Examples of suitable transparent polymers include polyesters such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), polyolefins, particularly the metallocened polyolefins, such as polypropylene (PP) and high-density polyethylene (HDPE) and low-density polyethylene (LDPE), polyvinyls such as plasticized polyvinyl chloride (PVC), polyvinylidene chloride, cellulose ester bases s