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US 2006/0135716 A1Published application
Fluoroelastomers having low glass transition temperature
OwnerMing-Hong Hung, Phan Tanginventors
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Abstract
Fluoroelastomers are disclosed which have a glass transition temperature less than −10° C. The elastomers contain copolymerized units of a perfluorovinylpolyether that is derived from a trimer or tetramer of hexafluoropropylene oxide.
Claims15
A process for preparation of a fluoroelastomer comprising:
- A) emulsifying a mixture comprising i) a perfluorovinylpolyether selected from the group consisting of a) hexafluoropropylene oxide trimer olefin, b) hexafluoropropylene oxide tetramer olefin, and c) mixtures thereof;
- ii) surfactant and iii) water to form an emulsified perfluorovinylpolyether;
- and
- B) copolymerizing said emulsified perfluorovinylpolyether with at least one gaseous fluoromonomer selected from the group consisting of vinylidene fluoride and tetrafluoroethylene to form a fluoroelastomer having a glass transition temperature of less than −10° C. as determined by differential scanning calorimetry in heating mode with a heating rate of 10° C. per minute, inflection point of transition.
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A fluoroelastomer comprising copolymerized units of A) 30 to 76 mole percent vinylidene fluoride;
- B) 10 to 60 mole percent units of a perfluorovinylpolyether selected from the group consisting of i) hexafluoropropylene oxide trimer olefin, ii) hexafluoropropylene oxide tetramer olefin, and iii) mixtures thereof;
- and
- C) 5 to 50 mole percent units of at least one fluorine-containing monomer different from A) and B).
A fluoroelastomer comprising copolymerized units of
- A) 20 to 85 mole percent tetrafluoroethylene;
- B) 5 to 45 mole percent units of at least one monomer selected from the group consisting of a perfluoro(alkyl vinyl ether), a fluorinated vinyl ether, propylene and ethylene;
- and
- C) 10 to 60 mole percent of a perfluorovinylpolyether selected from the group consisting of i) hexafluoropropylene oxide trimer olefin, ii) hexafluoropropylene oxide tetramer olefin, and iii) mixtures thereof.
1 more element
Dependencies are inferred from the claim text.