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专利名称：Increasing the efficiency of high molecular
weight crosslinked polycarboxylic acids
发明人：Walter Denzinger,Heinrich
Hartmann,Gerhard Faulhaber,Hans-JurgenRaubenheimer
申请号：US06/572244申请日：19840120公开号：US04525581A公开日：19850625
摘要：40The efficiency of high molecular weight crosslinked polycarboxylic acids whichare used as thickeners for neutral and alkaline aqueous systems and are obtained byprecipitation polymerization or suspension polymerization of a mixture of
(a) from 70 to 99.9% by weight of monoethylenically unsaturated carboxylic acids,
< P>(b) from 0.1 to 10% by weight of ethylenically diunsaturated or polyunsaturatedmonomers and
(c) from 0 to 20% by weight of other monoethylenically unsaturated monomers
at as high as 75° C. is increased by a process in which the copolymer is heated for from2 minutes to 5 hours at from 80° to 130° C. after the polymerization.
申请人：BASF AKTIENGESELLSCHAFT
代理机构：Oblon, Fisher, Spivak, McClelland & Maier
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