Process for preparing regulated molecular weight perfluoro-polyethers having neutral and functional end groups
AssigneeMontedison S.p.A.
InventorsGerardo Caporiccio, Gian T. Viola, Giuseppe Marchionni, Pio De Iorio, Adriana Tasca
Life of this patent
Estimating the term…
Abstract
A process for the dissociation of high molecular weight perfluoropolyethers to obtain low molecular weight perfluoropolyethers which comprises treating a perfluoropolyether with 0.1-10% by weight of a catalyst consisting of Ti, Cr, Mn, Fe, Co, Ni, V, Cu, Mo, Sn, Sb, Zr, Zn oxides at temperatures comprised between 150.degree. and 380.degree. C.
Claims6
A process for the dissociation of perfluoropolyethers obtained from photo-oxidation processes of perfluoroolefins or by anionic polymerization of their epoxides which comprises heating the perfluoropolyether to a temperature from 150.degree. to 380.degree. C. in the presence of 0.1-10% by weight of catalysts comprising:
- oxides of the following metals:
- Ti, Cr, Mn, Fe, Co, Ni, V, Cu, Mo, Sn, Sb, Zr, Zn;
- or fluorides and oxyfluorides of:
- Co, Mn, Fe, Cu, Mo, Sn, Sb, Zr, Zn.
Dependencies are inferred from the claim text.