Thermosettable powder coating composition comprising an...

Details Thermosettable powder coating composition comprising an... Thermosettable powder coating composition comprising an...

C - Chemistry, Metallurgy

08

L

400/5113

C08L 63/10 (2006.01) C08G 81/00 (2006.01) C09D 133/06 (2006.01) C09D 163/00 (2006.01) C08L 33/06 (2006.01)

Patent

CA 1043936

A THERMOSETTABLE POWDER COATING COMPOSITION COMPRISING AN EPOXY-FUNCTIONAL COPOLYMER AND AN ANHYDRIDE-FUNCTIONAL COPOLYMER ABSTRACT OF THE DISCLOSURE Powder coating compositions are disclosed which comprise a blend of qualitatively-monofunctional, quantita- tively-poly-functional, coreactive copolymers. One polymer of the blend is an epoxy-functional copolymer of about 5 to about 20 weight percent of a glycidyl ester of a mono- ethylenically unsaturated acid and about 80 to about 95 weight percent of monoethylenically unsaturated, quantitatively and qualitatively-monofunctional monomers. The second polymer of the blend is a copolymer of about 5 to about 20 weight percent of an anhydride of an olefinically-unsaturated dicarboxylic acid and about 80 to about 95 weight percent of monoethylenically unsaturated, quantitatively and qualitatively-monofunctional monomers. The epoxy-functional copolymer and the anhydride-functional copolymer are blended in such proportions as to provide about 0.4 to about 1 anhydride group per epoxy group.

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