230 results about "Free radicals scavenger" patented technology

An electrophoretic medium comprises a liquid and at least one particle disposed within the liquid and capable of moving therethrough on application of an electric field to the medium. The medium further comprises a free radical scavenger selected from the group consisting of (a) stable free radicals; and (b) polymeric free radical scavengers comprising a plurality of free radical scavenging groups attached to a polymeric chain. The medium is desirably encapsulated.

PCT No. PCT / EP96 / 05160 Sec. 371 Date Jul. 21, 1998 Sec. 102(e) Date Jul. 21, 1998 PCT Filed Nov. 22, 1995 PCT Pub. No. WO97 / 22672 PCT Pub. Date Jun. 26, 1997To offer thermosetting paint compositions resistant to yellowing to brass, which give paint films of excellent resistance to yellowing due to brass, low-temperature curability, weather resistance, resistance to yellowing after stoving, acid resistance, scratch resistance, solvent resistance, adhesion and appearance. Thermosetting paint compositions, which are thermosetting paint compositions which are resistant to yellowing due to brass, characterized in that the paint-film-forming components include (A) a compound which has per molecule at least 2 functional groups which can react with an isocyanate group, at 49.6-90 wt %, (B) a blocked isocyanate which has par molecule at least 2 isocyanate groups blocked by an azole blocking agent, at 9.6-50 wt %, (C) an ultraviolet absorber and / or free radical scavenger, at 0.2-5 wt %, (D) an organotin compound at 0.1-3 wt %, and (E) an amino resin at 0.1-30 wt %.

A method and apparatus for recycling and recovering potentially explosive solvents includes providing a contaminated solvent to a distillation tank, vaporizing the solvent in the distillation tank, thereby producing solvent vapor, condensing the solvent vapor, and adding a free radical scavenger substance to the distillation tank during the heating step. The vapor is then condensed and collected in a clean solvent tank where additional free radical scavenger substance is added to the clean solvent tank. Preferably, contaminated solvent is introduced into the solvent recovery system by providing contaminated solvent into contaminated solvent tank which is connected to the distillation tank, and an oxygen displacer substance is provided to the contaminated solvent tank and the clean solvent tank so as to minimize the amount of free oxygen in the tanks.

The invention provides a preparation method for a methyl methacrylate polymer with high thermal stability, and continuous bulk polymerization or solution polymerization is adopted in the invention. According to the invention, no free radical scavengers or cross-linking agents need to be added in the preparation method; instead, unstable structures like a head-to-head structure and a terminal unsaturated double bond in the molecular structure of the methyl methacrylate polymer is gradually eliminated by controlling polymerization temperature, devolatilization temperature, polymerization time and devolatilization time in the continuous polymerization process of methyl methacrylate, thereby achieving the goal of improving thermal stability of PMMA. Preparing a PMMA resin with the method not only enables the PMMA resin to have excellent thermal degradation resistance, but also enables other inherent excellent properties of the PMMA resin to be guaranteed. The methyl methacrylate polymer prepared by the method in the invention has high thermal degradation resistance, with a starting thermal degradation temperature being higher than 360 DEG C. With utilization of the method, light transmittance of the PMMA resin is guaranteed to be 93%, and molecular weight distribution of the PMMA resin is guaranteed to be less than 1.8, while thermal stability of the PMMA resin is improved.

Described herein is a composition that comprises a cryoprotectant; a membrane protectant that stabilizes or assists in stabilization of membranes of sperm; and a free radical scavenger (e.g., a reducing agent, an antioxidant).

An object of the present invention is to provide a composition for the oral cavity which protects gingiva and oral mucosas against a bleaching treatment with a tooth bleaching agent. The present invention provides a composition for the oral cavity containing a free radical scavenger.

The present invention relates to hair colouring and hair bleaching compositions comprising a source of carbonate ions, at least one oxidizing agent and a specified gel network thickener system wherein said composition is free of a source of radical scavengers. The compositions surprisingly provide improved hair colourant and bleaching compositions which deliver improved lift, lightening and colour delivery whilst minimizing damage which are easy to manufacture and have long shelf life stability.

The present invention discloses a detoxification agent for vomitoxin in a biodegradable feed and a preparation technology thereof. The detoxification agent comprises the following raw materials: 40-60 parts of bentonite, 20 parts of immune polysaccharides, 10-20 parts of a free radical scavenger, and 20-30 parts of a vomitoxin degrading bacillus subtilis powder agent. A preparation method of the bacillus subtilis powder agent comprises the following steps: 1) original strains are subjected to a seed liquid activation and a mother culture is conducted in a primary fermentation tank loaded with a culture medium; 2) a mother culture liquid is subjected to an amplification culture in a second fermentation tank loaded with a LB culture medium; and 3) the bacterium body and the fermentation liquid are separated, the separated fermentation liquid is concentrated, and the concentrated fermentation liquid is dried to prepare the vomitoxin degrading bacillus subtilis powder agent; and the powder agent is combined with the two raw material mixtures in the above parts by weight to obtain the finished products. The detoxification agent has the degradation rate of the vomitoxin at 95% or more, is high in degradation efficiency, and avoids the defects of adsorbents. Besides, the immune polysaccharides and free radical scavenging components are added in the products, so that the detoxification agent can play the functions of protecting liver and improving the immunity of body, and is obvious in effects.

