| http://www.w3.org/ns/prov#value | - ing 20 mole% or more of monomer units of the general formula (III),wherein R1 is H or CH3, R2 and R3 are each an alkyl group of 1 to 2 carbon atoms, R4 is H or an alkyl group of 1 to 2 carbon atoms, A is an oxygen atom or NH and B is an alkylene group of 2 to 4 carbon atoms or a hydroxypropylene group and X is a counterion, the salt and the salt concentration is such that the polymer formed is pre
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