TITANIUM DIOXIDE PIGMENT COATED WITH HOLLOW BODIES AND PRODUCTION METHOD

摘要

THE INVENTION RELATES TO A COATED TITANIUM DIOXIDE PIGMENT THAT HAS GOOD OPACITY AND GOOD RETENTION AND IS USED IN DECORATIVE PAPER. ALSO DISCLOSED IS A METHOD FOR PRODUCING SAID PIGMENT. THE INVENTIVE PIGMENT IS CHARACTERIZED BY A SURFACE COATING CONTAINING ALUMINIUM OXIDE PHOSPHATE AND ATTACHED HOLLOW BODIES. THE INVENTIVE PRODUCTION METHOD IS CHARACTERIZED IN THAT AN ALUMINIUM COMPONENT AND A PHOSPHORUS COMPONENT ARE FIRST INTRODUCED INTO A TiO2 SUSPENSION WHILE THE PH VALUE DOES NOT DROP BELOW 10. THEN THE HOLLOW BODIES ARE ADDED, WHEREUPON AT LEAST ONE ACIDIC COMPONENT IS ADDED SUCH THAT THE PH VALUE OF THE SUSPENSION IS LOWERED TO A VALUE RANGING BETWEEN 4 AND 9. IN AN ALTERNATIVE EMBODIMENT OF SAID METHOD, THE SUSPENSION HAS A PH VALUE OF LESS THAN 4 WHEN THE ALUMINIUM COMPONENT AND THE PHOSPHORUS COMPONENT ARE ADDED.