Abstract: A polymerizable composition for an optical material according to the present invention includes a photochromic composition (A), and a polymerizable composition (B) including a bi- or higher functional iso(thio)cyanate compound and a bi- or higher functional active hydrogen compound, in which the photochromic composition (A) is a composition including at least three types of photochromic compounds (i) to (iii), the photochromic compound (i) has a structure including a chromophore a and a monovalent or a divalent organic group including one or more types of a polysiloxane chain or a polyoxyalkylene chain, the photochromic compound (ii) has the chromophore a (which is not the photochromic compound (i)), and the photochromic compound (iii) has a chromophore b different from the chromophore a.

Abstract: A polymerizable composition for an optical material of the present invention includes (A) an allyl carbonate compound represented by General Formula (1) and including two or more allyloxycarbonyl groups; (B) a (meth)acrylate compound represented by General Formula (2) and including two or more (meth)acryl groups; and (C) a photochromic compound, in which, in 100% by weight in a total of the compound (A) and the compound (B), the compound (A) is included in an amount of more than 0% by weight and 30% by weight or less and the compound (B) is included in an amount of 70% by weight or more and less than 100% by weight.

Abstract: The polymerizable composition for an optical material includes an allyl carbonate compound (A) including two or more allyloxycarbonyl groups which is represented by General Formula (1); a (meth)acrylate compound (B) including two or more (meth)acryl groups which is represented by General Formula (2); at least one kind of compound (C), selected from compounds represented by General Formulas (3) to (6) and specified dyes; and a polymerization initiator (D) including at least a radical polymerization initiator (D1) and a radical polymerization initiator (D2).

Abstract: A polymerizable composition for an optical material of the present invention includes (A) an allyl carbonate compound represented by General Formula (1) and including two or more allyloxycarbonyl groups; (B) a (meth) acrylate compound represented by General Formula (2) and including two or more (meth) acryl groups; and (C) a photochromic compound, in which, in 100% by weight in a total of the compound (A) and the compound (B), the compound (A) is included in an amount of more than 0% by weight and 30% by weight or less and the compound (B) is included in an amount of 70% by weight or more and less than 100% by weight.

Abstract: Provided is a photochromic lens in which a transmittance at 23° C. after irradiation using a xenon lamp at an illuminance of 50,000 lux for 15 minutes satisfies the following conditions. (1) A transmittance at 550 nm is 25% or less. (2) A transmittance a at 550 nm is larger than a minimum transmittance b between 575 nm and 600 nm, and a difference between the transmittance a and the transmittance b is 5% or more. (3) There are one or more points of inflection in a transmittance curve from 550 nm to 600 nm.

Abstract: A polymerizable composition for an optical material according to the present invention includes a polyisocyanate compound (A), a polyol compound (B) having a number average molecular weight of 100 or more, a difunctional or higher functional active hydrogen compound (C) (but, excluding the compound (B)), a photochromic compound (D), and an ultraviolet absorber (E).

Abstract: A molded product according to the present invention is a molded product obtainable by polymerizing and curing a polymerizable composition including: a polyisocyanate compound (A); a polyol compound (B) which is represented by Formula (1) and which has a number average molecular weight of equal to or greater than 100; a bifunctional or higher functional active hydrogen compound (C) (here, excluding the compound (B)); and a photochromic compound (D), in which a concentration of SH groups measured by an IR analysis method is less than 1.0 wt %.

Abstract: A polymerizable composition for optical materials of the present invention includes a polyisocyanate compound (A), a polyol compound (B) represented by the following General Formula (1) having a number average molecular weight of 100 or more, a di- or higher functional active hydrogen compound (C) (here, the compound (B) is excluded), and a photochromic compound (D).

Abstract: [Problem] To provide a photochromic lens for eye glasses, which has a high refractive index and excellent light-controlling properties and has such a constitution that the weight and thickness of the lens can be reduced. [Solution] Provided is a photochromic lens for eye glasses, which is produced by polymerizing a polymerizable composition prepared by dissolving a photochromic compound into a monomer mixture comprising a first radically polymerizable monomer represented by general formula (I), a second radically polymerizable monomer represented by general formula (II) and divinylbenzene that has a purity of 50% or more and contains a divinylbenzene component and an ethylvinylbenzene component at a total content of 90% or more.

Abstract: A method for producing a progressive-addition plastic lens having a prism thinning applied thereto without cutting and polishing includes: a lens molding die forming step of forming a lens molding die configured by a first molding die having a molding face for forming one optical surface, which is a progressive-addition surface, of the lens and a second molding die having a molding face for forming the other optical surface of the lens, wherein the first molding die and the second molding die are arranged so that the respective molding faces thereof face inner side; a filling step of filling a lens material liquid containing a monomer composition into the formed lens molding die; and a curing step of polymerizing and curing the filled lens material liquid so as to form the lens.

