Metal effect pigments coated with SiO₂, method for producing said metallic effect pigments and use

摘要

The invention relates to a method for coating metallic effect pigments with silicon oxide, in which alkoxysilane(s) and/or silicon halide(s) in organic solvent are reacted with water in the presence of metallic effect pigments, where the reaction includes at least two steps, where (a) the reaction is carried out with addition of acid in a first step and with addition of base in a second step or where (b) the reaction is carried out with addition of base in a first step and with addition of acid in a second step. The invention further relates to the coated metallic effect pigments producible by way of the method of the invention, and also to the use thereof.

主权项

1. A method for coating metallic effect pigments with silicon oxide, said method comprising:
reacting a reaction mixture comprising at least one of alkoxysilane(s) and silicon halide(s) with water in the presence of metallic effect pigments(s) and organic solvent(s), wherein the reaction comprises, (1) adding acid to the reaction mixture in a first step and adding base to the reaction mixture in a second step during the reaction; or (2) adding base to the reaction mixture in a first step and adding acid to the reaction mixture in a second step during the reaction.