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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 equation k.gtoreq.0.2+0.0743.times.[.eta.]; (2) a molar ratio [CH.sub.3 /CH.sub.2 ] of a methyl group to a methylene group is in a region of 0.005 to 0.1 and meets the equation Tm.gtoreq.131-1340[CH.sub.3 /CH.sub.2 ]; (3) an Mw and a die swell ratio (DR) meet the equation DR>0.5+0.125.times.log Mw; or (4) in the measurement of a loss elastic modulus, a .beta.-relaxation peak is present in the range of 0 to -100.degree. 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.

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First Claim