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:
Sep. 07, 1993
Filed:
Dec. 20, 1990
Applicant:
Inventors:
Hartmut Hensel, Klagenfurth, AT;
Peter Dinter, Oestrich-Winkel, DE;
Theo Grosse-Kreul, Wiesbaden, DE;
John D Gribbin, Schlangenbad, DE;
Assignee:
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ; G11B / ;
U.S. Cl.
CPC ...
428480 ; 4286 / ; 428900 ; 428910 ; 4286 / ; 2041921 ;
Abstract
The biaxially stretch oriented, corona-treated polyester film, in particular polyethylene terephthalate film, is suitable as a base film for magnetic coatings. It exhibits the following features: at least one of its two surfaces exhibits a surface tension of at least 43 mN/m without an adhesion promoter having been added; the modulus of elasticity in the machine direction and/or transverse direction is greater than 5800 N/mm.sup.2 ; and the refractive index perpendicular to the film plane is less than or equal to 1.4900.