Abstract: [Problem] To provide a photochromic lens for eye glasses, which has a high refractive index and excellent light-controlling properties and has such a constitution that the weight and thickness of the lens can be reduced. [Solution] Provided is a photochromic lens for eye glasses, which is produced by polymerizing a polymerizable composition prepared by dissolving a photochromic compound into a monomer mixture comprising a first radically polymerizable monomer represented by general formula (I), a second radically polymerizable monomer represented by general formula (II) and divinylbenzene that has a purity of 50% or more and contains a divinylbenzene component and an ethylvinylbenzene component at a total content of 90% or more.

Abstract: The present invention provides a method for producing a progressive-addition plastic lens having a prism thinning applied thereto without cutting and polishing. The method comprises: a lens molding die forming step of forming a lens molding die configured by a first molding die having a molding face for forming one optical surface, which is a progressive-addition surface, of the lens and a second molding die having a molding face for forming the other optical surface of the lens, wherein the first molding die and the second molding die are arranged so that the respective molding faces thereof face inner side; a filling step of filling a lens material liquid containing a monomer composition into the formed lens molding die; and a curing step of polymerizing and curing the filled lens material liquid so as to form the lens.

Abstract: A mold (1) for molding a plastic lens is formed of a first mold (3) which forms one lens surface of the plastic lens, a second mold (4) which forms the other lens surface of the plastic lens, and a cylindrical gasket (2) into which the first and second molds (3, 4) are to be pressed. An elastically deformable projecting band (5) which has a triangular section and tapers gradually toward its distal end integrally projects on the inner circumferential surface of the gasket (2). The projecting band (5) projects on the inner circumferential surface of the gasket (2) throughout an entire circumference to form a ring-like shape, and inclines upward with respect to an axis (L) of the gasket (2). The first mold (3), when pressed into the gasket (2), presses the projecting band (5) to elastically deform it downward.

Abstract: A process for producing a plastic lens comprises, using a mold constituted with a pair of mold members facing each other and a plastic gasket which fixes the mold members to form a cavity and has an inlet for injecting a composition of a material monomer into the cavity, injecting the composition of a material monomer into the cavity through the inlet of the plastic gasket, sealing the inlet of the plastic gasket and, thereafter, conducting polymerization, wherein the inlet of the plastic gasket is sealed by the ultrasonic welding. No striae is formed in the produced lens, and the operations of the production can be performed efficiently at a high speed.

Abstract: A process for producing a plastic lens comprises, using a mold constituted with a pair of mold members facing each other and a plastic gasket which fixes the mold members to form a cavity and has an inlet for injecting a composition of a material monomer into the cavity, injecting the composition of a material monomer into the cavity through the inlet of the plastic gasket, sealing the inlet of the plastic gasket and, thereafter, conducting polymerization, wherein the inlet of the plastic gasket is sealed by the ultrasonic welding. No striae is formed in the produced lens, and the operations of the production can be performed efficiently at a high speed.

Abstract: A mold (1) for molding a plastic lens is formed of a first mold (3) which forms one lens surface of the plastic lens, a second mold (4) which forms the other lens surface of the plastic lens, and a cylindrical gasket (2) into which the first and second molds (3, 4) are to be pressed. An elastically deformable projecting band (5) which has a triangular section and tapers gradually toward its distal end integrally projects on the inner circumferential surface of the gasket (2). The projecting band (5) projects on the inner circumferential surface of the gasket (2) throughout an entire circumference to form a ring-like shape, and inclines upward with respect to an axis (L) of the gasket (2). The first mold (3), when pressed into the gasket (2), presses the projecting band (5) to elastically deform it downward.

Abstract: A method of manufacturing plastic photochromic lenses includes obtaining a lens by polymerizing and curing a monomer mixture. The monomer mixture includes one of monofunctional and bifunctional methacrylic ester monomers, a trifunctional methacrylic ester monomer and a photochromic dye. Then, radiation including ultraviolet radiation is directed onto a surface of the lens obtained so that the radiation activates the surface of the lens to break down macromolecular chains of the surface of the lens. A composition including an organic silicon compound and a colloidal metal oxide is coated onto the surface of the lens exposed to the radiation. The composition coated is cured to obtain a hard surface film.

Abstract: A method of manufacturing plastic photochromic lenses characterized by comprising the steps of: