| http://www.w3.org/ns/prov#value | - copolymers of one or more suitable crosslinking agents with styrene (and/or substituted styrenes such as vinyl toluene, ethyl vinyl benzene, alpha methyl styrene or a halo methyl styrene) which copolymers have been reacted to form or introduce halo methyl groups (if not already present) and subsequently converted to primary, secondary and/or tertiary amines with for example ammonia, methyl amine,
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