Polymer composition for caps and closures

Patent metadata

Field	Value
Publication number	US-2016333172-A1
Application number	US-201515109849-A
Country	US
Kind code	A1
Filing date	Jan 5, 2015
Priority date	Jan 6, 2014
Publication date	Nov 17, 2016
Grant date	—

Abstract

A polyethylene composition suitable for making into caps and closures is described, which has a density of 950-960 kg/m 3 , a SHI (1/100) of 4-12, a melt index MI 2 between 0.2 and 2 g/10 min, and a relationship between spiral flow ‘SF’ (measured in mm at 250° C./1000 bar/100 mm/s) and ESCR ‘E’ (measured in hours) of E>200−SF, or alternatively has a density of 950-960 kg/m 3 , a SHI (1/100) of 4-12, a melt index MI 2 between 0.2 and 2 g/10 min, and a relationship between spiral flow ‘SF’, ESCR ‘E’ and melt index ‘MI 2 ’ (measured in g/10 min according to ISO 1133 at 190° C. at load of 2.16 kg) of E>(9800−36SF−1000MI 2 )/60.

First claim

1 - 13 . (canceled)

14 . Polyethylene composition having a density of 950-960 kg/m 3 , a SHI (1,100) of 4-12, a melt index MI 2 between 0.2 and 2 g/10 min, and a relationship between spiral flow ‘SF’ (measured in mm at 250° C./1000 bar/100 mm/s) and ESCR ‘E’ (measured in hours) of E>200−SF.

15 . Composition according to claim 14 , wherein the relationship between spiral flow ‘SF’ (measured in mm at 250° C./1000 bar/100 mm/s) and ESCR ‘E’ (measured in hours) is E>370−2SF and preferably E>540−3SF.

16 . Polyethylene composition having a density of 950-960 kg/m3, a SHI(1,100) of 4-12, a melt index MI2 between 0.2 and 2 g/10 min, and a relationship between spiral flow ‘SF’ (measured in mm at 250° C./1000 bar/100 mm/s), ESCR ‘E’ (measured in hours) and melt index ‘MI2’ (measured in g/10 min according to ISO 1133 at 190° C. at load of 2.16 kg) of E>(9800-36SF−1000MI2)/60.

17 . Composition according to claim 16 , wherein the relationship between spiral flow ‘SF’, ESCR ‘E’ and melt index ‘MI2’ is E>(11000−36SF−1000MI2)/60 and preferably E>(12000−36SF−1000MI2)/60.

18 . Composition according to claim 14 , which has a SHI(1,100) between 4 and 10, preferably between 4 and 8.

19 . Composition according to claim 14 , which has a molecular weight distribution (Mw/Mn) (measured by GPC analysis) between 5 and 13, preferably between 6 and 12, more preferably between 7 and 11.

20 . Composition according to claim 14 , which has a relationship between spiral flow ‘SF’ (measured in mm at 250° C./1000 bars/100 mm/s) and solubles ‘S’ (measured in g/kg) of S<0.1SF, preferably S<0.1SF−2.5 and more preferably S<0.1SF−5.

21 . Composition according to claim 14 , which comprises 48-62 wt %, preferably 50-60 wt % of an ethylene polymer (A) and 38-52 wt %, preferably 40-50 wt % of an ethylene copolymer (B), copolymer (B) having a higher weight average molecular weight Mw than polymer (A).

22 . Composition according to claim 14 , wherein ethylene polymer (A) is a copolymer, and has a density between 969 and 974 kg/m3 and a MI2 of from 10 to 800 g/10 min.

23 . Composition according to claim 14 , which has a density between 950 to 954 kg/m3 and an MI2 of between 1 and 2 g/10 min, preferably a density between 951 to 954 kg/m3 and an MI2 of between 1.2 and 1.8 g/10 min.

24 . Composition according to claim 14 , which has a density between 954 to 960 kg/m3 and an MI2 of between 0.1 and 1 g/10 min, preferably a density between 955 to 959 kg/m3 and a MI2 of between 0.2 and 0.8 g/10 min.

