Provided is a sealing method that uses a photo-curable sealant sheet. The sealing method provided comprises, in the following order, a step of obtaining a photo-curable sealant sheet, a step of subj ecting the sealant sheet to photoirradiation, and a step of applying the sealant sheet to a target object.

A photocurable composition is provided. A cured product formed by curing the photocurable composition has reworkability and excellent heat resistance while having flexibility. The photocurable composition includes a telechelic acrylic polymer having an acryloyl group at both ends; a polyfunctional acrylic polymer having acryloyl groups; a monofunctional acrylic monomer; and a fumed silica including at least one of a hydrophilic fumed silica or a fumed silica having a polar group. The photocurable composition has a Martens hardness of 0.07 to 0.75 N/mm.sup.2, where the Martens hardness is a hardness after the photocurable composition is cured.

A photocurable composition is provided. A cured product formed by curing the photocurable composition has reworkability and excellent heat resistance while having flexibility. The photocurable composition includes a telechelic acrylic polymer having an acryloyl group at both ends; a polyfunctional acrylic polymer having acryloyl groups; a monofunctional acrylic monomer; and a fumed silica including at least one of a hydrophilic fumed silica or a fumed silica having a polar group. The photocurable composition has a Martens hardness of 0.07 to 0.75 N/mm.sup.2, where the Martens hardness is a hardness after the photocurable composition is cured.

A system for customization of a photochromic article (14) includes a container (12) having an interior (28). At least one actinic radiation source (34) is located in the interior (28) of the container (12). At least one deactivation radiation source (36) is located in the interior (28) of the container (12). A method of customizing a photochromic article (14) includes inserting a photochromic article (14) having at least one non-thermally reversible photochromic material into a container (12) having at least one actinic radiation source (34) and actuating the at least one actinic radiation source (34) to activate the at least one non-thermally reversible photochromic material.

An object of the present invention is to provide a photocurable resin composition having a high curing degree after irradiation with light while maintaining cured material characteristics such as high extensibility and high strength. Provided is a photocurable resin composition including the following ingredients (A) to (C): ingredient (A): a polyisobutylene resin containing one or more (meth)acryloyl groups and a —[CH.sub.2C(CH.sub.3).sub.2]— unit; ingredient (B): ingredient (b1): an acrylate monomer having an alicyclic hydrocarbon group having 5 to 25 carbon atoms, and ingredient (b2): an acrylate monomer having a linear or branched alkyl group having 11 to 30 carbon atoms; and ingredient (C): a photo-radical polymerization initiator.

An object of the present invention is to provide a photocurable resin composition that can cope with application by screen printing and can be photocured in a short time. The present invention relates to a photocurable resin composition containing the following components (A) to (D): component (A): a polymer having one or more (meth)acryloyl groups and a polyisobutylene skeleton containing —[CH.sub.2C(CH.sub.3).sub.2]— unit, component (B): a monofunctional monomer containing the following component (b1) and component (b2), component (b1): a monofunctional monomer having a (meth)acryloyl group and a hydroxy group, component (b2): a monofunctional monomer having a (meth)acryloyl group and no hydroxy group, component (C): a radical polymerization initiator, and component (D): organic resin particles.

An object of the present invention is to provide a photocurable resin composition having a high curing degree after irradiation with light while maintaining cured material characteristics such as high extensibility and high strength.

Provided is a photocurable resin composition including the following ingredients (A) to (C): ingredient (A): a polyisobutylene resin containing one or more (meth)acryloyl groups and a —[CH.sub.2C(CH.sub.3).sub.2]— unit; ingredient (B): ingredient (b1): an acrylate monomer having an alicyclic hydrocarbon group having 5 to 25 carbon atoms, and ingredient (b2): an acrylate monomer having a linear or branched alkyl group having 11 to 30 carbon atoms; and ingredient (C): a photo-radical polymerization initiator.

Curable sealant compositions comprise the components: a) x weight percent of at least one polythiol; b) y weight percent of at least one unsaturated compound having at least two non-aromatic carbon-carbon double bonds, at least one carbon-carbon triple bond, or a combination thereof; c) from 0.01 to 8 weight percent of at least one quaternary ammonium or phosphonium salt; d) from 0.05 to 10 weight percent of at least one organic peroxide; and e) optionally from 0.01 to 10 weight percent of a photoinitiator system capable of generating free radicals upon exposure to actinic radiation. Each of x and y represents a positive real number. The sum x+y is in the range of 72 to 99. The weight percent ranges of the components a)-e) are based on the total weight of the components a)-e). A seal cap including the curable sealant composition and methods of making and using the curable sealant compositions are also disclosed.

An object of the present invention is to provide a photocurable resin composition that can cope with application by screen printing and can be photocured in a short time. The present invention relates to a photocurable resin composition containing the following components (A) to (D): component (A): a polymer having one or more (meth)acryloyl groups and a polyisobutylene skeleton containing —[CH.sub.2C(CH.sub.3).sub.2]— unit, component (B): a monofunctional monomer containing the following component (b1) and component (b2), component (b1): a monofunctional monomer having a (meth)acryloyl group and a hydroxy group, component (b2): a monofunctional monomer having a (meth)acryloyl group and no hydroxy group, component (C): a radical polymerization initiator, and component (D): organic resin particles.

The present invention aims to provide a curable resin composition excellent in surface curability and deep curability by irradiation with active energy rays such as ultraviolet rays while maintaining sealability. The present invention provides a curable resin composition including the following ingredients (A) to (D): ingredient (A): a polymer which has one or more (meth)acryloyl groups and has a polyisobutylene backbone containing a —[CH2C(CH3)2]- unit, ingredient (B): a radical polymerization initiator, ingredient (C): a triarylphosphine or a triarylphosphine derivative, and ingredient (D): xanthone or a xanthone derivative.