Fluorinated polyurethanes containing polyoxyperfluoroalkylene blocks.

摘要

Polyurethanes comprising rubber-like polyoxyperfluoroalkylene blocks and rigid segments derived from low molecular weight compounds and from (cyclo)aliphatic or aromatic diisocyanates, wherein the number of rigid segments is 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 than 30 kg/cm<2> and a hardness of from 50 Shore A to 75 Shore D, and show good thermoforming characteristics.