| 摘要 |
PURPOSE:To produce a transparent resin having high refractive index and low dispersion, by reacting a lanthanoid metal or yttrium salt of a mercapto- containing carboxylic acid with an epoxy-containing vinyl monomer and thermally curing the reaction product. CONSTITUTION:(A) 10-70(wt)% lanthanoid metal or yttrium salt of a mercapto- containing carboxylic acid [preferably a reaction product of a lanthanoid metal oxide or yttrium oxide with the compound of formula HSCnH2nCOOH (n is 1-5)] is mixed and made to react with (B) 30-90% vinyl monomer having epoxy group [e.g. the compound of formula (X is H or CH3)] or a mixture of said monomer and other copolymerizable monomer and the reaction product is cured with heat. USE:An optical material for the parts such as lens, prism, filter, etc.
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