Kureha Corporation

Tokyo, Japan

Kureha Corporation

Tokyo, Japan

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The object of the present invention is to provide a carbonaceous material which is obtainable from plant-derived char and has a decreased specific surface area. Further, the object of the present invention is to provide a non-aqueous electrolyte secondary battery having excellent dedoping capacity, non-dedoping capacity, and charge-discharge efficiency. The object can be solved by a carbonaceous material for non-aqueous electrolyte secondary batteries characterized in that the carbonaceous material is obtained by heat-treating plant-derived char which is demineralized in gas-phase, and carbon precursor or volatile organic compound under a non-oxidizing gas atmosphere; and a specific surface area determined by a BET method is 10 m^(2)/g or less.


Patent
Kureha Corporation | Date: 2017-05-17

A heat-shrinkable multilayer film for being filled with contents, comprising an outer surface layer (A) comprising a heat-resistant thermoplastic resin, an intermediate layer (B) comprising a polyamide-based resin, an inner surface layer (D) comprising an ethylene-based copolymer, and adhesion strength between inner surface layers after treatment with 80C hot water being not less than 10 N/15 mm. The polyamide-based heat-shrinkable multilayer film obtained in this manner has optimal characteristics for applications that primarily require strength, and has greatly improved self-weldability demanded in packaging films for meat products such as fresh and processed meats.


Patent
Kureha Corporation | Date: 2017-05-17

A heat-shrinkable multilayer film for being filled with contents, comprising an outer surface layer (A) comprising a heat-resistant thermoplastic resin, an intermediate layer (B) comprising a polyamide-based resin, an inner surface layer (D) comprising an ethylene-based copolymer, and adhesion strength between inner surface layers after treatment with 80C hot water being not less than 10 N/15 mm. The polyamide-based heat-shrinkable multilayer film obtained in this manner has optimal characteristics for applications that primarily require strength, and has greatly improved self-weldability demanded in packaging films for meat products such as fresh and processed meats.


An object of the present invention is to provide an orally administered adsorbent capable of adsorbing large quantities of tryptophan or indoxyl sulfate in the presence of bile acid. Accordingly, the above object can be solved by an orally administered adsorbent characterized by containing surface-modified spherical activated carbon having bulk density from 0.30 g/mL to 0.46 g/mL, a specific surface area determined by the Brunauer-Emmett-Teller (BET) method of not less than 1900 m^(2)/g, total acidic group content from 0.30 meq/g to 1.20 meq/g, and total basic group content from 0.20 meq/g to 0.9 meq/g.


A non-aqueous electrolyte secondary battery having a charge/discharge capacity, and a small irreversible capacity, which is a difference between a doping capacity and a de-doping capacity, and utilizing an active material efficiently, is provided. Such a non-aqueous electrolyte secondary battery can be provided by using a carbonaceous material for a non-aqueous electrolyte secondary battery anode of the present invention, a production method of which includes:(1) impregnating an alkali metal to a carbonaceous material precursor by adding a compound including an elemental alkali metal to obtain an alkali-impregnated carbonaceous precursor;(2) subjecting the alkali-impregnated carbonaceous precursor to heat treatment by:(a) subjecting the alkali-impregnated carbonaceous precursor to main heat treatment in a non-oxidizing gas atmosphere at a temperature from 800C to 1500C;wherein a true density is from 1.35 to 1.60 g/cm^(3);a specific surface area obtained by BET method using nitrogen adsorption is not greater than 30 m^(2)/g;an average particle size is not greater than 50 m; andan atomic ratio of hydrogen and carbon obtained by elemental analysis, H/C, is not greater than 0.1.


An object of the present invention is to provide a non-aqueous electrolyte secondary battery that has a large charge/discharge capacity, has a small irreversible capacity, which is the difference between the doping capacity and the de-doping capacity, and is capable of effectively using an active material. The problem described above can be solved by a method for producing a carbonaceous material for a non-aqueous electrolyte secondary battery anode, the method including: (1) an alkali metal compound impregnating step of adding an elemental alkali metal or a compound containing an elemental alkali metal to a carbonaceous precursor to obtain an alkali-impregnated carbonaceous precursor; (2) a heat treatment step of: (a) obtaining a heat-treated product by performing main heat treatment on the alkali-impregnated carbonaceous precursor at 800C to 1500C in a non-oxidizing gas atmosphere, or (b) obtaining a heat-treated product by performing pre-heat treatment on the alkali-impregnated carbonaceous precursor at a temperature of not lower than 400C and lower than 800C in a non-oxidizing gas atmosphere and then performing main heat treatment at 800C to 1500C in a non-oxidizing gas atmosphere; and (3) coating the heat-treated product with pyrolytic carbon.


This invention aims to provide a thermally foamable microsphere which is excellent in heat resistance, has a high expansion ratio, and shows stable foaming behavior; a method of producing the thermally foamable microsphere; and suitable use thereof. This invention provides a thermally foamable microsphere in which an outer shell encapsulating a foaming agent is formed of a copolymer having a polymethacrylimide structure. In particular, this invention provides a thermally foamable microsphere in which monomers capable of forming the polymethacrylimide structure by a copolymerization reaction are methacrylonitrile and methacrylic acid. Moreover, this invention provides a method of producing the thermally foamable microsphere and use of the thermally foamable microsphere as an additive.


An object of the present invention is to provide a non-aqueous electrolyte secondary battery which has a large charge/discharge capacity, has a small irreversible capacity, and is capable of effectively using an active material. This object can be achieved by a material for a non-aqueous electrolyte secondary battery anode; a specific surface area determined by a BET method being not greater than 30 m^(2)/g; an atomic ratio (H/C) of hydrogen atoms to carbon atoms determined by elemental analysis being not greater than 0.1; an average particle size being not greater than 50 m; and a diffraction intensity ratio (R-value) determined by Equation (1) being not greater than 1.25: (wherein I_(max) is a maximum value of a 002 diffraction intensity of carbon measured at an angle of diffraction (2) within a range of from 20 to 25 as determined by powder X-ray diffraction measured using CuK rays; I_(min) is a minimum value of a diffraction intensity measured at an angle of diffraction (2) within a range of from 15 to 20 as determined by powder X-ray diffraction; and I_(35) is a diffraction intensity at an angle of diffraction (2) of 35 as determined by powder X-ray diffraction).


A downhole tool, provided with: a downhole-tool member containing a reactive metal; a downhole-tool member containing a degradable resin composition that promotes degradation of the reactive metal, preferably a degradable resin composition containing a degradable resin that generates an acid by degradation or a degradable resin composition containing a degradable resin and an inorganic substance or organic substance that promotes degradation of the reactive metal; and, as desired, a degradable rubber member. Moreover, a well-drilling method using this downhole tool.


Patent
Kureha Corporation | Date: 2017-04-18

A plug for well drilling comprising a mandrel and members attached on an outer circumferential surface orthogonal to an axial direction of the mandrel, wherein at least one of the members or the mandrel is formed from a degradable material; a ring-shaped ratchet structure formed from a plurality of interlocking parts that allows movement of the member in one direction along the axial direction of the mandrel and restricts movement in the opposite direction is provided on an inner circumferential surface of the member and the outer circumferential surface of the mandrel; preferably further comprising a pushing jig including a ratchet structure and a ring-shaped plate adjacent to the axial direction leading side of the pushing jig. Additionally, a well drilling method using the plug for well drilling, comprising degrading a part or all of the plug after blocking a borehole.

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