Abstract: The invention relates to a two- or multi-component system having: at least one polyester component 1 which comprises: i) at least one unsaturated polyester; ii) at least one ethylenically unsaturated monomer; iii) at least one inorganic thickener (a1); and iv) at least one wetting- and dispersing agent (a2) that inhibits the thickening action of the inorganic thickener (a1); and at least one initiator component 2 which i) comprises at least one component (b1) that is able to at least partly neutralise the inhibition of the thickening action of the inorganic thickener (a1) and ii) at least one initiator that is able to trigger the polymerisation of components (i) and (ii) of the polyester component 1. The wetting- and dispersing agent (a2) is non-reactive in relation to components (i) and (ii) of the polyester component 1. The invention also relates to substrates coated with a two- or multi-component system according to the invention.

Abstract: Disclosed herein a composition comprising a urethane of the FIG. 3; where hydroxyl or amine linkages on the urethane of the FIG. 3 are functionalized with molecules that contain fluorine atoms, phosphorus atoms, sulfur atoms, unsaturated carboxylic acids, derivatives of unsaturated carboxylic acids, or combinations thereof. Disclosed herein too is a composition comprising a urethane of the FIG. 3; where hydroxyl or amine linkages of the urethane of the FIG. 3 are functionalized with molecules that contain fluorine atoms, phosphorus atoms, sulfur atoms, unsaturated carboxylic acids, derivatives of unsaturated carboxylic acids, or combinations thereof; and a polymeric resin.

Abstract: The object of the present invention is to provide a polymer brush which forms phase-separated structure in a gas phase. The polymer brush according to the present invention comprises a substrate and a polymer layer wherein the polymer layer comprises polymer chains each of which has one end fixed on the substrate and other end free-ended, and wherein a state of phase-separation between a polymer dense part and a polymer thin part reversibly changes in the polymer layer.

Abstract: The present application is directed to methods for preparation of carbon materials. The carbon materials comprise enhanced electrochemical properties and find utility in any number of electrical devices, for example, as electrode material in ultracapacitors or batteries.

Abstract: The polymerized rosin compound of the invention includes a rosin dimer component (A) including a bifunctional rosin dimer component (a1) represented by formula (1): ROOC—X—COOR, wherein X represents a rosin dimer residue, and R represents hydrogen, an alkyl group of 1 to 5 carbon atoms, or a benzyl group, wherein the rosin dimer component (A) contains a content of the bifunctional rosin dimer component (a1) of 80% by weight or more and the polymerized rosin compound contains a content of the rosin dimer component (A) of 80% by weight or more. The polymerized rosin compound contains a large amount of the bifunctional rosin dimer component and makes it possible to obtain linear polymer with a high molecular weight.

Abstract: The invention relates to a method for the continuous production of stable prepolymers based on high-melting diisocyanates, in particular, 1,5-naphthalindiisocyanate, and to the use thereof for producing polyurethane elastomers, in particular casting elastomers.

Abstract: The present invention relates to the use of nitrogenous compounds of formula (I) and/or corresponding quaternized and/or protonated compounds for production of polyurethanes, to compositions comprising said compounds and also to polyurethane systems, in particular polyurethane foams, obtained using said compounds.

Abstract: The disclosure provides methods to synthesize graphene based hetero-nanostructures, the graphene based hetero-nanostructures resulting therefrom, and devices comprising the graphene based hetero-nanostructures thereof.

Abstract: The present invention relates to a purifying apparatus for polycarbonate polyols, especially for removal of cyclic alkylene carbonates, comprising an evaporation unit (1) provided with a heater (10) and having an inlet (6) disposed at the top end thereof and a bottoms vessel (11), and a stripping column (2) connected downstream of the evaporation unit (1) and having a top (21) and a bottom (23), wherein a feed (5) for the polycarbonate polyol to be purified opens into the inlet (6) to the evaporation unit (1) and a gas outlet line (12) and a connecting line which opens into the top (21) of the stripping column (2) and is equipped with a pump (18) depart from the evaporation unit (1), and wherein a gas inlet line (24) for an inert gas opens into the bottom (23) of the stripping column (2) and a product line (27) for the purified polycarbonate polyol departs from the bottom (23) of the stripping column (2) and a gas outlet line (25) departs from the top (21) of the stripping column (2).

