Many copolymerized polyamides have been synthesized by combinati on of dimethyl isocinchomeronate and several diamines and dicarboxylic acid esters, in which many of them showed suitable melting points and spinning property. For example, a polyamide from dimethyl isocinchomeron ate, tetramethylenediamine, and dimethyl adipate (4: 10: 6) gave a suitable polyamide product having high Young coefficient to answer the object of this experiment and the process has practical value from the standpoint of the raw materials.
An increase of melting point of the copolymerized polyamide with the same copolymer components ratio was observed with an increase in the numbers of meth-ylene groups when a dibasic acid having an even number of methylene group was used and it was attributed to the complexity of factors to determine the melting point of copolymerized polyamide containing isocinchomeronic acid group.
