Low-sealing, biaxially oriented polyolefin multilayer film, process for its production and its use

US5817412A · kind A · utility

Assignee

• Hoechst Trespaphan GmbH · DE

Inventors

• Harald Lohmann · Neunkirchen, DE
• Herbert Peiffer · Mainz, DE
• Detlef Busch · Saarlouis, DE

Key dates

• Filing date: Nov 22, 1996
• Grant date: Oct 6, 1998
• Expiry date: Nov 22, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31913
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A polyolefinic multilayer film comprises at least three layers BIT, wherein B is a polyolefinic base layer, I is an intermediate layer, and T is a top layer applied to the intermediate layer I. The intermediate layer I comprises at least 75% by weight, based on the weight of the intermediate layer I, of heat sealable polyolefins. The top layer T comprises at least 75% by weight, based on the weight of the top layer T, of heat sealable polyolefins. The minimum sealing temperature of the polyolefin of top layer T is at least 100.degree. C. and is greater than the minimum sealing temperature of the polyolefin of the intermediate layer I. The thickness of the top layer T is less than 0.4 .mu.m.