摘要:
To provide a polyester resin having 1,4-CHDA as the main dicarboxylic acid units, having isomerization of trans-1,4-CHDA suppressed in the esterification and polyconsensation reactions and having a high melting point and excellent heat resistance, and a process for its production. A polyester resin obtainable by preparing an oligomer by an esterification reaction of a dicarboxylic acid component containing 1,4-cyclohexane dicarboxylic acid as the main component, with a diol component, and polycondensing this oligomer in the presence of a polycondensation catalyst; and a process for producing a polyester resin characterized in that the esterification reaction is carried out by means of a basic compound, and then, the polycondensation reaction is carried out by means of a polycondensation catalyst. In the resent invention, T0 and Tp satisfy 0≦{(T0−Tp)/T0}×100≦12 where T0 is the mol % of the trans form in the 1,4-cyclohexane dicarboxylic acid contained in the starting material, and Tp is the mol % of the trans form in the 1,4-cyclohexane dicarboxylic acid units contained in the obtainable polyester resin.
摘要:
The object is to provide a polycarbonate copolymer having excellent mechanical strength, good heat resistance, a low refractive index, a large Abbe number, a low berefringence and excellent transparency and containing a plant-derived raw material. Disclosed is a polycarbonate copolymer which comprises a constituent unit derived from a dihydroxy compound represented by the general formula (1) and a constituent unit derived from an alicyclic dihydroxy compound and has an Abbe number of 50 or greater and “a 5% heating weight loss temperature” (a temperature at which the 5% weight loss under heating is observed) of 340° C. or higher. Also disclosed is a process for producing the polycarbonate copolymer by reacting a dihydroxy compound represented by the general formula (1) and an alicyclic dihydroxy compound with a carbonate diester in the presence of a polymerization catalyst.
摘要:
The problem to be solved by the present invention is to provide a polycarbonate copolymer containing a plant-derived raw material, which is excellent in the mechanical strength and heat-resistant and assured of small refractive index, large Abbe number, small birefringence and excellent transparency. The present invention provides a polycarbonate copolymer containing a constitutional unit derived from a dihydroxy compound represented by the following formula (1) and a constitutional unit derived from an alicyclic dihydroxy compound, wherein the Abbe number is 50 or more and the 5% thermal reduction temperature is 340° C. or more; and a method of producing this polycarbonate copolymer by reacting a dihydroxy compound represented by the following formula (1) and an alicyclic hydroxy compound with a carbonic acid diester in the presence of a polymerization catalyst.
摘要:
A subject for the invention relates to processes for producing a polycarbonate containing a plant-derived starting material and to molded articles thereof, the polycarbonate having excellent mechanical strength, heat resistance, a low refractive index, a large Abbe number, low birefringence, and excellent transparency. The invention relates to a process for producing a polycarbonate which includes a step in which one or more dihydroxy compounds including a dihydroxy compound having at least one linking group —CH2—O— in the molecule thereof are reacted with a carbonic acid diester in the presence of a polymerization catalyst, wherein the dihydroxy compound having at least one linking group —CH2—O— in the molecule thereof has a formic acid content lower than 20 ppm. The invention further relates to a molded article constituted of a polycarbonate or a composition of the polycarbonate, the polycarbonate being a polycarbonate which contains constituent units derived from a dihydroxy compound having at least one linking group —CH2—O— in the molecule thereof and has an Abbe number of 50 or larger and a 5% weight loss temperature of 340° C. or higher.
摘要:
The problem to be solved by the present invention is to provide a polycarbonate copolymer containing a plant-derived raw material, which is excellent in the mechanical strength and heat-resistant and assured of small refractive index, large Abbe number, small birefringence and excellent transparency. The present invention provides a polycarbonate copolymer containing a constitutional unit derived from a dihydroxy compound represented by the following formula (1) and a constitutional unit derived from an alicyclic dihydroxy compound, wherein the Abbe number is 50 or more and the 5% thermal reduction temperature is 340° C. or more; and a method of producing this polycarbonate copolymer by reacting a dihydroxy compound represented by the following formula (1) and an alicyclic hydroxy compound with a carbonic acid diester in the presence of a polymerization catalyst.
