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?????? ?? ??? ?????? ???? ?? ?????, 1937? ??? Otto Bayer? ?? ????? ?? ?????. ? ? ?????? ? 50??? ??? ??, ??? ?? ???? ???? ?????. Otto Bayer ?? diisocyanate? ??? ???? ???? diisocyanate? diamine? ??? ?? ??? ???? ?????. ??? ? ??? ??? ?? ???? ?? ? ???? ??, ??? ???? ??? ???? ????. ? ? 1,4-butanediol?? ??? ??? ??? ?????? ??? ??? ??? ?? ?????? ??????, ??? ??? ????? ??? ??? ????? ????? ????. ?????? ??? ???? ??? ?? ???? ?????, ?? ?? ??? ??? ? ?????? ??? ??? ???? ???? ? ?? ??? ???? ?? ????? ??? ???? ????. ??????? ???? ????? "????"? U.S. FEDERAL TRADE COMMISSION? ?? ??? ?? ?????. "A MANUFACTURED FIBER IN WHICH THE FIBER FORMING SUBSTANCE IS A LONG CHAIN SYNTHETIC POLYMER COMPRISED OF AT LEAST 85% OF SEGMENTED POLYURETHANE". ????? ???? ?? ??? ??? ???? ????? rubber thread? ??????, ?? ???? ???? rubber thread? ?? ????? ???? ??. Rubber thread? ?? latex? ????? rubber sheet? ?? ??? ??? ??? coarse denier? ???. ??? ???? ????? ???? ????? ??? ?????, ?? modulus? ????, ??? ??????? ???? ? ?? ??? ??????. ?? ?? ????? ???? ??? ??? ? ???, rubber thread? ?? ?? modulus, ????? ????.