Showing papers on "Terephthalic acid published in 1980"

Polyarylate containing blends

Abstract: Described herein are molding compositions comprising a blend of (a) a polyarylate derived from a dihydric phenol and a mixture of isophthalic acid and terephthalic acid, of which more than about 65 mole percent is terephthalic acid, (b) a polyarylate derived from a dihydric phenol and a mixture of terephthalic acid and isophthalic acid, of which more than about 70 mole percent is isophthalic acid, and (c) at least one thermoplastic polymer compatible therewith An article molded from these compositions has a good balance of mechanical properties and improved environmental stress crack resistance

Synthesis of poly(ester carbonate) copolymers

Abstract: The synthesis of poly(ester carbonate) copolymers based on bisphenol A, terephthalic acid, and phosgene is reviewed, and a new synthetic route is described leading to polymers which are different from those obtained by methods described in the literature The most important features of the new method are quantitative incorporation of the dicarboxylic acid into the polymer and absence of undersirable side reactions Synthesis of the random copolymer in which the dicarboxylic acid and carbonic acid groups are present in about equal molar amounts is discussed Solution properties, effects of Mn and copolymer composition on Tg, sequence length distribution, the effect of ester interchange reactions on molecular weight distribution, and effects of monofunctional chain termination on molecular weight of the final product are also discussed

Process for the production and the recovery of terephthalic acid

Abstract: The reaction mixture obtained by oxidizing p-xylene in the presence of water as diluent, at a temperature comprised between 140° and 220° C., and consisting of terephthalic acid crystals in suspension in an aqueous solution comprising unreacted p-xylene, intermediate oxidation products thereof, the heavy-metal catalyst and water is introduced in the upper part of a sedimentation column wherein the acid is separated by gravity and is washed with a counter current of water introduced near the bottom of said column, the temperature of the washing zone being higher than the minimum value T w given by the equation T w =144+0.225 T R , wherein T R is the oxidation temperature.

High-molecular weight linear polyesters and a process for preparing them

Abstract: High molecular weight linear polyesters advantageous for use as hot melt adhesives and powder coating agents, are prepared by a process for preparing a high-molecular weight, linear copolyester by condensing 40-85 molar percent of terephthalic acid optionally in the form of a dialkyl ester, half of which component can optionally be replaced by another dicarboxylic acid also optionally in the dialkyl ester form, and 60-15 molar percent of adipic acid, with an alkanediol of 2-6 carbon atoms in its carbon chain, at an elevated temperature in the presence of a conventional catalyst, in a first condenstation stage which is an interesterification or esterification stage and a second condenstation stage which is a polycondensation stage, whereby a copolyester melt is produce. The process comprises, before or during the first condensation stage, adding 0.005-01 molar percent, based on the total acid component, of a C6 - aryl or C7 - alkaryl ester of phosphorous acid or of phosphoric acid to the reaction mixture; and, after termination of the second condensation stage, adding 0.01-0.2 molar percent, based on the total acid component, of hypophosphorous acid to the finished copolyester melt.

Process for the production of an aromatic dicarboxylic acid

Abstract: A substituted aromatic compound e.g. p-xylene is oxidized to an aromatic dicarboxylic acid e.g. terephthalic acid using a Co/Mn/Br catalyst in acetic acid and the slurry product is purified by treating with molecular oxygen and diluting with fresh acetic acid before separation of the terephthalic acid and mother liquor.

Aqueous copolyester dispersions suited for the subbing of polyester film, subbed polyester film and photographic materials containing a subbed polyester base

Abstract: An aqueous copolyester dispersion suitable for the subbing of polyesterfilm without the use of solvents, is characterized in that the copolyester essentially consists of recurring ester groups derived from ethylene glycol and a mixture of terephthalic acid, isophthalic acid and sulphoisophthalic acid whose sulpho group is in salt form, the said acid mixture containing from 20 to 60 mole %of isophthalic acid and from 6 to 10 mole % of said sulphoisophthalic acid, the remainder being terephthalic acid, the copolyester having a glass transition temperature above 45°C and an intrinsic viscosity of from 0.15 to 0.45 dl/g when measured at 25°C in a mixture of phenol/o-dichlorobenzene (60/40 by volume). The sulpho- salt group of the sulphoisophthalic acid may be an alkali metal or onium salt. The aqueous dispersion may be coated onto the polyester film before longitudinal stretching thereof.

