High-density polyethylene composition

JP7873252B2Active Publication Date: 2026-06-11NOVA CHEM (INT) SA
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
NOVA CHEM (INT) SA
Filing Date
2022-03-16
Publication Date
2026-06-11

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Abstract

The polyethylene composition has a viscosity of 0.945 g / cm 3 or greater, a melt index I2 of 0.8 to 4.0 g / 10 min, an environmental stress crack resistance ESCR (determined by ASTM D1693 in 100% IGEPAL CO-630 under condition A or condition B) of greater than 400 hours, and a melt strength of 3.0 cN or greater.
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Claims

1. A polyethylene composition, (i) 5 to 50% by weight of a first ethylene copolymer having a weight-average molecular weight Mw exceeding 200,000 g / mol, (ii) 95-50% by weight of a second ethylene copolymer and Includes, The first ethylene copolymer has a higher weight-average molecular weight Mw than the second ethylene copolymer. The first ethylene copolymer has a number of short chain branches per 1,000 carbon atoms (SCB1) that is greater than the number of short chain branches per 1,000 carbon atoms (SCB2) of the second ethylene copolymer. Here, the weight-average molecular weights Mw of the first and second ethylene copolymers, as well as SCB1 and SCB2, are estimated values ​​determined by deconvolution of gel permeation chromatography (GPC) data of polyethylene compositions using Fourier transform infrared detection and modeling using the Flory distribution. The polyethylene composition contains 0.945 g / cm³ ３ The above densities, 0.8–4.0 g / 10 min, melt index I ２ , melt flow ratio I of 50 or more ２１ / I ２ A polyethylene composition having a molecular weight distribution Mw / Mn of less than 6.5; a Z-average molecular weight Mz of 250,000 g / mol or more; a Z-average molecular weight distribution Mz / Mw greater than 2.5; a long-chain branching coefficient LCBF greater than 0.0010; and an environmental stress crack resistance ESCR greater than 400 hours (determined by ASTM D1693 in 100% IGEPAL CO-630 under conditions A and B).

2. The polyethylene composition is 0.948 g / cm³ ３ ~0.957g / cm ３ The polyethylene composition according to claim 1, having the density of .

3. The polyethylene composition has a melt index of 1.0 to 2.5 g / 10 min. ２ A polyethylene composition according to claim 1, having the following characteristics.

4. The polyethylene composition has a melt flow ratio I of 60 to 130 ２１ / I ２ The polyethylene composition according to claim 1

5. The polyethylene composition according to claim 1, wherein the polyethylene composition has a molecular weight distribution Mw / Mn of 3.0 to 6.

0.

6. The polyethylene composition according to claim 1, wherein the polyethylene composition has a Z-average molecular weight distribution Mz / Mw of 3.0 to 5.

0.

7. The polyethylene composition according to claim 1, wherein the polyethylene composition has a Z-average molecular weight Mz of 250,000 g / mol to 550,000 g / mol.

8. Polyethylene composition has a composition distribution index (CDBI) of less than 50%. ５０ A polyethylene composition according to claim 1, having the following characteristics.

9. Polyethylene composition with a composition distribution index CDBI of over 60% ５０ A polyethylene composition according to claim 1, having the following characteristics.

10. The polyethylene composition according to claim 1, wherein the first ethylene copolymer has more than 2 short-chain branches (SCB1 / 1000C) per 1000 carbon atoms.

11. The polyethylene composition according to claim 1, wherein the first ethylene has more than 5 short-chain branches (SCB1 / 1000C) per 1000 carbon atoms.

12. The first ethylene copolymer is present in a concentration of 0.910–0.932 g / cm³. ３ It has a density of, The density in question is given by the following formula: [Math 1] The polyethylene composition according to claim 1, wherein the estimated value calculated using (wherein ρ1 is the density of the first ethylene copolymer, and Mw, Mn, Mz, and SCB of the first ethylene copolymer are determined by deconvolving gel permeation chromatography (GPC) data of the polyethylene composition using Fourier transform infrared detection and modeling it using a Flory distribution).

13. The second ethylene copolymer is present in a concentration of 0.950–0.970 g / cm³. ３ It has a density of, The density in question is given by the following formula: [Math 2] The polyethylene composition according to claim 1, wherein the estimated value is calculated using the formula (wherein ρ is the density of the polyethylene composition, ρ1 and ρ2 are the densities of the first and second ethylene copolymers, and w1 and w2 are the weight fractions of the first and second ethylene copolymers).

14. The first ethylene copolymer has a melt index of less than 0.5 g / 10 min. ２ It has, The melt index I² is given by the following formula: [Math 3] The polyethylene composition according to claim 1, wherein the estimated values ​​calculated using (wherein Mw and Mn of the first ethylene copolymer are determined by deconvolving gel permeation chromatography (GPC) data of the polyethylene composition using Fourier transform infrared detection and modeling it using a Flory distribution).

15. The second ethylene copolymer has a melt index of 10.0 g / 10 mins. ２ It has, The melt index I² is given by the following formula: [Math 4] The polyethylene composition according to claim 1, wherein the estimated values ​​calculated using (wherein Mw and Mn of the second ethylene copolymer are determined by deconvolving gel permeation chromatography (GPC) data of the polyethylene composition using Fourier transform infrared detection and modeling it using a Flory distribution).

