41 results about "Photochromic polymers" patented technology

Described is a photochromic article that includes a substrate and at least a partial coating of an at least partially cured 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. Also described are photochromic optical elements such as ophthalmic lenses, prepared from an optical element substrate coated with the photochromic polymerizable composition.

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.

A photochromic plastic article is described, e.g., an ophthalmic photochromic article, such as a lens, wherein the article comprises (1) a polymeric substrate, such as a thermosetting or thermoplastic substrate, (2) a a photochromic polymer coating comprising a photochromic amount of at least one organic photochromic material, such as spirooxazine, naphthopyran, and / or fulginic anhydride, and (3) Radiation-cured acrylate-based films adhered to photochromic coatings that are: (a) resistant to migration from aqueous inorganic caustics, such as potassium hydroxide, (b) with silicone-containing and (c) are harder than the photochromic coating. Also described are the above photochromic articles having an abrasion resistant coating, for example comprising silicone, attached to a radiation-cured acrylate-based film; and described having an abrasion resistant coating attached to Photochromic articles with antireflective coatings on abrasion resistant coatings.

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.

The invention relates to a photochromic polymeric composition comprising a polymer matrix and a photochromic compound which is an adduct comprising a photochromic moiety and at least one pendant oligomer group to provide a rate of fade of the photochromic polymeric composition which is significantly changed when compared with the corresponding composition comprising the photochromic compound without said pendent oligomer. The invention also relates to a photochromic compound which is an adduct comprising a photochromic moiety and at least one pendent oligomer.

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° 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.

The invention discloses a photosensitive microcapsule containing a photochromic material. The photosensitive microcapsule is composed of a capsule wall and a capsule core, the material of the capsulewall is a capsule wall polymer, and is formed by photopolymerization of a photopolymerizable or photocrosslinkable monomer, and the material of the capsule core is a photochromic polymeric material ora photochromic polymer. The photosensitive microcapsule containing the photochromic material has a good thermal stability, cannot be deformed or stretched under a heating condition, has good mechanical properties, can maintain the integrity and elasticity of the capsule body and protect substances in the capsule core under the impact of an external force, and is isolated from the external environment; and the photosensitive microcapsule also has a good light transmission property, so ultraviolet lights or sunlight can permeate the capsule wall smoothly and illuminate the photochromic materialof the capsule core in order to promote the photosensitive effect.

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.

Provided is a method of preparing a photochromic polymeric article including: (a) providing a fluid polymerizable composition of: at least one monomer; a first initiator for inducing polymerization of the monomer at a first temperature; and a second initiator for inducing further polymerization at a second temperature higher than the first temperature; (b) heating the polymerizable composition to at least the first temperature whereby the first initiator induces polymerization of the monomer at the first temperature to produce a polymerizate; (c) heating the polymerizate of (b) to at least the second temperature to further polymerize the polymerizate; and (d) contacting the polymerizate with an organic photochromic substance to incorporate the organic photochromic substance into the polymerizate. Photochromic articles prepared by the method are also provided.

The invention discloses a preparation method of a double-pyran thiophene photochromic polymer and color-changing anti-counterfeiting printing ink thereof. The preparation method of the double-pyran thiophene photochromic polymer includes the following steps that a double-pyran thiophene photochromic dye is subjected to acetylation to introduce acetyl, then a carboxylation reaction is further conducted, and an intermediate with carboxyl is obtained; the intermediate and hydroxyl acrylate matter are subjected to an esterification reaction to introduce double bonds, then copolymerization with acrylic monomers is further conducted, and the double-pyran thiophene photochromic polymer is prepared. The color-changing anti-counterfeiting printing ink prepared based on the double-pyran thiophene photochromic polymer can be changed to be yellow rapidly and then gradually changed to be blue or purple under illumination of sunlight or ultraviolet light, and after illumination is removed, the printing ink recovers to be colorless. The anti-counterfeiting performance of the prepared color-changing printing ink is improved, authenticity can be recognized without any instrument, and universality of anti-counterfeiting means can be improved.

The present invention provides a polymer of Formula (4) or (5) as manufactured by polymerizing alkylmethacrylate of the formula (1) or its salt with 2-metacroxyethyl triammonium chloride of Formula (2) or vinyl monomer of phosphonium salt of the formula (3), and further provides a photochromic polymer matrix manufactured by blending the said polymer as the supporter with a known photochromic organic compound. Further, the present invention enables a glass or a mirror, of which the transmittance and / or the reflectance can be adjusted, to be manufactured by coating it with the said photochromic polymer matrix in a given thickness. In the case of the glass manufactured by using the matrix of the present invention, it can be used in the field requiring adjustment the transmittance of light depending upon a weather condition, including a building or a car glass, a sunroof and the like. In the case of the mirror manufactured so, it can be applied to a rear-view mirror and a side view mirror for a vehicle and the like.

