Abstract:
A polyester composition includes a ligand capable of coordinating to a metal or metal ion, wherein the ligand includes at least one donor atom selected from the group consisting of a nitrogen atom, a sulfur atom, and an oxygen atom. Consequently, it is possible to inactivate a metal catalyst which adversely affects heat resistance. As a result, it is possible to obtain polyester compositions and films having excellent heat resistance, colorability, and weathering resistance. Moreover, in the process of producing a polyester, by separating and recovering a catalyst by adding a ligand which is capable of coordinating to a metal or metal ion and which includes at least one donor atom selected from the group consisting of a nitrogen atom, a sulfur atom, and an oxygen atom, it is possible to improve the heat resistance of the polyester composition.
Abstract:
A polyester resin composition having an equivalent spherical diameter of 1 mm to 50 mm, a degree of crystallization of not less than 65% and less than 99%, an intrinsic viscosity of not more than 0.7 dl/g and a cyclic trimer content of not more than 0.4% by weight. This polymer resin composition has an excellent color tone, causes no significant viscosity lowering or viscosity rise, and can withstand a process which is exposed to a long-term thermal history. A polyester resin composition having a viscosity suitable for extrusion in a general-purpose manner, a production process thereof, and a polyester film are also provided.
Abstract:
A practical polyester which is provided with substantially no antimony compound as a polycondensation catalyst. (I) One of the polyester resin compositions has an antimony content of 30 ppm by weight or lower, a titanium content of 0.5 to 50 ppm by weight, and a phosphorus content of 0.1 to 100 ppm by weight and has titanium-containing particles having a diameter of 1 µm or larger in terms of equivalent-circle diameter, the number of the particles being less than 100 per 0.02 mg. (II) The other polyester resin composition has an antimony content of 30 ppm by weight or lower, a titanium content of 0.5 to 50 ppm by weight, and a phosphorus content of 0.1 to 100 ppm by weight and contains 0.1 to 5 wt.% organic polymer particles which have an average particle diameter as measured by the dynamic light scattering method of 0.05 to 3 µm and in which the number of coarse particles having a particle diameter at least two times the average particle diameter account for up to 0.01% of the number of all particles.
Abstract:
A polyester composition containing a ligand which is able to coordinate to a metal or a metal ion and contains as the donor atom at least one of nitrogen, sulfur, and oxygen. In this composition, the metal catalyst causative of lowering the heat resistance of the polyester can be inactivated by the ligand. The polyester composition and films made thereof are excellent in heat resistance, colorability, and weather resistance. A polyester composition improved in heat resistance can be produced by adding, in the step of producing a polyester with a metal catalyst, a ligand which is able to coordinate to a metal or a metal ion and contains as the donor atom at least one of nitrogen, sulfur, and oxygen to thereby separate and recover the catalyst.
Abstract:
PROBLEM TO BE SOLVED: To provide a polyester composition and a polyester film hardly causing bleedout and other problems encountered in a conventional method in which an additive is employed, excellent in molding properties and sliding properties and suitably employed for applications as a magnetic recording medium in particular. SOLUTION: The polyester composition is composed mainly of a polyester and has a peak ratio B of at least 5×10-3 and at most 500×10-3 and a (peak ratio B) to (peak ratio A) ratio of at least 0.7, where the peak ratio A is a quotient of a peak area within 1-3 ppm divided by a peak area within 4-6 ppm when the polyester composition is observed by the proton NMR and the peak ratio B is a quotient of a peak area within 1-3 ppm divided by a peak area within 4-6 ppm when a polyester composition, obtained by dissolving the polyester composition in a solvent and subsequently re-precipitating by diluting with toluene, is observed by the proton NMR.
Abstract:
PURPOSE:To provide a microporous membrane which maintains adequate durabil ity under hard conditions such as solvent separation/recovery, treatment of organic vapor and high-temperature liquid, thermal sterilization and chlorine sterilization of bacteria and alkali cleaning and can be used as a support of composite reverse osmosis membrane or a gas separation membrane as well as a method for manufacturing said microporous membrane. CONSTITUTION:The microporous membrane consists mainly of a polymer expressed in the repetitive unit of formula-(Ph-S)m-(Ph-SO2)n-(in the formula, Ph is a phenylene group; m,n are a natural number). In this membrane manufacture, an aprotic polar organic solvent is used as a solvent of polymer, which consists of 0.5 to 20wt% of lithium salt of monobasic acid for dissolving the polymer.
Abstract:
PROBLEM TO BE SOLVED: To provide a polyester composition which is reduced in a polymer gel compound generated upon melt extrusion, and which has excellent heat resistance and film forming property, and also to provide a film. SOLUTION: An alkali metal amount: Am (mol/ton), an alkaline earth metal amount: Em (mol/ton), an a phosphor element amount: Pm (mol/ton), contained in a polyester, are controlled so as to satisfy the relation: 5
Abstract:
PROBLEM TO BE SOLVED: To provide a polyester composition hardly suffering from coarse projection and surface defects and excellent in oligomer deposition-inhibiting properties, and a polyester film. SOLUTION: The polyester composition contains in the molecule a constituting unit represented by chemical formula (9) (wherein R41 -R44 are each H or a hydrocarbyl group having a carbon number in the range of 1-20, provided that in the case of a hydrocarbyl group at least one hydrocarbyl group has at least 6 carbons). Preferably, the content of the above constituting unit is caused to be in the range of 0.003-2 mole % based on the mole number of constituting portions derived from the dicarboxylic acid component of the polyester. The polyester film is also provided.
Abstract:
PROBLEM TO BE SOLVED: To provide a polyester film almost free from coarse projection and defects, and excellent in surface properties, oligomer deposition-inhibiting properties and productivity. SOLUTION: The polyester composition comprises a 20-60C ester compound comprising a higher aliphatic carboxylic acid and a higher aliphatic alcohol and gives X and Y simultaneously satisfying following equations (1) and (2); 0.1