Browse Prior Art Database

Film Forming Process

IP.com Disclosure Number: IPCOM000074696D
Original Publication Date: 1971-May-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Brown, EA: AUTHOR

Abstract

A coating 2 of a magnetic mixture consisting of magnetic iron oxide particles 3 dispersed in photopolymerizable binder 4 is deposited on transparent MYLAR* substrate 1. Coating 2 is dried by heating. Coating 2 is exposed to light radiation 20, such as ultraviolet radiation, through transparent substrate 1 for a time sufficient to polymerize binder 4. After exposure, the unpolymerized portion of coating 2 is washed away by a solvent thereby leaving a thin magnetic film 22 on substrate 1. The thickness of film 22 is dependent on the dimension of particles 3 which are generally chosen to be in the order of about 1 micron to yield a 1 micron-thick film. A substantially uniform volume of oxide particles 3 are distributed throughout polymerized magnetic film 22 thus formed.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Film Forming Process

A coating 2 of a magnetic mixture consisting of magnetic iron oxide particles 3 dispersed in photopolymerizable binder 4 is deposited on transparent MYLAR* substrate 1. Coating 2 is dried by heating. Coating 2 is exposed to light radiation 20, such as ultraviolet radiation, through transparent substrate 1 for a time sufficient to polymerize binder 4. After exposure, the unpolymerized portion of coating 2 is washed away by a solvent thereby leaving a thin magnetic film 22 on substrate 1. The thickness of film 22 is dependent on the dimension of particles 3 which are generally chosen to be in the order of about 1 micron to yield a 1 micron-thick film.

A substantially uniform volume of oxide particles 3 are distributed throughout polymerized magnetic film 22 thus formed.

A further possible modification is to produce coated tapes of permanent patterns, such as timing tracks and bit bars. Such patterns are produced by exposing coating 2 through a second tape containing the desired pattern inscribed thereon. * Trademark of E. I. du Pont de Nemours & Company

1

Page 2 of 2

2

[This page contains 2 pictures or other non-text objects]