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AssigneeNissan Chemical Industries, Ltd.
InventorsToshio Kasai, Kiyomi Ema, Isao Ota, Tohru Nishimura
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Production of an alumina powder characterized by having a single or multiple crystal structure selected from the group consisting of γ, δ and θ-forms, a primary particle size of 10 to 50 nm, a mean secondary particle size of 100 to 500 nm, and a granular primary particle shape, or an alumina powder characterized by having an a-form crystal structure, a primary particle size of 60 to 150 nm, a mean secondary particle size of 200 to 500 nm, and a granular primary particle shape, using as a raw material an alumina hydrate comprising rectangular plate-like primary particles having a boehmite structure and having a length of one side of 10 to 50 nm; and preparation of a polishing composition comprising the alumina powder, water and a polishing accelerator.
A process for producing a granular:
A polishing composition for an aluminum disk, comprising an alumina abrasive, water and a polishing accelerator, wherein said alumina is a granular alumina powder having a single or multiple crystal structure selected from the group consisting of γ, δ and θ-forms, a primary particle size of 10 to 50 nm, and a mean secondary particle size of 100 to 500 nm.
A process for producing a granular alumina powder having an α-form crystal structure, a primary particle size of 60 to 150 nm, and a mean secondary particle size of 200 to 500 nm, comprising:
A polishing composition for an aluminum disk, comprising an alumina abrasive, water and a polishing accelerator, wherein said alumina is a granular alumina powder having an α-form crystal structure, a primary particle size of 60 to 150 nm, and a mean secondary particle size of 200 to 500 nm.
Dependencies are inferred from the claim text.