To provide a process for producing a chemically modified filler.
It has now been discovered that an improved modified filler (for example, granular or amorphous inorganic oxide) can be prepared which is characterized such that a carbon content is higher than 1 wt.%; a mercapto content is higher than 0.15 wt.%; a silane conversion index is at least 0.3 (explained as below); and a standard strengthening index is more than 4(explained as below). The modified filler is generated by using a specific combination of a functionalizing agent and a hydrophobizing agent in an aqueous suspension of an inorganic oxide which has pH of ≤2.5 and by processing acid aqueous suspension of the modified filler with an acid neutralizer, then increases the pH of the suspension to the range of pH of 3.0 to 10.
HAHN JAMES R
ONDECK RAYMOND R
| JP2003531215A | 2003-10-21 |
Takaaki Yasumura
Natsuki Morishita
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