Patent ID: 6072012
Filing Date: 2000-06-06
Classification: C08G

Abstract:
An ultra-high molecular weight MQ resin comprising the copolymerized reaction product of:(A) a solid MQ resin having weight average molecular weight less than 100,000 and having M and Q units of empirical formulaR.sup.1.sub.a R.sup.2.sub.b R.sup.3.sub.c SiO.sub.(4-a-b-c)/2wherein: R.sup.1 is a hydroxyl group, R.sup.2 is a monovalent hydrocarbon group having at least one unsaturated carbon-carbon bond that is capable of addition reaction with a silicon-bonded hydrogen atom; each R.sup.3 is independently selected from the group consisting of alkyl, aryl and arylalkyl groups, a is a number from 0 to 0.2, b is number from 0 to 1.5, and c is a number greater than or equal to 0, with the provisos that: 1>a+b+c>1.5; and when b is less than 0.02, then a is greater than or equal to 0.07; and when a is less than 0.07, then b is greater than 0.02; and(B) a substantially linear polydiorganosiloxane having empirical formula:(R.sup.4.sub.(3-p) R.sup.5.sub.p SiO.sub.1/2)(R.sup.4.sub.2 SiO.sub.2/2).sub.x ((R.sup.4 R.sup.5 SiO.sub.2/2)(R.sup.4.sub.2 SiO.sub.2/2).sub.x).sub.y (R.sup.4.sub.(3-p) R.sup.5.sub.p SiO.sub.1/2)wherein each R.sup.4 is a monovalent group independently selected from the group consisting of alkyl, aryl, and arylalkyl groups, each R.sup.5 is a monovalent group independently selected from the group consisting of hydrogen, hydroxyl, alkoxy, oximo, alkyloximo, and aryloximo groups, p is 0, 1, 2 or 3, x is 0 to 100, y is 0 to 100 with the provisos that at least two R.sup.5 groups are present in each molecule, at least two of the R.sup.5 groups are bonded to different silicon atoms within the molecule, and each molecule of the substantially linear polydiorganosiloxane has a degree of polymerization of at least 5;andwherein amounts of component (A) and (B) are selected such that the copolymerized reaction product has a weight average molecular weight of at least 100,000, and the copolymerized reaction product of (A) and (B) is soluble in at least one organic solvent.