Kao Corporation

Yuichi Honma

Ryoichi Tamaki

Hirotaka Sasaki

Takashi Mukai

Shigeaki Takashina

Kouji Taira

A polishing composition is provided containing an abrasive having an average particle size of from 1 to 30 nm and water, wherein the abrasive has a packing ratio of from 79 to 90% by weight; a method for manufacturing a substrate, including the steps of introducing the above polishing composition between a substrate and a polishing pad, and polishing the substrate, while contacting the substrate with the polishing composition; and a method for reducing scratches of a substrate to be polished, including the step of polishing the substrate to be polished with the above polishing composition. The polishing composition is suitable for polishing substrates for precision parts including, for example, substrates for magnetic recording media, such as magnetic disks, and opto-magnetic disks, photomask substrates, optical disks, optical lenses, optical mirrors, optical prisms and semiconductor substrates, and the like.

Polishing composition

The invention provides an additive for heated asphalt that can further improve a peeling prevention effect between asphalt and aggregates. The invention relates to an additive which is added to heated asphalt containing a particular gallic acid ester with or combination of gallic acid and an alcohol.

Additive for heating asphalt

Provided is, particularly, a cationic asphalt emulsion composition which is scarcely affected by temperature during paving and by the characteristics of the aggregates to be used, can secure a sufficient time required to mix aggregates and enables slurry fluidity suitable for paving. The asphalt emulsion composition contains asphalt and water, the composition comprising kraft lignin (A) having a molecular weight of 4000 to 60000 and a specific polyamine (B) in each specific ratio to the asphalt emulsion composition.

Asphalt emulsion composition

The present invention provides a stabilizer for asphalt emulsion by which asphalt emulsion having a good chemical stability and being excellent in stationary stability and storage stability can be obtained. A polyoxyethylene adduct compound having a terminal group A selected from a C alkyl group etc., a terminal group B selected from C alkyl group etc., and 130 to 500 oxyethylene groups on the average for bonding the terminal groups A and B is used as a stabilizer for asphalt emulsion.

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Wakayama, Japan

Yuichi Honma