Patent ID: 11898006
Assignee: SOLVAY SPECIALTY POLYMERS ITALY S.P.A.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 11:
12. The method of claim 11, wherein conditions in Step (5) are adapted to obtain a mixture (PFFCOOH—CF3) comprising any of compounds of formulae (VII), (IX), (X) and (V), wherein the molar ratio between the overall amount of end groups of formula —COOH and of formula —CXF1XF2F, with XF1 and XF2 being F or a C1-C3 perfluoroalkyl group, is between 35:65 to 65:35 and
wherein formula (IX) is as follows:

HOOC—RF—[—CF2—O—CF2CF2—(CRf1Rf2)a—O—Rf—O—(CRf1 Rf2)b—CF2CF2—O—CF2—RF]n′″—F.