Abstract: In a thermal sensitive recording medium comprising a thermal sensitive color developing layer which includes a basic leuco dye and an organic color developer on a substrate, characterized by the said thermal color developing layer includes 0.01-0.9 parts of aminobenzenesulfonamide derivatives indicated by general formula (I) based on 1 part of color developer and also includes at least one kind of methylolated fatty acid amide indicated by general formula (II) in proportion of 0.01-2 parts based on 1 part of color developer. ##STR1## (wherein, "X" indicates an oxygen or sulfur atom, "R" indicates non-substituted or substituted phenyl group, naphthyl group, aralkyl group, lower alkyl group of carbon number 1-6, cycloalkyl group of carbon number 3-6 or lower alkenyl group of carbon number 2-6. "Z" indicates lower alkyl group of carbon number 1-6 or electron attractive group. "n" indicates an integer from 0 to 4 and "P" indicates an integer from 1 to 5, wherein satisfies the numerical formula of n+p.ltoreq.5)R.

Abstract: A thermal recording medium comprising a substrate having thereon a recording layer containing a colorless or pale colored dye precursor, and a color developer reactable with the dye precursor to develop a color as main ingredients, wherein the color developer includes at least one compound of Formula (1): and the recording layer contains at least one methylolated fatty acid amide of Formula (2): ##STR1## (wherein X denotes oxygen atom or sulfur atom; and R denotes substituted or unsubstituted phenyl group, naphthyl group, aralkyl group, a lower alkyl group of 1 to 6 carbon atoms, a cycloalkyl group of 3 to 6 carbon atoms, or a lower alkenyl group of 2 to 6 carbon atoms. Z denotes a lower alkyl group of 1 to 6 carbon atoms or an electron attracting group. n is an integer from 0 to 4, and p is an integer from 1 to 5, satisfying n+p .ltoreq.5.).R.sub.1 -CONHCH.sub.2 OH (2)(wherein R.sub.1 denotes an alkyl group of 11 to 21 carbon atoms).

Abstract: A thermal sensitive recording sheet comprising a substrate having thereon a thermal sensitive color developing layer mainly composed of basic leuco dye and an organic color developer, characterized by said thermal sensitive developing layer includes derivatives of amino benzene sulfone amide indicated by general formula (I) as an organic color developer, and includes sulfone amide compound indicated by general formula (II) as a sensitizer by amount of 0.01-2 parts based on 1 part of the color developer indicated by general formula (I). ##STR1## wherein "X" indicates an oxygen or sulfur atom, "Y" indicates a lower alkyl group of carbon number 1-4 or electron attracting group and "m" indicates an integral number from 0 to 4. "R" indicates a non-substituted or a substituted phenyl group, aralkyl group, lower alkyl group of carbon number 1-6, cycloalkyl group of carbon number 3-6, lower alkenyl group of carbon number 2-6 or naphthyl group.

Abstract: Discloses a thermal sensitive recording sheet which has features of high sensitivity, excellent heat resistance, excellent water proof and excellent durability to oil. The thermal sensitive color developing layer is mainly composed of a basic achromatic dye including the compound indicated by general formula (I) or (II), an organic color developer and a stabilizer indicated by general formula (III). And the said layer is arranged on a substrate and forms the thermal sensitive recording sheet.

Abstract: To provide a reversible multi-color thermal recording medium or a reversible multi-color optical recording medium which uses novel urea and thiourea derivatives and has excellent heat resistance.A reversible multi-color thermal recording medium having an irreversible thermal composition containing a colorless or pale basic achromatic dye and an organic color developer as main components and a reversible thermal composition containing a colorless or pale basic achromatic dye and an organic color developer as main components laminated on a support, the organic color developer contained in the irreversible thermal composition being an irreversible heat-resistant color developer and the organic color developer contained in the reversible thermal composition being a reversible heat-resistant color developer.

Abstract: An optical recording medium including a substrate having thereon a recording layer containing a dye precursor, a color developer reactable with the dye precursor to develop a color, and a light absorbent for converting light to heat, characterized in that the color developer is at least one compound of Formula (1):(R--NH (C.dbd.S) NH)n--Z (1)(wherein R denotes a substituted or unsubstituted alkyl, cycloalkyl, aryl, aralkyl, or alkenyl. n is an integer of 2 or more, and Z denotes a group having a valence of 2 or more.). The optical recording medium is superior in heat resistance and plasticizer resistance of the recorded image, heat resistance of background, water resistance, and moisture resistance.).

