abstract |
The invention relates to a difunctional perfluoro-polyether oil, prepared by nreacting a perfluoropolyether diol oil having a weight averaged molecular weight n(Mw) between 1500 and 3000 with a chain lengthener from the group of diacid nchlorides and diisocyanates, and to perfluoropolyether rubbers prepared by means nof these chain-lengthened oils. |