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

Claim 10:
11. The method according to claim 1, wherein in Step (5), the amount of molecular fluorine used in Step (5) is adjusted for generating a mixture (PFFCOOH—CF3) comprising any of compounds of formulae:

HOOC—RF—[—CF2—O—CF2CF2—(CRf1Rf2)a—O—Rf—O—(CRf1Rf2)b—CF2CF2—O—CF2—RF]n′″—COOH;   formula (VII)

HOOC—RF—[—CF2—O—CF2CF2—(CRf1Rf2)a—O—Rf—O—(CRf1Rf2)b—CF2CF2—O—CF2—RF]n′″—F   formula (IX)

F—RF—[—CF2—O—CF2CF2—(CRf1Rf2)a—O—Rf—O—(CRf1Rf2)b—CF2CF2—O—CF 2—RF]n′″—F;   formula (X)

and optionally comprising a minor amount of any compounds of formula (V), wherein in formulae (VII), (IX), (X) and (V).