Abstract: There are provided indeno-fused naphthopyran compound particles having a degree of crystallization of 10.00% or less and a maximum primary particle size of 200 ?m or less.

Abstract: A method of producing a polymerizable composition including mixing a photochromic compound with one or more polymerizable compounds using an ultrasonic homogenizer.

Abstract: A photochromic composition contains, in a predetermined combination: one or more photochromic compounds represented by General Formula 1; and one or more selected from the group consisting of a photochromic compound represented by General Formula A, a photochromic compound represented by General Formula B, and a photochromic compound represented by General Formula C.

Abstract: A valve device includes a flow path formation member provided with at least one flow path hole through which a fluid passes, and a drive part that outputs a rotational force. The valve device includes a shaft, and a rotor having a sliding surface that slides while facing an opening surface of the flow path formation member where the flow path hole is opened, and the rotor is configured to increase or decrease an opening degree of the flow path hole with rotation of the shaft. The valve device includes an energization member that energizes the rotor toward the flow path formation member. The valve device includes a coupling structure configured to tiltably couple the shaft to the rotor such that a contact state between the sliding surface and the opening surface is held regardless of a posture or a position of the shaft.

Abstract: A measurement apparatus used for a sorting apparatus for sorting objects includes a scanning unit configured to perform scanning with illumination light which illuminates the object, a control unit configured to control the scanning unit, and a sensor configured to measure reflection light from the illuminated object, wherein the control unit controls the scanning unit to track the object with the illumination light by changing a position of the illumination light in a moving direction of the object and a direction perpendicular to the moving direction.

Abstract: The photochromic compound is represented by General Formula 1 . R30 and R31 each independently represent a linear or branched alkyl group having 2 or more carbon atoms, which is unsubstituted or has one or more substituents; a cyclic alkyl group having 3 or more carbon atoms which is unsubstituted or has one or more substituents; or represents a group represented by - (R100) nR101 which is unsubstituted or has one or more substituents, R100 represents an alkyleneoxy group, R101 represents an alkyl group, n represents an integer of 1 or more, a total number of carbon atoms of n alkyleneoxy groups represented by R100 and alkyl groups represented by R101 is 2 or more, R32 to R35 each independently represent a hydrogen atom or a substituent other than an electron-attracting group, and R36, R37, B7 and B8 each independently represent a hydrogen atom or a substituent.

Abstract: An optical article, such as a spectacle lens, includes, on a substrate, a photochromic layer containing a photochromic dye and a resin component, and a protective film. The indentation hardness of the photochromic layer in the thickness direction is less than or equal to the indentation hardness of the surface of the substrate. The result of multiplying the indentation hardness of the protective film in the thickness direction and the thickness of the protective film is five-hundredths or more times and one or less times the result of multiplying the indentation hardness of the photochromic layer in the thickness direction and the thickness of the photochromic layer.

Abstract: The photochromic composition contains one or more compounds represented by General Formula A, one or more compounds represented by General Formula B, and one or more compounds represented by General Formula C is provided. In General Formula A, R1 to R6, B1, and B2 each independently represent a hydrogen atom or a substituent. In General Formula B, R7 to R12, B3, and B4 each independently represent a hydrogen atom or a substituent, and R13 and R14 each independently represent an electron-donating group. In General Formula C, R15 to R20, B5, and B6 each independently represent a hydrogen atom or a substituent, and one of R21 and R22 represents a hydrogen atom and the other represents an electron-donating group.

Abstract: Provided is a polymerizable composition for an optical article including a photochromic compound, an acyclic methacrylate having a molecular weight of 500 or more (a component A), and a bifunctional (meth)acrylate containing a structure selected from the group consisting of a cyclic structure and a branch structure (component B).

