Pigment stabilization

US6126736A · kind A · utility

Assignee

• Clariant Finance (BVI) Limited · VG

Inventors

• Klaus Stoll · Binzen, DE
• Andreas Thuermer · Weil am Rhein, DE
• Gilbert Ligner · Wintzenheim, FR
• Joseph R. Webster · Charlotte, US

Key dates

• Filing date: Feb 17, 1998
• Grant date: Oct 3, 2000
• Expiry date: Feb 17, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K5/0041
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a process of using certain piperidine compounds of formula I ##STR1## in which R.sub.1 is hydrogen, hydroxyl, lower alkyl, lower alkoxy or acyl, PA1 R.sub.2 is a substituted or unsubstituted mono- or bicyclic radical which is aromatic in type, PA1 R.sub.3 is oxygen, --NH-- or --N(C.sub.1-4 -alkyl)-- and PA1 R.sub.8 independently at each occurrence is hydrogen or methyl for stabilizing natural or synthetic, organic or inorganic pigments or pigment mixtures in natural or synthetic, polymeric or prepolymeric substrates against the adverse effects of heat and/or light on the light fastness and color stability, respectively, especially against alterations in shade or light-induced bleaching. The invention also relates to a masterbatch composition.