| abstract |
PROBLEM TO BE SOLVED: To have a sufficiently low refractive index as MgF 2 and to be used as an anti-reflection film for optical equipment using an organic material, and to further have a function of protecting the surface of the organic base material. An antireflection film is provided. SOLUTION: It contains 100 parts by weight of a polysiloxane resin having a fluorohydrocarbon group as a substituent bonded to a silicon atom, and 10 to 80 parts by weight of colloidal silica, An anti-reflection film comprising a polysiloxane resin composition having a refractive index of 1.40 or less. Furthermore, under this film, it has an aromatic hydrocarbon group as a substituent bonded to a silicon atom, An antireflection film having a layer containing a polysiloxane resin having a refractive index of 1.50 or more. |