Polyolefin resin composition and molded article produced therefrom

Abstract

The polyolefin resin composition of the present invention is characterized by including: about 100 parts by weight of a base material including about 65 wt% to about 90 wt% of a propylene-ethylene-1-butene copolymer, about 5 wt% to about 15 wt% of an ethylene-propylene elastomer, and about 5 wt% to about 20 wt% of a propylene-ethylene elastomer; about 0.1 parts by weight to about 10 parts by weight of a maleic anhydride grafted polypropylene; and about 5 parts by weight to about 15 parts by weight of a polyethylene resin. The polyolefin resin composition has excellent adhesion strength with respect to a polar substrate (aluminum or the like) and excellent heat resistance, electrolyte resistance, and plasticity, etc.

Description

Technical Field

[0001] This invention relates to polyolefin resin compositions and molding articles made from polyolefin resin compositions. More specifically, this invention relates to polyolefin resin compositions having good properties in terms of adhesion strength to polar substrates (such as aluminum), heat resistance, electrolyte resistance, and plasticity, as well as molding articles made from polyolefin resin compositions. Background Technology

[0002] Multilayer laminates are widely used as packaging materials for products requiring high-quality preservation, such as food, pharmaceuticals, and electronic devices. Laminates used for this purpose typically consist of a multilayer structure, including a polar substrate layer with good impermeability (resistance to gases such as oxygen) and a non-polar polyolefin resin layer with good moisture and chemical resistance.

[0003] Among polyolefin resins, polypropylene resins are widely used as thermoplastic molding materials due to their good heat resistance, chemical resistance, and rigidity. However, they are often modified with acids to exhibit adhesion to polar substrate layers. Additionally, elastomers are often blended with polypropylene resins to impart elasticity and wettability, thereby improving the adhesive strength of the polypropylene resin. Furthermore, due to the insufficient gas permeability resistance of polypropylene resins, they are often used in multilayer laminates with polar materials to compensate for this deficiency. However, because polypropylene resins are non-polar, they exhibit poor adhesion to polar materials with good gas permeability resistance, such as polyamide resins, ethylene-vinyl alcohol copolymers, and metals.

[0004] To address these issues, acid-modified polypropylene, prepared by modifying polypropylene resin with unsaturated carboxylic acids or their derivatives, has been widely used in the prior art. However, the use of such acid-modified polypropylene alone is limited due to its lack of elasticity and wettability. Accordingly, when used as an adhesive resin, acid-modified polypropylene is typically blended with polypropylene resin and elastomer components. To obtain packaging materials exhibiting good adhesion and resistance to whitening (especially at low heat levels) and suitable for molding methods such as co-extrusion, layer coating, and lamination, studies have been conducted on incorporating 40 wt% or more of amorphous elastomers. However, such a high content of amorphous elastomers can compromise the overall crystallinity of the resulting composition, leading to a significant deterioration in the composition's thermal stability and chemical resistance.

[0005] Therefore, polyolefin resin compositions with good properties in terms of adhesion strength to polar substrates (such as aluminum), heat resistance, electrolyte resistance, and plasticity are needed.

[0006] The background technology of this invention is disclosed in Japanese Unexamined Patent Publication No. Heisei 9-111069, Japanese Unexamined Patent Publication No. Heisei 4-300933, Korean Patent Registration No. 10-2409543, etc. Summary of the Invention

[0007] [Technical Issues]

[0008] One object of the present invention is to provide a polyolefin resin composition that has good properties in terms of adhesion strength to a polar substrate (such as aluminum), heat resistance, electrolyte resistance and plasticity.

[0009] Another object of the present invention is to provide a molded article formed from a polyolefin resin composition.

[0010] The above and other objectives of the present invention can be achieved by means of embodiments of the present invention described below.

[0011] [Technical Solution]

[0012] 1. One aspect of the present invention relates to a polyolefin resin composition. The polyolefin resin composition comprises: about 100 parts by weight of a base material comprising about 65 wt% to about 90 wt% of a propylene-ethylene-1-butene copolymer, about 5 wt% to about 15 wt% of an ethylene-propylene elastomer and about 5 wt% to about 20 wt% of a propylene-ethylene elastomer; about 0.1 to about 10 parts by weight of maleic anhydride-grafted polypropylene; and about 5 to about 15 parts by weight of a polyethylene resin.

[0013] 2. In embodiment 1, the propylene-ethylene-1-butene copolymer may be a random copolymer of propylene-ethylene-1-butene comprising about 85 mol% to about 98 mol% of propylene-derived component, about 1 mol% to about 7 mol% of ethylene-derived component and about 1 mol% to about 8 mol% of 1-butene-derived component.

