High density polyethylene composition and closure

摘要

Disclosed is a high-density polyethylene (HDPE) composition that comprises at least a first high density polyethylene component having a density of 0.940-0.968 g/cm3 and a melt index I2.16 of 0.5-10.0 dg/min and a melt flow ratio (flow index I21.6 at 190° C. divided by melt index I2.16 at 190° C.) of at least 25. A second HDPE component may be included in the composition with melt index I2.16 of greater than 10 dg/min and melt flow ratio of 30 or less. The disclosed compositions are suitable for use in living hinge closure applications.

主权项

1. A hinged component, comprising:
a molded article having a hinge, the molded article being a polymer, the polymer comprising a mixture of a first high-density polyethylene (HDPE) resin and a second HDPE resin, that is different than the first HDPE, wherein, when mixed: the first high-density polyethylene (HDPE) resin has:
a. a Melt Index (I2.16) of about 0.5 dg/min to 10 dg/min,b. a Density of about 0.940 g/cm3 to 0.968 g/cm3, andc. a Melt Flow Ratio (I21.6:I2.16) greater than about 25; and the second HDPE resin has a Melt Flow Ratio (I21.6:I2.16) of less than about 30.