| http://www.w3.org/ns/prov#value | - As the vinyl aromatic monomer, there can be mentioned monomers represented by the following formula: ##STR1## wherein R1 stands for a hydrogen atom, a lower alkyl group (having up to 4 carbon atoms) or a halogen atom, R2 stands for a substituent such as a lower alkyl group or a halogen atom, and n is an integer of up to 2 inclusive of zero,
|
