Laser marking of effect coatings

US6207240A · kind A · utility

Assignee

• Clariant Corporation · DE

Inventors

• Axel Schoenfeld · Wiesbaden, DE
• Andreas Stohr · Freinsheim, DE
• Hans Joachim Metz · Darmstadt, DE

Key dates

• Filing date: Aug 13, 1999
• Grant date: Mar 27, 2001
• Expiry date: Aug 13, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K19/00
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

The invention relates to a process for generating a marking on an effect coating or molding compound comprising cholesteric liquid-crystalline main-chain or side-group polymers or comprising a combination of main-chain and side-group polymers, which comprises inducing a color change at the irradiated sites of the effect coating or molding compound by laser irradiation.