Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1988-11-30
1989-12-05
Bleutge, John C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524458, 524460, 525291, 525292, 525293, 525295, 525296, 525301, 525303, 525304, 525308, 525902, C08F26706, C08L 5100
Patent
active
048853208
ABSTRACT:
Polymer opaque particles and a process for making same are disclosed. These particles comprise an emulsion polymerized core copolymer having, as one constituent thereof, between about 15% and about 40% by weight of a monomer having the general formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.4 are independently selected from hydrogen, nitro, amino nitrile, hydroxyl and halogen groups, and organic radicals such as substituted or unsubstituted alkyl, cycloalkyl or aryl groups, R.sub.3 is selected from hydrogen or substituted or unsubstituted organic radicals such as alkyl, cycloalkyl or aryl groups and A is an organic or inorganic bridge connecting the illustrated atoms, the remainder being a mixture of selected olefinically unsaturated acid and ester monomers, said core particles, in turn being encapsulated with an emulsion polymerized sheath copolymer comprised of one or more nonionic olefinically unsaturated monomers to produce said opaque particles. In the present invention, the core polymer resulting from the polymerization of the above-described monomer has a structure in which ##STR2## is a pendant functional group. The finished particles have an average diametric particle size ranging from about 70 to about 4500 nm. and are free of internal microvoids. The present invention further comprises compositions such as paints and paper coatings containing said particles.
REFERENCES:
patent: 4427836 (1984-01-01), Kowalski
patent: 4829102 (1989-05-01), Biale
Bleutge John C.
Buttner David
Union Oil Company of California
Wirzbicki Gregory F.
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