Fluorinated ionomers

US6767977B2 · kind B2 · utility

Assignee

• Ausimont S.p.A. · IT

Inventors

• Vincenzo Arcella · Milano, IT
• Alessandro Ghielmi · Frankfurt am Main, DE
• Giulio Tommasi · Milano, IT

Key dates

• Filing date: Dec 20, 2002
• Grant date: Jul 27, 2004
• Expiry date: Dec 20, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F216/1475
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Semicrystalline sulphonic fluorinated ionomers having an equivalent weight higher than 700 g/eq, up to 1,700, comprising:(A) monomeric units deriving from one or more fluorinated monomers containing at least one ethylene unsaturation;(B) fluorinated monomeric units containing sulphonyl groups —SO2F in such amount to give the above equivalent weight, deriving from F2C═CF—O—(CF2)q—SO2F, q being an integer equal to 2 or 3;and having the following properties for a TFE/(B) copolymer:hydration, expressed in % of H2O at 100° C. absorbed by the film prepared from the ionomer and after tranformation from the —SO2F form into the —SO3H form, having the following values:at  750 EWhigher than55%,pref.>70%at  850 EW″45%,″>55%at1,000 EW″35%,″>40%at1,100 EW″28%,″>32%at1,200 EW″23%,″ >25%.