Patent · US Expired

Biaxially oriented film having high scratch and abrasion resistance

US4751139A · kind A · utility

9Cited by

7References

12Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Hartmut Hensel · Schlangenbad, DE
Hermann Dallmann · Wiesbaden, DE
Werner Schaefer · Hofheim, DE

Key dates

Filing date	Feb 19, 1986
Grant date	Jun 14, 1988
Priority date	—
Expiry date	Feb 19, 2006

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31786
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A biaxially oriented and heat set film having improved abrasion resistance is described, whose distinguishing characteristics are that it has a density of more than 1.38 g/cm.sup.3 and that the following relationship exists between the orientation birefringence (.DELTA.n), the reduced specific viscosity (RSV), and the temper peak (Tp) of the film: EQU RSV-.vertline..DELTA.n.vertline.-Tp/250.gtoreq.0 EQU with.vertline..DELTA..vertline.=.vertline.n.sub.MD -n.sub.TD .vertline.. In addition, a process for manufacturing the abrasion resistant film is disclosed.

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