Organic-optic recording tapes

Details Organic-optic recording tapes Organic-optic recording tapes

1994-05-26

1996-04-16

Ryan, Patrick J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

369100, 369283, 369284, 369289, 3692752, 3692754, 428 641, 428913, 428409, B32B 900

Patent

active

055080871

ABSTRACT:
An organic-optic recording tape of higher capacity and higher packing density of data. This tape comprises a backcoating layer, a base film coated on the backcoating layer, and a complex functional layer for writing, reading and erasing data. The complex functional layer is coated on the base film and selectively focused by laser beams of different powers outputted from a laser diode in order to write, read or erase data. This complex functional layer is made of a block polymer prepared by blending a thermoplastic elastomer and a viscoelastic transparent thermoplastic high-molecular resin or polymerizing them. Near infrared absorbing organic colorants are dispersed in the complex functional layer. The transparent thermoplastic resin has a glass transition temperature higher than that of the elastomer. The recording is effected by employing a laser beam of lower power capable of inducing thermal expansion of the elastomer and formation of a bump. The erasing is effected by employing a laser beam of higher power capable of inducing viscousness of the resin. The reading is effected by employing a laser beam of very lower power capable of causing reflectivity difference between the bump and the normal part of the complex function layer.

REFERENCES:
patent: 4161498 (1979-07-01), Bopp
patent: 4719615 (1988-01-01), Feyrer
patent: 4860273 (1989-08-01), Sawano
patent: 4879709 (1989-11-01), Clark
patent: 4889756 (1989-12-01), Barzynski
patent: 4937338 (1990-06-01), Flohr et al.
patent: 5013594 (1991-05-01), Mizumura et al.
patent: 5169744 (1992-12-01), Leenders et al.
patent: 5213955 (1993-05-01), Hamada et al.
Encyclopedia of Polymer Science and Engineering, vol. 2, pp. 390-434, John Wiley & Sons, 1989.

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