Patent · US Active

Stabilization of photochromic systems

US8262945B2 · kind B2 · utility

1Cited by

8References

10Claims

0Family size

Assignee

BASF SE

Inventors

Mara Destro · Bologna, IT
Dario Lazzari · Bologna, IT
Dirk Simon · Mutterstadt, DE
Manuele Vitali · Bologna, IT

Key dates

Filing date	Jul 24, 2009
Grant date	Sep 11, 2012
Priority date	—
Expiry date	Jul 24, 2029

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08K5/3492
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Photochromic compositions are disclosed comprising a polymeric material, a photochromic dye, a hydroxyphenyl triazine UV absorber and, optionally, a further light stabilizer selected from the sterically hindered amines. These systems provide a reversible photochromic effect and show improved light stabilization and color fastness.

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