HARD COATING SOLUTION FOR OPTICAL LENSES IN PLASTIC MATERIAL

摘要

Hard coating solution for plastic optical lenses, containing at least one metal oxide and at least one silane coupling agent in an amount which satisfies at least one of the following conditions (I) and (II): / X / Y = 2.0. . . (I) BR/ x / y = 0.7. . . (II) where X is the sum of the molar concentration of the metal oxide, Y is the sum of the molar concentration of the silane coupling agent, x is the sum of the solids content of the metal oxide, and y is the sum of the solids content of the silane coupling agent. By using this hard coating solution, it is easy to determine an appropriate ratio of the metal oxide sol to the silane coupling agent, and the resulting hard coating layer, even if any defect, such as abrasion or scuffing , is contained in a multilayered layer, does not lead to the formation of cracks under the influence of ultraviolet radiation and the like.