Abstract: A hard-coating, heat-absorbing composition which is capable of absorbing near-infrared rays from sunlight and a heat-shielding substance is disclosed. The composition comprises a silicone varnish for hard-coating comprising polysiloxane and, dissolved therein, diphenylthiourea and copper monobutyl-o-phthalate. It can be applied to plastic substrate and heated to cure the silicone varnish, whereupon curing of polysiloxane and production of a heat-absorbing compound are simultaneously effected. The composition ensures to provide various substrates with a heat-shielding characteristic.

Abstract: A shading and light-responsive plate or film is composed or a transparent polymer containing a novel phthalic acid derivative metal salt and further near infrared ray shading plate or film is composed of a transparent polymer containing the aforesaid phthalic acid derivative copper salt or lead salt and a near infrared absorbing coloring material formed from a thioamide derivative or thiourea derivative.

Abstract: A shading and light-responsive plate or film is composed of a transparent polymer containing a novel phthalic acid derivative metal salt and further a near infrared ray shading plate or film is composed of a transparent polymer containing the aforesaid phthalic acid derivative copper salt or lead salt and a near infrared absorbing coloring material formed from a thioamide derivative or thiourea derivative.

Abstract: In an optical recording medium fitted on a substrate a recording layer containing a light absorbent which absorbs light having a central wave length in the near infrared region, performs thermal conversion of light energy and emits heat energy, and a heat-sensitive recording material, a high density image can be recorded with a small amount of laser irradiation by using a specific water soluble infrared absorbing compound as a light absorbent.

Abstract: A plate or a sheet being capable of absorbing near IR-rays, which is prepared by heating both at least a raw material of a transparent polymer and a mixture of a thiourea compound and a copper compound. This invention provides superior optical materials for shielding sunlight thermic rays, better information recording materials and the like.

Abstract: In an optical recording medium, a light absorbent can be incorporated into a color-developing layer without separately constituting a light absorbing layer by holding the light absorbent in a dispersed or dissolved state in a solvent soluble or heat fusible material. Thus, an optical recording medium which exhibits satisfactory image density with a small amount of the light absorbent can be provided.

Abstract: A shading and light-responsive plate or film is composed of a transparent polymer containing a novel phthalic acid derivative metal salt and further a near infrared ray shading plate or film is composed of a transparent polymer containing the aforesaid phthalic acid derivative copper salt or lead salt and a near infrared absorbing coloring material formed from a thioamide derivative or thiourea derivative.

Abstract: Features of the present invention are connected with an optical recording medium which comprises a substrate, a heat-sensitive color-developing layer containing a basic dye and an organic developer, and a light-absorbing layer containing a near infrared absorbent, the aforesaid layers being superposed upon the substrate, a reflectance at the dominant wave length of a laser beam on the surface of the recording medium being from 15% to 65%; a method for recording by irradiating the optical recording medium with a laser beam condensed by a condenser having a focal length of 0.5 mm or more and a numerical aperture (N.A) of 0.1 to 0.5; and a device for use in the above-mentioned method.

Abstract: A method of identifying the output energy, main wavelength, position, pattern, etc., of light, which comprises irradiating a photosensitive coloring medium comprising a base material, a heat-sensitive coloring material, and a light absorptive material releasing heat sufficient for coloring the heat-sensitive coloring material by absorbing the light and identifying the output energy, main wavelength, position, pattern, etc., of the light from the colored extent thereof.

Abstract: Features of the present invention are connected with an optical recording medium which comprises a substrate, a heat-senstive color-developing layer containing a basic dye and an organic developer, and a light-absorbing layer containing a near infrared absorbent, the aforesaid layers being superposed upon the substrate, a reflectance at the dominant wave length of a laser beam on the surface of the recording medium being from 15 to 65%; a method for recording by irradiating the optical recording medium with a laser beam condensed by a condenser having a focal length of 0.5 mm or more and a numerical aperture (N.A) of 0.1 to 0.5; and a device for use in the above-mentioned method.

Abstract: The present invention is related to an optical recording medium comprising a substrate, a light-absorbing layer containing a near infrared absorbent and a heat-sensitive color-developing layer, these layers being superposed upon the substrate. The near infrared absorbent which is used in the present invention is prepared by mixing and heating a thiourea derivative and a metallic compound. This near infrared absorbent has relatively uniform and strong absorption spectra all over the near infrared region, and therefore, on the optical recording medium of the present invention, an image having a high resolution can be directly obtained by the irradiation of the near infrared rays.