Abstract: Polyoxymethylene, where a ratio of a low molecular weight component having a molecular weight of 10,000 or less in a molecular weight distribution is 7.0% or less of the total, and the molecular weight distribution is obtained by measurement by gel permeation chromatography (GPC) using polymethyl methacrylate (PMMA) as a standard substance.

Abstract: The present invention provides (I) a dry-stretched microporous membrane and a separator for an electric storage device excellent in balance among the required performances such as product safety, charge/discharge characteristics, dimension stability, energy cost, consideration to the environment, etc., (II) a separator for an electric storage device superior in product safety obtained by controlling a puncture depth of a microporous membrane comprised in the separator for an electric storage device, or/and (III) a dry-stretched microporous membrane and a separator for an electric power storage device excellent in product safety realized by controlling a porosity and a puncture strength of a thin microporous membrane.

Abstract: Polyoxymethylene, where a ratio of a low molecular weight component having a molecular weight of 10,000 or less in a molecular weight distribution is 7.0% or less of the total, and the molecular weight distribution is obtained by measurement by gel permeation chromatography (GPC) using polymethyl methacrylate (PMMA) as a standard substance.

Abstract: The present invention provides (I) a dry-stretched microporous membrane and a separator for an electric storage device excellent in balance among the required performances such as product safety, charge/discharge characteristics, dimension stability, energy cost, consideration to the environment, etc., (II) a separator for an electric storage device superior in product safety obtained by controlling a puncture depth of a microporous membrane comprised in the separator for an electric storage device, or/and (III) a dry-stretched microporous membrane and a separator for an electric power storage device excellent in product safety realized by controlling a porosity and a puncture strength of a thin microporous membrane.

Abstract: It is an object to provide a block copolymer composition for a viscous adhesive, which will be a viscous adhesive composition excellent in balance of the adhesive properties such as tack strength and tackiness, having a low melt viscosity, and excellent solubility, coating properties, ejection stability, and surface skin quality. The block copolymer composition for a viscous adhesive having: a component (a) in an amount of 50 mass % or more and 90 mass % or less; and a component (b) in an amount of 10 mass % or more and 50 mass % or less; a content of the vinyl aromatic monomer unit being 25 to 50 mass %; a viscosity of the 15 mass % toluene solution being 10 to 40 mPa·s; and a number average molecular weight ratio of the component (b) to the component (a) being 2.0 to 4.0.

Abstract: It is an object to provide a block copolymer composition for a viscous adhesive, which will be a viscous adhesive composition excellent in balance of the adhesive properties such as tack strength and tackiness, having a low melt viscosity, and excellent solubility, coating properties, ejection stability, and surface skin quality. The block copolymer composition for a viscous adhesive having: a component (a) in an amount of 50 mass % or more and 90 mass % or less; and a component (b) in an amount of 10 mass % or more and 50 mass % or less; a content of the vinyl aromatic monomer unit being 25 to 50 mass %; a viscosity of the 15 mass % toluene solution being 10 to 40 mPa·s; and a number average molecular weight ratio of the component (b) to the component (a) being 2.0 to 4.0.

Abstract: A styrene resin excellent in heat resistance, weatherability, melt stability, and suitability for recycling. It is a styrene copolymer obtained by living polymerization (Mw/Mn=1.6-4.0) which comprises isopropenylaromatic units (A) contained in an amount of 5 to 95 wt. % and vinylaromatic units, and has a glass transition temperature (Tg) which satisfies a specific relationship defined by the content of isopropenylaromatic units (A) in the copolymer.

Abstract: An object of the present invention is to provide highly pure ?-methylstyrene by efficiently removing polar substances present in the ?-methylstyrene. The present invention discloses a method for purifying ?-methylstyrene by reacting polar substances contained in the ?-methylstyrene in the presence of a basic substance, and separating a reaction product of the polar substance and the ?-methylstyrene.

Abstract: An object of the present invention is to provide highly pure ?-methylstyrene by efficiently removing polar substances present in the ?-methylstyrene. The present invention discloses a method for purifying ?-methylstyrene by reacting polar substances contained in the ?-methylstyrene in the presence of a basic substance, and separating a reaction product of the polar substance and the ?-methylstyrene.

Abstract: An aliphatic ketone polymer comprising a unit represented by the following formula (1), the unit represented by the following formula (2), and a unit represented by the following formula (3) or (4). (In the formulae, R1 to R10 may be the same or different and each represents hydrogen, an optionally halogenated C1-20 hydrocarbon group, halogeno, hydroxy, ester, alkoxy, cyano, imide, silyl, or a group selected from the group consisting of C1-20 hydrocarbon groups substituted by a functional group selected among hydroxy, ester, alkoxy, cyano, imide, and silyl, provided that R2 and R8 may be bonded to R3 and R9, respectively, to form a monocycle or polycycle; and n1, n2, and N3 satisfy 1?n1?20, 1?n2?35,000, and 1?n3?40,000.

Abstract: A styrene resin excellent in heat resistance, weatherability, melt stability, and suitability for recycling. It is a styrene copolymer obtained by living polymerization (Mw/Mn=1.6-4.0) which comprises isopropenylaromatic units (A) contained in an amount of 5 to 95 wt. % and vinylaromatic units, and has a glass transition temperature (Tg) which satisfies a specific relationship defined by the content of isopropenylaromatic units (A) in the copolymer.

Abstract: A process for producing a vinyl polymer which comprises carrying out anionic polymerization under the condition that the polymerization temperature is not lower than 45° C. and not higher than 250° C. and the concentration of the vinyl monomer based on the polymerization solvent is 45-100% by weight, wherein the metal of the cation forming a counterpart to the carbonic anion at the polymerization propagating species consists essentially of Mg, or Mg and M1 wherein M1 is at least one alkali metal selected from the group consisting of Li, Na and K, and the molar concentrations of the metals of Mg and M1 satisfy the relation of [Mg]/[M1]≧4, the invention also relates to a vinyl monomer polymerization initiator comprising (R2)2Mg wherein R2 is a hydrocarbon group.

Abstract: The present invention provides a polyamide resin composition which comprises:(A), as a polyamide component, 30-95% by weight of a polyamide resin which is a half-aromatic polyamide comprising (a) 70-95% by weight of hexamethyleneadipamide unit obtained from adipic acid and hexamethylenediamine and (b) 5-30% by weight of hexamethyleneisophthalmide unit obtained from isophthalic acid and hexamethylenediamine and which has a sulfuric acid solution viscosity .eta.r of 1.5-2.8 and(B) 5-70% by weight of at least one inorganic filler selected from glass fiber, carbon fiber, mica, talc, kaolin, wollastonite, calcium carbonate and potassium titanate. Molded articles having a high surface gloss and comprising said resin composition are also provided.