C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 183/14 (2006.01) C08K 5/09 (2006.01) C09D 201/10 (2006.01) C09J 7/02 (2006.01)
Patent
CA 2128865
2128865 9316142 PCTABS00025 A release coating composition comprising: a) a polydiorganosiloxane having at least one reactive hydrolyzable group .alpha. connected to a silicon atom, wherein R3 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 (R3O)3 - Si - A, hydrolysates thereof, and mixtures thereof, wherein R3 is as previously defined; A is a monovalent moiety selected from the group consisting of -OR3, alkyl group with about 1 to 20 carbon atoms, and -X-(Q)p - [D-Q]t - (Y)b - SiCOR3)3 wherein X, Q, t, Y and R3 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.
Leir Charles M.
Sarkar Manisha
Sherman Audrey A.
Minnesota Mining And Manufacturing Company
Smart & Biggar
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