Patent ID: 6207722
Filing Date: 2001-03-27
Classification: B01D

Abstract:
A foam control composition comprising:(I) a polysiloxane; and(II) a resin-filler comprising the reaction product of:(A) a vinyl-functional MQ resin having an average general unit 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 bond between at least two adjacent carbon atoms 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 a number from 0.02 to 1.50, and c is a number from 0 to 1.48, with the proviso that 1.ltoreq.a+b+c.ltoreq.1.5; and(B) a substantially linear polydiorganosiloxane of empirical formula:(R.sup.4.sub.(3-p) H.sub.p SiO.sub.1/2)(R.sup.4.sub.2 SiO.sub.2/2).sub.x ((R.sup.4 HSiO.sub.2/2)(R.sup.4.sub.2 SiO.sub.2/2).sub.x).sub.y (R.sup.4.sub.(3-p) H.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, p is 0 or 1, x ranges from 0 to 70, and y ranges from 0 to 100, with the proviso that at least two silicon-bonded hydrogen atoms are present in each molecule; andwith the proviso that components (A) and (B) are present in amounts selected such that the reaction product thereof is insoluble in solvents; and(C) a catalyst.