Patent ID: 6162330
Filing Date: 2000-12-19
Classification: B01D,D21H

Abstract:
A method for restricting air entrapment in white water of a paper making process which comprises the step of adding to said white water a polysiloxane having the formula:QR.sup.1.sub.2 SiO(R.sup.1 GSiO).sub.j (R.sup.1.sub.2 SiO).sub.k SiR.sup.1.sub.2 Qwherein each R.sup.1 is independently a monovalent hydrocarbon group having 1 to 30 carbon atoms, Q is selected from the group consisting of R.sup.1 and G, and G is selected from the group consisting of a radical having the average structure--D(OCH.sub.2)Zand a radical having the general structure--D'((OCH.sub.2)Z).sub.z-1wherein D is a divalent hydrocarbon radical having from 1 to 30 carbons atoms, D' is selected from tri and multi(z)valent hydrocarbon radicals having from 1 to 30 carbon atoms, Z is a substituent having one or more hydroxyl groups linked to carbon atoms, j has a value from 0 to 150 inclusive, provided that if j is 0, at least one of the groups Q is G, k has a value of from 0 to 1,500 or more and z denotes the valency of hydrocarbon D'.