Patent ID: 6177481
Filing Date: 2001-01-23
Classification: B01D

Abstract:
A defoamer emulsion comprising:A) at least one polysiloxane defoamer,B) at least one emulsifier which is selected from the group consisting of anionic emulsifiers, cationic emulsifiers and nonionic emulsifiers selected from the group consisting of ethylene oxide/propylene oxide block copolymers, fatty acid polyglycol esters, lecithin, lanolin, saponin, cellulose, cellulose alkyl ethers and carboxyalkylcellulose, the alkyl groups of which have up to 4 carbon atoms,C) at least one nonionic surfactant of the formula:R--[T--(Q').sub.w --H].sub.y,in which R is: ##STR9##wherein q is a number between 0.5 to 2.8,T is oxygen or a residue of the formula: ##STR10##Q' denotes alkylene oxide units, providing that at least 70 mol % of said units are ethylene oxide,z is a number from 1 to 300,y is a number from 1 to 20, andw is a number from 1 to 300,D) at least one polyurethane thickener having a weight average molecular weight of 5,000 to 60,000, andE) water.