| Title of Invention | A PROCESS FOR MAKING A FLUOROPOLYMER HAVING NITRILE END GROUPS |
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| Abstract | The present invention relates to a process for making a fluoropolymer having nitrile endgroups,. said process comprising a free radical polymerizing one or more fluorina~ed monomers in the presence of a nitrile group containing salt or a nitrile group containing pseudohalogen compound. |
| Full Text | CLAIMS 1. Process for making a fluoropoiymer having nitrile endgroups, said process comprising a free radical polymerizing one or more fluorinated monomers in the presence of a nitrile group containing salt or a nitrile group containing pseudohalogen compound. 2. Process according to claim 1 wherein polyxnerizingis an aqueous emulsion polymerization and said nitrile group containing salt is a water soluble salt. 3. Process according to claim 2 wherein said nitrile group containing salt corresponds to the formula: M-(Xrt-CN)n wherein M represents a mono- or multi-valent cation, X is O, S, Se or N, a is 0 or 1 and n corresponds to the valence of the cation. 4. Process according to claim 3 wherein said nitrile group containing salt is selected from an ammonium salt, alkali metal salt, alkaline earth metal salt and tetraalkylammonium salt of cyanate, thiocyanate, or cyanide. 5. Process according to claim 1 wherein said fluorinated monomers comprise one or more fluorinated olefins and optionally one or more fluorinated vinyl ethers. 6- Process according to claim 1 wherein said fluorinated monomers comprise one or more fluorinated olefins and at least one fluorinated monomer comprising a nitrile group. 7. Process according to claim 1 wherein said polymerization further involves one or more non-fluorinated comonomers. 8. Process according to claim 1 wherein said fluoropoiymer is a substantially amorphous fluoropoiymer. 9. Method of making a fluoroelastomer composition comprising (i) carrying out the process as defined in any of claims 1 to 8 and (ii) combining a thus obtained fluoropoiymer with a cure composition. 10. Method of making a fluoroelastomer comprising (i) carrying out: the process as defined in any of claims 1 to 8, (ii) combining a thus obtained fluoropoiymer with a cure composition and (iii) curing die thus obtained fluoroelastomer composition. 11. A nitrile group containing fluoroelastomer which is in the form of a solid, has nitrile groups at both ends and is represented by the formula NCX-(Rf)-XCN where X = O or S and Rf is a divalent fluoroelastomer chain. |
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0940-chenp-2005 abstract-duplicate.pdf
0940-chenp-2005 claims-duplicate.pdf
0940-chenp-2005 description (complete)-duplicate.pdf
940-chenp-2005-assignement.pdf
940-chenp-2005-correspondnece-others.pdf
940-chenp-2005-correspondnece-po.pdf
940-chenp-2005-description(complete).pdf
| Patent Number | 220417 | |||||||||||||||
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| Indian Patent Application Number | 940/CHENP/2005 | |||||||||||||||
| PG Journal Number | 30/2008 | |||||||||||||||
| Publication Date | 25-Jul-2008 | |||||||||||||||
| Grant Date | 28-May-2008 | |||||||||||||||
| Date of Filing | 16-May-2005 | |||||||||||||||
| Name of Patentee | 3M INNOVATIVE PROPERTIES COMPANY | |||||||||||||||
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Inventors:
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| PCT International Classification Number | C08F8/00 | |||||||||||||||
| PCT International Application Number | PCT/US03/36576 | |||||||||||||||
| PCT International Filing date | 2003-11-14 | |||||||||||||||
PCT Conventions:
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