| 摘要 |
PROBLEM TO BE SOLVED: To produce spherical silica particles excellent in fluidity even when contained in a resin in large quantities, having high adhesiveness and capable of enhancing mechanical characteristics and moisture resistance of a cured body. SOLUTION: The spherical silica particles have the following characteristics (1)-(4); (1) the volume of particles of >=20μm particle diameter occupies <=0.1% of the total volume, (2) the number of particles of <=1μm particle diameter occupies <=0.1% of the total number, (3) plus sieve by a wet manual sieving method using a standard sieve of 45μm opening occupies <=30 ppm of all the particles and (4) the amount of isolated silanol groups having absorption at about 3,740 cm<-1> wavelength in infrared absorption spectroscopy is 6μmol/g to 2 mmol/g. A resin composition containing the spherical silica particles as a filler is provided.
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