Water-swellable hydrophilic polymers

Details Water-swellable hydrophilic polymers Water-swellable hydrophilic polymers

1996-07-18

1997-11-04

Zitomer, Fred

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526200, 5262181, 526277, 526278, 526286, 526287, 526288, 5263031, 526304, C08F 2058, C08F 436

Patent

active

056841043

ABSTRACT:
Method for avoiding network defects due to unwanted secondary reactions during the polymerization in water-swellable hydrophilic polymers which contain polymers prepared by free radical (co)polymerization of one or more hydrophilic monomers of the formula I ##STR1## wherein R.sup.1 is hydrogen, methyl or ethyl,
R.sup.2 is the group --COOR.sup.4, the sulphonyl group, the phosphonyl group, the phosphonyl group-esterified by (C.sub.1 -C.sub.4)-alkanol or a group of the formula ##STR2## R.sup.3 is hydrogen, methyl, ethyl or the carboxyl group, R.sup.4 is hydrogen, amino or hydroxy-(C.sub.1 -C.sub.4)-alkyl and
R.sup.5 is the sulphonyl group, the phosphonyl group or the carboxyl group, or grafting (co)polymerization of one or more hydrophilic monomers of the formula I onto a grafting base, using a free radical initiator which forms three or more free radical sites per molecule.

REFERENCES:
patent: 4777230 (1988-10-01), Kamath
patent: 5039754 (1991-08-01), Sanchez
patent: 5219969 (1993-06-01), Uhl
patent: 5254650 (1993-10-01), Fukumura
patent: 5258465 (1993-11-01), Suyama

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