Impact-resistant methacrylate protective layer for polycarbonate, containing UV absorber

US5063112A · kind A · utility

Assignee

• Rohm GmbH Chemische Fabrik · DE

Inventors

• Heinz Gross · Lutherstadt Eisleben, DE
• Jens-Dieter Fischer · Darmstadt, DE
• Werner Siol · Pfungstadt, DE
• Thomas Sufke · Roßdorf, DE
• Thomas Rhein · Stadecken-Elsheim, DE

Key dates

• Filing date: Nov 6, 1989
• Grant date: Nov 5, 1991
• Expiry date: Nov 6, 2009

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31935
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Multi-layer plastic elements containing a polycarbonate core, with a polymethacrylate layer containing a UV absorber, and modified to be impact-resistant, applied to the core, where the polymethacrylate plastic layer is composed of methacrylate copolymers, which form compatible mixtures with polycarbonate, especially the polycarbonate of bisphenol A, exhibit good adhesion between the polycarbonate and the polymethacrylate. The methacrylate copolymers are methyl methacrylate copolymers with (meth)acrylic monomers which contain carbocyclic substituents in the ester group. The protective layer containing UV absorber is applied to the polycarbonate plastic in thickness from 1 to 500 .mu.m by coextrusion or by lacquering.