Process for preparing styrene-butadiene rubber

Details Process for preparing styrene-butadiene rubber Process for preparing styrene-butadiene rubber

C - Chemistry, Metallurgy

08

L

C08L 9/08 (2006.01) C08F 36/04 (2006.01)

Patent

CA 2158106

This invention discloses a process for preparing a latex of styrene-butadiene rubber which comprises (1) charging water, a soap system, a free radical generator, 1,3-butadiene monomer, and styrene monomer into a first polymerization zone; (2) allowing the 1,3-butadiene monomer and the styrene monomer to copolymerize in the first polymerization zone to a monomer conversion which is within the range of about 15% to about 40% to produce a low conversion polymerization medium; (3) charging the low conversion polymerization medium into a second polymerization zone; (4) charging an additional quantity of 1,3- butadiene monomer and an additional quantity of styrene monomer into the second polymerization zone; (5) allowing the copolymerization to continue until a monomer conversion of at least about 50% is attained to produce the latex of styrene-butadiene rubber. This technique can also be utilized to synthesize polybutadiene latex or nitrile rubber latex by emulsion polymerization with low levels of soap.

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