Cationically co-curable polysiloxane release coatings

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

1996-11-12

1998-05-19

Berman, Susan W.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428152, 4284255, 4284256, 428447, 428451, 442 71, 442 72, 522148, 427458, 427515, 427516, B32B 904, C08J 704

Patent

active

057533466

ABSTRACT:
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 the following formula: ##STR1## 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 functional 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 0.2 a;
a is an integer of about 10 to about 1000; and
M is a silyl group which must contain at least one cationically 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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