| http://www.w3.org/ns/prov#value | - Examples of cationic quaternary nitrogen centres which can be present in the polymeric pretreatment agent include: -N+(R)3 where each R is an alkyl group particularly a C1 to C4 alkyl e.g. methyl group, although one or more of the R groups may be a longer chain alkyl group e.g. a C6 to C18 alkyl group, or where two of the groups R together with the nitrogen atom bearing them form a heterocyclic ri
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