| 摘要 |
PROBLEM TO BE SOLVED: To obtain a new phosphoric ester useful as a mold-releasing agent capable of providing a resin molded product excellent in transparency and mold-releasability. SOLUTION: The new compound is a phosphoric ester of formula I (R1 is a 1-20C residue after removing phenyl; R2 and R3 are each H, methyl or ethyl with the proviso that the case in which both of R2 and R3 are H is excluded), e.g. di(1-n-butoxy-2-propyl)phosphate. The compound of formula I is obtained, for example, by reacting an epoxy compound such as 1,2-propylene oxide with a hydroxy compounds such as alcohols to synthesize hydroxyalcohols, further reacting the hydroxyalcohols with a phosphorus oxyhalide to provide a halide of the phosphoric ester of formula II (X is a halogen), and hydrolyzing the obtained halide. A transparent resin obtained by adding a mold-releasing agent obtained by adding the compound of formula I to a transparent resin composition and curing the composition allows the obtained molded product therefrom to be easily released from a mold, and is useful as a transparent optical material such as a plastic lens.
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