Stock material or miscellaneous articles – Surface property or characteristic of web – sheet or block
Patent
1995-03-13
1996-07-30
Nagumo, Mark
Stock material or miscellaneous articles
Surface property or characteristic of web, sheet or block
428 1, 359 76, 359 75, 526247, 526239, 526242, 526243, 526244, 525200, C09K 1956
Patent
active
055409970
ABSTRACT:
An alignment layer for a liquid crystal display device is described. The alignment layer comprises a copolymer of a thermoset polymer containing perfluorinated cyclobutane rings and a thermoplastic polymer containing perfluorinated cylcobutane rings, or a blend of thermoset and thermoplastic homopolymers or copolymers containing perfluorinated cyclobutane rings.
This copolymer or blend provides an alignment layer with a cure temperature of less than 250.degree. C., a low dielectric, and a low moisture content. The resultant alignment layer can also provide surface tilt angles suitable for supertwisted nematic-liquid crystal displays.
REFERENCES:
patent: 5021602 (1991-06-01), Clement et al.
patent: 5023380 (1991-06-01), Babb et al.
patent: 5037917 (1991-08-01), Babb et al.
patent: 5246782 (1993-09-01), Kennedy et al.
patent: 5331081 (1994-07-01), Dubal et al.
Scheffer, et al., Accurate Determination of Liquid-Crystal Tilt Bias Angles, Journal of Applied Physics, vol. 48, No. 5, pp. 1783-1792 (May 1977).
Babb David A.
DeKoven Benjamin M.
Perettie Donald J.
Nagumo Mark
The Dow Chemical Company
Willis Reid S.
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