Fluororubber, a process for its production and its use, as...

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 214/22 (2006.01) C08F 14/22 (2006.01) C08L 27/16 (2006.01) C09D 127/16 (2006.01)

Patent

CA 2206632

The present invention relates to a new fluororubber, a process for its production and its use, as well as a process for producing fluororubber mouldings and/or coatings. The fluororubber comprises a) vinylidene fluoride and optionally further fluorine-containing and/or non-fluorine-containing monomers and b) at least one compound from the group consisting of diiodomethane, 1,2-diiodo-1,1-difluoroethane, 1-iodo-2-bromo-1,1-difluoroethane, 1-bromo-2-iodo-1,1- difluoro-ethane and/or 1,2-dibromo-1,1-difluoroethane, in which at least 800 of the terminal groups have the formula -CH2-X where X = Br and/or I, which contains amounts of iodine and/or bromine of 1 to 5 wt.%, preferably 1 to 4 wt.%, more preferably 2 to 3 wt.%, and which has a complex viscosity at 100°C and .omega. = 6.3 s-1 of 0.01-30 kPa.s as well as a temperature index, calculated as quotient of the viscosities at 40°C and 100°C, of 3-250. The fluororubber is prepared by radical polymerization. The liquid fluororubber is pumpable at slightly elevated temperatures (60-120°C) and can be processed in conventional thermoplastics processing machinery. In addition the liquid fluororubber is stable on storage and readily cross- linkable, and the resulting rubber parts exhibit good mechanical as well as ageing properties that are very close to those of conventional solid fluororubbers.

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