METHOD OF REMOVING HARD COATING FROM PLASTIC LENS

摘要

An effective method by which a defectively processed plastic lens having a hard coating, in particular one with a high refractive index, can be regenerated to its reusable state, which comprises contacting the plastic lens having a hard coating consisting mainly of an organopolysiloxane compound and an inorganic compound with an aqueous solution of a silicate and/or a phosphate. For example, a 30 % aqueous solution of trisodium phosphate heated to 50 DEG C is sprayed over the coating for 5 minutes. Thus, the hard coating is removed and the lens is regenerated to its reusable state without roughening the surface.