Polyolefin resin composition and molded article produced therefrom

Abstract

A polyolefin resin composition according to the present invention comprises: about 50 wt% to about 80 wt% of a first polypropylene resin having a melting point (Tm) lower than 150°C; about 1 wt% to about 10 wt% of a second polypropylene resin having a melting point (Tm) of 150°C or higher; about 5 wt% to about 20 wt% of a polyethylene resin; about 5 wt% to about 35 wt% of a polyolefin-based elastomer; and about 1 wt% to about 10 wt% of a maleic anhydride-modified polypropylene. The polyolefin resin composition has excellent adhesive strength to a polar substrate, and excellent electrolyte resistance and the like.

Description

Polyolefin resin composition and molded article manufactured therefrom

[0001] The present invention relates to a polyolefin resin composition and a molded article manufactured therefrom. More specifically, the present invention relates to a polyolefin resin composition having excellent adhesive strength to polar substrates, electrolyte resistance, etc., and a molded article manufactured therefrom.

[0002]

[0003] Among polyolefin resins, polypropylene resin boasts excellent rigidity, transparency, and heat resistance, making it widely used as a thermoplastic molding material. Because polypropylene resin is non-polar, it must be acid-modified to achieve adhesion to polar substrates. Furthermore, polypropylene resin lacks flexibility and wettability, preventing it from achieving sufficient adhesion. Therefore, an elastomer component is typically added to polypropylene resin to improve adhesion to polar substrates.

[0004] In this way, when an elastomer component is mixed into an acid-modified polypropylene resin, the adhesion to polar substrates at room temperature can be improved, but there is a problem that the adhesive strength may decrease when left at 80°C or higher after immersing in a battery electrolyte, etc.

[0005] Therefore, there is a need to develop a polyolefin resin composition with excellent adhesive strength and electrolyte resistance to polar substrates at room temperature and high temperature.

[0006] The background technology of the present invention is disclosed in Korean Patent No. 10-1200658, etc.

[0007]

[0008] The purpose of the present invention is to provide a polyolefin resin composition having excellent adhesive strength to polar substrates, electrolyte resistance, etc.

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

[0010] The above and other objects of the present invention can all be achieved by the present invention described below.

[0011]

[0012] 1. One aspect of the present invention relates to a polyolefin resin composition. The polyolefin resin composition comprises about 50 to about 80 wt% of a first polypropylene resin having a melting point (Tm) of less than 150°C; about 1 to about 10 wt% of a second polypropylene resin having a melting point (Tm) of 150°C or higher; about 5 to about 20 wt% of a polyethylene resin; about 5 to about 35 wt% of a polyolefin-based elastomer; and about 1 to about 10 wt% of a maleic anhydride-modified polypropylene.

[0013] 2. In the above 1 specific example, the first polypropylene resin may include at least one of a propylene / ethylene random copolymer and a propylene / ethylene / α-olefin copolymer.

[0014] 3. In the above 1 or 2 specific examples, the first polypropylene resin may be a copolymer having a content of a propylene-derived component of about 85 to about 99 mol%, a content of an ethylene-derived component of about 1 to about 10 mol%, and a content of an α-olefin-derived component of about 0 to about 8 mol%.

[0015] 4. In the above 1 to 3 specific examples, the second polypropylene resin may include at least one of a propylene homopolymer and a propylene / ethylene block copolymer.

[0016] 5. In the above 1 to 4 specific examples, the polyethylene resin may include at least one of low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE).

[0017] 6. In the above 1 to 5 specific examples, the polyolefin-based elastomer may include at least one of an ethylene-propylene elastomer and a propylene-ethylene elastomer.

[0018] 7. In the above 1 to 6 specific examples, the polyolefin-based elastomer may include about 5 to about 15 wt% of ethylene-propylene elastomer and about 20 wt% or less of propylene-ethylene elastomer, based on 100 wt% of the total polyolefin resin composition.

[0019] 8. In the above specific examples 1 to 7, the maleic anhydride modified polypropylene may have a weight average molecular weight of about 30,000 to about 100,000 g / mol, and a maleic anhydride modification ratio of about 1.5 to about 8 wt%.

[0020] 9. In the above 1 to 8 specific examples, the weight ratio of the first polypropylene resin and the second polypropylene resin may be about 1:0.013 to about 1:0.17.

