| abstract |
Regular copolyamides of the formula OOOO PARALLEL PARALLEL PARALLEL PARALLEL -HN-(CH2)x-NH-C-(CH2)y-C-NH-(CH2)x-NH-C-R-C- n WHERE X IS 2 TO 10, Y IS 0 TO 8, R is a divalent aliphatic or aromatic radical having 1 to 34 carbon atoms, and n is not less than 10, are prepared by reacting an aliphatic diester with an excess of an aliphatic diamine to form a diamine diamide, and reacting the diamine diamide intermediate with an aliphatic or aromatic diacid chloride. |