Liquid crystal element
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United States of America Patent
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Jul 3, 1990
Grant Date -
N/A
app pub date -
Jan 22, 1988
filing date -
Jan 23, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed is a liquid crystal element with an improved orientation layer and a coating composition for forming such an orientation layer. The orientation layer consists essentially of a polymer with a Mark-Houwink coefficient of not less than 0.85, the Mark-Houwink coefficient being represented by the formula [I]: [.eta.]=K.multidot.M.sup..alpha. [I] wherein [.eta.] represents intrinsic viscosity of the polymer determined by solution viscosity measuring method, K represents a constant, M represents molecular weight of the polymer, and .alpha. represents the Mark-Houwink coefficient. The coating composition comprises a polyfumaric acid ester represented by the formula [I]: ##STR1## wherein R.sup.1 and R.sup.2, are the same or different and each represents a straight or branched alkyl group, cycloalkyl group, haloalkyl group, silalkyl group or siloxanylalkyl group; and a halogen-containing organic solvent.
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