Patent ID: 7786231
Filing Date: 2010-08-31
Classification: C08F,C08G,C09K

Abstract:
1. An optical anisotropic film comprising a cycloolefin polymer containing polar functional groups and having a molecular weight of 100,000 or more, wherein the optical anisotropic film has 70 to 1000 nm of a retardation value (R the polymer comprises more than 30 mol % of norbornene-based compound containing a polar functional group represented by the following Chemical Formula 5; and the cycloolefin polymer containing polar functional groups is prepared by a method comprising; a) preparing a catalyst mixture including i) a precatalyst selected from the group consisting of Pd(acetylacetonate) ii) a first cocatalyst which is tricyclohexylphosphine; and iii) a second cocatalyst which is dimethylanilinium tetrakis(pentafluorophenyl)borate; and b) subjecting a monomer solution comprising a norbornene-based compound having an exo isomer content of more than 50 mol %, containing a polar functional group, and represented by the Chemical Formula 5 to an addition polymerization reaction in the presence of an organic solvent and the catalyst mixture, at a temperature of 80-200° C. the total amount of the organic solvent being 50-800% by weight based on the total weight of the monomer contained in the monomer solution, and the product yield of the cycloolefin polymer being 50% by weight or more based on the total weight of the monomer: wherein n d is the film thickness; m is an integer of 0 to 4, at least one of R the non-polar functional group includes hydrogen; halogen; a linear or branched C the polar functional group is a non-hydrocarbonaceous polar group containing at least one of O, N, P, S, and B, and is selected from the group consisting of: OR in which R R p is an integer of 1 to 10.