Polyethylene resin composition and containers using the same

摘要

A polyethylene resin composition which permits the bleeding additive contained therein to be bled at an increased rate even if it has a large molecular weight and, therefore, permits the bleeding agent to be bled to the surface of the resin in an amount sufficient for exhibiting its properties.;The polyethylene resin composition comprises, as a main polymer (A), a high pressure process low-density polyethylene and, as a sub-polymer (B), at least one kind of polyethylene selected from the group consisting of a metallocene-type low-density polyethylene and a high pressure process low-density polyethylene having an MFR larger than that of the main polymer (A), the polyethylene resin composition being, further, blended with a bleeding additive.

主权项

1. A direct-blow-formed container having an inner surface or an outer surface formed by using a polyethylene resin composition, wherein,
said polyethylene resin composition contains a main polymer (A) in an amount of 55 to 80% by weight, a sub-polymer (B) in an amount of not less than 2% by weight but less than 45% by weight and a bleeding additive in amount of not less than 0.1% by weight; said main polymer (A) is a high pressure process low density polyethylene having a density of not less than 0.910 g/cm3 but less than 0.930 g/cm3 and an MFR (190° C.) of not less than 0.1 g/10 min. but le/s than 5.0 g/10 min.; said sub-polymer (B) is composed of a high pressure process low-density polyethylene (B1) having an MFR (190° C.) of 5 to 100 g/10 min, and a metallocene-type low-density polyethylene (B2) having a density of 0.880 to 0.905 g/cm3,said high pressure process low-density polyethylene (B1) being contained in amount of 0.5 to 10% by weight and said metallocene-type low-density polyethylene (B2) being contained in an amount of not more than 44.5% by weight; and
said bleeding additive has a molecular weight of not less than 400.