(per) fluoropolyether carboxylic acids and use thereof for...

Details (per) fluoropolyether carboxylic acids and use thereof for... (per) fluoropolyether carboxylic acids and use thereof for...

2007-08-07

2007-08-07

Puttlitz, Karl (Department: 1621)

Paper making and fiber liberation

Processes and products

Non-fiber additive

C106S287280

Reexamination Certificate

active

10859580

ABSTRACT:
Carboxylic acids comprising perfluoropolyether chains, of formula:in-line-formulae description="In-line Formulae" end="lead"?T1—CFW1—O—Rf—CFW2—T2  (I)in-line-formulae description="In-line Formulae" end="tail"?wherein T1, T2, equal to or different from each other, are selected from the group formed of —CH2—B—Y—(COOH)n, —CH(CF3) O—Y(COOH)n, —F, —CF3, —C2F5, —(C2F4)Cl, wherein B=—O— or —S—; Y=C1—C20alkylene chain, n=1-4; with the proviso that at least one of the two end groups T1, T2be —CH2—B—Y—(COOH)n, —CH(CF3)O—Y(COOH)n; W1, W2, equal to or different from each other, are —F or —CF3; Rfis a (per)fluoropolyoxyalkylene chain formed of one or more repeating units, statistically distributed along the chain, having a number average molecular weight in the range 500-10,000.

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