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

1997-01-31

1998-06-02

Tucker, Philip

Compositions

Light transmission modifying compositions

524108, 528175, F21V 900, C08K 515

Patent

active

057594490

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: 4156068 (1979-05-01), Hartmann
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).
Patent Abstracts of Japan vol. 009, No. 300 (M-433), 27 Nov. 1985, & JP-A-60-137618 (Misui Toatsu Kagaku KK) 22 Jul. 1985.
Database WPI Section Ch, Week 8535 Derwent Publications Ltd., London, GB Class A85, AN 85-214533 and JP-A-60-138-514 (Mitsui Toatsu Chem Inc), Jul. 23, 1985.
The Merck Index, Tenth Edition, 1983, p. 869.

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