Patent ID: 6393868
Filing Date: 2002-05-28
Classification: C03B

Abstract:
A process for the production of an article selected from the group consisting of interference filters, interference pigments and interference particles having sequences of interference layers composed of layers i of prescribed thicknesses d(i) and refractive indices n(i), comprising the steps of:providing a stack of glass plates having plane surfaces, the stack comprised of at least two layers i of glasses having refractive indices n(i) and thicknesses d0(i), which are each larger than the prescribed thicknesses d(i) by the same multiplying factor; heating the stack to a temperature above the transformation temperature of the glasses of the layers; applying the stack onto a carrier plate composed of a thermoplastic material which is soluble, and wherein the stack and the carrier plate are drawn together; drawing the stack during or after heating in such a manner that the respective layers obtain the prescribed thicknesses d(i); cooling of the drawn stack; and dissolving the carrier plate in a solvent after cooling.