Retardation film and liquid crystal display device using the same
AssigneeNippon Oil Co., Ltd.
InventorsShinichi Komatsu, Toshikatsu Shoko, Tadahiro Kaminade
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Abstract
A retardation film, formed by stretching a film including a norbornene-based, ring-opening polymer containing a structural unit (A) represented by a formula (1), has high transparency, excellent wavelength dispersion characteristics in a single layer, is capable of providing specific retardation to broadband light, is extremely adhesive to other materials, is capable of attaining optical characteristics that are unique among negative birefringence characteristics, and is capable of providing a reverse dispersion of birefringence wavelength dispersion characteristics. The present invention also provides a liquid crystal display device using the foregoing film.
Claims12
A retardation film, formed by stretching a film comprising a norbornene-based ring-opening polymer containing a structural unit (A) represented by the following general formula (1):
- wherein,
- n represents an integer of any one of 0 and 1,
- X1 represents any one of a group represented by a formula:
- —CH═CH— and a group represented by a formula:
- —CH2CH2—,
- R1, R2, R3, and R4, which may be the same or different, each represent any one of atoms and groups selected from the group consisting of:
- a hydrogen atom;
- halogen atoms;
- substituted or unsubstituted hydrocarbon groups, each of which may include at least one linking group selected from the group consisting of an oxygen atom, a nitrogen atom, a sulfur atom, and a silicon atom, and which has 1 to 30 carbon atoms;
- and polar groups,
- wavy lines a and b each represent a configuration of any one of an endo and an exo, and
- a wavy line c represents a configuration of any one of an endo and an exo,
- wherein a content percentage of a structural unit (A-1), in which the wavy line c represents an exo configuration, among the structural units (A) is in a range from 20 mol % to 100 mol %.
Dependencies are inferred from the claim text.