Kao Corporation

Koichi Naito

Shigeo Fujii

Yoshiaki Oshima

Yoshikazu Ogura

Toshiya Hagihara

Yuji Matsui

Koji Taira

Susumu Oishi

To provide a polishing composition capable of increasing polishing rate and reducing surface roughness, without causing surface defects on a surface of an object to be polished; and a polishing process for a substrate to be polished. [1] a polishing composition comprising water, an abrasive, an intermediate alumina, and a polycarboxylic acid having 4 or more carbon atoms with no OH groups or a salt thereof, wherein a content of the intermediate alumina is from 1 to 90 parts by weight, based on 100 parts by weight of the abrasive; and [2] a polishing process for a substrate to be polished, comprising polishing a substrate to be polished under conditions that a composition of a polishing liquid during polishing is the composition as defined in item [1] above.

Polishing fluid composition

Provided is a beverage e.g. tea, containing a high concentration of catechins and at the same time having an improved taste with alleviated bitterness and astringency and smooth throat-feel upon drinking. The beverage has the following non-polymer component (A), another non-polymer component (B), and component (C): (A) non-epi-catechins, (B) epi-catechins, (C) water-soluble polymers; and has, per 500 mL of the beverage, these components in amounts satisfying the following equations: (i) (A)+(B)=300 to 2500 mg; (ii) (A)=70 to 2250 mg; (iii) (A)/(B) (by weight)=0.25 to 9.0; and (iv) (C)/((A)+(B)) (by weight)=1/20 to 10/1.

Beverages containing catechins

A polishing composition comprising a chelating compound or a salt thereof; a partially esterified product and/or partially etherified product of a polyhydric alcohol compound; and water; a polishing composition comprising water, an abrasive, an intermediate alumina, and a chelating compound or a salt thereof, wherein the content of the intermediate alumina is from 1 to 50 parts by weight, based on 100 parts by weight of the abrasive; and a polishing composition comprising water, an abrasive, an intermediate alumina, a chelating compound or a salt thereof, and a partially esterified product and/or partially etherified product of a polyhydric alcohol compound, wherein the content of the intermediate alumina is from 1 to 50 parts by weight, based on 100 parts by weight of the abrasive. By using the polishing composition, the polishing rate can be increased, and the surface roughness can be lowered, without causing defects such as scratches and pits on the surface of an object to be polished.

Abrasive fluid compositions

A polishing composition comprising silica particles, water, and Fe salt and/or Al salt of a polyaminocarboxylic acid; a polishing process comprising applying the polishing composition; a process for manufacturing a magnetic disk substrate, comprising the step of polishing a substrate with the polishing composition; a magnetic disk substrate manufactured by applying the polishing composition.

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Tokyo, Japan

Koichi Naito