16. The polyethylene composition according to claim 1, wherein the ratio of the number of short-chain branches per 1,000 carbon atoms in the first ethylene copolymer (SCB1 / 1000C) to the number of short-chain branches per 1,000 carbon atoms in the second ethylene copolymer (SCB2 / 1000C) is greater than 10.

17. The polyethylene composition according to claim 1, wherein the first ethylene copolymer is produced using a single-site catalyst.

18. The polyethylene composition according to claim 1, wherein the second ethylene copolymer is produced using a single-site catalyst or a Ziegler-Natta catalyst.

19. The polyethylene composition according to claim 1, wherein the polyethylene composition has hafnium residues present in an amount of at least 0.050 ppm based on the weight of the polyethylene composition.

20. The polyethylene composition according to claim 1, wherein the polyethylene composition has a long-chain branching coefficient LCBF greater than 0.0050.

21. The polyethylene composition has a shear viscosity index (SHI) of 7.5 or higher. （１，１００） A polyethylene composition according to claim 1, having the following characteristics.

22. The polyethylene composition has a shear viscosity index (SHI) of 10.0 or higher. （１，１００） A polyethylene composition according to claim 1, having the following characteristics.

23. The polyethylene composition according to claim 1, wherein the polyethylene composition has a relative modulus of elasticity G' / G'' ≤ 0.50 at 0.05 rad / s.

24. The polyethylene composition according to claim 1, wherein the polyethylene composition has an Izod impact strength greater than 1.5 foot-pounds / inch.

25. The polyethylene composition according to claim 1, wherein the polyethylene composition has a melt strength of 3.0 cN or more.

26. The polyethylene composition according to claim 1, wherein the polyethylene composition has an environmental stress crack resistance (ESCR) of more than 1,000 hours (determined by ASTM D1693 in 100% IGEPAL CO-630 under conditions A and B).

27. The polyethylene composition according to claim 1, wherein the polyethylene composition has a bending secant modulus of 1% at 1000 MPa or more.

28. A polyethylene composition, (i) 5 to 50% by weight of a first ethylene copolymer having a weight-average molecular weight Mw exceeding 200,000 g / mol, (ii) 95-50% by weight of a second ethylene copolymer and Includes, The first ethylene copolymer has a higher weight-average molecular weight Mw than the second ethylene copolymer. The first ethylene copolymer has a number of short chain branches per 1,000 carbon atoms (SCB1) that is greater than the number of short chain branches per 1,000 carbon atoms (SCB2) of the second ethylene copolymer. Here, the weight-average molecular weights Mw of the first and second ethylene copolymers, as well as SCB1 and SCB2, are estimated values ​​determined by deconvolution of gel permeation chromatography (GPC) data of polyethylene compositions using Fourier transform infrared detection and modeling using the Flory distribution. The polyethylene composition contains 0.945 g / cm³ ３ The above densities, 0.8–4.0 g / 10 min, melt index I ２ , melt flow ratio I of 50 or more ２１ / I ２ Molecular weight distribution less than 6.5 Mw / Mn; Z-average molecular weight Mz greater than 250,000 g / mol; Z-average molecular weight distribution greater than 2.5 Mz / Mw; long-chain branching coefficient LCBF greater than 0.0010; compositional distribution width index CDBI less than 50%. ５０ A polyethylene composition having an Izod impact strength exceeding 3.0 foot-pounds / inch, and an environmental stress crack resistance (ESCR) exceeding 1000 hours (as determined by ASTM D1693 in 100% IGEPAL CO-630 under conditions A and B).

29. A polyethylene composition, (i) 5 to 50% by weight of a first ethylene copolymer having a weight-average molecular weight Mw exceeding 200,000 g / mol, (ii) 95-50% by weight of a second ethylene copolymer and Includes, The first ethylene copolymer has a higher weight-average molecular weight Mw than the second ethylene copolymer. The first ethylene copolymer has a number of short chain branches per 1,000 carbon atoms (SCB1) that is greater than the number of short chain branches per 1,000 carbon atoms (SCB2) of the second ethylene copolymer. Here, the weight-average molecular weights Mw of the first and second ethylene copolymers, as well as SCB1 and SCB2, are estimated values ​​determined by deconvolution of gel permeation chromatography (GPC) data of polyethylene compositions using Fourier transform infrared detection and modeling using the Flory distribution. The polyethylene composition contains 0.945 g / cm³ ３ The above densities, 0.8–4.0 g / 10 min, melt index I ２ , melt flow ratio I of 50 or more ２１ / I ２ , molecular weight distribution Mw / Mn less than 6.5; Z-average molecular weight Mz greater than 250,000 g / mol; Z-average molecular weight distribution Mz / Mw greater than 2.5; long-chain branching coefficient LCBF greater than 0.0010; compositional distribution width index CDBI greater than 60% ５０ A polyethylene composition having an Izod impact strength exceeding 1.5 foot-pounds / inch, and an environmental stress crack resistance (ESCR) exceeding 400 hours (as determined by ASTM D1693 in 100% IGEPAL CO-630 under conditions A and B).

30. A cap or closure prepared from the polyethylene composition according to claim 1, 28, or 29.

31. A rotationally molded article prepared from the polyethylene composition according to claim 1, 28, or 29.

32. A foamed molded article prepared from the polyethylene composition according to claim 1, 28, or 29.