摘要:
A subject for the invention relates to processes for producing a polycarbonate containing a plant-derived starting material and to molded articles thereof, the polycarbonate having excellent mechanical strength, heat resistance, a low refractive index, a large Abbe number, low birefringence, and excellent transparency. The invention relates to a process for producing a polycarbonate which includes a step in which one or more dihydroxy compounds including a dihydroxy compound having at least one linking group —CH2—O— in the molecule thereof are reacted with a carbonic acid diester in the presence of a polymerization catalyst, wherein the dihydroxy compound having at least one linking group —CH2—O— in the molecule thereof has a formic acid content lower than 20 ppm. The invention further relates to a molded article constituted of a polycarbonate or a composition of the polycarbonate, the polycarbonate being a polycarbonate which contains constituent units derived from a dihydroxy compound having at least one linking group —CH2—O— in the molecule thereof and has an Abbe number of 50 or larger and a 5% weight loss temperature of 340° C. or higher.
摘要:
The problem to be solved by the present invention is to provide a polycarbonate copolymer containing a plant-derived raw material, which is excellent in the mechanical strength and heat-resistant and assured of small refractive index, large Abbe number, small birefringence and excellent transparency. The present invention provides a polycarbonate copolymer containing a constitutional unit derived from a dihydroxy compound represented by the following formula (1) and a constitutional unit derived from an alicyclic dihydroxy compound, wherein the Abbe number is 50 or more and the 5% thermal reduction temperature is 340° C. or more; and a method of producing this polycarbonate copolymer by reacting a dihydroxy compound represented by the following formula (1) and an alicyclic hydroxy compound with a carbonic acid diester in the presence of a polymerization catalyst.
摘要:
An alicyclic polyester which is suitable for use as an optical material, low in coloration, satisfactory in thermal stability and hydrolytic stability, and reduced in foreign-matter content; and a resin composition comprising the alicyclic polyester and a polycarbonate. The alicyclic polyester is produced from a dicarboxylic acid ingredient comprising an alicyclic dicarboxylic acid as a major component and a diol ingredient comprising an alicyclic diol as a major component with the aid of a polycondensation catalyst comprising a titanium compound and an alkaline earth metal compound. The alicyclic polyester has a titanium content in terms of metal atom amount of 1-25 wt. ppm, excluding 25 wt. ppm, a ratio of the weight of the alkaline earth metal (M) to the weight of the titanium in terms of metal atom amount ratio, (M/Ti), of 0.25-1.0, and an intrinsic viscosity of 0.4 dl/g or higher.
摘要:
To provide a polyester resin particularly useful in application to optical films, etc. A polyester resin which is an alicyclic polyester comprising dicarboxylic acid units and diol units, characterized by the following (1) to (4): (1) the dicarboxylic acid units are composed mainly of 1,4-cyclohexanedicarboxylic acid units, (2) the diol units are composed mainly of 1,4-cyclohexanedimethanol units, (3) the ratio of alkyl ester terminals to all terminals of the polyester is at most 5 mol %, and (4) the light transmittance of a molded plate of the resin having a thickness of 2 mm is at least 87%.
摘要:
There is provided a resin composition (I) exhibiting a less coloration which is excellent in transparency as well as hydrolysis resistance and chemical resistance. Also, there is provided a resin composition (II) exhibiting excellent transparency, hue, fluidity, impact resistance, wet-heat resistance and retention heat stability in a well-balanced condition. The present invention relates to a resin composition (I) comprising 100 parts by weight of a mixture comprising (A) 1 to 99 parts by weight of an aromatic polycarbonate resin and (B) 1 to 99 parts by weight of an alicyclic polyester resin; and (C) 0.001 to 5 parts by weight of a specific organic phosphoric ester metal salt, and a resin composition (II) comprising 100 parts by weight of a mixture comprising (A) 1 to 99 parts by weight of an aromatic polycarbonate resin and (B) 1 to 99 parts by weight of an alicyclic polyester resin; (C) 0.001 to 5 parts by weight of a specific organic phosphoric ester metal salt; and (D) 0.001 to 1 part by weight of a specific phosphorus-based compound.