Optical data storage medium comprising a chromophore/polymer information layer

• US 4,728,724 A
• Filed: 04/08/1985
• Issued: 03/01/1988
• Est. Priority Date: 04/08/1985
• Status: Expired due to Fees

• Current Assignee: Board of Trustees of The University of Alabama (University of Alabama System)
• Original Assignee: Hoechst Celanese Corporation (Sanofi )
• Inventors: Kuder, James E., Besso, Michael M., Jones, R. Sidney Jr.
• Primary Examiner(s): Michl, Paul R.
• Assistant Examiner(s): Hamilton, Cynthia
• Application Number:
  US06/720,605
• Time in Patent Office: 1,058 Days
• Field of Search: 430/270, 430/286, 430/945, 430/19, 430/21, 430/322, 346/76 L, 346/135.1, 369/284, 525/420.5, 524/100, 524/606, 8/516
• US Class Current: 430/19
• CPC Class Codes: G11B 7/244 comprising organic materials only
• CPC Class Codes: G11B 7/245 containing a polymeric component
• CPC Class Codes: G11B 7/252 of layers other than recording layers
• CPC Class Codes: G11B 7/253 of substrates
• CPC Class Codes: G11B 7/2531 comprising glass
• CPC Class Codes: G11B 7/2532 comprising metals
• CPC Class Codes: G11B 7/2533 comprising resins
• CPC Class Codes: Y10S 430/146 Laser beam

Abstract

Provide is an optical data storage medium comprising a chromophore/polymer composition information layer, wherein the polymer and chromophore are chemically bound so as to improve chromophore/polymer compatibility. If necessary, the chromophore or the polymer may be modified to improve their interaction. When modification is desired, it is preferred to modify the polymer so as not to disturb the chromophore structure, which is generally selected for its absorption features. The interaction between the chromophore and polymer can be either covalent on non-covalent. The overall result is an information layer having improved chromophore/polymer compatibility.

Claims

1. A method of erasing a deformation information pattern of an optical information medium, which deformation pattern is formed in a film deposited on a substrate and with said erasing being achieved by heating or imparting energy to said film, the improvement which comprises said film being comprised of a polymer and a tetracyano quinonedimethane chromophore, with the chromophore being chemically bound to the polymer.

2. A readable information medium comprising a thermally stable substrate having coated thereon a layer comprising an information track comprised of a succession of spaced pits, said layer being comprised of a dimer acid polyamide polymer and a chromophore which is comprised of a functional moiety selected from the group consisting of a triazine, sulfate ester of beta-hydroxyethylsulfone, pyrimidine, quinoxaline, benzthiazole and pyridazone functional moiety, which chromophore is chemically bound to the polymer.

3. A method of recording information in a thin film deposited on a substrate by irradiating the film with a laser beam in accordance with said information to form pits in the film, the improvement which comprises said film being comprised of a dimer acid polyamide polymer and a chromophore which is comprised of a functional moiety selected from the group consisting of a triazine, sulfate ester of beta-hydroxyethylsulfone, pyrimidine, quinoxaline, benzthiazole and pyridazone functional moiety and, with the chromophore being chemically bound to the polymer.

4. A method of erasing a deformation information pattern of an optical information medium, which deformation pattern is formed in a film deposited on a substrate and with said erasing being achieved by heating or imparting energy to said film, the improvement which comprises said film being comprised of a dimer acid polyamide polymer and a chromophore which is comprised of a functional moiety selected from the group consisting of a triazine, sulfate ester of beta-hydroxyethylsulfone, pyrimidine, quinoxaline, benzthiazole and pyridazone functional moiety and, with the chromophore being chemically bound to the polymer.

5. A medium for storage of optical information comprising a polymeric information layer, the improvement which comprises said polymeric information layer comprising a chromophore which is comprised of a triazine, sulfate ester of beta-hydroxyethylsulfone, pyrimidine, quinoxaline, benzthiazole or pyridazone functional moiety, which is chemically bonded to a dimer acid polyamide polymer, wherein the dimer acid polyamide polymer is modified to have pendant reactive moieties to provide sites to interact chemically with the chromophore, with the pendant moieties being a dihydroxycarbazole, imidizoline, pyridine, imidazole, thiolate or carboxylate moiety.