[0021] 10. In the above 1 to 9 specific examples, the polyolefin resin composition is manufactured by using the polyolefin resin composition and the polypropylene resin, manufacturing a two-layer film composed of the polyolefin resin composition and the polypropylene resin with a multilayer film molding machine, laminating the polyolefin resin composition layer of the film manufactured with the multilayer film molding machine on aluminum in the form of a film to which nylon is laminated so that it is in contact, and then heating at 200°C for 5 minutes to manufacture a specimen, and then cutting the specimen into a length of 100 mm and a width of 15 mm, and using a universal testing machine (UTM) to peel the aluminum and polypropylene resin layers at a speed of 50 mm / min, the room temperature adhesive strength is about 18 to about 35 kgf / cm. 2 It could be.

[0022] 11. In the above 1 to 10 specific examples, the polyolefin resin composition is manufactured by using the polyolefin resin composition and the polypropylene resin, manufacturing a two-layer film composed of the polyolefin resin composition and the polypropylene resin with a multilayer film molding machine, laminating the polyolefin resin composition layer of the film manufactured with the multilayer film molding machine on aluminum in the form of a film to which nylon is laminated so that it is in contact, and then heating at 200°C for 5 minutes to manufacture a specimen, and then cutting the specimen to a length of 100 mm and a width of 15 mm, and using a universal testing machine (UTM) at a condition of 80°C to peel the aluminum and polypropylene resin layers at a speed of 50 mm / min, the high-temperature bonding strength measured is about 5.5 to about 12 kgf / cm. 2 It could be.

[0023] 12. In the above 1 to 11 specific examples, the polyolefin resin composition is used to manufacture a two-layer film composed of the polyolefin resin composition and the polypropylene resin using a multilayer film molding machine, and the polyolefin resin composition layer of the film manufactured by the multilayer film molding machine is laminated on aluminum in the form of a film to which nylon is laminated so that it is in contact, and then heated at 200°C for 5 minutes to manufacture a specimen, and then the specimen is cut to a length of 100 mm and a width of 25 mm, and the cut specimen is immersed in a lithium secondary battery electrolyte at 85°C for 24 hours, and then both sides of the specimen are cut to a length of 100 mm and a width of 15 mm. The specimen manufactured by peeling the aluminum and polypropylene resin layers at a speed of 50 mm / min using a universal testing machine (UTM), and the adhesive strength after immersion in the electrolyte is about 13 to about 20 kgf / cm. 2 It could be.

[0024] 13. Another aspect of the present invention relates to a molded article. The molded article is characterized in that it is formed from a polyolefin resin composition according to any one of 1 to 12.

[0025] 14. Another aspect of the present invention relates to a laminate for a battery. The laminate for a battery comprises: a barrier layer including a polar substrate; and a sealant layer adhered to at least one surface of the barrier layer; wherein the sealant layer is formed from a polyolefin resin composition according to any one of 1 to 12.

[0026]

[0027] The present invention has the effect of providing a polyolefin resin composition having excellent adhesive strength to a polar substrate, electrolyte resistance, etc., and a molded article formed therefrom.

[0028]

[0029] Hereinafter, the present invention will be described in detail as follows.

[0030] A polyolefin resin composition according to the present invention comprises (A) a first polypropylene resin having a melting point (Tm) of less than 150°C; (B) a second polypropylene resin having a melting point (Tm) of 150°C or higher; (C) a polyethylene resin; (D) a polyolefin-based elastomer; and (E) maleic anhydride-modified polypropylene.

[0031] In this specification, “a to b” indicating a numerical range is defined as “≥a and ≤b”.

[0032]

[0033] (A) First polypropylene resin

[0034] According to one specific example of the present invention, the first polypropylene resin can be applied together with a second polypropylene resin having a melting point (Tm) of 150°C or higher, a polyethylene resin, a polyolefin-based elastomer, a maleic anhydride-modified polypropylene, etc., to improve the adhesive strength (at room temperature and high temperature) and electrolyte resistance of the polyolefin resin composition to a polar substrate, and a polypropylene resin having a melting point (Tm) of less than 150°C can be used.

[0035] In a specific example, the first polypropylene resin may have a melting point (Tm) of less than 150°C, for example, from about 120°C to about 145°C. When the melting point of the first polypropylene resin is 150°C or higher, there is a concern that the adhesive strength of the polyolefin resin composition to a polar substrate may be reduced.

[0036] In a specific example, the first polypropylene resin may include at least one of a propylene / ethylene random copolymer and a propylene / ethylene / α-olefin copolymer.

