C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
402/192, 400/420
C07C 69/75 (2006.01) C08G 18/32 (2006.01) C08G 18/42 (2006.01) C08L 63/02 (2006.01) C08L 67/02 (2006.01) C09D 161/20 (2006.01) C09D 167/02 (2006.01)
Patent
CA 1191154
ABSTRACT OF THE DISCLOSURE A novel tetrahydroxy oligomer crosslinkable with amine-aldehyde resins to form a coating composition adapted for use as an automotive topcoat and which upon curing forms a hard, glossy, coating with outstanding dura- bility 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 to 2000 and being the reaction product of: (i) an ester containing pendant hydroxyl and car- boxyl functionality and being made by a reaction wherein the reactants consist essentially of: (a) a C3 to 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 to 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) an amine-aldehyde crosslinking agent, and (C) optionally a hydroxyl functional additive; and (D) solvent. The amine aldehyde crosslinking agent is included in the composition in an amount sufficient to provide at least about 0.60 equivalents of nitrogen crosslinking func- tionality for each equivalent of hydroxyl functionality included in the composition either on the tetrahydroxy oligomer or as a hydroxyl group of the hydroxy functional additive.
413491
Ford Motor Company Of Canada Limited
Sim & Mcburney
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