Abstract: Disclosed is a flame retardant coating composition comprising, based on the whole wt. of the coating composition, 10-50 wt. % of a water-soluble resin, an acryl based resin or a urethane based resin, 10-30 wt. % of a flame retarding agent, 8-20 wt. % of a flame retarding aid, 30-45 wt. % of a diluting agent and 0.1-0.5 wt. % of an additive. Due to the nonflammable materials contained in the coated layer, combustion of a coated material is retarded in case of a fire. As well, generation of harmful gases is minimized, whereby a period of time for initially suppressing a fire is assured, thus increasing safety.

Abstract: Disclosed is a coating composition for a plastic photochromic lens and the plastic photochromic lens coated with the same. The coating composition includes a spiropyran photovariable color compound and/or spirooxazine photovariable color compound dissolved in toluene, and an acryl based binder. The plastic photochromic lens coated with the coating composition has advantages of short variable time, and good adhesion of the coating composition to the plastic lens and UV prevention effect without an undesirable haze phenomenon.