Self-adhering polyvinyl chloride safety glass interlayer

Laminated safety glass includes a pair of glass sheets bonded together with a self-adhering composite interlayer. The composite interlayer is formed of a support layer including a plasticized PVC containing film and a polymeric adhesive layer on one, or preferably both, of the major surfaces of the support layer. The adhesive layers are formed of a polymeric material which is capable of adhering to the PVC containing support layer and to the glass sheets. The respective refractive indices of the adhesive layers and the support layer are matched as closely as possible in order to eliminate optical distortion caused by interfacial reflections of incident light. A preferred copolymer resin for forming the adhesive layers is poly(vinyl chloride-co-vinyl acetate-co-maleic acid).