Process for preparing fluoropolymer dispersions

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...

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

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

Rate now

     

Profile ID: LFUS-PAI-O-3612185

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.