53results about "Spiro-condensed pyran compound compositions" patented technology

Photochromic diaryl-2H-naphthopyran structures, which dye photochromically well at room temperature, lighten up quickly when incorporated into ophthalmic lenses, possess longevity, and due to their spacial structures, have a reduced tendency of the molecules to migrate in plastics.

An reimageable medium composed of: a substrate; and a photochromic material, wherein the medium is capable of exhibiting a color contrast and an absence of the color contrast, wherein the medium has a characteristic that when the medium exhibits the absence of the color contrast and is then exposed to an imaging light corresponding to a predetermined image to result in an exposed region and a non-exposed region, the color contrast is present between the exposed region and the non-exposed region to form a temporary image corresponding to the predetermined image that is visible for a visible time, wherein the medium has a characteristic that when the temporary image is exposed to an indoor ambient condition for an image erasing time, the color contrast changes to the absence of the color contrast to erase the temporary image in all of the following: (i) when the indoor ambient condition includes darkness at ambient temperature, (ii) when the indoor ambient condition includes indoor ambient light at ambient temperature, and (iii) when the indoor ambient condition includes both the darkness at ambient temperature and the indoor ambient light at ambient temperature, and wherein the medium is capable of undergoing multiple cycles of temporary image formation and temporary image erasure.

A reimageable medium for receiving an imaging light having a predetermined wavelength scope, the medium composed of: a substrate; a photochromic material capable of reversibly converting among a number of different forms, wherein one form has an absorption spectrum that overlaps with the predetermined wavelength scope; and a light absorbing material exhibiting a light absorption band with an absorption peak, wherein the light absorption band overlaps with the absorption spectrum of the one form.

A reimageable medium for receiving an imaging light having a predetermined wavelength scope, the medium composed of: a substrate; a photochromic material capable of reversibly converting among a number of different forms, wherein one form has an absorption spectrum that overlaps with the predetermined wavelength scope; and a light absorbing material exhibiting a light absorption band with an absorption peak, wherein the light absorption band overlaps with the absorption spectrum of the one form.

Various non-limiting embodiments of the present disclosure relate to photochromic materials comprising a reactive substituent. For example, the present disclosure contemplates photochromic materials, such as photochromic naphthopyrans and indeno-fused naphthopyrans having a reactive substituent comprising a reactive moiety linked to the photochromic naphthopyran by one or more linking groups. In certain non-limiting embodiments, the reactive moiety comprises a polymerizable moiety. In other non-limiting embodiments, the reactive moiety comprises a nucleophilic moiety or an electrophilic moiety. Other non-limiting embodiments of the present disclosure relate to photochromic articles, compositions, and methods of making the photochromic articles, wherein the photochromic articles and compositions comprise the photochromic naphthopyrans described herein.

Disclosed are a primer composition having photochromic property and impact resistance for coating transparent materials and a photochromic transparent material having a primer layer formed by coating and curing the primer composition. The primer composition for coating transparent materials comprises: a) 5-90 parts by weight of a polyurethane containing Brønsted salt; b) 5-50 parts by weight of a polyepoxy resin; and c) 140 parts by weight of a photochromic dye, based on 100 parts by weight of the total primer composition. The photochromic transparent material having a primer layer formed by coating and curing the primer composition shows excellent photochromic property and impact resistance.

The present invention relates to a photochromic spirobenzopyran compound of the formula (1) and its derivatives, a spirobenzopyran group having unsaturated terminal groups, a polymer prepared therefrom, a method for the production thereof, a composition comprising said spirobenzopyran or said spirobenzopyran group-containing polymer and a photochromic switch film using the same: wherein the substituents are defined in the specification. According to the present invention, a polymer which possesses excellent mechanical properties and rapid photochromic switch properties at room temperature and a photochromic thin film for switch elements are produced. They are useful in applications such as photo switches, photochromic filters, light stabilizers, paper money or cards for preventing counterfeit forgeries, display elements, optical recording media or photo integrated elements.

Photochromic diaryl-2H-naphthopyran structures, which dye photochromically well at room temperature, lighten up quickly when incorporated into ophthalmic lenses, possess longevity, and due to their special structure, have a reduced tendency of the molecules to migrate in plastics.

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.

A thermochromic reimageable recording medium comprises a substrate and thermochromic composition comprising a photochromic material, a transition metal salt and a binder. The thermochromic composition changes color from a colorless state to a colored state upon application of heat. The thermochromic recording medium may be used to display a viewable image by applying heat to selected areas of the medium to form a desired image. The colored state is changeable or erasable back to the colorless state by exposure to visible light.

Various non-limiting embodiments disclosed herein relate to photochromic materials having extended pi-conjugated systems, such as an indeno-fused naphthopyran, which comprises a group that extends the pi-conjugated system of the indeno-fused naphthopyran bonded at the 11-position thereof. Further, the photochromic materials according to certain non-limiting embodiments disclosed herein may display hyperchromic absorption of electromagnetic radiation as compared to conventional photochromic materials and / or may have a closed-form absorption spectrum that is bathochromically shifted as compared to conventional photochromic materials. Other non-limiting embodiments relate to photochromic compositions and photochromic articles, such as optical elements, made using the disclosed photochromic materials, and methods of making the same.

Disclosed is a coating composition for a plastic photochromic lens and the plastic photochromic lens coated with the same. The coating composition includes a spiropyran photovariable color compound and / or spirooxazine photovariable color compound dissolved in toluene, and an acryl based binder. The plastic photochromic lens coated with the coating composition has advantages of short variable time, and good adhesion of the coating composition to the plastic lens and UV prevention effect without an undesirable haze phenomenon.

