| http://www.w3.org/ns/prov#value | - The method of claim 42 wherein said polymer is reacted with at least two alkylating agents, one of said alkylating agents having the formula RX where R is a C4 -C20 alkyl group and X is one or more electrophilic leaving groups, and the other of said alkylating agents having the formula R'X where R' is a C1 -C20 alkyl ammonium group and X is one or more electrophilic leaving groups.
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