51 results about "Leuco dye" patented technology

To provide a thermally conductive grease composition which has high thermal conductivity, has excellent coatability, and allows a temperature distribution to be visually recognized.SOLUTION: A thermally conductive grease composition containing a base oil, a thermally conductive filler, and a capsule pigment encapsulating a leuco dye, a developer, and a color change temperature regulator.SELECTED DRAWING: None

According to the yellow leuco dye developing ink and the preparation method thereof disclosed by the invention, by optimizing the molecular structure of the yellow leuco dye and the matching relationship between the yellow leuco dye and a color developing agent, the ink can quickly develop under the conditions of low temperature, slight pressure or low-concentration acid / metal salt, the developing effect is distinct, and handwriting or patterns are clear and visible; by selecting a yellow leuco dye with better photostability of a color body after color development and introducing an antioxidant component, the color fading of a color development product under the irradiation of ultraviolet and visible light is effectively delayed, and the storage period of color development images and texts is prolonged; by improving an ink formula and a packaging process, the ink can keep good leuco stability in different environments such as high temperature, high humidity, low temperature and the like, and the phenomena of self color development, non-uniform color development and the like are prevented. The ink is colorless or light in color under normal conditions, can show bright yellow after being stimulated by acid, metal salt or heat, and has the characteristics of high color developing sensitivity, clean background and wide application range, and the comprehensive performance of the ink is remarkably improved.

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.

Provided is a heat-sensitive recording body which is environmentally friendly and has excellent water resistance and oil resistance as well as excellent color developing performance.　The heat-sensitive recording body has a heat-sensitive recording layer containing a colorless or light-colored electron-donating leuco dye and an electron-accepting developer on a support, wherein the electron-accepting developer is an isolated lignin, and the heat-sensitive recording layer contains toluenesulfonamide as a sensitizer.

The present disclosure relates to a composition for preparing a thermochromic solid marker, which enables the production of a color development means for a thermochromic writing instrument capable of being erased in response to a change in temperature in the form of a solid marker having desirable physical properties, and a preparation method for a thermochromic solid marker using the same. The composition for preparing a thermochromic solid marker comprises: 10 to 35 wt. % of microcapsule particles comprising a core composition containing a leuco dye and a developer, and a polymer resin shell surrounding the core composition; 5 to 20 wt. % of a gelling agent; 30 to 60 wt. % of water; and 0 to 10 wt. % of a glycol-based organic solvent.

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.

A readily findable dental appliance is provided having a shell with a plurality of tooth-receiving cavities shaped to receive and resiliently reposition teeth in a patient's mouth from a first arrangement toward a. second arrangement. At least one thermally-sensitive indicator is incorporated with at least a portion of the shell. The thermally-sensitive indicator includes a first temperature-activated thermochromic pigment, which preferably changes from a. first visible color when below a first temperature to a second substantially clear color when above the first temperature. The pigment preferably includes a leuco dye microencapsulated in a polymer such as melamine formaldehyde polymer. A second temperature-activated, thermochromic pigment may be provided, that changes from a. third substantially clear color when above a second temperature to a fourth visible color when below the second temperature, which is, e.g., approximately beverage-drinking temperature.

The invention belongs to the technical field of functional textiles, and relates to a temperature-sensitive color-changing microcapsule, a temperature-sensitive color-changing fabric and a preparation method of the temperature-sensitive color-changing microcapsule. The temperature-sensitive color-changing microcapsule comprises an outer shell layer, an inner shell layer and a core layer from inside to outside, the outer shell layer is made of silicon dioxide, the inner shell layer is made of melamine-urea-formaldehyde resin, the core layer is a temperature-sensitive color-changing mixture, and the temperature-sensitive color-changing mixture comprises temperature-sensitive color-changing leuco dye, a color developing agent and a phase change material. The temperature-sensitive color-changing microcapsule is low in temperature-sensitive color-changing response temperature, and the leakage rate of the temperature-sensitive color-changing mixture is low. The temperature-sensitive color-changing microcapsule is fixed on a fabric substrate, so that a temperature-sensitive color-changing fabric can be obtained, and the temperature-sensitive color-changing microcapsule can be widely applied to the technical field of functional textiles.

