| 摘要 |
PURPOSE:To prevent an optical article from soil with hands or finger marks and to make the dirt undistinguish by covering the surface of the reflection preventing film comprising a single or multilayer consisting essentially of SiO2 with a material consisting of an organo polysiloxane having terminal silanol groups, specifying also the surface reflectivity and the angle of contact to water of the coated surface. CONSTITUTION:An optical article is treated to have <=3% surface reflectivity and >=60 deg. angle of contact to water by coating the surface of the surface layer film formed on a plastic base material comprising a single or multilayered antireflection film consisting of SiO2 with a material consisting of an org. polysiloxane having terminal silanol groups. If the surface reflectivity exceed 3%, undesirable feeling is generated in the case of using the lens for spectacles by generating reflection image such as ghost or flare. If the angle of contact to water is <60 deg., the antifouling effect is insufficient and the slipperiness of the surface is also insufficient. If water repelling effect is also required, the angle of contact is desired to be >=75 deg.. |
