Process for forming images using body with reversible fixable and temperature-variable light extinctions

US4695528A · kind A · utility

Assignee

• Wolfgang Dabisch · DE

Inventors

• Wolfgang H. Dabisch · Eltville am Rhein, DE
• Peter Kung · Jona, CH
• Siegfried Muller · Freising, DE
• Krishnamoorthy Narayanan · Oestrich-Winkel, DE

Key dates

• Filing date: Sep 28, 1982
• Grant date: Sep 22, 1987
• Expiry date: Sep 28, 2002

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S430/146
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

In order to be able, in a simple manner, to erase, by heating, data recorded on bodies with reversible, temperature-variable light extinctions, and then to be able to use the body anew for the recording of data, these bodies consists of at least one polymer material and/or resin matrix material (A) and at least one organic low-molecular substance (B), which is insoluble, at least partially, in the latter and which is contained therein as a dispersed second phase, whereby the pair of materials (A/B) possess variable light extinctions below a specific temperature (T.sub.0) in dependence on a previous heating above T.sub.0 and are so constituted that, upon being heated above a conversion temperature (T.sub.2) which lies above T.sub.0, and being cooled off subsequently to below T.sub.0, yields maximum light extinction; and, upon being heated in the state of maximum light extinction to a temperature (T.sub.1) which lies above T.sub.0 and below T.sub.2, and subsequent cooling off to below T.sub.0, yields light extinctions which become smaller with increasing temperature; and, upon being heated to a temperature between T.sub.1 and T.sub. 2 and subsequent cooling off to below T.sub.0, yiel…