79results about How to "High photochemical stability" patented technology

Coupling of anodic electrochromic compounds by a covalent bond or a bridge link which provides for electronic communication between the coupled electrochromic compounds results in coupled electrochromic compounds which exhibit greater stability as well as electrochromic activity that differs from the monomeric electrochromic compounds. Extension of the absorption spectrum into the near-infrared region of the spectrum is frequently observed. The coupled electrochromic compounds are highly suitable for use in electrochromic media used to produce electrochromic devices.

UV-photostable, topically applicable cosmetic/dermatological compositions contain at least one dibenzoylmethane UV-sunscreen compound and at least one photostabilizing silicon-containing s-triazine compound substituted with two aminobenzoate or aminobenzamide groups.

Photostable cosmetic compositions contain, formulated into a cosmetically acceptable vehicle, at least one UV-screening system that includes:

• • (a) at least one dibenzoylmethane compound, and
  • (b) at least one 2-pyrrolidinone-4-carboxy ester compound having the following formula (I):

in which:

• • R¹ is a linear or branched C₁-C₂₀ alkyl radical, and
  • R² is a linear or branched C₁-C₂₀ alkyl radical which optionally includes a C₅-C₆ ring member, the phenyl radical, the benzyl radical or the phenethyl radical.

Sterically stabilized second-order nonlinear optical chromophores and devices incorporating the same are embodied in a variety of chromophore materials. An exemplary preferred chromophore includes an electron donor group, an electron acceptor group and a ring-locked bridge structure therebetween, with the bridge structure being directly connected to the electron donor via a single bond. Another exemplary preferred chromophore includes an electron donor group, an electron acceptor group and a ring-locked bridge structure between the electron donor group and the electron acceptor group, with two free double bonds, one located between the donor and the bridge and the other located between the (fused) ring bridge and the acceptor. Another exemplary preferred chromophore includes an electron donor group, an electron acceptor group, and a bridge structure therebetween, with the chromophores having no carbon-carbon double bond between the donor and the (fused) ring bridge. In this class, there is only one unlocked carbon-carbon double bond between the (fused) ring bridge and the acceptor. Another exemplary preferred chromophore includes an electron donor group, an electron acceptor group, and a ring-locked bridge structure therebetween, with a built-in electron-withdrawing cyano group on the last ring of the (fused) bridge. Another exemplary preferred chromophore includes any electron donor group, an electron acceptor group including a linear conjugated triene bearing four cyano groups, and any bridge structure therebetween.

Cosmetic/sunscreen compositions contain a combination of at least one dibenzoylmethane sunscreen compound and a photostabilizing amount of at least one dithiolane compound of formula (I) below:

Photostable UV-photoprotecting cosmetic sunscreen compositions contain (a) an effective UV-photoprotecting amount of at least one dibenzoylmethane compound sunscreen, (b) an effective radiation-photostablizing amount of at least one pyrrolidinone compound having the formula (I) below:

and, advantageously, at least one liquid fatty phase and at least one lipophilic active sunscreen agent of low solubility, formulated into (c) a cosmetically acceptable support therefor.

Compositions comprising nanosized objects (i.e., nanoparticles) in which at least one observable marker, such as a radioisotope or fluorophore, is incorporated within the nanosized object. The nanosized objects include, for example, metal or semi-metal oxide (e.g., silica), quantum dot, noble metal, magnetic metal oxide, organic polymer, metal salt, and core-shell nanoparticles, wherein the label is incorporated within the nanoparticle or selectively in a metal oxide shell of a core-shell nanoparticle. Methods of preparing the volume-labeled nanoparticles are also described.

Topically applicable, improvedly photostabilized, photoprotective cosmetic/dermatological compositions contain (i) an effective UV-screening amount of at least one dibenzoylmethane sunscreen and an effective photostabilizing amount of (ii) at least one bis-resorcinyl triazine compound and (iii) at least one compound accepting the excited triplet level energy of said at least one dibenzoylmethane sunscreen, notably at least one 4-hydroxybenzylidenemalonate compound, 4-hydroxycinnamate compound, fluorene compound, piperidinol salt, or mixture thereof, formulated into (iv) a topically applicable, cosmetically/dermatologically acceptable support therefor.

The invention provides application of Mn-doped core-shell structure zinc sulfide quantum dot ZnS:Mn/Zn taken as fluorescent security agent, as well as waterborne fluorescent falsification-resistant ink and a preparation method of the waterborne fluorescent falsification-resistant ink. The waterborne fluorescent falsification-resistant ink comprises the following raw materials in percentage by weight: 15-20 percent of n-butanol, 5-10 percent of ZnS:Mn/ZnS quantum dot, 0.5-1 percent of sodium dodecyl benzene sulfonate, 0.1-0.5 percent of foam killer SP-23, 0.1-0.5 percent of polyacrylate sodium, and water in balancing amount. The waterborne fluorescent falsification-resistant ink is colourless under the natural condition while can give out a blood orange light under the radiation of ultraviolet light. In addition, the main components of the waterborne fluorescent falsification-resistant ink comprise alcohol and the waterborne quantum dot, ink additive and less additives, water is the solvent, and the pollution is less, so that the environmental-friendly fluorescent falsification-resistant ink caters for the development trend of fluorescent falsification-resistant ink in the future, and has a broad application prospect.

Photostable sunscreen compositions containing at least one cinnamic acid ester UV-B filter and at least one particular s-triazine compound have improved effectiveness with respect to UV-B radiation.

Photostable, topically applicable cosmetic/dermatological compositions contain at least one dibenzoylmethane compound UV-A sunscreen and at least one merocyanine sulfone compound.

Photostable, topically applicable cosmetic/dermatological compositions contain at least one dibenzoylmethane sunscreen compound and at least one photostabilizing siloxane-containing arylalkyl amide compound of formula (I) below:

Cadmium sulfide semi-conductor nanocrystalline wet-soild phase reaction preparation method comprises the following steps : mixing thioglycolic acid with cadmium chloride according to mol raito 1.8-2.2:1, grinding, adding deionized water to scouring off excess thioglycollic acid, filtering, rinsing filter cake with deionized water, mixing filter cake and sodium sulfide according to 1-3.5:2 mol ratio, grinding, obtaining light yellow solid, dissolving the above-mentioned light yellow solid in water, adding into acetone or ether, depositing the CdS sol, filtering, rinsing, drying, obtaining nano CdS crystal. Reaction condition of the inventive is temperate, inventive process is simple, yield is high, grain size of prepared granule is uniform, not congregate. The invention has good repeatability. compared with traditional bioluminescence probe(organic dye), excitation spectrum of nano crystal is broad, and continuously distributed, while emission spectrum is symmetrically distributed and narrow, color is adjustable, which has a good application prospect in bioluminescence probe.