An alkylated crosslinked polymer comprising the reaction product of:a) one or more crosslinked polymers, salts or copolymers thereof characterized by a repeat unit selected from the group consisting of: ##STR6## where n is a positive integer and each R, independently, is H or a C1 -C8 alkyl group; and b) at least one aliphatic alkylating agent, said reaction product characterized in that:(i) at le