Resinous butadiene/styrene reinforcing copolymers

Details Resinous butadiene/styrene reinforcing copolymers Resinous butadiene/styrene reinforcing copolymers

C - Chemistry, Metallurgy

08

F

402/453

C08F 212/08 (2006.01) C08F 236/06 (2006.01) C08F 257/02 (2006.01)

Patent

CA 1038547

Inventors: Lloyd D. Hess William C. Mast IMPROVED RESINOUS BUTADIENE/STYRENE REINFORCING COPOLYMERS Abstract of the Disclosure 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).

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