Abstract
The cyclo-olefin copolymers(COC) which synthesized by different metallocene catalyst have different microstructures and optical properties. We made blendings with two COCs which had different microstucture or norbornene content by solvent casting or thermal blending. The phase separation behavior and optical haze property are distinct in solvent blending of the different microstrure and NB content COCs. On the other hand, the thermal blending ones make less difference because of the similar refractive indexs and the samller size of the disperse phase.