Method for preparing lamellar pigments

Abstract

A method for the production of lamellar pigments by a vacuum deposition process is described. The method involves the deposition of a thin layer of sodium fluoride release-substrate material upon a suitable condensing surface, e.g., a moving polyester web, and the deposition thereon of a thin film of lamellar pigment-producing material. The resulting lamellar pigment material is removed from the condensing surface by dissolving the sodium fluoride release substrate material in a substance, e.g., water, which is a nonsolvent for the lamellar pigment material. The material is fragmented into lamellar pigment particles for utilization in a number of applications where the light-reflective properties of such pigment materials are desired. The utilization of a sodium fluoride release layer permits more efficient control of the rate of deposition of the desired release layer and provides lamellar pigments of desirable specular reflectivity.

Dependencies are inferred from the claim text.