Verwendung von Loesungen von Polyurethanmischpolymerisaten zur Herstellung von elastischen Faeden,Folien u.dgl

Elastomeric filaments or films are formed of linear segmented urea/urethane/ether copolymers having an inherent viscosity of at least 3.0 when dissolved in 60% phenol and 40% tetrachloroethane, and comprising 2-40% by wt. of urea segments each containing one or more repeating units (I) -A-NH-CO-NH-D-NH-CO-NH- and/or one or more repeating units (II) -ANHCONH-, where A is the residue of an organic diisocyanate OCN-A-NCO, and D is the organic residue of a diamine NH2-D-NH2, A and D being such that a polyurea containing only repeating units (1) and having a M.W. > 104 would have a M.P. of at least 200 DEG C. The terminal A of each urea segment is connected to the -NH of a urethane linkage -NHCO-O-, the -O- of which is connected to a polyether residue P, while the terminal - NH of each urea segment is linked to the A of a group -A-NH-CO-O-, the -O- of which is linked to another polyether residue. The polyethers used in making the polymers of this invention have a melting point less than 50 DEG C. and a mol. wt. of 600 to 12,000. They consist of copolyethers containing repeating units (III) -CH2CH2CH2CH2O- an in a ratio III:IV of from 2:1 to 50:1; or of a mixture of such copolyethers, in which the ratio III:IV is 2:1 to 25:1, with not more than their own weight of a homopolyether of formula HO-(CH2CH2CH2CH2-O-)nH If desired, the polyethers may be first reacted with di-isocyanate to form oligomers of up to 11 P residues linked by groups -O-CO-NH-A-NH-CO-O- The segmented polymers are formed in solution by the process claimed and described in Specification 1,118,731, employing, if desired, the features described and claimed in Specifications 1,118,735, 1,118,736 and 1,118,737. The copolyether may be prepared as described in Specification 1,118,602. The diisocyanates and diamines may be aromatic or functionally aliphatic, and the aliphatic ones may or may not be sterically hindered as defined in Specification 1,118,732.