Optical film

Stock material or miscellaneous articles – Liquid crystal optical display having layer of specified...

Reexamination Certificate

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C428S001300, C428S001310, C428S064200, C428S065100, C349S119000, C525S332800, C525S332900, C525S333300

Reexamination Certificate



A film which is a single polymer film and has a smaller phase difference as the wavelength becomes shorter. This film is made from an olefin-based polymer which has an alicyclic group in the side chain, such as hydrogenated polystyrene, the amount of the alicyclic group in the side chain being 60 to 90 wt % based on the whole polymer, and satisfies the following expression:in-line-formulae description="In-line Formulae" end="lead"?R(450)/R(550)<1in-line-formulae description="In-line Formulae" end="tail"?wherein R(450) and R(550) are phase differences on the film plane at a wavelength of 450 nm and a wavelength of 550 nm, respectively.

patent: 6346578 (2002-02-01), Arakawa
patent: 6433102 (2002-08-01), Suzuki et al.
patent: 6565974 (2003-05-01), Uchiyama et al.
patent: 6638582 (2003-10-01), Uchiyama et al.
patent: 61-024449 (1986-02-01), None
patent: 63-043910 (1988-02-01), None
patent: 01-104642 (1989-04-01), None
patent: 2609139 (1990-08-01), None
patent: 02-285304 (1990-11-01), None
patent: 04-075001 (1992-03-01), None
patent: 06-107736 (1994-04-01), None
patent: 6-107736 (1994-04-01), None
patent: 07-256664 (1995-10-01), None
patent: 11-302440 (1999-11-01), None
patent: 11-302440 (1999-11-01), None
patent: 2000-169521 (2000-06-01), None
patent: 2000-169521 (2000-06-01), None
patent: 2000-212226 (2000-08-01), None
patent: 2000-212226 (2000-08-01), None
patent: 2001-48924 (2001-02-01), None
patent: 2001-048924 (2001-02-01), None
patent: WO 9964501 (1999-12-01), None


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