Process for producing fluoropolymers

Details Process for producing fluoropolymers Process for producing fluoropolymers

2011-08-02

2011-08-02

Eashoo, Mark (Department: 1767)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S242000, C526S247000, C526S249000, C526S250000, C526S253000, C526S254000, C526S255000, C526S348800, C562S008000, C562S025000

Reexamination Certificate

active

07989566

ABSTRACT:
An emulsion polymerization process for the production of non-elastomeric fluoropolymers is disclosed wherein at least one fluorosurfactant is employed as dispersant, said fluorosurfactant being a fluoroalkylphosphoric acid ester of the formula X-Rf-(CH2)n—O—P(O)(OM)2, wherein n is 1 or 2, X═H or F, M=a univalent cation, and Rf is a C4-C6fluoroalkyl or fluoroalkoxy group. Optionally, a second dispersing agent may be employed in the polymerization, said second agent being a perfluoropolyether having at least one endgroup selected from the group consisting of carboxylic acid, a salt thereof, sulfonic acid and a salt thereof, phosphoric acid and a salt thereof.

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patent: 2004-358397 (2004-12-01), None

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