| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyethylene made capable of long storage even with contents causing a problem of oxidation deterioration and reduction of airtightness as excellent in moldability, molded article appearance, strength, rigidity, ESCR, food safety and recyclability, also excellent in gas barrier property which is a defect of conventional polyolefin resin caps.SOLUTION: A cap is made from a resin composition by blending 95 to 60 wt.% of high density polyethylene having specific physical property with 5 to 40 wt.% of an ethylene polymer having density of 920 to 960 kg/m, MFR of 0.1 to 15 g/10 min., exhibiting two peaks in a molecular weight measurement by a gel permeation chromatography, having a ratio of weight average molecular weight (Mw) and number average molecular weight (Mn) (Mw/Mn) in a range of 2.0 to 7.0 and a long chain branch of 0.15 or more per 1000 carbon number of a main chain in a fraction with Mn of 100,000 or more when molecular weight separation.SELECTED DRAWING: None |
