Abstract:
A sea-islands type composite fiber characterized in that an island component is a polymer having moisture absorbability, the ratio (T/R) of the thickness (T) of an outermost layer to the diameter (R) of the fiber on a transverse cross-section of the fiber is 0.05 to 0.25, and the moisture absorption rate difference (MR) after a hot water treatment is 2.0 to 10.0%. The term "thickness of an outermost layer" refers to the difference between the radius of the fiber and the radius of a circumscribed circle formed by connecting apexes of island components located on an outermost periphery, and represents the thickness of a sea component in the outermost layer. Provided is a sea-islands type composite fiber which does not undergo the cracking of a sea component upon the volume expansion of a moisture-absorbable polymer that serves as an island component during a hot water treatment such as a dyeing treatment, rarely undergoes the formation of dying specks or fluffs when the composite fiber is formed into a fiber structure such as a woven fabric or a knitted fabric, has excellent quality, is reduced in the elution of the moisture-absorbable polymer, also has excellent moisture absorbability even after a hot water treatment such as a dyeing treatment, and also has dry touch inherent to a polyester fiber when the sea component is polyester.
Abstract:
THE PRESENT INVENTION PROVIDES A COPOLYESTER HAVING HIGH HYGROSCOPIC PROPERTIES WHILE RETAINING THE EXCELLENT PROPERTIES OF POLYESTER, AND A POLYESTER FIBER COMPOSED OF THE COPOLYESTER HAVING AN EXCELLENT HYGROSCOPICITY. THE COPOLYESTER OF THE PRESENT INVENTION IS A COPOLYESTER COMPRISING ETHYLENE TEREPHTHALATE AS MAIN REPEATING UNITS AND COPOLYMERIZED POLYETHYLENE GLYCOL IN AN AMOUNT OF FROM 10 TO 25% BY WEIGHT, THE POLYETHYLENE GLYCOL HAVING A NUMBER AVERAGE MOLECULAR WEIGHT OF FROM 8,000 TO 20,000, WHEREIN THE COPOLYESTER HAS AN AMORPHOUS STRUCTURE IN WHICH POLYETHYLENE GLYCOL AND POLYETHYLENE TEREPHTHALATE COEXIST AND WHICH IS MAINLY COMPOSED OF POLYETHYLENE GLYCOL.
Abstract:
The present invention relates to a polyester polymerization catalyst, comprising a solution containing an aluminum compound and an alkali compound, with water or an organic solvent or a mixture consisting of water and an organic solvent as the medium, a production method thereof, and a polyester production method, in which the product obtained by the esterification reaction or ester interchange reaction between an aromatic dicarboxylic acid or any of its ester forming derivative and a diol is polycondensed, to produce a polyester, comprising the use of said polymerization catalyst containing an aluminum compound. The present invention can provide a polyester excellent in processability and can overcome such problems as spinneret contamination, filtration pressure rise, filament breaking, film breaking and foreign matter production in the production process of products such as fibers, films, resins and bottles.
Abstract:
POLYESTER COMPOSITION COMPRISING A POLYESTER AND 0.5 TO 300 PPM, EXPRESSED AS TITANIUM ATOMS, OF A COMPOUND OXIDE (A) CONTAINING TITANIUM AS AN ESSENTIAL ELEMENT AND ALSO CONTAINING A METAL ELEMENT SELECTED FROM THE GROUP CONSISTING OF ALUMINUM, ZIRCONIUM, GERMANIUM, TIN AND SILICON, AND 0.001 TO 40 WT OF PARTICLES HAVING AN AVERAGE PARTICLE SIZE OF 0.01 TO 10 µM, AND A PRODUCTION METHOD, AND A FIBER OR FILMCOMPOSED OF THE POLYESTER COMPOSITION.