Abstract: Provided is a monomer composition that has rapid curability and can be rapidly cured, even in the presence of oxygen and/or water, to form a cured product having excellent adhesion to a wide variety of substrates. The monomer composition according to the present invention includes at least one cationically curable monomer. The at least one cationically curable monomer includes at least one of 3-allyloxyoxetane and 3-(2-ethylhexyloxy)oxetane. The at least one of 3-allyloxyoxetane and 3-(2-ethylhexyloxy)oxetane is present in a total content of 5 weight percent or more of the total weight of the monomer composition.

Abstract: Amide compounds, amide polymers, compositions including amide compounds and amide polymers may be used to bind target ions, such as phosphorous-containing compounds in the gastrointestinal tract of animals. In some cases, amide compounds and amide polymers may include a core derived from an amide polyol and an organic polyacid or ester.

Abstract: A polyimide is provided. The polyimide includes a repeating unit represented by formula 1.

Abstract: Disclosed is a curable sealant composition including: (i) a thiol-terminated prepolymer and/or monomers thereof, wherein the thiol-terminated prepolymer is a polythioether or a polysulfide; (ii) an “ene” crosslinker having a molecular weight of about 100 to about 5000; and (iii) a pH indicator molecule including a quantum dot functionalized with a pH-responsive ligand. Methods for determining a sufficient cure state of a composition by combining the thiol-terminated prepolymer and/or monomers thereof and the “ene” crosslinker with a pH indicator molecule, including a quantum dot functionalized with a pH-responsive ligand, and (ii) then subjecting a resultant mixture of (i) to curing conditions until the mixture changes its color are also disclosed.

Abstract: A siloxane polymer is made by providing a first compound having the chemical formula SiR1aR24-a where a is from 1 to 3, R1 is a reactive group, and R2 is an alkyl group or an aryl group, and providing a second compound having the chemical formula SiR3bR4cR54-(b+c) where R3 is a cross-linking functional group, R4 is a reactive group, and R5 is an alkyl or aryl group, and where b=1 to 2, and c=1 to (4?b). The first and second compounds are polymerized together to form a siloxane polymer. The siloxane polymer can be then used in a final composition where the siloxane polymer comprises from 5 to 100% by weight, and filler (e.g. microparticles, nanoparticles, nanowires, etc.) comprises from zero to 95% by weight. The siloxane polymer composition is useful in a variety of areas such as an adhesive, e.g. as a die attach adhesive in semiconductor (e.g. LED) packaging applications, encapsulants, optical coatings, protective coatings, and other applications.

Abstract: In an example, a thermal interface material includes a polymeric phase-change material.

Abstract: A manufacture method for fullerence/PEDOT:PSS mixed solution and a manufacture method for compound transparent conductive film having fullerence/PEDOT:PSS are provided in the present invention: making fullerence/PEDOT:PSS mixed solution to manufacture a transparent conductive film; sources of applicable materials are broad and prices thereof are cheap; the fullerence/PEDOT:PSS mixed solution can be further utilized to manufacture a compound transparent conductive film having fullerence/PEDOT:PSS on substrates or a variety of devices; the present invention discloses a manufacture method for a compound transparent conductive film having fullerence/PEDOT:PSS, and when manufacturing the compound transparent conductive film having fullerence/PEDOT:PSS via wet coating process which is with low cost and high efficiency comparing with manufacture of ITO film, and furthermore expensive PVD equipment can be waived, production cost can be reduced, manufacturing method can be simplified at the same time, production time

