Thermosensitive fine particles of the present invention include a side chain crystal polymer which is crystallized at a temperature lower than a melting point and which exhibits fluidity at a temperature equal to or more than the melting point. The side chain crystal polymer may include, as a monomer component, a (meth)acrylate having a straight-chain alkyl group having 14 or more carbon atoms. A mean particle diameter of the fine particles may be 0.1 to 50 μm. The thermosensitive fine particles may include no organic solvents.

A curable composition includes, per 100 parts by mass of a curable compound, 0.1 to 10.0 parts by mass of a compound (A) including a structure represented by the following general formula (I), and 0.01 to 10.0 parts by mass of a base (B):

##STR00001##

where X represents a chalcogen atom, R.sup.1 and R.sup.2 each independently represent an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aryl group, or an aralkyl group, and R.sup.3 and R.sup.4 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aryl group, or an aralkyl group.

A curable composition includes, per 100 parts by mass of a curable compound, 0.1 to 10.0 parts by mass of a compound (A) including a structure represented by the following general formula (I), and 0.01 to 10.0 parts by mass of a base (B):

##STR00001##

where X represents a chalcogen atom, R.sup.1 and R.sup.2 each independently represent an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aryl group, or an aralkyl group, and R.sup.3 and R.sup.4 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkenyl group having 2 to 6 carbon atoms, an aryl group, or an aralkyl group.

Articles that include at least one application layer; at least one bead bond layer (10); a layer of optical elements (20) that are partially embedded in the at least one bead bond layer (10); and at least one reflective layer (30) that is located functionally between the layer of optical elements (20) and the bead bond layer (10), wherein the at least one bead bond layer (10), the at least one application layer, or both comprise a cured product of an adhesive compositions that include polymerized units of one or more (meth)acrylate ester monomers derived from an alcohol containing 1 to 14 carbon atoms; at least one of urethane acrylate polymer or at least one acrylic copolymer; and at least one initiator.

Articles that include at least one application layer; at least one bead bond layer (10); a layer of optical elements (20) that are partially embedded in the at least one bead bond layer (10); and at least one reflective layer (30) that is located functionally between the layer of optical elements (20) and the bead bond layer (10), wherein the at least one bead bond layer (10), the at least one application layer, or both comprise a cured product of an adhesive compositions that include polymerized units of one or more (meth)acrylate ester monomers derived from an alcohol containing 1 to 14 carbon atoms; at least one of urethane acrylate polymer or at least one acrylic copolymer; and at least one initiator.

The present invention provides: a photochromic curable composition which contains (A) a (meth)acrylate composition that contains from 24 to 100% by mass of a polyfunctional (meth)acrylate which has three or more (meth)acryloyl groups in each molecule and (B) a photochromic compound that is obtained by bonding at least one specific naphthopyran to a long-chain group having a number average molecular weight of from 300 to 10,000; and a photochromic optical article which is obtained by polymerizing this photochromic curable composition.

The present invention provides: a photochromic curable composition which contains (A) a (meth)acrylate composition that contains from 24 to 100% by mass of a polyfunctional (meth)acrylate which has three or more (meth)acryloyl groups in each molecule and (B) a photochromic compound that is obtained by bonding at least one specific naphthopyran to a long-chain group having a number average molecular weight of from 300 to 10,000; and a photochromic optical article which is obtained by polymerizing this photochromic curable composition.

A polymerizable composition containing: (A) a compound having an alkylene oxide group and a (meth)acrylic group, with an alkylene oxide equivalent of less than 100 and a (meth)acrylic equivalent of less than 200, and having 2 or more identical polymerizable groups; (B) a compound having a molecular weight of 140 to 350, having no alkylene oxide group but having a (meth)acrylic group, with a (meth)acrylic equivalent of 137 or less, and having 2 or more carbon-carbon double bonds; (C) a compound having a fluoro(poly)ether group and having 1 or more carbon-carbon double bonds; and (D) a polymerization initiator, wherein a content of (A) is 1.8% to 98% by mass, a content of (B) is 1.8% to 98% by mass, a content of (C) is 0.1% to 10% by mass, and a content of (D) is 0.1% to 10% by mass, based on a total mass of the polymerizable composition.

A polymerizable composition containing: (A) a compound having an alkylene oxide group and a (meth)acrylic group, with an alkylene oxide equivalent of less than 100 and a (meth)acrylic equivalent of less than 200, and having 2 or more identical polymerizable groups; (B) a compound having a molecular weight of 140 to 350, having no alkylene oxide group but having a (meth)acrylic group, with a (meth)acrylic equivalent of 137 or less, and having 2 or more carbon-carbon double bonds; (C) a compound having a fluoro(poly)ether group and having 1 or more carbon-carbon double bonds; and (D) a polymerization initiator, wherein a content of (A) is 1.8% to 98% by mass, a content of (B) is 1.8% to 98% by mass, a content of (C) is 0.1% to 10% by mass, and a content of (D) is 0.1% to 10% by mass, based on a total mass of the polymerizable composition.

Provided is a curable resin composition having developability and resolution improved without degrading the heat resistance and the chemical resistance, furthermore, a curable resin composition that is useful as a PID material for optical uses or a material for optical sensor protective films and enables the formation of a cured product having both higher transparency and excellent heat resistance, a dry film containing the curable resin composition, a cured product thereof and a printed wiring board including the cured product. A curable resin composition containing (A) an amide-imide resin, (B) a compound having an ethylenic double bond and (C) a photopolymerization initiator, wherein the amide-imide resin (A) is a reaction product of an isocyanurate-type polyisocyanate synthesized from an isocyanate having an aliphatic structure and a tricarboxylic acid anhydride and has a number-average molecular weight of 500 to 1000.