Fiber of wholly aromatic copolyamide from 2,6-naphthalene dicarboxylic acid and 3,4'-diaminodiphenylether
AssigneeTeijin Limited
InventorsTsutomu Kiriyama, Toshihiro Santa
Life of this patent
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Abstract
A wholly aromatic copolymer and a shaped article thereof having an excellent mechanical property, high resistances to heat and chemicals, and a satisfactory processability, is composed of (1) an aromatic dicarbonyl moiety consisting of recurring dicarbonyl units (A) and (B): ##STR1## and (2) an aromatic diamine moiety consisting of recurring diamine units (C) and (D): ##STR2## and the recurring dicarbonyl units (B) being in an amount of 0.01 molar % or more but less than 20 molar % based on the total molar amount of the dicarbonyl moiety (1), and the recurring diamine units (D) being in an amount of 60 molar % or less but more than 20 molar % based on the total molar amount of the diamine moiety (2).
Claims3
A wholly aromatic copolyamide fiber comprising a wholly aromatic copolyamide consisting essentially of an aromatic dicarbonyl moiety consisting of the recurring dicarbonyl units of the formulae (A) and (B):
- ##STR7## and an aromatic diamine moiety in a substantially equimolar amount to the aromatic dicarbonyl moiety and consisting of the recurring diamine units of the formulae (C) and (D):
- ##STR8## said recurring dicarbonyl units of the formula (B) being in an amount of 0.05 molar % to 15 molar % based on the total molar amount of the aromatic dicarbonyl moiety, and said recurring diamine units of the formula (D) being in an amount of 60 molar % but more than 20 molar % based on the total molar amount of the aromatic diamine moiety, said fiber having a tensile strength of 28.5 g/d or more.
Dependencies are inferred from the claim text.