| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a silicon dioxide powder displaying a good thickening action combined with a short incorporation time into polymers, particularly polyester resins. <P>SOLUTION: The silicon dioxide powder is pyrogenically produced in the form of aggregates of primary particles having a BET surface area of 200±25 m<SP>2</SP>/g, wherein the aggregates display an average surface area of 7,000 to 12,000 nm<SP>2</SP>, an average equivalent circle diameter (ECD) of 80 to 100 nm and an average circumference of 850 to 1,050 nm. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
