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Kureha Corporation patents


Recent patent applications related to Kureha Corporation. Kureha Corporation is listed as an Agent/Assignee. Note: Kureha Corporation may have other listings under different names/spellings. We're not affiliated with Kureha Corporation, we're just tracking patents.

ARCHIVE: New 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 | Company Directory "K" | Kureha Corporation-related inventors


Solidification- and extrusion-molded article of polyglycolic acid and method for manufacturing same

Provided are: a polyglycolic acid (pga) solidification- and extrusion-molded article that is formed from a resin material containing pga, the pga having a weight average molecular weight of 100,000 to 300,000 and a melt viscosity (temperature: 270° c.; shearing speed: 120 sec−1) of 100 to 2,000 pa·s, and that has a tensile strength at a temperature of 150° c. Of 20 to 200 mpa; a downhole tool or component thereof for drilling and completion of petroleum recovery formed by machining the solidification- and extrusion-molded article; an isolation plug provided with the component; an isolation plug mandrel; and a method for manufacturing the pga solidification- and extrusion-molded article and a method for manufacturing the downhole tool or component thereof that comprise the steps of: supplying the resin material to an extruder (preferably from a fixed-quantity feeder); and after solidification- and extrusion-molding, pressurizing the solidification- and extrusion-molded article, and drawing the same while applying back pressure thereto in a direction of a forming die to suppress the expansion of the solidified and extruded matter.. ... Kureha Corporation

Polyarylene sulfide manufacturing method and polyarylene sulfide manufacturing device

To provide a polyarylene sulfide (hereinafter, pas) manufacturing method and pas manufacturing device that further eliminates processing costs in manufacturing pas, by recovering from solid content containing an unreacted sulfur source and alkali metal halide produced as a byproduct the sulfur source and the solid content with a reduced amount of the sulfur source, and then conveniently and easily reusing the unreacted sulfur source without performing a large-scale process. A method of manufacturing pas according to the present invention comprises: a polymerizing step of producing pas; an extracting step of bringing an extraction solvent into content with solid content produced in the polymerizing step, and extracting at least a portion of a sulfur source from the solid content; a recovering step of separating and recovering the solid content passing through the extracting step and an extraction liquid produced in the extracting step; and a recycling step of supplying at least a portion of the extraction liquid preferably as at least a portion of pas produced raw material in the polymerizing step; where the extraction solvent is (1) a protic organic solvent or (2) a mixed solvent containing water and an organic solvent, and the amount of the sulfur source in the solid content recovered in the recovering step is 2 parts by mass or less with regard to 100 parts by mass of the alkali metal halide.. ... Kureha Corporation

Composition for well drilling comprising reactive metal and degradable resin composition, molded product for well drilling, and method for well drilling

Provided are a molded product for well drilling comprising a reactive metal and a degradable resin composition that promotes a degradation reaction of the reactive metal, preferably a degradable resin composition comprising a degradable resin that generates acid upon degradation or a degradable resin composition containing a degradable resin and an inorganic material or an organic material that promotes degradation of the reactive metal; a molded product for well drilling which is a downhole tool or a downhole tool member; and a method for well drilling that uses said molded product for well drilling.. . ... Kureha Corporation

Polyglycolic acid resin composition, molded product for well drilling, and downhole tool member

. . . . In light of increasingly severe and diverse excavation conditions for hydrocarbon resource recovery, such as the drilling of very deep wells, provided is a highly impact-resistant polyglycolic acid resin composition that is resistant to damage even from contact or collision with various members during molding, transport, and well drilling; has excellent mechanical properties and heat resistance; can easily be removed as necessary after the completion of well treatment; and contributes to reducing the cost and shortening the process of well drilling. Also, provided is a molded product for well drilling, such as a downhole tool member.. ... Kureha Corporation

Carbonaceous molded body for battery electrode and method of manufacturing same

An object of the present invention is to provide a carbonaceous molded body for a battery electrode having high charge/discharge capacity, high initial charge/discharge efficiency, and excellent cycle life. The aforementioned object can be achieved by a carbonaceous molded body for a battery electrode of the present invention, including: carbon fibers where lithium can be doped and dedoped; and a carbonaceous material; wherein the thickness is 1 mm or less, atomic ratio (h/c) between hydrogen atoms and carbon atoms based on elemental analysis is 0.1 or less, porosity determined from bulk density of the molded body and true density of butanol is from 25 to 80%, and volatile matter content is 5.0 wt. ... Kureha Corporation

Branched polyarylene sulfide resin, method for manufacturing same and use as polymer modifier

