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US 7,608,234 B2Granted
Precipitated silicas with particular pore size distribution
AssigneeDegussa AG
InventorsOleg Stenzel, Hans-Detlef Luginsland, Stefan Uhrlandt, Andre Wehmeier
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Abstract
Precipitated silicas useful, for example, as fillers in elastomer mixtures or vulcanizates have a particularly broad pore size distribution of the pores with a pore diameter smaller than that of the maximum of the derivative of the pore volume distribution function, and have simultaneously very low microporosity and high rubber activity.
Claims18
A precipitated silica, having the following physicochemical parameters:
- a relative breadth γ of pore size distribution of
- 4.0-10.0 (g nm)/ml,
- a BET surface area of
- 90-320 m2/g,
- a CTAB surface area of
- 100-200 m2/g,
- a Sears number V2 of
- 26-40 ml/(5 g), and
- Sears number V2/CTAB ratio of
- 0.16-0.28 ml/(5 m2).
7 more elements
Dependencies are inferred from the claim text.