| 摘要 |
<p>This invention provides flame-generated fine silica particles having an average particle size of 0.05 to 1 µm, wherein a fractal structure parameter α<Sub>1</Sub> at length scales ranging from 50 nm to 150 nm and a fractal structure parameter α<Sub>2</Sub> at length scales ranging from 150 nm to 353 nm satisfy the following formulas (1) and (2):<MathDetails id="matha01" num="(1)"><MathText><![CDATA[ <math display="block"><mrow><msub><mrow><mtext>-0.0068S + 2.548 ≦ α</mtext></mrow><mrow><mtext>1</mtext></mrow></msub><mtext> ≦ -0.0068S + 3.748</mtext></mrow></math><img id="ia01" file="imga0001.tif" wi="81" he="4" img-content="math" img-format="tif" /> ]]></MathText></MathDetails><MathDetails id="matha02" num="(2)"><MathText><![CDATA[ <math display="block"><mrow><msub><mrow><mtext>-0.0011S + 1.158 ≦ α</mtext></mrow><mrow><mtext>2</mtext></mrow></msub><mtext> ≦ -0.0011S + 2.058</mtext></mrow></math><img id="ia02" file="imga0002.tif" wi="82" he="4" img-content="math" img-format="tif" /> ]]></MathText></MathDetails> wherein S is a BET specific surface area (m<Sup>2</Sup>/g) of the fine silica particles,
in the measurement of small-angle X-ray scattering. When used as a filler for a semiconductor-encapsulation resin or when used as a filler for a polishing agent or for a coating layer for ink jet papers, the fine silica particles are available at high content without substantial enhancement of the viscosity. Besides, when used as a filler for the resin, the fine silica particlesimprove the strength of the molding compound. Furthermore, when used as a toner additive for electrophotography, the fine silica particles improve the free-flow property of the toner without removal from the toner surfaces.</p> |
