Optical information recording card using phase separation of pol

Details Optical information recording card using phase separation of pol Optical information recording card using phase separation of pol

1987-07-15

1989-05-30

Herbert, Thomas J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

346 76L, 3461351, 428336, 428421, 428463, 428913, 430945, B32B 516, B32B 2706

Patent

active

048350486

ABSTRACT:
An information recording card using a semiconductor laser beam for writing and reading information. The card comprises a recording layer formed on one side of a card substrate and a light absorbing layer closely interposed between the substrate and the recording layer. The material of the recording layer is a polymer blend which comprises a copolymer of vinylidene fluoride and at least one F-containing comonomer, preferably hexafluoroacetone, and an acylic or methacylic ester polymer and which exhibits phase separation by heating. The light absorbing layer is for efficiently absorbing laser light used for recording and transforming it into heat energy. A good embodiment of the light absorbing layer is a film of Bi or Te, and another good embodiment is a thin layer of a resin composition containing fine particles of at least one of Bi, Te and C dispersed in a thermoplastic or thermosetting resin.

REFERENCES:
patent: 4141873 (1979-02-01), Dohany
patent: 4357616 (1982-11-01), Terao et al.
patent: 4617350 (1986-10-01), Maeda et al.
patent: 4711996 (1987-12-01), Drexler
English translation of Japanese Pat. No. 61-27910, 15 pages, published Aug. 17, 1987.

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