Abstract: An optical article, such as a spectacle lens, includes, on a substrate, a photochromic layer containing a photochromic dye and a resin component, and a protective layer. The indentation hardness of the photochromic layer in the thickness direction is in a range from 0.1 to 10 mgf/?m2. The value defined by the indentation hardness of the protective layer in the thickness direction multiplied by the thickness of the protective layer is five or more times and nine thousand or less times the value defined by the indentation hardness of the photochromic layer in the thickness direction multiplied by the thickness of the photochromic layer.

Abstract: Provided is a polymerizable composition for an optical article including a photochromic compound, a component A: an acyclic methacrylate having a molecular weight of 500 or more, and a component B: a (meth)acrylate having a molecular weight of 400 or less and represented by Formula 1. In Formula 1, R1 and R2 each independently represent a hydrogen atom or a methyl group, m represents an integer of 1 or more.

Abstract: Provided is an optical article having a substrate, a primer layer generated by curing a polymerizable composition for forming the primer layer, and a photochromic layer generated by curing a (meth)acrylate-based polymerizable composition containing a photochromic compound in this order, in which the polymerizable composition for forming the primer layer contains a component A: polyisocyanate and a component B: hydroxy group-containing (meth)acrylate.

Abstract: Provided is a polymerizable composition for an optical article including a photochromic compound, a component A: an acyclic methacrylate having a molecular weight of 500 or more, and a component B: a hydroxy group-containing (meth)acrylate.

Abstract: Provided a polymerizable composition for forming a protective layer of a photochromic article including one or more types of (meth)acrylates and 70.0 mass % or more of an alicyclic bifunctional (meth)acrylate based on a total amount of the (meth)acrylates.

Abstract: Provided is an optical article having a substrate, a primer layer generated by curing a polymerizable composition for forming the primer layer, and a photochromic layer containing a photochromic compound in this order, in which the polymerizable composition for forming the primer layer contains a component A: a polyisocyanate, a component B: a hydroxy group-containing polymerizable compound, and a component C: a polymerizable compound having a viscosity of 100 cP or less and being selected from the group consisting of (meth)acrylates and vinyl ethers.

Abstract: A coating composition for an optical article containing a photochromic compound and two or more (meth)acrylates, the two or more (meth)acrylates containing a non-cyclic difunctional methacrylate having a molecular weight of 500 or more and a non-cyclic tri- or higher functional (meth)acrylate.

Abstract: A coating composition for an optical article containing a photochromic compound and two or more (meth)acrylates, the two or more (meth)acrylates containing an alicyclic difunctional (meth)acrylate and a non-cyclic tri- or higher functional (meth)acrylate.

Abstract: A spectacle lens including a lens substrate and a photochromic layer, wherein the photochromic layer is a cured layer of a curable composition containing a photochromic compound and a plurality of curable compounds, a surface Martens hardness of the photochromic layer is 5.0 kgf/mm2 or more, and the plurality of curable compounds contain components (1) to (3) below: (1) neopentyl glycol di(meth)acrylate; (2) a curable compound having an L-scale Rockwell hardness of homopolymer of 60 or more; and (3) a curable compound having an L-scale Rockwell hardness of homopolymer of 40 or less.

Abstract: An optical article, such as a spectacle lens, includes, on a substrate, a photochromic layer containing a photochromic dye and a resin component, and a protective film. The indentation hardness of the photochromic layer in the thickness direction is less than or equal to the indentation hardness of the surface of the substrate. The result of multiplying the indentation hardness of the protective film in the thickness direction and the thickness of the protective film is five-hundredths or more times and one or less times the result of multiplying the indentation hardness of the photochromic layer in the thickness direction and the thickness of the photochromic layer.

Abstract: An optical article, such as a spectacle lens, includes, on a substrate, a photochromic layer containing a photochromic dye and a resin component, and a protective layer. The indentation hardness of the photochromic layer in the thickness direction is in a range from 0.1 to 10 mgf/?m2. The value defined by the indentation hardness of the protective layer in the thickness direction multiplied by the thickness of the protective layer is five or more times and nine thousand or less times the value defined by the indentation hardness of the photochromic layer in the thickness direction multiplied by the thickness of the photochromic layer.