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PARYLENE COATINGS TO PROTECT OPTICAL DISK RECORDING MEDIA

IP.com Disclosure Number: IPCOM000025444D
Original Publication Date: 1985-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 61K

Publishing Venue

Xerox Disclosure Journal

Abstract

The Tellurium (Te) based optical disk requires protection since Te is known to oxidize in the presence of oxygen and humidity. The resulting oxide has substantially different writing and reading properties. Parylene is considered as a passivation agent since it is widely used to protect printed circuit boards, hybrid boards and ferrites. Parylene coatings have excellent chemical resistance, purity gas barrier properties, freedom from pinholes, and high dielectric strength.

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XEROX DISCLOSURE JOURNAL

PARYLENE COATINGS TO PROTECT OPTICAL DISK RECORDING MEDIA U.S. CI. 365/126 Roberta M. Fay

Proposed Classification

Int. CI. Gllc 11/46

The Tellurium (Te) based optical disk requires protection since Te is known to oxidize in the presence of oxygen and humidity. The resulting oxide has substantially different writing and reading properties. Parylene is considered as a passivation agent since it is widely used to protect printed circuit boards, hybrid boards and ferrites. Parylene coatings have excellent chemical resistance, purity gas barrier properties, freedom from pinholes, and high dielectric strength.

Parylene is the name for a group of highly crystalline, straight chain polymers developed and marketed by Union Carbide. Because the chernical reaction to form the polymer actually occurs on the surface, the coating develops uniformly across edges, points and holes. Since the substrate remains stationary at room temperatures, neither mechanical nor thermal stresses build up. Parylene coatings have excellent mechanical durability under impact loads although under shear loads, they can peel off sharp edges. Parylene has been investigated as a dry film lubricant because of its very low coefficient of static and dynamic friction.

The procedure for configuring an optical disk/backer plate:

1) Clean data disk substrate.

2) Coat data disk with Te (mask disk edges during deposition).

3) Apply parylene coating.

4) Mix epoxy resin and hardener and...