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US 2010/0160550 A1Published application
Use of ethylene-tetrafluoroethylene carboxylic acids and salts as surfactants for aqueous emulsion polymerization of fluorinated monomer
AssigneeE.I. du Pont de Nemours and Company
InventorWeiming Qiu
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Abstract
Provided are polyfluorinated carboxylic acids and their salts containing an ethylene-tetrafluoroethylene moiety. The polyfluorinated carboxylic acids and salts are useful as surfactants in polymerization processes.
Claims13
A process comprising the step of polymerizing at least one fluorinated monomer in an aqueous medium containing initiator and fluorosurfactant, said fluorosurfactant comprising a compound of Formula (I)
- Rf(CH2CH2CF2CF2)x(CH2CH2CF2)yC(O)OM (I)
- wherein Rf is a linear or branched perfluoroalkyl group with 1 to 4 carbon atoms, x is 1 to 3, and y is 0 or 1;
- and M is H, NH4, Li, Na, or K;
- with the proviso that the sum of x and y is 2 or greater.
1 more element
Dependencies are inferred from the claim text.