[0037] In a specific example, the first polypropylene resin may have a content of a propylene-derived component of about 85 to about 99 mol%, for example, about 90 to about 98 mol%, an ethylene-derived component of about 1 to about 10 mol%, for example, about 2 to about 5 mol%, and an α-olefin-derived component of about 0 to about 8 mol%, for example, about 0 to about 5 mol%. Here, when the content of the α-olefin-derived component is 0 mol%, the polypropylene copolymer resin is a propylene / ethylene random copolymer. Within the above range, the polyolefin resin composition may have excellent processability, film formability, etc.

[0038] In a specific example, the first polypropylene resin may have a melt flow index (MI) of about 2 to about 15 g / 10 min, for example, about 5 to about 12 g / 10 min, measured under conditions of 230°C and 2.16 kg according to ASTM D1238. Within this range, the polyolefin resin composition may have excellent processability, film formability, etc.

[0039] In a specific example, the first polypropylene resin may be included in an amount of about 50 to about 80 wt%, for example, about 55 to about 75 wt%, and specifically about 57 to about 74 wt%, of the total polyolefin resin composition of 100 wt%. If the content of the first polypropylene resin is outside the above range, there is a concern that the mechanical properties, processability, etc. of the polyolefin resin composition may deteriorate.

[0040]

[0041] (B) Second polypropylene resin

[0042] The second polypropylene resin according to one specific example of the present invention can be applied together with the first polypropylene resin, polyethylene resin, polyolefin-based elastomer, maleic anhydride-modified polypropylene, etc., to improve the adhesive strength (at room temperature and high temperature) and electrolyte resistance of the polyolefin resin composition to a polar substrate, and a polypropylene resin having a melting point (Tm) of 150°C or higher can be used.

[0043] In a specific example, the second polypropylene resin may have a melting point (Tm) of 150°C or higher, for example, about 155 to about 170°C. If the melting point of the second polypropylene resin is lower than 150°C, there is a concern that the adhesive strength of the polyolefin resin composition to a polar substrate may be reduced.

[0044] In a specific example, the second polypropylene resin may include at least one of a propylene homopolymer (homopolypropylene resin) and a propylene / ethylene block copolymer (block polypropylene resin). Here, the propylene / ethylene block copolymer (block polypropylene resin) may be a block polypropylene resin composed of a homopolypropylene block and an ethylene-propylene copolymer block and / or a homopolyethylene block.

[0045] In a specific example, the second polypropylene resin may have a melt flow index (MI) of about 1 to about 30 g / 10 min, for example, about 5 to about 15 g / 10 min, measured under conditions of 230°C and 2.16 kg according to ASTM D1238. Within this range, the film formability of the polyolefin resin composition, adhesion strength to a polar substrate, etc. may be excellent.

[0046] In a specific example, the second polypropylene resin may be included in an amount of about 1 to about 10 wt%, for example, about 2 to about 8 wt%, and specifically about 3 to about 6 wt%, based on 100 wt% of the total polyolefin resin composition. If the content of the second polypropylene resin is outside the above range, there is a concern that the adhesive strength, electrolyte resistance, mechanical properties, processability, etc. of the polyolefin resin composition to polar substrates at room temperature and high temperature may deteriorate.

[0047] In a specific example, the weight ratio of the first polypropylene resin and the second polypropylene resin (first polypropylene resin: second polypropylene resin) may be from about 1:0.013 to about 1:0.17, for example from about 1:0.02 to about 1:0.15. In this range, the mechanical properties, processability, and adhesive strength to a polar substrate of the polyolefin resin composition may be more excellent.

[0048]

[0049] (C) polyethylene resin

[0050] According to one specific example of the present invention, a polyethylene resin can be applied together with the first and second polypropylene resins, polyolefin-based elastomers, and maleic anhydride-modified polypropylene, etc., to improve the adhesive strength (at room temperature and high temperature) and electrolyte resistance of the polyolefin resin composition to a polar substrate, and a polyethylene resin used in a typical thermoplastic resin composition can be used.

[0051] In a specific example, the polyethylene resin may include one or more of low-density polyethylene (LDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), and linear low-density polyethylene (LLDPE). For example, the polyethylene resin may be low-density polyethylene (LDPE) and / or linear low-density polyethylene (LLDPE).

[0052] In a specific example, the polyethylene resin may have a melt flow index (MI) of about 0.5 to about 15 g / 10 min, for example, about 1 to about 10 g / 10 min, measured under conditions of 190°C and 2.16 kg according to ASTM D1238. Within this range, the film formability, etc. of the polyolefin resin composition may be excellent.

