Patent ID: 8916236

Claim:
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.