Patent · US Expired

Magnetic disk and method of making same

US4710424A · kind A · utility

6Cited by

14References

3Claims

0Family size

Assignee

International Business Machines Corporation · US

Inventors

Upali Bandara · Leimen, DE
Holger Hinkel · Böblingen, DE
Werner Steiner · Schrobenhausen, DE
Gerhard Trippel · Sindelfingen, DE

Key dates

Filing date	Oct 24, 1985
Grant date	Dec 1, 1987
Priority date	—
Expiry date	Oct 24, 2005

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31544
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

The magnetic disk contains on a disk substrate a magnetic layer comprising a binder, magnetic particles and abrasion-resistant particles, the abrasion-resistant particles being enveloped with a layer intensifying the bond between binder and abrasion-resistant particles. The enveloping layer either has a large specific surface and consists e.g. of SiO.sub.2 /Al.sub.2 O.sub.3 produced by processing the particles with an alkali metal silicate solution and an aluminum sulphate solution, or it is chemically bonded to the binder by enveloping the particles with poly(tetrafluroethylene) and coupling the latter, via an amino bridge to the binder, e.g. an epoxide resin. The magnetic disk according to the invention minimizes the abrasion of the magnetic layer as well as the damaging of the magnetic layer and of the magnetic head by knocked-out abrasion-resistant particles.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.