| 摘要 |
The invention relates to a method of forming (rutile) titanium dioxide-coated platelet-like pigments in which hydrous titanium dioxide is deposited on platelet-like particles followed by calcining, comprising (a) effecting the titanium deposit in the presence of an α-hydroxy carboxylic acid, especially glycolic acid, or oxalic acid, and an amino acid, especially glycine, alanine, valine, aspartic acid (α-, β- and γ-form); or an amino acid; to the pigments obtained by the method and the use thereof. The method can work in the absence of exogenous metal and Ti(III). The rutile TiO2-coated substrate of the present invention has at least the same advantages and characteristics of a tin containing product which includes luster, color, color homogeneity and few small particle formation during manufacture. |
| 主权项 |
1. A method of forming a rutile titanium dioxide-coated platelet-like pigment in which hydrous titanium dioxide is deposited on platelet-like particles, comprising
(a) effecting the titanium deposit in the presence of an a-hydroxy carboxylic acid and an amino acid selected from the group consisting of alanine, phenylalanine, glycine, proline, cysteine, histidine, glutamine, leucine, isoleucine, arginine, lysine, serine, threonine, tryptophan, methionine, valine, tyrosine and asparagine, wherein the platelet-like particles have two flat and parallel surfaces with an aspect ratio length to thickness of from about 2:1 to about 1000:1 and a length to width ratio of from 3:1 to 1:1. |
