Abstract: An object of the present invention is to provide a method for producing porous silica particles having a small particle diameter in high yield relative to a volume of a reaction solution. In order to achieve the object, the present invention provides a method for producing porous silica particles having pores on the surfaces thereof, the method including a step of adding a mixed solution (solution A) containing tetraalkoxysilane, alkylamine, and alcohol to a mixed solution (solution B) containing ammonia, alcohol, and water and performing a hydrolysis and condensation reaction of the tetraalkoxysilane to produce silica particles, and a step of removing the alkylamine from the silica particles.

Abstract: A UV-curable composition for optical discs contains a fluorine-containing UV-curable resin having a poly(perfluoroalkylene ether) chain and a UV-curable group. The fluorine-containing UV-curable resin exhibits good compatibility with the composition and satisfactorily localizes in and near a surface of a coating film. Thus, the composition can be used to form an outermost layer of an optical disc such that the droplet size of grease such as that constituting fingerprints adhering to the outermost layer is reduced and scattering of light having a short oscillation wavelength passing through the outermost layer is suppressed. Accordingly, an optical disc on and from which signals can be satisfactorily recorded and read is formed.

Abstract: A UV-curable composition for optical discs contains a fluorine-containing UV-curable resin having a poly(perfluoroalkylene ether) chain and a UV-curable group. The fluorine-containing UV-curable resin exhibits good compatibility with the composition and satisfactorily localizes in and near a surface of a coating film. Thus, the composition can be used to form an outermost layer of an optical disc such that the droplet size of grease such as that constituting fingerprints adhering to the outermost layer is reduced and scattering of light having a short oscillation wavelength passing through the outermost layer is suppressed. Accordingly, an optical disc on and from which signals can be satisfactorily recorded and read is formed.