High-speed polymerizable resin composition and lenses obtained therefrom.

摘要

Described are a high-speed polymerizable resin composition and a lens obtained from it. The composition comprises: a) at least 70 but smaller than 90 parts by weight of a mixture composed of: i) an aromatic polyisocyanate compound represented by the following formula (I) : <CHEM> wherein R represents a hydrogen atom or a methyl group, and ii) a polythiol having at least 3 mercapto groups per molecule and a sulfur content of at least 40 wt.%; and b) at least 10 but smaller than 30 parts by weight of a compound which has, in a molecule, at least one functional group selected from a hydroxyl group or a mercapto group and also at least one functional group selected from an acrylic group, methacrylic group or styrylic group, said composition containing isocyanato groups, mercapto groups and hydroxy groups at an NCO/(SH + OH) equivalent ratio of from 0.50 to 1.50 and being capable of providing a lens resin having a refractive index (nd) of at least 1.59. The resin composition can be polymerized in a very short time and moreover, can provide a plastic lens which is free of optical unevenness (striae) and has a high refractive index.