초록

Perfluoroelastomer compositions having high loadings of large-particle size carbon black exhibit superior performance at very high temperature.

대표청구항 ▼

A composition comprising a) a perfluoroelastomer having copolymerized units of i) a perfluoroolefin, ii) a perfluoro(alkyl vinyl)ether of the formula CF2〓CFO(Rf′O)n(Rf″O)mRf where Rf′and Rf″are different linear or branched perfluoroalkylene groups of 2-6 carbon atoms, m and n are independently 0-10,

A composition comprising a) a perfluoroelastomer having copolymerized units of i) a perfluoroolefin, ii) a perfluoro(alkyl vinyl)ether of the formula CF2〓CFO(Rf′O)n(Rf″O)mRf where Rf′and Rf″are different linear or branched perfluoroalkylene groups of 2-6 carbon atoms, m and n are independently 0-10, and Rf is a perfluoroalkyl group of 1-6 carbon atoms, and iii) a cure site monomer which is either free of hydrogen atoms or which has hydrogen atoms that are removed during crosslinking of the perfluoroelastomer; and b) 35-70 parts per hundred parts perfluoroelastomer of a carbon black having an average particle size of at least about 100 nm as determined by ASTM D-3849; with the proviso that the cure site monomer of the perfluoroelastomer of component a) is present in an amount no greater than 3 mol % of the perfluoroelastomer. A composition comprising a) a perfluoroelastomer having copolymerized units of i) a perfluoroelefin; ii) a perfluoro(alkyl vinyl)ether of the formula CF2〓CFO(Rf′O)n(Rf″O)mRf where Rf′and Rf″are different linear or branched perfluoroalkylene groups of 2-6 carbon atoms, m and n are independently 0-10, and Rf is a perfluoroalkyl group of 1-6 carbon atoms; and iii) a cure site monomer which is either free of hydrogen atoms or which has hydrogen atoms that are removed during crosslinking of the perfluoroelastomer wherein the cure site monomer has at least one cyano substituent; and b) 35-70 parts pert hundred parts perfluoroelastomer of a carbon black having an average particle size of at least about 100 nm as determined by ASTMD-3849; with the proviso that the cure site monomer of the perfluoroelastomer of component a) is present in an amount no greater than 3 mole of the perfluoroelastomer.