An ion-conducting membrane structure comprising (i) an ion-conducting membrane wherein said membrane has a first face and a second face, (ii) a first hydrogen peroxide decomposition catalyst and (iii) a first radical scavenger, wherein the first hydrogen peroxide decomposition catalyst is in a first layer on the first face of the ion-conducting membrane in an amount from 0.01 to 15[mu]g / cm2 or the first hydrogen peroxide decomposition catalyst in embedded within the ion-conducting membrane in an amount from 0.001 to 5% by weight is disclosed.

The invention relates to the technical field of separation of natural free radical scavengers in Saxifraga tangutica, in particular to a separation process of a natural free radical scavenger in Saxifraga tangutica and application of the natural free radical scavenger. The separation process comprises the following six steps: extraction, coarse separation via a microporous resin column, online free radical scavenger component screening, preparation via a reversed-phase preparative column, reversed-phase preparative liquid chromatographic purification of Fr1-1and hydrophilic / reversed-phase two-dimensional liquid chromatographic purification of Fr1-3. The method is low in cost, and product purity is greater than 95%; a technical means adopted by the invention can realize large-scale production: requirements on raw materials are not high, cost is low, and batch preparation is easy; room-temperature cold leaching extraction with methanol is adopted, so operation is easy; the microporous resin column is adopted for coarse separation, and a microporous resin separation material can be loaded in a medium-pressure column chromatography system, so large-scale production can be easily realized; and reversed-phase preparative liquid chromatography or hydrophilic preparative liquid chromatography used in separation and purification is a rapid isocratic method.

The invention discloses a solar battery encapsulation adhesive film which comprises the following raw materials in parts by weight: 100 parts of ethylene-vinyl acetate polymer, 0.1-5 parts of organic peroxide, 0.05-10 parts of ultraviolet absorber, 0.05-5 parts of light stabilizer, 0.01-10 parts of antioxidant and 0.01-10 parts of carbon free radical scavenger, wherein the content of vinyl acetate polymer in the ethylene-vinyl acetate polymer is 25-35%; and the carbon free radical scavenger is mixture of one or more than two of benzofuranone, hydroxylamine, tertiary amine, bisphenolmonoacryate. In the invention, harmful alkyl free radicals (R.) generated by the adhesive film in thin oxygen or anaerobic state can be scavenged effectively, so that the properties of heat and humidity resisting, ultraviolet ray resisting, high / low temperature resisting, humidity-freeze resisting the like of the adhesive film are improved, the ageing and xanthochromia indexes are effectively reduced, higher light transmittance of the adhesive film is ensured, and the high efficiency of photoelectric conversion efficiency of solar batteries is ensured.

The invention relates to a high-temperature plugging agent system used for a heavy-oil thermal recovery oil reservoir. The high-temperature plugging agent system used for the heavy-oil thermal recovery oil reservoir is prepared by the following steps: stirring a main agent in water for full dissolution, slowly adding a cross-linking agent, a stabilizer, a buffering agent, a chelating agent and a free radical scavenger into an aqueous solution containing a polymer, continuing adding solid phase particles, and performing rapid stirring until the system is uniformly mixed and the particles are fully dissolved to obtain the mixed system; and the plugging agent system comprises the following components in percentages by mass: 0.05-5% of the main agent, 0.05-5% of the cross-linking agent, 0.005-0.05% of the stabilizer, 0.01-5% of the buffering agent, 0.01-1% of the chelating agent, 0.01-1% of the free radical scavenger, 1-10% of the solid phase particles and the balance of water, wherein thesolid phase particles build a bridge in the pore throat position of pores of a formation, and permeability of the pores of the formation is decreased by 50%-80%. The system disclosed by the inventioncan resist temperature of 300 DEG C and has good thermal stability; and the system disclosed by the invention has the temperature resistance superior to that of a traditional high-temperature plugging agent.

In an embodiment, an amine-oxidation inhibitor, such as a free radical scavenger and / or antioxidant, is added to an oxidation-sensitive amine, such as an amine catalyst, to inhibit oxidation of the amine. The inhibitor-treated amine may then be used in an application such as a polyurethane application to reduce the emission of undesired oxidation products from the polyurethane.

