Process for preparing perfluoropolyoxyalkylenes with -OCF2H,...

Details Process for preparing perfluoropolyoxyalkylenes with -OCF2H,... Process for preparing perfluoropolyoxyalkylenes with -OCF2H,...

2005-02-22

2005-02-22

Puttlitz, Karl (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C568S617000

Reexamination Certificate

active

06858757

ABSTRACT:
A process for preparing perfluoropolyoxyalkylenes having —OCF2H, —OCF2CF2H and —OCF(CF3)H end groups and a number average molecular weight from 120 to 3,000, by decarboxylation of the corresponding perfluoropolyoxyalkylenes having —OCF2COOH, —OCF2CF2COOH, —OCF(CF3)COOH end groups, in the presence of catalytic amounts of salts formed by perfluoropolyoxyalkylenes having end groups selected from —OCF2COOZ, —OCF2CF2COOZ and —OCF(CF3)COOZ, wherein Z is a monovalent cation of the group Ia or Ib or Z is —NR4+wherein R is hydrogen or a C1-C4alkyl, 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.

REFERENCES:
patent: 5969192 (1999-10-01), Marchionni et al.
patent: 0 695 775 (1996-07-01), None

Affiliated with

Also associated with

Rating

Process for preparing perfluoropolyoxyalkylenes with -OCF2H,... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for preparing perfluoropolyoxyalkylenes with -OCF2H,..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparing perfluoropolyoxyalkylenes with -OCF2H,... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3490454