Process for preparing styrene-butadiene rubber

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

1995-04-10

1996-12-10

Mulcahy, Peter D.

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...

524836, 526 65, C08F 216

Patent

active

055831737

ABSTRACT:
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.

REFERENCES:
patent: 2794126 (1961-03-01), Kelley
patent: 4082714 (1978-04-01), Lo Scalzo et al.
patent: 4130523 (1978-12-01), Hoy et al.
patent: 4480078 (1984-10-01), Gujarathi et al.
patent: 4559374 (1985-12-01), Senyek et al.
patent: 5284905 (1994-02-01), Chen et al.
The Vanderbilt Rubber Handbook, George G. Winspear (Editor), R T Vanderbilt Company (1968) at pp. 34-57.

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