. . A branched polyarylene sulfide resin includes an —s— substituent group with a cleaved disulfide compound, which has a halogen content of 4,000 ppm or less, a melt viscosity as measured at a temperature of 330° c. And a shear rate of 2 sec−1 of 1.0×104 to 50.0 x 104 pa·s, and a melt viscoelasticity tan δ as measured at a temperature of 310° c. ... Kureha Corporation

Pre-air-filter for internal combustion engine

It is provided that a pre-air-filter, for an internal combustion engine, which allows stiffness to be assured even when the weight is reduced, which also has excellent dust holding properties, and which has an excellent resistance to entry of water. A pre-air-filter for an internal combustion engine (1) contains a nonwoven fabric comprising a first fiber having a melting point of not lower than 80° c. ... Kureha Corporation

Aliphatic polyester composition, molded product, and manufacturing method of aliphatic polyester

A method of continuously manufacturing an aliphatic polyester composition from a cyclic ester and the like, wherein the temperature in an extruder is increased in two or more stages from a raw material supply port to a discharge port, the temperature at the discharge port is a temperature where the melt viscosity of the composition at the discharge port is from 100 to 2000 pa·s, the free acid concentration in the cyclic ester is 10 eq/t or less, and the unreacted cyclic ester concentration in the composition is less than 2 wt. %.. ... Kureha Corporation

Heat shrinkable stretched multilayer film for skin packaging, skin pack package using same, and method for producing heat shrinkable stretched multilayer film for skin packaging

. . A heat shrinkable stretched multilayer film for skin packaging comprising a crosslinked resin layer, a gas barrier resin layer, and a heat sealing resin layer sequentially arranged in this order from the outer side, and having dry thermal shrinkage rate of 10 to 55% in each of the machine direction (md) and of the transverse direction (td) at 120° c., and tensile elongation at break of 190% or greater in the machine direction at 120° c.. . ... Kureha Corporation

Resin composition, filler-containing resin film for non-aqueous electrolyte secondary battery, and method for producing filler-containing resin film for non-aqueous electrolyte secondary battery

An object of the present invention is to provide a filler-containing resin film in which shedding of inorganic materials or the like is suppressed, a resin composition that can be used in production of the filler-containing resin film, and a method for producing the filler-containing resin film. The filler-containing resin film of the present invention is a filler-containing resin film comprising: a vinylidene fluoride copolymer obtained by copolymerizing vinylidene fluoride and a compound represented by formula (1) (in formula (1), r1, r2, and r3 are each independently hydrogen atoms, chlorine atoms, or alkyl groups having from 1 to 5 carbons; and x′ is an atomic group having a molecular weight of 472 or less and having a main chain configured from 1 to 19 atoms); and an insulating inorganic filler. ... Kureha Corporation

Polyglycolic acid resin composition, molded product for well drilling, and downhole tool member

In light of increasingly severe and diverse excavation conditions for hydrocarbon resource recovery, such as the drilling of very deep wells, provided is a highly impact-resistant polyglycolic acid resin composition that is resistant to damage even from contact or collision with various members during molding, transport, and well drilling; has excellent mechanical properties and heat resistance; can easily be removed as necessary after the completion of well treatment; and contributes to reducing the cost and shortening the process of well drilling. Also, provided is a molded product for well drilling, such as a downhole tool member.. ... Kureha Corporation

Downhole tool containing downhole-tool member containing reactive metal and downhole-tool member containing degradable resin composition, and well-drilling method

. . . . 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.. ... Kureha Corporation

Applications of degradable polymer for delayed mechanical changes in wells

Degradable polylactic or polyhydroxyalkanoate polymers may be used to viscosify aqueous fluids for use in wells. Sand control screen or liner can be coated with a solid degradable polymer during placement in a well. ... Kureha Corporation

Production method for carbonaceous material for non-aqueous electrolyte secondary battery anode, and carbonaceous material for non-aqueous electrolyte secondary battery anode

. . . . . . 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 800° c. ... Kureha Corporation

08/03/17 / #20170218720

Plug for well drilling provided with ring-shaped ratchet structure

. . 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.. ... Kureha Corporation

06/22/17 / #20170175481

Molded product having effective thickness of 1 mm or more and containing aliphatic polyester resin, and downhole tool member for hydrocarbon resource recovery

