56 results about "Citraconic Anhydrides" patented technology

The invention discloses a high-voltage rate electrolyte with high-and-low temperature performance and a lithium ion battery using the electrolyte. The electrolyte comprises a non-aqueous solvent, a lithium salt dissolved in the non-aqueous solvent and additives, wherein the non-aqueous solvent comprises propylene carbonate (PC) and linear carboxylic ester; and the additives comprise citraconic anhydride, lithium difluorophosphate (LiPO<2>F<2>), fluoroethylene carbonate, ethylene sulfate and 1, 2-di(2-cyanoethoxyl)ethane. By applying the synergistic effect generated by the solvent system and the additive optimization combination to the lithium ion battery, excellent cycle life, low-temperature discharge characteristic and high-temperature storage characteristic of the battery still can be maintained at high-voltage rate.

A hot melt adhesive composition comprising: (a) a functional copolymer obtained from copolymerization of ethylene and a comonomer selected from maleic anhydride, citraconic anhydride, itaconic anhydride, tetrahydrophthalic anhydride, maleic acid, citraconic acid, itaconic acid, fumaric acid, tetrahydrophthalic acid, the corresponding salts, monoesters and diesters of these acids, and mixtures of any of these, wherein the functional copolymer is present in an amount from about 5 to about 95 weight % of the combined total amount of (a) and (b); and (b) at least one ethylene copolymer obtained from copolymerization of ethylene with a polar monomer wherein said polar comonomer is present in the copolymer in an amount of from 8 to 40 weight %, wherein said ethylene copolymer is selected from the group consisting of ethylene/vinyl acetate copolymers, ethylene/alkyl (meth)acrylate copolymers and ethylene/alkyl (meth)acrylate/carbon monoxide terpolymers, in an amount from about 5 to about 95 weight % of the combined total amount of (a) and (b); wherein the composition has a melt index of 100 grams/10 minutes or higher. Articles comprising and process using the hot melt adhesive are also disclosed.

Biodegradable anionic polymers are disclosed which include recurring polymeric subunits preferably made up of dicarboxylic monomers such as maleic anhydride, itaconic anhydride or citraconic anhydride. Free radical polymerization is used in the synthesis of the polymers. The polymers may be complexed with ions and/or mixed with fertilizers or seeds to yield agriculturally useful compositions. The preferred products of the invention may be applied foliarly or to the earth adjacent growing plants in order to enhance nutrient uptake by the plants.

Biodegradable anionic polymers are disclosed which include recurring polymeric subunits preferably made up of dicarboxylic monomers such as maleic anhydride, itaconic anhydride or citraconic anhydride. Free radical polymerization is used in the synthesis of the polymers. The polymers may be complexed with ions and/or mixed with fertilizers or seeds to yield agriculturally useful compositions. The preferred products of the invention may be applied foliarly or to the earth adjacent growing plants in order to enhance nutrient uptake by the plants.

Biodegradable anionic polymers are disclosed which include recurring polymeric subunits preferably made up of dicarboxylic monomers such as maleic anhydride, itaconic anhydride or citraconic anhydride. Free radical polymerization is used in the synthesis of the polymers. The polymers may be complexed with ions and/or mixed with fertilizers or seeds to yield agriculturally useful compositions. The preferred products of the invention may be applied foliarly or to the earth adjacent growing plants in order to enhance nutrient uptake by the plants.

The invention provides a bionic nanocarrier for treating GBM (glioblastoma) and a preparation method of the bionic nanocarrier and belongs to the field of biomedical engineering. According to the bionic nanocarrier for treating the GBM and the preparation method of the bionic nanocarrier, Ang-RBCm-CA/siRNA comprises Ang-RBCm (Ang (Angiopep-2) polypeptide modified red blood cell membrane) and citraconic anhydride grafted polylysine and polyethylenimine-siRNA compound (CA/siRNA). Ang-RBCm-CA/siRNA can effectively carry siRNA and protect siRNA against degradation. The Ang-RBCm-CA/siRNA has prolonged blood circulation time and high blood brain barrier penetrability, can be efficiently taken in by U87MG brain glial cells over-expressed by a low-density LPR (lipoprotein receptor) and can realizerapid charge conversion in endosome/lysosome, effectively release siRNA and effectively treat in-situ U87MG GBM.