Abstract: A method for producing a wet rubber masterbatch uses a single-screw extruder. The single-screw extruder includes a screw, and an external cylinder in which a slit extended along the length direction of the external cylinder (the screw-shaft direction) is formed in an internal wall surface of the external cylinder, and when the width of the slit is represented by A and the clearance between a crest of the screw and the internal wall surface of the external cylinder is represented by B, the following expression (1) is satisfied: 0<AB(Y)/AB(X)<0.9??(1) wherein AB (Y) is the product of A and B at a downstream side along the screw-shaft direction of the external cylinder, and AB (X) is the product of A and B at an upstream side along the screw-shaft direction of the external cylinder.

Abstract: The present invention relates to the use of hydrophopic polyols for producing fiber composite components on the basis of a polyurethane/polyisocyanurate reaction mixture, to a method for producing composite components and to the composite components as such. The method according to the invention is particularly economical in terms of saving material and time costs and the composite components obtained are characterized by excellent visual and material properties.

Abstract: Several examples of an article of manufacture made with an additive manufacturing machine are disclosed. A length of fiber reinforcement is provided to a nozzle. The fiber reinforcement is embedded into a stream of a base polymer material at the nozzle and deposited as a bead of composite polymer material having fiber reinforcement. The fiber reinforcement may be dry or pre-impregnated with a reinforcing polymer. The additional strength of the composite polymer material having fiber reinforcement allows for true, three-dimensional printing of articles having unsupported regions.

Abstract: Embodiments herein relates to a butylene terephthalate-containing multi-layer, such as a biaxially oriented polyester (BOPET) film, for lamination on metal sheets, which could be used for food containers. The BOPET film has an outer release layer, which aids in the release of food, such as a high protein food source, when food is cooked and sterilized in direct contact with the outer release layer. The BOPET film can be laminated to metals used in the manufacture of food containers with the outer release layer being exposed to allow a direct food contact between the surface of the outer release layer and food. More particularly, the invention relates to a novel outer release layer resin composition comprising an ultra high molecular weight siloxane polymer and a polyethylene trephthalate resin.

Abstract: An encapsulating sheet formed from an encapsulating composition including: a silicone resin composition containing alkenyl group-containing polysiloxane, a hydrosilyl group-containing polysiloxane, and a hydrosilylation catalyst; and an inorganic filler having a refraction of 1.50 or more and 1.60 or less and an average particle size of 10 ?m or more and 50 ?m or less. In the average composition formula (1) and the average composition formula (2), at least one of R2 and R3 includes a phenyl group. A product produced by reaction of the silicone resin composition is represented by the average composition formula (3) below. R5eSiO(4-e)/2??average composition formula (3): The phenyl group content in R5 of the average composition formula (3) is 30 mol % or more and 55 mol % or less.

Abstract: A film having high heat resistance and a low total haze value and yellowness index. The film includes a fluorinated polyimide layer having a total haze value of 4 or lower, a yellowness index of 3 or lower, and a total luminous transmittance of 90% or higher.

Abstract: Microporous sheet product and methods of making and using the same. In one embodiment, the microporous sheet product is made by a process that includes melt-extruding a sheet material using an extrusion mixture that includes a thermoplastic polymer, a non-cross-linked elastomer having a molecular weight of at least 50,000 Da, and a compatibilizing agent. By way of example, the thermoplastic polymer may be a polyolefin, the non-cross-linked elastomer may be a polyisobutylene, and the compatibilizing agent may be mineral spirits. After extrusion, the sheet material may be cooled, and the sheet material may be stretched. The microporous sheet product may be used, for example, as a battery separator, as a food packaging material, as a diffusion barrier in the ultrafiltration of colloidal matter, and in disposable garments.

