Patent ID: 8802238

Claim:
An optical compensation film composition comprising a positive birefringent polymer film and a substrate, wherein the polymer film is a positive C-plate and has a positive birefringence greater than 0.005 throughout the wavelength range of 400 nm<λ<800 nm, the film having been cast from a polymer solution comprising a solvent and a polymer having a moiety of wherein R 1 , R 2 , and R 3 are each independently hydrogen atoms, alkyl groups, substituted alkyl groups, or halogens, wherein at least one of R 1 , R 2 , and R 3 is a fluorine atom, and wherein R is hydrogen or a substituent on the styrenic ring, wherein birefringence (Δn) is defined by Δn=n z −(n x +n y )/2, wherein n x and n y represent in-plane refractive indices and n z represents the thickness-direction refractive index.