Keil & Weinkauf
Optical recording medium
 An optical recording medium contains, on a base, one or more dyes and a polymer which forms liquid-crystalline phases. The information is written into the uniformly oriented liquid-crystalline polymer layer, for example by means of a laser. During this procedure, the polymer heats up locally to above a phase transition temperature. By cooling, the resulting change is frozen in the glass state. The information can be erased by applying an electric field and/or heating. The recording material permits high-contrast storage and possesses high sensitivity, good resolution and excellent stability. 
BASF Aktiengesellschaft
G C G G C
G11B C09K G11B G11B C09K
inventional inventional inventional inventional inventional
Helmut Guenter Friedrich Rudolf Matthias Hans-Werner Peter Karl-Heinz
Ringsdorf Baur Windscheid Kiefer Dust Schmidt Neumann Etzbach