Process for the preparation of curable fluoroelastomers and...

Details Process for the preparation of curable fluoroelastomers and... Process for the preparation of curable fluoroelastomers and...

C - Chemistry, Metallurgy

08

F

402/411

C08F 214/22 (2006.01) C08F 2/38 (2006.01)

Patent

CA 1281150

ABSTRACT OF THE DISCLOSURE Disclosed is a process for the preparation of new curable fluoroelastomers that are easily processable and have high mechanical properties and chemical thermal resistance characteristres in the cured state. This process comprises reacting from 35 to 80 mol % of vinylidene fluoride, from 15 to 35 mol % of hexafluoropropene, from 0 to 30 mol % of another comonomer selected from fluoroolefins and/or perfluorovinyl ethers and from 0.01 to 1 mol % of a brominated fluorovinyl ether of general formula: CF2BR-(Rf)n-O-CF=CF2 wherein Rf is a fluorinated alkylene radical containing from 1 to 9 carbon atoms and n is either 0 or 1, in the presence of a known polymerization initiator for fluoroelastomers, and of small amounts of a chain-transfer agent of general formula: R-(CF2Br)m wherein m is either 1 or 2; when m is 1, R is either bromine or a perfluoroalkyl radical of 2 to 4 carbon atoms containing a bromine atom bonded to a secondary carbon atom; and when m is 2, R is an alkylene radical of 2 to 4 carbon atoms containing a bromine atom bonded to a secondary carbon atom.

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