High temperature viscosity stable thickener

B - Operations – Transporting – 01 – F

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B01F 17/52 (2006.01) C08F 2/22 (2006.01) C08F 12/08 (2006.01) C08F 20/06 (2006.01) C08F 28/02 (2006.01) C08F 214/04 (2006.01) C08F 216/16 (2006.01) C08F 216/18 (2006.01) C08F 218/08 (2006.01) C08F 218/10 (2006.01) C08F 220/04 (2006.01) C08F 220/06 (2006.01) C08F 220/10 (2006.01) C08F 220/28 (2006.01) C08F 220/42 (2006.01) C08F 220/54 (2006.01) C08L 25/00 (2006.01) C08L 25/06 (2006.01) C08L 27/06 (2006.01) C08L 27/08 (2006.01) C08L 31/02 (2006.01) C08L 33/02 (2006.01) C08L 33/06 (2006.01) C08L 33/18 (2006.01

Patent

CA 2280170

A hydrophobe-containing alkali soluble or swellable copolymer thickener comprising an emulsion polymerization product of (A) an ethylenically unsaturated copolymerizable surfactant monomer having a cloud point of from about 65°C to about 95°C, wherein the surfactant monomer has the formula M(EO)x(PO)y(BO)zOR1 wherein M is a residue selected from the group consisting of an ethylenically unsaturated carboxylic acid, ethylenically unsaturated dicarboxylic acid, and a copolymerizable isocyanate; EO is an ethylene oxide unit; PO is a propylene oxide unit; BO is a butylene oxide unit; x is from 10 to 45; y is from 0 to 35; z is from 0 to 35; provided that x + y + z is from 20 to 45; and R1 is selected from the group consisting of alkyl, alkylene, cycloalkyl, cycloalkylene, and arylalkyl group wherein the alkyl group has 1 to 30 carbon atoms; (B) an .alpha., .beta.-ethylenically unsaturated monocarboxylic acid monomer; and (C) a nonionic .alpha., .beta.-ethylenically unsaturated monomer. The copolymer provides aqueous compositions with constant or increased viscosity at temperatures approaching 120°C.

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