325 results about "Leuco dye" patented technology

A sensor that is sensitive to the presence of aqueous-based fluids is described. The sensor has a wetness indicating material immobilized or printed on a substrate. The indicating material contains at least one electron-donating leuco dye and one electron deficient receptor, and exhibits a visual signal (e.g., vivid or strong color intensity) in a dry state, which fades or disappears when in contact with a water-containing liquid. An absorbent article incorporating such a sensor to communicate to a user that the article has been exposed to water-containing fluids is also described.

Synthesis of a chemical compound having the formula A-B-C that may serve for applications such as drug delivery where A is a chemiluminescent, moiety, B is a photochromic moiety, and C is a biologically active moiety where A-B-C may serve as a prodrug. Novel synthetic methods of the present invention to form the prodrug comprised the steps of (1) forming a benzophenone, (2) forming a diaryl ethylene, (3) attaching a phthalimide moiety to at least one of the aryl groups of the ethylene to form a phthalimide-ethylene conjugate, (4) condensing two ethylene-phthalimide conjugates to form a phthalimide-pentadiene conjugate, (5) converting the phthalimide to the phthalhydrazide by reaction with hydrazine to form a carrier compound according to the present invention, and (6) reacting the carrier compound with an nucleophilic moiety of the drug to form the corresponding prodrug. Alternatively the carrier can be prepared by using the halo-substituted diaryl ethylene to make the corresponding cationic leuco dye-like compound with known methods. The cationic compound then is protected by reacting with a nucleophile and coupled with the aminophathalimide by palladium-catalyzed amination to form the protected phthalimide-pentadiene conjugate. The latter is refluxed with hydrazine to convert its phthalimide to the phthalhydrazide and acidified to give the carrier. An additional aspect of the present invention relates to the use of these compounds as antiviral agents for the treatment of viral infections such as HIV and as anticancer agents for the treatment of cancers such as bowel, lung, and breast cancer.

Coating compositions containing resins with dispersed nanoparticle precursors and methods for using said coatings as visual indicators of thermal and impact damage. The nanoparticle precursor/resin system reduces the nanoparticle precursor to its nanoparticle state when subjected to heat and/or physically impacted. The nanoparticles formed impart a color upon the coating at the point of exposure due to surface plasmon resonance. Microencapsulated leuco dyes are utilized to impart color when the coating is struck. The dye within the microcapsule is released as the microcapsule wall bursts or melts. Solubillizing agents can be utilized to improve the solubility of the nanoparticle precursor in the resin.

A thermal sensitive recording medium which has a feature to change the color of recorded pattern slowly and spontaneously after development, and the recorded pattern which has several days passed can be easily distinguished from that of just after development. Said thermal sensitive recording medium contains 4-hydroxybenzoic acid ester represented by general formula (I) as a color developer and uses triphenylmethane-based leuco dye and reddish color developing leuco dye whose maximum absorption wave length is 450 DIFFERENCE 560 nm as a dye precursor. In this formula, R represents unsubstituted or substituted lower alkyl group of carbon number 1-7 or benzyl group.

The invention describes a color-developing composition that contains at least three major components: (1) a leuco dye or a combination of leuco dyes, (2) an color-developer or a combination of color-developers that can form colored complexes with the leuco dyes, and (3) a desensitizer to temporarily remove the effect of the developer so the leuco dye appears in its colorless form. An optional binder may be included so that the composition may be applied to a substrate as an ink. The ink composition may be applied to synthetic polymeric substrates and other substrates that are incorporated into absorbent articles or personal care products.

A color-appearing ink composition includes a surfactant blend of at least two non-ionic surfactants having hydrophilic-lipophilic balance values greater than 10, or a non-ionic surfactant having a hydrophilic-lipophilic balance value greater than 10 and a charged surfactant. The composition includes one or more water-insoluble leuco dyes, a developer and a desensitizer. The composition may be applied to a substrate to form a sensor.

Compositions and methods for production of color images having increased light stability and reduced browning are described. The color forming composition can include a leuco dye, an infrared absorber, and at least one of a stabilizer and an anti-fade agent. The color forming compositions can be stabilized such that less than about a 30% decrease in optical density occurs over a three year period. The stabilizers can include chroman, thiolane-nickel complexes, spiroindanes, while suitable anti-fade agents can include vitamin E, vitamin E analogs, astaxanthin, chroman, ascorbic acid, carotene, and mixtures thereof. The color forming compositions are ambient light stable and are useful in forming images on a wide variety of substrates such as optical disks.