[0014] 3. In embodiment 1 or 2, the propylene-ethylene-1-butene copolymer may have a melt flow index of about 0.1 g / 10 min to about 20 g / 10 min as measured by ASTM D1238 at 230°C under a load of 2.16 kg.

[0015] 4. In embodiments 1 to 3, the ethylene-propylene elastomer may include about 65 wt% to about 85 wt% of an ethylene-derived component and about 15 wt% to about 35 wt% of a propylene-derived component.

[0016] 5. In embodiments 1 to 4, the ethylene-propylene elastomer may have a melt flow index of about 0.1 g / 10 min to about 3 g / 10 min, as measured by ASTM D1238 at 190°C under a load of 2.16 kg.

[0017] 6. In embodiments 1 to 5, the propylene-ethylene elastomer may include about 75 wt% to about 95 wt% of a propylene-derived component and about 5 wt% to about 25 wt% of an ethylene-derived component.

[0018] 7. In embodiments 1 to 6, the propylene-ethylene elastomer may have a melt flow index of about 5 g / 10 min to about 15 g / 10 min as measured by ASTM D1238 at 230°C under a load of 2.16 kg.

[0019] 8. In embodiments 1 to 7, the maleic anhydride-grafted polypropylene may include about 0.5 wt% to about 5 wt% of maleic anhydride-derived components.

[0020] 9. In embodiments 1 to 8, the polyethylene resin may include at least one of low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), or high-density polyethylene (HDPE).

[0021] 10. In embodiments 1 to 9, the weight ratio of ethylene-propylene elastomer to propylene-ethylene elastomer can range from about 1:0.9 to about 1:2.

[0022] 11. In embodiments 1 to 10, the polyolefin resin composition may have an adhesive strength (peel strength) of about 18 N / 15 mm to about 25 N / 15 mm as measured on a sample according to ASTM D1876 (T-peel test) by the following steps: wherein a double-layer film consisting of a layer of polyolefin resin composition and a layer of polypropylene resin is formed by using a multilayer film forming machine, and the double-layer film is attached to an aluminum film with nylon attached, the layer of polyolefin resin composition being adjacent to the aluminum film, and the sample is prepared by heating to 200°C and holding for 5 minutes, and wherein the adhesive strength is measured by cutting the sample into 100 mm × 15 mm (length × width) dimensions and peeling the aluminum film and the layer of polypropylene resin at a rate of 50 mm / min.

[0023] 12. In embodiments 1 to 11, the polyolefin resin composition may have an adhesive strength (peel strength) of about 11 N / 15 mm to about 24 N / 15 mm as measured on a sample according to ASTM D1876 by the following steps: wherein a bilayer film consisting of a layer of polyolefin resin composition and a layer of polypropylene resin is formed by using a multilayer film forming machine, and the bilayer film is attached to an aluminum film with nylon attached, the layer of polyolefin resin composition being adjacent to the aluminum film, and the sample is prepared by heating to 200°C and holding for 5 minutes, and wherein the adhesive strength is measured by cutting the sample to a size of 100 mm × 25 mm (length × width), immersing the sample in an organic electrolyte (1 M LiPF6 (EC:DMC:DEC = 1:1:1)) at 85°C for 24 hours, trimming both sides of the sample to prepare a test piece with a length of 100 mm and a width of 15 mm, and peeling the aluminum film and the polypropylene resin layer at a rate of 50 mm / min.

[0024] 13. In embodiments 1 to 12, the polyolefin resin composition may have a melt flow index of about 0.1 g / 10 min to about 15 g / 10 min, as measured according to ASTM D1238 at 230°C under a load of 2.16 kg.

[0025] 14. Another aspect of the present invention relates to a molding article. The molding article is formed from a polyolefin resin composition according to embodiments 1 to 13.

[0026] [Beneficial Effects]

[0027] Embodiments of the present invention provide a polyolefin resin composition having good properties in terms of adhesion strength to a polar substrate (such as aluminum), heat resistance, electrolyte resistance and plasticity, as well as a molded article formed from the polyolefin resin composition. Detailed Implementation

[0028] [Best Mode]

[0029] The embodiments of the present invention will be described in detail below.

[0030] The polyolefin resin composition according to the present invention comprises: (A) a propylene-ethylene-1-butene copolymer; (B) an ethylene-propylene elastomer; (C) a propylene-ethylene elastomer; (D) maleic anhydride-grafted polypropylene; and (E) a polyethylene resin.

[0031] In this article, when used to represent a specific numerical range, "a to b" is defined as "≥a and ≤b".

