Patent ID: 8822629

Claim:
A method of preparing a heat-resistant polyamide, the method comprising: introducing into a reactor a monomer mixture comprising a diester compound represented by Chemical Formula 1 wherein at each occurrence R 1 is independently chosen from methyl, ethyl, propyl, butyl, and phenyl, and a liquid-phase diamine compound represented by Chemical Formula 2 H 2 N—R 2 —NH 2 Chemical Formula 2 wherein, R 2 is independently chosen from hexamethylene and 2-methyl-1,5-pentanylene; increasing the internal temperature of the reactor to about 65° C. or more; and carrying out a condensation polymerization comprising increasing the reaction temperature to a temperature that is about 340° C. to about 400° C. and that is equal to or greater than the melting point of the heat resistant polyamide, and stirring the reactants for about 1 hour to about 3 hours, to give the heat resistant polyamide comprising a repeating unit represented by Chemical Formula 3 wherein the condensation polymerization is carried out neat.