Patent · US Expired

Low temperature heat sealable biaxially oriented polypropylene films comprising propylene/butylene resin

US5811185A · kind A · utility

14Cited by

13References

18Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Michael Schreck · Frankfurt, DE
Gunter Schloegl · Kelkheim, DE
Klaus Thoeren · Wiesbaden, DE
Adolf Wilhelm · Wiesbaden, DE

Key dates

Filing date	Aug 3, 1995
Grant date	Sep 22, 1998
Priority date	—
Expiry date	Aug 3, 2015

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31913
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

This invention provides a polyolefinic multilayer film which has a base layer containing polypropylene and at least one outer layer. The outer layer contains at least 50% by weight of a propylene/butylene resin composition. The propylene/butylene resin composition has a low degree of crystallinity and is modified by a surface treatment, e.g. corona treatment. The surface treatment raises the minimum heat-sealing temperature to the range of 85.degree. to 110.degree. C. and unexpectedly reduces the film's tendency to block. The resulting multilayer film is useful in packaging.

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