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AssigneeDaimlerChrysler AG
InventorsMichael Gailberger, Katja Strelzyk, Karl Holdik, Fritz Dannenhauer, Erik Grosse, Andreas Stohr
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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.
A method for producing platlet-shaped interference pigments comprising applying liquid crystalline polymers in a liquid state as a first thin film to a smooth substrate to thereby arrange its mesogens at least approximately chirally-nematically, smectically, cholesterically, or combinations thereof, and curing the film, leaving said film on the smooth substrate and applying a layer of a light absorbent dye to the film in a layer thickness that produces light absorption and then curing said film with the light absorbent layer thereon thereby resulting in a two-layer cured film, pulling the resulting two-layer cured film off the substrate, and fracturing the two-layer film into platelet-shaped particles, the particles having lateral uncoated edges.
A method for making platelet-shaped interference pigments comprising applying liquid crystal polymers (LCP) in a liquid state as a first thin film to a substrate to thereby arrange its mesogens at least approximately chirally-nematically, smectically, cholesterically, or combinations thereof, and curing the film, said substrate comprising a film with a light-absorbent dye in a layer thickness that produces light absorption, curing said film of liquid crystal polymers in the liquid state thereby resulting in a sandwich, and fracturing the resultant sandwich of the absorption film and cured LCP film into platelet-shaped particles, the particles having lateral uncoated edges.
A method for making platelet-shaped interference pigments comprising applying liquid crystal polymers (LCP) in a liquid state as a first thin film to a substrate to thereby arrange its mesogens at least approximately chirally-nematically, smectically, cholesterically, or combinations thereof, and curing the film, said substrate comprising a film with a light-absorbent dye in a layer thickness that produces light absorption, curing said film of liquid crystal polymers in the liquid state thereby resulting in a sandwich, and fracturing the resultant sandwich of the absorption film and cured LCP film into platelet-shaped particles, thereby resulting in platelet-shaped interference pigments having edges in the form of circumferentially uncoated fractured edges of said sandwich.
Dependencies are inferred from the claim text.