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Abstract

The present invention is to provide a polyethylene resin composition for container closures and a container closure exhibiting excellent mouldability, high flowability, excellent balance between rigidity and impact resistance, excellent stress cracking resistance, excellent sliding property, low odour level, harmlessness for food, decreased elongation at high temperatures and sterilizability by electron beam upon attachment of the closure to a container. The present invention is a polyethylene resin composition for a container closure, this composition having, relative to 100 parts by weight of a polyethylene resin, 0.01 to 0.50 parts by weight of a hindered amine compound and having the following properties (a) to (f):

(a) a melt flow rate (MFR) of 0.5 to 10 g/10 min, a melt flow rate (HLMFR) of 100 to 500 g/10 min and HLMFR/MFR of 50 to 200;(b) a density of 0.956 to 0.980 g/cm3;(c) a flexural modulus of an injection moulding test specimen of 990 to 2000 MPa;(d) a constant strain ESCR of an injection moulding test specimen of 10 to 400 hours;(e) a tensile elongation at break of 190% or less; and(f) a melt viscosity of 470 Pa·s or less.

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