[0032] (A) Propylene-ethylene-1-butene copolymer

[0033] When used in combination with ethylene-propylene elastomers, propylene-ethylene elastomers, maleic anhydride-grafted polypropylene and polyethylene resins, the propylene-ethylene-1-butene copolymer according to one embodiment of the invention is used to improve the properties of polyolefin resin compositions, such as adhesion strength to polar substrates (e.g., aluminum), heat resistance, electrolyte resistance and plasticity, and may include any propylene-ethylene-1-butene copolymer used in typical thermoplastic resin compositions.

[0034] In some embodiments, the propylene-ethylene-1-butene copolymer may be a random copolymer comprising: about 85 mol% to about 98 mol% (e.g., about 90 mol% to about 95 mol%) of a propylene-derived component; about 1 mol% to about 7 mol% (e.g., about 2 mol% to about 5 mol%) of an ethylene-derived component; and about 1 mol% to about 8 mol% (e.g., about 3 mol% to about 5 mol%) of a 1-butene-derived component. Within these ranges, the polyolefin resin composition may exhibit good properties in terms of mechanical properties and plasticity.

[0035] In some embodiments, the propylene-ethylene-1-butene copolymer may have a melting point (Tm) of about 125°C to about 155°C (e.g., about 130°C to about 150°C) as measured using a differential scanning calorimeter (DSC), but is not limited thereto. Within this range, the polyolefin resin composition may have good properties in terms of mechanical properties and plasticity.

[0036] In some embodiments, the propylene-ethylene-1-butene copolymer may have a melt flow index of about 0.1 g / 10 min to about 20 g / 10 min (e.g., about 1 g / 10 min to about 15 g / 10 min) as measured according to ASTM D1238 at 230°C under a load of 2.16 kg. Within this range, the polyolefin resin composition may have good properties in terms of mechanical properties and plasticity.

[0037] In some embodiments, the amount of propylene-ethylene-1-butene copolymer present may be from about 65 wt% to about 90 wt%, for example, from about 70 wt% to about 85 wt%, specifically from about 73 wt% to about 82 wt%, based on the total weight of the base materials including the propylene-ethylene-1-butene copolymer, the ethylene-propylene elastomer, and the propylene-ethylene elastomer. If the content of propylene-ethylene-1-butene copolymer is less than about 65 wt% based on the total weight of the base materials, the polyolefin resin composition may have poor properties in terms of adhesion strength to a polar substrate (such as aluminum), heat resistance, electrolyte resistance, and plasticity. However, if the content of propylene-ethylene-1-butene copolymer exceeds about 90 wt% based on the total weight of the base materials, the polyolefin resin composition may have poor properties in terms of adhesion strength to a polar substrate (such as aluminum), heat resistance, and electrolyte resistance.

[0038] (B) Ethylene-propylene elastomer

[0039] When used in combination with propylene-ethylene-1-butene copolymers, propylene-ethylene elastomers, maleic anhydride-grafted polypropylene and polyethylene resins, the ethylene-propylene elastomers according to one embodiment of the invention are used to improve the properties of polyolefin resin compositions, such as adhesion strength to polar substrates (e.g., aluminum), heat resistance, electrolyte resistance, and plasticity, and may include any ethylene-propylene elastomer used in typical thermoplastic resin compositions.

[0040] In some embodiments, the ethylene-propylene elastomer may include: about 65 wt% to about 85 wt% (e.g., about 70 wt% to about 80 wt%) of an ethylene-derived component; and about 15 wt% to about 35 wt% (e.g., about 20 wt% to about 30 wt%) of a propylene-derived component. Within these ranges, the polyolefin resin composition may exhibit good properties in terms of mechanical properties, plasticity, and adhesion strength to a polar substrate (such as aluminum).

[0041] In one embodiment, the ethylene-propylene elastomer may have a melt flow index of about 0.1 g / 10 min to about 3 g / 10 min (e.g., about 0.5 g / 10 min to about 2 g / 10 min) as measured according to ASTM D1238 at 190°C under a load of 2.16 kg. Within this range, the polyolefin resin composition may exhibit good properties in terms of mechanical properties, plasticity, and adhesion strength to polar substrates (such as aluminum).

[0042] In some embodiments, the amount of ethylene-propylene elastomer present, based on the total weight of the base materials, may be from about 5 wt% to about 15 wt%, for example, from about 7 wt% to about 13 wt%, and for example, from about 8 wt% to about 12 wt%. If the content of ethylene-propylene elastomer is less than about 5 wt% based on the total weight of the base materials, the polyolefin resin composition may have poor properties in terms of adhesion strength to a polar substrate (such as aluminum), heat resistance, and electrolyte resistance. However, if the content of ethylene-propylene elastomer exceeds about 15 wt% based on the total weight of the base materials, the polyolefin resin composition may have poor properties in terms of adhesion strength to a polar substrate (such as aluminum), heat resistance, electrolyte resistance, and plasticity.