A multi-layer hose having a multi-layer structure comprising an inner layer (I) made of a fluorocopolymer and an outer layer (II) made of a polyamide resin, wherein the fluorocopolymer constituting the inner layer (I) is a fluorocopolymer which comprises polymerized units (a) based on tetrafluoroethylene, polymerized units (b) based on ethylene and polymerized units (c) based on itaconic anhydride and/or citraconic anhydride, wherein the molar ratio of (a)/(b) is from 20/80 to 80/20 and the molar ratio of (c)/((a)+(b)) is from 1/10,000 to 5/100 and which has a volume flow rate of from 1 to 1,000 mm<3>/sec., and the polyamide resin constituting the outer layer (II) is polyamide 11 and/or polyamide 12, which satisfies a condition of (terminal amino group concentration)/(terminal carboxyl group concentration)>1.

The invention provides a method for preparing citraconic anhydride and a method for isomerizing/dehydrating itaconic acid. The method for preparing the citraconic anhydride comprises the following steps of: supplying the itaconic acid to serve as a reaction initiator; in the presence of a catalytic agent, and carrying out isomerizing/dehydrating reaction on the itaconic acid or a combination containing the itaconic acid to obtain the citraconic anhydride, wherein the catalytic agent contains heteropoly acid or salt of the heteropoly acid. The method for isomerizing/dehydrating itaconic acid comprises the following steps of: supplying the itaconic acid to serve as the reaction initiator; supplying the heteropoly acid or the salt of the heteropoly acid to form a mixture with the itaconic acid; and heating the mixture so as to carry out isomerizing/dehydrating reaction on the mixture, thereby obtaining the citraconic anhydride. According to the method, the itaconic acid can be converted into the citraconic anhydride product with high yield and application value under the preparation condition of the use or non-use of a dissolvant, and the industrial volume production is easily realized.

A method for using citraconic anhydride and itaconic anhydride as addition cure end caps in reactions for forming polyamic acid oligomers and polyimide oligomers, is provided. Prepregs and high temperature adhesives made from the resulting oligomers, as well as, high temperature, low void volume composites made from the prepregs, are also provided.

The invention provides a pH (potential of hydrogen) responsive magnetic meso-porous silicon nano-particle drug controlled release system and a preparation method thereof. A structure of the drug controlled release system includes that the system is of a double-layer structure, the inner layer of the system is provided with a drug-loading magnetic meso-porous silicon nano-particle, the outer layerof the system is provided with a branched polyethyleneimine, the branched polyethyleneimine of the outer layer is treated by methylmaleic anhydride, the magnetic meso-porous silicon nano-particle is of a core-shell structure, a core is provided with a ferroferric oxide nano-particle, and a loaded drug is doxorubicin hydrochloride. The system has magnetic responsiveness, cell tracing is achieved, disease conditions are accurately diagnosed in real time, targeted delivery and controlled release of the drug is synchronously achieved, amidated PEI wraps surface of MMSN through GSH (glutathione) sensitive disulfide bonds, so that 'passive targeting' enrichment of acid response of a tumor microenvironment is achieved, step-by-step response is achieved by the aid of a mechanism of pH sensitivityand GSH sensitivity, high-accuracy targeted therapy of a cancer is achieved, and the cancer is effectively and integrally diagnosed and treated.

The invention discloses a low temperature resistant and moisture-proof treatment agent for wicker rattan. The agent is composed of a liquid A and a liquid B. the liquid A is formed by mixing the following raw materials: hydroxyl silicone oil, citraconic anhydride, veratric aldehyde, di phenyl ether, allyl polyoxyethylene ether, polyarylacetylene resin and water; and the liquid Bis made from the following raw materials by weight: albizia bark, Radix Euphorbiae Pekinensis, whiteflower cacalia seed coat, scorch-fried Cape jasmine fruit, persimmon calyx, catnip, paris rhizome, Semen Citri Reticulatae, Chinese tinospora stem and Euphorbia thymifolia. Compared with the prior art, the invention has the following advantages: two chemicals are combined, so that the agent has effective mildew proofing and anti-bacteria performance and good moisture resistance when the rattan products are in the environment of low temperature and high humidity; and the products in the harsh environment have little change properties and keep long service life.

