C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
400/7416, 400/74
C08G 18/32 (2006.01) C08G 18/42 (2006.01) C09D 161/20 (2006.01) C09D 167/02 (2006.01)
Patent
CA 1200344
ABSTRACT OF THE DISCLOSURE A novel tetrahydroxy oligomer crosslinkable with polyisocyanates to form a coating composition adapted for use as an automotove topcoat and which upon curing forms a hard, glossy, coating with outstanding durability and excellent resistance to solvents and water. The coating composition comprises. (A) a tetrahydroxy oligomer having a number average (Mn) molecular weight of between about 600 - 2000 and being the reaction product of: (i) an ester containing pendant hydroxyl and carboxyl functionality and being made by reacting: (a) a C3 - C10 aliphatic diol, and (b) an alkyl hexahydrophthalic anhydride, wherein (a) and (b) are combined in the reaction mixture in an amount sufficient to allow reaction in about a 1:1 molar ratio; and (ii) a diepoxide having a number average molecular weight between about 130-1500, wherein (i) and (ii) are combined in the reaction mixture in an amount sufficient to allow reaction in about a 2:1 molar ratio, (B) a polyisocyanate crosslinking agent; and (C) optionally a hydroxyl functional additive. The polyisocyanate crosslinking agent having two or more reactive isocyanate groups per molecule is included in the composition in an amount sufficient to provide betweem about 0.50 and about 1.6 reactive isocyanate groups per hydroxyl groups present in the composition either on the tetrahydroxy oligomer or as a hydroxyl group of the hydroxy functional additive.
413134
Ford Motor Company Of Canada Limited
Sim & Mcburney
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