Ethylene copolymer, composition including the copolymer, and shaped article and film or sheet formed from the ethylene copolymer or the composition

摘要

Objects of the invention are to obtain ethylene copolymers which have excellent rubber elasticity even without being crosslinked and maintain sufficient shaping processability even when filled with significantly large amounts of additives, and to provide methods for producing with good productivity films or sheets having flexibility and high stretchability. The invention is directed to an ethylene copolymer (X) including structural units derived from a component [A], a component [B] and a component [C] which are ethylene [A], an α-olefin of 3 to 20 carbon atoms [B] and a polyene and/or a cyclic olefin [C]. In the ethylene copolymer, (1) the content of structural units derived from the ethylene [A] is in the range of 50 to 90 mol % in 100 mol % of all the structural units in the copolymer (X); (2) the content of structural units derived from at least one polyene and/or the cyclic olefin [C] is in the range of 1.0 to 5.0 mol % in 100 mol % of all the structural units in the copolymer (X); and (3) the intrinsic viscosity [η] of the ethylene copolymer (X) as measured at 135° C. in a decalin solution is in the range of 7.8 to 13.0 dl/g. The invention also concerns with a composition including the ethylene copolymer (X), and uses.

主权项

1. An ethylene copolymer (X) , which satisfies the following (i) and (ii), comprising structural units derived from a component [A], a component [B] and a component [C] which are ethylene [A], an α-olefin of 3 to 20 carbon atoms [B] and a polyene and/or a cyclic olefin [C],
(1) the content of structural units derived from the ethylene [A] being in the range of 50 to 90 mol% in 100 mol% of all the structural units in the copolymer (X); (2) the content of structural units derived from the polyene and/or the cyclic olefin [C]being in the range of 1.0 to 5.0 mol% in 100 mol% of all the structural units in the copolymer (X); (3) the intrinsic viscosity [η] of the ethylene copolymer (X) as measured at 135° C. in a decalin solution being in the range of 7.8 to 13.0 dl/g, (i) the value B obtained from a 13C-NMR spectrum based on the following equation is 0.9 to 1.0:
Value B=[POE]/(2·[PE]·[PO]) (in the equation, [PE] is the molar fraction of the content of the units derived from ethylene (a) in the random copolymer, [PO] is the molar fraction of the content of the units derived from the α-olefin (b) in the random copolymer, and [POE] is the proportion of the number of α-olefin ethylene chains relative to the number of all the dyad chains in the random copolymer); and (ii) the loss tangent value, tan δ, as determined by dynamic viscoelasticity measurement at −10° C. and 1 Hz is not more than 0.1.