Patent ID: 9068653
Filing Date: 2015-06-30
Classification: C08K,C08L,C09K,F16J

Abstract:
1. A packer seal comprising a cross-linked fluororubber layer obtainable by cross-link-molding a fluororubber composition containing a fluororubber (A) and a carbon black (B), the cross-linked fluororubber layer having a loss modulus E″ of 600 to 6,000 kPa determined by a dynamic viscoelasticity test under conditions of measurement temperature: 160° C., tensile strain: 1%, initial force: 157 cN, and frequency: 10 Hz, wherein the fluororubber (A) is at least one copolymer selected from the group consisting of a vinylidene fluoride (VdF)/hexafluoropropylene (HFP) copolymer, copolymer of VdF/fluorine-containing monomer (2) of formula (2): CH wherein R the VdF/HFP copolymer consists of a VdF repeating unit and a HFP repeating unit, and the VdF/PAVE copolymer consists of a VdF repeating unit and a PAVE repeating unit and the carbon black (B) comprises at least one carbon black selected from the group consisting of SAF-HS, SAF, N234, ISAF, ISAF-LS, ISAF-HS, N339, HAF-LS, HAF-HS, HAF, N351 and LI-HAF.