Oriented polyolefin film with amorphous polymer, a process for its production and its use

US5573717A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Herbert Peiffer · Mainz, DE
• Ursula Murschall · Nierstein, DE
• Gunter Schloegl · Kelkheim, DE
• Frank Osan · Kelkheim, DE
• Thomas Dries · Bad Kreuznach, DE

Key dates

• Filing date: Mar 23, 1995
• Grant date: Nov 12, 1996
• Expiry date: Mar 23, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/249992
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The disclosed oriented polyolefin film contains at least one voided layer. The voided layer contains an amorphous void-initiating polymer which, after orienting, is present as a separate particle inside the void. In the process for producing the polyolefin film, a molten blend comprising an olefin polymer and the amorphous polymer is extruded through a die at an extrusion temperature above the glass temperature or Vicat softening point of the amorphous polymer, the resulting film is drawn off on one or more rollers, and is then subjected to stretch orientation, followed optionally by thermofixing and a surface treatment.