43 results about "Terephthaloyl dichloride" patented technology

A poly(amide-imide) copolymer film having a tensile modulus of greater than or equal to 5.4 GPa, and a yellowness index of less than or equal to 3.6, wherein the poly(amide-imide) copolymer film is a reaction product of an aromatic dianhydride including biphenyl tetracarboxylic dianhydride and 4,4′-hexafluoroisopropylidene diphthalic dianhydride, an aliphatic dianhydride including 1,2,3,4-cyclobutane tetracarboxylic dianhydride, an aromatic diamine including 2,2-bis(trifluoromethyl) benzidine, and an aromatic dicarbonyl compound including terephthaloyl dichloride.

The invention belongs to the technical field of polymer synthesis and particularly relates to a preparation method of block polyether ketone ketone. The preparation method comprises the following steps of adding a solvent, lewis acid and lewis base in two prepolymerization reaction bottles respectively; and then respectively adding diphenyl ether and isophthaloyl/terephthaloyl dichloride with an equal molar ratio for reaction to produce a prepolymer A and a prepolymer B with better mobility, then adding the produced prepolymer A and prepolymer B in a polymerization reaction bottle for reaction, and performing mashing, washing and drying to prepare the block polyether ketone ketone. The preparation method is simple in technology and low in cost; and the prepared polyether ketone ketone hashigher degree of crystallinity and rapider crystallization rate.

Disclosed is a high-strength copolymerized aramid fiber which includes aramid copolymers containing an aromatic group substituted with a cyano group (—CN), so as to have an intrinsic viscosity (IV) of 6.0 to 8.5, a polydispersity index (PDI) of 1.5 to 2.0, a strength of 23 to 32 g/d, and an elastic modulus of 1,100 to 1,300 g/d. The high-strength copolymerized aramid fiber may be prepared by a method which includes, when para-phenylenediamine, cyano-para-phenylenediamine, and terephthaloyl dichloride are sequentially added to an organic solvent and reacted together to prepare a copolymerized aramid fiber, adding and dispersing a neutralizing agent in the organic solvent before the reaction of the para-phenylenediamine, cyano-para-phenylenediamine and terephthaloyl dichloride, which were dissolved in the organic solvent.

A solvent resistant, transparent aromatic polyamide film with a high refractive index may be made by reacting at least one aromatic diacid chloride, a first aromatic diamine, and at least one crosslinking agent or a second aromatic diamine in an organic solvent to form an aromatic polyamide polymer in solution. In one embodiment, the at least one aromatic diacid chloride is selected from the group consisting of isophthaloyl dichloride, terephthaloyl dichloride, 2,6-naphthalene-dicarboxylic chloride, or combinations thereof and the first aromatic diamine is selected from the group consisting of 9,9-Bis(4-hydroxyphenyl)fluorine, 2,2′,5,5′-Tetrachlorobenzidine, or combinations thereof. The organic solvent is then evaporated from the aromatic polyamide polymer in solution to form a transparent aromatic polyamide precursor film. The precursor film is then heated at a temperature close to the glass transition temperature of the transparent aromatic polyamide precursor film to form the solvent resistant, transparent aromatic polyamide film.

The invention concerns polymer comprising residues of 2-(4-amino phenyl)-5 (6) amino phenyl benzimidazole (DAPBI), paraphenylene diamine, and terephthaloyl dichloride, the polymer having a IPC peak block ratio of 1.45 to 1.47 and an inherent viscosity of greater than 2 dl/g.

The invention concerns processes for forming a polymer comprising residues of 2-(4-amino phenyl)-5 (6) amino phenyl benzimidazole (DAPBI), paraphenylene diamine (PPD), and terephthaloyl dichloride, comprising the steps of: (a) forming a solution of oligomers having amine end groups from two moles of DAPBI and one mole of terephthaloyl dichloride in a solvent system comprising an organic solvent and an inorganic salt; (b) adding PPD to the solution of oligomers; and (c) adding additional terephthaloyl dichloride to form a polymer.

