Linear perfluoropolyethers having an improved...

Details Linear perfluoropolyethers having an improved... Linear perfluoropolyethers having an improved...

2011-03-22

2011-03-22

Mulcahy, Peter D. (Department: 1764)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C428S421000, C508S250000, C525S387000

Reexamination Certificate

active

07910671

ABSTRACT:
Linear perfluoropolyethers of formula:in-line-formulae description="In-line Formulae" end="lead"?T-O(CF2O)n(CF2CF2O)m(CF2CF2CF2O)r(CF2CF2CF2CF2O)s-T1  (I)in-line-formulae description="In-line Formulae" end="tail"?wherein n, m, r, s are integers such that the polymer number average molecular weight is comprised between 700 and 100,000 and the n/(n+m+r+s) ratio ranges from 0.05 to 0.40, and respective preparation process by addition of a peroxidic perfluoropolyether of formula (III):in-line-formulae description="In-line Formulae" end="lead"?T4-O(CF2O)n′(CF2CF2O)m′(O)h-T5  (III)in-line-formulae description="In-line Formulae" end="tail"?having a PO from 1.8 to 4, to a perfluoropolyether oil preheated at a temperature comprised between 150° C. and 250° C. and subsequent exhaustive fluorination of the obtained compound.

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