Polypropylene adhesive tape

US4716068A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Walter Seifried · Wiesbaden, DE
• Guenther Crass · Taunusstein, DE

Key dates

• Filing date: Jan 17, 1986
• Grant date: Dec 29, 1987
• Expiry date: Jan 17, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31913
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Disclosed is an adhesive tape based on a co-extruded, three-layer polypropylene base film which has been biaxially stretch-oriented in at least three stages and has been subjected on at least one side to corona treatment. The base film comprises a base layer and two covering layers. The base layer comprises polypropylene. The covering layer adjacent the adhesive layer includes polypropylene modified with a natural or synthetic resin having a softening point of about 70.degree. to 170.degree. C., and the other covering layer includes polypropylene modified with a diorganopolysiloxane. The new adhesive tape possesses high values of mechanical properties. The tape has good printability, and it does not contain an adhesion-promoting layer for the adhesive, nor a separating layer (release coat), since such layers are not required. The tape can also be processed without appreciable draw-off noises.