Catalytic process for preparation of polyesters

Abstract: Using an alkanolamine titanium chelate catalyst, such as triethanolamine titanium chelate, in small catalytic amounts to esterify and polycondense aromatic polycarboxylic acids or anhydrides, such as terephthalic acid, with a glycol, such as ethylene glycol at low glycol to acid reactant ratios surprisingly yields a polyester of low diethylene glycol content without adding an additional diethylene glycol suppressant.

High‐molecular‐weight polyterephthalamide by direct polycondensation reaction in the presence of poly(ethylene oxide)

Abstract: Polyterephthalamides of high molecular weight (ηinh up to 1.9) were obtained by the direct polycondensation reaction of terephthalic acid and aromatic diamines in the presence of poly(ethylene oxide) (PEO) with triphenyl phosphite in a N-methylpyrrolidone (NMP)–pyridine solution that contained lithium chloride. The molecular weights of the polymers produced varied with the amount and molecular weight of PEO, which showed maximum values when PEO with a molecular weight of 2.0 × 104−5.0 × 105 was used in a concentration of about 0.5 wt % in the solvent. The polycondensation reaction was significantly affected by the level of pyridine in a mixed solvent of NMP and pyridine and by the concentration of the lithium chloride added.

Process for the recovery of the solvent and of the by-produced methylacetate in the synthesis of terephthalic acid

Abstract: The invention refers to an improved process for the recovery of the solvent and of the by-produced methylacetate in the synthesis of terephthalic acid, said synthesis being usually consisting of an oxidation of paraxylene with air, in the presence of a catalyst system composed by cobalt, manganese and bromine, in a solvent consisting of acetic acid, according to the equation (1): C.sub.6 H.sub.4 (CH.sub.3).sub.2 +3 O.sub.2 →C.sub.6 H.sub.4 (COOH) 2 =2 H 2 O (1) More particularly, the improved process of this invention comprises the oxidation of para-xylene in acetic acid solution and in the presence of a catalytic system based on manganese, bromine and cobalt, whereby water is formed and methylacetate is by-produced during the oxidation, whereby solid terephthalic acid is separated from the mother liquor and whereby one withdraws from the oxidation zone a liquid which is obtained by condensing the vapors released during the oxidation and which are mainly consisting of acetic acid and water, the improvement consisting of the fact that: (a) the liquid obtained by condensing the released vapors and said mother liquor are fed both to an azeotropic distillation system in which the azeotropic agent is isobutyl-acetate; (b) the light ends of the azeotropic distillation, richer in water, are condensed and demixed into two phases, wherein the aqueous phase, which is lower and contains isobutyl-acetate and methyl-acetate, is conveyed to a stripping, whereby isobutyl-acetate and methyl-acetate are recovered, and wherein the organic phase is recycled to the azeotropic distillation.

Preparation of polyester

Abstract: PURPOSE:To obtain polyesters of uniform polymerization degree, by melt-polycondensation of glycol esters of bifunctional carboxylic acids, etc., and after cooling and granulation, maintaining a specified temperature and water content before solid- phase polycondensation. CONSTITUTION:Glycol esters of bifunctional carboxylic acids, mainly composed of terephthalic acid, and/or their low polymers, are melt-polycondensed at their melting point or higher temp., discharged, cooled and granulated. Then, the obtained granules are kept at a temp. <=70 deg.C and their water content is maintained at 0.08wt% or lower, before they are polycondensed in solid phase. The granules maintained at such specified conditions are polymerized in solid phase by heating them at their melting point or lower temp, under reduced pressures or in an inert gas stream, to obtain purpose polyester.

