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US 2006/0137575 A1Published application
Highly dispersible precipitated silica with a high surface area
AssigneeDegussa AG
InventorsOleg Stenzel, Stefan Uhrlandt, Hans-Detlfef Luginsland, Andre Wehmeier
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Abstract
The present invention relates to a highly dispersible silica which has a high surface area, a process to manufacture the aforesaid silica and its use as a tire filler for utility vehicles, motor cycles and high speed vehicles.
Claims17
A precipitated silica, characterized by
- BET surface area
- 170-380
- m2/g
- CTAB surface area
- ≧170
- m2/g
- DBP number
- 305-400
- g/(100 g)
- Sears number V2
- 23-35
- ml/(5 g).
9 more elements
A process for manufacture of a precipitated silica with a
- BET surface area
- 170-380
- m2/g
- CTAB surface area
- ≧170
- m2/g
- DBP number
- 305-400
- g/(100 g)
- Sears number V2
- 23-35
- ml/(5 g)
- where
- a) an aqueous solution of an alkali or alkaline-earth silicate and/or an organic and/or inorganic base with pH ≧9 is present
- b) water glass and an acidifier are metered into this solution with stirring at 55-95° C. for 10-120 minutes simultaneously,
- c) metering is stopped for 30-90 minutes while the temperature is maintained, and
- d) water glass and acidifier are metered into this solution with stirring at this temperature for 20-120 minutes, simultaneously
- e) acidified with acidifier to a pH value of approx. 3.5 and
- f) filtered and dried.
16 more elements
Dependencies are inferred from the claim text.