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...
Reexamination Certificate
2005-02-15
2005-02-15
Zalukaeva, Tatyana (Department: 1713)
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...
C526S303100, C526S320000, C526S318200, C526S291000, C526S318410, C526S319000, C526S323000, C526S330000, C526S345000, C526S338000, C526S347000, C560S198000, C560S199000, C560S205000, C560S212000, C560S218000, C524S801000, C524S832000
Reexamination Certificate
active
06855762
ABSTRACT:
A process for the preparation of water-soluble polymers of esters of ethylenically unsaturated carboxylic acids and polyalkylene glycols by azeotropic esterification, in the presence of organic solvents which form an azeotrope with water, of ethylenically unsaturated carboxylic acids with polyalkylene oxides which are capped at one end by end groups, to a degree of at least 85 wt %, followed by free-radical polymerization of the resulting esters optionally together with other ethylenically unsaturated monomers, in aqueous medium, wherein the organic solvents are removed by azeotropic distillation from the reaction mixture during polymerization and the water that is removed by distillation is recycled or the quantity of water removed by distillation from the reaction mixture is replaced by a feed of fresh water.
REFERENCES:
patent: 4138381 (1979-02-01), Chang et al.
patent: 4429097 (1984-01-01), Chang et al.
patent: 6166112 (2000-12-01), Hirata et al.
patent: 0 884 290 (1998-12-01), None
Büchner Karl-Heinz
Faul Dieter
Kroner Matthias
Perner Johannes
Raubenheimer Hans-Jürgen
BASF - Aktiengesellschaft
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Zalukaeva Tatyana
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