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:
May. 26, 1998
Filed:
Oct. 25, 1994
Applicant:
Inventors:
Herbert Peiffer, Mainz, DE;
Gunter Schloegl, Kelkheim, DE;
Assignee:
Hoechst AG, , DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ; B32B / ; B32B / ; B32B / ;
U.S. Cl.
CPC ...
428 349 ; 428 351 ; 428 357 ; 428 3692 ; 428331 ; 428515 ; 428516 ; 428523 ; 428910 ; 264345 ;
Abstract
A bowing value, expressed in terms of the curvature, of less than 10 mm is obtained by an additional heat treatment step at temperatures greater than 40.degree. C. to 80.degree. C. after the transverse stretching, the heat-setting and the cooling of the film. The polyolefin film contains a propylene polymer with at least 90% by weight of polypropylene or contains a polypropylene blend.