Described is a polymerizable composition comprising (meth)acrylate ester monomer, a macromer and a polymerizable Norrish type I, photoinitiator. The resulting copolymers are physically crosslinked and generally those copolymers having greater than 20 percent macromer produce optically clear films and those having less than 20% macromer can provide high performance pressure sensitive adhesives.

A (meth)acrylic copolymer (A) having a mass average molecular weight of 50,000 to 1,000,000, in which the (meth)acrylic copolymer (A) is obtained by polymerizing a monomer mixture including a macromonomer (a) that has a number average molecular weight of 500 or more and less than 6000 and a vinyl monomer (b), and preferably includes 7 to 40% by mass of a repeat unit derived from the macromonomer (a), has sufficient coating workability, adhesive holding power and adhesive property as an adhesive composition.

A photocurable adhesive sheet that can be photocured even if there are places such as print-concealed sections that are difficult for light to reach, and even if the adhesive sheet has a certain degree of thickness, the entire sheet can be cured. A transparent adhesive sheet formed from an adhesive composition containing: (A) a thermoplastic resin; (B) a crosslinking agent; (C) a photopolymerization initiator that reacts with light having a wavelength of at least 380 to 430 nm; and (D) a wavelength conversion agent that is excited by light having a wavelength shorter than 380 nm and that emits light having a wavelength of 380 to 550 nm. The transparent adhesive sheet is characterized by the adhesive sheet absorbance X at a wavelength of 390 nm and the adhesive sheet thickness Y satisfying relational formula (1):
0.5X/Y12.Formula (1):

A permanent adhesive composition for image sensors which provides an adhesive layer having excellent heat resistance and thermal shock resistance, and a bonding method and laminate using the permanent adhesive composition. The permanent adhesive composition for image sensors contains a thermosetting or photocurable resin containing a specific bifunctional (meth)acrylic acid ester-derived structural unit, a polymerizable monomer, and an antioxidant, and used to bond together a substrate and a support for the substrate. The bonding method includes bonding together a substrate and a support for the substrate using the permanent adhesive composition. The laminate is provided with a substrate, a support for the substrate, and an adhesive layer for bonding the substrate and the support together, and the adhesive layer is formed of the permanent adhesive composition.

A permanent adhesive composition for image sensors which provides an adhesive layer having excellent heat resistance and thermal shock resistance, and a bonding method and laminate using the permanent adhesive composition. The permanent adhesive composition for image sensors contains a thermosetting or photocurable resin containing a specific bifunctional (meth)acrylic acid ester-derived structural unit, a polymerizable monomer, and an antioxidant, and used to bond together a substrate and a support for the substrate. The bonding method includes bonding together a substrate and a support for the substrate using the permanent adhesive composition. The laminate is provided with a substrate, a support for the substrate, and an adhesive layer for bonding the substrate and the support together, and the adhesive layer is formed of the permanent adhesive composition.

A permanent adhesive composition for image sensors which provides an adhesive layer having excellent heat resistance and thermal shock resistance, and a bonding method and laminate using the permanent adhesive composition. The permanent adhesive composition for image sensors contains a thermosetting or photocurable resin containing a specific bifunctional (meth)acrylic acid ester-derived structural unit, a polymerizable monomer, and an antioxidant, and used to bond together a substrate and a support for the substrate. The bonding method includes bonding together a substrate and a support for the substrate using the permanent adhesive composition. The laminate is provided with a substrate, a support for the substrate, and an adhesive layer for bonding the substrate and the support together, and the adhesive layer is formed of the permanent adhesive composition.

Described are aqueous polymer dispersions for composite film lamination, comprising a dispersed polymer and a dissolved polymer, and also a multistage process for preparing them from ethylenically unsaturated, radically polymerizable monomers. In a first stage, a first polymer is prepared by radical emulsion polymerization. In a second stage, an aqueous polymer dispersion is prepared in the presence of the first polymer. The monomers of the first stage comprise monomers with acid groups. The dissolved polymer comprises monomers having oxazoline groups, and also water-soluble monomers. The aqueous polymer dispersions can be used as adhesive for producing composite films.

There is provided an aqueous emulsion derived from a blend comprising an acrylic polymer, wherein the pH of the dispersion medium is less than 7.0, and a water-in-oil emulsion containing a nonionic water-soluble polymer, which aqueous emulsion has viscosity of 1,000 to 15,000 mPa s at 25 C. There are also provided adhesive compositions made using the aqueous emulsion and methods for manufacturing the aqueous emulsion.

A (meth)acrylic copolymer (A) having a mass average molecular weight of 50,000 to 1,000,000, in which the (meth)acrylic copolymer (A) is obtained by polymerizing a monomer mixture including a macromonomer (a) that has a number average molecular weight of 500 or more and less than 6000 and a vinyl monomer (b), and preferably includes 7 to 40% by mass of a repeat unit derived from the macromonomer (a), has sufficient coating workability, adhesive holding power and adhesive property as an adhesive composition.

The present invention provides fast fixturing two part adhesive compositions which include a first part containing a (meth)acrylic component and a cure system for an epoxy resin component of the second part and a second part containing an epoxy resin component and a cure accelerator for the (meth)acrylic component of the first part.