Provided are a molded product having an effective thickness of 1 mm or more, the molded product being formed from an aliphatic polyester resin composition containing from 1 to 30 parts by mass of a carboxylic acid anhydride and preferably further containing from 1 to 50 parts by mass of at least one type of a short fiber reinforcing material, a thermoplastic elastomer, or an acrylic rubber core-shell polymer per 100 parts by mass of an aliphatic polyester resin containing not less than 50 mass % of a polyglycolic acid resin, the effective thickness being 1 mm or more; a downhole tool for hydrocarbon resource recovery formed from the molded product having an effective thickness of 1 mm or more; an aliphatic polyester resin composition for the downhole tool member for hydrocarbon resource recovery; and a well drilling method.. . ... Kureha Corporation

06/08/17 / #20170162874

Carbonaceous material for negative electrode of non-aqueous electrolyte secondary battery, negative electrode for non-aqueous electrolyte secondary battery, non-aqueous electrolyte secondary battery, and vehicle

. . . . A carbonaceous material for a negative electrode of a non-aqueous electrolyte secondary battery with high energy density relative to volume and excellent cycle characteristics is provided. The negative electrode material for a non-aqueous electrolyte secondary battery of the present invention includes a carbon material mixture including, as an active material, a plurality of non-graphitic carbon materials. ... Kureha Corporation

06/08/17 / #20170158942

Plug for well drilling provided with diametrically expandable annular rubber member formed from degradable rubber material

A plug for well drilling includes a mandrel and at least one diametrically expandable annular rubber member and at least one slip disposed on an outer circumferential surface orthogonal to an axial direction of the mandrel; (i) the mandrel being formed from a degradable material; and (ii) the at least one diametrically expandable annular rubber member being formed from a degradable rubber material having a rate of decrease of not less than 5% in 50% strain compressive stress after immersion in water at a temperature of 150° c. For 24 hours relative to the compressive stress before immersion; and/or having a rate of loss of mass of from 5 to 100% after immersion in water at a temperature of 150° c. ... Kureha Corporation

04/20/17 / #20170107329

Heat-treated fine polyarylene sulfide powder and manufacturing method for manufacturing same

. . . . . . . . . . A heat treated fine polyarylene sulfide powder. (i) the heat treated fine polyarylene sulfide powder is manufactured from separation liquid. ... Kureha Corporation

03/09/17 / #20170066884

Resin tapping member and method of separating and recovering polymer from polymer-containing liquid using same

A resin tapping member used for a method of separating and recovering that enables a polymer to be separated and recovered from a polymer-containing liquid during or after a polymerization reaction at a high quality, high efficiency, and high processing capacity. The resin tapping member for preventing clogging of a screen is used in separating and recovering a polymer obtained by a polymerization reaction in a solvent. ... Kureha Corporation

01/19/17 / #20170016298

Degradable rubber member for downhole tools, degradable seal member, degradable protecting member, downhole tool, and method for well drilling

. . . . A degradable rubber member for a downhole tool formed from a rubber material containing from 0.1 to 20 parts by mass of a degradation accelerator relative to 100 parts by mass of a degradable rubber (optionally containing other rubber materials and/or reinforcing materials), of which, preferably, the decrease rate of the mass or the 50% strain compressive stress after immersion for 24 hours in 150° c. Water is not less than 5%, and/or the mass loss rate after immersion for 72 hours in 150° c. ... Kureha Corporation

01/19/17 / #20170015900

Well treatment method by disintegrating elastic material by contacting seal member for downhole tools comprising elastic material with well treatment fluid

A well treatment method characterized by disintegrating an elastic material by contacting a seal member for downhole tools comprising the elastic material with a well treatment fluid (acids such as hydrochloric acid, formic acid, acetic acid, and hydrofluoric acid, alkalis, hot water, steam, organic solvents, and the like).. . ... Kureha Corporation

01/19/17 / #20170015772

Vinylidene fluoride copolymer, method for producing the same, gel electrolyte, and non-aqueous battery

The vinylidene fluoride copolymer of the present invention is a polymer obtained by copolymerizing at least one type of fluorine-based monomer selected from hexafluoropropylene and chlorotrifluoroethylene, vinylidene fluoride, and a compound represented by formula (1) (wherein x is an atomic group having a hydroxyl group or a carboxyl group and having a molecular weight of not greater than 517 with a main chain having from 1 to 19 atoms) and is obtained by adding the compound represented by formula (1) to the fluorine-based monomer and vinylidene fluoride in divided portions or continuously during copolymerization. The gel electrolyte of the present invention contains the vinylidene fluoride copolymer and a non-aqueous electrolyte solution, and the gel electrolyte has an excellent balance of ionic conductivity and gel strength.. ... Kureha Corporation








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