[0053] In a specific example, the polyethylene resin may be included in an amount of about 5 to about 20 wt%, for example, about 6 to about 15 wt%, specifically about 7 to about 12 wt%, based on 100 wt% of the total polyolefin resin composition. When the content of the polyethylene resin is less than about 5 wt%, based on 100 wt% of the total polyolefin resin composition, there is a concern that the adhesive strength to polar substrates at room temperature and high temperature, electrolyte resistance, film formability, etc. of the polyolefin resin composition may be reduced, and when it exceeds about 20 wt%, there is a concern that the mechanical properties, etc. of the polyolefin resin composition may be reduced.

[0054]

[0055] (D) Polyolefin elastomer

[0056] A polyolefin-based elastomer according to one specific example of the present invention can be applied together with the first and second polypropylene resins, polyethylene resins, maleic anhydride-modified polypropylene, etc., to improve the adhesive strength (at room temperature and high temperature) and electrolyte resistance of the polyolefin resin composition to a polar substrate, and a polyolefin-based elastomer used in a typical thermoplastic resin composition can be used.

[0057] In a specific example, the polyolefin-based elastomer may include at least one of an ethylene-propylene elastomer and a propylene-ethylene elastomer, and for example, an ethylene-propylene elastomer may be applied alone, or an ethylene-propylene elastomer and a propylene-ethylene elastomer may be applied in combination.

[0058] In a specific example, the polyolefin-based elastomer may include about 5 to about 15 wt% of ethylene-propylene elastomer and about 20 wt% or less of propylene-ethylene elastomer, based on 100 wt% of the total polyolefin resin composition.

[0059] In a specific example, the polyolefin elastomer may have a melt flow index (MI) of about 0.1 to about 20 g / 10 min, for example, about 0.5 to about 15 g / 10 min, measured under conditions of 230°C and 2.16 kg according to ASTM D1238. Within this range, the wettability, mechanical properties, etc. of the polyolefin resin composition may be excellent.

[0060] In a specific example, the polyolefin-based elastomer may be included in an amount of about 5 to about 35 wt%, for example, about 7 to about 30 wt%, specifically about 10 to about 25 wt%, based on 100 wt% of the total polyolefin resin composition. When the content of the polyolefin-based elastomer is less than about 5 wt%, based on 100 wt% of the total polyolefin resin composition, there is a concern that the adhesive strength to a polar substrate, electrolyte resistance, etc. of the polyolefin resin composition may be reduced, and when it exceeds about 35 wt%, there is a concern that the film formability, etc. of the polyolefin resin composition may be reduced.

[0061]

[0062] (E) Maleic anhydride modified polypropylene

[0063] According to one specific example of the present invention, maleic anhydride-modified polypropylene can be applied together with the first and second polypropylene resins, polyethylene resins, and polyolefin-based elastomers, etc., to improve the adhesive strength (at room temperature and high temperature) and electrolyte resistance of the polyolefin resin composition to a polar substrate, and maleic anhydride-modified polypropylene used in a typical thermoplastic resin composition can be used.

[0064] In a specific example, the maleic anhydride-modified polypropylene may have a weight average molecular weight measured by gel permeation chromatography (GPC) of about 30,000 to about 100,000 g / mol, for example, about 40,000 to about 80,000 g / mol. Within this range, the polyolefin resin composition may have excellent adhesive strength to a polar substrate, electrolyte resistance, and the like.

[0065] In a specific example, the maleic anhydride-modified polypropylene may have a maleic anhydride modification ratio of about 1.5 to about 8 wt%, for example, about 1.7 to about 6 wt%. Within this range, the polyolefin resin composition may exhibit excellent adhesive strength to a polar substrate, electrolyte resistance, and the like.

[0066] In a specific example, the maleic anhydride-modified polypropylene may be included in an amount of about 1 to about 10 wt%, for example, about 2 to about 8 wt%, based on 100 wt% of the total polyolefin resin composition. When the content of the maleic anhydride-modified polypropylene is less than about 1 wt%, based on 100 wt% of the total polyolefin resin composition, there is a concern that the adhesive strength to a polar substrate, electrolyte resistance, etc. of the polyolefin resin composition may be reduced, and when it exceeds about 10 wt%, there is a concern that the mechanical properties, processability, etc. of the polyolefin resin composition may be reduced.

[0067]

[0068] A polyolefin resin composition according to one specific embodiment of the present invention may further include additives included in conventional polyolefin resin compositions. Examples of the additives include, but are not limited to, antioxidants, stabilizers, flame retardants, anti-drip agents, lubricants, release agents, nucleating agents, antistatic agents, stabilizers, pigments, dyes, and mixtures thereof. When the additives are used, the content thereof may be about 0.001 to about 20 wt%, for example, about 0.1 to about 10 wt%, based on 100 wt% of the total polyolefin resin composition, but is not limited thereto.

