Crystalline copolyamide from terephthalic acid, isophthalic acid and C.sub. 6
 A crystalline polyamide which has improved tensile strength and which has a heat deflection temperature in excess of 240.degree. C. when filled is formed from dicarboxylic acid compounds comprising compounds of terephthalic acid and isophthalic acid in a molar ratio of at least 80:20 to about 99:1 and diamines comprising hexamethylene diamine and trimethylhexamethylene diamine in a molar ratio of about 98:2 to about 60:40. 
Amoco Corporation
C
C08G
inventional
Yu-Tsai Edward E. Wassily
Chen Paschke Poppe