Sulphonic fluorinated ionomers

Details Sulphonic fluorinated ionomers Sulphonic fluorinated ionomers

2005-12-27

2005-12-27

Lipman, Bernard (Department: 1713)

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

Synthetic resins

Ion-exchange polymer or process of preparing

C526S243000, C526S247000, C526S250000, C526S252000

Reexamination Certificate

active

06979699

ABSTRACT:
Sulphonic fluorinated ionomers crosslinked by radical crosslinking of:A) crosslinkable sulphonic fluorinated ionomers, having equivalent weight 380-1300 g/eq and comprising: from 48% to 85% by moles of monomeric units deriving from tetrafluoroethylene (TFE);from 15% to 47% by moles of fluorinated monomeric units containing sulphonyl groups —SO2F; from 0.01% to 5% by moles of monomeric units deriving from a bis-olefin of formula:wherein: m=2-10, preferably 4-8; R1, R2, R5, R6, equal to or different from each other, are H or C1-C5alkyl groups;B) a fluorinated compound as crosslinking radical initiator;C) a fluorinated bis-olefin of structure (I) as crosslinking agent;the radical crosslinking being carried out at a temperature in the range 250° C.-310° C., preferably 260° C.-300° C.

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Database WPI, Section Ch, Week 197817, Derwent Publications Ltd., London, GB, AN 1978-31300A, XP-002184196.

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