Polymers and compounds including a diphenylmethylene or a 9H-fluorene moiety; and sunscreen compositions including a mixture of a photoactive compound and any one of the foregoing derivatives are disclosed herein. Also disclosed are methods for stabilizing a sunscreen composition by the addition of one or more of the foregoing derivatives, methods of filtering out ultra-violet light from a substrate by the use of one or more such derivatives; and methods for terminating a polymerization reaction by the addition of derivatives of diphenylmethylene and/or 9H-fluorene. Synergistic combinations of the polymer with (1) diesters or polyesters of a naphthalene dicarboxylic acid, or (2) oxybenzone enhance the photostability of sunscreen compositions containing a photodegradable sunscreen active compound, such as avobenzone.
本文公开了包括二苯基亚甲基或 9H-
芴分子的聚合物和化合物;以及包括光活性化合物和上述任何一种衍
生物的混合物的防晒组合物。本文还公开了通过添加一种或多种前述衍
生物稳定防晒组合物的方法、通过使用一种或多种此类衍
生物滤除基质中紫外线的方法;以及通过添加二苯亚甲基和/或 9H-
芴衍
生物终止聚合反应的方法。该聚合物与(1)
萘二
羧酸二酯或聚酯,或(2)氧苯酮的协同组合可提高含有光降解防晒活性化合物(如阿伏苯酮)的防晒组合物的光稳定性。