MASTIC, CAULKING, SEALANT AND ADHESIVE COMPOSITIONS CONTAINING PHOTOSENSITIVE COMPOUNDS AND METHOD OF REDUCING THEIR SURFACE TACK

摘要

Mastic, caulking, sealant or adhesive compositions are provided which contain a photosensitive compound, such as benzophenone, which, upon exposure to actinic radiation, renders the surface of the composition tack free and mildew resistant while the remainder of the composition remains flexible. The compositions also contain a binder polymer containing acid units which is preferably derived from acrylic monomers and may also contain air-curable units. The invention also embraces a method of reducing the surface tack of such compositions using the photosensitive compound.