| http://www.w3.org/ns/prov#value | - Said polymerizable monomers (b) include acrylic acid or methacrylic acid esters represented by the following general formula: ##STR1## wherein R1 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, and R2 an alkyl group or substituted alkyl group having 1 to 16 carbon atoms; styrene or its derivatives; vinyl acetate, acryl amide, methacryl amide, acrylonitrile, methacrylonitrile, etc.
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