C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/642.1, 260/6
C07C 41/46 (2006.01) C07C 41/44 (2006.01) C07C 43/12 (2006.01) C08G 65/00 (2006.01) C08G 65/321 (2006.01)
Patent
CA 2008857
HOB 89/F 033 ABSTRACT Process for the purification and stabilization of perfluoropolyethers The invention relates to a process for the stabilization and purification of perfluoropolyethers of the general formulae (I) or (II) (I) Image in which R = -F or -CaF2a+1 R' = -F or -CbF2b+1 n,m = 0,1, ... or 12, n being identical with or different from m, l?n+m?15 a,b = 1,2, ... or 10, a being identical with or different from b (II) R"O[C3F6O]c [C2F4O]d [CFXO]e R"' in which R" = -CfF2f+1 R"' = -CgF2g+1 X = -F or -CF3 c,d,e = integers such that the molecular weight of the perfluoropolyether is between 200 and 2000, where c, d and e may be identical or different and the units [C3F6O]c, [C2F4O]d, and [CFXO]e may be randomly distributed along the molecu- lar chain of the perfluoropolyether, or of mixtures of perfluoropolyethers of this type. The process comprises heating the perfluoropolyethers or mixtures thereof to 150-360°C in the presence of a catalyst which contains one or more elements from groups IA, IIA, IIIA, IVA or IVB or compounds thereof.
Fetherstonhaugh & Co.
Gries Thomas
Hoechst Aktiengesellschaft
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