Method for producing aqueous styrene-butadiene polymer...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...

Reexamination Certificate

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C526S087000, C526S340000

Reexamination Certificate

active

10491271

ABSTRACT:
A process for preparing an aqueous styrene-butadiene polymer dispersion by free-radical aqueous emulsion polymerization of a monomer mixture M containing from 40 to 80% by weight of styrene as monomer M1, from 20 to 60% by weight of butadiene as monomer M2, and from 0 to 40% by weight, based on 100% by weight of monomers, of ethylenically unsaturated comonomers M3 other than styrene and butadiene by a monomer feed technique in the presence of from 0.05 to 0.5% by weight, based on 100% by weight of monomers, of at least one hydrocarbon HC selected from compounds having 6 to 20 carbon atoms which on abstraction of a hydrogen atom form a pentadienyl radical or a 1-phenylallyl radical and from α-methylstyrene dimer comprises supplying the monomers to be polymerized to the polymerization reaction over the course of 3 hours.

REFERENCES:
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patent: 5700852 (1997-12-01), Iwanaga et al.
patent: 5703157 (1997-12-01), Fujiwara et al.
patent: 195 12 999 (1995-10-01), None
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patent: 44 35 422 (1996-04-01), None
patent: 44 35 423 (1996-04-01), None
patent: 0 407 059 (1991-01-01), None
patent: 0 666 274 (1995-08-01), None
Ullmann's Encyclopedia of Industrial Chemistry, 5th, Completely Revised Edition, on CD-ROM, Rubber, 3. Synthetic, vol. A 23, pp. 249-251. 1993.

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