Patent ID: 7001967
Filing Date: 2006-02-21
Classification: C08F,G02B,Y10S

Abstract:
1. An optical compensating film, comprising: a copolymer consisting essentially of an olefin residue unit represented by the following formula (i): wherein R1, R2, and R3 each represents hydrogen or an alkyl group having from 1 to 6 carbon atoms, and an N-phenyl-substituted maleimide residue unit represented by the following formula (ii): wherein R4 and R5 each represents hydrogen or a linear or branched alkyl group having from 1 to 8 carbon atoms; R7, R8, and R9 each represents hydrogen, a halogen based element, a carboxylic acid, a carboxylic acid ester, a hydroxyl group, a cyano group, a nitro group, or a linear or branched alkyl group having from 1 to 8 carbon atoms; and R6 and R10 each represents hydrogen, a halogen based element, a carboxylic acid, a carboxylic acid ester, a hydroxyl group, a cyano group, a nitro group, or a linear or branched alkyl group having from 1 to 8 carbon atoms, and when at least one of R6 or R10 represents hydrogen, the other should not be hydrogen but represent a halogen based element, a carboxylic acid, a carboxylic acid ester, a hydroxyl group, a cyano group, a nitro group, or a linear or branched alkyl group having from 1 to 8 carbon atoms, the copolymer having a weight average molecular weight, as reduced into standard polystyrene, of from 5×10 the optical compensating film being obtained by uniaxially stretch molding the copolymer, the optical compensating film having a relationship of three-dimensional refractive indexes of nz≧ny>nx in the case where the stretching direction is an x-axis within the film plane, the perpendicular direction to the x-axis within the film plane is a y-axis, and the vertical direction outside the film plane is a z-axis, nx stands for a refractive index in the x-axis direction, ny stands for a refractive index in the y-axis direction, and nz stands for a refractive index in the z-axis direction, and the optical compensating film exhibiting negative birefringence.