Patent ID: 7449135

Claim:
A manufacturing process of a flexible plastic substrate for optical display comprising: (a) placing cyclic olefin copolymer between upper and lower heatresistant sheets; (b) placing the heat-resistant sheets and the cyclic olefin copolymer between upper and lower pressure plates of a hot press machine, and heating and pressurizing at a compression temperature within the approximate range of 200° C.-280° C. to form a cyclic olefin copolymer film; (c) taking out the cyclic olefin copolymer film, and placing the film into ice water for quenching treatment; (d) placing the cyclic olefin copolymer film between two flat plates, and heat treating in an evacuated compartment the flat plates with cyclic olefin copolymer film disposed therebetween; and finishing this process by taking out the cyclic olefin copolymer film wherein steps (a)-(d) to obtain a surface roughness within the approximate range of 1.25 nm -1.5 nm for the cyclic olefin copolymer film.