The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 22, 2005
Filed:
May. 21, 2003
Giuseppe Marchionni, Milan, IT;
Gianfranco Spataro, Milan, IT;
Giuseppe Marchionni, Milan, IT;
Gianfranco Spataro, Milan, IT;
Solvay Solexsis S.p.A., Milan, IT;
Abstract
A process for preparing perfluoropolyoxyalkylenes having —OCFH, —OCFCFH and —OCF(CF)H end groups and a number average molecular weight from 120 to 3,000, by decarboxylation of the corresponding perfluoropolyoxyalkylenes having —OCFCOOH, —OCFCFCOOH, —OCF(CF)COOH end groups, in the presence of catalytic amounts of salts formed by perfluoropolyoxyalkylenes having end groups selected from —OCFCOOZ, —OCFCFCOOZ and —OCF(CF)COOZ, wherein Z is a monovalent cation of the group Ia or Ib or Z is —NRwherein R is hydrogen or a C-Calkyl, using ratios between Z and the —COOH equivalents of the perfluoropolyoxyalkylenes to be decarboxylated from 0.01 to 0.08, at a temperature between 120° C. and 180° C., in the presence of water, at pH <5 and at a pressure comprised between 2 and 80 atmospheres.