Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2007-03-27
2007-03-27
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...
C526S207000, C526S347000, C526S348600
Reexamination Certificate
active
10491336
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 having 6 to 20 carbon atoms selected from compounds which on abstraction of a hydrogen atom form a pentadienyl radical or a 1-phenylallyl radical and α-methylstyrene dimer comprises raising, at a point in time when at least 70% of the monomers to be polymerized have been supplied to the polymerization reaction, the concentration of butadiene in the monomer feed for a period of at least 1% of the total feed time by at least 10% by weight, based on monomers in the feed.
REFERENCES:
patent: 5637644 (1997-06-01), Tsuruoka et al.
patent: 195 15 999 (1995-10-01), None
patent: 44 19 518 (1995-12-01), None
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: 1 065 225 (2001-01-01), None
Ullmann's Encyclopedia of Industrial Chemistry, 5th, Completely Revised Edition, On CD-ROM, Sythetic Rubber, 2.2.1., 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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