Abstract:
The present invention relates to a polyester composition, comprising 0.5 to 300 ppm, as titanium atoms, of a compound oxide (A) containing titanium as an essential element and also containing a metal element selected from a group consisting of aluminum, zirconium, germanium, tin and silicon, and 0.001 to 40 wt% of particles with an average particle size of 0.01 to 10 mu m, and also to a method of production thereof, and a film composed of said polyester composition. The polyester composition of the present invention is excellent in moldability and heat resistance and solves such problems as die contamination, filtration pressure rise and yarn breaking in the production of such moldings as fibers, films and bottles. Furthermore, the polyester film of the present invention is suitable for packaging, being excellent in taste property and long-term storage quality, and can be suitably used for packaging materials, above all for being formed, especially for being laminated and formed with a substrate such as paper, nonwoven fabric or metal, to make containers, etc.
Abstract:
The present invention relates to a polyester polymerization catalyst, comprising a solution containing an aluminum compound and an alkali compound, with water or an organic solvent or a mixture consisting of water and an organic solvent as the medium, a production method thereof, and a polyester production method, in which the product obtained by the esterification reaction or ester interchange reaction between an aromatic dicarboxylic acid or any of its ester forming derivative and a diol is polycondensed, to produce a polyester, comprising the use of said polymerization catalyst containing an aluminum compound. The present invention can provide a polyester excellent in processability and can overcome such problems as spinneret contamination, filtration pressure rise, filament breaking, film breaking and foreign matter production in the production process of products such as fibers, films, resins and bottles.
Abstract:
A polymerization catalyst for polyester production which is a solution of solutes comprising an aluminum compound and an alkali compound in water, an organic solvent, or a mixture of both; and a process for producing a polyester which comprises esterifying or transesterifying an aromatic dicarboxylic acid or an ester-forming derivative thereof with a diol or an ester-forming derivative thereof and condensation-polymerizing the resultant reaction product, characterized by using the polymerization catalyst containing an aluminum compound. The catalyst can yield a polyester having excellent moldability and being usable for producing moldings such as fibers, films, resins, bottles, etc., without posing problems such as nozzle fouling, filtering pressure increase, thread breakage, film breakage, and defects caused by foreign substances.
Abstract:
The present invention relates to a polyester polymerization catalyst, comprising a solution containing an aluminum compound and an alkali compound, with water or an organic solvent or a mixture consisting of water and an organic solvent as the medium, a production method thereof, and a polyester production method, in which the product obtained by the esterification reaction or ester interchange reaction between an aromatic dicarboxylic acid or any of its ester forming derivative and a diol is polycondensed, to produce a polyester, comprising the use of said polymerization catalyst containing an aluminum compound. The present invention can provide a polyester excellent in processability and can overcome such problems as spinneret contamination, filtration pressure rise, filament breaking, film breaking and foreign matter production in the production process of products such as fibers, films, resins and bottles.
Abstract:
A polyester composition which comprises a composite oxide (A) comprising titanium as an essential element and at least one metal element selected from among aluminum, zirconium, germanium, tin and silicon in an amount of 0.5 to 300 ppm in terms of titanium atom, and particles having an average particle diameter of 0.01 to 10 νm in an amount of 0.001 to 40 wt.%; a method for producing the same; and a film comprising the polyester composition. The present invention can be employed to provide a polyester composition which is excellent in molding processability and heat resistance and thus, in the production of a molded article such as a fiber, a film and a bottle, is free from problems such as staining of a mouthpiece, increase in filter pressure and yarn breaking. The film is suitable for packaging, is excellent in keeping good taste and in storing for a long period of time, and can be suitably used in fabricating an article for packaging, especially a laminate containing a substrate made of paper, non-woven fabric or metal and a container.
Abstract:
PROBLEM TO BE SOLVED: To produce a catalyst for manufacturing a polyester excellent in processability and heat resistance and resolved in problems such as head stain, filter pressure rise and thread breakage, and to provide a method for manufacturing the polyester. SOLUTION: The catalyst for manufacturing a polyester comprises titanium oxide as a main component and a titanium compound having a molecular weight of 500-100,000 g/mol.