Abstract: Disclosed is an ultraviolet-curable resin composition for multilayer optical discs, which contains (A) dioxane glycol di(meth)acrylate and/or tricyclodecane dimethylol di(meth)acrylate, and (B) a photopolymerization initiator.

Abstract: The present invention relates to an ultraviolet-curable resin composition for an optical disk containing a sulfur-containing compound (A) represented by the following formula (1): (wherein, R1 and R2 each dependently represent a hydrogen atom, a hydroxy group, an alkyloxy group, an alkyl group, an aryl group, a carboxy group, an alkylthio ether group or a halogen atom) a photopolymerizable compound (B) and a photopolymerization initiator (C), and an optical disk having a thin film of the cured product of said resin composition, particularly an optical disk having a reflective film comprising silver or a silver alloy; and said optical disk is prevented from changing the properties of its reflective film comprising silver or a silver alloy, and thus has a higher durability.

Abstract: Disclosed is an ultraviolet-curable resin composition containing a polyurethane compound (A), a photopolymerization initiator (B), and an ethylenically unsaturated compound (C) other than the compound (A). The polyurethane compound (A) is obtained by reacting an epoxycarboxylate compound (c), which is obtained by reacting an epoxy compound (a) having two or more epoxy groups in a molecule with a monocarboxylic acid compound (b) having an ethylenically unsaturated group in a molecule, with a diisocyanate compound (d).

Abstract: Disclosed is an ultraviolet-curable resin composition for multilayer optical discs, which contains (A) dioxane glycol di(meth)acrylate and/or tricyclodecane dimethylol di(meth)acrylate, and (B) a photopolymerization initiator.

Abstract: The present invention relates to an optical disc having a cured product layer of an ultraviolet-curable resin composition containing (A) dicyclopentenyloxyethyl acrylate, (B) urethane (meth)acrylate and/or (C) epoxy (meth)acrylate, and (D) photopolymerization initiator, and a resin composition for the cured product layer thereof and a cured product therewith; and the optical disc of the present invention has less warping after curing and is excellent in transparency and durability and therefore suitable for next generation high density optical discs where recording and/or reproducing are performed using a blue laser; the resin composition for said cured product layer has less deterioration with age and less viscosity change in recycle and is suitable for a coating agent of optical discs and for efficient production of optical discs.

Abstract: Disclosed is an ultraviolet-curable resin composition containing a polyurethane compound (A), a photopolymerization initiator (B), and an ethylenically unsaturated compound (C) other than the compound (A). The polyurethane compound (A) is obtained by reacting an epoxycarboxylate compound (c), which is obtained by reacting an epoxy compound (a) having two or more epoxy groups in a molecule with a monocarboxylic acid compound (b) having an ethylenically unsaturated group in a molecule, with a diisocyanate compound (d).

Abstract: Disclosed is an adhesive which enables to obtain a bonded optical disk, wherein optical disks having a total reflection film or a translucent reflection film made of silver or a silver alloy are bonded together, which exhibits high adhesion strength between the reflection film and a cured product of the adhesive as well as between a polycarbonate substrate and the cured product of the adhesive, while having high durability equivalent to those of the conventional optical disks using translucent reflective film made of gold.

Abstract: The present invention enables to provide a highly durable protective coating film or adhesive layer for high-density optical disks with less warp, which is superior in transmission for blue lasers, transparency and low water-absorption, by using an ultraviolet-curing resin composition essentially comprising a compound (A) represented by the following general formula (I), [Chemical Formula 7], (wherein, R represents each independently a hydrogen atom or a C1-C3 alkyl group, and n and m each represents the number of repetition from 0 to 5) and a photopolymerization initiator.

Abstract: The present invention provides an adhesive composition (a UV-curable resin composition) comprising a bisphenol type epoxy(meth)acrylate (A), a di(meth)acrylate compound (B) having a cyclic ether structure, and a photo-polymerization initiator (C), and a bonded optical disk which is adhered with a cured product of said adhesive composition. By adhering with said composition optical disk substrates having a translucent reflection film or a total reflection film comprising silver, a silver alloy, or the like, and obtaining a bonded optical disk, high durability equivalent to those of conventional bonded optical disks in which a translucent reflection film of gold is used, and high adhesion strength between a reflection film and an adhesive cured product, and a polycarbonate substrate and an adhesive cured product, can be obtained.

Abstract: The present invention provides an adhesive that can provide an excellent durability (reliability) to a bonded optical disk having a translucent reflection film comprising silicone, silver or a silver alloy. The adhesive of the present invention contains a (meth)acrylate monomer (A) having a solution resistance of 1.0×1010 ?·cm or more.

Abstract: A UV-cure adhesive for bonding an optical disk substrates one or both of which having a semitransparent reflective film of silver, a silver alloy, or the like. The thus produced bonded optical disk has a high durability equivalent to those of optical disks using a conventional gold semitransparent reflective film and is free of voids (air bubbles) that might be produced while the optical disk is manufactured by an optical disk manufacturing apparatus. The degradation in reflectance of the semitransparent reflective film can be suppressed even when the produced optical disk is exposed to direct sunlight for a long time. A UV-cure adhesive resin composition for bonding optical disk substrates contains (A) an epoxy (meth)acrylate, 2,2-dimethoxy-1,2-diphenylethan-1-one and (E) a monofunctional, bifunctional, trifunctional (meth)acrylate monomer, and has an electrical resistivity of 1000 M?·cm or less at 25° C.

Abstract: The present invention provides an adhesive that can provide an excellent durability (reliability) to a bonded optical disk having a translucent reflection film comprising silicone, silver or a silver alloy. The adhesive of the present invention contains a (meth)acrylate monomer (A) having a solution resistance of 1.0×1010 &OHgr;·cm or more.

Abstract: An ultraviolet-curable adhesive composition comprising a photopolymerization initiator whose molar absorption coefficient at a wavelength of 360-450 nm is at least 400 and an ultraviolet-curable compound. The adhesive composition of this invention can bond substrates which show transmittances of 0.01-20% to all of energy beams of a wavelength of 280-380 nm, to one another.

Abstract: An ultraviolet-curable adhesive composition comprising a photopolymerization initiator whose molar absorption coefficient at a wavelength of 360-450 nm is at least 400 and an ultraviolet-curable compound. The adhesive composition of this invention can bond substrates which show transmittances of 0.01-20% to all of energy beams of a wavelength of 280-380 nm, to one another such as base boards for an optical disk.

Abstract: The present invention aims to develop a photosensitive resin composition which exhibits a rapid ink absorption rate, which has an excellent water resistance, and which is appropriate for providing an ink receiving layer forming a sharp ink dot shape and having an excellent color formability of ink. A photosensitive resin composition forming an excellent ink receiving layer is obtained by incorporating at least one selected from an ethylenically unsaturated group-containing compound having quaternary nitrogen and a grain flour (filler) such as a wheat flour or the like in a photosensitive resin composition containing a quaternary nitrogen-free ethylenically unsaturated group-containing compound, a photopolymerization initiator etc.

Abstract: An ultraviolet-curable adhesive composition which comprises (A) a bisphenol type epoxy (meth)acrylate having a molecular weight of 450 to 3,000, (B) a urethane (meth)acrylate having a molecular weight of 400 to 10,000, (E) a (meth)acrylate monomer other than (A) and (B), and (F) a photopolymerization initiator, and an article having a cured layer of the above adhesive composition.