Process for producing laminated sheets or films and moldings having UV-stability and thermal aging resistance

US6589378B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Achim Grefenstein · Altrip, DE
• Gerhard Lindenschmidt · Leimen, DE
• Carsten Netze · Heidelberg, DE
• Doris Zeltner · Wasserburg am Inn, DE

Key dates

• Filing date: Jun 21, 2001
• Grant date: Jul 8, 2003
• Expiry date: Jun 21, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31909
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process for producing a UV-stable laminated structure having thermal aging resistance includes coextruding the following layers in a single-stage operation, or laminating the following layers onto one another in a heatable roll nip:a substrate layer made up of a graft copolymer and a styrene and/or (meth)acrylate/(meth)acrylonitrile copolymer, and optionally containing a polycarbonate and a fibrous and/or particulate filler; anda transparent top layer of polymethyl methacrylate.In another embodiment, an interlayer of e.g., impact-modified polymethyl methacrylate or polycarbonate, is coextruded or laminated between the transparent top layer and the substrate layer to produce a UV-stable laminated structure. An adhesion layer containing an adhesion promoter can be coextruded or laminated on the outer surface of the substrate layer.A molding is produced by thermoforming the UV-stable laminated structure, which is advantageously backsprayed or back-cast with the substrate layer or a polyurethane foam. The molding can take the form of an automotive exterior bodywork component.