Polyethylene for injection molding and molded article using same
AssigneeJapan Polyethylene Corporation
InventorsKouichi OGAWA, Kenji HADANO, Kazuhiro KOBAYASHI
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Abstract
An object of the present invention is to provide a polyethylene for injection molding, which has an excellent balance between moldability and durability, and a molded article such as an injection-molded plastic fuel tank that has an excellent balance among injection moldability, durability, and impact resistance. The invention relates to a polyethylene for injection molding, the polyethylene comprising at least two types of specific polyethylenes, wherein the density, the high load melt flow rate, and the relationship between the weight ratio and the density of the polyethylene satisfy specific characteristics.
Claims6
A polyethylene for injection molding, comprising component (a) and component (b):
- Component (a):
- a polyethylene having a density of 0.910 to 0.940 g/cm3 and a high load melt flow rate (HLMFR) (test conditions:
- 190° C., a load of 21.6 kg) of 0.1 to 5.0 g/10 minutes;
- and
- Component (b):
- a polyethylene having a density of 0.960 to 0.980 g/cm3 and a melt flow rate (MFR) (test conditions:
- 190° C., a load of 2.16 kg) of 1 to 500 g/10 minutes,
- wherein the polyethylene satisfies characteristics (1) to (3):
- Characteristic (1):
- a density is 0.935 to 0.970 g/cm3,
- Characteristic (2):
- HLMFR is 50 to 200 g/10 minutes, and
- Characteristic (3):
- a relation of a weight ratio Wa (%) of the component (a) to the total weight of the component (a) and the component (b) and the density Da (g/cm3) of the component (a) satisfies the following formula (1):
- Wa≧832×Da−730 Formula (1).
Dependencies are inferred from the claim text.