[0043] (C) Propylene-ethylene elastomer

[0044] When used in combination with propylene-ethylene-1-butene copolymers, ethylene-propylene elastomers, maleic anhydride-grafted polypropylene and polyethylene resins, the propylene-ethylene elastomers according to one embodiment of the invention are used to improve the properties of polyolefin resin compositions, such as adhesion strength to polar substrates (e.g., aluminum), heat resistance, electrolyte resistance, and plasticity, and may include any propylene-ethylene elastomer used in typical thermoplastic resin compositions.

[0045] In some embodiments, the propylene-ethylene elastomer may include: about 75 wt% to about 95 wt% (e.g., about 85 wt% to about 95 wt%) of a propylene-derived component; and about 5 wt% to about 25 wt% (e.g., about 5 wt% to about 15 wt%) of an ethylene-derived component. Within these ranges, the polyolefin resin composition may exhibit good properties in terms of adhesion strength to polar substrates (such as aluminum) and electrolyte resistance.

[0046] In some embodiments, the propylene-ethylene elastomer may have a melt flow index of about 5 g / 10 min to about 15 g / 10 min (e.g., about 6 g / 10 min to about 10 g / 10 min) measured according to ASTM D1238 at 230°C under a load of 2.16 kg. Within this range, the polyolefin resin composition may exhibit good properties in terms of adhesion strength to polar substrates (such as aluminum), electrolyte resistance, and plasticity.

[0047] In some embodiments, the amount of propylene-ethylene elastomer present, based on the total weight of the base materials, can be from about 5 wt% to about 20 wt%, for example, from about 7 wt% to about 18 wt%, specifically from about 8 wt% to about 17.5 wt%. If the content of propylene-ethylene elastomer is less than about 5 wt% based on the total weight of the base materials, the polyolefin resin composition may have poor properties in terms of adhesion strength to a polar substrate (such as aluminum), heat resistance, and electrolyte resistance. However, if the content of propylene-ethylene elastomer exceeds about 20 wt% based on the total weight of the base materials, the polyolefin resin composition may have poor properties in terms of adhesion strength to a polar substrate (such as aluminum), heat resistance, electrolyte resistance, and plasticity.

[0048] In some embodiments, the weight ratio of ethylene-propylene elastomer to propylene-ethylene elastomer can range from about 1:0.9 to about 1:2, for example, from about 1:1 to about 1:1.9. Within this range, the polyolefin resin composition can exhibit good properties in terms of adhesion strength to polar substrates and electrolyte resistance.

[0049] (D) Maleic anhydride-grafted polypropylene

[0050] When used in combination with propylene-ethylene-1-butene copolymers, propylene-ethylene elastomers, ethylene-propylene elastomers, and polyethylene resins, maleic anhydride-grafted polypropylene according to one embodiment of the present invention is used to improve the properties of polyolefin resin compositions, such as adhesion strength to polar substrates (e.g., aluminum), heat resistance, electrolyte resistance, and plasticity.

[0051] In some embodiments, the maleic anhydride-grafted polypropylene may include about 0.5 wt% to about 5 wt% (e.g., about 1 wt% to about 3 wt%) of a maleic anhydride-derived component. Within this range, the polyolefin resin composition may exhibit good properties such as adhesion strength to a polar substrate (e.g., aluminum).

[0052] In some embodiments, the maleic anhydride-grafted polypropylene, as measured by gel permeation chromatography (GPC), can have a weight-average molecular weight of about 30,000 g / mol to about 60,000 g / mol (e.g., about 40,000 g / mol to about 55,000 g / mol). Within this range, the maleic anhydride-grafted polypropylene can prevent contamination on the adhered material while enhancing the properties of the polyolefin resin composition (such as adhesion strength to polar substrates, such as aluminum).

[0053] In some embodiments, the amount of maleic anhydride-grafted polypropylene present relative to about 100 parts by weight of the base material may be from about 0.1 to about 10 parts by weight, for example, from about 4 to about 8 parts by weight. If the content of maleic anhydride-grafted polypropylene relative to about 100 parts by weight of the base material is less than about 0.1 parts by weight, the polyolefin resin composition may have poor properties in terms of adhesion strength to a polar substrate (such as aluminum), heat resistance, and electrolyte resistance. However, if the content of maleic anhydride-grafted polypropylene relative to about 10 parts by weight of the base material exceeds about 10 parts by weight, the polyolefin resin composition may have poor properties in terms of adhesion strength to a polar substrate (such as aluminum), heat resistance, electrolyte resistance, plasticity, and adhesion uniformity, while also leading to increased contamination of the adhered material.

