ETHYLENE-a-OLEFIN COPOLYMER AND OLEFIN RESIN COMPOSITION

摘要

[Problem] To provide an ethylene-α-olefin copolymer that is highly effective in improving the molding properties of polyolefin resins, improving the balance between impact strength and stiffness, and improving transparency. [Solution] Provided is an ethylene-α-olefin copolymer having a specific MFR, a specific density, and a specific molecular weight distribution, containing a suitable amount of a long-chain branching structure characterized by a branching index, and having a specific composition distribution structure characterized by solvent fractionation behavior.

主权项

1. An ethylene-α-olefin copolymer satisfying the following conditions (1), (2), (5), and (7):
(1) the copolymer has a MFR of 0.001 to 0.1 g/10 minutes; (2) the copolymer has a density of not less than 0.895 g/cm3 but less than 0.918 g/cm3; (5) the copolymer has a minimum branching index (gc) of 0.40 to 0.85 as measured for branching index g′ in the molecular weight range of 100,000 to 1,000,000 with a GPC measurement system comprising a combination of a differential refractometer, a viscosity detector, and a light scattering detector; and (7) the copolymer has a sum (W2+W3) of a content (W2) and a content (W3) of more than 40% by weight but less than 80% by weight, wherein W2 is a content of components with molecular weights equal to or more than a weight average molecular weight in components eluted at temperatures equal to or lower than a temperature where an eluted amount determined from an integral elution curve measured by cross fractionation chromatography (CFC) is 50 wt %, and W3 is a content of components with molecular weights less than the weight average molecular weight in components eluted at temperatures higher than the temperature where the eluted amount determined from the integral elution curve is 50 wt %.