Optical bodies, comprising: a plurality of first optical layers comprising a first polymer composition that comprises (i) a polyester portion having terephthalate comonomer units and ethylene glycol comonomer units, and (ii) a second portion corresponding to a polymer having a glass transition temperature...http://www.google.ca/patents/US6498683?utm_source=gb-gplus-sharePatent US6498683 - Multilayer optical bodies
