Copolyamides from an isomeric mixture of heptadecane dicarboxylic acid

A noncrystalline, moisture insensitive polyamide consisting essentially of an amidification product of an acid component of (a) 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 (b) an acid which is isophthalic acid, terephthalic acid, alkyl substituted isophthalic acid wherein the alkyl radical has from 1 to 12 carbon atoms or mixtures thereof;
• wherein the equivalent percentage of the heptadecane dicarboxylic acid in the acid component is from about 15 to 80% and of the acid which is isophthalic acid, terephthalic acid, alkyl substituted isophthalic acid or mixtures thereof is from about 85 to 20% based on the total acid component;
• and a diamine component which is hexamethylene diamine, or trimethylhexamethylene diamine, wherein the equivalents of the acid component and the diamine component 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. by weight and at a temperature of 30.degree.C.
• The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: