Patent · US Expired

Biaxially oriented polyester film which is matt on one side and has characteristic shrinkage properties, process for its preparation and its uses

US6913817B2 · kind B2 · utility

6Cited by

16References

24Claims

0Family size

Assignee

Mitsubishi Polyester Film GmbH · US

Inventors

Oliver Klein · Saarlouis, DE
Herbert Peiffer · Mainz, DE
Matthias Konrad · Kriftel, DE

Key dates

Filing date	Jan 26, 2004
Grant date	Jul 5, 2005
Priority date	—
Expiry date	Jan 26, 2024

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31794
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

Biaxially oriented polyester films which have a polyester-containing base layer (B) and a matt overlayer (A), and are characterized by the following features: a) the transverse shrinkage of the film is between 1 and 2.3%, b) the transverse linear expansion of the film during thermo-mechanical analysis is smaller than or equal to 0.2%, c) the matt overlayer comprises particles, preferably SiO2, whose median diameter is from 2 to 10 μm and whose SPAN98 is smaller than or equal to 2, and d) the matt overlayer (A) comprises a polyester which has from 4 to 30 mol % of isophthalic acid units are notable in particular for low opacity, high transparency and low gloss of the overlayer (A), and are therefore suitable as flexible packaging films and for the purposes of hot lamination.

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