Patent ID: 7482061
Filing Date: 2009-01-27
Classification: C08G,C09D,Y10T

Abstract:
1. A moisture curable coating composition comprising a reaction mixture said reaction mixture comprising: a) a silicone resin in the amount of 10 to 45 percent by weight based on the total weight of the composition and having the formula: where M=R D=R T=R Q=SiO where the subscripts a is positive b, c, and dare zero or positive and are chosen so that the resin has a viscosity, based on a 50 percent by weight solids solution in an aromatic solvent, varying between about 5 centistokes and 10,000 centistokes where each R b) a siloxane polymer in the amount 0.5 to 15 percent by weight based on the total weight of the composition and having the formula: where M=R D=R T=R where the subscripts e and f are positive, g is zero, and e, f and g are chosen so that the polymer has a viscosity varying between about 10 centistokes and 2,000,000 centistokes where each R 7 is independently selected from the group of hydrogen, hydroxyl, and monovalent alkyl, haloalkyl, aryl, halo-aryl, alkylaryl and halo-alkylaryl radicals containing from 1 to 60 carbon atoms, R 8 , R 9 , R 10 , R 11 and R 12 is independently selected from the group of hydrogen, and monovalent alkyl, haloalkyl, aryl, halo-aryl, alkylaryl and halo-alkylaryl radicals containing from 1 to 60 carbon atoms, subject to the limitation that at least one of R 7 is hydroxyl; c) a silazane in the amount of 5 to 30 percent by weight based on the total weight of the composition and having the formula: where M′=R D′=R T′=R Q′=Si(NH) where the subscripts k, l, m and n are zero or positive, where each R 13 , R 14 , R 15 , R 16 , R 17 and R 18 is independently selected from the group of monovalent alkyl, alkenyl, halo-alkyl, halo-alkenyl, aryl, halo-aryl, alkylaryl, alkenylaryl, halo-alkylaryl, and halo-alkenylaryl radicals containing from 1 to 60 carbon atoms, subject to the limitations that the sum of k, l, m and n is 3 or greater and said silazane is present in an amount wherein the silazane groups initially present due to said silazane are present in excess of stoichiometric relative to the amount of hydroxyl groups initially present due to said silicone polymer and said silicone resin by a factor of 2 to 30; and d) a curing catalyst in the amount of 0.002 to 0.02 percent by weight based on the total weight of the composition; whereby the ammonia produced as a by-product of the reaction is removed from the reaction mixture.