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专利名称：Cross-linked, water soluble copolymers,
process for their manufacture and usethereof
发明人：MOENCH, DIETMAR, DR.,STANGE, ANDREAS,
DR.,LIEBE, JOERG, DR.,HARTMANN,HEINRICH, DR.,MERGER, FRANZ,DR.,SCHWARTZ, MANFRED, DR.
申请号：EP118154.7申请日：190930公开号：EP03798A3公开日：19910731
摘要：Bridged, water-soluble copolymers are obtainable by
(A) copolymerization of a monomer mixture of
(a) from 50 to 99 mol % of acrylamide and/or methacrylamide,
< P>(b) from 50 to 1 mol % of a monoethylenically unsaturated monomer containingactual groups and
(c) from 0 to 20 mol % of monomers which differ from (a) and (b),
in the presence of a polymerization initiator under conditions such that the acetalgroups of the monomers (b) undergo virtually no hydrolysis,
< P>(B) hydrolysis of the acetal groups of the monomers (b), present ascopolymerized units in the copolymers (A),
(C) condensation of the copolymers (B) containing aldehyde groups at a pH above 5,at most to a degree such that the resulting condensates are still water-soluble and
(D) stopping of the condensation reaction by adding acid until the pH reaches 3 orless,< P>
and are used as paper stock additives in papermaking for increasing the wet strengthof paper.
申请人：BASF AKTIENGESELLSCHAFT
地址：Carl-Bosch-Strasse 38 D-67063 Ludwigshafen DE
国籍：DE
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