351 results about "Phthalic acid anhydride" patented technology

A method of manufacture of a bis(phthalimide) composition includes reacting, in the presence of a solvent and a catalytically active amount of an imidization catalyst selected from quaternary ammonium salts, quaternary phosphonium salts, and combinations thereof, a substituted phthalic anhydride with an organic diamine, wherein conversion to the bis(phthalimide) is 99% complete in less than 6 hours.

The invention discloses a preparation method for a biological agent for preventing and controlling human papilloma virus infection. The preparation method includes following steps: dissolving 3-hydroxy-phthalic anhydride HP into dimethyl sulfoxide DMSO to obtain saturated HP solution; dissolving beta-lactoglobulin beta-LG into 0.1M of sodium phosphate solution with pH (potential of hydrogen) of 8.5 to obtain protein solution with protein final concentration of 20mg / mL; and equally dividing the HP solution into five parts, adding the HP solution into the protein solution at every 12 minutes, shaking and mixing, adjusting pH of IMNaOH to be 8.5, leading the final concentration of anhydride in a reaction system to be 60mM, standing for 1 hour at the temperature of 25 DEG C, dialyzing by PBS (phosphate buffer solution) with pH of 7.4, performing filtration sterilization by a 0.45uM microfiltration membrane, and storing at the temperature of 4 DEG C so as to obtain a finished product. The biological agent has the advantages of capabilities of stopping HPV (human papilloma virus) from invading cells and stopping virus infection from spreading, safety, stability, low cost and the like.

The invention discloses a preparation method of 4,4'-(Hexafluoroisopropylidene) diphthalic anhydride (6-FDA), belonging to the technical field of liquid crystal materials. The main technical scheme is achieved as follows: o-xylene and 2,2-dichloro-hexafluoropropane undergo alkylation reaction in an ionic liquid under the catalytic action of Lewis acids (AlCl3, ZnCl2) to obtain 4,4'-(Hexafluoroisopropylidene) di(2-xylene); then the 4,4'-(Hexafluoroisopropylidene) di(2-xylene) is oxidized by permanganic acid TEBA triethylbenzylammonium salts to obtain 4,4'-(Hexafluoroisopropylidene) diphthalandione; and finally, the 4,4'-(Hexafluoroisopropylidene) diphthalandione is dehydrated by acetic oxide to obtain the 4,4'-(Hexafluoroisopropylidene) diphthalicanhydride (6-FDA). The preparation method has the advantages of mild reaction condition, less three-waste emission and high yield.

The invention belongs to the field of a cable, and discloses a cold-resistant and high-temperature resistant cable material. The cold-resistant and high-temperature resistant cable material is prepared from the following raw materials in parts by weight: 20-22 parts of dicyclopentadiene phenol epoxy resin, 15-16 parts of polypropylene resin, 6-8 parts of gamma-aminopropyltriethoxysilane, 5-6 parts of phthalic anhydride, 5-6 parts of alpha-methacrylic acid, 3-4 parts of modified kaolinite, 3-4 parts of modified kieselguhr, 2-3 parts of dimethyaminoethoxyethanol, 2-3 parts of glass fiber, 1-2 parts of polyethylene glycol, 1-2 parts of polyglycolic acid, 1-2 parts of triallyl isocyanurate, 1-2 parts of aluminium hydroxide, 1-2 parts of antimonous oxide and 1-2 parts of titanium carbide. The invention also discloses a preparation method of the cable material. The cable material prepared by the method is good in cold resistance and high-temperature resistance, and wide in application field.

The invention discloses a rubber composition used for automobile, which comprises the following raw materials: natural rubber, cis-1,4-polybutadiene rubber, butadiene-styrene rubber, a vulcanizing agent DTDM, sulphur, a promoter NS, a promoter CZ, a promoter NOBS, a promoter D, a promoter Rheineck ZBOP / S, benzoic acid, phthalic anhydride, high wear resistant carbon black, modified white carbon black, zinc oxide, stearic acid, an activator EBS, a rubber homogenizing agent, a protection wax OK5194, a rubber protection wax LY-01, aromatic hydrocarbons oil, an antioxidant 4020, an antioxidant V-3100, an antioxidant RD, an antioxidant 800-A, an antioxidant HS-911, an antioxidant FR, a tackifying resin E1102, and wax objects. The rubber composition has good wear resistance and heat resistance, so that the rubber composition with good comprehensive performance used for the automobile is obtained.

The purpose of the present invention is to provide a two-component curable oxygen-absorbing resin composition that has both oxygen-absorbing and adhesive properties and cohesive power. The resin for an oxygen-absorbing adhesive is a polyester comprising structural units derived from an acid component (A) and an acid component (B), wherein the ratio of the acid component (A) to total acid components is 70 to 95 mol %, the ratio of the acid component (B) to total acid components is 0 to 15 mol %, the polyester has a glass transition temperature of −20° C. to 2° C., the resin is cured using a hardening agent, the acid component (A) is tetrahydrophthalic acid or a derivative thereof, or tetrahydrophthalic acid anhydride or a derivative thereof, and the acid component (B) is phthalic acid.

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.