Optical fiber for transmission

Abstract: PURPOSE:To obtain an optical fiber cable with superior transmission characteristics, superior mechanical strength and high endurance by using a mixture of polyamide of >=10C omega-aminocarboxylic acid and specified polyether ester amide as a coating material for an optical fiber. CONSTITUTION:A mixture of polyamide (component I) of >=10C omega-aminocarboxylic acid or lactam such as polyaurin lactam and polyether ester amide (component II) produced from omega-aminocarboxylic acid or lactam, alpha,omega-dihydroxy-polytetrahydrofuran with with 160-3,000mol.wt. and about 4-30C dicarboxylic acid such as dodecanedicarboxylic acid or terephthalic acid is used as a coating material. 5-80% Component I and 95-20% component II are mixed, and using the mixture a 100-500mu coat can be formed on an optical fiber core strand of <=200mu diameter with high efficiency. An increase in transmission loss due to forming strain and an increase in transmission loss due to temp. (-50-+30 deg.C) can be prevented.

Polyester resin compositions

Abstract: This invention involves a curable molding composition comprising a mixture of (a) a polyester of the following formula: ##STR1## wherein n has an average value between about 1.5 and 2, m is 2-n, R is the hydroxyl-free residue of a predominantly hydroxyl terminated polyester having a molecular weight not exceeding about 1500 and obtained by the condensation of a diol selected from the class consisting of 1,2-propylene glycol, 1,3-butanediol, 2,2-dimethyl-1,3-propanediol, dipropylene glycol, diethylene glycol, 2,2-dimethyl-3-hydroxypropyl 2,2-dimethyl-3-hydroxypropionate, the ethylene and propylene oxide derivatives of 2,2-bis(4-hydroxyphenyl)propane, and mixtures thereof, and mixtures of ethylene glycol and said diols, with a dicarboxylic acid or anhydride selected from the class consisting of maleic and anhdride, fumaric acid, ortho-phthalic acid and anhydride, isophthalic acid, terephthalic acid, carbic acid and anhydride, and mixtures thereof, (b) maleic anhydride, (c) an ethylenically unsaturated monomer which forms a homogeneous mixture with and is copolymerizable with (a) and (b), and (d) one or more reinforcing fibers having a melting point or a glass transition temperature above about 130° C.

Extrusion blow moldable copolyesters

Abstract: Disclosed are copolyesters which are capable of being extrusion blow molded into a variety of shapes such as, for example, bottles, films or the like. The copolyesters are derived from an acid component comprising terephthalic acid and 1,12-dodecanedioic acid, and a glycol component comprising 1,4-cyclohexanedimethanol.

Production of polyester

Abstract: PURPOSE: To obtain a polyester, excellent in fiber-producing properties and moldability and suitable as a material such as fiber by using a specific amount of a pentaerythritol diphosphite in obtaining the polyester using an organotitanium compound as an ester interchange catalyst. CONSTITUTION: An organotitanium compound (e.g. tetrabutyl titanate) is used as an ester interchange catalyst to provide a polyester from an acid component (e.g. terephthalic acid) and a glycol component (e.g. ethylene glycol) by an ester interchange method. In the process, a pentaerythritol diphosphite [preferably pentaerythritol diphosphite di(2,6-di-tert.-4-methylphenyl) ester, pentaerythritol diphosphite di(2,4-di-tert.-butylphenyl) ester, etc.] in a molar amount of 1.5 to 10 times, preferably 2 to 6 times based on the abovementioned organotitanium compound is added thereto at the time of preferably completing the ester interchange reaction. thereby, activity of the aforementioned organotitanium compound is suppressed to afford a polyester suitable for high speed spinning, etc. COPYRIGHT: (C)1990,JPO&Japio

