Film of aromatic polyethersulfone, process for the production th

Details Film of aromatic polyethersulfone, process for the production th Film of aromatic polyethersulfone, process for the production th

1998-02-12

1999-09-28

Tucker, Philip

Compositions

Light transmission modifying compositions

Producing polarized light

252582, 524108, 345 87, F21V 914, C08J 515

Patent

active

059583053

ABSTRACT:
An optically isotropic film of an aromatic polyethersulfone, which is useful as a substrate for a liquid crystal display device, and an optically anisotropic, uniaxially oriented film of an aromatic polyethersulfone, which is useful as a phase difference plate for a liquid crystal display device. The optically isotropic film is produced by casting an aromatic polyethersulfone solution composition comprising 15 to 40 parts by weight of a solvent which contains at least 60% by weight of 1,3-dioxolane and can dissolve an aromatic polyethersulfone and 10 parts by weight of the aromatic polyethersulfone, on a substrate, and heating the cast solution composition containing a solvent to evaporate the solvent off.

REFERENCES:
patent: 4065437 (1977-12-01), Blinne et al.
patent: 4156068 (1979-05-01), Hartmann
patent: 5611985 (1997-03-01), Kobayashi et al.
New Linear Polymers, McGraw-Hill Book Company, pp. 102-107, (1967).
Recent Tendency of LCD Display Polymer Material, Electrode Substrate Films, pp. 20-23, (1993).
Optical Designing of Simple Matrix ST LCD, Akio Murayama et al., (pp. 267-268), (1993).
STD-LCD phase Difference Film, Yasuo Fujimura et al. (pp. 37-41), (1991).

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