Polycarbonate-containing liquid chemical formulation and method for making polycarbonate film
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United States of America Patent
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Jan 30, 2001
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app pub date -
Feb 28, 1997
filing date -
Feb 28, 1997
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Abstract
A liquid chemical formulation suitable for making a thin solid polycarbonate film of highly uniform thickness is formed with polycarbonate material, a liquid that dissolves the polycarbonate, and possibly one or more other constituents. The liquid is typically capable of dissolving the polycarbonate to a concentration of at least 1% at 20.degree. C. and 1 atmosphere. The liquid also typically has a boiling point of at least 80.degree. C. at 1 atmosphere. Examples of the liquid include pyridine, a ring-substituted pyridine derivative, pyrrole, a ring-substituted pyrrole derivative, pyrrolidine, a pyrrolidine derivative, and cyclohexanone. In forming the polycarbonate-containing film, a liquid film (36A) of the liquid chemical formulation is formed over a substructure (30). The liquid film is processed to largely remove the liquid and convert the polycarbonate into a solid film (38).
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