| 摘要 |
NEW MATERIAL:The thiol carboxylic acid ester of formula I (X is group of formula II, formula III or formula IV). USE:A raw material for plastics for optical use. It is a monomer giving a three- dimensionally crosslinked resin having high refractive index, excellent transparency and good workability e.g. by cutting, polishing, etc. The polymer and oligomer of the monomer can be used also as an adhesivity improver for metal and glass. PREPARATION:The compound of formula I can be produced by reacting a dithiol derivative of formula V with a methacrylic acid derivative of formula VI (Y is Cl, Br, OH or 1-4C alkoxy) in an inert solvent (e.g. methylene chloride) in the presence of a base (e.g. NaOH), tetrabutylammonium bromide and phenothiazine.
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