The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 29, 1987
Filed:
Jan. 17, 1986
Walter Seifried, Weisbaden, DE;
Guenther Crass, Taunusstein, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
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.