Optical information recording card using polymer blend as record

Details Optical information recording card using polymer blend as record Optical information recording card using polymer blend as record

1987-02-12

1989-07-25

Michl, Paul R.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Radiation sensitive composition or product or process of making

430270, 430290, 430944, 430945, 428421, 346 76L, 3461351, G01D 1534, G03C 194, G03C 172

Patent

active

048513237

ABSTRACT:
The invention relates to an information recording card using a semiconductor laser beam for writing and reading information. The card has a recording layer formed on a card substrate so as to closely cover at least a selected surface area of the substrate and may have a reflective metal layer on the back side of the recording layer. The material of the reacording layer is a polymer blend which exhibits phase transition and resultant changes in light transmittance and reflectance by heating and which is either a binary polymer blend of a vinylidene fluoride (VDf) base polymer, either PVDF or a copolymer of VDF and another F-containing monomer such as TFE, and an acrylic or methacrylic polymer represented by PMMA or a ternary copolymer comprising a vinyl ester polymer in addition to the components of the binary polymer blend. The thermally caused phase transition is reversible by slow cooling in the case of the binary polymer blend but is irreversible in the case of the ternary polymer blend.

REFERENCES:
patent: 4141873 (1979-02-01), Dohany
patent: 4357616 (1982-11-01), Terao et al.
patent: 4463083 (1984-07-01), Kitajima et al.
patent: 4598393 (1986-07-01), Pierce et al.
patent: 4711996 (1987-12-01), Drexler
"Optical Recording of Refractive-Index Patterns in Doped Poly-(Methylmethacrylate") Films, by H. Franke, vol. 23, #16, Applied Optics, 8/15/84.

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