| 摘要 |
The invention relates to a process for the stabilization and purification of perfluoropolyethers of the general formulae (I) or (II) <IMAGE> (I) 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, 1</=n+m</=15 a,b=1,2, . . . or 10, a being identical with or different from b R''O[C3F6O]c[C2F4O]d[CFXO]eR''' (II) 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 molecular chain of the perfluoropolyether, or of mixtures of perfluoropolyethers of this type. The process comprises heating the perfluoropolyethers or mixtures thereof to 150 DEG -360 DEG C. in the presence of a catalyst which contains one or more elements from groups IA, IIA, IIIA, IVA or IVB or compounds thereof. |
| 申请人 |
HOECHST AG, 6230 FRANKFURT, DE |
发明人 |
GRIES, THOMAS, DR., 6230 FRANKFURT, DE |
