COMPOSITION FOR IMPROVING LIGHTFASTNESS

• Main Authors: SAKAGUCHI MASAAKI, HARA KENJI
• Format: Patent
• Language: English
• Published: 30.04.2009
• Subjects: APPARATUS THEREFOR; CHEMISTRY; ELECTROFORMING; ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; METALLURGY; PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS

PROBLEM TO BE SOLVED: To provide: a composition for improving lightfastness of an article, obtained by subjecting aluminum to an anodic oxidation and dyeing treatment using an organic dye; a method for improving lightfastness using the same; and the article treated by the method. SOLUTION: The composition for improving lightfastness of an article, obtained by subjecting aluminum to an anodic oxidation and dyeing treatment, comprises an aqueous solution, which is obtained by preparing a solution containing a hindered amine-based light stabilizer being a compound with a hindered piperidinyl group and having a pH of ≤3, wherein the pH of the solution is adjusted to 1-9 as occasion demands by the addition of an alkali component. The method for improving lightfastness includes the step of bringing an article, obtained by subjecting aluminum or an aluminum alloy to an anodic oxidation and dyeing treatment, into contact with the composition. The article treated by the method is also provided. COPYRIGHT: (C)2009,JPO&INPIT