Process for producing terephthalic acid with high purity

Abstract: Terephthalic acid with a high purity and high whiteness is produced by oxidizing p-tolualdehyde with molecular oxygen such as air in the presence of a heavy metal catalyst of manganese and/or cerium, a bromine compound, and a mineral acid in water as a solvent at a bromine compound concentration of 0.5-12% by weight on the basis of the reaction solution in terms of bromine ions and at a ratio of g-equivalents of hydrogen ions of the mineral acid to sum total of g-equivalents of the hydrogen ions and manganese and/or cerium ions of 1-85% and at a ratio of sum total of g-equivalents of the hydrogen ions and manganese and/or cerium ions to g-equivalents of bromine ions of 0.5-5. Terephthalic acid thus produced is directly polymerizable with glycols without any purification.

Heat resistant copolyester adhesives

Abstract: Disclosed are heat-resistant adhesive compositions comprising a copolyester derived from terephthalic acid, from about 30 to about 50 mol % diethylene glycol, and at least 50 mol % ethylene glycol, the polyester having an inherent viscosity of from about 0.4 to about 1.0. The composition is especially useful in bonding parts of ovenable food containers.

Polyamideeimide resin composition

Abstract: PURPOSE:To provide titled compsn having excellent wear resistance, Freon resistance and softening resistance, consisting of a specified polyamide-imide resin and a polyester resin having hydroxyl gp CONSTITUTION:(a) 1-30 equivalent % (based on the amount of total isocyanate equivalents) of an isocyanurate ring-contg polyisocyanate having a residual isocyanate content of 10-70%, is reacted with (b) 30-80 equivalent % (base on the amount of total isocyanate equivalents) of a lactam such as epsilon-caprolactam and (c) an arom diisocyanate such as tolylene diisocyanate in cresol solvent at a temp of 160-190 degC for 1-3hr Then (d) a polycarboxylic acid having acid anhydride gp is added to the reaction mixt in such a proportion as to give a ratio of carboxyl gp and acid anhydride gp to isocyanate gp of 15-07 Further, the reaction is continued at a temp of 200-220 degC for 10-20hr to produce a polyamide-imide resin (A) Then (B) 1-300wt% of a hydroxyl gp-contg polyester resin drived from terephthalic acid and/or isophthalic acid, is blended with the above (A)

Microanalysis of Urinary Electrolytes and Metabolites in Rats Ingesting Dimethyl Terephthalate

Abstract: Quantitative methods are described for the analysis of pH, sodium, ammonium, potassium, calcium, magnesium, chloride, phosphate, and sulfate, as well as terephthalic acid and dimethyl terephthalate, in a single urine sample as small as 20 microliter. The procedure utilizes ion chromatography and atomic absorption for electrolyte analysis, a microelectrode for pH measurement, and high-performance liquid chromatography for analysis of the organic compounds. The techniques are applied to urine samples freshly collected from rats ingesting dietary dimethyl terephthalate. Specific changes in urinary ions, including hypercalciuria and urinary acidosis, are shown to develop as a consequence of dimethyl terephthalate ingestion. The results indicate that metabolism of dimethyl terephthalate to terephthalic acid occurs extensively in Fischer-344 rats, and accounts for the ion changes that are observed.

Process for the purification of terephthalic acid

Abstract: This invention relates to catalysis for example, the catalytic hydrogenation of impurities in terephthalic acid to yield terephthalic acid of sufficient purity for use in the production of polyester fibres. In more detail, the invention comprises the step of treating a solution of terephthalic acid with hydrogen gas in the presence of a catalyst comprising two or more of the metals platinum, palladium, rhodium, ruthenium, osmium and irridium.

Polyester compositions and processes for moulding them

Abstract: Compositions comprising (i) thermoplastic polyester of aliphatic diol and dicarboxylic acid, at least 95 mole percent of said acid being terephthalic acid, (ii) inert particulate nucleating agent (iii) plasticizer and/or oligomeric polyester and (iv) segmented polyester-polyether block copolymer are disclosed as useful moulding compounds. The preferred polyesters include poly (ethylene terephthalate) and the crystallization rate of the polyester component is promoted by components (iii) and or (iv) sothatthe compositions can be moulded to form crystalline products at low temperatures. Moulding processes of the invention are carried out at less than 100°C mould temperature.

