Hollow silica particles, dispersions of hollow silica particles, and films

摘要

PROBLEM TO BE SOLVED: To provide hollow silica particles which are excellent in film forming property and can give a film having a low reflectance. SOLUTION: The hollow silica particles have one or more hollow portions inside the particles, the number average particle diameter is 100 nm or less, the residual amount of silanol groups is 35 mol% or more, and the content ratio of the surfactant is 20 weight. % Or less, hollow silica having a change rate of 18% or less in the dispersed state when it is ultrasonically dispersed in methyl ethyl ketone at a concentration of 1% by weight and then allowed to stand for 15 minutes at a temperature of 25 ° C. Provide particles. [Selection diagram] None