Fluid-absorbing polymers, processes used in their production and their application

US5837789A · kind A · utility

Assignee

• Stockhausen GmbH & Co. KG · DE

Inventors

• Dolf Stockhausen · Krefeld, DE
• Hans-Georg Hartan · Kevelaer, DE
• Helmut Brehm · Krefeld, DE
• Gerd Jonas · Kempen, DE
• Bernfried Messner · Greensboro, US
• Klaus Pflueger · Eberdingen, DE

Key dates

• Filing date: Nov 20, 1996
• Grant date: Nov 17, 1998
• Expiry date: Nov 20, 2016

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01B3/30
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to superabsorbent cross-linked polymers for watery liquids, which are built-up of partially neutralized monomers having monoethylenlcally unsaturated acid groups, optionally further monomers copolymerizable therewith, as well as polymers optionally suitable as graft basis, and which can be manufactured by using a cross-linker/monomer combination of EQU CH.sub.2 .dbd.CHR.sup.6 --CO--(OCHR.sup.3 --CHR.sup.3).sub.z O--CH.sub.2 --CHR.sup.6 .dbd.CH.sub.2 EQU CH.sub.2 .dbd.CHR.sup.6 --R.sup.5 --(OCHR.sup.3 --CHR.sup.3).sub.v OR.sup.4 EQU R.sup.1 --O(CHR.sup.3 --CHR.sup.3 O).sub.u --CO--R.sup.2 !.sub.x, and/or di- or triallylamine and/or bisacrylamide with R.sup.1 : multivalent C2-10-alkyl, R.sup.2 : linear or branched C2-10-alkenyl, R.sup.3 : H, CH.sub.3, C.sub.2 H.sub.5, R.sup.4 : H, linear or branched C1-10-alkyl, R.sup.6 : CO, CH.sub.2 R.sup.8 : H, CH.sub.3 x: 2-6 u: 0-15 V: 1-45 z: 3-20 As compared with the state of the art, the polymers according to the present invention have an improved combination of the properties retention, liquid absorption under pressure at 63 g/cm.sup.2 and soluble contents, moreover, they have an Increased permeability of the ge…