FINE SPHERICAL COMPOSITE PARTICLE, PRODUCTION THEREOF, AND POLYESTER COMPOSITION CONTAINING THE SAME

摘要

A fine spherical composite particle comprising a fine spherical amorphous silica particle and, localized on its surface, an oxide and/or hydroxide of a metal whose ion has a low electronegativity, and containing a specified amount of an alcohol bonded to its surface; a process for producing the particle; and a polyester composition comprising a polyester resin and 0.005-10 wt.% of the particles. The particle hardly aggregates per se, is excellent in dispersibility in various resins and rubbers, and has excellent properties as a filler or modifier. A polyester composition useful for making a film excellent in slipperiness and wear resistance can be obtained by compounding an appropriate amount of the particles with a polyester resin.