Multi-layer body made of polycarbonate with high weathering resistance

US9845412B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Alexander Meyer · Mülheim an der Ruhr, DE
• Vincenzo Taravella · Bergamo, IT
• Gianmaria Malvestiti · Trezzo sull'Adda, IT

Key dates

• Filing date: Dec 18, 2013
• Grant date: Dec 19, 2017
• Expiry date: Sep 27, 2034

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B5/223
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Disclosed is a multi-layer body with high weathering resistance comprising (a) a substrate layer containing at least one thermoplastic polymer (b) one cover layer on at least one side of the substrate layer, characterized in that the substrate layer further contains: (a1) at 0.02 wt. % to 0.2 wt %, at least one colorant on the basis of anthraquinone of structure (1) or (2) with structure (1), R1 and R2 standing, independently of each other, for H, OH, OR5 NH2 and NHR5, R5 being selected from alkyl, cycloalkyl, phenyl and substituted and annulated phenyls, and R3 standing for H, alkyl, alkoxy, and R4 standing for H, OH and p-methylphenyl-NH—; and with structure (2): (a2) at 0.01 wt % to 1.00 wt. %, one or a plurality of demolders, and the cover layer consisting of a coating on the basis of polysiloxane or on the basis of polyacrylate or on the basis of polyurethane acrylate, containing at least one UV-absorber and having a layer thickness of 2-15 [mu]m.