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:
Apr. 14, 2026
Filed:
Jul. 11, 2022
Covestro Deutschland Ag, Leverkusen, DE;
Heinz Pudleiner, Krefeld, DE;
Georgios Tziovaras, Neuss, DE;
Wieland Hovestadt, Leichlingen, DE;
Stefan Janke, Brüggen, DE;
Kira Planken, Goch, DE;
Covestro Deutschland AG, Leverkusen, DE;
Abstract
The invention relates to a multilayer structure (MS) comprising (SI) at least one first polymer layer (SI) comprising ≥95% by weight, preferably ≥98% by weight, particularly preferably ≥99% by weight, based on the total weight of the polymer layer (SI), of a polymer (PI) selected from the group consisting of a polycarbonate, a co-polycarbonate or mixtures thereof having a Vicat softening temperature≥149° C., preferably ≥160° C., further preferably ≥170° C.; more preferably ≥180° C., determined according to ISO 360:2004 (50N; 50°/h); (S2) at least one further polymer layer (S2) having a Vicat softening temperature<149° C., preferably ≥140° C., more preferably ≤130° C., determined according to ISO 306:2004 (50N; 50°/h), preferably in a range from 120° C. to 148° C.; (S3) optionally at least one third polymer layer (S3) having a Vicat softening temperature≥149° C., preferably ≥160° C., further preferably ≥170° C.; more preferably ≥180° C., determined according to ISO 306:2004 (50N; 50° h). The invention further relates to a process for producing a multilayer structure (MS) and to a security document comprising such a multilayer structure according to the invention.