Patent ID: 7604381

Claim:
An optical article, comprising: a top layer having a top structured surface that collimates light; a core layer secured to the top layer opposite the top structured surface; and a bottom layer secured to the core layer opposite the top layer; wherein: either the top layer or the core layer comprises a first extrudable polymer having a flexural modulus of greater than 2.5 GPa as measured according to ASTM D790, and the other layer comprises a second extrudable polymer, the second extrudable polymer having a flexural modulus of 2.5 GPa or less as measured according to ASTM D790, an impact strength of greater than about 40 J/m as measured according to ASTM D256, and tensile elongation at break of greater than about 5% as measured according to ASTM D638; and the bottom layer comprises a third extrudable polymer.