| 摘要 |
PURPOSE:To obtain the titled dope useful for the production of pulp, film, or fiber having excellent strength, etc., by mixing a mixture of an aprotic polar solvent and a non-solvent with a soln. of an arom. nitrogen-contg. polymer in said aprotic polar solvent. CONSTITUTION:A mixture consisting of an aprotic polar solvent (A) and a non- solvent (B) (e.g. water or methanol) selected from among water and aliph. compds. which can not dissolve an arom. nitrogen-contg. polymer described below and has compatibility with the solvent A, is mixed with a soln. consisting of 5-50wt% arom. nitrogen-contg. polymer contg. nitrogen atoms and a unit of formula I [wherein Y is O, S, SO2, CO, C(CH3)2, CH2] in the polymer chain (e.g. a polymer of formula II or III) and the aprotic polar solvent (e.g. N-methyl-2- pyrrolidone) with stirring in such a proportion as to give a weight ratio of the solvent to the non-solvent of 100/10-60 in the resulting mixture, thus obtaining the titled dope.
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