The invention discloses a preparation method of cyclic tetrapolybutylene terephthalate. The method comprises the steps as follows: a) an initial material, namely, terephthaloyl dichloride, reacts with1,4-butanediol under the action of an alkaline reagent, and terephthalic bis(4-hydroxyl-butyl)ester, namely, a compound I, is obtained; b) the compound I reacts with monobenzyl terephthalate under the action of a condensing agent, and bis(4-(4-benzyloxy terephthaloyl)butyl)terephthalate, namely, a compound II, is obtained; c) the compound II is dissolved in a proper solvent, a catalyst is added to reduce debenzylation under the action of palladium-carbon and hydrogen, and 4,4'-[terephthaloyl bis(oxytetramethylene oxycarbonyl)]dibenzoic acid, namely a compound III, is obtained; d) the compoundIII reacts with the compound I under the action of a condensing agent, and the target product, namely, cyclic tetrapolybutylene terephthalate, is obtained. The method is low in cost, short in synthesis route, convenient to operate, high in product quality and good in industrial application value.

The invention provides a continuous production method of para-aramid precipitation fiber. A p-phenylenediamine solution and a terephthaloyl dichloride melt are polymerized in a double-screw reactor, aproduct is mixed with a pre-coagulation agent, and pre-precipitation is performed; an obtained aramid product and a coagulating bath are precipitated in a mixing pump to form fiber, and the para-aramid precipitation fiber is obtained, wherein the pre-coagulation agent comprises a first solvent, a second solvent and an aid; the length-diameter ratio of the twin-screw reactor is (30:1)-(60:1), therotating speed is 60-500 rpm, and a discharging port at the tail end of the screws is kept at 70 DEG C or below; a first adding port and a second adding port are formed in the twin-screw reactor; thefirst adding port is located in the initial position of screws; the p-phenylenediamine solution and the terephthaloyl dichloride melt are added via the first adding port; the second adding port is located in the 1/2-6/7 position of the screws in the discharging direction; the pre-coagulation agent is added via the second adding port. The method comprises a simple technological process, equipment selection is reasonable, the method is accurate and controllable, and the product structure is easy to adjust. The fiber is on the micrometer-millimeter scale.

The present invention concerns yarns comprising copolymer derived from the copolymerization of para-phenylenediamine, 5(6)-amino-2-(p-aminophenyl) benzimidazole; and terephthaloyl dichloride wherein the ratio of moles of 5(6)-amino-2-(p-aminophenyl) benzimidazole to the moles of para-phenylenediamine is 30/70 to 85/15; the yarn having a sulfur content greater than 0.1%; and the hydrolytic strength retention of the yarn is greater than 60%. The invention also concerns processes for making such yarns.

The invention concerns processes for forming a polymer comprising residues of 2-(4-amino phenyl)-5 (6) amino phenyl benzimidazole (DAPBI), paraphenylene diamine, and terephthaloyl dichloride, the process comprising: (a) forming a solution of oligomers having chloride end groups from one mole of paraphenylene diamine and 1.3 to 5 moles of terephthaloyl dichloride a solvent system comprising an organic solvent and an inorganic salt; and (b) adding DAPBI and terephthaloyl dichloride to the solution of oligomers to form a polymer.

The invention concerns polymer comprising 2-(4-amino phenyl)-5 (6) amino phenyl benzimidazole (DAPBI), PPD, and terephthaloyl dichloride, the polymer having an IPC peak block ratio of 1.52 to 1.56 and an inherent viscosity of greater than 2 dl/g.

The invention concerns polymer comprising residues of 2-(4-amino phenyl)-5 (6) amino phenyl benzimidazole (DAPBI), paraphenylene diamine (PPD), and terephthaloyl dichloride, made by a process comprising the steps of: (a) forming a slurry of b mole percent DAPBI and y mole percent PPD in a solvent system comprising organic solvent and c weight percent of an inorganic salt, wherein the inorganic salt is present in an amount of at least 5 weight percent of the organic solvent, DAPBI and PPD being present in an amount sufficient for providing a polymer solution having a weight percent solids of 12 percent or greater on a polymer basis; and (b) contacting the slurry of step a) with a stoichiometric amount of terephthaloyl dichloride to form a product comprising the polymer; wherein the sum of y + b is 100 and the product of b x c is 225 or greater.

The invention concerns processes for forming a polymer comprising residues of 2-(4-amino phenyl)-5 (6) amino phenyl benzimidazole (DAPBI), paraphenylene diamine, and terephthaloyl dichloride, comprising the steps of: (a) forming a slurry of DAPBI and paraphenylene diamine in a solvent system comprising an organic solvent and an inorganic salt; and (b) adding a stoichiometric amount of terephthaloyl dichloride to the slurry in a single addition and allowing the formation of the polymer.