Precipitated silica having improved morphological characteristics and process for the production thereof
AssigneeRhone-Poulenc Chimie de Base
InventorsYvonick Chevallier, Jean-Claude Morawski
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Abstract
A precipitated silica having improved morphological characteristics and a process for making precipitated silica. In the precipitated silica of the present invention, the ratio of DBP oil index/CTAB specific surface area is between: 7 and 4 for a range of CTAB of between 50-100 m.sup.2 /g, 4 and 2.5 for a range of CTAB of between 100-200 m.sup.2 /g, 2.5 and 2 for a range of CTAB of between 200-250 m.sup.2 /g, 2 and 1.5 for a range of CTAB of between 250-300 m.sup.2 /g, and 1.5 and 1.2 for a range of CTAB of between 300-350 m.sup.2 /g.
Claims19
A precipitated silica having a BET surface area of between about 50 and 350 m.sup.2 /g, a CTAB specific area between 50 and 350 m.sup.2 /g and a value of oil absorption (DBP) such that the ratio of DBP/CTAB is between:
- 7 and 4 for a CTAB range between 50-100 m.sup.2 /g;
- 4 and 2.5 for a CTAB range between 100-200 m.sup.2 /g;
- 2.5 and 2 for a CTAB range between 200-250 m.sup.2 /g;
- 2 and 1.5 for a CTAB range between 250-300 m.sup.2 /g;
- and
- 1.5 and 1.2 for a CTAB range between 300-350 m.sup.2 /g.
Dependencies are inferred from the claim text.