| http://www.w3.org/ns/prov#value | - The polystyrene resin (B) used in the invention is a homopolymer derived from an aromatic vinyl monomer represented by the formula ##STR2## wherein, Y denotes hydrogen or alkyl of 1 to 4 carbon atoms, Z denotes halogen or alkyl of 1 to 4 carbon atoms, and l denotes a number of 0 or 1 to 3, or is a copolymer derived from at least 50% by weight of said aromatic vinyl monomer and another vinyl monome
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