[0054] (E) Polyethylene resin

[0055] When used in combination with propylene-ethylene-1-butene copolymers, propylene-ethylene elastomers, ethylene-propylene elastomers, and maleic anhydride-grafted polypropylene, the polyethylene resin according to one embodiment of the invention is used to improve the properties of polyolefin resin compositions, such as adhesion strength to polar substrates (e.g., aluminum), heat resistance, electrolyte resistance, and plasticity, and may include any polyethylene resin used in typical thermoplastic resin compositions.

[0056] In some embodiments, the polyethylene resin may include at least one of low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), or high-density polyethylene (HDPE).

[0057] In some embodiments, the polyethylene resin may have a melt flow index of about 1 g / 10 min to about 10 g / 10 min (e.g., about 2 g / 10 min to about 9 g / 10 min) as measured according to ASTM D1238 at 190°C under a load of 2.16 kg. Within this range, the polyolefin resin composition may exhibit good properties in terms of adhesion strength and plasticity to polar substrates (such as aluminum).

[0058] In some embodiments, the amount of polyethylene resin present may be from about 5 to about 15 parts by weight, for example, from about 7 to about 12 parts by weight, based on the total weight of the base materials. If the content of polyethylene resin is less than about 5 parts by weight based on the total weight of the base materials, the polyolefin resin composition may have poor properties in terms of adhesion strength to a polar substrate (such as aluminum), heat resistance, electrolyte resistance, and plasticity. However, if the content of polyethylene resin is more than about 15 parts by weight based on the total weight of the base materials, the polyolefin resin composition may have poor properties in terms of adhesion strength to a polar substrate (such as aluminum), heat resistance, and electrolyte resistance.

[0059] The polyolefin resin composition according to one embodiment of the invention may further include additives typically used in polyolefin resin compositions. Examples of additives may include antioxidants, heat stabilizers, UV stabilizers, flame retardants, anti-dripping agents, lubricants, release agents, nucleating agents, antistatic agents, pigments, dyes, and mixtures thereof. The amount of additive present relative to about 100 parts by weight of the base material may optionally be from about 0.001 to about 40 parts by weight, for example, from about 0.1 to about 10 parts by weight.

[0060] According to one embodiment of the invention, a polyolefin resin composition can be prepared in granular form by mixing the aforementioned components and then melt-extruding them in a typical twin-bar extruder at about 170°C to about 240°C (e.g., about 190°C to about 230°C).

[0061] In one embodiment, the polyolefin resin composition may have an adhesive strength (peel strength) of about 18 N / 15 mm to about 25 N / 15 mm (e.g., about 18.5 N / 15 mm to about 24 N / 15 mm) measured on a sample according to ASTM D1876 (T-peel test) by the following steps: wherein a bilayer film consisting of a layer of polyolefin resin composition and a layer of polypropylene resin is formed by using a multilayer film forming machine, and the bilayer film is attached to an aluminum film with nylon attached, the layer of polyolefin resin composition adjacent to the aluminum film, and the sample is prepared by heating to 200°C and holding for 5 minutes, and wherein the adhesive strength is measured by cutting the sample into 100 mm × 15 mm (length × width) dimensions and peeling the aluminum film and the layer of polypropylene resin at a rate of 50 mm / min.

[0062] In some embodiments, the polyolefin resin composition may have an adhesive strength (peel strength) of about 11 N / 15 mm to about 24 N / 15 mm (e.g., about 13 N / 15 mm to about 22 N / 15 mm) measured on a sample according to ASTM D1876 by the following steps: wherein a bilayer film consisting of a layer of polyolefin resin composition and a layer of polypropylene resin is formed by using a multilayer film forming machine, and the bilayer film is attached to an aluminum film with nylon attached, the layer of polyolefin resin composition adjacent to the aluminum film, and the sample is then heated to 200°C and held for 5 minutes, and wherein the adhesive strength is measured by cutting the sample to a size of 100 mm × 25 mm (length × width), immersing the sample in an organic electrolyte (1 M LiPF6 (EC:DMC:DEC = 1:1:1)) at 85°C for 24 hours, trimming the sides of the sample to prepare a test piece with a length of 100 mm and a width of 15 mm, and peeling the aluminum film and the polypropylene resin layer at a rate of 50 mm / min.