Abstract: A cyclic olefin resin composition film having excellent anti-blocking properties and toughness. The cyclic olefin resin composition film containing a cyclic olefin resin and a styrene-based elastomer; the cyclic olefin resin composition film having a first surface layer part having a thickness of from 25 to 45% of total thickness, a second surface layer part having a thickness of from 25 to 45% of the total thickness, and an internal part having thickness of from 10 to 50% of the total thickness between the first surface layer part and the second surface layer part; an average value of minor-axis dispersion diameter of the styrene-based elastomer in the first surface layer part or the second surface layer part being from 75 to 125% of an average value of minor-axis dispersion diameter of the styrene-based elastomer of the internal part. As result, it is possible to achieve excellent anti-blocking properties and toughness.

Abstract: Provided are a functional polymer membrane including: a surface layer; and an anion exchange membrane or a cation exchange membrane, in which the surface layer contains a polymer which includes a cross-linked structure having, in a cross-linking unit, an ionic group with a charge opposite to a charge of an ionic group included in at least one of the anion exchange membrane or the cation exchange membrane; a production method thereof, and a stack or a device provided with a polymer functional membrane.

Abstract: Provided is a functional polymer membrane including a porous support; and a resin layer and an auxiliary layer which are supported by the porous support, in which both of the resin layer and the auxiliary layer contain an ion exchange polymer having one of an anion exchange group and a cation exchange group, a charge of the ion exchange group of the ion exchange polymer included in the resin layer is opposite to a charge of the ion exchange group of the ion exchange polymer included in the auxiliary layer, and both of the ion exchange polymers respectively included in the resin layer and the auxiliary layer are polymers having a unit obtained from an acryloyl group which may have an alkyl group at the ?-position; a stack or a device provided with a functional polymer membrane; and a method of producing, a functional polymer membrane.

Abstract: A mounting foam contains polyols, isocyanates, plasticizers, surfactants, a catalyst and gases. The foam contains polyols from 30% to 35% and gases from 15.5% to 17.5%, where the ratio of NCO:OH is from 3.4 to 3.9. The foam is used as an adhesive for coatings and to fill voids in structures.

Abstract: This invention relates to thermoset, thermal insulating panel, pour-in-place and spray foams having desirable and unexpectedly low thermal conductivity, and to compositions, method and systems which use and/or are used to make such foams comprising: (a) providing thermosetting foam forming component and a blowing agent for forming predominantly closed cells in the foam, wherein the blowing agent comprises: (i) cis-1,1,1,4,4,4-hexafluoro-2-butene (HFO-1336mzzm(Z)) and water, with the HFO-1336mzzm(Z) and water in the blowing agent together comprising at least about 50% by weight of the total of all components in the blowing agent and (ii) the weight ratio of HFO-1336mzzm(Z) to water in the blowing agent is from about 90:10 to less than 98:2 and (b) forming foam from said provided foamable composition.

Abstract: Provided is an anti-vibration rubber composition, including: the following component (A); and the following components (B) and (C), in which a blending amount of the component (B) falls within a range of from 15 parts by weight to 60 parts by weight with respect to 100 parts by weight of the component (A), and a blending amount of the component (C) falls within a range of from 50 parts by weight to 150 parts by weight with respect thereto. Thus, the anti-vibration rubber composition is excellent in anti-vibration rubber properties, such as rubber physical properties and durability, and is excellent in flame retardancy. (A) A diene-based rubber. (B) A halogen-based flame retardant having a melting point of 150° C. or less. (C) Aluminum hydroxide having an average particle diameter of 0.75 ?m or less.

Abstract: A liquid colorant for use in molding or extruding plastic products comprises pigment dispersed in cottonseed oil.

Abstract: An internal mold release agent (IMRA) which effectively releases a cured polyurethane (PU) material from a metal, in particular steel, mold. The IMRA is a surface active agent containing phosphorus or a combination (blend or reaction product) of the agent with other chemicals. In one embodiment the agent is a phosphate ester. In one embodiment the agent is polyoxyethylene alkyl phosphate ester. A polyurethane formulation comprising the IMRA has high formulation stability, clean release, low release strength, and high product transparency.

