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AssigneeBASF SE
InventorsKarl-Heinz Etzbach, Peter Neumann, Matthias Dust, Helmut Ringsdorf, Hans-Werner Schmidt, Guenter Baur, Friedrich Windscheid, Rudolf Kiefer
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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.
An optical recording medium which possesses, on a base or between two supports, a layer comprising a polymer which forms liquid-crystalline phases and contains one or more dyes wherein the dye is chemically bonded, via a spacer, to the polymer.
Dependencies are inferred from the claim text.