41 results about "Depigmenting agents" patented technology

This invention relates to methods and compositions for bringing about changes in skin pigmentation. More particularly, this invention relates to compounds which affect melanogenesis and can be used as depigmenting agents or as agents for darkening skin utilizing the PAR-2 pathway.

The present invention provides methods and compositions for reducing pigmentation.

A method for preparing industrial-grade phosphoric acid with wet-process phosphoric acid. The process steps include pretreatment, desulfurization, filtration and separation, extraction, deep desulfurization, washing, back-extraction and concentration; Fluorine agent and decolorizing agent, desulfurization, defluorination and decolorization are carried out in one process, the reaction temperature is 60-80°C, and the reaction time is 2-4 hours. The method of preparing food-grade phosphoric acid with wet-process phosphoric acid is to add a deep defluorination process on the basis of the above-mentioned process steps for preparing industrial-grade phosphoric acid, and the deep defluorination process is placed after the stripping process. This method simplifies the process, reduces energy consumption and saves costs.

The present invention provides methods and compositions for reducing pigmentation.

The use of DHEA or at least one of its biological precursors or of its metabolic derivatives in or for the manufacture of a composition for topical application to the skin, as a pigmentation regulator for the skin or its superficial growths, especially as a depigmenting and / or bleaching agent for the skin, in particular in the treatment of pigmentation marks, and as a pro-pigmenting agent for superficial body growths.

The present invention relates to a compound of formula (I), a process for preparing this compound, a cosmetic or pharmaceutical composition containing this compound, and its use as a depigmenting agent, whitening agent, bleaching agent or whitening agent Uses, and use thereof for the treatment of pigmentation disorders, especially by topical application on the skin.

The invention belongs to the preparation field of epoxy curing agents and discloses a method of preparing C21 dicarboxylates polyamide epoxy curing agent with methyl eleostearate as follows: the first step: 100 molar portions of methyl eleostearate, 20.6-30.9 molar portions of acrylic acid, and inhibitor accounting for 0.5% to 1.5% mass of the acrylic acid are processed with addition reaction at 160 to 180 DEG C for 2 to 3 hours; then the non-reactant is removed through vacuum distillation and the reactant is decolorized through depigmenting agent so as to obtain C21 dicarboxylic acid monomethyl ester. The second step: 1 mol of C21 dicarboxylic acid monomethyl ester obtained from the first step is added drop by drop into 1.5-2 mol of polyamine which is of 140 DEG C within 0.5 hour, then the mixture liquid is processed with amidation at 170 to 200 DEG C for 3 to 6 hours; later, water and free amine are removed through vacuum distillation, so the C21 dicarboxylates polyamide epoxy curing agent is obtained. The methyl eleostearate of the invention has an 85% yield, high reactivity and low energy consumption needed in the reactions; the prepared C21 dicarboxylates polyamide epoxy curing agent and the epoxy solid products have high strength and modulus and good heat-resistant performance.

The invention discloses a nonapeptide-1 derivative and its synthesis method and application, belonging to the technical field of cosmetic peptides, using nonapeptide-1, asiatic acid or hydroxyasiatic acid as raw materials, nonapeptide-1 and asiatic acid The molar ratio of nonapeptide-1 and madecassic acid is 1: 2.0-4.0, or the molar ratio of nonapeptide-1 and madecassic acid is 1: 2.0-4.0, with HOBt / DCC or DMAP / DCC as condensing agent, carry out condensation reaction, obtain nine Peptide-1 derivatives. The nonapeptide-1 derivative of the present invention has inhibitory tyrosinase activity, antioxidant activity, anti-photoaging activity, anti-sensitivity activity, and good transdermal permeability, and can be used to prepare skin depigmentation agents, whitening agents, and light spots Agents, anti-aging agents, anti-sensitivity agents.