C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/453
C08F 212/08 (2006.01) C08F 2/18 (2006.01) C08F 236/06 (2006.01) G03G 9/087 (2006.01)
Patent
CA 1249392
ABSTRACT A process for forming a copolymer of styrene and butadiene in which an aqueous mixture comprising water, styrene monomer, butadiene monomer, a suspension stabilizing agent, and a chain-propagating amount of a free radical polymerization initiator insoluble in water, soluble in the styrene monomer and soluble in the butadiene monomer is heated in an inert atmosphere to a temperature between about 50°C and about 130°C in the absence of redox initiators and mercaptan compounds until the monomers form an aqueous suspension of discrete copolymer particles having a Tg value of between about 45°C and 65°C and a weight average molecular weight of between about 10,000 and about 250.000. Increased molecular weight distribution of the final copolymer may be achieved by introducing additional styrene monomer, butadiene monomer, suspension stabilizing agent and initiator to the aqueous mixture at least once during the heating step. Optimum yields are achieved by heating the aqueous mixture with at least two different initiators in accordance with a predetermined multistage healing profile.
442096
Alexandru Lupu
Odell Peter G.
Sim & Mcburney
Xerox Corporation
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