Ultraviolet-curable adhesive composition for bonding opaque substrates
First Claim
1. A method for preparing an information recording medium comprising coating the ultraviolet-curable adhesive composition on a substrate which is a base board for an optical disk, said base board showing transmittance of 0.01-20% at all wavelengths of energy beams in the region not less than 280 nm but not more than 380 nm, and thereafter firmly contacting the coating surface of this substrate with another substrate, and then irradiating any of said substrate, said another substrate, or both with ultraviolet rays without the use of heat;
- said ultraviolet-curable adhesive composition comprising 2,4,6trimethylbenzoldiphenylphosphie oxide as a photopolymerization initiator and an ultraviolet-curable compound which is a resin composed of 20-95 w/w % of a monomer having at least one (meth)acryloyl group in the molecule and 5-80 w/w % of an oligomer having at least two (meth)acryloyl groups in the molecule;
said another substrate shows transmittance of 0.01-20% at all wavelengths of energy beams in the region not less than 280 nm but no more than 380 nm.
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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.
61 Citations
5 Claims
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1. A method for preparing an information recording medium comprising coating the ultraviolet-curable adhesive composition on a substrate which is a base board for an optical disk, said base board showing transmittance of 0.01-20% at all wavelengths of energy beams in the region not less than 280 nm but not more than 380 nm, and thereafter firmly contacting the coating surface of this substrate with another substrate, and then irradiating any of said substrate, said another substrate, or both with ultraviolet rays without the use of heat;
- said ultraviolet-curable adhesive composition comprising 2,4,6trimethylbenzoldiphenylphosphie oxide as a photopolymerization initiator and an ultraviolet-curable compound which is a resin composed of 20-95 w/w % of a monomer having at least one (meth)acryloyl group in the molecule and 5-80 w/w % of an oligomer having at least two (meth)acryloyl groups in the molecule;
said another substrate shows transmittance of 0.01-20% at all wavelengths of energy beams in the region not less than 280 nm but no more than 380 nm. - View Dependent Claims (2, 3, 4, 5)
- said ultraviolet-curable adhesive composition comprising 2,4,6trimethylbenzoldiphenylphosphie oxide as a photopolymerization initiator and an ultraviolet-curable compound which is a resin composed of 20-95 w/w % of a monomer having at least one (meth)acryloyl group in the molecule and 5-80 w/w % of an oligomer having at least two (meth)acryloyl groups in the molecule;
Specification