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US 7,071,257 B2Granted
Precipitated silicas
AssigneeDegussa AG
InventorsHeinz Esch, Udo Görl, Robert Kuhlmann, Ralf Rausch
Life of this patent
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Abstract
Rubber compositions comprising a precipitated silica with the following physico-chemical properties: BET surface area 35 to 350 m2/g BET/CTAB surface area ratio 0.8 to 1.1 Pore volume, PV 1.6 to 3.4 ml/g Silanol group density 6 to 20 ml/(5 g) Average aggregate size 250 to 1500 nm CTAB surface area 30 to 350 m2/g DBP value 150 to 300 ml/100 g V2/V1 by Hg porosimetry 0.19 to 0.46 DBP/CTAB 1.2 to 3.5.
Claims3
A vulcanized rubber compound comprising precipitated silica having the following physico-chemical properties:
- BET surface area:
- 35 m2/g to 350 m2/g;
- BET/CTAB surface area ratio:
- 0.8 to 1.1;
- Pore volume, PV:
- 1.6 ml/g to 3.4 ml/g;
- Sears value (V2):
- 6 to 20 ml/(5 g);
- average aggregate size:
- 250 nm to 1500 nm;
- CTAB surface area:
- 30 m2/g to 350 m2/g;
- DBP volume:
- 150 ml/100 g to 300 ml/100 g;
- V2/V1 by Hg porosimetry:
- 0.19 to 0.46;
- and
- DBP/CTAB:
- 1.2 to 3.5.
16 more elements
Dependencies are inferred from the claim text.