Patent · US Expired

Heat sealable, biaxally oriented polypropylene film with improved barrier properties

US6777067B1 · kind B1 · utility

16Cited by

9References

30Claims

0Family size

Assignee

Hoechst Trespaphan GmbH · DE

Inventors

Angela Speith-Herfurth · Egelsbach, DE
Robert Hansohn · Kirkel, DE
Detlef Schumann · Kiedrich, DE
Frank Ernst · Cleveland Heights, US

Key dates

Filing date	Sep 5, 2000
Grant date	Aug 17, 2004
Priority date	—
Expiry date	Sep 5, 2020

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31913
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to a multi-layer, sealable biaxially oriented polypropylene film consisting of a base layer and at least one sealable covering layer. The base layer contains between 1 and 15 weight % of a resin with a mean molecular weight Mw of between 600 and 1,500 and between 1 and 6 weight % of a wax with a mean molecular weight Mn of between 200 and 700. The n-heptane insoluble part of the polypropylene of the base layer has a chain isotactic index of at least 95%, as measured by 13C-NMR spectroscopy. The invention also relates to a method for producing said film and to its use.

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