Kao Corporation

Toyo Ink Manufacturing Company

Hiroaki Kitayama

Shigeo Fujii

Toshiya Hagihara

Kyoichi Watanabe

Takamitsu Saito

Kazuo Oki

Minoru Sawai

Tamaki Miura

Hiroyuki Yoshida

Yoshiaki Oshima

Yoshinobu Ishikawa

Masaki Nomura

The burned composite metal oxide of the present invention is a burned composite metal oxide which is porous and particulate and which is obtained by subjecting a slurry comprising at least one metal oxide (a), at least one metal compound (b) and a solvent to spray granulation to obtain granules, and burning the granules, the metal oxide (a) selected from the group consisting of a transition metal oxide and an oxide of a metal belonging to 3B, 4B and 5B of a periodic table, the metal compound (b) selected from the group consisting of an alkali metal compound and an alkali earth metal compound, wherein the metal oxide (a) and the metal compound (b) are sparingly soluble in the solvent; the burning is conducted after a heat-maintaining step of heating the granules obtained by the spray granulation at a temperature in a range of &#xb1;200&#xb0; C. based on the decomposition temperature of the metal compound (b); and the metal compound (b) contains at least a nonmetallic element component desorbed in the heat-maintaining step.

Burned composite metal oxide and process for producing the same

The present invention provides a composite material for positive electrodes of lithium batteries, which provides a lithium battery having excellent high rate electrical discharge characteristics, has a sufficiently secured diffusion passage for Li, and has high conductivity, a process for producing the same, as well as a positive electrode and a battery using the composite material for positive electrodes of lithium batteries. The present invention relates to a composite material for positive electrodes of lithium batteries, comprising composite particles containing positive electrode active material particles and fibrous carbons, wherein the composite particles have a form in which the positive electrode active material particles are supported by the fibrous carbons.

Composite material for positive electrode of lithium battery

A method for manufacturing a substrate for a magnetic disk, including the steps of (a) polishing a substrate with a polishing composition A containing alumina abrasives having an average particle size of from 0.05 to 0.5 &#x3bc;m, and an oxidizing agent, and (b) polishing the substrate with a polishing composition B containing silica particles having an average particle size of from 0.005 to 0.1 &#x3bc;m; a substrate for a magnetic disk, obtainable by the method for manufacturing a substrate for a magnetic disk; and a substrate for a magnetic disk having the following surface properties of a long-wavelength waviness of 0.05 nm or more and 0.3 nm or less, and an AFM surface roughness of 0.03 nm or more and 0.2 nm or less. The substrate for a magnetic disk may be suitably used in the manufacture of a hard disk having a high recording density. Especially, a hard disk having a recording density of 50 G bits or more per square inch may be industrially manufactured.

Substrate for magnetic disk

A polishing composition comprising an abrasive and water, wherein the polishing composition has an index of degree of sedimentation of 80 or more and 100 or less; a process for producing a substrate comprising polishing a substrate to be polished using the above-mentioned composition; a process for preventing clogging of a polishing pad comprising applying the above-mentioned composition; a process for preventing clogging of a polishing pad comprising applying the above-mentioned composition to polishing with a polishing pad for a nickel-containing object to be polished; and a process for preventing clogging of a polishing pad comprising applying a composition comprising a hydrophilic polymer having two or more hydrophilic groups in its molecule and a molecular weight of 300 or more, or a compound capable of dissolving nickel hydroxide at a pH of 8.0, and water to polishing with a polishing pad for a nickel-containing object to be polished.

Polishing composition

A microwaviness reducing agent for polishing a substrate for a precision part, containing either a surfactant having two or more ionic hydrophilic groups, or a polycarboxylic acid compound having 2 to 15 total carbon atoms and having either OH group or groups or SH group or groups, or a salt thereof; a polishing composition for a substrate for a precision part, containing the microwaviness reducing agent, an abrasive and water; a polishing composition comprising water, an abrasive, an organic acid or a salt thereof, and a surfactant, wherein the organic acid is a polycarboxylic acid compound having 2 to 15 total carbon atoms and having either OH group or groups or SH group or groups, and wherein the surfactant has two or more ionic hydrophilic groups in its molecule and has a molecular weight of 300 or more; a method of reducing microwaviness of a substrate for a precision part; and a method for manufacturing a substrate for a precision part.

A polishing composition comprising 0.03 to 0.5% by weight of an organic acid or a salt thereof, an abrasive and water, wherein the abrasive has a surface potential of from &#x2212;140 to 200 mV; a roll-off reducing agent comprising an inorganic compound having a property of controlling a surface potential of an abrasive in a polishing composition, wherein a surface potential of the abrasive in a standard polishing composition is controlled to &#x2212;110 to 250 mV by the presence of the inorganic compound, wherein the standard polishing composition is prepared which comprises 20 parts by weight of an abrasive, the abrasive being high-purity alumina having AlOpurity of 98.0% by weight or more composed of &#x3b1;-type corundum crystal, 1 part by weight of citric acid, 78 parts by weight of water and 1 part by weight of an inorganic compound. The polishing composition or the roll-off reducing agent composition can be favorably used in polishing the substrate for precision parts.

A polishing composition comprising an abrasive, water and an organic acid or a salt thereof, wherein the composition has a specified viscosity of from 1.0 to 2.0 mPa&#xb7;s at a shearing rate of 1500 sand 25&#xb0; C.; a roll-off reducing agent comprising a Br&#xf6;nsted acid or a salt thereof, having an action of lowering viscosity so that the amount of viscosity lowered is 0.01 mPa&#xb7;s or more, wherein the amount of viscosity lowered is expressed by the following equation:(Amount of Viscosity Lowered)=(Viscosity of Standard Polishing Composition)&#x2212;(Viscosity of Roll-Off Reducing Agent-Containing Polishing Composition),wherein the standard polishing composition is prepared which comprises 20 parts by weight of an abrasive, said abrasive being high-purity alumina having AlOpurity of 98.0% by weight or more composed of &#x3b1;-type co-random crystal, 1 part by weight of citric acid, and 79 parts by weight of water; the roll-off reducing agent-containing polishing composition is prepared which comprises 20 parts by weight of an abrasive, said abrasive being high-purity alumina having AlOpurity of 98.0% by weight or more composed of &#x3b1;-type co-random crystal, 1 part by weight of citric acid, 78.9 parts by weight of water and 0.1 parts by weight of a roll-off reducing agent; and the viscosity is a viscosity at a shearing rate of 1500 sand 25&#xb0; C. The polishing composition can be favorably used in polishing the substrate for precision parts.

A pressure-sensitive adhesive prepared by emulsifying dispersing a monomer mixture containing at least 50% by weight, based on the total weight of the monomer mixture, of a long-chain alkyl (meth)acrylate with the alkyl having 9 to 13 carbon atoms in an aqueous surfactant solution to bring the monomer mixture to fine particles having an average diameter of not more than 2.0 &mgr;m and polymerizing the monomer mixture in the presence of a water-soluble polymerization initiator can provide a pressure-sensitive adhesive which possesses excellent moisture resistance, water resistance, weather resistance, and adhesion to a nonpolar adherend, such as a polyolefin plastic, and, at the same time, well-balanced tackiness properties.

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Wakayama, Japan

Hiroaki Kitayama