| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a resin cured material which has extremely high flowability when being highly filled into a resin and in which spherical silica powder is properly dispersed by using the spherical silica powder having a particular particle size and a particular isolated silanol group. <P>SOLUTION: The spherical silica powder satisfies following conditions: (α) the particle size distribution has two frequency maximum values A (μm) and B (μm) wherein the frequency maximum value A has a range of 0.40-1.5μm and the maximum value B has a range of 0.03-0.07μm, and the volume frequency value of A is 3.0-7.0% and the volume frequency value of B is 1.0-9.0%; and (β) the spherical silica powder having a particle size of less than 0.1μm is 5-30 mass% and the concentration of the isolated silanol (isolated OH) group of the powder is less than 1.0/nm<SP POS="POST">2</SP>. It is preferable that the cumulative volume 10% value is 0.04-0.1μm and the cumulative 90% value is 1.4-2.0μm. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
