Laser marking of effect coatings
AssigneeClariant GmbH
InventorsAxel Schoenfeld, Andreas Stohr, Hans Joachim Metz
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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.
Claims16
A process for generating a marking on a coating of a substrate or on a molding compound, wherein the coating or the molding compound consists essentially of a polymer selected from the group consisting of a cholesteric liquid-crystalline main-chain polymer, a cholesteric liquid-crystalline side-group polymer, and a combination of said polymers, said process comprising inducing a color change on the coating or the molding compound by irradiation at an irradiated site with a laser light until a milky or a cloudy color, or a gray or a black color becomes visible at the irradiated site of the molding compound or until the substrate becomes visible at the irradiated site.
A process for generating a marking on a coating of a substrate or on a molding compound, wherein the coating or the molding compound consists essentially of a colorant which is stable with respect to laser light and a polymer selected from the group consisting of a cholesteric liquid-crystalline main-chain polymer, a cholesteric liquid-crystalline side-group polymer, and a combination of said polymers, said process comprising inducing a color change on the coating or the molding compound by irradiation at an irradiated site with a laser light until a color of the colorant becomes visible at the irradiated site.
Dependencies are inferred from the claim text.