Disclosed is a heat-sensitive recording body, which is a heat-sensitive recording body provided with a primer layer formed on one side of a support and a heat-sensitive recording layer formed on the primer layer, the heat-sensitive recording layer containing a leuco dye and a color developer, the primer layer containing hollow particles and a binding resin, the maximum particle diameter (D100) of the hollow particles being 10 to 30 µm, the particle diameter (D50) of 50 vol% of the hollow particles being 4.0 to 15 µm, the ratio D100 / D50 of the maximum particle diameter (D100) to the particle diameter (D50) of the hollow particles being 1.8 to 3.0, and the vol% of the hollow particles having a particle diameter of 2.0 µm or less being 1% or less.

Disclosed is a heat-sensitive recording body which has, in order on a support, a primer layer containing hollow particles, a binder, and inorganic pigment I, and a heat-sensitive recording layer containing a leuco dye, a color developer, and inorganic pigment II, and which is characterized by containing, as the color developer, an N,N'-diaryl urea-based compound represented by the following formula (1) (in the formula, 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, and the aralkyl group and the aryl group are each optionally substituted with 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 each R2 can be the same as or different from the others, A1 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and each A1 can be the same as or different from the others), and, as the inorganic pigment II, a pigment having an oil absorption of 130 ml / 100 g or less,

The invention provides a hot compress material and a preparation method thereof.The hot compress material comprises a heating medium and at least one temperature change indicator mixed in the heating medium and used for monitoring the temperature of the heating medium, and the temperature change indicator is of a microcapsule structure with a core material and a wall material; the core material is composed of an electron-donating leuco dye, an electron-withdrawing color developing agent and a solvent, and the wall material is composed of resin. The visual temperature change indicator is added in the heating medium, so that the temperature change of each part of the hot compress material can be visually observed, and people can visually know whether the hot compress material reaches the preset temperature or not and whether the temperature of the hot compress material is consistent or not.

Provided is a heat-sensitive recording body having excellent cuttability of a heat seal layer. This heat-sensitive recording body has a heat seal layer including a water-dispersible resin binder on one side of a paper substrate, and a heat-sensitive recording layer including a colorless or light-colored electron-donating leuco dye and an electron-accepting developer on the other side of the substrate, and has an air resistance of 100,000 seconds or less.

Method and apparatus for producing a document body comprising a multilayer laminate and generating a multicolored, data-representing marking within the laminate. The method comprises: - Providing or creating an initial marking in or on an extensive substrate. The initial marking has several colored sub-areas, each forming only a part of the initial marking, such that the colors of at least two of the sub-areas differ from one another. At least one of the colors is caused, at least partially, by colorants that are or are designed as leuco-dyes, which, through the input of energy at the point of action, can be switched between a colored and a differently colored state, or between an opaque and at least partially transparent state, or vice versa. - Creating the laminate by laminating the base substrate as the first laminate layer with at least one further surface-extended substrate as each subsequent laminate layer such that the initial marking is located at least partially inside the produced laminate; - Causing an energy input into the laminate such that it acts locally selectively in the initial marking, whereby the multicolored marking representing the data is achieved at least partially from the initial marking by means of the locally selective switching of the leuco dye caused by the energy input into the initial marking.

The invention discloses a light pressure dual-sensitive leuco coating composition and compression-resistant anti-counterfeiting paper.The coating composition comprises a first component and a second component which are used for coating different areas of paper to form films, and the first component comprises composite dye microcapsule emulsion, an adhesive and a silane coupling agent; the second component comprises the following raw materials: a film-forming agent, a color developing agent, an auxiliary agent, a filler and an adhesive. The invention has the advantages that the leuco film layer formed by the first component has both the organic fluorescent dye and the leuco dye, not only can display fluorescence during ultraviolet irradiation, but also can develop color when the friction film layer formed by the second component applies pressure to the leuco film layer and rubs, and the two developing effects and the anti-counterfeiting effect are better; the leuco film layer and the friction film layer are arranged in different areas of the paper, under the condition that the leuco film layer and the friction film layer are not folded to make contact with each other, when one of the film layers is independently pressed, color development is avoided, and therefore in the coating process and the transportation process, the problem of accidental color development does not exist even if the film layers are pressed.

