Resin composition for thermosetting coating

Details Resin composition for thermosetting coating Resin composition for thermosetting coating

C - Chemistry, Metallurgy

08

L

C08L 33/00 (2006.01) C08L 61/20 (2006.01) C08L 63/10 (2006.01) C09D 133/00 (2006.01) C09D 133/06 (2006.01) C09D 161/20 (2006.01) C09D 163/10 (2006.01) C08L 33/06 (2006.01) C08L 61/32 (2006.01)

Patent

CA 2073145

Disclosed in a resin composition for thermosetting coating, which comprises: (a1) an acrylic copolymer having a particular acid value and/or (a2) an acrylic copolymer having a particular acid value and a particular hydroxyl value, (b) an acrylic copolymer having a particular epoxy equivalent, (c) a monobasic acid having a dissociation constant (pKa) of 3 or less, and, as necessary, (d) an amino resin, and (e) a quaternary phosphonium salt, wherein the equivalent ratio of the acid groups of (a1) and/or (a2) to the epoxy groups of (b) is 1:0.5 to 0.5:1 and the amounts of (c), (d) and (e) are 0.01-5 parts by weight, 1-25 parts by weight and 0.01-3 parts by weight, respectively, per 100 parts by weight of the total of (a1) and/or (a2) and (b). The resin composition, when used as a clear coating for automobiles, is superior in film appearance, acid resistance, solvent resistance, water resistance, weatherability, storage stability and low temperature curing.

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