Polymers which have been around , and which are in current widespread use , include polyethylene , polypropylene , PVC , polystyrene , nylons , polyesters , acrylics , polyurethanes , and polycarbonates .
Common polymers are , include polyethylene , polypropylene , PVC , polystyrene , nylons , polyesters , acrylics , polyurethanes , and polycarbonates .