A preparation method for citraconic anhydride by using alkaline earth metal oxide or alkali earth metal sulphate to catalyze itaconate is characterized in that alkali earth metal oxide or alkali earth metal sulphate is used as a catalyst, the mass ratio of itaconate to the catalyst is 50: 1 to 200: 1, and the mass ratio of itaconate to a solvent is 1: 1 to 1:10, reaction is carried out for 1.0-10.0 h to prepare citraconic anhydride at the reaction temperature of 130-210 DEG C, and the solvent is recycled and reused. Compared with the prior art, the preparation method has the advantages that 1, the source of the catalyst is wide, the cost is low, and the reaction speed is high; 2, the post-treatment of the product is simple, and the obtained citraconic anhydride is good in purity and high in yield; 3, the solvent is convenient to recycle and can be reused, and the recycled solvent has no influence on the productivity.

The invention discloses a furfuralcohol polymer impregnated wood material and a preparation method thereof. The furfuralcohol polymer impregnated wood material is prepared by impregnating a wood material with use of a polymerizable furfuralcohol monomer mixture; the mixture consists of the following components in percentage by weight: 50% to 85% of water, 10% to 28% of furfuralcohol, 1% to 9% of nanometer calcium carbonate, 2% to 8% of a stabilizing agent and 0.5% to 5% of an initiator, wherein the stabilizing agent is selected from a group consisting of sodium carbonate, sodium bicarbonate, sodium citrate and sodium phosphate; the initiator is selected form a group consisting of citraconic anhydride, malic acid and palmitic acid.

The invention discloses an automotive instrument panel composite with high weather resistance and a preparation method of the composite. The automotive instrument panel composite with the high weather resistance comprises components in parts by weight as follows: 30-40 parts of nylon 66, 55-75 parts of nylon 12, 5-13 parts of shell powder, 6-11 parts of citraconic anhydride, 5-12 parts of ammonium tungstate, 4-10 parts of coconut oil alkyd resin, 3-10 parts of hexafluorobutyl methacrylate, 2-3 parts of zinc stearate, 2-5 parts of an antioxidant, 5-10 parts of diisooctyl phenyl phosphite, 4-6 parts of magnesium carbonate, 1-5 parts of a coupling, 1-3 parts of a lubricant and 20-25 parts of organic clay.

The invention discloses a wood impregnated with furfuryl alcohol polymer, which is obtained by impregnating wood with a polymerizable furfuryl alcohol monomer mixture, the mixture is composed of 50%-85% (weight) water, 10%-28% ( weight) furfuryl alcohol, 1%~9% (weight) nano-calcium carbonate, 2%~8% (weight) stabilizer and 0.5%~5% (weight) initiator composition, described stabilizer is selected from sodium carbonate, The group consisting of sodium bicarbonate, sodium citrate and sodium phosphate, the initiator is selected from the group consisting of citraconic anhydride, malic acid and palmitic acid.

The invention discloses an antibacterial HDPE plastic chair suitable for outdoor use. The plastic chair comprises the following components in parts by weight: 100 parts of high density polyethylene, 15-25 parts of polypropylene, 2-6 parts of an ethylene-vinyl acetate copolymer, 1-2 parts of carboxylated polypropylene, 1-2 parts of cedar oil, 0.5-1.2 parts of epoxidized soybean oil, 0.2-1 part of sodium stearate, 1-2 parts of magnesium oxide, 2-4 parts of a high-stability antibacterial agent, 1-2 parts of a compatilizer, 1-2 parts of an antioxidant and 1-2 parts of a light stabilizer; wherein the high-stability antibacterial agent is obtained by acidolysis of calcined attapulgite and combination with 8-hydroxyquinoline; the compatilizer is a graft of polypropylene and unsaturated acid or agraft of polypropylene and anhydride; the unsaturated acid is acrylic acid or methacrylic acid, and the anhydride is maleic anhydride, fumaric acid, itaconic acid, citraconic acid, citraconic anhydride or vinyl succinic anhydride. The invention further discloses a preparation method of the antibacterial HDPE plastic chair suitable for outdoor use.

