A composition for an optical material contains (a) an episulfide compound, (b) a polymerization catalyst, and (c) an ester compound having a halogen at the α position. The (c) ester compound having a halogen at the a position is preferably at least one compound selected from the group consisting of dimethyl chloromalonate, diethyl chloromalonate, dimethyl bromomalonate, and diethyl bromomalonate.

A composition for an optical material contains (a) an episulfide compound, (b) a polymerization catalyst, and (c) an ester compound having a halogen at the α position. The (c) ester compound having a halogen at the a position is preferably at least one compound selected from the group consisting of dimethyl chloromalonate, diethyl chloromalonate, dimethyl bromomalonate, and diethyl bromomalonate.

A cure promoter composition is disclosed, including an accelerator which may include a thiocarbamate, a hydrated thiocarbamate, a dithiocarbamate, a thiazole, a mercaptothiazole, a sulfenamide, a thiazolesulfenamide, a metal salt of thiocarbamate, sulfur chloride, or combinations thereof. The cure promoter composition also includes a compatibilizing carrier, one or more organic solvents, a catalyst, an optional reducing agent, an optional reactive silane, an optional reactive organometallic, an optional gelling agent, and an optional aqueous component. A method for applying the cure promoter composition is disclosed, including contacting the organic solvents, the accelerator, the carrier, the reactive silanes, the reactive organometallics, the reducing agents, and the catalyst with one another to prepare the cure promoter composition, homogenizing the cure promoter composition, pausing after homogenizing to allow the cure promoter time to react, applying a sealant onto a substrate, and applying the cure promoter composition to a surface of the sealant.

It is an object of the present disclosure to provide a method for efficiently and economically producing a polythioether compound by performing a ring-opening polymerization of an alicyclic episulfide compound.

The present disclosure provides a method for producing a polythioether compound, the method including performing a ring-opening polymerization of an alicyclic episulfide compound in the presence of a base. The base is preferably an amine compound. Further, the base is preferably a strong base.

It is an object of the present disclosure to provide a method for efficiently and economically producing a polythioether compound by performing a ring-opening polymerization of an alicyclic episulfide compound.

The present disclosure provides a method for producing a polythioether compound, the method including performing a ring-opening polymerization of an alicyclic episulfide compound in the presence of a base. The base is preferably an amine compound. Further, the base is preferably a strong base.

A polymerizable composition for an optical material includes a compound represented by General Formula (1) and a polymerization reactive compound. ##STR00001##

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.

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.

One embodiment according to the present disclosure relates to a spectacle lens containing a compound having a maximum absorption wavelength of 350 nm or more and 365 nm or less and a molar extinction coefficient of 20,000 l/mol.Math.cm or more.

One embodiment according to the present disclosure relates to a spectacle lens containing a compound having a maximum absorption wavelength of 350 nm or more and 365 nm or less and a molar extinction coefficient of 20,000 l/mol.Math.cm or more.