Patent ID: 7449536

Claim:
A method comprising heating in the presence of a cyclosiloxane ring opening polymerization catalyst, a mixture comprising (i) a reaction product obtained by mixing in the presence of a platinum group metal-containing catalyst at least one organohydrogensilicon compound containing at least one silicon-bonded hydrogen atom per molecule and at least one compound having at least one aliphatic unsaturation; where the organohydrogensilicon compound is described by formula where each R is independently selected from a hydrogen atom and a monovalent hydrocarbon group comprising 1 to 20 carbon atoms which is free from aliphatic unsaturation, a is an integer from 1 to 18, b is an integer from 1 to 19, a +b is an integer from 3 to 20, each X is an independently selected functional group selected from a halogen atom, an ether grout, an alkoxy group, an alkoxyether group, an acyl group, a silyl group, or a —Z—R 4 where each Z is independently selected from an oxygen and a divalent hydrocarbon group comprising 2 to 20 carbon atoms, each R 4 group is independently selected from —BR u Y 2- u , —SiR v Y 3-v , or a group described by formula (II): (Y 3-n R n SiO 1/2 ) c (Y 2-o R o SiO 2/2 ) d (Y 1-p R p SiO 3/2 ) e (SiO 4/2 ) f (CR q Y 1-q ) g (CR r Y 2-r ) h (O(CR s Y 2-s )) i (CR t Y 3-t ) j (II) where B refers to boron, each R is as described above, the sum of c+d+e+e+f+g+h+i+j is at least 2, n is an integer from 0 to 3, o is an integer from 0 to 2, p is an integer from 0 to 1, q is an integer from 0 to 1, r is an integer from 0 to 1, s is an integer from 0 to 2, t is an integer from 0 to 3, u is an integer from 0 to 2, v is an integer from 0 to 3, each Y is an independently selected functional group selected from a halogen atom, an ether group an alkoxy group an akloxyether group, an acyl group, a silyl group, or a Z—G group, where Z is as described above, each G is a cyclosiloxane described by formula (III): where R and X are as described above, k is an integer from 0 to 18, m is an integer from 0 to 18, k+m is an integer from 2 to 20, provided in formula (II) that one of the Y groups is replaced by the Z group bonding the R 4 group to the cyclosiloxane of formula (I), and provided further at least one X group of Formula (I) is a —Z—R 4 group; (ii) at least one endblocker described by formula (IV) R′ 3 SiO(MeR′SiO) z SiR′ 3 , where z ranges from 0 to 150 and each R′ is independently chosen from alkyl, aryl, alkenyl, dienyl or functional alkyls where the functionality may be fluoro, fluoroether, polyether, ether, aryl, silyl, siloxy, carboxy, glycosidyl or acrylate, and optionally (iii) at least one organosiloxane ebosen from a hydrolyzate described by formula (V) HO(MeR′SiO) y′ H and a cyclosioxane described by formula (VI) (MeR′SiO) y where y is an integer from 3 to 30, y′ is an integer from 1 to 500, and each R′ is as described above; so to cause polymerization of components (i), (ii), and optionally (iii) to form branched polymers.