Improved process for the preparation of the intermediate compound of formula II for formation of biological active tetrahydrobenzothiazole compound of formula (I) as well as the biological active tetrahydrobenzothiazole compound of formula (I) and / or its pharmaceutically acceptable salts or solvates. The process comprises reacting 4-amino cyclohexanol of formula (III) or its acid addition salts with phthalic anhydride in presence of acid catalyst and their salts, in polar aprotic solvent or its mixture with organic solvent, capable of removing water azeotropically to give 4-(phthalimido)-cyclohexanol of formula (IV); oxidizing 4-(phthalimido)-cyclohexanol of formula (IV) to give 4-(phthalimido)-cyclohexanone of formula (V); brominating 4-(phthalimido)-cyclohexanone of formula (V) with brominating agent in organic solvent in presence of Lewis acid catalyst to prepare 2-bromo-4-(phthalimido)-cyclohexanone of formula (VI); treating 2-bromo-4-(phthalimido)-cyclohexanone of formula (VI) with thiourea in organic solvent in presence of base to give 2-amino-6-phthalimido-4,5,6,7-tetrahydro benzothiazol of formula (VII); reacting compound of formula (VII) with hydrazine hydrate and base in polar solvent to give racemic 2,6-diamino-4,5,6,7-tetrahydro-1,3-benzothiazole of formula (VIII); resolving racemic 2,6-diamino-4,5,6,7-tetrahydro-1,3-benzothiazole of formula (VIII) to prepare (6S)-2,6-diamino-4,5,6,7-tetrahydro-1,3-benzothiazole of formula (II). To form the compound of Formula I and if desired its salts / solvates the above process is carried out with further steps of coupling (6S)-2,6-dimino-4,5,6,7-tetrahydro-1,3-benzothiazole of formula (II) with propionaldehyde in presence of mineral acid in polar organic solvent and reducing agent to prepare (S)-(−)-2-Amino-6-(n-propylamino)-4,5,6,7-tetrahydrobenzothiazole of formula (I);and if desired converting (S)-(−)-2-Amino-6-(propylamino)-4,5,6,7-tetrahydrobenzothiazole to its pharmaceutically acceptable salts or solvates.

The invention provides an antique paint and a manufacturing technique thereof, relating to the field of paints. The antique paint is composed of the following components in parts by weight: 5-25 parts of epoxy resin, 2-6 parts of phthalic anhydride, 10-15 parts of polyacrylamide, 8-20 parts of isopropanol, 4-10 parts of titanium white, 2-5 parts of nano silver oxide, 0.1-0.4 part of sodium soap, 5-8 parts of light calcium carbonate powder, 3-5 parts of kaolin, 0.7-2 parts of coupling agent, 0.5-6 parts of dispersing agent, 4-8 parts of defoaming agent, 3-10 parts of anti-settling agent, 3-8 parts of thickener, 1-3 parts of pigment, 5-25 parts of thinner, 5-15 parts of metal powder, 5-8 parts of alkyd resin and 55-75 parts of turpentine. The coated antique paint provided by the invention has the advantages of low cracking tendency, favorable glossiness and favorable decorative effect.

The invention discloses a polyamic solution composition and a polyimide film. The present invention pertains to a polyimide film comprising mainly a polyimide obtained by polymerizing a tetracarboxylic acid component and a diamine component, wherein the tetracarboxylic acid component consists of one or more phthalic anhydride structure-free tetracarboxylic dianhydrides (a1) in which at least one of the bonds connecting the two cyclic acid anhydride structures in the molecule is a freely rotatable bond, and one or more tetracarboxylic dianhydrides (a2) with no freely rotatable bonds in the molecule having an alicyclic structure and the two cyclic acid anhydride structures sharing at least one carbon-carbon bond with an alicyclic structure, and the diamine component includes 5-50 mol% of oneor more diamines having a 9,9-diphenylfluorene structure.

The invention provides an analysis method for polyether polyol hydroxyl value, which comprises the following steps: A, weighing a polyether polyol test sample m into a conical flask, and taking another empty conical flask; B, transferring a phthalic anhydride pyridine solution into the test sample accommodated conical flask and the empty conical flask respectively, placing the two conical flasks in an oscillation oil bath pan, and connecting the two conical flasks with an air condensation pipe for reaction; C, after reaction, taking the two conical flasks out of the oil bath pan for cooling; D, flushing the two conical flasks with deionized water and acetone in sequence, and oscillating the two conical flasks to mix the solutions completely; E, adding a sodium hydroxide aqueous solution into the two conical flasks respectively, and adding a few drops of phenolphthalein indicator; F, titrating the solutions in the two conical flasks with potassium hydroxide standard solution until the solutions in the two conical flasks changes into pink; and G, calculating out the polyether polyol hydroxyl value as per a formula. The method is simple in analysis procedure, has high precision and accuracy, can efficiently shorten detection period, lower experimental cost, and bring certain economical benefits to an enterprise.

A method of manufacture of a bis(phthalimide) composition includes reacting, in the presence of a solvent and a catalytically active amount of an imidization catalyst selected from quaternary ammonium salts, quaternary phosphonium salts, and combinations thereof, a substituted phthalic anhydride with an organic diamine, wherein conversion to the bis(phthalimide) is 99% complete in less than 6 hours.