Abstract: A non-resonant two-photon absorbing material is provided, comprising a methine dye undergoing a non-resonant two-photon absorption, in which the methine dye is preferably a cyanine dye, a merocyanine dye or an oxonol dye, and a non-resonant two-photon absorbing material is provided, comprising a non-resonant two-photon absorbing compound undergoing non-resonant two-photon absorption in the intermolecular aggregation state.

Abstract: A heat-sensitive lithographic printing plate precursor is disclosed which comprises a hydrophilic support and a coating provided thereon, wherein the coating comprises an infrared light absorbing cyanine dye, the dye containing a bridged methine chain and from three to five groups which are anionic or which become anionic in an aqueous alkaline solution having a pH of at least 9. Such dyes provide high sensitivity and low dye stain after processing.

Abstract: An optical information recording medium has a recording layer composed essentially of an oxonol compound of the following formula: 1

Abstract: A dye-in-polymer composition for in fluorescent WORM discs comprises about 0.1 to 10% by weight of a fluorescent dye capable of absorbing laser radiation and transforming the absorbed light into heat; about 10 to 80% by weight of nitrocellulose and a film forming polymer. The dye containing solution is applied to substrate of an optical reading medium by a spin, roller or dip coating. The method utilizes a focused laser beam for scanning the recording layer.

Abstract: An optical information recording medium with a recording layer enables a recording and reproducing to be effected with a 650 nm (or further) laser beam, and the recording layer contains at least one kind of the trimethine-cyanine dye which is a compound represented by the following general formula [1], [2], [3], [4]. The “EWG” represents any electron-withdrawing substituted group such as cyano or nitro group.

Abstract: An information recording medium is disclosed, comprising a substrate having provided thereon a recording layer capable of recording information by a laser ray, wherein the recording layer contains a dye compound represented by formula (I-1): wherein R1, R2, R3 and R4 each independently represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aralkyl group or a substituted or unsubstituted heterocyclic group, L1, L2 and L3 each independently represents a methine group which may have a substituent, m represents 0, 1, 2 or 3, Xk+ represents a cation and k represents an integer of from 1 to 10, provided that when m is 2 or 3, the plurality of L2 and L3 groups may be the same or different. Also disclosed is an information recording method using the above-described information recording medium.

Abstract: The present invention provides a two-photon light-emitting compound represented by formula (1), an optical data recording medium capable of recording data with a laser beam comprising a compound represented by formula (1) and a two-photon polymerizable composition photopolymerizable by two-photon absorption comprising a polymerizable monomer or polymerizable oligomer and at least a two-photon absorption material being a compound represented by formula (1):

Abstract: A cyanine dye (I) for using in high density optical disc recording medium, having the following structure: in which R1 represents R2 represents and alkyl with C1-C18 or X− represents an acid anion. This cyanine dye is suitable for use as a &lgr;=500 nm−650 nm visible light-absorbing organic dye useful as a high density optical disc recording medium.

Abstract: Optical data medium containing a preferably transparent substrate which is optionally already coated with one or more barrier layers and on the surface of which an information layer which can be recorded on using light, optionally one or more barrier layers, and a cover layer, have been applied, which data medium can be recorded on and read using focused blue light through the cover layer on the information layer, preferably laser light with the wavelength between 360 nm and 460 nm, the information layer containing a light-absorbing compound and optionally a binder, characterized in that at least one dye is used as the light-absorbing compound wherein the cover layer on the top of the information layer including the adhesive layer do have a total thickness of 10 &mgr;m to 177 &mgr;m and the numerical aperture NA of the focusing objective lens setup is greater or equal 0.8.

Abstract: An optical information recording disc showing good recording characteristics is prepared by the steps of coating a dye solution of a laser light-sensitive dye in a fluorinated cyclic alkane or alkene on a transparent substrate disc and drying the coated dye solution. The fluorinated cyclic alkane or alkene can be employed in combination with other organic solvents.

