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:
Nov. 15, 2022
Filed:
Sep. 19, 2018
Amcor Flexibles Singen Gmbh, Singen, DE;
AMCOR FLEXIBLES SINGEN GMBH, Singen, DE;
Abstract
Composite film () for closing a container () by sealing the composite film () against a circumferential sealing surface () of the container () or of a cap ring () to be connected to the container (). The composite film () comprises an outer support layer () made of a metal film and an inner multilayer membrane () laminated to the outer support layer () using a bonding layer (). The membrane () has a consecutive layer structure from the outside to the inside consisting of a backbone layer () made of polypropylene, an intermediate layer () made of a partially crystalline polyamide and a cohesively breakable peeling layer () made of polypropylene, polyethylene and talc, wherein between the intermediate layer () and the backbone layer () as well as between the intermediate layer () and the peeling layer () there is arranged a tie layer () made of a maleic acid anhydride grafted polypropylene. The membrane has further an innermost sealing layer () made of a random copolymer comprising monomers of propylene, ethylene and butylene, wherein the random copolymer is grafted with maleic acid anhydride. The softening point of the sealing layer () lies at least between 15 and 25° C. lower than that of the tie layers (). A use and a method of producing said composite film () are also disclosed.