Provided are novel polyisocyanate compounds of the general formula (I) (wherein Z represents a direct bond or -CH2-)
which are useful as starting compounds for optical resin materials having excellent optical characteristics such as a high refractive index and a low dispersion, and a process for producing this compound at good efficiency.
Further provided is a process for producing the desired polyisocyanate compounds through a tricarboxylic acid ester and a tricarbonyl hydrazide using a dihalogeno-aliphatic carboxylic acid lower alkyl ester and a thioglycolic acid lower alkyl ester as starting materials.
According to a second process the compounds (I) wherein Z is -CH2- are prepared through a tricarboxylic acid ester and a tricarbonyl hydrazide using a propiolic acid lower alkyl ester and a thioglycolic acid lower alkyl ester as starting materials.
本发明提供了通式(I)的新型多
异氰酸酯化合物(其中 Z 代表直接键或 -
CH2-)。
的新型多
异氰酸酯化合物(其中 Z 代表直接键或 - -),该化合物可用作光学
树脂材料的起始化合物,具有优异的光学特性,如高折射率和低分散性。
此外,还提供了一种以二卤代脂肪族
羧酸低级烷基酯和
硫代
乙醇酸低级烷基酯为起始原料,通过
三羧酸酯和三羰基酰
肼生产所需的多
异氰酸酯化合物的工艺。
根据第二种工艺,以
丙二醇低级烷基酯和
巯基乙酸低级烷基酯为起始原料,通过
三羧酸酯和三羰基酰
肼制备其中 Z 为 - - 的化合物 (I)。