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:
Jul. 28, 2020
Filed:
Jun. 01, 2017
Bundesdruckerei Gmbh, Berlin, DE;
Covestro Deutschland Ag, Leverkusen, DE;
Andre Leopold, Berlin, DE;
Oliver Muth, Berlin, DE;
Michael Knebel, Berlin, DE;
Rainer Seidel, Berlin, DE;
Jens Ehreke, Berlin, DE;
Manfred Paeschke, Basdorf, DE;
Heinz Pudleiner, Krefeld, DE;
Cengiz Yesildag, Leverkusen, DE;
Klaus Meyer, Dormagen, DE;
COVESTRO DEUTSCHLAND AG, Leverkusen, DE;
Bundesdruckerei GmbH, Berlin, DE;
Abstract
The invention relates to a method for making a structure with at least a first polymer layer and a second polymer layer, each made from a polycarbonate polymer based on bisphenol A, and in between the first polymer layer and the second polymer layer an intermediate layer being arranged, comprising the following steps: a) the intermediate layer is applied at least on a partial region of the first polymer layer, b) optionally the intermediate layer is dried, c) the first polymer layer is coated on the side, on which the intermediate layer is arranged, with a liquid preparation comprising a solvent or a mixture of solvents and a polycarbonate derivative based on a geminally disubstituted dihydroxydiphenyl cycloalkane, the preparation covering the intermediate layer, d) optionally a drying step is made after step c), e) after step c) or step d), the second polymer layer is placed on the first polymer layer, covering the intermediate layer, f) the first polymer layer and the second polymer layer are laminated with each other under pressure, at a temperature from 120° C. to 230° C. and for a defined time.