[0063] In some embodiments, the polyolefin resin composition may have a melt flow index of about 0.1 g / 10 min to about 15 g / 10 min (e.g., about 5 g / 10 min to about 12 g / 10 min) as measured according to ASTM D1238 at 230°C under a load of 2.16 kg.

[0064] The molded articles according to the present invention are formed from a polyolefin resin composition. The polyolefin resin composition can be prepared in granular form. The prepared granules can be produced into various molded articles (products) by various molding methods (such as film forming, injection molding, extrusion, vacuum molding, and casting). These molding methods are well known to those skilled in the art to which this invention pertains. Due to their good properties in terms of adhesion strength to polar substrates (such as aluminum), heat resistance, electrolyte resistance, and plasticity, the molded articles are used as adhesive films or adhesive sheets for bonding to polar substrates.

[0065] [Pattern for Invention]

[0066] The invention will now be described in more detail with reference to some embodiments. It should be understood that these embodiments are provided for illustrative purposes only and should not be construed as limiting the invention in any way.

[0067] Example

[0068] Details of the components used in the examples and comparative examples are as follows:

[0069] (A1) Using a propylene-ethylene-1-butene random copolymer (propylene-derived component content: approximately 91 mol; ethylene-derived component content: approximately 4 mol; 1-butene-derived component content: approximately 5 mol; melt flow index (230°C / 2.16 kg): approximately 7 g / 10 min, manufacturer: Lotte Chemical Co., Ltd.).

[0070] (A2) Use polypropylene resin (propylene-ethylene random copolymer; melt flow index (230°C / 2.16kg): approx. 8g / 10min; Lotte Chemical Co., Ltd.).

[0071] (B) Ethylene-propylene elastomer

[0072] Ethylene-propylene elastomer was used (ethylene-derived component content: approximately 75 wt%; melt flow index (190°C / 2.16 kg): approximately 1 g / 10 min; manufacturer: ExxonMobil Co., Ltd.).

[0073] (C) Propylene-ethylene elastomer

[0074] Propylene-ethylene elastomer (propylene-derived component content: approximately 90 wt%; melt flow index (230°C / 2.16 kg): approximately 8 g / 10 min, manufacturer: ExxonMobil Co., Ltd.).

[0075] (D) Maleic anhydride-grafted polypropylene

[0076] Polypropylene grafted with maleic anhydride (maleic anhydride derivative content: approximately 3 wt%; weight average molecular weight: approximately 53,000 g / mol; density: approximately 0.90 g / cm³) 3 Manufacturer: Lotte Chemical Co., Ltd.

[0077] (E) Polyethylene resin

[0078] Low-density polyethylene (LDPE) was used (melt flow index (190°C / 2.16kg): approx. 7g / 10min, manufacturer: Lotte Chemical Co., Ltd.).

[0079] Examples 1 to 4 and Comparative Examples 1 to 7

[0080] The aforementioned components were mixed in the amounts listed in Tables 1 and 2, and then extruded at approximately 190°C to prepare a polyolefin resin composition in granular form. Here, extrusion was performed using a twin-bar extruder (L / D: 40, diameter: 19 mm). The prepared granules were dried at 80°C for 2 hours or longer and then prepared into samples using a multilayer film forming machine. The following properties of the prepared samples were evaluated. The results are shown in Tables 1 and 2.

[0081] Feature evaluation

[0082] (1) Adhesion strength to polar substrate: The adhesion strength (peel strength, unit: N / 15mm) on the sample was measured according to ASTM D1876 (T-type peel test) by the following steps: wherein a double film consisting of a layer of polyolefin resin composition and a layer of polypropylene resin (product name: SFC550, manufacturer: Lotte Chemical Co., Ltd.) was formed by using a multilayer film forming machine, and the double film was attached to an aluminum film (thickness: about 113 µm) with nylon attached, the layer of polyolefin resin composition adjacent to the aluminum film, and the sample was then heated to 200°C and held for 5 minutes, and wherein the adhesion strength was measured by cutting the sample into 100mm × 15mm (length × width) dimensions and peeling the aluminum film and the polypropylene resin layer at a rate of 50mm / min using a universal testing machine (UTM) (model name: Z020, manufacturer: ZwickRoellgmbH).

