Process for producing aromatic polyamides

Details Process for producing aromatic polyamides Process for producing aromatic polyamides

C - Chemistry, Metallurgy

08

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C08G 69/28 (2006.01) C08G 69/26 (2006.01) C08G 69/32 (2006.01) D01F 6/80 (2006.01)

Patent

CA 1040792

PROCESS FOR PRODUCING AROMATIC POLYAMIDES Abstract of the Disclosure A process for producing novel aromatic polyamides having excellent heat resistance, toughness and chemical re- sistance and further having improved solubility, molding pro- perties and light resistance, which comprises polycondensing a mixed diamine consisting of piperazine and p-phenylenedi- amine with a substantially equimolar amount of terephthaloyl dihalide in at least one amide type polar solvent (e.g. hexa- methylphosphoramide or N-methyl-2-pyrrolidone, alone or a mix- ture thereof), wherein said piperazine is present in the mixed diamine in an amount of 10 to 35 mol % based on the whole mixed diamine component, and fibers produced from the aromatic polyamides having high tenacity, flexing characteristics and wear resistance and further having improved elongation ratio, knot tensile strength, fatigue resistance and fibrillation resistance.

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