Coextruded, biaxially oriented polyester film for metallizing, its use and process for its production

US6214440A · kind A · utility

Assignee

• Mitsubishi Polyester Film GmbH · US

Inventors

• Herbert Peiffer · Mainz, DE
• Richard L. Davis · Wiesbaden, DE
• Joerg Hellmann · Mainz, DE

Key dates

• Filing date: Oct 28, 1999
• Grant date: Apr 10, 2001
• Expiry date: Oct 28, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31786
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The invention relates to a biaxially oriented polyester film which, after metallization, has low oxygen permeation and good adhesion to the metallization, and is composed of at least one base layer B and, applied to this base layer, at least one layer A, where this layer A PA1 i) has, per mm.sup.2 of film surface, a number N of elevations whose respective heights h and diameters d are correlated by the following equations: EQU log N/mm.sup.2 <A.sub.h -B.sub.h *log h/.mu.m, 0.05 .mu.m<h<1.0 .mu.m (1) wherein A.sub.h =1.4; B.sub.h =2.5 EQU log N/mm.sup.2 <A.sub.d -Bd*log d/.mu.m, 0.2 .mu.m<d<10.0 .mu.m (2) wherein A.sub.d =3.4; B.sub.d =2.4 and PA1 ii) has a copolyester coating derived from isophthalic acid and a sulfomonomer.