Polyester film and method for producing the same

Details Polyester film and method for producing the same Polyester film and method for producing the same

2006-04-11

2006-04-11

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

Stock material or miscellaneous articles

Magnetic recording component or stock

Magnetic recording media substrate

C428S831200, C428S840100, C428S847200, C428S847500, C428S847700, C428S141000, C428S458000, C428S480000, C428S900000, C977S726000

Reexamination Certificate

active

07026064

ABSTRACT:
The present invention provides a polyester film particularly useful as a base film for a magnetic recording medium such as cassette-type magnetic tape of a digital recording mode and a production process thereof. The polyester film is produced by irradiating UV light onto a surface of a film in a non-stretched stage or a stage prior to the completion of stretching to form fine protrusions on the surface. The fine protrusions on the film surface are specified by the ratio of 10-point average roughness Rz to center line average roughness Ra (Rz/Ra) on the surface (less than 20), the difference in concentration of carboxyl groups between the surface layer part and the inside of the film, and the number of fine protrusions.

REFERENCES:
patent: 5459019 (1995-10-01), Kato et al.
patent: 5523143 (1996-06-01), Hagemeyer et al.
patent: 5912063 (1999-06-01), Osawa et al.
patent: 6461726 (2002-10-01), Handa et al.

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