Abstract: Provided is a resin composition including a polycarbonate and a phosphorus-containing compound, wherein a content rate of the phosphorus-containing compound in the resin composition is less than 14 percent by mass, wherein the phosphorus-containing compound includes a phosphazene derivative represented by general formula (1) below and a phosphoric acid ester, wherein a content rate of the phosphazene derivative in the resin composition is 0.1 percent by mass or greater but less than 3.0 percent by mass, and wherein a resin specific gravity (D0) of the resin composition before burned in a UL94V test and a resin specific gravity (D1) of the resin composition after burned in the UL94V test satisfy a relationship of D1/D0>0.85, where in general formula (1), R1 and R2 each independently represent an aromatic ring-containing group free of a halogen atom, and m represents any of from 3 through 8.

Abstract: There is provided herein a composition comprising (a) a mercapto-functional silicon compound having the general Formula (I): and a reactive resin containing at least one epoxy and/or (meth)acrylate group. There is also provided a silylated resin resulting from the reaction product of mercapto-functional silicon compound (a) and reactive resin contain at least one epoxy and/or (meth)acrylate groups.

Abstract: A rubber composition for tires comprises a diene rubber, silica, and a silane coupling agent, and is characterized in that a function v of a shear modulus G? of the rubber composition at 0.28% shear stress at 110° C., a CTAB specific surface area (CTAB) of the silica, a volume fraction ((?) of the silica in the rubber composition, and a stress at 100% elongation (M100) of the rubber composition satisfies the relationship of the following equation (i): G?=K×v, where K is a coefficient greater than 0 and not greater than 450, and v is represented by the following equation (ii): v=?×(1+0.0258×CTAB×M100) and is a real number not less than 2.5 and not greater than 20.

Abstract: A degradable polymer composition comprises a polyurethane comprising ester groups in a backbone of the polyurethane and carboxylic acid groups attached to the backbone of the polyurethane; and a filler comprising one or more of the following: a powder comprising particles having an average particle size of about 5 microns to about 500 microns; or a fiber having an average length of about ? inch to about 5 inches. Also disclosed are articles comprising the composition. A method to degrade the article includes exposing the article to a fluid at a temperature of about 25° C. to about 300° C.

Abstract: The present invention relates to microspheres and to the use thereof, preferably as laser-absorbing additive, and to a process for the production thereof.

Abstract: Provided are a rubber composition for tire tread and a tire produced using this rubber composition. The rubber composition for tire tread includes 100 parts by weight of a raw material rubber, 10 to 30 parts by weight of carbon black, and 10 to 80 parts by weight of a master batch including a synthetic rubber that contains a high cis-1,4-polybutadiene rubber matrix and syndiotactic 1,2-polybutadiene dispersed in the rubber matrix. The rubber composition for tire tread can enhance the cut-chip performance and the initial grip performance of a tire produced therefrom.

Abstract: A rubber composition for tires according to the present technology comprises: a natural rubber, a diene-based blended rubber containing a solution-polymerized SBR and an emulsion-polymerized SBR, an aromatic modified terpene resin, a silica, and a carbon black. The solution-polymerized SBR contains a specific solution-polymerized SBR having a block containing an isoprene unit at one terminal thereof and a modified terminal for silica at the other terminal thereof. The styrene unit content in the emulsion-polymerized SBR is from 35 to 50 mass %. The content of the natural rubber and the total content of the solution-polymerized SBR and the emulsion-polymerized SBR in the diene-based blended rubber are specified, and the contents of aromatic modified terpene resin, the silica, and the carbon black relative to the content of the diene-based blended rubber are specified.

