Abstract: A gas separation system includes a separation column for separating components contained in sample gas, a sample gas supplier fluidly connected to an inlet of the separation column for supplying sample gas to the separation column, a detector fluidly connected to an outlet of the separation column, a collection tube filled with an adsorbent having a property of adsorbing a target component in the sample gas under a condition of a first temperature or less and desorbing the adsorbed target component under a condition of a second temperature or more higher than the first temperature, a temperature adjuster for adjusting a temperature of the collection tube, a collection container for collecting the target component, and a switching mechanism for switching between a state in which the collection tube is connected to an outlet of the detector and a state in which the collection tube is connected to the collection container.

Abstract: A gas separation system includes a separation column for separating components contained in sample gas, a sample gas supplier fluidly connected to an inlet of the separation column for supplying sample gas to the separation column, a detector fluidly connected to an outlet of the separation column, a collection tube filled with an adsorbent having a property of adsorbing a target component in the sample gas under a condition of a first temperature or less and desorbing the adsorbed target component under a condition of a second temperature or more higher than the first temperature, a temperature adjuster for adjusting a temperature of the collection tube, a collection container for collecting the target component, and a switching mechanism for switching between a state in which the collection tube is connected to an outlet of the detector and a state in which the collection tube is connected to the collection container.

Abstract: The present invention provides organic dye compounds having their absorption maxima in a region ranging from the ultraviolet region to a relatively short wavelength visible region and uses thereof. The present invention provides specific monomethine cyanine dyes, light absorbents and optical recording media comprising the monomethine cyanine dyes, and a process for producing the monomethine cyanine dyes which comprises a step of reacting a quaternary ammonium salt of nitrogen atom-containing heterocyclic compound having a reactive methyl group with a quaternary ammonium salt of nitrogen atom-containing heterocyclic compound having an appropriate leaving group.

Abstract: The present invention provides styryl dyes which have absorption maxima at a wavelength of 400 nm or less and are sensitive to a laser beam with a wavelength of 450 nm or less, light absorbents and optical recording media which comprise the styryl dyes, and a process for producing the styryl dyes which comprises reacting with an aldehyde compound a quaternary ammonium salt of nitrogen atom containing heterocyclic compound having an active methyl or active methylene group.

Abstract: The present invention provides styryl dyes which have absorption maxima at a wavelength of 400 nm or less and are sensitive to a laser beam with a wavelength of 450 nm or less, light absorbents and optical recording media which comprise the styryl dyes, and a process for producing the styryl dyes which comprises reacting with an aldehyde compound a quaternary ammonium salt of nitrogen atom containing heterocyclic compound having an active methyl or active methylene group.

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: Optical recording media using mixtures of benzoindolenic trimethine cyanine dyes, where the first benzoindolenic trimethine cyanine dye bears a heterocyclic azo dye metal complex as the counterion and the second benzoindolenic trimethine cyanine dye has a different type of counterion. This combination of these benzoindolenic trimethine cyanine dyes coated on a substrate results in high density media, where the dyes have a high solubility and heat resistance.

Abstract: The present invention provides organic dye compounds having their absorption maxima in a region ranging from the ultraviolet region to a relatively short wavelength visible region and uses thereof. The present invention provides specific monomethine cyanine dyes, light absorbents and optical recording media comprising the monomethine cyanine dyes, and a process for producing the monomethine cyanine dyes which comprises a step of reacting a quaternary ammonium salt of nitrogen atom-containing heterocyclic compound having a reactive methyl group with a quaternary ammonium salt of nitrogen atom-containing heterocyclic compound having an appropriate leaving group.

Abstract: The present invention provides organic compounds which improve the light resistance of organic dye compounds without substantially deteriorating their preferable light properties when applied to them, and have satisfactory solubility in organic solvents and compatibility with organic dye compounds.

Abstract: The present invention provides organic dye compounds having their absorption maxima in a region ranging from the ultraviolet region to a relatively short wavelength visible region and uses thereof. The present invention provides specific monomethine cyanine dyes, light absorbents and optical recording media comprising the monomethine cyanine dyes, and a process for producing the monomethine cyanine dyes which comprises a step of reacting a quaternary ammonium salt of nitrogen atom-containing heterocyclic compound having a reactive methyl group with a quarternary ammonium salt of nitrogen atom-containing heterocyclic compound having an appropriate leaving group.

Abstract: The object of the present invention is to provide light absorbents which exert superior electrical properties in organic optical recording media and to uses thereof, and is solved by providing light absorbents comprising the first polymethine dye having an organic metal complex anion as a counter ion and a monomethine or polymethine chain intramolecularly, the second polymethine dye having an anion, as a counter ion, other than organic metal complex anions and a monomethine or polymethine chain intramolecularly, and a formazane metal complex; optical recording media which use the light absorbents; and a process for producing optical recording media which comprise a step of forming a homogeneous thin layer comprising the light absorbents on a substrate.

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: 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: The present invention provides organic dye compounds which exert excellent recording characteristics in high-density optical recording media, and uses thereof. The present invention solves the objects of the present invention by providing non-symmetric trimethine cyanine dyes having a specific structure and properties, light absorbents and optical recording media comprising the cyanine dyes, and a process for preparing the cyanine dye comprising a step of reacting either 3,3-dimethyl-5-nitroindolium compounds or 3,3-dimethyl-5-sulfonamideindolium compounds, which have a reactive methyl group or an appropriate leaving group, with 3,3-dimethylbezoindolium compounds, which have a reactive methyl group or an appropriate leaving group.

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

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: A dye and a heat transfer sheet for use in a heat transfer printing method employing a sublimable dye, capable of producing an image which has a sufficiently high density and is excellent in sharpness, fastness properties and, in particular, resistance to light are provided. The dye has the following formula (I): ##STR1## The heat transfer sheet includes a substrate sheet, and a dye layer including the dye having formula (I), provided on one surface of the substrate sheet.

Abstract: A novel organic compound, 7,7,8,8-tetracyanoquinodimethane having a higher alkyl group containing at least ten carbon atoms, may be formed in a monomolecular layer or film by Langmuir-Blodgett's technique.

Abstract: New dichroic dyestuffs for the guest-host type liquid crystal and new liquid crystal compositions containing said dyestuff having an excellent improved dichroism and being prepared by introducing at least one group selected from the group consisting of phenyl, cyclohexyl, phenylcarbonyloxy and phenyloxycarbonyl group into a phenyl, a cyclohexyl or a naphthyl group at its 4-position, which is arranged at the end of a known dichroic dyestuff molecule along the major axis of the molecule.

Abstract: In an electrophotographic photosensitive material comprising an electroconductive substrate having positioned thereon a photosensitive layer comprising as main components titanium dioxide and a binding material, the photosensitivity and whiteness can be improved by allowing a specific cyanine dye compound to exist in said photosensitive layer.