Patent ID: 6908646

Claim:
An anisotropic scattering film, wherein (I-1) said film has a seal-island structure which comprises a matrix phase consisting of at least one polymeric material, and a dispersed phase consisting of at least one polymeric material, (I-2) the dispersed phase is rod-like, (I-3) the dispersed phase substantially orientates to one direction, (I-4) the refractive index of the dispersed phase in major axis direction differs from the refractive index of the matrix phase in the corresponding direction, and (I-5) the diameter of the dispersed phase is 200 nm or less, and the length of the dispersed phase is 800 nm or more, wherein the polymeric material forming the dispersed phase has FT of 170° C. or more and less than 350° C., FT being a temperature at which the melt viscosity of the polymeric material is 48000 poises when the material is heated at a temperature-raising rate of 4° C./minute while being extruded from a nozzle having 1 mm of inner diameter under a load of 100 kg/cm 2 ; said polymeric material forming the dispersed phase is an aromatic liquid crystal polyester which has an aromatic ring in the main chain, comprising the following repeating units (A), (B) and (C) shown below, with 50 mole % or more of the repeating unit (A), and substantially an equimolar amount of the repeating unit (B) to the repeating unit (C): wherein Ar 1 represents a divalent group shown by below formula (A-1) or (A-2) wherein Ar 2 represents a divalent group shown by below formula (B-1), (B-2), (B-3) or an alkylene group having 2 to 4 carbon atoms. wherein Ar 3 represents a divalent group shown by below formula (C-1), (C-2) or (C-3), and X in formula (C-3) represents an alkylene group having 1-3 carbon atoms, —O—, or —S—,