High temperature viscosity stable thickener
US6762269B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 13, 1998 |
| Grant date | Jul 13, 2004 |
| Priority date | — |
| Expiry date | Oct 3, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2205/05
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
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 formulaM(EO)x(BO)zOR1wherein M is a residue selected from the group consisting of an ethylenically unsaturated carboxylic acid, and an ethylenically unsaturated dicarboxylic acid, EO is an ethylene oxide unit; BO is a butylene oxide unit; x is from 10 to 45; z is from 5 to 35; provided that x+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 4 carbon atoms; (B) an &agr;,&bgr;-ethylenically unsaturated monocarboxylic acid monomer; and (C) a nonionic &agr;,&bgr;-ethylenically unsaturated monomer. The copolymer provides aqueous compositions with constant or increased viscosity at temperatures approaching 120° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.