TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The mixture of diamines comprises (wt.%): cis-1,3-cyclohexanebis(methylamine) (20-50, preferably 36), trans-1,3-cyclohexanebis(methylamine) (5-35, preferably 18), cis-1,4-cyclohexanebis(methylamine) (5-30, preferably 13), and trans-1,4-cyclohexanebis(methylamine) (15-50, preferably 33). The mixture of diisocyanates comprises (wt.%): cis-1,3-bis(isocyanatomethyl)cyclohexane (20-50, preferably 36), trans-1,3-bis(isocyanatomethyl)cyclohexane (5-35, preferably 18), cis-1,4-bis(isocyanatomethyl)cyclohexane (5-30, preferably 13), and trans-1,4-bis(isocyanatomethyl)cyclohexane (15-50, preferably 33). The dicarboxylic acid comprises a mixture of at least two different dicarboxylic acids. Each dicarboxylic acid is an alpha , Omega -dicarboxylic acid (preferably adipic acid, dodecanedioic acid, or azelaic acid, especially adipic acid or dodecanedioic acid). The dicarboxylic acid derivative is a dicarboxylic acid monoester; dicarboxylic acid diester; dicarboxylic acid monoester monoacid chloride; dicarboxylic acid monoacid chloride; dicarboxylic diacid chloride; or dicarboxylic anhydride. EXAMPLE - A cyclohexanebis(methylamines) mixture comprising (wt.%): cis-1,3-cyclohexanebis(methylamine) (36), trans-1,3-cyclohexanebis(methylamine) (18), cis-1,4-cyclohexanebis(methylamine) (13), and trans-1,4-bis cyclohexanebis(methylamine) (33) and having a total purity of greater than 99.8% was prepared. A polyamide (test) was prepared by mixing adipic acid (15.20 g) and cyclohexanebis(methylamines) mixture 1 (14.80 g). The polyamide (test) was semi-crystalline. A control polyamide was prepared similarly as test, except using 4,4'-methylenebis(2-methylcyclohexylamine) (15.26 g) instead of cyclohexanebis(methylamines) mixture 1 and dodecanedioic acid (14.74 g) instead of adipic acid. The resulting polyamide was amorphous, with no evidence of crystallization or melting. The test/control polyamide showed glass transition temperature (Tg) of 109 degrees C/153 degrees C.