US2004092684A1PendingUtilityA1

Peroxide curable fluoroelastomers

42
Priority: Jul 11, 2002Filed: Sep 25, 2003Published: May 13, 2004
Est. expiryJul 11, 2022(expired)· nominal 20-yr term from priority
Inventors:Donald F. Lyons
C08F 214/22C08F 214/18C08F 214/26
42
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Claims

Abstract

Peroxide curable fluoroelastomers having copolymerized units of vinylidene fluoride or tetrafluoroethylene major monomer, at least one other fluorinated major monomer, a cure site monomer having the general formula CH 2 ═CH—(CF 2 ) n I, where n is an integer between 2 and 8, and iodine bound at the terminal positions of polymer chains, process well and have excellent tensile properties.

Claims

exact text as granted — not AI-modified
What is claimed is:  
     
         1 . A fluoroelastomer comprising copolymerized units of 
 (A) a first fluoromonomer selected from the group consisting of vinylidene fluoride and tetrafluoroethylene;    (B) at least one second fluoromonomer, different from said first fluoromonomer;    (C) 0.05 to 4 weight percent, based on total weight of said fluoroelastomer, of a cure site monomer having the general formula CH 2 ═CH—(CF 2 ) n I, where n is an integer between 2 and 8; and    (D) 0.01 to 1 weight percent, based on total weight of said fluoroelastomer, of iodine bound at terminal positions of fluoroelastomer polymer chains.    
     
     
         2 . A fluoroelastomer of  claim 1  wherein said cure site monomer is 4-iodo-3,3,4,4-tetrafluorobutene-1.  
     
     
         3 . A fluoroelastomer of  claim 1  wherein said first fluoromonomer is vinylidene fluoride.  
     
     
         4 . A fluoroelastomer of  claim 1  wherein said first fluoromonomer is vinylidene fluoride and wherein said second fluoromonomer is selected from the group consisting of fluorine-containing olefins, fluorine-containing ethers, and mixtures thereof.  
     
     
         5 . A fluoroelastomer of  claim 4  wherein said second fluoromonomer is selected from the group consisting of hexafluoropropylene, tetrafluoroethylene, 1,2,3,3,3-pentafluoropropene, chlorotrifluoroethylene, vinyl fluoride and perfluoro(methyl vinyl ether).  
     
     
         6 . A fluoroelastomer of  claim 1  wherein said first fluoromonomer is tetrafluoroethylene.  
     
     
         7 . A fluoroelastomer of  claim 1  wherein said first fluoromonomer is tetrafluoroethylene and wherein said second fluoromonomer is selected from the group consisting of fluorine-containing olefins, fluorine-containing ethers, and mixtures thereof.  
     
     
         8 . A fluoroelastomer of  claim 7  wherein said second fluoromonomer is selected from the group consisting of hexafluoropropylene, vinylidene fluoride, 1,2,3,3,3-pentafluoropropene, chlorotrifluoroethylene, vinyl fluoride and perfluoro(methyl vinyl ether).  
     
     
         9 . A fluoroelastomer of  claim 1  comprising copolymerized units of 30 to 60 wt. % vinylidene fluoride, 15 to 30 wt. % tetrafluoroethylene, 25 to 45 wt. % hexafluoropropylene, 0.1 to 0.4 wt. % 4-iodo-3,3,4,4-terafluorobutene-1 and 0.05 to 0.40 wt. % I at chain ends.  
     
     
         10 . A fluoroelastomer of  claim 1  comprising copolymerized units of 20 to 65 wt. % vinylidene fluoride, 5 to 30 wt. % tetrafluoroethylene, 30 to 45 wt. % perfluoro(methyl vinyl ether), 0.1 to 0.4 wt. % 4-iodo-3,3,4,4-tetrafluorobutene-1 and 0.05 to 0.40 wt. % I at chain ends.  
     
     
         11 . A fluoroelastomer of  claim 1  comprising copolymerized units of 44 to 60 wt. % tetrafluoroethylene, 39 to 55 wt. % perfluoro(methyl vinyl ether), 0.1 to 0.4 wt. % 4-iodo-3,3,4,4-tetrafluorobutene-1 and 0.05 to 0.40 wt. % I at chain ends.  
     
