The porous silica grain, being the porous silica grain which possesses grain between void structure in the

摘要

PROBLEM TO BE SOLVED: To provide porous silica particles useful as a filling material for a composite material.;SOLUTION: The porous silica particles having the interparticle gap structure inside, an average particle diameter (PD) of 0.5-50 μm and a specific surface area of 10-100 m²/g are satisfied with such three requirements (1)-(3) that (1) the range of a pore volume is 0.10-0.25 cc/g, (2) the range of a pore diameter (D1) corresponding to a peak value in a pore diameter distribution (wherein, X axis is pore diameter; and Y axis is the differentiated value of pore volume by pore diameter) is 20-100 nm and (3) the total volume of pores having a pore diameter range of (D1)×0.75-(D1)×1.25 nm is 70% or more of the total volume of the pores.;COPYRIGHT: (C)2010,JPO&INPIT