C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 14/18 (2006.01) C08L 27/12 (2006.01)
Patent
CA 2609834
The present invention relates to a method for making a fluoropolymer comprising an aqueous emulsion polymerization of one or more fluorinated monomers wherein said aqueous emulsion polymerization is carried out in the presence of an oligomer that comprises one or more ionic groups, has a partially fluorinated backbone, a number average molecular weight of not more than 2000 g/mol and that has a combination of repeating units different from that of the fluoropolymer that is being produced by the polymerization of said one or more fluorinated monomers. Since the polymerization of the one or more fluorinated monomers to produce the desired fluoropolymer is carried out in the presence of the oligomer, the resulting dispersion will contain the oligomer in addition to the fluoropolymer. Thus, in a further aspect, the invention relates to an aqueous dispersion of a fluoropolymer comprising the oligomer.
Procédé d'élaboration de fluoropolymère par polymérisation sous émulsion aqueuse d'un ou plusieurs monomères fluorés, en présence d'oligomère qui comprend un ou plusieurs groupes ioniques, avec ossature partiellement fluorée, masse moléculaire moyenne en nombre ne dépassant pas 2 000 g/mol et combinaison d'unités de répétition différente de celle d'un fluoropolymère issu de la polymérisation d'un ou plusieurs monomères fluorés. Sachant que l'opération est conduite en présence de l'oligomère, la dispersion résultante contiendra l'oligomère en plus du fluoropolymère. Ainsi, selon un autre aspect, l'invention concerne une dispersion aqueuse de fluoropolymère renfermant l'oligomère.
Hintzer Klaus
Juergens Michael
Kaspar Harald
Lochhaas Kai Helmut
Maurer Andreas R.
3m Innovative Properties Company
Smart & Biggar
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