| 摘要 |
PURPOSE:To produce a phase-difference film stabilized in quality, with the film forming rate increased and consisting of a polysulfone polymer by preventing nonuniform or insufficient stripping when the film is stripped. CONSTITUTION:A phosphoric ester compd. shown by the formula is added to a soln. of polysulfone polymer in org. solvent, the soln. is cast into a film, and the film is drawn. In the formula, R<1> is alkyl, alkenyl and aryl or an aryl having an alkyl or an alkenyl, R<2> is a hydrocarbonic group, L<1> is a bivalent connecting group, N1 is 0 or 1, M<1> us hydrogen atom or cation, and R<3> is M<2> or R<4>-(L<2>)n2-R<5>-. R<4> is syninymous with R<1>, L<2> with L<1>, n2 with n1, R<5> with R<2> and M<2> with M<1>. |
