Silica base particles and production process for same

摘要

Provided is a silica base particle having an average particle diameter of 0.01 to 10 mu m, wherein carboxylic esters are present on the surface of the above particle in a proportion falling in a range of 0.05 to 10% by weight based on the weight of the above particle. A polyester film containing the above silica base particles shows an excellent lubricant property and scratch resistance.