Patent ID: 6828405
Filing Date: 2004-12-07
Classification: C08G,C09D

Abstract:
A coating composition comprising:(i) 1-40 percent by weight of an imine which comprises the reaction product of 2 moles of isobutyraldehyde and one mole of isophorone diamine; (ii) 15-55 percent by weight of a polyisocyanate having an average of at least two isocyanate groups per molecule; (iii ) 1-50 percent by weight of at least one polyaspartic ester; (iv) 1-20 percent by weight of an isocyanate functional urethane comprising the reaction product of: (a) an aliphatic polyisocyanate having an average of at least 2.1 isocyanate groups per molecule and selected from the group consisting of biurets and isocyanates of linear aliphatic diisocyanates; and (b) at least one monofunctional alcohol having a molecular weight less than about 500 and which is selected from the group consisting of: â€ƒwherein n is from 1 to about 10; R1 is an aliphatic radical of 1 to about 12 carbons; R2 is H or CH3; R3 and R1 are independently aliphatic of 1 to about 12 carbons or H; R5 is an aliphatic radical of 1 to about 8 carbons or nothing; X is â€ƒand R6 is an aliphatic radical of 1 to about 12 carbons, and (c) at least one diol having the formula: â€ƒwherein R7 is H or CH3 and y is from 1 to about 40; wherein the total NCO/OH equivalents ratio is greater than 1.0 and the ratio of OH equivalents from (b) to OH equivalents from (c) ranges from 0.3:1 to 2.0:1.0; and wherein (ii) is different from (iv) and the coating composition is substantially free of hydroxyl groups.