C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/9043
C08F 6/14 (2006.01) C08F 220/12 (2006.01) C08J 3/02 (2006.01) C08J 3/09 (2006.01)
Patent
CA 1163033
PREPARATION OF COPOLYMER DISPERSIONS HAVING A NARROW PARTICLE SIZE DISTRIBUTION, AND EXHIBITING DILATANT FLOW OVER A BROAD RANGE OF CONCENTRATIONS Abstract of the Disclosure A process for the preparation of copolymer dispersions having a narrow particle size distribution, and exhibiting dilatant flow over a broad range of concentra- tions, by emulsion copolymerization of from 1 to 10 percent by weight, based on total monomers, of .alpha.,.beta.-mono-olefinically unsaturated monocarboxylic acids and/or dicarboxylic acids with other mono-olefinically unsaturated monomers and with from 0 to 5 percent by weight of polyolefinically unsaturated monomers in the presence of conventional emulsifiers, dispersants and polymerization initiators, and in the presence or absence of regulators, wherein the monomers are copolymerized in aqueous emulsion, with simultaneous agglomeration but only partial fusion of the initially formed polymer particles, at a temperature near the glass transition temperature of the copolymer formed, and thereafter A) the copolymer content of the aqueous copolymer dispersion is brought to 35 to 55 percent by weight an the pH to 3 to 5, or B) the water contained in the aqueous copolymer dispersion is entirely or partially replaced by a water- miscible liquid which does not dissolve or swell the copolymer.
381041
Distler Dieter
Welzel Gerhard
Wolf Hans
Basf Aktiengesellschaft
Robic Robic & Associes/associates
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