Patent ID: 6824881
Filing Date: 2004-11-30
Classification: C08G,C09D,Y10T

Abstract:
Thermoplastic silicone block copolymers comprising(A) a hard segment polymer component comprising a polymer prepared from monomers selected from the group consisting of styrene, methyl methacrylate, butyl acrylate, acrylonitrile, vinyl monomers, and mixtures thereof, and (B) a soft segment polymer component of the general formula G-[(SiR2O)mSiR2â€”Xâ€”]n(SiR2O)mSiR2-Gâ€ƒâ€ƒ(I) where each R is an identical or different monovalent, optionally halogenated hydrocarbon radical having 1 to 18 carbon atoms per radical, each X independently is a divalent radical selected from the group consisting of the radicals of the formula each G is an identical or different radical (A)-Z-(Si) or Zâ€²-(Si),where Z is a divalent radical selected from the group consisting of radicals of the formula where (A)- is a bond to the hard segment polymer component (A) and (Si)â€” is a bond to the silicon atom in (B), with the proviso that in the formula (I) not more than one radical G can be a radical Zâ€², m is an integer from 1 to 1000, and n is 0 or an integer from 1 to 20, with the proviso that if n is not 0 then for the product of n and m, 4&lE;nÂ·m&lE;1000.