| http://www.w3.org/ns/prov#value | - One such variation which may be conveniently employed when differently substituted quaternary amino groups are required in the polymeric allylammonium derivative D1, D2, D3 or D4 is to carry out the alkylation in two stages using first one and then the other required alkylating agent, for example first using appropriate amounts of the higher molecular weight alkylating agent and then of the lower
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