Precipitated silicas

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...

Reexamination Certificate

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Reexamination Certificate

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07071257

ABSTRACT:
Rubber compositions comprising a precipitated silica with the following physico-chemical properties:BET surface area  35 to 350 m2/gBET/CTAB surface area ratio 0.8 to 1.1Pore volume, PV 1.6 to 3.4 ml/gSilanol group density  6 to 20 ml/(5 g)Average aggregate size 250 to 1500 nmCTAB surface area  30 to 350 m2/gDBP value 150 to 300 ml/100 gV2/V1by Hg porosimetry0.19 to 0.46DBP/CTAB 1.2 to 3.5.

REFERENCES:
patent: 5256196 (1993-10-01), Chjonowski et al.
patent: 5484581 (1996-01-01), Esch et al.
patent: 5705137 (1998-01-01), Goerl et al.
patent: 5846506 (1998-12-01), Esch et al.
patent: 5859117 (1999-01-01), Goerl et al.
patent: 5871867 (1999-02-01), Rausch et al.
patent: 5925708 (1999-07-01), Esch et al.
patent: 6180076 (2001-01-01), Uhrlandt et al.
patent: 6214383 (2001-04-01), Esch et al.

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