Elastic amide/urethane/ether copolymers and process for making the same

Claim 1

A PROCESS FOR PREPARING A LINEAR AMIDE/URETHANE/ ETHER COPOLYMER WHICH COMPRISES CONDENSING AS ESSENTIALLY THE SOLE POLYMER-FORMING INGREDIENTS (A) ONE MOLAR EQUIVALENT OF AN ORGANIC DIAMINE CONTAINING AT LEAST ONE HYDROGEN ATOM ATTACHED TO EACH OF THE NITROGEN ATOMS THEREOF AND (B) ONE MOLAR EQUIVALENT OF A MIXTURE OF (1) A POLYAMIDE-FORMING DERIVATIVE OF AN ORGANIC DIBASIC ACID SELECTED FROM THE GROUP CONSISTING OF DISULFONIC ACIDS AND DICARBOXYLIC ACIDS, AND (2) A BIS (HALOFORMATE) OF A POLYETHER GLYCOL HAVING A MOLECULAR WEIGHT ABOVE ABOUT 400 AND A MELTING POINT BELOW ABOUT 50*C. AND CONSISTING ESSENTIALLY OF DIVALENT HYDROCARBON GROUPS JOINED BY INTRALINEAR ETHER OXYGEN ATOMS, THE PROPORTIONS OF THE INGREDIENTS IN (B) BEING SO SELECTED THAT ABOUT 60-90% BY WEIGHT OF SAID COPOLYMER IS CONTRIBUTED BY THE SAID POLYETHER GLYCOL, WITH THE PROVISO THAT THE SAID ORGANIC DIAMINE AND THE SAID DERIVATIVE OF A DIBASIC ACID ARE SO SELECTED THAT IF REACTED ALONE THEY WOULD FORM A FIBER-FORMING POLYAMIDE HAVING A MELTING POINT OF AT LEAST ABOUT 200*C. IN THE FIBER-FORMING MOLECULAR WEIGHT RANGE.