Abstract: In a thermal recording medium or an optically recordable thermal recording medium including a substrate having thereon a recording layer containing a colorless or pale colored dye precursor and a color developer reactable with the dye precursor to develop a color as main ingredients, the color developer includes at least one aminobenzenesulfonamide derivative of Formula (1): ##STR1## (wherein X denotes oxygen atom or sulfur atom; and R denotes substituted or unsubstituted phenyl group, naphthyl group, aralkyl group, a lower alkyl group of 1 to 6 carbon atoms, cycloalkyl group, or a lower alkenyl group of 2 to 6 carbon atoms. Z denotes a lower alkyl group of 1 to 6 carbon atoms or an electron attracting group. n is an integer from 0 to 4.).

Abstract: A thermal recording sheet wherein a compound of Formula (I) or (II) is contained in a thermal color developing layer including a basic colorless dye and an organic color developer as main ingredients: ##STR1## (wherein A denotes hydrogen atom, an alkyl group of C.sub.1 to C.sub.4, an alkoxy group of C.sub.1 to C.sub.4, hydroxy group, or nitro group. R.sub.1, R.sub.2, and R.sub.3 are hydrogen atom, an alkyl group of C.sub.1 to C.sub.4, an alkoxy group of C.sub.1 to C.sub.4, hydroxy group, or nitro group. R.sub.1 and R.sub.2 may combine with each other to form an aromatic ring. Y is sulfur or oxygen atom.), ##STR2## (wherein B denotes hydrogen atom, an alkyl group of C.sub.1 to C.sub.4, an alkoxy group of C.sub.1 to C.sub.4, hydroxy group, or nitro group. R.sub.1, R.sub.2, and R.sub.3 are hydrogen atom, an alkyl group of C.sub.1 to C.sub.4, an alkoxy group of C.sub.1 to C.sub.4, hydroxy group, or nitro group. R.sub.1 and R.sub.2 may combine with each other to form an aromatic ring. Y is sulfur or oxygen atom.).

Abstract: It is provided with a thermal recording material having a support coated with a coating solution as a color developing layer. The color developing layer has a colorless dye precursor which is normally colorless or light-colored, and a developer which reacts with the dye precursor to cause color development thereof upon heating. The developer is a bisthiourea compound represented by, for example, a formula (A-2): ##STR1## and the thermal color developing layer contains no sensitizer. In the thermal recording materials of the present invention, substantially no color is developed at a temperature of 120.degree. C. while color development can be caused in response to heating with a thermal head or a laser beam. The developed color on the material can be erased upon contacting with alcoholic solvents, depending on the thiourea compound contained in the color developing layer. After erasure of the image, the material can be used again for recording with a thermal head or a laser beam.

Abstract: A dispersion of a carbonate type blocked color developer having a hydroxyl group having a color developing function which is blocked by an O-substituted oxycarbonyl group (--(C.dbd.O)OR.sub.1), and a metal salt of an organic acid or inorganic acid or a leuco dye are mixed to obtain an opaque undeveloped coating color, and the coating color is coated on paper or the like to obtain a recording sheet. Also, the coating color is further mixed with a light absorbent to obtain an opaque undeveloped coating color, which is coated on paper or the like to obtain an optical recording sheet.

Abstract: A transparent recording medium is disclosed which can directly record a fine, precise image. With the recording medium, a compact, fine image occupying a small storage space can be easily enlarged and confirmed by an enlarged projection. It is prepared by applying a coating liquid for recording comprising a developer in which a hydroxyl group with a developing function is blocked by an N-substituted carbamoyl group or an O-substituted oxycarbonyl group, an iron salt of an organic acid or a leuco dye, a near-infrared absorbing agent, and a binder, uniformly dissolved in an organic solvent such as MEK, to a transparent plastic substrate, and drying to obtain a transparent recording layer with a thickness of 3 .mu.m to 8 .mu.m. A visible, precise, fine direct image can then be recorded using a semiconductor laser beam.

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: 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: A novel optical recording medium is here disclosed in which an underlayer and a heat-sensitive color-developing layer are laminated in this order onto a base material, the underlayer containing a near infrared absorbent, the heat-sensitive color-developing layer containing a basic colorless dye and an organic developer. The near infrared absorbent may be a dispersible near infrared absorbent which absorbs a wave length in a near infrared region of 0.7 to 2.5 .mu.m, and this dispersible near infrared absorbent is graphite, copper sulfide, lead sulfide, black titanium or tri-iron tetroxide. A transparent protective layer may be superimposed on the heat-sensitive color-developing layer.