Method for producing platelet-shaped interference pigments

US6203736A · kind A · utility

Assignee

• Daimlerchrysler AG · US

Inventors

• Michael Gailberger · Neu-Ulm, DE
• Katja Strelzyk · Ulm, DE
• Karl Holdik · Ulm, DE
• Fritz Dannenhauer · Hasel, DE
• Erik Grosse · Ulm, DE
• Andreas Stohr · Freinsheim, DE

Key dates

• Filing date: Aug 7, 1998
• Grant date: Mar 20, 2001
• Expiry date: Aug 7, 2018

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31681
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to platelet-shaped interference pigments for effect paints for painting objects of daily use, especially vehicle bodies, with the interference pigments including liquid crystal polymers (LCP) with main and/or side groups--mesogens--which are arranged at least approximately chirally-nematically or the like. In order to be able to paint different colored backgrounds in a covering fashion using the transparent interference pigments, the interference pigments are built up in several layers and also have at least one and preferably two interfering layer(s) of liquid crystal polymers and even of a single, preferably centrally located, light-absorbent layer, with the light-absorbent layer absorbing at least a portion of the visible light spectrum. Advantageously the light-absorbent layer can absorb light in the entire visible light spectrum, in other words appear black. It is also possible for it to be made light-absorbent within those partial areas of the visible light spectrum that lie outside one of the colors of the interference pigments. A method is also disclosed for manufacturing the multilayer interference pigments.