反应详情

Polyamides derived from cyclohexanebis (methylamine) are known in the prior art. In U.S. Pat. No. 3,012,994 polyamides derived from the condensation of 1,3- or 1,4-cyclohexanebis(methylamine) and a dicarboxylic acid are described. These polyamides possess good stability and strength properties and are described as having relatively high melting points; for example, the polyamide of trans-1, 4cyclohexane-bis(methylamine) and adipic acid has a crystalline melting point of 345° C., whereas nylon 66 formed from hexamethylene diamine and adipic acid has a melting point of only 264° C. However, the high melting point advantage of these polyamides also gives rise to certain inherent disadvantages. For example, polyamides having crystalline melting points much above about 300° C. tend to decompose into degradation products prior to melting. As a result filaments formed from these high melting polyamides generally have poor processability and inferior properties. Although lower melting polyamides can be obtained with trans-1,4cyclohexanebis(methylamine) by condensation with longer chain carboxylic acids, the use of the longer chain acids results in a decrease in the dimensional stability of the resulting polyamide. An object of the present invention is to provide polyamides derived from components comprising a cyclohexanebis(alkylamine) which have good dimensional stability and which have substantially lower melting points than the corresponding polyamides derived from cyclohexanebis(methylamine).