25 . Composition according to claim 14 , which has a density between 950 to 954 kg/m3 and an MI2 of between 1 and 2 g/10 min, preferably a density between 951 to 954 kg/m3 and an MI2 of between 1.2 and 1.8 g/10 min, wherein the density of copolymer (B) is between 919 and 936 kg/m3 preferably between 924 and 932 kg/m3, and the HLMI of copolymer (B) is from 3 to 6 g/10 min, preferably from 4 to 5 g/10 min.

26 . Composition according to claim 14 , which has a density between 954 to 960 kg/m3 and an MI2 of between 0.1 and 1 g/10 min, preferably a density between 955 to 959 kg/m3 and a MI2 of between 0.2 and 0.8 g/10 min, wherein the density of copolymer (B) is between 929 and 947 kg/m3, preferably between 934 and 942 kg/m3 the HLMI of the copolymer (B) is from 0.2 to 2 g/10 min, preferably from 0.5 to 1.5 g/10 min.

27 . Composition according to claim 16 , which has a SHI(1,100) between 4 and 10, preferably between 4 and 8.

28 . Composition according to claim 16 , which has a molecular weight distribution (Mw/Mn) (measured by GPC analysis) between 5 and 13, preferably between 6 and 12, more preferably between 7 and 11.

29 . Composition according to claim 16 , which has a relationship between spiral flow ‘SF’ (measured in mm at 250° C./1000 bars/100 mm/s) and solubles ‘S’ (measured in g/kg) of S<0.1SF, preferably S<0.1SF−2.5 and more preferably S<0.1SF−5.

30 . Composition according to claim 16 , which comprises 48-62 wt %, preferably 50-60 wt % of an ethylene polymer (A) and 38-52 wt %, preferably 40-50 wt % of an ethylene copolymer (B), copolymer (B) having a higher weight average molecular weight Mw than polymer (A).

31 . Composition according to claim 16 , wherein ethylene polymer (A) is a copolymer, and has a density between 969 and 974 kg/m3 and a MI2 of from 10 to 800 g/10 min.

32 . Composition according to claim 16 , which has a density between 950 to 954 kg/m3 and an MI2 of between 1 and 2 g/10 min, preferably a density between 951 to 954 kg/m3 and an MI2 of between 1.2 and 1.8 g/10 min.

33 . Composition according to claim 16 , which has a density between 954 to 960 kg/m3 and an MI2 of between 0.1 and 1 g/10 min, preferably a density between 955 to 959 kg/m3 and a MI2 of between 0.2 and 0.8 g/10 min.

34 . Composition according to claim 16 , which has a density between 950 to 954 kg/m3 and an MI2 of between 1 and 2 g/10 min, preferably a density between 951 to 954 kg/m3 and an MI2 of between 1.2 and 1.8 g/10 min, wherein the density of copolymer (B) is between 919 and 936 kg/m3 preferably between 924 and 932 kg/m3, and the HLMI of copolymer (B) is from 3 to 6 g/10 min, preferably from 4 to 5 g/10 min.

35 . Composition according to claim 16 , which has a density between 954 to 960 kg/m3 and an MI2 of between 0.1 and 1 g/10 min, preferably a density between 955 to 959 kg/m3 and a MI2 of between 0.2 and 0.8 g/10 min, wherein the density of copolymer (B) is between 929 and 947 kg/m3, preferably between 934 and 942 kg/m3 the HLMI of the copolymer (B) is from 0.2 to 2 g/10 min, preferably from 0.5 to 1.5 g/10 min.

Assignees

• Ineos Europe Ag

Inventors

• Koch Benoit
• Moineau Cristophe

Classifications

• C08F2500/03

  Narrow molecular weight distribution, i.e. Mw/Mn < 3 · CPC title

• C08L23/06 Primary

  Polyethylene · CPC title

• C08L2207/062

  HDPE · CPC title

• C08F2500/19

  Shear ratio or shear ratio index · CPC title

• C08F10/02

  Ethene · CPC title