Example 4
First, component (A) and spherical silica particles (Admafine SO-32R/75C by Admatechs Co., Ltd., average particle size 1.6 μm) in the predetermined amounts in Table 1 were kneaded on a planetary mixer at room temperature for 1 hour, and further kneaded under a reduced pressure of −98.0 kPaG at 150° C. for 1 hour. Once the kneaded mass was cooled to room temperature, it was milled on a three-roll mill. The predetermined amount in Table 1 of component (D) was added to the milled mass, which was milled at room temperature for 10 minutes. The predetermined amount in Table 1 of component (E) was added to the milled mass, which was milled at room temperature for 10 minutes. Finally, the predetermined amount in Table 1 of component (B) was added to the milled mass, which was milled at room temperature for 10 minutes, yielding a composition.
