High-Density Polyethylene Compositions, Method of Making the Same, Injection Molded Articles Made Therefrom, and Method of Making Such Articles

Patent metadata

Field	Value
Publication number	US-2016237266-A1
Application number	US-201615135044-A
Country	US
Kind code	A1
Filing date	Apr 21, 2016
Priority date	May 2, 2007
Publication date	Aug 18, 2016
Grant date	—

Abstract

The instant invention is a high-density polyethylene composition, method of producing the same, injection molded articles made therefrom, and method of making such articles. The high-density polyethylene composition of the instant 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/cm 3 , 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 in the range of 0.965 to 0.980 g/cm 3 , and a melt index (I 2 ) in the range of 30 to 1500 g/10 minutes. The high-density polyethylene composition has a melt index (I 2 ) of at least 1, a density in the range of 0.950 to 0.960 g/cm 3 .

First claim

1 . A high-density polyethylene composition comprising:
a first component, said first component being a high molecular weight ethylene alpha-olefin copolymer having a density in the range of 0.920 to 0.946 g/cm 3 , and a melt index (I 21.6 ) in the range of 1 to 15 g/10 minutes; and a second component, said second component being a low molecular weight ethylene polymer having a density in the range of 0.965 to 0.980 g/cm 3 , and a melt index (I 2 ) in the range of 30 to 1500 g/10 minutes; wherein said high-density polyethylene composition having a melt index (I 2 ) of at least 1 g/10 minutes, a density in the range of 0.950 to 0.960 g/cm 3 .

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11 . The high-density polyethylene composition according to claim 1 , wherein said first component having a molecular weight in the range of 150,000 to 300,000 wherein said second component having a molecular weight in the range of 12,000 to 45,000.

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13 . The high-density polyethylene composition according to claim 1 , wherein said first component having a density in the range of 0.928 to 0.944 g/cm 3 , and a melt index (I 21.6 ) in the range of 2.5 to 11 g/10 minutes; wherein said second component having a density in the range of 0.965 to 0.975 g/cm 3 , and a melt index (I 2 ) in the range of 50 to 1000 g/10 minutes.

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16 . The high-density polyethylene composition according to claim 1 , wherein said high-density polyethylene composition having a single ATREF temperature peak, wherein said ATREF temperature peak having a temperature peak maximum between about 90° C. to about 105° C.; and wherein said high-density polyethylene composition having a calculated purge fraction of less than 15.5 percent.

19 . A method of producing a high-density polyethylene composition comprising the steps of:
introducing ethylene, and an alpha-olefin comonomer into a first reactor; polymerizing said ethylene in the presence of said alpha-olefin comonomer in said first reactor thereby producing a first component, wherein said first component being a high molecular weight ethylene alpha-olefin copolymer having a density in the range of 0.920 to 0.946 g/cm 3 , and a melt index (I 21 ) in the range of 1 to 15 g/10 minutes; introducing said first component and additional ethylene into a second reactor; polymerizing said additional ethylene in said second reactor thereby producing a second component, wherein said second component being a low molecular weight ethylene polymer having a density in the range of 0.965 to 0.980 g/cm 3 , and a melt index (I 2 ) in the range of 30 to 1500 g/10 minutes; and thereby producing said high-density polyethylene composition, wherein high-density polyethylene composition having a melt index (I 2 ) of at least 1 g/10 minutes, a density in the range of 0.950 to 0.960 g/cm 3 .

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40 . A bottle cap closure comprising:
a high-density polyethylene composition according to claim 1 .

41 . The bottle cap closure of according to claim 40 , wherein said high-density polyethylene composition having an environmental stress crack resistance of at least 10 hours measured via ASTM D-1693 condition B, 10% Igepal, or at least 100 hours measured via ASTM D-1693 condition B, 100% Igepal.

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43 . A method of producing an article comprising the steps of:
providing a high-density polyethylene composition comprising;
a first component, said first component being a high molecular weight ethylene alpha-olefin copolymer having a density in the range of 0.920 to 0.946 g/cm 3 , and a melt index (I 21.6 ) in the range of 1 to 15 g/10 minutes; and
a second component, said second component being a low molecular weight ethylene polymer having a density in the range of 0.965 to 0.980 g/cm 3 , and a melt index (I 2 ) in the range of 30 to 1500 g/10 minutes;
wherein said high-density polyethylene composition having a melt index (I 2 ) of at least 1 g/10 minutes, a density in the range of 0.950 to 0.960 g/cm 3 ;
compression molding, blow molding, or injection molding said high-density polyethylene composition thereby forming said article.

44 . The high-density polyethylene composition according to claim 1 , wherein said high-density polyethylene composition having a standard deviation of flow direction shrinkage of less than 7 percent across different colors.

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47 . The high-density polyethylene composition according to claim 1 , wherein said high-density polyethylene composition further comprising 100 to 10,000 ppm by weight of a nucleator.

48 . The high-density polyethylene composition according to claim 1 , wherein said high-density polyethylene composition further comprising 100 to 10,000 ppm by weight of potassium stearate or HPN-20E as a nucleator, wherein the inventive high-density polyethylene composition having a standard deviation of flow direction shrinkage of less than 4 percent across different colors.

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51 . The high-density polyethylene composition according to claim 1 , wherein said high-density polyethylene composition having a 1% secant modulus in psi of equal or greater to the following relationship [(7,492,165*density (g/cm 3 ))−6,975,000] psi/(g/cm 3 )).

Assignees

• Dow Global Technologies Llc

Inventors

• Michie Jr William J
• Whited Stephanie M
• Wiker Nathan J
• Elley-Bristow Dale M

Classifications

• H01B3/441

  from alkenes · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• B65D41/24

  Caps or cap-like covers made of shrinkable material or formed in situ by dipping, e.g. using gelatine or celluloid · CPC title

• B29C43/02

  of articles of definite length, i.e. discrete articles {(B29C35/0227 takes precedence)} · CPC title

• C08F210/16 Primary

  Copolymers of ethene with alpha-alkenes, e.g. EP rubbers · CPC title