Memorex Corporation

Other

Unisys Corporation

Zorro Stefanini

Duncan W Frew

Leo Di Ricco

Edward A Schnee

The invention is concerned with a method and apparatus for uniformly depositing a solid lubricant coating on a data storage disc. The method comprises passing the entire disc, in horizontal orientation with a first side thereof facing downwardly, through a vertically extending zone having a lubricant in vapor form streaming upwardly therein while maintaining the disc at a temperature such that the lubricant condenses on contact therewith and while controlling the time of residence of the disc in the zone such as to provide a desire thickness for the coating. The disc is rotated about its center as it passes through the zone at a rate selected to ensure uniformity of deposition of the lubricant on the first side of the disc. The orientation of the disc is reversed so that its second side faces downwardly. The entire disc is passed in horizontal orientation with the second side downward through a vertically extending zone having a lubricant in vapor form streaming upwardly therein while the disc is maintained at a temperature such that the lubricant condenses on contact therewith and while the time of residence of the disc in the zone is controlled such as to provide a desired thickness for the coating. The disc is rotated about its center as it passes through the zone at a rate selected to ensure uniformity of deposition of the lubricant on the second side of the disc. The resultant product is a very uniformly coated disc and this is accomplished without the use of a solvent for the lubricant.

Method for uniform deposition of solid lubricant on rigid data storage

A magnetic coating composition is disclosed of the type having magnetic particles dispersed in a resin binder. The improvement comprises the use of a solvent system including a dibasic ester wherein the solvent system has an initial Hansen three-dimensional solubility parameter range of approximately 10.5 to 11.0 and a Hansen three-dimensional solubility parameter range of approximately 9.3 to 10.0 after approximately 99% of the solvent has been evaporated from the binder.

Preparation of magnetic coating

The present invention is a method to disperse fine solids in a resin binder matrix by use of a sand mill having non-metallic discs and containing zirconium oxide milling media. The method of the invention will disperse the fine solids without reduction of the size of the fine solids or contamination to the dispersion by fines of the zirconium oxide milling media.

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San Jose, CA, United States of America

Zorro Stefanini