369 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.

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.

An article comprises a solvent cast film comprising a polyetherimide comprising structural units derived from a dianhydride component selected from the group consisting of 3,4′-oxydiphthalic anhydride, 3,3′-oxydiphthalic anhydride, 4,4′-oxydiphthalic anhydride, and combinations thereof, and a diamine component. The polyetherimide has a glass transition temperature that is at least 190° C. The film has a coefficient of thermal expansion of less than 60 ppm / ° C., a thickness from 0.1 to 250 micrometers, and less than 5% residual solvent by weight. The film has less than 15 molar % of a member selected from the group consisting of biphenyltetracarboxylic acid, dianhydrides of biphenyltetracarboxylic acid, esters of biphenyltetracarboxylic acid, and combinations thereof.

Addition-cured polyimides that contain the reaction product of an aromatic triamine or trianhydride analogue thereof, a reactive end group such as 5-norbornene-2, 3-dicarboxylic acid, ester derivatives of 5-norbornene-2,3-dicarboxylic acid, anhydride derivatives of 5-norbornene-2,3-dicarboxylic acid, or 4-phenylethynylphthalic anhydride, an aromatic diamine, and a dialkyl ester of an aromatic tetracarboxylic acid. The resultant starlike polyimides exhibit lower melt flow viscosity than its linear counterparts, providing for improved processability of the polyimide. Also disclosed are methods for the synthesis of these polyimides as well as composite structures formed using these polyimides.

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.

This invention relates to the vapor-phase oxidation of hydrocarbons by passing a gaseous mixture comprising of a molecular oxygen-containing gas and hydrocarbons which may contain substituents to a fixed bed of catalyst and provides a process for vapor-phase oxidation to be effected by passing a gaseous mixture of raw materials to a fixed bed of catalyst in which the void ratio of the catalyst layers increases by stages in one step or more from upstream downward in the flow of the gaseous mixture of raw materials. For example, the process can oxidize in vapor phase such hydrocarbons as naphthalene, xylene, benzene, toluene, durene, butene, acenaphthene, anthracene, indene and their derivatives in high yields with high productivity. Moreover, the process can prepare phthalic anhydride in high yields with high productivity by the vapor-phase oxidation of naphthalene or ortho-xylene.

The present invention relates to catalyst, and is especially one kind of catalyst for propylene polymerization and its preparation process. The catalyst materials include MgCl2, solvent oil, isooctanol, titanate, acid anhydride, TiCl4, diisobutyl phthalate, toluene and hexane in certain molar proportion. The preparation process of the catalyst includes the following steps: 1. adding anhydrous MgCl2, No. 200 solvent oil and isooctanol into reaction bottle; stirring and heating; and adding tetrabutyl titanate and phthalic anhydride to prepare homogeneous solution; and 2. dropping the solution into glass reactor holding mixture of TiCl4 and refined toluene and adding diisobutyl phthalate.

The present invention relates to a clean esterification method for producing dialkyl phthalate. It is characterized by that it adopts the ionic liquid formed from sulfonic acid group functionalized alkyl pyridine cation or sulfonic acid group functionalized 1,3-dialkyl iminazol cation or 2-oxopyrrolidine cation and organic or inorganic anion X as catalyst of reaction and reaction medium; at normal pressure its reaction temperature is 90-130deg.C and reaction time is 1-2hr, it can catalyze the esterification reaction of phthalic anhydride and isooctanol or n-octanol so as to obtain the invented dialkyl phthalate.

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 invention discloses a specific fluorescent probe for identifying hydrazine and an application thereof, belonging to the field of fine chemical engineering. The fluorescent probe is a 4-trifluoromethyl-7-aminocoumarin derivative, and is prepared by steps of putting 4-trifluoromethyl-7-aminocoumarin, phthalic anhydride and sodium acetate into a reaction bottle in proportion, and performing backflow by adding acetic acid. The fluorescent probe and the corresponding hydrazine content detection process cannot be interfered by biological system matrixes and impurities, so the fluorescent probe can be used for quantitative measurement of the hydrazine content in various biological systems. The probe has high specificity, and can be subjected to hydrolysis after specifically reacting with hydrazine; a hydrolysate has good fluorescence characteristics. Raw materials are cheap and easily available, can be obtained through chemical synthesis, and synthesis process is simple and feasible; the probe has high sensitivity, is suitable for detecting the hydrazine content in cells, and can be used for measuring the hydrazine content by drawing a standard curve. The probe is a ratio type probe, and effectively avoids the influences of non-uniform probe distribution, environmental factors, actuators and the like on the measurement results.

A phthalocyanin-iron-cobalt-ammonium sulfonate as the dsulfurizing catalyst with high catalytic activity and desulfurizing efficiency (more than 99%) is prepared through preparing the sulfonated chemical from phthalic anhydride as raw material and smoking sulfuric acid as sulfonating agent, preparing phthalocyanin-iron-cobalt- ammonium sulfonate from said sulfonated chemical, ammonium molybdate as catalyst, urea, cobalt chloride and iron salt, drying, and pulverizing.

