Kureha Corporation

Tokyo, Japan

Kureha Corporation

Tokyo, Japan
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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.


To provide a carbonaceous material for a non-aqueous electrolyte secondary battery anode that yields an anode for a non-aqueous electrolyte secondary battery having excellent input/output characteristics, and a non-aqueous electrolyte secondary battery having high discharge capacity per unit volume, and a non-aqueous electrolyte secondary battery and a vehicle comprising this non-aqueous electrolyte secondary battery anode. The carbonaceous material for a non-aqueous electrolyte secondary battery anode of the present invention has a number average particle size of from 0.1 to 2.0 m, a value of a number average particle size divided by a volume average particle size of not greater than 0.3, an average interlayer spacing d_(002) of an (002) plane determined by X-ray diffraction of from 0.340 to 0.390 nm, and an atomic ratio (H/C) of hydrogen and carbon of not greater than 0.10.


Provided is a carbonaceous material for a non-aqueous electrolyte secondary battery anode having high discharge capacity per unit volume and excellent storage characteristics. The carbonaceous material for a non-aqueous electrolyte secondary battery anode of the present invention has a true density (_(Bt)) determined by a pycnometer method using butanol of not less than 1.55 g/cm^(3) and less than 1.75 g/cm^(3) and a discharge capacity of an anode at 0.05 V to 1.5 V in terms of a lithium reference electrode standard of not less than 180 mAh/g. Furthermore, the slope 0.9/X (Vg/Ah) of a discharge curve calculated from a discharge capacity X (Ah/g) and a potential difference of 0.9 (V) corresponding to 0.2 V to 1.1 V in terms of a lithium reference electrode standard is not greater than 0.75 (Vg/Ah), and an absorbed moisture quantity after storage for 100 hours in a 25C 50% RH air atmosphere is not greater than 1.5 wt%.


An object of the present invention is to provide an all-solid battery having high energy density. The problem can be solved by a negative electrode for an all-solid battery comprising:a carbonaceous material having a true density of from 1.30 g/cm^(3) to 1.70 g/cm^(3) determined by a butanol method, a specific surface area of from 0.5 to 50.0 m^(2)/g, an average particle size D_(v50) of from 1 to 50 m, and a combustion peak T (C) according to differential thermal analysis and a butanol true density _(Bt) (g/cm^(3)) satisfying the following formula (1): a solid electrolyte.


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. The carbon material mixture has a true density (_(Bt)) determined by a pycnometer method using butanol of 1.60 g/cm^(3) or greater and 2.05 g/cm^(3) or less, an atom ratio (H/C) of hydrogen atoms to carbon atoms determined by elemental analysis of 0.10 or less, and a discharge capacity at from 0 to 0.1 V based on a lithium reference electrode of 80 mAh/g or greater and 230 mAh/g or less.


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.


A negative electrode material for a non-aqueous electrolyte secondary battery and the like with high discharge capacity relative to volume and excellent cycle characteristics are provided. The negative electrode material for a non-aqueous electrolyte secondary battery of the present invention comprises, as an active material, a carbon material mixture including a non-graphitic carbon material and a graphitic material. In this carbon material mixture, the non-graphitic carbon material has an atom ratio (H/C) of hydrogen atoms to carbon atoms determined by elemental analysis of 0.10 or less, and an average particle size (D_(v50)) of from 1 to 8 m; and the graphitic material has a true density (_(Bt)) determined by a pycnometer method using butanol of 2.15 g/cm^(3) or greater. The true density (_(Bt)) of the non-graphitic carbon material is preferably 1.52 g/cm^(3) or greater and less than 2.15 g/cm^(3).


An object of the present invention is to provide a production method for suppressing the deformation of a negative electrode in the production of a negative electrode for an all-solid-state battery using turbostratic carbon and a solid electrolyte. The problem described above can be solved by a production method for a negative electrode for an all-solid-state battery comprising the steps of:(1) coating a carbonaceous material having a true density of from 1.30 g/cm^(3) to 2.10 g/cm^(3) determined by a butanol method with a solid electrolyte; and(2) pressure-molding the solid electrolyte-coated carbonaceous material.


To provide a method of melt-molding a vinylidene fluoride resin, in which the melt molding can be performed at a lower temperature. A composition is melt-molded at a shear rate of 1 s^(-1) to 600 s^(-1), where the composition contains a vinylidene fluoride resin having a weight average molecular weight of 250,000 to 450,000 and polyethylene having a melt flow rate of 0.04 g/10 min to 40 g/10 min, and an amount of the polyethylene being from 0.1 parts by mass to 5.0 parts by mass per 100 parts by mass of the vinylidene fluoride resin.

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