| 摘要 |
PURPOSE:To enhance scratch resistance of the surface of a lens and to give a reflection preventing effect while retaining impact strength of the raw material of the lens, by forming on a resin having comparatively high refractive index a thick synthetic resin layer having an index near it as a hard coat layer, and further, a thin resin layer having low index. CONSTITUTION:A resin used for an optical lens in our invention is made by radically polymerizing a monomer mixture contg. 30-50pts.wt. styrene, 40- 70pts.wt. 2,2-bis(metachloroxyethoxy-3,5-dibromophenyl)-propane, and 0.01- 2.0pts.wt. ultraviolet absorber. a hard coat layer formed on this polymer is made of a synthetic resin having formulaIand 1.55-1.65 refractive index comparatively near that of said lens. Its thickness is 1-20mum enough to improve scratch resistance. The uppermost layer formed on this layer is made of a plastic consisting mainly of alkoxysilane or the like fluorine-contg. resin monomer units, and these resins are low in refractive index, and high in resistance to scratch. |
