Patent · US Expired

Biaxially oriented polyester film having more than one layer, process for its production, and its use as magnetic tape film

US6551686B1 · kind B1 · utility

5Cited by

15References

20Claims

0Family size

Assignee

Mitsubishi Polyester Film GmbH · US

Inventors

Joerg Hellmann · Mainz, DE
Gottfried Hilkert · Saulheim, DE
Wolfram Goerlitz · Wiesbaden, DE

Key dates

Filing date	Mar 31, 1999
Grant date	Apr 22, 2003
Priority date	—
Expiry date	Mar 31, 2019

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31786
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

The invention relates to a biaxially oriented polyester film which has three layers and which, together with very good electromagnetic properties compared with prior art films, has improved abrasion properties. The two sides of the film are built up from at least one base layer B and, applied to this base layer, outer layers A and C, where these outer layers have a defined number of elevations of defined height. The invention also relates to a process for producing the film and to its use as magnetic tape film.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.