Polyformals as a coextrusion protective layer on polycarbonate

US7691477B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Helmut-Werner Heuer · Krefeld, DE
• Rolf Wehrmann · Krefeld, DE
• Sylvia Braun · Duisburg, DE
• Claus Rüdiger · Krefeld, DE
• Marco Roelofs · Krefeld, DE
• Wolfgang Nising · Sankt Augustin, DE
• Siegfried Anders · Recklinghausen, DE
• Jurgen Rohner
• Rudiger Gorny · Dorpsstraat, US
• Ralf Hufen · Duisburg, DE

Key dates

• Filing date: Oct 6, 2005
• Grant date: Apr 6, 2010
• Expiry date: Aug 19, 2026

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31855
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A multi-layer article is disclosed. The article contains a base layer that contains at least one thermoplastic resin and a second layer containing a thermoplastic (co)polyformal superimposed over the base layer. The (co)polyformal conforms to formulae (1a) or (1b),in which O-D-O and O-E-O independently denote a diphenolate group, -D- and -E- independently denote an aromatic group having 6 to 40 carbon atoms, k is a whole number from 1 to 1500, o stands for numbers from 1 to 1500, and m is z/o and n is (o-z)/o wherein z is 0 to o.