Colorless transparent polyimide shaped article and process for producing the same
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United States of America Patent
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Oct 24, 1989
Grant Date -
N/A
app pub date -
Mar 10, 1986
filing date -
Mar 10, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A colorless transparent polyimide shaped article having as a main component at least one recurring unit selected from the recurring units of the formulae (I) to (IX). It is useful, for example, as an oriented film in liquid crystal display devices. The polyimide shaped article is produced by a process which comprises preparing a solution of a polyamide acid having as a main component at least one recurring unit selected from the recurring units of the formulae (V) to (VIII) in an amide-type organic polar solvent, forming a shaped article of the polyamide acid from the solution, and imidizing the resulting shaped article of the polyamide acid.
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