Embodiments of the present invention disclose a two-component high-tear-resistance liquid silicone rubber for mold production. The two-component high-tear-resistance liquid silicone rubber comprises a component A and a component B, wherein the component A comprises vinyl-terminated polydimethylsiloxane, terminating chain and side chain high vinyl polydimethylsiloxane, terminating chain hydroxy side chain vinyl polydimethylsiloxane, fumed silica and a catalyst, and the component B comprises vinyl-terminated polydimethylsiloxane, polydimethylsiloxane with a terminating chain containing hydrogen and a side chain containing hydrogen, an alkynol reaction inhibitor, and a free radical scavenger. Embodiments of the present invention further disclose a preparation method of the two-component high-tear-resistance liquid silicone rubber. With the two-component high-tear-resistance liquid silicone rubber of the present invention, the two-component high-tear-resistance liquid silicone rubber vulcanization precursor rubber material has good leveling property, the tear resistance after vulcanization molding is greater than 30 KN / m, the silicone rubber mold has epoxy resin corrosion resistance, the number of the rolling over of the mold achieves 45, and the silicone rubber mold has characteristics of good prevention of silicone rubber molecular chain from breaking, aging, hardening, and brittleness.

Machine perfusion solutions for the presentation of organs and biological tissues prior to implantation, including a prostaglandin having vasodilatory, membrane stabilizing, platelet aggregation prevention upon reperfusion, and complement activation inhibitory properties, a nitric oxide donor, a glutathione-forming agent, and an oxygen free radical scavenger.

The present invention has its object to provide a medical adhesive excellent in safety, reactivity (curing rate) and duration of adhesive strength. A medical adhesive of the present invention comprises a hydrophilic urethane prepolymer (UP) obtained by reacting a fluorine-containing nonaromatic polyisocyanate component (A) and a polyol component (B) having a hydrophilic polyol (B1) as the essential component, and a phenolic radical scavenger (PRS). The content of (PRS) is preferably 0.01 to 3% by weight based on the weight of (UP). The content of oxyethylene groups in (B) is preferably 30 to 100% by weight based on the weight of the oxyalkylene groups in (B). Preferably, (B) is a mixture of a random copolymer obtained by addition of ethylene oxide and propylene oxide to diols and polypropylene glycol. The content of isocyanate groups in the medical adhesive is 1 to 10% by weight based on the weight of (UP). The medical adhesive of the present invention is suitable for bonding body tissues, such as lung, artery and heart in particular.

The invention relates to the incorporation of di-sugar alcohol phosphates of C3 to C6 sugar alcohols and / or derivatives of said compounds, e.g. acids, salts, or esters, into cosmetic or dermatological formulations for protecting the skin against environmental influences. The inventive low-molecular compounds of this type take part in the active cell protection of the cell's own free-radical scavengers, antioxidants, DNA, cell membranes and other cell compartments, protecting them against harmful environmental influences, e.g. UV radiation, IR radiation and environmental stress (thermal, chemical and physical). The compatible solution can act as a co-solvent and intensify the penetration of other active ingredients added to the cosmetic formulation, not only to stabilize said ingredients in the formulation, but also to actively transport them into deeper dermal layers.

The present invention relates to polyamide moulding compounds which have an improved resistance to heat-aging and comprise the following compositions: (A) 25 to 84.99 wt.-% of at least one polyamide, (B) 15 to 70 wt.-% of at least one filler and reinforcing means, (C) 0.01 to 5.0 wt.-% of at least one inorganic radical interceptor, (D) 0 to 5.0 wt.-% of at least one heat stabilizer which is different from the inorganic free-radical scavenger under (C), and (E) 0 to 20.0 wt.-% of at least one additive. The invention further relates to moulded articles produced from these polyamide moulding compounds as components in the automobile or electrics / electronics sector.

The invention discloses a method for preparing a natural tobacco smoke free-radical scavenger and application. The method for preparing the natural tobacco smoke free-radical scavenger is characterized in that the natural tobacco smoke free-radical scavenger uses sesame leaves as raw materials and is obtained by performing solvent extraction and concentrating an extractive. The natural tobacco smoke free-radical scavenger is added into tobacco leaves or a filter tip. When a cigarette is burned, radical in tobacco smoke can be removed, health hazard in smoking is relieved, and simultaneously the method has the effects of softening smoke, removing miscellaneous gas, reducing irritation and improving smoking taste. The method is outstandingly characterized in that a new purpose is opened for the sesame leaves, dried sesame leaves are prepared, and liquid wastes of the dried sesame leaves are utilized to prepare the natural tobacco smoke free-radical scavenger with low cost, and the sesame leaves subjected to extraction can still serve as a dried vegetable to eat after dried.