Adhesive composition for laminate

Abstract: PURPOSE: The titled electron beam-curing composition capable of giving a bonding layer with excellent flexibility and adhesion, which comprises an ethylenically unsaturated bond-contg. compound and a linear saturated polyester resin. CONSTITUTION: An electron beam-curing adhesive composition for a laminate comprising an ethylenically unsaturated bond-contg. compound such as a polyester (meth) acrylate and 5W60wt%, based on the total composition, linear saturated polyester resin such as one of MW 10,000W30,000, intrinsic viscosity 0.5W1.0 and ≤10°C glass trainsition temp. consisting of a terephthalic acid residue and a polyethylene glycol residue. The adhesive composition essentially contains no solvent and is capable of giving an odorless laminated film from the same or different kinds of films such as paper, plastic or metal, by completely curing by means of electron beam, which is extremely useful as a packaging material for foods, drugs. etc. COPYRIGHT: (C)1982,JPO&Japio

Hot melt adhesive composition

Abstract: Hot melt adhesive compositions having low melt viscosity and high adhesive strength are disclosed. The compositions include polyesters comprising 1,6-hexanediol and terephthalic acid, blended with a polymeric material comprising a vinyl aromatic polymer derived from a monomer of the formula ##STR1## wherein R is hydrogen or an alkyl group containing 1 to 4 carbon atoms and R 1 is hydrogen, chlorine, alkyl from 1 to 4 carbon atoms or phenyl.

Wholly aromatic copolyester resin composition

Abstract: PURPOSE: To provide a composition of improved strength, modulus and heat distortion resistance, small in the anisotropy, good in the appearance of molded article therefrom, comprising wholly aromatic copolyester and potassium titanate fiber with the free potassium content below specific level. CONSTITUTION: The objective composition can be obtained by blending (A) 30W95wt% of a wholly aromatic copolyester of formula (X is 1W4C alkyl, O, SO 2 , S, etc.; m and n are each 0 or 1; d:e=1:1W10:1; e:f=9:10W10:9; the substituents at the aromatic ring being in para or meta state each other) pref. a combination of p-hydroxybenzoic acid (ester), terephthalic acid (ester), and 4,4'-dihydroxydiphenyl (ester) and (B) 70W5wt% of potassium titanate fiber with an average length 5W150 (pref. 10W30)μm, average diameter 0.05W2 (pref. 0.1W0.5)μm, and free potassium content ≤0.25wt% followed by kneading under molten state. COPYRIGHT: (C)1986,JPO&Japio

Transparent copolyamides and their application to transparent, impact resistant molded articles

Abstract: Transparent, high molecular-weight copolyamides having high glass transition temperatures, based on: (1) lactams or omega-aminocarboxylic acids; (2) terephthalic acid, isophthalic acid, esters thereof, ester forming derivatives thereof, or mixtures thereof; and (3) mixtures of diamines; the copolyamide consisting of: (A) about 25 to 60 mole % of at least one omega-aminocarboxylic acid having at least 11 C atoms or its lactams; (B) about 40 to 75 mole % of an equivalent mixture of terephthalic acid, isophthalic acid or a mixture thereof, and a diamine mixture of about 80 to 50 mole % referred to the total diamines, of isophorone diamine and correspondingly about 20 to 50 mole % of diamines of the general formula ##STR1## where R 1 and R 2 are hydrogen atoms or alkyl groups having 1 to 4 C atoms and the sum of A+B amounts to 100 mole %. The copolyamides have utility as transparent, impact resistant molded articles.