The present invention provides a photochromic material which is an indeno-fused naphthopyran having a pi-conjugation extending group bonded to the 11-position of the indeno-fused naphthopyran, the pi-conjugation extending group having at least one pendent halo-substituted group bonded thereto. The pi-conjugation extending group extends the pi-conjugation system of said indeno-fused naphthopyran. The 13-position of the indeno-fused naphthopyran is substantially free of spiro-substituents. The invention further provides photochromic materials of specified structure, photochromic compositions, photochromic articles and optical elements that include the photochromic material.

The present invention provides a photochromic material which is an indeno-fused naphthopyran having a pi-conjugation extending group bonded to the 11-position of the indeno-fused naphthopyran, the pi-conjugation extending group having at least one pendent halo-substituted group bonded thereto. The pi-conjugation extending group extends the pi-conjugation system of said indeno-fused naphthopyran. The 13-position of the indeno-fused naphthopyran is substantially free of spiro-substituents. The invention further provides photochromic materials of specified structure, photochromic compositions, photochromic articles and optical elements that include the photochromic material.

The present invention provides a reversible piezochromic system that gives high contrast images upon an application of pressure to the system. The system has a short color-reversal time and can be prepared inexpensively by admixing a suitable electron donating compound and a suitable electron accepting compound. The reversible piezochromic systems of the present invention are useful for preparing a printing ink that can be used to print, for example, banknotes, to prevent forgeries.

The present invention relates to a compound comprising a photochromic moiety and at least one substituent comprising a polymer chain having a carbon backbone and a plurality of functional moieties appended to the carbon backbone.

A chromene compound represented by the following formula (1),wherein R1, R2, R3 and R4 are, respectively, hydrogen atoms, alkyl groups, aryl groups, or the like groups under a condition that at least two of R1 to R4 are not hydrogen atoms,R5, R6, R7 and R8 are, respectively, alkyl groups, aryl groups or the like groups,m and n are, respectively, integers of 0 to 4, andx and y are, respectively, integers of 0 to 5.The compound has a basic structure in which a 6-membered ring is condensed in a form of shearing a carbon atom at the fifth position and a carbon atom at the sixth position of a 2H-benzo[h]chromene skeleton. Owing to this molecular structure, the chromene compound of the invention develops a yellow color or a neutral tint by itself, exhibits favorable photochromic properties, and does not exhibit deteriorated photochromic properties even when it is used in combination with a photopolymerization initiator.

The present invention relates to novel cross-linkable or crosslinked photochromic compositions, articles made from or coated with the compositions and method of making the compositions. The compositions contain (i) at least one segmented or non-segmented polyurethane-type or polyurethane-urea-type linear polymer having at least one non-terminal moiety that comprises at least one unsaturated group; and (ii) an effective amount of at least one photochromic organic compound, advantageously selected from spiroxazines, chromenes, spiropyrans fulgides and fulgimides.

A mechanochromic coating composition is disclosed comprising a polymeric network incorporating a plurality of ring-opening mechanophores each bound at two positions thereof within said polymeric network.

The present invention provides a reversible piezochromic system that gives high contrast images upon an application of pressure to the system. The system has a short color-reversal time and can be prepared inexpensively by admixing a suitable electron donating compound and a suitable electron accepting compound. The reversible piezochromic systems of the present invention are useful for preparing a printing ink that can be used to print, for example, banknotes, to prevent forgeries.

A light reactive medium comprises an imaging layer reactive to radiation of a first frequency to exhibit a visible change, and a further layer above the imaging layer, the further layer being changeable from being substantially transparent to said first frequency to being substantially opaque to said first frequency, in response to electromagnetic radiation of a second frequency substantially different from the first frequency, the at least one other layer being at least partially transparent to visible light reflected from the imaging layer while being opaque to said first frequency. Also disclosed is a lenticular imaging method in which a lenticular layer is provided over the imaging layer, and images to be viewed from different directions are written using light incident at different directions. Also disclosed is a phosphorescent display that may be used to display lenticular images.

An image-forming medium and methods for forming and imaging the medium are provided. The disclosed medium can be strongly colored under room illumination (or deliberate UV) and can be selectively discolored at an appropriate light wavelength to form an image. In one embodiment, the image-forming medium can include a substrate (e.g., a sheet of paper), a photochromic material incorporated with the substrate, and a photo-absorbing material incorporated with the photochromic material. Exemplary methods for using the image-forming medium to make a transient image can include first forming the image-forming medium by applying a coating solution containing photochromic material to the substrate or paper. The image-forming medium can have a medium color and can then be selectively exposed to a radiation through a mask to convert the photochromic material from a colored form to a colorless form and thus to form an image having a color contrast with its background.

The present invention relates to photochromic articles that include a substrate and at least one photochromic material that is adapted to change from an unactivated form to an activated form by exposure to radiation substantially in the wavelength range from 380 to 450 nanometers when measured over a range of from 380 to 700 nanometers. The photochromic article is also adapted to retain at least 12 percent of the delta OD measured in the Outdoor Test when tested in the Behind the Windshield Test. The photochromic material can be selected from certain compounds including, for example, fluoranthenoxazines, naphthopyrans, phenanthropyrans, fluoranthenopyrans, and indenonaphthopyrans, which each have bonded thereto at least one chiral or achiral lengthening group that provides the photochromic compound with dichroic properties. The present invention also relates to methods of forming a photochromic article.

A chromene compound typically represented by the following formula,When placed in a state of developing color, the chromene compound exhibits absorption bands in two wavelength regions of 440 to 500 nm and 570 to 630 nm. A difference in the absorption intensity between the two absorption bands is small, and an intensity ratio in the color density in the two absorption bands is usually in a range of from 0.7 to 1.2. A color tone of a neutral tint such as grey or brown is obtained by using a single compound.