Polyester film having specific surface properties

Details Polyester film having specific surface properties Polyester film having specific surface properties

1991-07-30

1993-12-21

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

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

428 64, 428 65, 428409, 428480, 428913, 430945, B32B 900

Patent

active

052719855

ABSTRACT:
This invention relates to a polyester film suited for use in optical recording medium. The polyester film of the present invention has a modulus of photoelasticity of not more than 0.9.times.10.sup.-3 mm.sup.2 /kgf, a maximum surface roughness Rt of not more than 100 nm and a mean interval Sm between adjacent surface projections of not less than 20 .mu.m, so that light scattering and interference are not caused, and optical strain is not generated even when a thermal stress or external force is exerted to the film. Thus, the polyester film of the present invention can be used as the supporting layer or cover layer of optical recording media such as optical cards, optical disks and optical recording tapes.

REFERENCES:
patent: 4719171 (1988-01-01), Ikenaga et al.
patent: 4899168 (1990-02-01), Osato et al.
patent: 4965307 (1990-10-01), Okabe et al.
patent: 5047278 (1991-09-01), Ono et al.

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