| http://www.w3.org/ns/prov#value | - 6 are, independently, an alkyl group of 1 to 3 carbon atoms, or (ii) R1 forms, together with the 2 nitrogen atoms and R2, R3, R5 and R6 in the formula a group of the formula ##STR45## wherein R2, R3, R5 and R6 are, independently, an alkyl group of 1 to 3 carbon atoms, R4 has the same meaning as above (i) , X1 --is a halogen atom, and m is an integer of 5 to 500, and (b1) an aqueous solution of an
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