Appeal No. 2003-2060
Application No. 09/133,691 Page 2
appealed claim 1; and (C) a specified amount of a nonionic alpha,
beta ethylenically unsaturated monomer as set forth in appealed
claim 1. Appealed claim 1 is reproduced below.
1. A hydrophobe-containing alkali soluble or
swellable copolymer thickener which provides aqueous
compositions with constant or incresed viscosity at
temperatures approaching 120°C, wherein said copolymer
comprises an emulsion polymerization product of:
(A) from about 0.1 to about 25 weight percent,
based on the total weight of the coploymer, of 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
wherein 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 arylalkl group wherein the
alkyl group has from 1 to 4 carbon atoms;
(B) from about 20 to about 70 weight percent,
based on the total weight of the copolymer, of an ",
$-ethylenically unsaturated monocarboxylic acid
monomer having the formula
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Last modified: November 3, 2007