Abstract: Described are carboxyl-terminated polyetheramides of the formula: ##STR1## where R is a moiety from an alcohol or hydroxy compound having a valence of k; R' is independently hydrogen or lower alkyl from 1 to 4 carbon atoms; R" is independently a straight or branched alkylene or aromatic moiety averaging from about 2 to 36 carbon atoms; x averages from about 2 to 100; z averages from about 20 to about 250; k averages from about 1 to 3; m is 0 or 1; and p is independently 5 to 11. Because the carboxyl-terminated polyetheramides are all carboxyl-terminated, they do not gel. They are expected to have good impact strength as well as differing solubilities depending on the polyetheramine incorporated.

Abstract: Amidamines of the following formula are described: ##STR1## where R is independently hydrogen or lower alkyl of 1 to 4 carbon atoms;R' is an alkyl group if k is 1, or an alkylene group if k is greater than 1; where R' has 2 to 18 carbon atoms;R" is independently lower alkylene of 2 to 4 carbon atoms;R'" is independently straight or branched lower alkylene of 2 to 6 carbon atoms;x is independently 1 to 200;y is independently 1 to 300;z is independently 1 to 200;p is independently 2 to 11; andk is from 1 to 8; where the x and z groups may be distributed in blocks or randomly.These compositions are made by reacting a cyclic lactam with an etheramine. Incorporation of increasing quantities of the polyetherpolyamine did not decrease the crystalline melting point (T.sub.m) of the resulting copolymer. The polyamidopolyfunctional amines (poly(amide-ether-amide) triblock copolymers) have a relatively low modulus and retain higher use temperatures than current polyetheramide segment block copolymers.

Abstract: Disclosed is an alternating block copolymer composition useful for enhancing the crystallization of bisphenol-A polycarbonate which comprises the reaction product of a polyoxyalkylene polyamine and poly(ethylene)terephthalate. Also disclosed is a method of synthesizing the alternating block copolymer and a method of using the block copolymer composition in the crystallization of bisphenol-A polycarbonate.