PROBLEM TO BE SOLVED: To provide a wholly aromatic polyamide solution, methods for producing the wholly aromatic polyamide solution and wholly aromatic polyamide powder, an N-substituted wholly aromatic polyamide and a method for producing the powdery material of the same.;SOLUTION: This wholly aromatic polyamide solution is produced by mixing the wholly aromatic polyamide with a solvent consisting of the combination of a quaternary ammonium salt expressed by general formula: N(R1)(R2)3-F [wherein, R1 is a linear or branched 1-18C alkyl, phenyl or benzyl; and R2 is a 1-4C alkyl] with an aprotic polar organic solvent, and then heating for dissolving. In the above solution, the N-substituted wholly aromatic polyamide is produced by reacting the wholly aromatic polyamide with a halogen compound expressed by general formula: X-(R3)-Y [wherein, R3 is a 1-21C linear or branched alkylene; X is a halogen group selected from Cl or Br; and Y is a group selected from -CH3, -CH=CH2, -phenyl and a 1-9C alkylaryl group (aralkyl group)] in the presence of sodium hydride.;COPYRIGHT: (C)2009,JPO&INPIT
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