Method for producing mesoporous silica particles

2:

• The method for producing mesoporous silica particles according to claim 1, wherein the mesoporous silica particles have an average pore size of 1 to 3 nm and an average primary particle size of 0.005 to 0.2 μm.

4:

• The method for producing mesoporous silica particles according to claim 1, wherein the silica source yields a silanol compound by hydrolysis.

5:

• The method for producing mesoporous silica particles according to claim 1, wherein said removing comprises baking the composite silica particles so as to remove the emulsion droplets and the surfactant from the composite silica particles, thereby obtaining hollow mesoporous silica particles with gas filled in a hollow portion present on an inner side relative to the outer shell portion.

6:

• The method for producing mesoporous silica particles according to claim 5, wherein the hollow portion of the hollow mesoporous silica particles has an average diameter of 0.004 to 0.15 μm.

7:

• The method for producing mesoporous silica particles according to claim 5, wherein a powder X-ray diffraction spectrum of the hollow mesoporous silica particles obtained by irradiation with a CuKα1 ray (λ=0.154050 nm) exhibits are at least one peak having a peak top in a region of a diffraction angle (2θ) corresponding to a crystal lattice spacing (d) in a range of 2 to 6 nm.

8:

• The method for producing mesoporous silica particles according to claim 5, wherein the hollow mesoporous silica particles have a BET specific surface area of 500 to 1500 m2/g.

9:

• The method for producing mesoporous silica particles according to claim 1, wherein said removing comprises contacting a cation exchange resin with a dispersion solution comprising the composite silica particles obtained from said adding so as to remove the surfactant from the composite silica particles, and then diluting the dispersion solution with an organic solvent and concentrating the same in this order so as to remove the emulsion droplets from the composite silica particles, whereby mesoporous silica particles with the organic solvent filled in a hollow portion present on an inner side relative to the outer shell portion are obtained.

11:

• The paint composition according to claim 10, wherein the mesoporous silica particles have an average pore size of 1.0 to 2.5 nm in the outer shell portion.

12:

• A coating film formed using the paint composition according to claim 10.

14:

• The coating film according to claim 12, having a film thickness of 10 to 300 nm.

15:

• An antireflection film comprising the coating film according to claim 12.