41 results about "Photochromic polymers" patented technology

Described is a polymerizable composition of a photochromic amount of at least one photochromic compound, at least one material having at least one carbonate group and at least one hydroxyl group, and at least one monoisocyanate containing material having at least one unsaturated group. The polymerizable composition optionally contains copolymerizable monomers. Also described are photochromic polymerizates, e.g., photochromic optical elements such as ophthalmic lenses, prepared from the polymerizable composition of the present invention.

The invention discloses a color-changing indicating error-proofing UV electronic adhesive. The color-changing indicating error-proofing UV electronic adhesive comprises following raw materials, by weight, 20 to 80 parts of a UV resin, 0.5 to 3 parts of an initiator, and 0.5 to 5 parts of a color-changing agent; the UV resin is selected from acrylic acid modified polyurethane, epoxy modified acrylate, UV silicone rubber resin, and epoxy resin of cyclic ester group; the initiator is selected from a free radical photoinitiator and a free radical thermal initiator; the color-changing agent is selected from a photochromic polymer with a thiocarbazone coordination compound structure, a photochromic high-molecular compound with an azobenzene structure, a photochromic high-molecular compound with a spirobenzopyran structure, and the like. The invention also discloses a preparation method of the color-changing indicating error-proofing UV electronic adhesive. Color of the color-changing indicating error-proofing UV electronic adhesive before solidification is stable; and difference of the color of the color-changing indicating error-proofing UV electronic adhesive before and after solidification is obvious, so that in production lines, it is possible to quickly identify that whether solidification of the color-changing indicating error-proofing UV electronic adhesive is realized, whether adhesive dispense positions are appropriate, and whether adhesive thixotropic response is induced. In addition, it is possible for direct determination of adhesive stability by associating color with adhesive solidification degree.

Describes a photochromic article, e.g., an ophthalmic photochromic article, such as an ophthalmic lens, in which the article comprises, in combination, (1) a rigid substrate, such as a transparent thermoset or thermoplastic polymeric substrate, (2) a photochromic polymeric coating superposed on, e.g., appended to, at least a portion of at least one surface of the substrate, the photochromic polymeric coating containing a photochromic amount of at least one photochromic material, e.g., an organic photochromic material such as a spirooxazine, naphthopyran and / or fulgide, (3) a coating comprising a non-polarizing cross-linked polyhydroxy polymer, e.g., a poly(vinyl alcohol), appended to said photochromic polymeric coating, and (4) a further organic polymer layer that is superposed on said coating comprising a cross-linked polyhydroxy polymer. The aforedescribed photochromic article may also have an abrasion-resistant coating, e.g., a coating comprising an organo silane, affixed to the further organic polymer coating.

A photochromic polymer comprising at least two photochromic moieties linked by a straight or branched chain polymer selected from the group consisting of poly (C2 to C4 alkylene oxide), poly [C1 to C10 alkoxy substituted (C2 to C4 alkylene oxide)] and poly [C1 to C-15 acyloxy substituted (C2 to C4 alkylene oxide)].

Photochromic monomers and methods for preparing these photochromic monomers, photochromic polymers based on these photochromic monomers and methods for preparing these photochromic polymers, as well as the use of these photochromic polymers in a polymer binder as a two-photon recording medium for an optical 3D memory and photoswitches of optical signals are disclosed. The materials exhibit thermally irreversible photochromic transformations and other properties enabling the use of the photochromic polymers in an optical two-photon read / write memory.

The present invention describes a polymerizable composition comprising a photochromic amount of at least one photochromic compound, at least one substance having at least one carbonate group and at least one hydroxyl group, and at least one A monoisocyanate comprising a substance having at least one unsaturated group. The polymerizable composition may also optionally contain copolymerizable monomers. The invention also describes a photochromic polymer, eg, a photochromic optical element, such as eyeglasses, made from the polymerizable composition of the invention.

The invention discloses a preparation method of a bispyranothiophene photochromic polymer and a color-changing anti-counterfeiting ink thereof. The bispyranothiophene photochromic polymer is prepared by the following method: the bispyranothiophene photochromic dye is acetylated The introduction of acetyl group, and then further carboxylation reaction to obtain a carboxyl-containing intermediate, the intermediate and acrylate hydroxy esters are esterified to introduce double bonds, and then further copolymerized with acrylate monomers to prepare the bispyridine Thiophene photochromic polymer. The color-changing anti-counterfeiting ink prepared based on the bispyranthiophene photochromic polymer can rapidly turn yellow under the irradiation of sunlight or ultraviolet light, and then gradually turn blue or purple, and the ink returns to colorless when the light is removed. The anti-counterfeiting performance of the prepared color-changing ink is improved, and it does not need any instrument to identify the authenticity, which can improve the universality of the anti-counterfeiting means.