     
         12 . A curable fluoroelastomer composition comprising: 
 (A) a fluoroelastomer comprising (i) a first fluoromonomer selected from the group consisting of vinylidene fluoride and tetrafluoroethylene; (ii) at least one second fluoromonomer, different from said first fluoromonomer; (iii) 0.05 to 4 weight percent, based on total weight of said fluoroelastomer, of a cure site monomer having the general formula CH 2 ═CH—(CF 2 ) n I, where n is an integer between 2 and 8; and (iv) 0.01 to 1 weight percent, based on total weight of said fluoroelastomer, of iodine bound at terminal positions of fluoroelastomer polymer chains;    (B) an organic peroxide; and    (C) a coagent.    
     
     
         13 . A curable fluoroelastomer composition of  claim 12  further comprising (D) an acid acceptor.  
     
     
         14 . A curable fluoroelastomer composition of  claim 13  wherein said acid acceptor is selected from the group consisting of a divalent metal oxide, a divalent metal hydroxide, an organic amine having a pKa greater than 10, and mixtures thereof.  
     
     
         15 . A curable fluoroelastomer composition of  claim 12  wherein said fluoroelastomer cure site monomer is 4-iodo-3,3,4,4-tetrafluorobutene-1.  
     
     
         16 . A curable fluoroelastomer composition of  claim 12  wherein said first fluoromonomer in said fluoroelastomer is vinylidene fluoride.  
     
     
         17 . A curable fluoroelastomer composition of  claim 12  wherein said first fluoromonomer in said fluoroelastomer is vinylidene fluoride and wherein said second fluoromonomer is selected from the group consisting of fluorine-containing olefins, fluorine-containing ethers, and mixtures thereof.  
     
     
         18 . A curable fluoroelastomer composition of  claim 17  wherein said second fluoromonomer is selected from the group consisting of hexafluoropropylene, tetrafluoroethylene, 1,2,3,3,3-pentafluoropropene, chlorotrifluoroethylene, vinyl fluoride and perfluoro(methyl vinyl ether).  
     
     
         19 . A curable fluoroelastomer composition of  claim 12  wherein said first fluoromonomer in said fluoroelastomer is tetrafluoroethylene.  
     
     
         20 . A curable fluoroelastomer composition of  claim 12  wherein said first fluoromonomer in said fluoroelastomer is tetrafluoroethylene and wherein said second fluoromonomer is selected from the group consisting of fluorine-containing olefins, fluorine-containing ethers, and mixtures thereof.  
     
     
         21 . A curable fluoroelastomer composition of  claim 20  wherein said second fluoromonomer is selected from the group consisting of hexafluoropropylene, vinylidene fluoride, 1,2,3,3,3-pentafluoropropene, chlorotrifluoroethylene, vinyl fluoride and perfluoro(methyl vinyl ether).  
     
     
         22 . A curable fluoroelastomer composition of  claim 12  wherein said fluoroelastomer comprises copolymerized units of 30 to 60 wt. % vinylidene fluoride, 15 to 30 wt. % tetrafluoroethylene, 25 to 45 wt. % hexafluoropropylene, 0.1 to 0.4 wt. % 4-iodo-3,3,4,4-terafluorobutene-1 and 0.05 to 0.40 wt. % I at chain ends.  
     
     
         23 . A curable fluoroelastomer composition of  claim 12  wherein said fluoroelastomer comprises copolymerized units of 20 to 65 wt. % vinylidene fluoride, 5 to 30 wt. % tetrafluoroethylene, 30 to 45 wt. % perfluoro(methyl vinyl ether), 0.1 to 0.4 wt. % 4-iodo-3,3,4,4-tetrafluorobutene-1 and 0.05 to 0.40 wt. % I at chain ends.  
     
     
         24 . A curable fluoroelastomer composition of  claim 12  wherein said fluoroelastomer comprises copolymerized units of 44 to 60 wt. % tetrafluoroethylene, 39 to 55 wt. % perfluoro(methyl vinyl ether), 0.1 to 0.4 wt. % 4-iodo-3,3,4,4-tetrafluorobutene-1 and 0.05 to 0.40 wt. % I at chain ends.

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