7 results about "Leuco dye" patented technology

Disclosed is a heat-sensitive recording body which has, on one side of a paper support, a primer layer containing hollow particles having a hollow ratio of 80 to 98% and a heat-sensitive recording layer containing a leuco dye and a color developer in this order, and on the other side of the paper support, a back layer containing a pigment, wherein the back layer has a Gurley smoothness of 500 seconds or more, and the hollow particles are contained in a proportion of 5 to 30% by mass in the total solid content of the primer layer.

A solid writing body comprising a leuco dye, a long-chain fatty acid ester, and a solvent capable of dissolving or dispersing the leuco dye.

Disclosed is a heat-sensitive recording body which comprises, on a supporting body, at least a heat-sensitive recording layer that contains a leuco dye, a developer, and an adhesive. The heat-sensitive recording body is characterized in that the heat-sensitive recording layer contains, as a main first developer, an N, N'-diarylurea-based compound represented by general formula (1) (wherein R2 represents an alkyl group having 1 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms, or an aryl group having 6 to 12 carbon atoms, the aralkyl group and the aryl group may be substituted by an alkyl group having 1 to 12 carbon atoms, an alkoxy group having 1 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms, or a halogen atom, and the plurality of R2 moieties may be the same or different, A1 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and the plurality of A1 moieties may be the same or different), and contains, as a second developer, at least one compound that is selected from the group consisting of a urea urethane compound represented by general formula (2) and 5-(N-3-methylphenyl-sulfonamide)-N',N"-bis-(3-methylphenyl)-isophthalic acid diamide.

The present application relates to the technical field of pigment material, and particularly relates to a water-caused fading pigment block and application thereof. The pigment block is in a solid block structure, and is prepared from leuco dye, anhydrous calcium sulfate, organic weak acid, water-soluble binder, humectant, dispersant, preservative, pH regulator and deionized water, wherein the leuco dye is a fluoran dye with a lactone ring closed structure, and the anhydrous calcium sulfate is used as an inorganic forming skeleton material. By controlling the component ratio and particle size range, the forming property of the pigment slurry and the system stability are considered. The pigment block can be coated on the surface of a water-impermeable substrate by kneading or externally applying oxalic acid aqueous solution, and can be removed by water wiping or washing. The pigment block has stable structure, simple preparation process, is suitable for use in a block form, and meets the requirements of repeated writing or coating and water washing removal.

To provide a thermal recording medium with excellent alcohol resistance, heat resistance, and bleach resistance. [Solution] A thermal recording body comprising a thermal recording layer on a support containing at least a leuco dye, a color developer and an adhesive, wherein the main first color developer of the thermal recording layer is general formula (1): TIFF2026090861000008.tif30170 It contains a compound represented by the formula (2): TIFF2026090861000009.tif22170 A thermal recording body characterized by containing a urea urethane compound represented by and at least one selected from 5-(N-3-methylphenyl-sulfonamide)-N',N''-bis-(3-methylphenyl)-isophthalic acid diamide.

This invention discloses a highly stable and antioxidant thermosensitive color-developing patch and its preparation method. The highly stable and antioxidant thermosensitive color-developing patch is composed of a base layer, a thermosensitive color-developing layer, and a protective layer, sequentially composited. The thermosensitive color-developing layer, by mass parts, comprises the following components: 8-15 parts of leuco dye, 12-20 parts of color developer, 15-25 parts of modified lignin color-developing synergist, 8-15 parts of selenium ether-based temperature-controlled antioxidant, 10-12 parts of freeze-dried rosemary essential oil nanoliposomes, and diformyl xylose. The invention comprises 7-8 parts sensitizer, 10-18 parts binder, 30-50 parts solvent, 2-5 parts auxiliary antioxidant, and 3-7 parts plasticizer. It utilizes four core components—modified lignin color-developing synergist, selenium ether-based temperature-controlled antioxidant, freeze-dried rosemary essential oil nanoliposomes, and diformyl xylose sensitizer—to form a synergistic system that replaces traditional bisphenol color-developing agents and single antioxidants. This solves the technical problems of poor antioxidant properties, insufficient color-developing stability, and potential safety hazards in existing technologies.

This invention relates to a corrugated cardboard box with color-changing markings and its manufacturing process, belonging to the field of cardboard box manufacturing. The surface of the corrugated cardboard box has a color-changing marking area, which, from bottom to top, includes: a pre-coating layer containing a color developer, and a layer of functionalized porous polymer particles loaded with a leuco dye and a phase-change organic medium. The key feature is that when the ambient temperature exceeds the phase-change temperature of the organic medium, the medium melts into a liquid state and carries the dye to the pre-coating layer, where it comes into contact with the color developer and undergoes an irreversible color-changing reaction, forming a bright blue-purple warning marking.