Multilayered film made of (meth)acrylate copolymer and polycarbonate

US7682698B2 · kind B2 · utility

Assignees

• Roehm GmbH · DE
• Senoplast Klepsch & Co., GmbH · AT

Inventors

• Klaus Schultes · Wiesbaden, DE
• Michael Wicker · Seeheim-Jugenheim, DE
• Klaus Albrecht · Mainz, DE
• Mona Rueppel · Weener, DE
• Gabriele Dassinger · Riedstadt, DE
• Eric Reinheimer · Groß-Zimmern, DE
• Johann Kappacher · Piesendorf, AT
• Andreas Hoellebauer · Zell am See, AT

Key dates

• Filing date: May 7, 2009
• Grant date: Mar 23, 2010
• Expiry date: May 7, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31786
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The invention relates to a multilayer film encompassing at least one upper layer a) and one middle layer b) composed of (meth)acrylate copolymers, and also a backing layer c) composed of polycarbonate, where the upper layer a) comprises a light stabilizer and is composed of a (meth)acrylate copolymer which can form semicompatible mixtures with the polycarbonate of the backing layer c), where a test specimen produced from a mixture composed of 20% by weight of (meth)acrylate copolymer and 80% by weight of polycarbonate has a tensile strain at break of at least 75% (ISO 527-2) at 23° C., the middle layer b) comprises a dye and, where appropriate, a light stabilizer, and is composed of an identical or different (meth)acrylate copolymer which can form semicompatible mixtures with the polycarbonate of the backing layer c), where a test specimen produced from a mixture composed of 20% by weight of (meth)acrylate copolymer and 80% by weight of polycarbonate has a tensile strain at break of at least 75% (ISO 527-2) at 23° C., and the backing layer c) is composed of polycarbonate which can, where appropriate, comprise up to 30% by weight of the material of the layers a) and b). The inventio…