Method for making polymodal aqueous synthetic resin dispersions

Details Method for making polymodal aqueous synthetic resin dispersions Method for making polymodal aqueous synthetic resin dispersions

1985-03-04

1985-09-03

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524460, C08J 306

Patent

active

045393613

ABSTRACT:
A method for making an aqueous polymodal synthetic resin dispersion by the emulsion polymerization of an ethylenically unsaturated monomer difficultly soluble in water, or a mixture of such monomers forming a polymer which is water insoluble under the conditions of polymerization, in an aqueous phase containing an emulsifier and a water soluble polymerization initiator, which method comprises adding a seed latex to the polymerization mixture in the course of the emulsion polymerization before more than 40 weight percent of said monomers have been polymerized, the particles of said seed latex being smaller by a factor ranging from 2 to 15 than are particles already formed by emulsion polymerization, the amount by weight of the particles in the seed latex being not greater than 10 percent by weight of the monomers and the ratio by weight of particles of said seed latex to the weight of the monomers already polymerized being from 1:4 to 1:500.

REFERENCES:
patent: 3485808 (1969-12-01), Wiesner
patent: 3509237 (1970-04-01), Aubrey
patent: 3547857 (1970-12-01), Murray
patent: 4046839 (1977-09-01), Papetti
patent: 4245070 (1981-01-01), Kemp
patent: 4254004 (1981-03-01), Abbey
patent: 4273895 (1981-06-01), Minematsu
patent: 4418183 (1983-11-01), Chiang

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