Acrylic emulsion copolymers for thickening aqueous systems and copolymerizable surfactant monomers for use therein
USRE33008E · kind E · reissue
11Cited by
7References
26Claims
0Family size
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Key dates
| Filing date | Jun 13, 1988 |
| Grant date | Aug 1, 1989 |
| Priority date | — |
| Expiry date | Jun 13, 2008 |
Classification
- Technology area (CPC —)General
Abstract
Acrylic emulsion copolymers are prepared by emulsion polymerization of (A) a surfactant monomer, (B) an .alpha..beta.-ethylenically unsaturated carboxylic acid monomer, (C) a nonionic.alpha..beta.-ethylenically unsaturated monomer and (D) optionally a polyethylenically unsaturated cross-linking monomer. The surfactant monomer is prepared by condensing a polyhydric alcohol or primary amine-containing nonionic surfactant with a monoethylenically unsaturated monoisocyanate. At a low pH the copolymer may be in the form of an aqueous dispersion or latex, but thickens upon neutralization of at least some of the carboxyl groups.
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