Cationically co-curable polysiloxane release coatings

Details Cationically co-curable polysiloxane release coatings Cationically co-curable polysiloxane release coatings

C - Chemistry, Metallurgy

09

D

C09D 183/04 (2006.01) B05D 3/06 (2006.01) C09D 4/06 (2006.01) C09D 183/06 (2006.01) C09D 183/08 (2006.01) C09D 183/10 (2006.01) C09J 7/02 (2006.01)

Patent

CA 2144643

The invention provides a radiation curable release coating composition comprising: (a) about 1 to about 50 percent by weight of a cationically reactive polydiorganosiloxane liquid rubber having formula (I) wherein R are monovalent moieties which can be the same or different selected from the group consisting of alkyl, substituted alkyl, aryl, and substituted aryl wherein at least about 50 % of the total number of silicon atoms have two methyl groups bonded thereto; E is an organic monovalent func- tional group comprising from about 1 to about 20 carbon atoms having at least one cationically co-reactive functional group; a and b both represent integers, wherein the sum of a plus b is an integer of about 10 to about 1200; b has a value ranging from about 0 to about 0.2a; a is an integer of about 10 to about 1000; and M is a silyl group which must contain at least one cationical- ly co-reactive functional group when b=0 and may contain at least one cationically co-reactive group when b is greater than 0; (b) about 50 to about 99 percent by weight of at least one cationically co-reactive monomer copolymerizable with said cationically co-reactive functional group of said polydiorganosiloxane liquid rubber; wherein the percentages of (a) and (b) are based on the total weight of (a) plus (b); and (c) about 0.5 to about 4 parts by weight of a photoactive radiation activatable cationically reactive catalyst based on the weight of (a) plus (b). The invention also provides release coatings and methods of making release coatings.

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