POLYURETANUREA CONTAINING MACROHETEROCYCLIC FRAGMENTS IN THE MAIN CHAIN AS A MATERIAL FOR PREPARING OF DIAPHRAGMS SHOWING SORPTION CAPACITY WITH RELATION TO ALKALINE AND HEAVY METAL IONS Russian patent published in 1994 - IPC

FIELD: material for diaphragm making. SUBSTANCE: the main chain of polyurethanurea has fragments of the general formula where at n = 12 or 18; at n = 2; R₁: [OC(CH₂)₄-COO(CH₂)₄O]_n at n = 10; at n = 6; , -(CH₂)₆-. Polyurethanurea with indicated fragments in the main chain is synthesized by interaction of prepolymer with terminal isocyanate groups, in the form of solution in dimethylformamide with diaminodibenzo-18-kraun-6, at the room temperature for 2 h. EFFECT: improved method of polymer preparing. 2 tbl