The disclosure provides a method for preparing the citraconic anhydride and a method for isomerizing/dehydrating itaconic acid. The method for preparing the citraconic anhydride includes the following steps: providing itaconic acid as a starting material; and subjecting the itaconic acid to an isomerization/dehydration reaction in the presence of a catalyst to obtain the citraconic anhydride, wherein the catalyst includes a heteropolyacid or heteropolyacid salt.

The invention relates to an active energy ray-cured resin compound, and a coloring partition and a black matrix for a display element. The coloring partition and/or the black matrix for the display element is excellent in voltage holding ratio and sealing performance. The active energy ray-cured resin compound for the coloring partition or the black matrix for the display element contains (A) reactive polycarboxylic compound, (B) reactive compounds, (C) a photopolymerization initiator, (D) black pigment, (E) dispersant and (F) organic solution, wherein the reactive polycarboxylic compound(A) is obtained trough reaction between a reaction product of epikote (a) with at least two epoxy groupsin one molecule, a compound(b) with more than one polymerizable olefinic unsaturated groups and more than one carboxyls and a compound with at least two hydroxys and more than one carboxyl, and itaconic anhydride and/or citraconic anhydride as polybasic anhydride (d).

The present invention discloses an universal antigen retrieval buffer solution, which is characterized in that: the buffer solution comprises citraconic anhydride 0.5 g / L; and nonionic surfactant 5ml / L; the preparing method of the buffer solution has following steps with preparation of one liter buffer solution as an example: weighing 0.5 g of citraconic anhydride, taking a 1000 ml beaker, dissolving 0.5 g of citraconic anhydride, dissolving in 800 ml of distilled water, stirring and mixing; adding 5 ml of nonionic surfactant to the mixed solution, stirring and mixing; adjusting pH valueto 7.4 with an NaOH solution of an equivalent concentration of 1N; then taking a 1000 ml graduated cylinder and pouring the solution with the pH value of 7.4 into the graduated cylinder and fixing volume to 1000 ml with distilled water. The universal antibody retrieval solution can be applied to most of antibodies using thermal retrieval for antigen retrieval, can greatly facilitate accurate application of immunohistochemical antigen retrieval methods for pathology and scientific research.

The invention relates to a novel synthetic method for 1,3-bis((3-methyl-2,5-dioxopyrrol-1-yl)methyl)benzol. The novel synthetic method comprises the following steps: citraconic anhydride, m-xylylenediamine and a solvent are mixed in proportion and subjected to thermal reaction for multiple hours, the solvent is removed through reduced pressure distillation after the reaction, a mixed solvent is added for recrystallization, and a product is obtained after cooling, filtering and drying. The novel synthetic method is simple to operate, stable, reliable, high in reaction yield and applicable to industrial production, the requirement for equipment is low, the purity can reach 98%, and the production cost is reduced greatly through recycling of the solvent.

The invention discloses a moistureproof antistatic polypropylene composite for an instrument. The moistureproof antistatic polypropylene composite is prepared from, by weight, 80-105 parts of polypropylene, 30-50 parts of polyving akohol, 24-43 parts of phenol bi-ring pentadiene epoxy resin, 8-20 parts of wollastonite, 6-15 parts of indium tin oxid, 5-13 parts of shell powder, 6-11 parts of citraconic anhydride, 5-12 parts of ammonium tungstate, 3-10 parts of hexafluorobutyl methacrylate, 4-9 parts of lithium oxide, 4-10 parts of a silane coupling agent KH792, 2-11 parts of an antistatic agent and 3-8 parts of plasticizer. The invention further discloses a preparation method of the composite. The surface resistance of the polypropylene composite prepared through the preparation method is larger than 108 omega, better antistatic property is achieved, in addition, the tensile strength of the polypropylene composite is 25-39 MPa, the bending strength is 46.7-53.4 MPa, and the actual application requirements can be met.