Transparent polyamides for mouldings (films) - obtd. from 1,3-and 1,4-bis (aminomethyl) cyclohexane, linear aliphatic diamine and aromatic dicarboxy-lic acid

Title polyamides having high transparency, good impact strength, dielectric props. etc. are produced by polycondensn. of diamines and dicarboxylic acids or their acid halides, esters, nitriles or amides using (a) a mixt. of (A) 50-100 (65-100) mole % 1,3- and 50-0 (35-0) mole % 1,4-bis-(aminomethyl)-cyclohexane and (B) linear aliphatic 4-20 (4-12) esp. 6C diamine(s) and/or tetramethylenediamine(s) with >=1 alkyl substit(s). on the C chain and/or pentamethylenediamine(s) with alkyl substit(s). in the 1- or 3- or several position(s) on the C chain and/or 2-alkyl-pentamethylene(s) with not 2C in the alkyl gp. and/or linear aliphatic 6-20 (6-12) esp. 6C diamine(s) with >=1 alkyl substit(s). the amt. of (B) being 5-90 (20-60) mole % w.r.t. (A) + (B); and (b) aromatic 6-20 (8-14)C, esp. mononuclear dicarboxylic acid(s) or deriv(s). with -COOH in the m- or p-position. The polyamides are suitable for use at high temps.