Amidification products of C.sub.19 dicarboxylic acid and cyclical diamines

A polyamide consisting essentially of the amidification product of a mixture of isomers of heptadecane dicarboxylic acid having the formula:

• ##EQU6## wherein x is an integer from 1 to 15, y is an integer from 1 to 15 and the sum of x and y is 16, and a cyclical diamine bis(4-aminocyclohexyl)methane, wherein the equivalents of the dicarboxylic acid and the diamine are substantially equal, wherein the amidification reaction is conducted at a temperature between about 100.degree.C. and 300.degree.C., and wherein the amidification product has a logarithmic viscosity number of about 30 to 150 as measured in orthochlorophenol solvent at a concentration of 0.005 g./ml. at a temperature of 30.degree.C.