US 6,982,173 B2 | ||
PFPEs having at least an alkylether end group and respective preparation process | ||
Giuseppe Marchionni, Milan (Italy); and Mario Visca, Alessandria (Italy) | ||
Assigned to Solvay Solexis, S.p.A., Milan (Italy) | ||
Filed on Jun. 26, 2002, as Appl. No. 10/179,977. | ||
Claims priority of application No. MI2001A1340 (IT), filed on Jun. 26, 2001. | ||
Prior Publication US 2003/0013923 A1, Jan. 16, 2003 | ||
Int. Cl. G01N 33/00 (2006.01) |
U.S. Cl. 436—135 | 4 Claims |
1. A method for the analytical determination of peroxidic perfluoropolyether oxidizing power (PO) in peroxidic perfluoropolyethers
(PFPE), comprising titrating iodine generated by oxidation of an iodide from the peroxide contained in the PFPE, in the presence
of a solvent having structural formula:
R1O—(CF2O)n—(CF2CF2O))mR2 (I)
wherein:
R1 is —CH3 or —C2H5;
R2 is equal to R1 or —CF2H;
n is 0 or an integer from 1 to 100;
m is an integer from 1 to 100 or, when R2 is CF2H, m can also be 0; and
the oxyfluoroalkylene units —(CF2CF2O)— and —(CF2O)— are statistically
distributed along the polymer chain in substitution of 1,1,2-trichloro trifluoro ethane.
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