The invention belongs to the technical field of immobilized N-hydroxyphthalimide catalysts, and specifically relates to a preparation method of polymeric-microsphere-carrier immobilized N-hydroxyphthalimide catalyst. The preparation method is characterized in that intermediate product aldehyde group modified microsphere GMA / MMA-AL, modified microsphere GMA / MMA-PA bonded with a phthalic acid group and microsphere GMA / MMA-PPA loaded with phthalic anhydride PPA are prepared, and finally a functional microsphere loaded with N-hydroxyphthalimide functional microsphere group is obtained. With the preparation method provided by the invention, the efficient organic catalyst N-hydroxyphthalimide (NHPI) is easy to separate and can be reused, a system is easy to purity, and therefore, environment-friendly catalytic oxidation is realized.

The invention discloses a heat-resistant single-component moisture-curing polyurethane adhesive and a preparation method and application thereof. The preparation method comprises the following step: carrying out esterification reaction on castor oil, phthalic anhydride and dihydric alcohol at first to prepare a castor oil modified polyester polyol with the functionality of 2.0-2.5 and containing abenzene ring aromatic structure and a long fatty acid molecular segment. When partially substituted polyols are used for modification of polyurethane, rigid benzene rings can be introduced into a soft segment. Distribution of microcrystals in the soft segment structure is controlled, so that the flexibility of an adhesive layer is enhanced; the cohesive strength is increased, and the heat resistance is improved; meanwhile, the modified castor oil polyester polyol can effectively control the crosslinking degree of the polymer and prevent the drastic reduction of performance of an adhesive or coagulation caused by excessive crosslinking degree. The castor oil modified polyester polyol is used for modifying polyurethane, so that the adhesive property and the heat resistance of the adhesive can be obviously improved. The adhesion problem of cracking at an adhesion position of wood during high-temperature baking processes such as wood drying and bent plate making in a wood processing process is solved.

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.

The present invention provides a method for preparing relatively insoluble bisimides under conditions which afford high imidization reaction rates and which permit the monitoring and adjustment of reactant stoichiometry at any stage of the reaction. The bisimides provided by the present invention are prepared either by reaction of a diamine such as 4,4′-diaminodiphenylsulfone (DDS) with an anhydride, for example 3-chlorophthalic anhydride (3-ClPA) in the presence of a solvent at a pressure greater than one atmosphere and at a temperature above the normal boiling point of the solvent, or by reaction of a monoamine with a dianhydride under the same conditions. In one embodiment, the relatively insoluble product bisimides provided by the present invention have a solubility in ortho-dichlorobenzene of less than about 10 percent by weight at a temperature of about 180° C.

The present invention discloses one kind of catalyst for hydroxylating benzene to synthesize phenol and its application method. The catalyst with molecular sieve as carrier is prepared through soaking the carrier to support salt of transition metal, roasting, mixing with phthalic anhydride, urea and ammonium molybdenate, and in-situ solid phase synthesis. It is used in the oxidation of benzene dissolved in solvent comprising acetic acid and water with oxygen as oxidant in the presence of reductant ascorbic acid to synthesize phenol. The catalyst of the present invention has no loss of active components, easy separation from the reaction system, mild reaction condition, high yield of target product phenol and other advantages.

The invention discloses a series of 11-replaced oxoisoaporphine derivatives as well as a synthetic method and an application thereof. The synthetic method comprises the following steps: (1) carrying out ring closing reaction on 3-chlorophthalic anhydride and phenylethylamine as raw materials so as to construct a 10-Cl-1-azabenzanthrone parent body; (2) nitrating the parent body compound so as to obtain a 11-site nitrated product, and reducing the 11-site nitrated product so as to obtain 11-amino-10-chlorine-7H-dibenzoquinoline-7-ketone; and (3) reacting the 11-amino-10-chlorine-7H-dibenzoquinoline-7-ketone with an acyl chloride compound connected with piperidine so as to obtain a corresponding target product. Through study, the applicant finds that the series of derivatives have very strong inhibitory activity on acetylcholin esterase and are expected to be used for treating AD (Alzheimer Disease), cerebrovascular dementia and related diseases caused by cholinergic neurotransmitter reduction. The structural formula of the 11-replaced oxoisoaporphine derivatives is shown in descriptions.

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.

A poly(imide-amide) copolymer includes: an imide structural unit which is a reaction product of a first diamine and a dianhydride, and an amide structural unit which is a reaction product of a second diamine and a diacyl halide, wherein each of the first diamine and the second diamine includes 2,2'-bis-trifluoromethyl-4,4'-biphenyldiamine, and at least one of the first diamine and the second diamine further includes a compound represented by Chemical Formula 1, wherein the dianhydride includes 3,3',4,4-biphenyltetracarboxylic dianhydride and 4,4'-hexafluoroisopropylidene diphthalic anhydride, wherein the diacyl halide includes terephthaloyl chloride (TPCI), and wherein an amount of the compound represented by Chemical Formula 1 is less than or equal to about 10 mole percent based on the total amount of the first diamine and the second diamine: NH2-A-NH2 Chemical Formula 1, wherein in Chemical Formula 1, A is the same as described in the detailed description.

