The invention relates to a curable composition comprising: (A) a benzoxazine component; and (B) silica particles dispersed therein, the silica particles having a maximum length in any direction of space in the range of about 2 to 200 nm determined by transmission electron microscopy, and an amino benzene, phenol or thiophenol being bound to the surface of said silica particles. The invention further relates silica particle dispersions and cured product made from the curable compositions, such as prepregs and towpreg.