Spinning method of polyester fiber

Abstract: PURPOSE: To prevent the occurrence of broken fibers and the reduction in the product strength, by using a polyester, consisting of terephthalic acid component and ethylene glycol component essentially, and having a specific spherulitic diameter CONSTITUTION: In melt spinning a polyester at a taking off speed ≥2,000m/min, a polyester obtained by esterifying a bifunctional carboxylic acid consiting of terephthalic aic essentially and a glycol consisting of ethylene glycol essentially in the presence of a crystallization inhibitor, preferably sodium acetate, and polycondensing the resultant esterification reaction preduct is used as the polyester The polyester has a spherulitic diameter ≤15μm measured by a differential scanning calorimeter COPYRIGHT: (C)1982,JPO&Japio

Thermosetting injection molding material

Abstract: PURPOSE:To prepare a thermosetting injection molding material free from tackiness and having excellent moldability, by compounding a crystalline unsaturated polymer having a specific composition with styrene, an allyl monomer, glass fibers, additives, etc. CONSTITUTION:(A) A resin comprising (a) a crystalline unsaturated polyester derived from the acid component consisting of terephthalic acid and fumaric acid [5/5-1/9 (molar ratio)] and the glycol component consisting of 1, 4-butanediol and other glycols [7/8-10/0 (molar ratio)], and having the Gardner-Holdt bubble viscosity of N-W, a melting point of 50-130 deg.C and an acid value of <=20, and (b) a styrene-type monomer and/or an allyl monomer, is compounded with (B) glass fibers and (C) additives (e.g. fillers, flame retardants), wherein (b)/(A)=5- 40wt%, (B)=5-80wt% and [(B)+(C)]/(A)=90/10-40/60 (weight ratio), to give the flow length in the disc flow test of the material of 80-110mm.

Polyester amide fabric adhesives

Abstract: Disclosed is a hot-melt adhesive composition comprising a polyester amide of from about 50 to about 85 mole % terephthalic acid, from about 15 to about 50 mole % of an aliphatic dicarboxylic acid having from 4 to 12 carbon atoms, about 60 to about 90 mole % of 1,6-hexanediol, and from about 10 to about 40 mole % 1,6-hexanediamine. The polyester amide has a glass transition temperature of from about -15° to about 15° C., a melting point of about 70° to about 140° C., and is useful as a fabric adhesive.

Polyester–polycarbonate blends. VII. Ring‐containing polyesters

Abstract: Thermal analysis was used to show that blends of poly(1,4-cyclohexanedimethylene succinate) (PCDS) with polycarbonate (PC) are completely miscible in the amorphous phase. Blends of PC with poly(ethylene orthophthalate) (PEOP) were found to have a miscibility gap in the midconcentration range and are thus not miscible in all proportions. Similarly, a commercial copolyester formed from ethylene glycol, 1,4-cyclohexanedimethanol, terephthalic acid, and isophthalic acid is partially miscible with PC. These observations are discussed in terms of the structural features of the three polyesters.

Production of high-viscosity modified polyester elastomer

Abstract: PURPOSE: To thicken a polyester elastomer easily and effectively, by melt-mixing N,N',N"-triglycidyl isocyanurate with a specified poly(ether ester) block copolymer elastomer. CONSTITUTION: 0.05W2pts.wt. N,N',N"-triglycidyl isocyanurate (B) is belt-mixed with 100pts.wt. poly(ether ester) block cpolymer elastomer (A) contg. 10W80wt% polyalkylene ether glycol component based on the whole amount of the polymer and produced from a dicarboxylic acid consisting mainly of terephthalic acid (or an ester-forming derivative thereof), a glycol (or an ester-forming derivative thereof) and a polyalkylene ether glycol having an MW of 600W4,000, to obtain the desired elastomer. When a carboxylic acid anhydride (C) together with the isocyanurate (B) is mixed with the elastomer (A), thicknening efect is enhanced. COPYRIGHT: (C)1981,JPO&Japio

Highly selective monomethyl esterification of terephthalic acid by use of monocarboxylate chemisorption on alumina

Abstract: When terephthalic acid, which had been chemisorbed on an alumina surface, was esterified in a stream of diazomethane, monomethyl terephthalate was obtained quantitatively