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US 8,986,442 B2Granted
Specially precipitated silicic acids for rubber applications
AssigneeEvonik Degussa GmbH
InventorsHans-Detlef Luginsland, Andre Wehmeier, Oleg Stenzel, Stefan Uhrlandt
Life of this patent
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Abstract
The present invention relates to precipitated silicas which have extremely low microporosity and high rubber activity, to a process for their preparation, and to their use as filler for rubber mixtures.
Claims30
A precipitated silica which has the following physical and chemical properties:
- CTAB surface area
- 100-200
- m2/g,
- BET surface area
- 80-110
- m2/g,
- BET/CTAB ratio
- 0.9 to 1.03,
- DBP value
- 210-280
- g/(100 g),
- Sears value V2
- 21-30
- ml/(5 g),
- Moisture level
- 4-8%,
- and
- Ratio of Sears value V2 to
- 0.150 to 0.370
- ml/(5 m2)
- BET surface area.
18 more elements
A precipitated silica which has the following physical and chemical properties:
- CTAB surface area
- 100-160
- m2/g,
- BET/CTAB ratio
- 0.9-1.03,
- BET surface area
- 80-110
- m2/g,
- DBP value
- 210-280
- g/(100 g),
- Sears value V2
- 21-30
- ml/(5 g),
- Moisture level
- 4-8%
- Ratio of Sears value V2 to
- 0.180 to 0.370
- ml/(5 m2),
- BET surface area and
- Primary particle diameter
- 10 to 50
- nm
- as determined by transmission electron spectroscopy (TEM) image evaluation.
21 more elements
Dependencies are inferred from the claim text.