Abstract: A rubber obtained by cross-linking a highly saturated nitrile rubber composition has a carboxyl group-containing highly saturated nitrile rubber (A1) containing 15 to 60 wt % of ?,?-ethylenically unsaturated nitrile monomer units and 1 to 60 wt % of ?,?-ethylenically unsaturated dicarboxylic acid monoester monomer units and having an iodine value ?120, a highly saturated nitrile rubber (A2) containing ?,?-ethylenically unsaturated nitrile monomer units in 15 to 60 wt %, having a content of ?,?-ethylenically unsaturated dicarboxylic acid monoester monomer units of 0.9 wt % or less, and an iodine value of 120 or less, a polyamide resin having a melting point ?150° C., and a cross-linking agent. In the composition, a weight ratio of “(A1):(A2)” is 5:95 to 95:5 in range, a weight ratio of “total of (A1) and (A2):polyamide resin” is 95:5 to 50:50, and a storage elastic modulus of the cross-linked rubber at 150° C. is 5 MPa or more.

Abstract: The present invention relates to a multimodal polyethylene composition which can be manufactured into pipes showing improved pressure resistance comprising a high density multimodal ethylene polymer component (A) having a density of at least 930 kg/m3, and a MFR21 of not more than 15 g/10 min, wherein said composition exhibits a LAOS-NLF defined as L ? ? A ? ? O ? ? S - N ? ? L ? ? F = ? G 1 ? G 3 ? ? where G1?—first order Fourier Coefficient G3?—third order Fourier Coefficient of at least 1.7. Such a polyethylene composition is useful for the manufacture of pressure pipes that exhibit improved pressure resistance and creep resistance and do not undergo sagging. Further disclosed is a process for the production of a pipe using such a multimodal polyethylene composition and a pipe comprising such a multimodal polyethylene composition.

Abstract: Breathable films formed from polyethylene are provided that can have desirable properties. In one aspect, a breathable film comprises a layer formed from a composition comprising a first composition, wherein the first composition comprises at least one ethylene-based polymer and wherein the first composition comprises a MWCDI value greater than 0.9, and a melt index ratio (I10/I2) that meets the following equation: I10/I2?7.0?1.2×log(I2).

Abstract: A thermoplastic polypropylene composition comprising polypropylene, a hydrogenated block copolymer, 3 to 6 wt % high density polyethylene, a processing oil, and greater than or equal to 3 wt % of a surface modifier comprising an ultra high molecular weight polydialkyl siloxane, an ultra-high molecular weight polydialkyl siloxane in combination with silica, a polyolefin siloxane or a combination thereof, wherein weight percent is based on the total weight of the composition.

Abstract: The present invention provides polymer modified aqueous urea formaldehyde resin (UF resin) binder compositions useful in making a treated glass mat, e.g., for roofing shingles, wherein the polymer modifier is an multistage aqueous emulsion acorn copolymer comprising one protuberant polymer stage containing phosphorous acid groups and one or more other polymer stage comprising an addition copolymer incompatible with the protuberant polymer stage, wherein the multistage aqueous emulsion copolymer has a measured Tg of from ?60 to 25° C., or, preferably from 31 30 to 12° C. and, further wherein the weight ratio of the total of monomers used to make the one or more other polymer stage to the total amount of monomers used to make the protuberant polymer stage ranges from 3:1 to 50:1, or, preferably, from 3:1 to 30:1 or, more preferably, from 3:1 to 20:1, or, even more preferably, from 8:1 to 12:1.

Abstract: A self-healing composite material includes a polymer matrix, microcapsules filled with a ring-opening metathesis-active monomer (e.g., norbornene, norbornene derivatives such as ethylidene norbornene, or cyclooctadiene), and polymeric particles comprised of a polymer that is soluble in the monomer with which the microcapsules are filled and having catalytic endgroups derived from an olefin metathesis catalyst, such as a Grubbs'-type catalyst. In some embodiments, the polymer having catalytic endgroups is synthesized via solution polymerization of a ring-opening metathesis-active monomer (e.g., norbornene, norbornene derivatives, or cyclooctadiene) in the presence of an olefin metathesis catalyst (e.g., Grubbs' 1st generation catalyst). The polymer having catalytic endgroups may then be processed via a grinding operation, for example, to prepare the small polymeric particles. In other embodiments, the polymeric particles are synthesized directly as microparticles (e.g., microspheres, granules, beads, etc.

