Patent · US Active

Opaque multi-layer body made of polycarbonate and having weathering stability

US12104045B2 · kind B2 · utility

0Cited by

9References

15Claims

0Family size

Assignee

Covestro Intellectual Property GmbH & Co. KG · DE

Inventors

Alexander Meyer · Mülheim an der Ruhr, DE
Joerg Reichenauer · Krefeld, DE
Ulrich Blaschke · Krefeld, DE

Key dates

Filing date	May 27, 2019
Grant date	Oct 1, 2024
Priority date	—
Expiry date	Jan 27, 2042

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08K2003/2241
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to opaque colored multilayer articles having a substrate layer based on polycarbonate or polymethylmethacrylate. The compositions of the substrate layer contain a titanium dioxide having particular properties as white pigment. Compared to the Kronos® 2230 white pigment which is conventionally used as white pigment for corresponding compositions and has more particularly been specially matched to polycarbonate, it is possible to achieve considerably higher weathering stability of the colored shaped bodies provided that a UV absorber-containing coating has been applied to the substrate layer. Color stability and gloss are maintained even after weathering, and brilliant colors can thus be assured.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.