Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2007-10-16
2007-10-16
Egwim, Kelechi C. (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
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.
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Ullmann's Encyclopedia of Industrial Chemistry, 5th, Completely Revised Edition, on CD-ROM, Rubber, 3. Synthetic, vol. A 23, pp. 249-251. 1993.
Gaschler Wolfgang
Kroener Hubertus
Manders Lambertus
Wirth Thomas
BASF - Aktiengesellschaft
Egwim Kelechi C.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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