Provided is a method for producing a resin lens, comprising: A) mixing a polyisocyanate, a modified isocyanate, a catalyst and a release agent, and performing vacuum defoaming at 0˜30° C. for 10˜90 min to obtain a material a; B) mixing the material a with a sulfur-containing compound, and performing vacuum defoaming at 15˜20° C. for 20˜120 min to obtain mixed monomers; and C) completing casting of the mixed monomers, and curing to obtain a resin lens. The present disclosure uses polyisocyanate and a modified isocyanate at the same time to prepare a resin lens with higher glass transition temperature and higher surface hardness without producing bank mark and edge fogging. The present disclosure further provides a method for producing modified isocyanate. The obtained modified isocyanate used with polyisocyanate further improves the glass transition temperature and surface hardness of the resin lens without producing bank mark and edge fogging.

A polymerizable composition for optical material including two or more different monomers for optical material and a polymerization catalyst, in which the content of the polymerization catalyst relative to the total amount of the monomers for optical material is from 0.1150 to 0.2000 parts by mass, the viscosity of the polymerizable composition for optical material is from 10 mPa.Math.s to 1000 mPa.Math.s as measured with a B-type viscometer at 20° C. and 60 rpm, and at least one of the two or more different monomers for optical material is an episulfide compound.

According to the present invention, it is possible to provide an optical material composition that contains an episulfide compound represented by formula (1) and an episulfide compound represented by formula (2). According to this optical material composition, it is possible to suppress a reduction in the yield rate caused by molding defects, and possible to obtain an optical material having excellent dyeability.

##STR00001##

(In formula (1), m and p are each an integer between 0 and 4, and n and q are each an integer between 0 and 2.)

##STR00002##

(In formula (2), m is an integer between 0 and 4 and n is an integer between 0 and 2.)

The present invention relates to [1] a polymerizable composition for optical member containing a polymerizable component and a urethaneurea compound having a structural unit derived from tolylene diisocyanate in an amount of 0.1 to 10 parts by mass based on 100 parts by mass of a total amount of the polymerizable component; [2] a production method of an optical member, including a step of injecting the polymerizable composition of [1] into a molding die, and a step of polymerizing the polymerizable composition; and [3] a spectacle lens including a spectacle lens substrate obtained by the production method of [2].

The purpose of the present invention is to appropriately control the rate of polymerization of a composition in which a thiol compound and an isocyanate compound are added to an episulfide compound and thereby provide an optical material which has high transparency. This composition for use as optical material comprises (a) an episulfide compound, (b) an isocyanate compound, (c) a thiol compound, and (d) a benzyl halide compound represented by formula (1): ##STR00001##
wherein: X is a halogen; L is selected from the group consisting of a hydrogen atom, a methyl group, a halogen, a mercaptomethyl group, and an isocyanate methyl group; and n is 1 or 2.

A film for glass bonding includes a thiourethane layer comprising a heterocyclo-alkanediyl-based repeat unit indicated by Formula 1, ##STR00001##
and a linear alkanediyl-based repeat unit indicated by Formula 2, ##STR00002##
and a base layer, disposed on a surface of the thiourethane layer, comprising a polyvinyl acetal resin and a plasticizer. In the Formula 1, R1 is —O— or —S—, and X is a heterocyclo-alkanediyl group having carbon atoms of 3 to 10 and sulfur atoms of 1 to 5, and in the Formula 2, R2 is —O— or —S—, and n2 is an integer of 4 to 10.

A film for glass bonding includes a thiourethane layer comprising a heterocyclo-alkanediyl-based repeat unit indicated by Formula 1,

##STR00001##

and a linear alkanediyl-based repeat unit indicated by Formula 2,

##STR00002##

and a base layer, disposed on a surface of the thiourethane layer, comprising a polyvinyl acetal resin and a plasticizer. In the Formula 1, R1 is —O— or —S—, and X is a heterocyclo-alkanediyl group having carbon atoms of 3 to 10 and sulfur atoms of 1 to 5, and in the Formula 2, R2 is —O— or —S—, and n2 is an integer of 4 to 10.

The present invention relates to [1] a polymerizable composition for optical member containing a polymerizable component and a urethaneurea compound having a structural unit derived from tolylene diisocyanate in an amount of 0.1 to 10 parts by mass based on 100 parts by mass of a total amount of the polymerizable component; [2] a production method of an optical member, including a step of injecting the polymerizable composition of [1] into a molding die, and a step of polymerizing the polymerizable composition; and [3] a spectacle lens including a spectacle lens substrate obtained by the production method of [2].

Provided is a method for producing a resin lens, comprising: A) mixing a polyisocyanate, a modified isocyanate, a catalyst and a release agent, and performing vacuum defoaming at 0˜30° C. for 10˜90 min to obtain a material a; B) mixing the material a with a sulfur-containing compound, and performing vacuum defoaming at 15˜20° C. for 20˜120 min to obtain mixed monomers; and C) completing casting of the mixed monomers, and curing to obtain a resin lens. The present disclosure uses polyisocyanate and a modified isocyanate at the same time to prepare a resin lens with higher glass transition temperature and higher surface hardness without producing bank mark and edge fogging. The present disclosure further provides a method for producing modified isocyanate. The obtained modified isocyanate used with polyisocyanate further improves the glass transition temperature and surface hardness of the resin lens without producing bank mark and edge fogging.

A diffraction light guide plate having excellent thickness uniformity and flatness, and having low haze, and excellent mechanical properties such as pencil hardness and strength at the same time, and a method for manufacturing the diffraction light guide plate.