Method for producing a polycarbonate layered composite

US10723109B2 · kind B2 · utility

Assignees

• Covestro Deutschland AG · DE
• BUNDESDRUCKEREI GMBH · DE

Inventors

• Andre Leopold · Berlin, DE
• Oliver Muth · Berlin, DE
• Michael Knebel · Berlin, DE
• Rainer Seidel · Berlin, DE
• Jens Ehreke · Berlin, DE
• Manfred Paeschke · Wandlitz, DE
• Heinz Pudleiner · Krefeld, DE
• Cengiz Yesildag · Leverkusen, DE
• Klaus Meyer · Dormagen, DE

Key dates

• Filing date: Jun 1, 2017
• Grant date: Jul 28, 2020
• Expiry date: Apr 25, 2038

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31507
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

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.