Hydrous oxide coated TiO{HD 2 {L
阅读：858发布：2023-10-22
专利汇可以提供Hydrous oxide coated TiO{HD 2 {L专利检索，专利查询，专利分析的服务。并且A TiO2 base pigment is treated successively in slurry form at nearly neutral pH conditions with 1 to 4% silica, 4 to 9% alumina, 1 to 4% silica and 4 to 9% alumina. The resultant product is outstanding in hiding power without substantial sacrifice to other properties such as film integrity.，下面是Hydrous oxide coated TiO{HD 2 {L专利的具体信息内容。
1. PROCESS FOR TREATING PIGMENTARY TIO2 COMPRISING A. GRADUALLY ADDING TO AN AQUEOUS SLURRY OF SAID TIO2 AN ALKALINE SOLUTION OF A SOLUBLE SILICATE IN AN AMOUNT TO PROVIDE FROM ABOUT 1 TO 4% SILICA, AS SIO2 AND BASED ON THE WEIGHT OF SAID TIO2, THE PH OF SAID SLURRY BEING MAINTAINED BELOW ABOUT 9 DURING SILICATE ADDITION BY INTRODUCTION OF ACID THEREBY TO PRECIPITATE THE SILICA, THE AMOUNT OF SAID BEING INSUFFICIENT TO LOWER THE PH BELOW ABOUT 5, B. GRADUALLY ADDING TO THE RESULTANT SLURRY AN ALKALINE SOLUTION OF A SOLUBLE ALUMINUM SALT IN AN AMOUNT TO PROVIDE FROM ABOUT 4 TO 9% ALUMINA, AS A1203 AND BASED ON THE WEIGHT OF SAID TI02, THE PH BEING MAINTAINED IN THE RANGE OF ABOUT 5 TO 9 DURING ALUMINUM SALT ADDITION BY INTRODUCTION OF ACID THEREBY TO PRECIPITATE THE ALUMINA, C. GRADUALLY ADDING TO THE RESULTANT SLURRY AN ALKALINE SOLUTION OF A SOLUBLE SILICATE IN AN AMOUNT TO PROVIDE FROM ABOUT 1 TO 4% SILICA, AS SIO2 AND BASED ON THE WEIGHT OF SAID TI02, THE PH BEING MAINTAINED IN THE RANGE OF ABOUT 5 TO 9 DURING SILICATE ADDITION BY INTRODUCTION OF ACID THEREBY TO PRECIPITATE THE SILICA, AND D. GRADUALLY ADDING TO THE RESULTANT SLURRY AN ALKALINE SOLUTION OF A SOLUBLE ALUMINUM SALT IN AN AMOUNT TO PROVIDE FROM ABOUT 4 TO 9% ALUMINA, AS A12 03 AND BADED ON THE WEIGHT OF SAID TI02, THE PH BEING MAINTAINED IN THE RANGE OF ABOUT 5 TO 9 DURING A LUMINUM SALT ADDITION BY INTRODUCTION OF ACID THEREBY TO PRECIPITATE THE ALUMINA.
2. Process according to claim 1 wherein the amount of silica precipitated in each of (a) and (c) is about 2 to 3% and the amount of alumina precipitated in each (b) and (d) is about 5 to 8%.
3. Process according to claim 1 wherein the amount of silica precipitated in each of a (a) and (c) is about 2.5% and the amount of alumina precipitated in each of (b) and (d) is about 7%.
4. Process according to claim 1 wherein the maximum pH in each of (a), (b), (c) and (d) is 8.
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