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Fluoroelastomer, production thereof, crosslinkable composition and curing product

Inactive Publication Date: 2001-07-19
NIPPON MEKTRON LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0082] Curing product having excellent resistances to heat, cold and solvents can be obtained by the use of the fluoroelastomer and crosslinkable composition thereof according to the present invention.

Problems solved by technology

However, the product of peroxide crosslinking obtained from this composition, although exhibiting cold resistance to a certain extent, has a drawback in that the solvent resistance is poor.
However, because the iodated compound used as a chain transfer agent has a small molecular weight, there is a problem that an improvement of cold resistance cannot be expected at all.

Method used

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  • Fluoroelastomer, production thereof, crosslinkable composition and curing product

Examples

Experimental program
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Effect test

example 1

[0084] A 500 ml autoclave was charged with:

[0085] 44 g (69.3 mol %) of vinylidene fluoride (VdF),

[0086] 6 g (6.1 mol %) of tetrafluoroethylene (TFE),

[0087] 24 g (14.6 mol %) of perfluoro(methyl vinyl ether)

[0088] (FMVE) and 32 g (10.0 mol %) of perfluoro(methoxypropyl vinyl ether) (MPVE),

[0089] 5 g of ammonium perfluorooctanoate,

[0090] 0.54 g of Na.sub.2HPO.sub.4.multidot.12H.sub.2O,

[0091] 0.02 g of NaHSO.sub.3,

[0092] 200 ml of water, and

[0093] 1.0 g of CF.sub.2.dbd.CFOCF.sub.2CF.sub.2Br.

[0094] The mixture was heated to 50.degree. C., and 0.1 g of ammonium persulfate was added thereto to thereby initiate a polymerization. The reaction was performed for 8 hr, and the mixture was cooled to about 30.degree. C. Unreacted gas was released, and the polymerization was terminated.

[0095] The obtained product was subjected to salting out with the use of a 2% aqueous solution of calcium chloride, and dried. Thus, there was obtained 100.6 g (polymerization ratio: 94.0%) of white fluoroelastomer...

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Abstract

A fluoroelastomer comprising constituent units derived from vinylidene fluoride (a) and constituent units derived from perfluoro(methoxypropyl vinyl ether) (b), optionally together with constituent units derived from tetrafluoroethylene (c) and / or constituent units derived from a perfluoroalkyl vinyl ether (d), wherein the constituent units (a) are contained in an amount of 65 to 85 mol %, the constituent units (b) in an amount of 0.5 to 30 mol %, the constituent units (c) in an amount of 0 to 10 mol % and the constituent units (d) in an amount of 0 to 25 mol %. The fluoroelastomer can be produced by a process comprising copolymerizing vinylidene fluoride and perfluoro(methoxypropyl vinyl ether), optionally together with tetrafluoroethylene and / or a perfluoroalkyl vinyl ether, in the presence of an iodated brominated compound represented by the general formula RBrnIm [I]. Further, there is provided a crosslinkable composition comprising the above fluoroelastomer and a peroxide crosslinking agent. Still further, there is provided a curing product produced by curing the above crosslinkable composition, and having excellent resistances to heat, cold and solvents.

Description

[0001] The present invention relates to a fluoroelastomer, a process for producing the fluoroelastomer, a crosslinkable composition containing the fluoroelastomer and a curing product from the crosslinkable composition.[0002] Properties such as resistances to heat, cold and solvents (including fuel oil and other oils) are required for molded items such as oil seals and fuel hoses for automobiles, aircrafts, etc. Thus, there is a demand for the development of resin materials which possess these properties in desirable balance.[0003] For example, Japanese Patent Publication No. 54(1979)-1585 describes a fluorinated polymer composition comprising an organic peroxide and a fluorinated polymer obtained by copolymerization with an olefin containing 3 mol % or less of bromine. However, the product of peroxide crosslinking obtained from this composition, although exhibiting cold resistance to a certain extent, has a drawback in that the solvent resistance is poor.[0004] On the other hand, J...

Claims

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Application Information

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IPC IPC(8): C08J3/24C08F2/38C08F214/22C08K5/14C08L27/16
CPCC08K5/14C08L27/16
Inventor ABE, KATSUMITATSU, HARUYOSHI
Owner NIPPON MEKTRON LTD
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