Document Type and Number:
Japanese Patent JPS5740162
Kind Code:
B2
Abstract:
There is disclosed improved resinous butadiene/styrene reinforcing copolymers prepared by a two step emulsion polymerization process comprising the steps of (A) polymerizing, under aqueous emulsion polymerization conditions, a first monomeric mixture of butadiene and styrene in the presence of water, polymerization initiator, molecular weight modifier and emulsifier to obtain a first butadiene/styrene copolymer latex and (B) adding to and polymerizing in said first copolymer latex a second monomer mixture of butadiene and styrene in the presence of water, polymerization initiator, molecular weight modifier and emulsifier wherein the monomeric mixture polymerized in step (A) ranges from 5 to 32 percent higher in styrene content than the monomeric mixture added and polymerized in step (B).
Application Number:
JP14400674A
Publication Date:
August 25, 1982
Filing Date:
December 14, 1974
Export Citation:
International Classes:
C08F2/00; C08F2/22; C08F2/38; C08F236/00; C08F236/10; C08F257/02