The invention relates to an anti-aging antibacterial PE (Polyethylene) water service pipe. The anti-aging and antibacterial PE water service pipe comprises an inner layer, a middle layer and an outerlayer which are arranged in sequence from inside to outside, wherein the inner layer, the middle layer and the outer layer are formed by three-layer coextrusion; the inner layer is prepared from the following raw material components in parts by weight: 50 to 150 parts of PE particles, 1 to 10 parts of a dispersing agent, 1 to 10 parts of first color masterbatch and 1 to 20 parts of nano-zinc oxide; the middle layer is prepared from the following raw material components in parts by weight: 50 to 150 parts of the PE particles and 1 to 10 parts of second color masterbatch; the outer layer is prepared from the following raw material components in parts by weight: 50 to 150 parts of the PE particles, 0.5 to 10 parts of hindered amine free radical scavenger, 1 to 10 parts of third color masterbatch and 1 to 10 parts of the dispersing agent. The sufficient mixing and uniformity of the raw material components in all the layers can be ensured, so that tubes can directly be exposed to sunlight for two years and the appearance has no change or blushing.

The invention relates to pharmaceutical compositions comprising 5-Methoxytryptamine or a salt thereof for the prevention and / or treatment of mammalian cardiac tissue damage. 5-Methoxytryptamine and the salts thereof act as free radical scavengers in the prevention and / or treatment of mammalian cardiac tissue damage mediated by free oxygen radicals.

The invention discloses a smoke suppression low-odor modified asphalt coiled material coating material, a preparation method thereof and a modified asphalt coiled material. The coating material comprises matrix asphalt, a softening agent, a free radical scavenger, a metal organic framework compound, an inorganic adsorption material, a reaction type odor inhibitor, a high polymer modifier, tackifying resin, rubber powder and a filler. According to the invention, the free radical scavenger is added, so that a small molecule volatile gas generated by free radical reaction is reduced; the metal organic framework compound can be used for efficiently selectively adsorbing polycyclic aromatic hydrocarbon sulfur-containing thiophene substances and reducing the emission of the polycyclic aromatic hydrocarbon sulfur-containing thiophene substances; the inorganic adsorption material is used for reinforcing the interaction between volatile organic matters and the asphalt matrix, so that the overall emission is reduced; the reaction type odor inhibitor reacts with mercaptan in the asphalt, and the emission of the mercaptan as one of peculiar smell sources and hydrogen sulfide is reduced. The test result shows that smoke-inhibiting and odor-removing active ingredients are added, the flue gas volatilization amount of the modified asphalt coating material is reduced by more than 80% at 180 DEGC, and pollutant emission and peculiar smell source emission are remarkably reduced.

Disclosed is a scavenger of harmful active oxygen and / or free radical in a living body, which can effectively reduce the concentration of active oxygen and / or free radical in vivo and, as a result, can shows a given effect such as an effect of preventing the progression of aging, an effect of preventing a geriatric disease or a life-style related disease, an effect of enhancing health and an effect of inhibiting oxidant stress. The scavenger comprises a liquid or gas containing at least a hydrogen molecule. The medium may also contain an oxygen molecule. The medium may comprise water, an aqueous solution or a gas. The scavenger can be used for the treatment or prevention of a disorder induced by active oxygen and / or free radical.

The invention discloses a floatable and degradable microbial carrier as well as a preparation method and application thereof. The preparation method comprises the following steps: 1) dissolving a natural macromolecular gel carrier in water to form an aqueous solution, and sequentially adding a free radical scavenger and a strong oxidant into the aqueous solution for an oxidizing reaction to obtainreaction liquid of an activation intermediate containing aldehyde group; 2) adding an oxidation terminator into the reaction liquid of the step 1) to obtain a partial oxidation product of the naturalmacromolecular gel carrier; 3) performing reductive amination, alkyl grafting and alcohol precipitation separation on the partial oxidation product to obtain an amphiphilic product; 4) dissolving theamphiphilic product in water, and adding an organic macromolecular carrier, a cross-linking agent and petroleum degrading bacteria for a crosslinking reaction to obtain the floatable and degradable microbial carrier. The floatable and degradable carrier material embedding the petroleum degrading bacteria can be used for adsorbing and degrading petroleum so as to clear oil spill pollution.

The invention relates to an acetylene hydrogenation catalyst and a preparation method thereof. The preparation method comprises the following steps: 1) using an alkaline solution to process a carrier, then calcining the carrier to obtain a carrier Z; 2) loading a main active component palladium to the carrier Z to obtain a catalyst semi-finished product; and 3) mixing the catalyst semi-finished product and a solution containing a free-radical scavenger and contacting, and then performing ionizing radiation on the catalyst semi-finished product to reduce palladium to a simple substance. The prepared catalyst has good dispersibility and stability, can obviously increase the catalyst hydrogenation performance, especially increases the capability for removing microscale acetylene from CO and H2-rich gas mixture, and has good industrial application prospect.