| abstract |
Polyethylenes are disclosed herein which are derived from an ethylene monomer and in which any quaternary carbon atom is not present in a polymeric main chain; and the activation energy (Ea) of melt flow is in the range of 8 to 20 kcal/mol; as well as (1) a Huggins coefficient (k) and an intrinsic viscosity [ eta ] meet the relation of the equationk>/=0.2+0.0743x[ eta ];(2) a molar ratio [CH3/CH2] of a methyl group to a methylene group is in a region of 0.005 to 0.1 and meets the equationTm>/=131-1340[CH3/CH2];(3) an Mw and a die swell ratio (DR) meet the equationDR>0.5+0.125xlog Mw; or(4) in the measurement of a loss elastic modulus, a beta -relaxation peak is present in the range of 0 to -100 DEG C. These polyethylenes are different from a usual HDPE, L-LDPE and LDPE, and they are excellent in working properties and permit the control of physical properties such as density, a melting point and crystallinity mainly in the state of a homopolymer. |