The invention discloses photochromic microspheres with excellent thermal stability and a preparation method of the photochromic microspheres. The method comprises following steps: 1), a polymer or oligomer, a photochromic compound, an antioxidant, an ultraviolet absorbent and a sensitizer are swollen in an oil-soluble solvent with low boiling point; 2), after being heated to certain temperature and stirred and dissolved into uniform oil phase, a mixture is added to an aqueous solution containing an emulsifier and a co-emulsifier, and an oil-in-water type stable emulsion with emulsion droplet particle size range being 10 nm-1000 mu m is obtained through shearing emulsification; 3), the temperature of the emulsion system is increased and kept for a period of time, the low-boiling-point solvent in emulsion droplets is completely volatilized, polymer microspheres with uniformly dispersed photochromic molecules are obtained, and dry polymer microsphere powder with the uniformly dispersed photochromic molecules can also be directly prepared from the emulsion with a spray drying process. The microspheres prepared with the method are of a homogeneous solid structure, excellent in mechanical property and good in heat stability and have great application prospect in the fields of anti-counterfeiting, plastic products, fabric clothing, chemical printing and dyeing and the like.

The present invention relates to a photochromic polymer for photo recording purposes comprising polymethacrylate, and having the following general formula: wherein R is -(CH2)o-X-C6H4-Z-C6H4-R1, wherein R1 is an electron acceptor, such as cyano, alkoxy having 1 to 8 carbon atoms, halosubstituted alkoxy having 1 to 8 carbon atoms, halogen (F, Cl), hydroxy, esters of the formula -OOC-CnH2n-1, -CO-CnH2n-1, wherein n is 1 to 8, preferably 4 to 6, but excluding nitro, Br, I, and -SO3H, X is selected from the group consisting of -O-, and -COO-, Z is selected from the group consisting of -N=N-, -CH=N-, or -CH=CH-, wherein -CH= of the -CH=N- group is bound to the main part of the structure, R2 is CmH2m+1, wherein m is an integer 4 to 7, o is a number of 7 to 12, preferably 10, and a is number providing for a photo chromic polymer.

A photochromic polymer comprising at least two photochromic moieties linked by a straight or branched chain polymer selected from the group consisting of a homo-polyester, a co-polyester, and a co-polyester-polyether.

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)].

The invention relates to photochromic monomers based on benzothiophenes and a method for preparing them, and to photochromic polymers-polyazomethines that are reversibly photocontrollable due to the introduction of photochromic fragments from the class of dihetarylethenes into their structure. The invention provides photochromic photocontrollable polymers for the creation of new information technologies.

The invention relates the polyurea photochromism polymer material with azobenzene and preparing method. The polyurea is made by polymerizing diisocyanate and diatomic alcohol and azo-m-phenylenediamine, and the polyurea has the advantages of good chromogen content, photochromism and heat stability.

The invention discloses a photochromic glass cup which is composed of an outer layer, an inner layer and a middle layer, wherein the outer layer and the inner layer are both made of inorganic glass, and the middle layer is made of a photochromic polymer coating film. The photochromic polymer coating film contains organic photochromic material diarylethene or spiropyrane. The color of the photochromic glass cup disclosed by the invention can be changed along with the change of light, so that the artistic value of the glass cup is improved, and funs are added for daily life.

The invention relates to a stable formaldehyde-free photosensitive microcapsule and a preparation method thereof. The formaldehyde-free photosensitive microcapsule is composed of a capsule wall and a capsule core, the capsule wall material is a wall material, and a polysiloxane modified polyurea-polyurethane copolymer is used. The capsule core material is a core material and uses a photochromic high polymer material or a photochromic polymer, an epoxy resin copolymer, an ultraviolet absorbent and an inert diluent. The invention further provides a preparation method of the stable formaldehyde-free photosensitive microcapsule, the preparation method is simple and easy to operate, the prepared stable formaldehyde-free photosensitive microcapsule is good in light transmission, good in color development effect and excellent in mechanical property, the integrity of a microcapsule body can be guaranteed under the impact of external force, meanwhile, the stable formaldehyde-free photosensitive microcapsule also has good thermal stability, deformation, adhesion and leakage are avoided in a high-temperature environment, and good color changing performance is still achieved after long-time ultraviolet irradiation and repeated color changing.

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 relates to an intraocular lens comprising at least one pharmaceutically-acceptable photochromic polymer that enables all or part of the intraocular lens to change colour reversibly when exposed to light.

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.

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.