Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1997-07-03
2000-05-09
Speer, Timothy M.
Stock material or miscellaneous articles
Composite
Of inorganic material
428702, 349117, 349118, 359500, B32B 900
Patent
active
060601833
ABSTRACT:
A phase retarder film comprising a layer of polyvinyl alcohol or a derivative thereof and a water-swellable layered inorganic compound, wherein the in-plane retardation value is smaller than the retardation value in the thickness direction, sometimes causes durability failures, that is, the layer is peeled off from a transparent resin substrate in high temperature and high humidity environment. Therefore, the present invention provides a phase retarder film which is superior in durability.
With respect to a phase retarder film comprising at least one layer containing at least one organic clay compound which can be dispersed in an organic solvent, wherein the in-plane retardation value is smaller than the retardation value in the thickness direction, the durability is remarkably improved.
REFERENCES:
patent: 5113285 (1992-05-01), Franklin et al.
patent: 5430566 (1995-07-01), Sakaya et al.
patent: 5631755 (1997-05-01), Sakaya
Handbook of Optics, Driscoll and Vaughan, Eds., Optical Society of America, 1978, pp. 10-108-10-109.
W.G. Driscoll et al., "Handbook", McGraw Hill/Optical Society of America, 1978, pp. 10-103 --10-109.
Higashi Koji
Shimizu Akiko
Speer Timothy M.
Sumitomo Chemical Company Limited
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