| http://www.w3.org/ns/prov#value | - The backing layer preferably also comprises, besides the reinforcing fillers, polypropylene, polyoxymethylene, polybutylene terephthalate or polystyrene, in particular styrene copolymers with subordinate proportions of one or more comonomers, such as butadiene, ??-methylstyrene, acrylonitrile, vinylcarbazole, or else esters of acrylic, methacrylic or itaconic acid.
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