Patent ID: 6197906
Filing Date: 2001-03-06
Classification: C07C,C08F

Abstract:
A crosslinked polymer gel comprising a asymmetrical crosslinking moiety of the formula: ##STR17##wherein X and X' are independently selected from the group consisting of --O--, --S-- and --NR--, where R is H, alkyl or cycloalkyl,Y is an optionally substituted non-aromatic divalent linking group,Z is O or S; andR.sub.2 is a C.sub.1 -C.sub.4 alkyl group,provided that when said crosslinked polymer gel is a non-aqueous polymer gel and R.sub.2 is CH.sub.3 and Y is --CH.sub.2 --CH.sub.2 --, X, X' and Z are not all O.