An object of the present invention is to provide an optical film exhibiting a preferable wavelength dispersion and capable of being formed comparatively thinly. The present invention is an optical film containing the repeating unit represented by the following general formula (II). In the formula (II), A, Aâ€², B, and Bâ€² each denote a substituent, a, aâ€², b, and bâ€² denote the number of substituents of the corresponding A, Aâ€², B, and Bâ€². A, Aâ€², B and Bâ€² each independently denote a halogen or an alkyl group having 1 to 4 carbon atoms. R 1 and R 2 denote a halogen, an alkyl group having 1 to 10 carbon atoms, and the like. X denotes â€”COâ€”, â€”SO 2 â€”, and the like. [structure]

Claims

14 · 1 independent · depth 3

14 granted claims

›1.independentA retardation film comprising:na polymer having a repeating unit represented by the following general formula (I):+13

›2.↳ 1The retardation film according to claim 1, wherein the repeating unit is represented by the following general formula (II):d2

›3.↳ 1The retardation film according to claim 1, wherein the optical film exhibits a birefringence index Î”nxz of 0.005 to 0.070 with a wavelength of 550 nm…d2

›4.↳ 1The retardation film according to claim 1, wherein the optical film exhibits Rth(450)/Rth(550)<1.06, andnwherein Rth(450) and Rth(550) denote a retard…d2

›5.↳ 1The retardation film according to claim 1, wherein the optical film exhibits Rth(650)/Rth(550)>0.95, andnwherein Rth(550) and Rth(650) denote a retard…d2

›6.↳ 1The retardation film according to claim 1, wherein the polymer is a polyester-based polymer.d2

›7.↳ 1The retardation film according to claim 1, wherein the optical film satisfies an index ellipsoid of nxâ‰…ny>nz, andnwherein nx denotes a refractive in…d2

›8.↳ 1The retardation film according to claim 1, wherein the optical film satisfies an index ellipsoid of nx>ny>nz, andnwherein nx denotes a refractive inde…d2

›9.↳ 1The retardation film according to claim 1, wherein the optical film is composed of a coating film obtained by applying the polymer to a base material.d2

›10.↳ 1The retardation film according to claim 1, wherein a thickness of the optical film is 20 μm or less.d2

›11.↳ 1An image display device comprising the retardation film according to claim 1.d2

›12.↳ 1The retardation film according to claim 1, wherein the polymer further comprises a repeating unit represented by the following general formula (XIII) …d2+1

›14.↳ 1The retardation film according to claim 1, wherein R1 and R2 each independently denote a halogen or an SiR3R4R5 group, wherein R3 to R5 each independe…d2

Classifications

17 codes

IPC · International Patent Classification

Section C — Chemistry; metallurgy

C09K19/00

USPC · US Patent Classification

428/1.1428/917528/406359/483.1528/271349/117428/1.2252/301.22528/403349/193359/489.1427/99.4428/1.31349/1252/301.16528/405

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Frances Tischler

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Type	Document	Date
related publication	US 20100182693 A1	22 Jul 2010

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