Polyester film and recording tape

Details Polyester film and recording tape Polyester film and recording tape

2005-08-30

2005-08-30

Watkins, III, William P. (Department: 1772)

Stock material or miscellaneous articles

Structurally defined web or sheet

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

C428S690000, C428S690000, C428S690000, C428S690000, C428S690000, C428S690000, C428S141000, C428S143000, C428S480000, C428S481000, C428S147000

Reexamination Certificate

active

06936331

ABSTRACT:
A polyester film comprising a coating layer which comprises organic fine particles and organic compounds on one-side surface of the polyester film, the weight ratio of the organic fine particles to the organic compounds in the coating is 1:0.2 to 1:5.0, the diameters of surface protrusions on the coating surface are 20 to 60 nm, the number of surface protrusions on the surface of the coating layer is 3 million to 100 million per square millimeter, and the surface roughness Ra of the coating surface is 0.5 to 1.9 nm, is suitable as a base film of a recording medium having excellent image quality and excellent durability without shaving an MR head.

REFERENCES:
patent: 5306538 (1994-04-01), Kurihara et al.
patent: 5830557 (1998-11-01), Hayashi et al.
patent: 6242077 (2001-06-01), Tojo et al.
patent: 6309765 (2001-10-01), Suekane et al.
patent: 0 504 416 (1992-09-01), None
patent: 0 916 484 (1999-05-01), None
patent: 0 959 097 (1999-11-01), None

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