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

Claim 9:
10. The method according to claim 1, wherein in Step (4), mixture (PFFOC(O)F—OC(O)F) is submitted to hydrolysis conditions in the presence of water, resulting in a mixture (PFFCOOH—COOH) comprising a major amount of a perfluorinated di-carboxylic acid compound of formula (VII):
HOOC—RF—[—CF2—O—CF2CF2—(CRf1Rf2)a—O—Rf—O—(CRf1Rf2)b—CF2CF2—O—CF2—RF]n′″—COOH, and possibly comprising a minor amount of a compound of formula (V).