Back to results
US 6,679,945 B2Granted
Pyrogenically prepared silicon dioxide
AssigneeDegussa AG
InventorsMonika Oswald, Gerrit Schneider, Klaus Deller
Life of this patent
Estimating the term…
Abstract
Pyrogenically prepared silicon dioxide with the following physicochemical properties: 1. Average particle size (D50 value)D50≧150 nm (dynamic light scattering, 30 wt %) 2. Viscosity (5 rpm, 30 wt %) η≦100 m·Pas 3. Thixotropy of Ti (η(5 rpm))/(η(50 rpm))≦2 4. BET surface area 30-60 m2/g 5. Compacted bulk=100-160 g/L 6. Original pH≦4.5 can be used for the preparation of dispersions and glass bodies.
Claims3
A pyrogenically prepared silicon dioxide with the following physicochemical properties;
- a) average particle size (D50 value) D50≧150 nm (dynamic light scattering, 30 wt %);
- b) viscosity (5 rpm, 30 wt %) η≦100 m·Pas;
- c) thixotropy of Ti:
- (η(5 rpm))/(η(50 rpm))≦2;
- d) BET surface area 30-60 m2/g;
- e) compacted bulk=100-160 g/L;
- and
- f) original pH≦4.5.
5 more elements
A pyrogenically produced silicon dioxide which has a deacidification index of less than 3% on a weight basis.
Dependencies are inferred from the claim text.