 40°C to 90°C, preferably 50°C 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. - 1 -

221447

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