| abstract |
(57) [Abstract] (Modified) [Purpose] Low molecular weight corresponding fluoropolyethers having neutral and / or functional end groups by selective catalytic cleavage of fluoropolyethers and perfluoropolyethers with high molecular weight And a method for producing perfluoropolyether. [Structure] Silicon dioxide and Al, Ti, V, Cr, Co, Fe, Ni, Mo, Zn, Cu, Cd, Mn, Sb, S n, Zr, Sc, Y, La and homologues, Pb, Mg, And the cleavage is carried out by operating in the presence of a catalyst system consisting of a combination of at least one oxide, fluoride or oxyfluoride of a metal selected from W and W. |