[0083] Heat and electrolyte resistance: Adhesive strength (peel strength, N / 15 mm) was measured on the sample according to ASTM D1876 (T-type peel test) by the following procedure: a double-layer film consisting of a layer of polyolefin resin composition and a layer of polypropylene resin (product name: SFC550, manufacturer: Lotte Chemical Co., Ltd.) was formed using a multilayer film forming machine, and the double-layer film was attached to an aluminum film (thickness: approximately 113 µm) with a layer of polyolefin resin composition adjacent to the aluminum film. The sample was then heated to 200°C and held for 5 minutes. The adhesive strength was determined by cutting the sample into 100 mm × 25 mm (length × width) dimensions and immersing the sample in an organic electrolyte (1 M LiPF6 (EC:DMC:DEC = 1 M LiPF6) at 85°C. After 24 hours in a 1:1:1 ratio, the two sides of the sample were trimmed to prepare a test piece with a length of 100 mm and a width of 15 mm. The aluminum film and polypropylene resin layers were peeled off using a universal testing machine (UTM) (model name: Z020, manufacturer: ZwickRoellgmbH) at a rate of 50 mm / min to measure.

[0084] (3) Molding processability: The melt flow index (in g / 10 min) was measured for granular samples at 230°C under a load of 2.16 kg according to ASTM D1238.

[0085] (4) Membrane Formability: A bilayer membrane consisting of a layer of polyolefin resin composition and a layer of polypropylene resin (product name: SFC550, manufacturer: Lotte Chemical Co., Ltd.) was prepared using a multilayer membrane forming machine and then cut into 100mm × 100mm (length × width) dimensions. The three membrane samples prepared in this way were then visually inspected for pores on the surface and for wrinkles at the edges. (◎: no pores and / or wrinkles; ○: average number of pores and / or wrinkles is 1 to 2; ×: average number of pores and / or wrinkles is 3 or more)

[0086] Table 1

[0087]

[0088] Parts by weight: Parts by weight relative to 100 parts by weight of base materials (A+B+C)

[0089] Table 2

[0090]

[0091] Parts by weight: Parts by weight relative to 100 parts by weight of base materials (A+B+C)

[0092] As can be seen from the above results, the polyolefin resin composition according to the present invention exhibits good properties in terms of adhesion strength to polar substrates (such as aluminum), heat resistance, electrolyte resistance and plasticity (film forming properties).

[0093] Conversely, it can be seen that, compared with the polyolefin resin compositions of the examples, the polyolefin resin composition of Comparative Example 1, prepared using insufficient amounts of propylene-ethylene-1-butene copolymer and excessive amounts of ethylene-propylene elastomer and propylene-ethylene elastomer, exhibits deterioration in terms of adhesion strength to polar substrates (such as aluminum), heat resistance, and electrolyte resistance, while also displaying poor plasticity (film forming properties); the polyolefin resin composition of Comparative Example 2, prepared using excessive amounts of propylene-ethylene-1-butene copolymer and insufficient amounts of ethylene-propylene elastomer and propylene-ethylene elastomer, exhibits deterioration in terms of adhesion strength to polar substrates (such as aluminum), heat resistance, and electrolyte resistance; and the polyolefin resin composition of Comparative Example 3, prepared using propylene-ethylene random copolymer (A2) instead of the propylene-ethylene-1-butene copolymer according to the present invention, exhibits deterioration in terms of adhesion strength to polar substrates (such as aluminum), heat resistance, and electrolyte resistance. Furthermore, it can be seen that the polyolefin resin composition of Comparative Example 4, prepared using insufficient maleic anhydride-grafted polypropylene, could not adhere to the aluminum film during film formation, making it impossible to measure adhesion strength, heat resistance, or electrolyte resistance. Moreover, compared to the polyolefin resin compositions of the examples, the polyolefin resin composition of Comparative Example 5, prepared using excessive maleic anhydride-grafted polypropylene, exhibited deterioration in adhesion strength, heat resistance, and electrolyte resistance to polar substrates (such as aluminum), while also displaying poor plasticity (film forming properties). Additionally, it can be seen that the polyolefin resin composition of Comparative Example 6, prepared using insufficient polyethylene resin, exhibited poor properties in terms of adhesion strength to polar substrates (such as aluminum), heat resistance, electrolyte resistance, and plasticity (film forming properties); and the polyolefin resin composition of Comparative Example 7, prepared using excessive polyethylene resin, exhibited poor properties in terms of adhesion strength to polar substrates (such as aluminum), heat resistance, and electrolyte resistance.

[0094] Although some embodiments have been described herein, those skilled in the art will understand that various modifications, alterations, and variations can be made without departing from the spirit and scope of the invention. Therefore, it should be understood that these embodiments are provided for illustrative purposes only and should not be construed as limiting the invention in any way. The scope of the invention should be defined by the claims rather than by the foregoing description, and the claims and their equivalents are intended to cover such modifications, etc., falling within the scope of the invention.

