| 摘要 |
PROBLEM TO BE SOLVED: To provide precipitated silicic acid which is improved in applied technology characteristics, especially, in "knockdown" and "holddown" characteristics in a composition of a defoaming agent. SOLUTION: The hydrophobic precipitated silicic acid is hydrophobic alkaline precipitated silicic acid and has following physico-chemical parameters: BET<110 m<SP>2</SP>/g, CTAB<150 m<SP>2</SP>/g, BET/CTAB-ratio <3, carbon content >3.1%, and pH value >9. COPYRIGHT: (C)2005,JPO&NCIPI
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