Silane-treated forsterite fine particles and production method therefor, and organic solvent dispersion of silane-treated forsterite fine particles and production method therefor

An organic solvent dispersion of silane-treated forsterite microparticles, the dispersion comprising:

• silane-treated forsterite microparticles having a specific surface area of 5 to 100 m2/g, and having 1 to 5 silyl groups bound to 1 nm2 of the surface area thereof;
• and
• a dispersion medium containing an organic solvent,
• wherein the silyl groups are represented by the following formula (1):
• —Si(R1)n(X)3-n (1)
• wherein:
• R1 represents at least one member selected from the group consisting of an alkyl group, an aryl group, a halo-alkyl group, a halo-aryl group, an alkenyl group, an epoxy group, a (meth)acryloyl group, a mercapto group, an amino group, and a cyano group, each of which is substituted or unsubstituted and has a solubility parameter (SP), estimated through the Fedors method, of 5.5 to 11.5;
• X represents at least one of a hydroxyl group and a C1 to C4 alkoxy group;
• and
• n is an integer of 0 to 3.