polyethylene terephthalate scrap material containing on its surface a chlorine - containing polymer such as , for example , polyvinylidene chloride or polyvinyl chloride , can be recovered and reused by melt - blending it with a polymer from a defined class of ethylene copolymers containing an epoxy group , and melt processing the blend in the same manner as virgin polyethylene terephthalate . the recovered and reprocessed polymer material has good physical properties and barrier properties .