[특허]Aqueous emulsion polymerization in the presence of ethers as chain transfer agents to produce fluoropolymers

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C08F-114/18
출원번호	US-0136912 (2002-04-30)
발명자 / 주소	Kaspar, Harald Hintzer, Klaus Weilandt, Karl-Dieter Krichel, Jost Peters, Erik Chen, Lisa P.
출원인 / 주소	3M Innovative Properties Company
대리인 / 주소	Lilly, James V.
인용정보	피인용 횟수 : 26 인용 특허 : 28

초록 ▼

The present invention provides a method of making a fluoropolymer comprising repeating units derived from one or more gaseous fluorinated monomers. The method comprises an aqueous emulsion polymerization of gaseous fluorinated monomers in the presence of an ether selected from the group consisting o

The present invention provides a method of making a fluoropolymer comprising repeating units derived from one or more gaseous fluorinated monomers. The method comprises an aqueous emulsion polymerization of gaseous fluorinated monomers in the presence of an ether selected from the group consisting of dimethyl ether (DME), methyl tertiary butyl ether (MTBE) and mixtures thereof.

대표청구항 ▼

1. Method of making a fluoropolymer comprising repeating units derived from one or more gaseous fluorinated monomers, said method comprising an aqueous emulsion polymerization of said gaseous fluorinated monomers in the presence of an ether selected from the group consisting of dimethyl ether (DME),

1. Method of making a fluoropolymer comprising repeating units derived from one or more gaseous fluorinated monomers, said method comprising an aqueous emulsion polymerization of said gaseous fluorinated monomers in the presence of an ether selected from the group consisting of dimethyl ether (DME), methyl tertiary butyl ether (MTBE) and mixtures thereof. 2. Method according to claim 1 wherein said fluoropolymer has a partially fluorinated backbone.3. Method according to claim 1 wherein said aqueous emulsion polymerization involves a copolymerization of a gaseous fluorinated monomer selected from the group consisting of tetrafluoroethylene, chlorotrifluoroethylene and vinylidene fluoride and a comonomer selected from the group consisting of vinylidene fluoride, perfluoroalkyl vinyl monomers, fluorinated allyl ethers, fluorinated vinyl ethers, ethylene and propylene.4. Method according to claim 3 wherein said fluorinated vinyl ether is a perfluorovinyl ether of the formula:CF 2═CF—O—Rfwherein R frepresents a perfluorinated aliphatic group that may contain one or more oxygen atoms.5. Method according to claim 1 wherein said aqueous emulsion polymerization is carried out in the presence of a fluorinated surfactant.6. Method according to claim 3 wherein said surfactant is non-telogenic.7. Method according to claim 1 wherein said fluoropolymer is a semi-crystalline fluoropolymer or an amorphous fluoropolymer.8. Method according to claim 1 wherein the fluoropolymer produced is a copolymer selected from the group consisting of a copolymer of chlorotrifluoroethylene and vinylidene fluoride, a copolymer of tetrafluoroethylene and vinylidene fluoride, a copolymer of vinylidene fluoride and hexafluoropropylene, a copolymer of tetrafluoroethylene and ethylene, a copolymer of tetrafluoroethylene and propylene, a copolymer of vinylidene fluoride and a perfluorovinyl ether.9. Method according to claim 1 wherein said fluoropolymer produced is a copolymer of tetrafluoroethylene, vinylidene fluoride and hexafluoropropylene, a copolymer of vinylidene fluoride, tetrafluoroethylene and a perfluorovinyl ether, a copolymer of tetrafluoroethylene, ethylene and hexafluoropropylene, a copolymer of tetrafluoroethylene, ethylene or propylene and a perfluorovinyl ether.10. Method according to claim 1 wherein said fluoropolymer produced is a copolymer of tetrafluoroethylene, ethylene or propylene, hexafluoropropylene and a perfluorovinyl ether.11. Method according to claim 1 wherein said fluoropolymer is a curable fluoroelastomer comprising one or more cure site components.12. Method according to claim 1 wherein said fluoropolymer is a fluorothermoplast having a melting point between 60° C. and 300° C.13. Method according to claim 1 wherein said aqueous emulsion polymerization is carried out without adding a surfactant to the polymerization system.14. Method according to claim 13 wherein said polymerization is carried out in the presence of a free radical initiator system comprising a reducing agent and an oxidizing agent, said free radical initiator system being added to the aqueous phase to initiate the aqueous emulsion polymerization and further reducing agent or oxidizing agent being added to the aqueous phase during the aqueous emulsion polymerization.15. Method according to claim 1 wherein the polymerization is conducted in such a way so as to produce a multi-modal molecular weight distribution.16. Method according to claim 15 wherein said polymerization is a single step polymerization.17. Method according to claim 15 wherein said multi-modal molecular weight distribution is obtained by adding no or an initial charge of said ether at the beginning of the polymerization and one or more further charges during the polymerization.18. Method according to claim 1 wherein a core shell polymer is produced.19. Method according to claim 18 wherein the core is amorphous and the shell is semi-crystalline.20. Method of making a fluoropolymer co mprising repeating units derived from one or more gaseous fluorinated monomers, said method comprising an aqueous emulsion polymerization of said gaseous fluorinated monomers in the presence of an ether selected from the group consisting of dimethyl ether (DME), methyl tertiary butyl ether (MTBE) and mixtures thereof, wherein said fluoropolymer has a partially fluorinated backbone.

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[미국특허] Aqueous emulsion polymerization in the presence of ethers as chain transfer agents to produce fluoropolymers 원문보기

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[미국특허] Aqueous emulsion polymerization in the presence of ethers as chain transfer agents to produce fluoropolymers 원문보기

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