Polyethylene resin composition for rotational molding and rotational molded product using the composition

摘要

PROBLEM TO BE SOLVED: To provide a rotational molding polyethylene resin composition which excels in rotational moldability and can prepare rotational molding products having impact resistance and environmental stress cracking resistance superior to those of the conventional polyethylene rotational molding products, and the rotational molding product using the composition. SOLUTION: This rotation molding polyethylene resin composition comprises (A) an ethylene/α-olefin copolymer which has a density of 0.880-0.930 g/cm3 and an MFR of 0.01-5 g/10 min and (B) an ethylene homopolymer or an ethylene/α-olefin copolymer which has a density of 0.931-0.974 g/cm3 and an MFR of 0.5-20 g/10 min, and the weight ratio [(A)/(B)] of the both components is 10/90 to 50/50 and, simultaneously, the density of a blend composed of the both components is 0.920-0.960 g/cm3, and the MFR of the blend is 1-10 g/10 min. It is preferred that component (A) is a copolymer prepared by using a metallocene type olefin polymerization catalyst and component (B) is a (co)polymer prepared by using a metallocene type or Ziegler type olefin polymerization catalyst. Rotational molding products are composed of the polyethylene composition.