The present invention relates to the use of one or more of compounds of formula (I) wherein R1, R2, R3, R4, R5 and R6 are independent from each other selected from the group consisting of hydrogen, hydroxy, methyl, methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, sec-butoxy, tert-butoxy, pentoxy, isopentoxy, and neopentoxy, wherein at least two of R1, R2, R3, R4, R5 and R6 are different from hydrogen, and at least one of R1, R2, R3, R4, R5 and R6 is hydroxy, n is an integer between 1 and 5, and m is an integer between 1 and 5, as a color developer for leuco dyes.

A heat-sensitive recording medium includes a support, a heat-sensitive recording layer including a leuco dye and a developer disposed directly or indirectly on the support, and a protective layer disposed directly or indirectly on the heat-sensitive recording layer. The color developing agent includes a first color developing agent having a specific structure and a second color developing agent having a specific structure. The protective layer includes a resin including a styrene-maleic acid copolymer or a styrene-(meth) acrylic acid copolymer.

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 having good color developing sensitivity, printing running properties (especially head scum adhesion resistance) and scratch resistance and good printing fineness at the time of high speed printing, and its manufacturing method.SOLUTION: The thermosensitive recording body is obtained by providing a primer layer, a thermosensitive recording layer containing a colorless or light-colored electron-donating leuco dye, an electron-accepting developer and a sensitizing agent, and a protective layer in this order on a support, wherein the total content (solid content) of the leuco dye, the developer and the sensitizing agent in the thermosensitive recording layer is ≥ 70.0 wt.%, and the coating amount of the thermosensitive recording layer is ≤ 2.5g / m2.SELECTED DRAWING: None

Non-phenolic direct thermal recording media have a thermally responsive layer containing a leuco dye and a plurality of diarylurea acidic developers selected to improve the quality and readability of the image produced in such media, particularly after being contacted with oils such as vegetable oil. The diarylurea developers preferably include, or consist essentially of, or consist of, N,N′-diphenylurea (“DPU”) and a derivative of DPU. An exemplary combination is DPU together with a developer known commercially as TGMD.

To provide recording paper excellent in both thermal recording aptitude and inkjet recording aptitude, and also excellent in heat resistance and strength of a recording layer.SOLUTION: Recording paper has: a support; and a recording layer provided on the support and containing a leuco dye and an electron-accepting developer. The recording layer contains the electron-accepting developer, and the solubility of the electron-accepting developer in ethanol is 0.3 g / ml or less. The recording layer contains silica as a pigment for receiving ink, and the solid content blending amount of silica with respect to the recording layer is 20 mass% or more.SELECTED DRAWING: None

A coloured composition comprises a non-aqueous solvent, a leuco dye, a developer compound, and optionally a thickener and a surfactant. The composition is preferably an ink or paint that may be render

The present invention addresses the problem of providing: a heat-sensitive recording medium which has excellent color development sensitivity, printing travelability (particularly, resistance to print head residue adhesion), and rubbing resistance, and which has excellent print fineness during high-speed printing; and a method for producing the heat-sensitive recording medium. [Solution] A heat-sensitive recording material in which an undercoat layer, a heat-sensitive recording layer containing a colorless or light-colored electron-donating leuco dye, an electron-accepting developer and a sensitizer, and a protective layer are sequentially provided on a support, the total content (solid content) of the leuco dye, the developer, and the sensitizer in the heat-sensitive recording layer is 70.0% by weight or more, and the coating amount of the heat-sensitive recording layer is 2.5 g / m2 or less.

The invention relates to a method and to a device for producing a document body having a multi-layer laminate while producing a multi-coloured marking representing data in the interior of the laminate. The method has the steps of: - providing or producing an initial marking in or on a flat extended base substrate. In this case, the initial marking has a plurality of coloured sub-regions that each form only part of the initial marking in such a way that the colours of at least two of the sub-regions differ from one another. At least one of the colours is at least partially brought about by colorants which are in the form of a leuco dye that can be switched between a coloured state and a differently coloured state or an opaque state and an at least partially transparent state, or vice versa, by means of the energy input at the location of its action on the leuco dye. - Producing the laminate by laminating the base substrate as a first laminate layer with at least one further flat extended substrate as a respective further laminate layer in such a way that the initial marking comes to lie at least partially in the interior of the produced laminate; - effecting an energy input into the laminate in such a way that it acts in a locally selective manner in the initial marking, as a result of which the multi-coloured marking representing data is achieved at least proportionally from the initial marking on the basis of the locally selective switching of the leuco dye effected by the energy input into the initial marking.