The present invention relates to IR-sensitive compositions containing an initator system comprising:

• • (a) at least one compound capable of absorbing IR radiation selected from triarylamine dyes, thiazolium dyes, indolium dyes, oxazolium dyes, cyanine dyes, polyaniline dyes, polypyrrole dyes, polythiophene dyes and phthalocyanine pigments
  • (b) at least one compound capable of producing radicals selected from polyhaloalkyl-substituted compounds
  • (c) at least one polycarboxylic acid represented by the following formula I

wherein Y is selected from the group consisting of O, S and NR⁷, each of R⁴, R⁵ and R⁶ is independently selected from the group consisting of hydrogen, C₁-C₄ alkyl, aryl which is optionally substituted, —COOH and NR⁸CH₂COOH, R⁷ is selected from the group consisting of hydrogen, C₁-C₆ alkyl, —CH₂CH₂OH, and C₁-C₅ alkyl substituted with -COOH, R⁸ is selected from the group consisting of —CH₂COOH, —CH₂OH and —(CH₂)₂N(CH₂COOH)₂ and r is 0, 1, 2 or 3 with the proviso that at least one of R⁴, R⁵, R6, R⁷ and R⁸ comprises a —COOH group or salts thereof, and

(d) at least one leuco dye, wherein the following inequation is met:

with ox_a=oxidation potential of component (a) in eV red_b=reduction potential of component (b) in eV

These compositions are inter alia extraordinarily suitable for the manufacture of printing plates.

Disclosed is high temperature resistant thermosensitive paper, a precoating is applied on the original thermosensitive paper; hollow ball resin is added in the precoating paint, a chromogenic layer is applied on the paper with the precoating; and a protective layer is applied on the paper with the chromogenic layer. The chromogenic layer comprises leuco dye, oxidant, sensitizer, lubricant, adhesive, filling calcining soil and anti-aging preparation. The protective layer is acrylamide and epichlorohydrin. In the novel thermosensitive paper process, color development occurs at 180 DEG C, and the bottom color occurs at 150 DEG C so as to solve the problem that common thermosensitive paper does not resist high temperature.

Disclosed is an electrochromic display device comprising: a first substrate; a first electrode; a second substrate; a second electrode; and an electrochromic composition layer, wherein the device is of a passive matrix drive where the device performs a display by an energization between the electrodes, and performs a erasion of the display, wherein the first electrode comprises electrodes, the second electrode comprises a plurality of transparent display electrodes, a pixel is formed where the electrodes are in a grade separated crossing, at least a surface of the electrodes is respectively oxidized, the electrochromic composition layer comprising (i) insulative partition walls and (ii) an electrochromic composition including a supporting electrolyte, a polar solvent, and a leuco dye, and wherein the device displays a selected pixel by applying a voltage of a first potential difference, and applies the voltage of a second potential difference so as not to cause any energization.

Articles and methods for using the articles are described. In one aspect, a chemical indicator test strip is provided, comprising: a substrate; and a coating comprising a leuco dye complex and surfactant on the substrate, the coating being insoluble in water and reactive with antimicrobial fatty acid monoester, the coating derived from a solution of leuco dye, developing agent and surfactant. In another aspect, a method of using a chemical indicator test strip is provided, the method comprising:

• • (a) Exposing a chemical indicator test strip to antimicrobial fatty acid monoester, the chemical indicator test strip, comprising:
    • A substrate; and
    • A coating comprising a leuco dye complex and surfactant on the substrate, the coating being insoluble in water and reactive with antimicrobial fatty acid monoester, the coating derived from a solution of leuco dye, developing agent and surfactant;
  • (b) Measuring a color change on the chemical indicator test strip following the exposing step;
  • (c) Correlating the color change with the concentration of antimicrobial fatty acid monoester in the sample.

This invention relates to a photosensitive element for use as a flexographic printing plate and a process for preparing the plate from the element. The photosensitive element has at least one photopolymerizable elastomeric layer that comprises a binder, a monomer, a photoinitiator, an onium salt, and a leuco dye. Upon exposure to actinic radiation, the onium salt and leuco dye react resulting in a change of color in polymerized portions of the photopolymerizable layer. The color change provides enhanced image color contrast in the photosensitive element.

Compositions and methods for production of color images using leuco dye-containing color forming compositions are described. The color forming composition can include a color forming leuco dye, a metal salt activator, a suppression agent configured for inhibiting the activity of the metal salt activator until application of energy in the form of heat or light, and an initiator precursor. The initiator precursor is capable of liberating scavenger species which reduce the inhibiting action of the suppression agent. The color forming compositions can be a single phase mixture of a leuco dye, metal salt activator, suppression agent, and initiator precursor which are stable under ambient conditions and form a colored composition upon application of energy.

Disclosed herein is a temperature monitoring system including a circuit board and a thermochromic coating covering at least a portion of the circuit board, wherein the thermochromic coating is capable of indicating a temperature gradient on the circuit board. The thermochromic coating may comprise a color forming leuco dye, an activator, and optionally a deprotecting agent.