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US 7,045,571 B2Granted
Emulsion polymerization of fluorinated monomers
Assignee3M Innovative Properties Company
InventorsLian S. Tan, Richard S. Buckanin
Life of this patent
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Abstract
The use of perfluorinated polymers and/or fluorinated ionomers as surfactant emulsifiers in emulsion polymerization of fluorinated monomers.
Claims4
A method comprising adding at least 1000 ppm a fluorinated surfactant being substantially free of micro-emulsion and having a molecular weight of at least 1000 g/mol and having the formula:
- MOOC-Q1-O—(CF2O)k(CF2CF2O)p(CF(CF3)CF2O)q-Q2-COOZ
- wherein k, p, and q each represent a value of 0 to 15, M and Z each represent hydrogen or a cation, and Q1 and Q2 each independently represent —CF2— or —CF(CF3)—, to an emulsion polymerization process, wherein the emulsion polymerization process is substantially free of perfluoroalkyl carboxylic acids.
Dependencies are inferred from the claim text.