Colored nacreous pigment and a method for its preparation
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 29, 1991
Grant Date -
N/A
app pub date -
Jan 18, 1989
filing date -
Jan 22, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a new nacreous pigment which contains a dye or a color pigment and is based on metal-oxide-coated mica particles or other layer silicate particles, and to a method for preparing it. The pigment particles consist of metal-oxide-coated, porous silica skeletons of mica particles or of other silicate particles, containing few or no cations and having at least one dye or color pigment attached to them. In the method, a) a preliminary-stage product is prepared from mica particles or other layer silicate particles and a metal-oxide coating, the metal-oxide coating being poorly soluble or insoluble in acids, b) the thus obtained metal-oxide-coated mica particles or other layer particles are leached with a mineral acid, possibly together with an oxidant, and c) the dyeing of the thus produced metal-oxide-coated, porous silica skeletons of mica particles or of other layer silicate particles, containing few or no cations, is carried out using at least one dye or one color pigment.
First Claim
Other Claims data not available