Extrudable, low-migration organic silicone copolymers of...

Stock material or miscellaneous articles – Composite – Of silicon containing

Reexamination Certificate

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C526S279000, C526S344000, C526S346000, C526S348000, C526S329700

Reexamination Certificate

active

07153581

ABSTRACT:
The invention provides organic silicone copolymers based ona) from 30 to 99% by weight of a vinylaromatic, (meth)acrylic ester, vinyl ester, olefin, diene, and/or vinyl halide monomer, andb) from 1 to 70% by weight of a mixture of at least two diorganopolysiloxanes having the general formula R1aR3-aSiO(SiR2O)nSiR3-aR1a, in which each R denotes a monovalent, optionally substituted, C1-18alkyl or C1-18alkoxy radical, R1denotes a polymerizable group, a is 0 or 1, at least one a being 1, and n is an integer, whereb1) from 5 to 65% by weight of the silicone component b) is a diorganopolysiloxane with n≦30 and only one terminal polymerizable group R1, andb2) from 35 to 95% by weight of the silicone component b) is a diorganopolysiloxane with n≧55 and with one or two terminal polymerizable groups R1.

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