Abstract: In a solar screening assembly optionally heatable for defrosting/defogging/deicing which includes a plasticized polyvinyl butyral layer and a metal/dielectric stack comprising one or more light-reflecting metal layers and two or more antireflective layers, a cap layer Ta.sub.2 O.sub.5 or SiOx where x.ltoreq.2, in face-adhering contact with the plasticized polyvinyl butyral layer, such assembly when laminated with glass exhibiting pummel adhesion of at least 3 after at least 1000 hours exposure to UV radiation in a Fadeometer, Weatherometer or equivalent system.

Abstract: Disclosed herein is a laminated safety glass prepared from a buffered polyvinyl acetal sheet. The sheet contains a pH buffer having an aqueous solution pH in the range of from 3 to 7 which stabilizes the sheet against viscosity degradation.

Abstract: Disclosed herein is a method for stabilizing the viscosity of polyvinyl acetal resins, especially those resins used as interlayers for laminated safety glass. The disclosed process comprises incorporating a buffer having a pH in the range of from 3 to 7 into the plasticized polyvinyl acetal.