Photochromic polymers containing spiro-class radical group and synthetic method thereof are provided. The polymers consist of eight photochromic polymers formed by four spiro photochromic units polymerize with trans-dichloro bis (triphenylphosphine) platinum / palladium respectively. The synthetic method is as follows: (1) benzophenone carbonyl addition reaction; (2) photochromic units gained by cyclization reaction; (3) a Carbon-carbon triple bond that is gained by sonogashira coupling reaction; (4) terminal alkyne hydrogen that is gained by hydrolysis reaction; and (5) carrying out carbonyl addition reaction of benzophenone, carrying out to obtain photochromic units, carrying out a sonogashira coupling reaction to obtain a carbon-carbon triple bond, carrying out hydrolysis reaction to obtain terminal alkyne hydrogen and carrying out polymerization reaction. The preparation method of the photochromic polymer is simple with low preparation cost and high productivity, and has a wider range of application than the prior polymers.

The invention relates to a preparation method of a responsive structural color optically variable anti-counterfeiting coating, which comprises the following steps of: preparing 100ml of a SiO2 microsphere aqueous dispersion with the mass fraction of 10-15% and the diameter of 150-220nm, adding 0.3-0.8 mg of carbon quantum dot powder and 0.1-0.4 mg of a photochromic polymer into the aqueous dispersion, magnetically and stirring at room temperature for 10-20 minutes for and sufficient mixing to obtain uniformly dispersed dispersion liquid to be sprayed; constructing a structural color pattern ona substrate by using a method of spraying nanoparticles on a mask; and then plating a metal film on the surface of the constructed structural color pattern. By adding the carbon quantum dots into thespraying dispersion liquid, the color change range of the obtained anti-counterfeiting coating is wider, and recovery is faster; and spiropyrane is positioned in a cross-linked structure of polyesteras a color-changing compound, and the unique structure can enable spiropyrane to be protected by polyester with relatively stable properties, so that the color-changing compound is prevented from being influenced by an external environment, the spectral response is more sensitive, and the color-changing effect is good.

The invention relates to the technical field of electronic glue, in particular to high-performance electronic glue. The high-performance electronic glue comprises base resin, curing agents, flame retardants, initiators, color changing agents, fillers and auxiliary agents, and specifically comprises, by weight, 30-50% of bisphenol-A epoxy resin, 8-15% of modified polythiol urea composites, 1-5% of decabromo composites, 1-5% of free radical ultraviolet initiators, 1-5% of redox photochromic polymers, 20-35% of calcium silicate ad the balance of the auxiliary agents. The high-performance electronic glue has the advantages that the color is stable before curing, and chromaticity differences are large before and after curing; the electronic glue has high temperature resistance through introduction of the flame retardants and the color changing agents, can emit strong fluorescence under the excitation of ultraviolet light, and has a certain anti-counterfeiting performance; the application field of adhesives is widened.

Describes a photochromic plastic article, e.g., an ophthalmic photochromic article, such as a lens, in which the article includes (1) a polymeric substrate, such as a thermoset or thermoplastic substrate, (2) a photochromic polymeric coating appended to at least one surface of the substrate, the photochromic polymeric coating containing a photochromic amount of at least one organic photochromic material, e.g., spirooxazine, naphthopyran and / or flugide, and (3) a radiation-cured, acrylate-based film coherently appended to the photochromic coating, the acrylate-based film being (a) resistant to removal by aqueous solutions of inorganic caustic, e.g., potassium hydroxide, (b) compatible with organo silane-containing abrasion-resistant coating, and (c) harder than said photochromic coating. Describes also the aforedescribed photochromic article having an abrasion-resistant coating affixed to the radiation-cured acrylate-based film, e.g., an abrasion-resistant coating comprising an organo silane; and a photochromic article having an antireflective coating affixed to the abrasion-resistant coating.

The present invention discloses a process for preparing a photochromic polymeric composition, characterized in that the photochromic polymeric composition is prepared by comprising (meth)acrylamide compound in the reaction mixture useful for the preparation of the photochromic polymeric composition. The present invention also relates to the thus obtained polymeric composition, photochromic articles made from said polymeric composition, and use of said polymeric composition for preparing photochromic articles. The photochromic polymeric composition according to the present invention makes the absorption peak of the photochromic dye therein become longer, thus exhibiting a desired grey with a bit bluish green or grey with a bit blue.

Described is a photochromic polymer composition including the reaction product of at least one polymerizable photochromic material and at least one other copolymerizable material having a glass transition temperature of less than 23 DEG C upon polymerization. The photochromic polymer composition is adapted to provide an increased Fade Half Life in the Photochromic Polymer Performance Test as compared to the same photochromic compound used in the reaction product, but free of polymerizable groups. Also described are photochromic articles including the photochromic polymer composition.