high density polyethylene composition, method for producing a high density polyethylene composition, article, bottle cap, method for improving bottle cap, and method for producing an article

摘要

HIGH DENSITY POLYETHYLENE COMPOSITION, METHOD FOR PRODUCING HIGH DENSITY POLYETHYLENE COMPOSITION, ITEM, BOTTLE COVER, METHOD FOR IMPROVING BOTTLE COVER AND METHOD FOR PRODUCING AN ARTICLE. The present invention is a high density polyethylene composition, method for producing same, injection molded articles made therewith, and method for producing such articles. The high density polyethylene composition of the present invention includes a first component, and a second component. The first component is a high molecular weight ethylene / alpha-olefin copolymer having a density in the range of 0.920 to 0.946 g / cm3, and a melt index (I ~ 21.6 ~) in the range of 1 to 15 g / 10 minutes. The second component is a low molecular weight ethylene polymer having a density of 0.965 to 0.980 g / cm3 and a melt index (1-2) in the range of 30 to 1500 g / 10 minutes. The high density polyethylene composition has a melt index (1-2) of at least 1 g / 10 minutes, a density in the range of 0.950 to 0.960 g / cm3. The method for producing a high density polyethylene composition includes the following steps: (1) introducing ethylene, and one or more alpha olefin comonomers into a first reactor; (2) (co) polymerize ethylene in the presence of one or more alpha olefin comonomers in the first reactor thereby producing a first component, the first component being a high molecular weight ethylene / alpha olefin copolymer having a density in the range of 0.920 to 0.946 g / cm3 and a melt index (1-21.6) in the range of 1 to 15 g / 10 minutes; (3) introducing the first component and additional ethylene into a second reactor; (4) polymerizing the additional ethylene in the second reactor thereby producing a second component, the second component being a low molecular weight ethylene polymer having a density in the range of 0.965 to 0.980 g / cm3 3, and an index of melting (1-2) in the range of 30 to 1500 g / 10 minutes; and (5) thereby producing the high density polyethylene composition, wherein the high density polyethylene composition has a melt index (I ~ 2 ~) of at least 1, a density in the range 0.950 to 0.960 9 / cm ^ 3 ^. Injection molded articles according to the present invention comprise the inventive high density polyethylene composition described above, and such articles are made via injection molding.