Optical film comprising polyarylates containing bis-(hydroxyphenyl)-fluorene-ortho-disubstituted bisphenols

A device selected from the group consisting of a liquid crystal screen, an electroluminescent screen and a polarizer transparent conducting film comprising at least one layer of a polymeric optical film, the polymer of the polymeric optical film consisting essentially of one or more polyarylates having repeating units represented by the general structure:

• wherein A represents one or more different bisphenolfluorene radicals having the general formula (I):
• wherein R1 and R2 independently represent an alkyl group, a halogen atom, an alkoxy group, an acyl group, a phenyl group or a nitrite group, with the proviso that R1 and R2 are not both an alkyl group;
• R3, R4, R5 and R6 represent a hydrogen atom, an alkyl group, a halogen, an alkoxy group, an acyl group, a phenyl group, a nitro group, or a nitrile group;
• B represents one or more different dicarboxy radicals having the formula:
• wherein X is a divalent aromatic hydrocarbon group having from 6 to 20 carbon atoms, and n is the number of the repeating units which build up the polymer and is a positive integer higher than 20.