(per) fluoropolyether carboxylic acids and use thereof for the oleo-repellent paper sizing

US7252740B2 · kind B2 · utility

Assignee

• SOLVAY SOLEXIS S.P.A. · IT

Inventors

• Antonio Russo · Milano, IT
• Claudio Tonelli · Vimercate, IT
• Mario Visca · Alessandria, IT

Key dates

• Filing date: Jun 3, 2004
• Grant date: Aug 7, 2007
• Expiry date: Jun 30, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/3322
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Carboxylic acids comprising perfluoropolyether chains, of formula:T1—CFW1—O—Rf—CFW2—T2  (I)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—C20 alkylene chain, n=1-4; with the proviso that at least one of the two end groups T1, T2 be —CH2—B—Y—(COOH)n, —CH(CF3)O—Y(COOH)n; W1, W2, equal to or different from each other, are —F or —CF3; Rf is 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.