Abstract: The object of the present invention is to provide organic dye compounds which exert satisfactory optical absorption properties and thermal resistance when used in high density optical recording media. The above object is solved by specific trimethine cyanine dyes, light absorbents and optical recording media which comprise the cyanine dyes, and preparations for the cyanine dyes comprising either reacting a benzoindolium compound having a compatible leaving group with a pyrazinoimidazolium compound having a reactive methyl group; or reacting a benzoindolium compound having a reactive methyl group with a pyrazinoimidazolium compound having a compatible leaving group.

Abstract: An optical information recording medium comprising a substrate having thereon a recording layer capable of information recording by laser irradiation, wherein said recording layer contains a dye compound represented by the following formula (I), (II) or (III): R11R12N+═L11—L12═L13—NHR13.(1/m)(X1)m−  (I) R21R22N—L21═L22—L23═NR23  (II) R31R32N+═L32═L33—NR33R34.(1/n)(X3)n−  (III). The meanings of the symbols are defined and explained in the specification. Also discussed is a method for recording information using the optical information recording medium.

Abstract: The present invention is directed to styryl dyes having the formula: 1

Abstract: Optical data carrier comprising a preferably transparent substrate which may, if desired, have previously been coated with one or more reflection layers and to whose surface a light-writeable information layer, if desired one or more reflection layers and if desired a protective layer or a further substrate or a covering layer have been applied, which can be written on or read by means of blue, red or infrared light, preferably laser light, where the information layer comprises a light-absorbent compound and, if desired, a binder, characterized in that at least one cationic aminoheterocyclic dye is used as light-absorbent compound.

Abstract: Optical data carrier comprising a preferably transparent substrate which may, if desired, have previously been coated with one or more reflection layers and to whose surface a light-writeable information layer, if desired one or more reflection layers and if desired a protective layer or a further substrate or a covering layer have been applied, which can be written on or read by means of blue, red or infrared light, preferably laser light, where the information layer comprises a light-absorbent compound and, if desired, a binder, characterized in that at least one merocyanine dye is used as light-absorbent compound.

Abstract: An object of the invention is to provide a method for preparing an optical recording medium, featuring a high production yield, a reduced loss and a high utilization of dye solution, and ensuring to produce media of consistent quality even by continuous coating as well as an optical recording medium. The object is achieved by a method for preparing an optical recording medium, comprising the step of applying a solution of a dye in a solvent onto a resin substrate to form a dye film, wherein the solvent of the dye solution is a mixture of tetrafluoropropanol and/or octafluoropentanol with an aliphatic saturated alcohol of 1 to 4 carbon atoms, and a recording layer is formed by applying the dye solution.

Abstract: An optical information recording medium composed of a substrate and a recording layer having a dye compound of the formula (I): R1R2C═L1—L2═L3—NR3R4  (I) in which each of R1 and R2 is an electron-attracting group (i.e., electron-withdrawing group) having a Hammett's substituent constant &sgr;p in the range of 0.2 to 0.

Abstract: An information recording medium is disclosed, comprising a substrate having provided thereon a recording layer capable of recording information by a laser ray, wherein the recording layer contains a dye compound represented by formula (I-1): 1

Abstract: A hemicyanine dye having formula (1) and an optical recording medium using the hemicyanine dye as an optical recording medium are provided: 1

Abstract: Disclosed are novel trimethine cyanine dyes, light absorbents, light-resistant improvers, and optical recording media which comprise the trimethine cyanine dyes. The cyanine dyes exert satisfactory solubility and heat resistance when used in high-density optical recording media.

Abstract: An optical recording layer of an optical recording medium comprises a dye material represented by the formula (I), wherein R1 is a hydrogen atom, a methyl group, or an ethyl group, R2 and R3 each is, independent from each other, a substituted or unsubstituted C1 to C12 alkyl group, A⊖ is an anion selected from the group consisting of halogen atoms, ClO4⊖, BF4⊖, PF6⊖, SbF6⊖, CF3SO2⊖, C2F5SO3⊖, CF3COO⊖, and CH3C6H4SO3⊖, X is hydrogen, alkyl, alkoxy, halogen, nitro, or fused benzene, Y is hydrogen, alkoxy, halogen, alkyl, aryl, alkoxycarbonyl, aryloxycarbonyl, alkylamine, arylamine, alkylamide, arylamide, alkylsulfonyl, aryl sulfonyl, alkoxysulfonyl, aryloxysulfonyl, nitro, or cyano groups.