Claims

1. A polyolefin resin composition comprising: The base material comprises about 65 wt% to about 90 wt% of propylene-ethylene-1-butene copolymer, about 5 wt% to about 15 wt% of ethylene-propylene elastomer and about 5 wt% to about 20 wt% of propylene-ethylene elastomer; About 0.1 parts by weight to about 10 parts by weight of maleic anhydride-grafted polypropylene; and About 5 parts by weight to about 15 parts by weight of polyethylene resin.

2. The polyolefin resin composition according to claim 1, wherein the propylene-ethylene-1-butene copolymer is a random copolymer of propylene-ethylene-1-butene comprising about 85 mol% to about 98 mol% of a propylene-derived component, about 1 mol% to about 7 mol% of an ethylene-derived component, and about 1 mol% to about 8 mol% of a 1-butene-derived component.

3. The polyolefin resin composition according to claim 1 or 2, wherein the propylene-ethylene-1-butene copolymer has a melt flow index of about 0.1 g / 10 min to about 20 g / 10 min as measured according to ASTM D1238 at 230°C under a load of 2.16 kg.

4. The polyolefin resin composition according to any one of claims 1 to 3, wherein the ethylene-propylene elastomer comprises about 65 wt% to about 85 wt% of an ethylene-derived component and about 15 wt% to about 35 wt% of a propylene-derived component.

5. The polyolefin resin composition according to any one of claims 1 to 4, wherein the ethylene-propylene elastomer has a melt flow index of about 0.1 g / 10 min to about 3 g / 10 min as measured according to ASTM D1238 at 190°C under a load of 2.16 kg.

6. The polyolefin resin composition according to any one of claims 1 to 5, wherein the propylene-ethylene elastomer comprises about 75 wt% to about 95 wt% of a propylene-derived component and about 5 wt% to about 25 wt% of an ethylene-derived component.

7. The polyolefin resin composition according to any one of claims 1 to 6, wherein the propylene-ethylene elastomer has a melt flow index of about 5 g / 10 min to about 15 g / 10 min as measured according to ASTM D1238 at 230°C under a load of 2.16 kg.

8. The polyolefin resin composition according to any one of claims 1 to 7, wherein the maleic anhydride-grafted polypropylene comprises about 0.5 wt% to about 5 wt% of a maleic anhydride-derived component.

9. The polyolefin resin composition according to any one of claims 1 to 8, wherein the polyethylene resin comprises at least one of low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), or high-density polyethylene (HDPE).

10. The polyolefin resin composition according to any one of claims 1 to 9, wherein the weight ratio of the ethylene-propylene elastomer to the propylene-ethylene elastomer ranges from about 1:0.9 to about 1:

2.

11. The polyolefin resin composition according to any one of claims 1 to 10, wherein the polyolefin resin composition has an adhesive strength (peel strength) of about 18 N / 15 mm to about 25 N / 15 mm as measured on a sample according to ASTM D1876 by the following steps: wherein a bilayer film consisting of a layer of the polyolefin resin composition and a layer of polypropylene resin is formed by using a multilayer film forming machine, and the bilayer film is attached to an aluminum film with nylon attached, the layer of the polyolefin resin composition being adjacent to the aluminum film, and the sample is prepared by heating to 200°C and holding for 5 minutes, and wherein the adhesive strength is measured by cutting the sample into 100 mm × 15 mm (length × width) dimensions and peeling the aluminum film and the layer of the polypropylene resin at a rate of 50 mm / min.

12. The polyolefin resin composition according to any one of claims 1 to 11, wherein the polyolefin resin composition has an adhesive strength (peel strength) of about 11 N / 15 mm to about 24 N / 15 mm as measured on a sample according to ASTM D1876 by the following steps: wherein a bilayer film consisting of a layer of the polyolefin resin composition and a layer of polypropylene resin is formed by using a multilayer film forming machine, and the bilayer film is attached to an aluminum film with nylon attached, the layer of the polyolefin resin composition being adjacent to the aluminum film, and the sample is then heated to 200°C and held for 5 minutes, and wherein the adhesive strength is measured by cutting the sample to a size of 100 mm × 25 mm (length × width), immersing the sample in an organic electrolyte (1 M LiPF6 (EC:DMC:DEC = 1:1:1)) at 85°C for 24 hours, trimming both sides of the sample to prepare a test piece having a length of 100 mm and a width of 15 mm, and peeling the aluminum film and the layer of the polypropylene resin at a rate of 50 mm / min.

13. The polyolefin resin composition according to any one of claims 1 to 12, wherein the polyolefin resin composition has a melt flow index of about 0.1 g / 10 min to about 15 g / 10 min as measured according to ASTM D1238 at 230°C under a load of 2.16 kg.

14. A molded article formed from a polyolefin resin composition according to any one of claims 1 to 13.

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