Magnetic recording disk

Details Magnetic recording disk Magnetic recording disk

1984-04-11

1985-04-30

Robinson, Ellis P.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

360134, 360135, 360136, 427128, 427131, 428143, 428172, 428212, 428216, 428220, 428332, 428335, 428336, 428480, 428483, 428533, 428694, 428695, 428900, 428910, G11B 570

Patent

active

045144524

ABSTRACT:
A magnetic recording disk is disclosed, which comprises (1) a three-layered laminate consisting of a core layer of a biaxially oriented polyolefin film which has a birefringence of not more than 0.01 and an amorphous-region orientation coefficient of not more than 0.2 and two outer layers of a biaxially oriented polyester film adhereed to the core layer, and (2) a magnetic layer formed on at least one side of the laminate. This magnetic recording disk undergoes only a slight dimensional change with a variation in humidity and temperature, and the dimensional change is isotropic in the plane.

REFERENCES:
patent: 3310421 (1967-03-01), Flowers
patent: 3900653 (1975-08-01), Riboulet
patent: 3983285 (1976-09-01), Riboulet
patent: 4067855 (1978-01-01), Miwa et al.
patent: 4138386 (1979-02-01), Motegi et al.
patent: 4198458 (1980-04-01), Mitsuishi
patent: 4223361 (1980-09-01), Zaitsu et al.
patent: 4348446 (1982-09-01), Mitsuishi
patent: 4411945 (1983-10-01), Akao

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