The present invention relates to a natural plant type coating and its preparation method. Said coating is formed from high-molecular film-forming material, pigment, adjuvant and solvent. It is characterized by that the oil material adopted in the high-molecular film-forming material contains 30-40 portions of linseed oil, 35-45 portions of limonene, 5-15 portions of polybasic alcohol, the polybasic acid contains 8-15 portions of phthalic anhydride and 2-5 portions of trimellitic anhydride, the adjuvant is 0.02-0.1 portion of catalyst lithium hydroxide, the dryer is 1-3 portions of composite rare earth, and the solvent contains 5-10 portions of pine cone oil and 5-10 portions of terpineol, the above-mentioned raw materials are mixed to obtain the invented film-forming material. Besides, it adopts deionized water, adds 18-35 portions of pigment titanium dioxide, adds drying, dispersing, anti-freezing, defoaming, anti-corrosion and film-forming adjuvants, and adds medicinal talcum powder and natural calcium carbonate and stirs them to obtain slurry material for stand-by, then said invention utilizes 10-20 portions of film-forming material to make emulsification, adds deionized water and the above-mentioned slurry material, and adds thickening agent, mixes them so s to obtain the invented coating.

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 polyester-polyol being liquid at 40° C. and having a viscosity of not more than 10,000 mPa.s at 60° C., prepared by polycondensation of an acid component including at least one phthalic acid component selected from phthalic anhydride and o-phthalic acid, and an aliphatic polybasic acid, with a polyhydric alcohol; a process for preparing a polyurethane foam including reacting a polyisocyanate component with a polyol component including the polyester-polyol; a process for preparing an isocyanate prepolymer from a polyisocyanate component and a polyol component including the polyester-polyol; and a process for preparing a polyurethane foam including reacting an isocyanate prepolymer prepared from a polyisocyanate component and a polyol component including the polyester-polyol, with a polyol component. The resulting polyurethane foam shows remarkably improved physical properties such as tensile strength and tear strength, while having low density, acceptable appearance and texture.

The invention provides a new preparation method of L-alanyl-L-glutamine. The new preparation method comprises the following steps of: reacting phthalic anhydride with L-alanyl so as to prepare phthalic anhydride-L-alanyl, and acylating and halogenating the phthalic anhydride-L-alanyl with a halogenated reagent so as to synthesize phthalic anhydride-L-alanyl halogen; carrying out esterification reaction on L-glutamic acid and alcohol under the action of acid catalysis to obtain L-glutamic acid monoester; condensing the L-glutamic acid monoester and the phthalic anhydride-L-alanyl halogen under the action of alkali to obtain phthalic anhydride-L-alanyl-L-glutamic acid monoester which is an important intermediate for synthesizing the L-alanyl-L-glutamine; adding the phthalic anhydride-L-alanyl-L-glutamic acid monoester to ammonium hydroxide for ammonolysis and deprotection, and finally crystallizing in alcohol to obtain L-alanyl-L-glutamine. The new preparation method has the advantages that reaction raw materials are easily available, L-glutamic acid and L-alanyl are low in price, the product purity and the product yield are high, the production cost can be effectively reduced, and large-scale production is realized.

The invention belongs to the technical field of coating resin, and in particular relates to a fast-drying alkyd resin used for wood lacquers, and a preparation method thereof. The fast-drying alkyd resin used for wood lacquers comprises the following components, by weight: 17-21 parts of vegetable oil acid, l 4-9 parts of ethylene glycol, 9-18 parts of pentaerythritol, 21-30 parts of phthalic anhydride, 0.6-1.3 parts of maleic anhydride, 2-7 parts of benzoic acid, 3-9 parts of a chain extender, 0.04-0.09 parts of an antioxidative color-reducing agent, and 23-39 parts of a letdown solvent. According to the invention, the alkyd resin has a large molecular weight, relatively few free hydroxyl groups, and an overall uniform molecular weight distribution, so the fast-drying alkyd resin used for wood lacquers of the present invention has characteristics of fast drying, good transparency, good polishing property, and a high performance cost ratio.

The invention mainly relates to a method for preparing a chitosan oligosaccharide modified biodegradable composite. The method comprises the steps of: firstly, with N,N-dimethyl formamide as a solvent, protecting amino of chitosan oligosaccharide by using phthalic anhydride to prepare a N-methyl o-acyl chitosan oligosaccharide reaction intermediate; secondly, dropwise adding pyridine solution of stannous octoate under protection of nitrogen, initiating an epsilon-caprolactone monomer to carry out ring opening polymerization so that polycaprolactone is grafted on hydroxyl of N-methyl o-acyl chitosan oligosaccharide, so as to generate a chitooligo saccharide-grafted polycaprolactone thermoplastic material; and finally melting and blending LDPE (low-density polyethylene), chitooligo saccharide-grafted caprolactone and polycaprolactone to prepare the biodegradable composite. The blended composite has biological degradability, and is free of poison and wide in application range; deterioration of an ecological environment is effectively improved; and the situations of energy crisis and petroleum resource shortage are solved.