New functionalized perfluoropolyethers and process for the prepa

Details New functionalized perfluoropolyethers and process for the prepa New functionalized perfluoropolyethers and process for the prepa

1986-11-13

1988-01-19

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

568615, 260544F, 562586, 528485, C07C 5158, C07C 4904, C08G 6532

Patent

active

047205270

ABSTRACT:
A process for the scission of high molecular weight perfluoropolyethers having neutral end groups obtained from photo-oxidation processes of perfluoroolefins, or fluorination of hydrogenated polyalkylene oxides, or by polymerization with opening of the partially fluorinated oxetane ring, said scission being carried out in the presence of catalysts composed of fluorides, oxyfluorides, or oxides of transition metals, or of Al, Sn, Sb, at temperatures ranging from 150.degree. to 380.degree. C.; said scission process leads to the formation of low molecular weight perfluoropolyethers having neutral and acid end groups, the perfluoropolyethereal acids being subjectable to conversion reactions in order to obtain functionalized perfluoropolyethers and to be utilized to provide new polymers.

REFERENCES:
patent: 2854490 (1958-09-01), Fischer et al.
patent: 3242218 (1966-03-01), Miller
patent: 3847978 (1974-11-01), Sianesi et al.

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