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:
Sep. 12, 1995
Filed:
Mar. 01, 1994
Applicant:
Inventors:
Assignee:
Wolff Walsrode Aktiengesellschaft, Walsrode, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428323 ; 428 367 ; 428349 ; 428480 ; 428516 ; 428520 ; 428910 ;
Abstract
The invention relates to a multilayer composite film consisting of a surface layer A, a gas barrier layer C, a heat sealing layer D and, optionally, adhesive or coupling layers B, the individual layers being arranged as follows in the composite film: A a biaxially stretched, white opaque polypropylene film, B an adhesive or coupling layer, C a gas barrier layer with a permeability to oxygen of at most 30 Ncm.sup.3 /m.sup.2 d bar (23.degree. C./0% relative humidity), B an adhesive or coupling layer, D a heat sealing layer, layers A and C optionally being interchangeable.