KR-20260063990-A - OLEFIN-BASED POLYMER

Abstract

An olefin-based polymer according to one embodiment of the present invention may have (a) a melt index (MI, under 190°C and 2.16 kg load conditions) of 0.1 g/10 min or more and 30 g/10 min or less, (b) a density of 0.855 g/cc or more and 0.880 g/cc or less, and (c) satisfy the following mathematical formula 1. [Mathematical Formula 1] F(30) ≥ 2462.2 x density - 2094 Here, the above F (30) is the total amount of heat required to melt the crystalline phase at 30°C or higher, as confirmed by differential scanning calorimetry (SSA) analysis.

Inventors

• 박근태
• 정정연
• 신창훈
• 공진삼
• 박상은
• 신경수
• 이종철

Assignees

• 주식회사 엘지화학

Dates

Publication Date

20260507

Application Date

20241031

Claims (8)

1. Olefin-based polymers satisfying the requirements of (a) to (c) below: (a) The melt index (MI, 190℃ 2.16 kg load condition) is 0.1 g/10 min or more and 30 g/10 min or less, and (b) Density of 0.855 g/cc or more and 0.880 g/cc or less, and (c) Satisfies the following mathematical formula 1. [Mathematical Formula 1] F(30) ≥ 2462.2 x density - 2094 Here, the above F (30) is the total amount of heat required to melt the crystalline phase at 30°C or higher, as confirmed by differential scanning calorimetry (SSA) analysis.
2. In paragraph 1, (d) An olefinic polymer that additionally satisfies the requirement that F (30) is 10 or more and 80 or less when measured by the differential scanning calorimetry (SSA) method.
3. In paragraph 1, (e) An olefinic polymer that additionally satisfies the requirement of having a weight-average molecular weight (Mw) of 10,000 g/mol or more and 800,000 g/mol or less.
4. In paragraph 1, (f) An olefinic polymer that additionally satisfies the requirement that the molecular weight density (MWD) is 1.5 or greater and 2.4 or less.
5. In paragraph 1, The above olefin-based polymer is an olefin-based polymer having a melt flow rate ratio (MFRR) of 6 or more and 8 or less.
6. In paragraph 1, The above olefin polymer is an olefin polymer that is a copolymer of ethylene and an alpha-olefin comonomer having 3 to 12 carbon atoms.
7. In paragraph 6, The above alpha-olefin comonomer is an olefin-based polymer comprising any one or more mixtures selected from the group consisting of propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-decene, 1-undecene, 1-dodecene, 1-tetradecene, 1-hexadecene, and 1-eicocene.
8. In paragraph 6, The above olefinic polymer is an olefinic polymer that is a copolymer of ethylene and 1-butene.

Description

Olefin-based polymer The present invention relates to an olefin-based polymer, and specifically to an olefin-based polymer having excellent blocking characteristics through improved crystallinity. Polyolefins are widely used for extrusion, blow molding, and injection molding products due to their excellent moldability, heat resistance, mechanical properties, hygienic quality, water vapor permeability, and appearance characteristics of the molded products. However, polyolefins, particularly polyethylene, lack polar groups within their molecules, resulting in low compatibility with polar resins such as nylon and poor adhesion to polar resins and metals. Consequently, it has been difficult to blend polyolefins with polar resins or metals, or to laminate them with these materials. Furthermore, polyolefin molded products have the problem of low surface hydrophilicity and antistatic properties. To solve these problems and increase affinity for polar materials, a method of grafting a polar group-containing monomer onto a polyolefin via radical polymerization has been widely used. However, this method had a problem of low miscibility because intramolecular crosslinking and molecular chain cleavage of the polyolefin occurred during the graft reaction, resulting in poor viscosity balance between the graft polymer and the polar resin. In addition, there was a problem of poor appearance characteristics of the molded product due to gel components generated by intramolecular crosslinking or foreign substances generated by molecular chain cleavage. In addition, as a method for producing olefin polymers such as ethylene homopolymer, ethylene/α-olefin copolymer, propylene homopolymer, or propylene/α-olefin copolymer, a method of copolymerizing polar monomers under a metal catalyst, such as a titanium catalyst or a vanadium catalyst, has been used. However, when copolymerizing polar monomers using such metal catalysts, there is a problem of wide molecular weight distribution or composition distribution and low polymerization activity. Another method is known to be polymerization in the presence of a metallocene catalyst consisting of a transition metal compound such as zircononocene dichloride and an organoaluminum oxy compound (aluminoxane). When a metallocene catalyst is used, high molecular weight olefin polymers are obtained with high activity, and the resulting olefin polymers have a narrow molecular weight distribution and a narrow compositional distribution. In addition, a method for producing polyolefins containing polar groups using a metallocene catalyst is also known, which uses a metallocene compound having a ligand of a non-crosslinked cyclopentadienyl group, a crosslinked or non-crosslinked bis indenyl group, or an ethylene-crosslinked unsubstituted indenyl/fluorenyl group. However, these methods have the disadvantage of very low polymerization activity. For this reason, a method of protecting polar groups with a protecting group is being implemented, but when a protecting group is introduced, the process becomes complicated because this protecting group must be removed again after the reaction. Ansa-metallocene compounds are organometallic compounds containing two ligands connected to each other by a bridge group, wherein rotation of the ligands is prevented by the bridge group and the activity and structure of the metal center are determined. Such anssa-metallocene compounds are used as catalysts in the production of olefinic homopolymers or copolymers. In particular, it is known that anssa-metallocene compounds containing cyclopentadienyl-fluorenyl ligands can produce high molecular weight polyethylene, thereby enabling control of the microstructure of polypropylene. In addition, anssa-metallocene compounds containing indenyl ligands are known to be capable of producing polyolefins with excellent activity and improved stereoregularity. As such, various studies are being conducted on anssa-metallocene compounds capable of controlling the microstructure of olefinic polymers while possessing higher activity, but the extent of such research is still insufficient. Figure 1 is a graph showing the results of differential scanning calorimetry (SSA) measurements for the olefin-based polymers of Example 4 and Comparative Example 6. FIG. 2 is a graph showing the F (30) values according to density for the olefin-based polymers of Examples 1 to 5 and Comparative Examples 1, 4 to 7. Hereinafter, the present invention will be described in more detail to aid in understanding the invention. Terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention. The term “alkyl” as used herein means a straight-chain, cyclic, or branche