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WO-2026095461-A1 - HIGH-DENSITY POLYETHYLENE AND FILM COMPRISING SAME

WO2026095461A1WO 2026095461 A1WO2026095461 A1WO 2026095461A1WO-2026095461-A1

Abstract

High-density polyethylene according to the present invention can improve both processability and excellent moisture barrier properties, without degradation of physical properties during film processing and without blending with low-density polyethylene or the like, through fine control of a melt flow index, a polydispersity index (PDI), and elongation viscosity, in addition to having a high density.

Inventors

  • LEE, JINSEOK
  • LEE, Hyojoon
  • LEE, DAE SUB
  • LEE, Naeun
  • CHO, SOO WON
  • KWON, HEON YONG
  • LEE, Seung Muk
  • KIM, MYUNG JIN
  • PARK, Nayoung
  • JANG, CHANG HWAN
  • SUN, Ka Ram
  • JEON, MANSEONG
  • LEE, Jeongyong

Assignees

  • 주식회사 엘지화학

Dates

Publication Date
20260507
Application Date
20251021
Priority Date
20241031

Claims (14)

  1. The density is 0.965 g/cm³ or greater and 0.975 g/cm³ or less, and The melt flow index (MI 2.16 , measured at 190 ℃, and a 2.16 kg load) is 0.1 g/10 min or more and 5.0 g/10 min or less, and The polydispersity index (PDI, Mw/Mn) is between 20 and 60, and Elongational viscosity (@strain 2.5) of 30,000 Pa·S or more and 90,000 Pa·S or less, High-density polyethylene.
  2. In paragraph 1, The above polyethylene is an ethylene homopolymer, High-density polyethylene.
  3. In paragraph 1, A high-load melt flow index (MI 21.6 , measured at 190 ℃, 21.6 kg load) of 180 g/10 min or more and 300 g/10 min or less, High-density polyethylene.
  4. In paragraph 1, A melt flow ratio (MI 21.6 / MI 2.16 ) of 150 or more and 250 or less, High-density polyethylene.
  5. In paragraph 1, melting points (Tm) of 130 ℃ or higher and 140 ℃ or lower, High-density polyethylene.
  6. In paragraph 1, A weight-average molecular weight (Mw) of 120,000 g/mol to 200,000 g/mol, High-density polyethylene.
  7. In paragraph 1, In a GPC curve graph where the x-axis is Log Mw and the y-axis is dw/dlogMw, the integral value in the region where the Log Mw value is between 2 and 3 (inclusive) is between 3% and 10% of the total integral value, High-density polyethylene.
  8. In paragraph 1, In a GPC curve graph where the x-axis is Log Mw and the y-axis is dw/dlogMw, the integral value in the region where the Log Mw value is between 2 and 4 is between 38% and 50% of the total integral value, High-density polyethylene.
  9. In paragraph 1, In a GPC curve graph where the x-axis is Log Mw and the y-axis is dw/dlogMw, the integral value in the region where the Log Mw value is 6 or greater and 7 or less is 1% or greater and 5% or less of the total integral value, High-density polyethylene.
  10. In paragraph 1, Complex viscosity measured at an angular frequency of 0.1 rad/s is 10,000 Pa·s or more and 16,000 Pa·s or less, High-density polyethylene.
  11. In paragraph 1, High-density polyethylene having a complex viscosity of 600 Pa·s or more and 900 Pa·s or less, measured at an angular velocity of 100 rad/s.
  12. In paragraph 1, The ratio of the complex viscosity measured at an angular velocity of 0.1 rad/s to the complex viscosity measured at an angular velocity of 100 rad/s (η* (0.1 rad/s)) / η*(100 rad/s)) is between 10 and 30, High-density polyethylene.
  13. A high-density polyethylene according to claim 1, having a water vapor transmission rate (WVTR) of 1 g/ m² /day or less based on a film thickness of 50 μm, Polyethylene film.
  14. In Paragraph 13, When manufacturing a blown film with a thickness of 50 μm under conditions of a temperature of 230℃, FLH (Frost Line Height) of 160 mm, and BUR 2.5, the resin pressure is 80 bar or less, Polyethylene film.

Description

High-density polyethylene and films containing the same Cross-citation with related applications This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0152544 filed October 31, 2024 and Korean Patent Application No. 10-2025-0151703 filed October 20, 2025, and all contents disclosed in the documents of said Korean patent applications are incorporated herein as part of this specification. The present invention relates to high-density polyethylene having excellent processability along with moisture barrier properties, and a film containing the same. Polyethylene is a general-purpose polymer widely used in various applications such as packaging films, pipes, and containers, and is broadly classified into high-density polyethylene (HDPE), low-density polyethylene (LDPE), and linear low-density polyethylene (LLDPE) depending on its density. Recently, in order to increase the recycling rate of various packaging films for food, household use, and electronic products, there is growing interest in films made entirely of polyethylene (All-PE film), such as linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), medium-density polyethylene (MDPE), and high-density polyethylene (HDPE), instead of the conventionally used aluminum foil (Al foil), nylon, or ethylene vinyl alcohol (EVOH). In addition, to replace other materials used for barrier applications, it is necessary to ensure the moisture and oxygen barrier properties of 100% polyethylene films (All-PE films). Among polyethylenes, HDPE has a high density and a large number of crystalline regions, so it offers superior moisture and oxygen barrier properties compared to other polyethylenes such as low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE). Accordingly, HDPE can serve as a barrier film that blocks moisture penetration. However, because HDPE is non-polar, its oxygen barrier properties are inferior to those of conventionally used materials such as aluminum foil, nylon, and EVOH. Accordingly, in order to increase the recycling rate of various packaging films, there is a need to develop a method that utilizes HDPE films applicable to fields requiring stiffness, such as VFFS (vertical form fill seal), while also significantly improving processability through excellent moisture barrier properties and superior bubble stability at low resin pressures and process temperatures during film processing. Figure 1 shows a GPC graph measured for high-density polyethylene of Examples 1 and 3 and Comparative Example 1 according to one embodiment of the present invention. FIG. 2 shows a graph of the ARES analysis results measured for high-density polyethylene of Examples 1 and 3 and Comparative Example 1 according to one embodiment of the present invention. FIG. 3 shows a graph of the elongation viscosity measured for high-density polyethylene of Examples 1 and 3 and Comparative Example 1 according to one embodiment of the present invention. In the present invention, terms such as first, second, etc. are used to describe various components, and these terms are used solely for the purpose of distinguishing one component from another component. Furthermore, the terms used herein are used merely to describe exemplary embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “comprising,” “comprising,” or “having” are intended to specify the existence of the implemented features, numbers, steps, components, or combinations thereof, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, components, or combinations thereof. Additionally, terms such as "approximately" and "substantially" used throughout this specification are used to mean at or near the stated value when inherent manufacturing and material tolerances are presented in the stated meaning, and are used to prevent unscrupulous infringers from unfairly exploiting the disclosure in which precise or absolute values are mentioned to aid in understanding the invention. In addition, in this specification, "part by weight" refers to a relative concept in which the weight of one substance is expressed as a ratio to the weight of another substance. For example, in a mixture containing 50 g of substance A, 20 g of substance B, and 30 g of substance C, the amounts of substance B and substance C are 40 parts by weight and 60 parts by weight, respectively, based on 100 parts by weight of substance A. In addition, "weight % (% by weight)" refers to an absolute concept in which the weight of a substance is expressed as a percentage of the total weight. In the mixture given as an example above, the content of substance A, substance B, and substance C is 50 weight%, 20 weight%, and 30 weight%, respectively, out of 100% of the total weight of the mixture. At this time,