Process for coating metal oxide pigments and pigments obtained.

A NEW PROCESS FOR THE PRODUCTION OF PIGMENTS SUITABLE FOR USE IN PAPER LAMINATES HAS BEEN DEVELOPED IN WHICH A METAL OXIDE IS TREATED WITH A ZINC WATER SOLUBLE SALT OR A PHOSPHORIC ACID AND SUBSEQUENTLY WITH A METAL ALUMINATE , IN SUCH A WAY THAT A COATING CONTAINING ZINC AND PHOSPHATE IONS ALONG WITH ALUMINUM IONS IS DEPOSITED IN THE METAL OXIDE. THE PH OF THE DISPERSION FOLLOWING THE METAL OXIDE IS MAINTAINED AT A VALUE THAT DOES NOT EXCEED 8.0 DURING PRECIPITATION. A PARTICULARLY USEFUL PIGMENT IS PRODUCED, WHICH HAS A COATING CONTAINING ZINC IONS IN A QUANTITY OF 0.5 TO 5% BY WEIGHT AS ZNO, PHOSPHATE IONS IN A QUANTITY OF 0.2 TO 3% AS P SUB 2 OR SUB 5 E IONS OF ALUMINUM IN A QUANTITY OF 0.5 TO 5% EXPRESSED AS TO SUB 2 OR SUB 3 IN THE WEIGHT OF TIO SUB 2.