| http://www.w3.org/ns/prov#value | - further a copolymer of styrene and/or of such a styrene derivative, with one or more copolymerizable monomers such as acrylonitrile, methacrylonitrile, acrylic and methylacrylic acids and their alkyl esters, including methyl, ethyl and butyl esters; (b) a homopolymer or copolymer of the above listed types further including a small proportion of cross linking polyfunctional comonomers; (c) a mixtur
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