Kuraray Co.

Tsukuba, Japan

Kuraray Co.

Tsukuba, Japan
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Provided are an ethylene-vinyl alcohol copolymer, a resin composition and a molded product thereof being superior in long-run stability of melt molding, with inhibited coloring and generation of film forming defects such as flaws in formed film and streaks, and also being superior in appearance characteristics. An ethylene-vinyl alcohol copolymer (A) obtained by saponifying a copolymer of ethylene and a vinyl ester, in which molecular weights determined by using gel permeation chromatography with a differential refractive index detector and an ultraviolet and visible absorbance detector after a heat treatment in a nitrogen atmosphere at 220 C for 50 hrs satisfy the inequality (1):


Patent
Kuraray Co. | Date: 2017-05-17

The present invention relates to a thermoplastic polymer composition which contains 10-120 parts by mass of a polar group-containing polypropylene resin (B) per 100 parts by mass of a thermoplastic elastomer (A) that is a block copolymer having a polymer block containing an aromatic vinyl compound unit and a polymer block composed of a conjugated diene unit having 40% by mole or more of 1,2-bonds and 3,4-bonds in total, or a hydrogenated product of the block copolymer (provided that a thermoplastic polymer composition containing 1 part by mass or more of a polyvinyl acetal resin is excluded). A melt flow rate (MFR) of the polar group-containing polypropylene resin (B) is 0.1 to 300 g/10 min under the conditions of 230C and load: 2.16 kg (21.18 N).


A resin composition is provided that contains: an EVOH (A); an unmodified ethylene--olefin copolymer (B); an acid modified ethylene--olefin copolymer (C); and alkali metal salt (D), wherein a mass ratio [(A)/((B)+(C))] is from 80/20 to 65/35, a mass ratio [(B)/(C)] is from 92/8 to 70/30, (A) has an MFR of not less than 8.0 g/10 min. and not more than 15 g/10 min., a content of (D) is not less than 25 ppm and not more than 300 ppm in terms of metal, and the resin composition has an MFR of not less than 2.0 g/10 min. and not more than 4.0 g/10 min. The use of this resin composition enables production of a multilayer structure and an inner container for a bag-in-box having excellent oxygen barrier properties and high flexibility and bending resistance.


Patent
Kuraray Co. | Date: 2017-02-08

To provide a polyester binder fiber with improved adhesiveness and a fiber structure containing the polyester binder. (1) A polyester binder fiber includes a polyester and a polymer having a repeating unit represented by the following formula (1) in a proportion of 0.1 to 5.0 mass% based on the mass of the polyester, and the polyester binder fiber has a crystallization temperature measured by differential calorimetry in a range of 100 to 250C; (2) a fiber structure includes the polyester binder fibers, and polyester subject fibers without a crystallization temperature, the polyester subject fibers being bonded via the polyester binder fiber. In the forumla R_(1) and R_(2) are substituents each comprising arbitrary atoms chosen from C, H, N, O, S, P, and a halogen atom, the sum of the molecular weights of R_(1) and R_(2) is 40 or more, and n is a positive integer.


Patent
Kuraray Co. and Kuraray Europe GmbH | Date: 2017-02-15

Provided is a dispersion stabilizer for suspension polymerization comprising an aqueous emulsion containing a dispersant (A), a dispersoid (B), a graft polymer (C), and an aqueous medium, wherein the dispersant (A) contains a surfactant, the dispersoid (B) contains a polymer having an ethylenically unsaturated monomer unit, the graft polymer (C) is obtained by graft polymerization of the ethylenically unsaturated monomer with the dispersant (A), a mass ratio [A/(A + B + C)] is 0.001 or more and less than 0.18, a mass ratio [C/(A + B + C)] is 0 or more and less than 0.04, and the total content of the dispersant (A), the dispersoid (B), and the graft polymer (C) is 35 to 70 mass%. A vinyl polymer to be obtained by suspension polymerization of a vinyl compound using the dispersion stabilizer has good plasticizer absorption. Further, the number of fish-eyes that occur when the vinyl polymer is formed is small, and the hue deterioration is also suppressed. Further, the dispersion stabilizer also has excellent handleability.


The present invention provides a method of manufacturing a biaxially stretched film which exhibits small heat shrinkage and has excellent dimensional stability. An unstretched thermoplastic resin film composed of at least one thermoplastic resin layer is biaxially stretched in a longitudinal direction and a width direction to manufacture the biaxially stretched film. The method of manufacturing the biaxially stretched film according to the present invention includes: a process (I) for preheating the thermoplastic resin film to a temperature in a rubbery plateau region in a storage elastic modulus curve; a process (II) for biaxially stretching the thermoplastic resin film under a condition that a stretching speed is 500%/min or higher while heating the thermoplastic resin film to the temperature in the rubbery plateau region; a process (III) for cooling the thermoplastic resin film after the process (II) to a temperature in a glass-to-rubber transition region or a glass region in the storage elastic modulus curve; and a process (IV) for relaxing the thermoplastic resin film after the process (III) under the temperature in the glass-to-rubber transition region.


Provided are a thermoplastic elastomer composition containing 100 parts by mass of (a) a specified hydrogenated block copolymer and 0.01 to 5 parts by mass of (b) at least one additive selected from an antioxidant and a light stabilizer, wherein the additive (b) is soluble in toluene at room temperature, and the additive (b) exists in the inside and on the surface of the pellet; and a molded article formed from the pellet.


Patent
Kuraray Co. | Date: 2017-01-25

Disclosed is a composition capable of removing safely and efficiently a sulfur-containing compound contained in a hydrocarbon, particularly hydrogen sulfide, an -SH group-containing compound, or a mixture thereof. Provided is a composition for removal of a sulfur-containing compound in a hydrocarbon, the sulfur-containing compound being hydrogen sulfide, an -SH group-containing compound or a mixture thereof: the composition containing a dialdehyde having 6 to 16 carbon atoms as an active ingredient.


Provided are an alkaline battery separator suitably used for an alkaline battery, and an alkaline battery using the separator. The separator includes a nonwoven fabric including subject fibers; at least a part of the subject fibers containing a chelate forming fiber having a chelate formable functional group being capable of forming a chelate with a metal ion. The alkaline battery includes a positive electrode, a negative electrode, the above-described separator placed therebetween, and an electrolyte.


Patent
Kuraray Co. | Date: 2017-02-08

To provide a polyester polyol from which a polyurethane having acid resistance and alkali resistance can be produced. A polyester polyol containing 1,3-propanediol having an alicyclic skeleton in a side chain, 3-methyl-1,5-pentanediol and a dibasic acid component as constituent components.

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