Max Co., Ltd.

Nippon Zeon Company, Ltd.

Zeon Corporation

Nohmi Bosai Kogyo Co., Ltd.

Katsuya Nakamura

Takeo Hattori

Eitaro Nakamura

Tomohiro Irago

Toshihide Miwa

Masahiro Yamakawa

Akira Nakayama

Makoto Yamamoto

Takao Suzuki

Kotaro Hata

Fumio Takano

Kouichirou Maeda

Hidekazu Mori

Takahiro Takasaki

Takao Hasegawa

Mamoru Nakamura

Atsuhiro Kanzaki

Masaru Ando

Kenji Akimoto

Mamoru Honda

Katsuhisa Seki

Hiroshi Kitaguchi

Tsutomu Ueda

Tetsuyo Kawahara

Shigeru Toyoshima

Stapler

A slurry composition for a positive electrode for a lithium ion secondary battery, comprising a polymer A wherein a HOMO value by a semiempirical method molecular orbital calculation is &#x2212;13.5 eV to &#x2212;10 eV and a content of ethylene repeating units is 30 mol % to 95 mol %; a polymer B wherein a HOMO value by a semiempirical method molecular orbital calculation is &#x2212;13.5 eV to &#x2212;10 eV, a glass transition temperature is &#x2212;80&#xb0; C. to 0&#xb0; C., and a gel content is 50 wt % or more; an active material for a positive electrode; a conductivity adding agent; and a liquid medium C in which the polymer A dissolves but the polymer B does not dissolve. According to the composition, a lithium ion secondary battery having a large battery capacity, a good charge/discharge cycle characteristic and an improved rate characteristic can be realized.

Slurry composition for secondary cell positive electrode, secondary cell positive electrode and secondary cell

Electric scissors

On the one surface of a back plate suited to a length-and-width size of a ring binder, hooks serving as an engaging means are formed. The back plate is fixed to the spine surface of the file cover. When the ring binder is pressed against the back plate, the hooks are engaged with the ring binder so that the file cover is mounted on a booklet bound with the ring binder.

Back plate and file cover for ring binder

A slurry composition for electrode comprising a binder, an active material, and a liquid medium, characterized in that the binder comprises a polymer (X) comprising 60 to 95 mole % of repeating units derived from acrylonitrile or methacrylonitrile and 5 to 30 mole % of repeating units derived from at least one kind of a monomer selected from 1-olefins and compounds represented by the following general formula (1): CH&#x2550;CR&#x2014;COORwherein Rrepresents a hydrogen atom or a methyl group and Rrepresents an alkyl group; and the liquid medium is capable of dissolving the polymer (X). The slurry composition allows the manufacture of a lithium ion secondary battery having enhanced capacity and good charge-discharge cycle characteristics and good charge-discharge rate characteristics.

Slurry composition, electrode and secondary cell

Binder composition for lithium ion secondary battery electrodes and use thereof

A binder for coating materials containing dispersed inorganic powder comprises a polyurethane resin containing (a) 2.2 to 7.0 terminal epoxy groups in one molecule in average and (b) 0.1 to 5.0% by weight as SO.sub.3 -- of a sulfonic acid salt group, 0.05 to 3.0% by weight as COO-- of a carboxylic acid salt group, or 0.02 to 1.0% by weight as N.sup.+ of a quaternary ammonium salt group in the molecule, and having a number-average molecular weight of 2,000 to 10,000. A coating material containing dispersed inorganic powder and a magnetic recording medium both use this binder. In a recording medium comprising a magnetic layer placed on a non-magnetic substrate, the magnetic layer comprises polyurethane resin (A) as a binder, vinyl chloride polymer (B) containing 0.1 to 20% by weight of epoxy group and having an average degree of polymerization of 100 to 500, as another binder, (C) an alicylic acid anhydride as a crosslinking agent, and (E) a tertiary amine as a catalyst, and at least one of the binders is crosslinked between the epoxy groups therein by the reaction in which components (C) and (E) take part. The coating material containing fine inorganic powder dispersed with stability and having a low viscosity can be obtained by using, as the binder, the polyurethane resin having terminal epoxy groups and one of a sulfonic acid salt group, a carboxylic acid salt group, and a quaternary ammonium salt group. The magnetic recording material prepared by using magnetic powder as the inorganic powder and crosslinking the binder is excellent in dispersion of the magnetic powder and smoothness of the surface. Therefore, the magnetic recording medium is excellent in magnetic properties, durability, and running properties.

Magnetic recording medium having a specified binder system

Growing community of inventors

Tokyo, Japan

Katsuya Nakamura