Polishing composition

a technology of composition and polishing, applied in the field of polishing composition, can solve the problems of insufficient reduction of roll-off, and increased requirements of surface qualities of the substrate after polishing,

Inactive Publication Date: 2007-03-01
KAO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, even for the manufacturing step of a magnetic disk substrate, the necessary requirements of the surface qualities of the substrate after polishing have become more severe every year.
WO 98/21289 discloses a polishing composition containing an oxyalkylene alkyl sulfate, but the reduction in roll-off cannot be said to be sufficient.
JP2004-179294 A discloses a polishing composition containing an aromatic sulfonic acid

Method used

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examples

[0070] The following examples further describe and demonstrate embodiments of the present invention. The examples are given solely for the purposes of illustration and are not to be construed as limitations of the present invention.

[0071] Polishing was evaluated with a Ni—P-plated aluminum alloy substrate having a thickness of 1.27 mm, an outer diameter of 95 mm and an inner diameter of 25 mm as a substrate to be polished, wherein the substrate was previously roughly polished with a polishing composition containing an alumina abrasive to adjust its Ra to 1 nm.

experimental examples 1 to 21

[0098] Polishing was carried out using the above substrate to be polished and the following polishing composition, and polishing rate and waviness were evaluated.

[Preparation of Polishing Composition]

[0099] To ion-exchanged water were added given amounts of sulfuric acid (commercially available from Wako Pure Chemical Industries, Ltd., special grade), aqueous hydrogen peroxide (35% by weight product, commercially available from ASAHI DENKA KOGYO K.K.), and a surfactant (commercially available from Kao Corporation or commercially available from Tokyo Kasei Reagent) as shown in Table 3, while thoroughly mixing. Thereafter, an aqueous slurry of a colloidal silica (silica having an average primary particle size (D50): 12 nm, D90: 26 nm, silica concentration: 25% by weight, pH=10) was added thereto, and the mixture was stirred again, to give a polishing composition. For each of the resulting polishing composition, the pH was determined.

[Polishing Conditions]

[0100] Polishing processin...

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Abstract

A polishing composition containing a silica, an acid, a surfactant, and water, wherein (a) the acid has solubility in water at 25° C. of 1 g or more per 100 g of an aqueous saturated solution; (b) the surfactant is a sulfonic acid represented by the formula (1) or (2), or a salt thereof; and (c) the polishing composition has a pH of a specified range; and a polishing process of a substrate using the polishing composition are provided. The polishing composition is suitably used, for example in polishing a substrate for disk recording media such as magnetic disks, optical disks and opto-magnetic disks.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a polishing composition, a polishing process for a substrate, and a method for manufacturing a substrate. BACKGROUND OF THE INVENTION [0002] Recently, miniaturization of memory hard disk drives and high storage memory capacity for memory hard disk drives have been demanded. In order to increase the recording density, it has been urged to lower the flying height of a magnetic head and to reduce the unit recording area. In addition, even for the manufacturing step of a magnetic disk substrate, the necessary requirements of the surface qualities of the substrate after polishing have become more severe every year. In order to satisfy the lowering of the flying height of the magnetic head, surface roughness, microwaviness, and projections have been required to be reduced. In addition, in order to increase the recording area per single hard disk, planarization has been required even to an edge portion of the circumference of t...

Claims

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Application Information

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IPC IPC(8): B24D3/02B24B7/30
CPCC09G1/02
Inventor YAMAGUCHI, NORIHITO
Owner KAO CORP
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