Abstract: A curable resin composition including components (A), (B), (C) and (D) below: component (A): a bisphenol epoxy resin with a softening point of 80° C. or more, component (B): a bisphenol epoxy resin which is liquid at 25° C., component (C): a bi- or more-functional (meth)acrylate compound, and component (D): a curing agent.

Abstract: A curable resin composition including components (A), (B), (C) and (D) below: component (A): a bisphenol epoxy resin with a softening point of 80° C. or more, component (B): a bisphenol epoxy resin which is liquid at 25° C., component (C): a bi- or more-functional (meth)acrylate compound, and component (D): a curing agent.

Abstract: A curable resin composition including components (A), (B), (C) and (D) below: component (A): a bisphenol epoxy resin with a softening point of 80° C. or more, component (B): a bisphenol epoxy resin which is liquid at 25° C., component (C): a bi- or more-functional (meth)acrylate compound, and component (D): a curing agent.

Abstract: An optical information medium having a light transmission layer obtained by curing a composition containing a urethane di(meth)acrylate (A) of the formula (I) and the other urethane di(meth)acrylate (B), and having a tensile elastic modulus of 600 to 1300 MPa at 25° C. and a light transmittance of 80% or more at wavelength of 400 nm (in the formula, R1=an alicyclic diisocyanate residue, R2=an alkylene group or an organic group containing a cycloalkyl group or ester bond, R3=H or methyl group.

Abstract: The present invention relates to an active energy ray curable composition for coating optical disc, comprising a urethane (meth)acrylate compound having at least one amide group in the molecule, an ethylenically unsaturated compound other than the urethane (meth)acrylate compound and a photopolymerization initiator; and an optical disc having a cured coating layer obtained by curing the composition.

Abstract: The present invention relates to an active energy ray curable composition for coating optical disc, comprising a urethane (meth)acrylate compound having at least one amide group in the molecule, an ethylenically unsaturated compound other than the urethane (meth)acrylate compound and a photopolymerization initiator; and an optical disc having a cured coating layer obtained by curing the composition.

Abstract: The present invention relates to an active energy ray curable composition for coating optical disc, comprising a urethane (meth)acrylate compound having at least one amide group in the molecule, an ethylenically unsaturated compound other than the urethane (meth)acrylate compound and a photopolymerization initiator; and an optical disc having a cured coating layer obtained by curing the composition.

Abstract: The present invention relates to an active energy ray curable composition for coating optical disc, comprising a urethane(meth)acrylate compound having at least one amide group in the molecule, an ethylenically unsaturated compound other than the urethane(meth)acrylate compound and a photopolymerization initiator; and an optical disc having a cured coating layer obtained by curing the composition.

Abstract: The present invention relates to an active energy ray curable composition for coating optical disc, comprising a urethane (meth)acrylate compound having at least one amide group in the molecule, an ethylenically unsaturated compound other than the urethane (meth)acrylate compound and a photopolymerization initiator; and an optical disc having a cured coating layer obtained by curing the composition.

Abstract: An optical information medium having a light transmission layer obtained by curing a composition containing a urethane di(meth)acrylate (A) of the formula (I) and the other urethane di(meth)acrylate (B), and having a tensile elastic modulus of 600 to 1300 MPa at 25° C. and a light transmittance of 80% or more at wavelength of 400 nm (in the formula, R1=an alicyclic diisocyanate residue, R2=an alkylene group or an organic group containing a cycloalkyl group or ester bond, R3=H or methyl group.

Abstract: Crosslinked fine particles having a Tg of 100° C. or higher and an amount of remaining double bonds of 0.01 mmol/g or more, which are obtainable by polymerizing a compound (a1) having one or two radical-polymerizable ethylenic unsaturated groups in the molecule and a compound (a2) having three or more (meth)acryloyl groups in the molecule.

Abstract: The present invention relates to an active energy ray curable composition for coating optical disc, comprising a urethane (meth)acrylate compound having at least one amide group in the molecule, an ethylenically unsaturated compound other than the urethane (meth)acrylate compound and a photopolymerization initiator; and an optical disc having a cured coating layer obtained by curing the composition.

Abstract: Crosslinked fine particles having a Tg of 100° C. or higher and an amount of remaining double bonds of 0.01 mmol/g or more, which are obtainable by polymerizing a compound (a1) having one or two radical-polymerizable ethylenic unsaturated groups in the molecule and a compound (a2) having three or more (meth)acryloyl groups in the molecule.

Abstract: Crosslinked fine particles having a Tg of 100° C. or higher and an amount of remaining double bonds of 0.01 mmol/g or more, which are obtainable by polymerizing a compound (a1) having one or two radical-polymerizable ethylenic unsaturated groups in the molecule and a compound (a2) having three or more (meth)acryloyl groups in the molecule.

Abstract: A photopolymerizable composition comprising (A) 100 parts by weight of a mixture of (meth)acrylic acid ester monomers, (B) from 0.1 to 5 parts by weight of a surfactant having a perfluoroalkyl group and represented by the general formula (1) CF3(CF2)nAM  (1) wherein A represents —CO2— or —SO3—, M represents an alkali metal, and n is an integer of 3 to 9, and (C) from 0.2 to 10 parts by weight of a photopolymerization initiator, and a plastic optical disk provided with a cured coating of the photopolymerizable composition on at least one side thereof.

Abstract: A photopolymerizable composition comprising(A) 100 parts by weight of a mixture of (meth)acrylic acid ester monomers,(B) from 0.1 to 5 parts by weight of a surfactant having a perfluoroalkyl group and represented by the general formula (1)CF.sub.3 (CF.sub.2).sub.n AM (1)wherein A represents --CO.sub.2 -- or --SO.sub.3 --, M represents an alkali metal, and n is an integer of 3 to 9, and(C) from 0.2 to 10 parts by weight of a photopolymerization initiator, and a plastic optical disk provided with a cured coating of the photopolymerizable composition on at least one side thereof.