Process for preparing high purity monocarboxylic...

Details Process for preparing high purity monocarboxylic... Process for preparing high purity monocarboxylic...

2011-08-30

2011-08-30

Keys, Rosalynd (Department: 1621)

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

Organic compounds

Carboxylic acid esters

C560S184000, C562S470000, C562S472000

Reexamination Certificate

active

08008523

ABSTRACT:
A process for preparing monocarboxylic perfluoropolyethers of formula: A-O—(RF)z—(CFY)t—C(O)OX (I) wherein: X is H, C1-C10alkyl, or an aryl group; Y=F, CF3; t=1, 2 or 3; A is a C1-C4perfluoroalkyl end group; z=0 or 1; RFis a perfluorooxyalkylene chain; having a number average molecular weight in the range 180-8,000; comprising the following steps: a) one or more distillations of perfluoropolyethers (PFPE) of formula T-O—(RF)z-T′ (II) wherein: z and RFare as above defined; T, T′, equal to or different from each other, are selected from acyl fluoride or carbonyl-containing functional end groups and non functional end groups to obtain one PFPE fraction of formula (II) wherein the difference between the minimum and the maximum molecular weight of the components is lower than or equal to 600; b) partial fluorination of the fraction obtained in a); c) esterification c1) and/or hydrolysis c2) of the mixture obtained in b); d) distillation of the product obtained in c2) or in c1).

REFERENCES:
patent: 2713593 (1955-07-01), Brice et al.
patent: 3721696 (1973-03-01), Sianesi et al.
patent: 4755330 (1988-07-01), Viola et al.
patent: 6923921 (2005-08-01), Flynn et al.
patent: 2004/0147780 (2004-07-01), Fontana et al.

Affiliated with

Also associated with

Rating

Process for preparing high purity monocarboxylic... 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 high purity monocarboxylic..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparing high purity monocarboxylic... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2742559