Process for preparing an optical retardation film

Details Process for preparing an optical retardation film Process for preparing an optical retardation film

1999-07-30

2001-07-17

Dudek, James A. (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

C379S124000, C379S126000

Reexamination Certificate

active

06262788

ABSTRACT:

The invention relates to a process for preparing an optical retardation film comprising at least one layer of an anisotropic polymer material, characterized in that said process comprises the following steps
A) rubbing a continuously moving substrate with at least one rubbing roller,
B) coating a layer of a polymerizable mesogenic material, a liquid crystal polymer or a liquid crystal oligomer onto the rubbed surface of said substrate,
C) optionally polymerizing and/or crosslinking the coated material of step B) by exposure to heat or actinic radiation,
D) optionally repeating steps B) and C) at least one more time, and
E) optionally removing the polymer film from the substrate.
The invention further relates to a method of rubbing a substrate for the alignment of liquid crystal or mesogenic material that can be used in the above process. The invention also relates to an optical retardation film obtainable by the above process, to the use of such an optical retardation film in a liquid crystal display, and to a liquid crystal display device comprising a liquid crystal cell and such an optical retardation film.
Upon further study of the specification and appended claims, further objects and advantages of this invention will become apparent to those skilled in the art.


REFERENCES:
patent: 5668615 (1997-09-01), Miyata
patent: WO 98/04651 (1998-02-01), None
patent: WO 98/12584 (1998-03-01), None

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