The rubber way the fluorine conversion polyurethane null where the machine property which contains polyoxy perfluoro- alkylene structural burotsuku and hydrogenation hard burotsuku is improved

摘要

Polyurethanes comprising rubber-like polyoxyperfluoroalkylene blocks and rigid segments derived from short-chain aliphatic diols and/or aliphatic or aromatic diamines and from (cyclo)aliphatic or aromatic diisocyanates, wherein the number of rigid segments is equal to or higher than the number of rubber-like blocks are described. Said polyurethanes are characterized by a glass transition temperature lower than -80 DEG C, a tensile strength higher that 30 kg/cm2 and a hardness of from 50 Shore A to 75 Shore D and show good thermoforming characteristics.