The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 29, 2001
Filed:
Sep. 02, 1999
Applicant:
Inventors:
Joerg Hellmann, Mainz, DE;
Gottfried Hilkert, Saulheim, DE;
Assignee:
Mitsubishi Polyester Film GmbH, Wisebaden, DE;
Primary Examiner:
Int. Cl.
CPC ...
B32B 7/00 ; B32B 2/718 ; B32B 2/720 ; B32B 2/736 ; B32B 3/130 ;
U.S. Cl.
CPC ...
B32B 7/00 ; B32B 2/718 ; B32B 2/720 ; B32B 2/736 ; B32B 3/130 ;
Abstract
The invention relates to a three-layer, biaxially oriented polyester film which has better abrasion properties than prior art films, together with very good electromagnetic properties. The structure on the two sides of the film in composed of at least one base layer B and, applied to this base layer, outer layers A and C, wherein the outer layer A has a roughness gas flow greater than 1000 sec and less than 2000 sec, and the outer layer C has a roughness profile gas flow of less than 600 sec. The invention further relates to a process for producing the film, and to its use as a magnetic tape film.