Abstract: A laser ablative recording material having on a support a coloring agent layer containing a fluorine-containing surfactant, in which the fluorine-containing surfactant is a copolymer made of: (Condition I) either or both of acrylate having a fluoroaliphatic group and methacrylate having a fluoroaliphatic group (the fluoroaliphatic group herein includes 3 to 20 carbon atoms and fluorine atoms of 40% or more by weight where a half or above of atoms bonded to three carbon atoms constituting terminal portions are fluorine atoms.); and (Condition II) either or both of poly(oxyalkylene) acrylate and poly(oxyalkylene) methacrylate, wherein monomer units according to Condition I are 20 to 80 percent by weight of the copolymer is disclosed. This laser ablative recording material has features of a uniform surface state and a uniform film thickness profile, a small Dmin of the laser exposure portion, and smaller deviations in a maximum density.

Abstract: In an optical recording medium using writing and reading light having a wavelength of up to 690 nm and having a recording layer and preferably a reflective layer, the recording layer contains a chelate compound having an azo compound of specific structure as a ligand (i.e., azo metal complex dye). This results in an optical recording medium of the heat mode having advantages including the dye's sufficient solubility in a coating solvent which does not attack polycarbonate substrates and improved write/read characteristics with light having a wavelength of up to 690 nm.

Abstract: A perishable media information storage mechanism, including a substrate, a data layer for recording data thereon the information storage mechanism, a reflective layer, and a protective lacquer coating. The data layer includes a material responsive to at least one predetermined data elimination factor and includes one of a decayable dye material, a liquid crystal material, a photosensitive material or a plurality of magnetoresistive memory cells. The data layer is characterized as recording data and eliminating access to data in response to at least one of a predetermined use or time factor. In addition, included is a method for fabricating a perishable media information storage mechanism including the steps of providing a substrate, forming a data layer on a surface of the substrate, forming a reflective layer on an uppermost surface of the data layer, and forming a protective coating on an uppermost surface of the reflective layer.

Abstract: A structure of an optical recording medium that mainly includes a first dielectric layer, a dye layer, a second dielectric layer, and a reflective layer formed on a substrate in sequence, and a method for fabricating an optical recording medium of the foregoing structure. The additional dielectric layers of the optical recording medium, instead of a quencher used in a conventional optical recording medium, increase the lifetime of a dye layer and reduce the fabrication cost. Furthermore, the additional dielectric layers are capable of isolating the dye layer from oxygen and moisture to enhance the lightfastness of the dye layer.

Abstract: An information recording medium is disclosed, comprising a substrate having provided thereon a recording layer capable of recording information by a laser ray, wherein the recording layer contains a dye compound represented by formula (I-1): wherein R1, R2, R3 and R4 each independently represents a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted aralkyl group or a substituted or unsubstituted heterocyclic group, L1, L2 and L3 each independently represents a methine group which may have a substituent, m represents 0, 1, 2 or 3, Xk+ represents a cation and k represents an integer of from 1 to 10, provided that when m is 2 or 3, the plurality of L2 and L3 groups may be the same or different. Also disclosed is an information recording method using the above-described information recording medium.

Abstract: By keeping the imaginary number portion k of the complex index of refraction of the film of the light absorbing layer 3, the mean film thickness dav of the light absorbing layer 3, and the absorbency A related thereto within an appropriate range, the present invention provides an optical information recording medium with good recording sensitivity and playback properties, which makes possible high speed recording by increasing the sensitivity to the recording beam and stable recording with sufficient reflectivity, and which can reduce jitter. In the present invention, 0.13≦A≦0.21 where A (Abs) is the absorbency of the light absorbing layer at the wavelength of the recording beam; and 6.0≦k.dav≦12.0 where k is the imaginary number portion of the complex index of refraction of the film in the light absorbing layer and dav (nm) is the mean film thickness of the light absorbing layer, at the wavelength of the recording beam.