| http://www.w3.org/ns/prov#value | - The vinyl chloride copolymers preferably include epoxy-containing vinyl chloride copolymers, such as those comprising a vinyl chloride repeating unit, an epoxy-containing repeating unit and, if desired, a repeating unit containing a polar group, e.g., --SO3 M, --OSO3 M, --COOM, and --PO(OM)2, wherein M is a hydrogen atom or an alkali metal.
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