Abstract: A rubber composition is based on at least one predominant elastomer comprising epoxide functional groups, silica as predominant reinforcing filler, an agent for covering the silica, and a system for crosslinking the elastomer comprising an imidazole and a polycarboxylic acid of general formula (I): and an imidazole of general formula (II):

Abstract: The invention relates to a process for the preparation of a semi-crystalline semi-aromatic polyamide copolymer (Co-PA) having a melting temperature (Tm-Co-PA) of at least 300° C., comprising steps of (a) preparing a first semi-crystalline semi-aromatic polyamide (A), having a melting temperature (Tm-A) of at least 310° C.; and consisting of repeat units derived from 45-50 mol % terephthalic acid; 47.

Abstract: An acrylic composition includes a first component that accounts for 20 wt % to 40 wt % of the total weight of the acrylic composition and the first component includes an olefin block copolymer comprising hard segments and soft segments, of which the soft segments have from 9 mol % to less than 15 mol % of comonomer content. A second component of the acrylic composition accounts for 25 wt % to 70 wt % of the total weight of the acrylic composition and the second component includes at least one oil and at least one polyolefin. A third component of the acrylic composition accounts for 15 wt % to 65 wt % of the total weight of the acrylic composition and the third component includes acrylic particles having an average particle size from 0.5 ?m to 30 ?m and at least one inorganic filler. The acrylic particles account for at least 10 wt % of the total weight of the third component.

Abstract: The invention relates to a method for the preparation of a polymerized CNSL composition, the method comprising subjecting a raw or technical CNSL to a heat treatment under reflux to obtain the polymerized CNSL composition, wherein the heat treatment is performed until the polymerized CNSL composition has a molecular weight Mw of about 2800 to about 3700, such as from about 2900 to about 3600, or from about 3000 to about 3500 g/mol. The invention further relates to a polymerized CNSL composition, use of a polymerized CNSL composition according to the invention in a bitumen composition, a modified bitumen composition according to the invention and an asphalt composition comprising a modified bitumen composition according to the present invention.

Abstract: The present invention provides carbon quantum dots, preparation method and uses thereof. The preparation method of the carbon quantum dots comprises the following steps: (1) preparing a dispersion of carbon based material; (2) mixing a solution of halogenated quinone with the dispersion of carbon based material and preparing a dispersion of carbon based-halogenated quinone composite material by halogenated quinone grafting method; (3) adding a solution of H2O2 to the dispersion of carbon based-halogenated quinone composite material and carrying out reaction thereof, obtaining reaction products; (4) carrying out solid-liquid separation to the reaction products, with the resulting filtrate continuing to react, thus obtaining a dispersion of carbon quantum dots. This method adopts metal-free catalytic oxidation, the process of which is safe, convenient and low-cost, and is performed under a mild reaction condition without adding additional substances which are difficult to be separated.

Abstract: Provided is a copper powder in which the number of contact points between copper powder particles is increased to allow excellent electric conductivity to be achieved, and which can be used suitably in use applications including an electrically conductive paste and an electromagnetic wave shield. The copper powder according to the present invention has a dendritic shape composed of a main stem that is grown linearly and multiple branches that are branched from the main stem, wherein the main stem and the branches are composed of a flat-plate-like cupper particle having a cross section with an average thickness of 0.2 to 1.0 ?m, and the average particle diameter (D50) of the copper powder is 5.0 to 30 ?m. A copper paste having excellent electric conductivity can be produced by mixing the dendritic copper powder with a resin.