Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Reexamination Certificate
2011-08-23
2011-08-23
Egwim, Kelechi C (Department: 1762)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C526S213000, C526S227000, C526S317100, C526S318600
Reexamination Certificate
active
08003716
ABSTRACT:
Aqueous polymer dispersions based on copolymers of vinyl aromatics and conjugated aliphatic dienes having a mean particle size of from 80 to 150 nm, obtained by free radical emulsion copolymerization of(a) from 19.9 to 80 parts by weight of at least one vinyl aromatic compound,(b) from 19.9 to 80 parts by weight of at least one conjugated aliphatic diene,(c) from 0.1 to 10 parts by weight of at least one ethylenically unsaturated acid, and(d) from 0 to 20 parts by weight of at least one other monoethylenically Unsaturated monomer,the sum of the parts by weight of the monomers (a), (b), (c) and (d) always being 100, in an aqueous medium in the presence of at least one degraded starch having an intrinsic viscosity ηiof less than 0.07 dl/g with the use of at least 0.9% by weight, based on the monomers used altogether, of initiators selected from peroxodisulfates, peroxosulfates, azo initiators, organic peroxides, organic hydroperoxides and hydrogen peroxide, at least 30% by weight of the initiators being initially taken together with the degraded starch in the aqueous medium and the monomers and the remaining initiators being metered into this initially taken mixture under polymerization conditions.
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Arens Guillermo
Evstatieva Elitsa
Lawrenz Dirk
Minderhoud Johannes Jan-Bessel
Schmidt-Thuemmes Juergen
BASF SE
Egwim Kelechi C
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
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