C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
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.
Ackermann Jurgen
Kruger Ralf
Steinberger Helmut
Wrobel Dieter
Aktiengesellschaft Bayer
Fetherstonhaugh & Co.
Lanxess Deutschland Gmbh
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