According to the multicolor leuco dye developing ink composition and the preparation method thereof disclosed by the invention, by designing three types of leuco dyes of purple red, yellow and ink colors and optimizing the molecular structure and response mechanism of the three types of leuco dyes, multicolor synergistic developing is realized in a breakthrough manner, and the color gamut coverage of a developing system is enriched; dye combinations with structural complementarity and thermal / optical / acid-base response differentiation characteristics are selected, and a proper color developing agent and carrier system is matched, so that the dispersion stability and the color developing resolution of a multi-dye composite system are remarkably improved, and color developing cross interference is avoided; by optimizing the ratio of the dye to the color developing agent and finely adjusting the color developing trigger conditions (such as temperature, pH value and the like), the consistency control of the color developing intensity and the color tone is realized, and the reproducibility and the practicability of an ink printing pattern in different batches are remarkably improved; and a low-toxicity environment-friendly solvent or a water-based dispersion system is preferably selected as a carrier, so that the obtained ink is more suitable for environment-friendly requirements of green printing and special scenes.

The present invention addresses the problem of providing a recording paper having both excellent heat-sensitive recording adaptability and ink-jet recording adaptability, and also having excellent heat resistance and strength of a recording layer. [Solution] A recording paper which comprises a support and a recording layer that is provided on the support and contains a leuco dye and an electron-accepting developer, the recording layer containing an electron-accepting developer, the solubility of the electron-accepting developer in ethanol being 0.3 g / ml or less, the recording layer containing silica as a pigment for accepting ink, and the recording layer containing silica as a pigment for accepting ink. And the solid content blending amount of the silica relative to the recording layer is 20 mass% or more.

To suppress discoloration of a medium.SOLUTION: An image forming method includes: a transport step for conveying a medium comprising a thermal layer containing a leuco dye that reacts with a color-developing agent at a first temperature and a coating layer containing a polymer; an adhesion step of applying a liquid containing a first organic solvent and a second organic solvent to the coating layer of the medium; and a drying step of drying the medium at a second temperature lower than the first temperature. The solubility parameter of the leuco dye is 8.0 or more and 9.0 or less. The solubility parameter of the polymer is 11.0 or less. The solubility parameter of the first organic solvent is 12.0 or more and 20.0 or less. The solubility parameter of the second organic solvent is 9.0 or more and less than 12.0. The content of the first organic solvent relative to the total amount of the liquid is greater than the content of the second organic solvent relative to the total amount of the liquid. The sum of the content of the first organic solvent relative to the total amount of the liquid and the content of the second organic solvent relative to the total amount of the liquid is less than 25% by weight.SELECTED DRAWING: Figure 1

The present application belongs to the field of textile printing and dyeing processing, and discloses a method for continuous dyeing of cellulose material loose fibers with indigo. The method is as follows: cellulose material loose fibers are combed into a fiber layer by a netting machine, the fiber layer is immersed in an indigo leuco dye solution by a continuous loose fiber dyeing machine, and then is sent into a continuous oxidation reaction box to realize oxidation and color development of the indigo leuco body and complete the dyeing process. The continuous oxidation reaction box comprises a cuboid box body and a conveying system, a reaction supply system and a negative pressure filtration system in the box body. The conveying system comprises a caterpillar conveyor belt. The negative pressure filtration system comprises a negative pressure cavity and a vacuum pump, and the negative pressure cavity is used for filtering the fiber layer carried on the upper surface of the caterpillar conveyor belt. The reaction supply system comprises a temperature control unit and an oxidation medium supply unit. The present application can improve production efficiency, ensure dyeing depth and uniformity of the fibers, save dyeing water, and reduce the amount of caustic soda and sodium hydrosulfite.

To provide a non-phenolic direct thermal recording medium. [Solution] The non-phenolic direct thermal recording medium has a thermal response layer containing a leuco dye and a plurality of non-phenolic colorants, including 1,3-diphenylurea (DPU) and urea urethane (UU). This chemical enables a multi-purpose recording material that can withstand multiple different types of environmental conditions or chemicals, such as water immersion, contact with polyvinyl chloride meat packaging film, boiling water, dry and wet heat, sunlight, and contact with hand sanitizer. Due to the unique non-phenolic chemical, the coating weight of the thermal response layer of the product is 1.48 g / m². 2 It can be made extremely lightweight, weighing less than a certain amount.

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.