Patent ID: 6261649
Filing Date: 2001-07-17
Classification: C09K,G02B,G02F

Abstract:
An optical film comprising a first liquid crystalline polymer selected from the group consisting of polyesters, polyamides, polyimides, polycarbonates and polyesterimides which has at one or both ends of the polymer chain a monofunctional structural unit selected from the group consisting of ##STR67##wherein R.sub.1 and R.sub.2 may be the same or different; R.sub.1 and R.sub.2 are a C.sub.3 -C.sub.20 alkyl or a C.sub.2 -C.sub.20 fluoroalkyl group; X is hydrogen or halogen; i is 0 or 1; j is 0 or 1; k is 0 or 1; a is 0 or 1; and b is 0 or 1, with the proviso that a+b.noteq.0;said first liquid crystalline polymer homeotropically oriented exhibiting optically positive uniaxiality wherein a nematic hybrid orientation, created in a liquid crystalline state, is immobilized; anda second liquid crystalline polymer which has a logarithmic viscosity at least 0.01 dl/g higher than that of said first liquid crystalline polymer and a glass transition point at least 5.degree. C. higher than that of said first liquid crystalline polymer and which exhibits optically positive uniaxiality.