Optical Compensation Films Based on Stretched Cyclic Block Copolymers
AssigneeAkron Polymer Systems, Inc.
InventorsLimin Sun, John Harvey, Lang Hu
Life of this patent
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Abstract
By stretching a semi-crystalline CBC film, an in-plane orientated compensation film could be obtained with good optical transparency and significantly higher retardation values at a much lower film thicknesses because of a relatively high amount of birefringence per unit thickness.
Claims16
An in-plane oriented optical compensation film with an out-of-plane retardation (Rth) from −55 nm to −550 nm and in-plane retardation (Re) from 50 nm to 580 nm with a thickness from 20 μm to 200 μm, preferably, from 20 μm to 40 μm prepared by uniaxial or biaxial stretching of a semi-crystalline cyclic block copolymer (CBC) film where the crystallinity before stretching is between 1% and 10%.
Dependencies are inferred from the claim text.