Process for preparing fluoropolymer dispersions

Details Process for preparing fluoropolymer dispersions Process for preparing fluoropolymer dispersions

2006-09-05

2006-09-05

Wu, David W. (Department: 1713)

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

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

C524S544000, C524S458000, C526S242000, C526S248000

Reexamination Certificate

active

07101925

ABSTRACT:
A process to substantially remove the fluorinated anionic surfactants comprising the following steps:a) addition to a fluoropolymer dispersion of a nonionic surfactant, in an amount in the range 1.5%–25% by weight, referred to the fluoropolymer weight;b) addition to the dispersion of a salt, soluble in water and not giving precipitates in the dispersion under the use conditions;c) contact of the dispersion with a basic anionic exchanger;d) separation of the dispersion from the basic anionic exchanger;before step d) the dispersion being filterable on a 180 micrometer net and successively on a 10 micrometer net.

REFERENCES:
patent: 2559752 (1951-07-01), Berry et al.
patent: 3037953 (1962-06-01), Marks et al.
patent: 3271341 (1966-09-01), Garrison, Jr. et al.
patent: 3301807 (1967-01-01), Hoashi et al.
patent: 3536643 (1970-10-01), Stryker et al.
patent: 3704272 (1972-11-01), Holmes et al.
patent: 4369266 (1983-01-01), Kuhls et al.
patent: 4380618 (1983-04-01), Khan et al.
patent: 4864006 (1989-09-01), Giannetti et al.
patent: 4990283 (1991-02-01), Visca et al.
patent: 5789508 (1998-08-01), Baker et al.
patent: 6136893 (2000-10-01), Yamashita et al.
patent: 6297334 (2001-10-01), Marchese et al.
patent: 6479591 (2002-11-01), Kapeliouchko et al.
patent: 6518352 (2003-02-01), Visca et al.
patent: 6576703 (2003-06-01), Kapeliouchko et al.
patent: 6825250 (2004-11-01), Epsch et al.
patent: 6833403 (2004-12-01), Bladel et al.
patent: 6861466 (2005-03-01), Dadalas et al.
patent: 2003/0153674 (2003-08-01), Visca et al.
patent: 2003/0220442 (2003-11-01), Epsch et al.
patent: 100 18 853 (2001-10-01), None
patent: 0 194 690 (1986-09-01), None
patent: 1 155 055 (2003-04-01), None
patent: 1 526 142 (2005-04-01), None
patent: 1 538 177 (2005-06-01), None
patent: 03/051988 (2003-06-01), None
“Nonionic Surfactants”; Martin J. Schick et al;Marcel Dekker Inc.; 1967; pp. 76-85, pp. 102-125, 138-141, and pp. 570-583.
“Encyclopedia of Chemical Technology”; Kirk Othmer;J. Wiley&Sons; 1995; vol. 14; pp. 737-783.
“Encyclopedia of Industrial Chemical Analysis”;Interscience Publishers; New York; NY; 1971; vol. 1: pp. 339-340 Not Available.
European Search Report

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