| 摘要 |
A release coating composition comprising: a) a polydiorganosiloxane having at least one reactive hydrolyzable group alpha connected to a silicon atom, wherein R<3> is a monovalent alkyl group with about 1 to 3 carbon atoms; Z is a monovalent moiety selected from the group consisting of -OR and -R wherein R is an alkyl group having about 1 to 3 carbon atoms; Y is a divalent alkylene linking group comprising about 1 to 12 carbon atoms; Q is a divalent linking group selected from urea, amide, urethane, thiourethane, ether and thioether; t is an integer from 0 to 10; and X is a divalent alkylene linking group comprising about 1 to 12 carbon atoms; b) a component selected from the group of compounds of the general formula (R<3>O)3 - Si - A, hydrolysates thereof, and mixtures thereof, wherein R<3> is as previously defined; A is a monovalent moiety selected from the group consisting of -OR<3>, alkyl group with about 1 to 20 carbon atoms, and -X-(Q)p - [D-Q]t - (Y)b - SiCOR<3>)3 wherein X, Q, t, Y and R<3> are as previously defined; D is a divalent group selected from alkylene groups with about 2 to 30 carbon atoms; aralkylene groups with about 6 to 30 carbon atoms; arylene groups with about 6 to 30 carbon atoms; and divalent polymeric segments having a number average molecular weight of about 500 to 10,000 selected from polyether, polyolefin, polyester, polydiene, and mixtures thereof; p is 0 or 1; b is 0 or 1; wherein when t is an integer of 1 to 10, b must equal 1 and p must equal 1; wherein when t=0 and b=0, p must also equal 0; and c) a component selected from acids having pKa less than about 3, anhydrides of acids having pKa less than about 3, ammonium and lower alkyl ammonium salts of acid having pKa less than about 3, and mixtures thereof. The release coating composition of the invention has excellent shelf stability and pot life and cures rapidly, completely and reliably in atmospheric moisture in a controllable manner when coated on a variety of substrates. |