[0069]

[0070] A polyolefin resin composition according to one specific example of the present invention may be in the form of pellets obtained by mixing the above components and melt-extruding them at about 150 to about 230°C, for example, about 170 to about 210°C, using a conventional twin-screw extruder.

[0071] In a specific example, the polyolefin resin composition is manufactured by using the polyolefin resin composition and the polypropylene resin, manufacturing a two-layer film composed of the polyolefin resin composition and the polypropylene resin with a multilayer film molding machine, laminating the polyolefin resin composition layer of the film manufactured with the multilayer film molding machine on aluminum in the form of a film to which nylon is laminated so that it is in contact, and then heating at 200°C for 5 minutes to manufacture a specimen, and then cutting the specimen into a length of 100 mm and a width of 15 mm, and using a universal testing machine (UTM) to peel the aluminum and polypropylene resin layers at a speed of 50 mm / min, the room temperature adhesive strength is about 18 to about 35 kgf / cm. 2 , for example, about 20 to about 30 kgf / cm 2 It could be.

[0072] In a specific example, the polyolefin resin composition is manufactured by using the polyolefin resin composition and the polypropylene resin, manufacturing a two-layer film composed of the polyolefin resin composition and the polypropylene resin with a multilayer film molding machine, laminating the polyolefin resin composition layer of the film manufactured with the multilayer film molding machine on aluminum in the form of a film to which nylon is laminated so that it is in contact, and then heating at 200°C for 5 minutes to manufacture a specimen, and then cutting the specimen to a length of 100 mm and a width of 15 mm, and using a universal testing machine (UTM) at 80°C to peel the aluminum and polypropylene resin layers at a speed of 50 mm / min, and the high-temperature bonding strength measured is about 5.5 to about 12 kgf / cm. 2 , for example, about 6 to about 10 kgf / cm 2 It could be.

[0073] In a specific example, the polyolefin resin composition is manufactured by using the polyolefin resin composition and the polypropylene resin, manufacturing a two-layer film composed of the polyolefin resin composition and the polypropylene resin with a multilayer film molding machine, laminating the polyolefin resin composition layer of the film manufactured with the multilayer film molding machine on aluminum in the form of a film to which nylon is laminated so that it is in contact, and then heating at 200°C for 5 minutes to manufacture a specimen, and then cutting the specimen to a length of 100 mm and a width of 25 mm, and immersing the cut specimen in a lithium secondary battery electrolyte at 85°C for 24 hours, and then cutting both sides of the specimen to a length of 100 mm and a width of 15 mm, and measuring the adhesive strength after electrolyte immersion while peeling the aluminum and polypropylene resin layers at a speed of 50 mm / min using a universal testing machine (UTM), and measuring the adhesive strength is about 13 to about 20 kgf / cm 2 , for example, about 13.5 to about 18 kgf / cm 2 It could be.

[0074]

[0075] A molded article according to one specific example of the present invention is formed from the polyolefin resin composition. The polyolefin resin composition can be manufactured in the form of pellets, and the manufactured pellets can be manufactured into various molded articles (products) through various molding methods such as injection molding, extrusion molding, vacuum molding, and casting molding. Such molding methods are well known to those skilled in the art to which the present invention pertains. The molded article has excellent adhesive strength and electrolyte resistance to polar substrates at room temperature and high temperature, and is useful as an adhesive film, adhesive sheet, etc. for bonding to polar substrates (aluminum, steel, ethylene vinyl alcohol (EVOH), polyamide, etc.). For example, it is useful as a film for food containers, a sealant layer for a laminate for batteries, etc.

[0076] In a specific example, the battery laminate may include a barrier layer including a polar substrate; and a sealant layer adhered to at least one surface of the barrier layer. Here, the sealant layer may be in the form of an adhesive film formed from the polyolefin resin composition.

[0077]

[0078] Hereinafter, the present invention will be described in more detail through examples; however, these examples are for the purpose of explanation only and should not be construed as limiting the present invention.

[0079]

[0080] Example

[0081] Below, the specifications of each component used in the examples and comparative examples are as follows.

[0082] (A) First polypropylene resin

[0083] Random polypropylene resin (propylene-ethylene-1-butene terpolymer, manufacturer: Lotte Chemical, product name: SFC-750, melting point (Tm): approximately 132°C) was used.

[0084] (B) Second polypropylene resin

[0085] (B1) Homopolypropylene resin (propylene homopolymer, manufacturer: Lotte Chemical, product name: J-150H, melting point (Tm): approximately 169°C) was used.

[0086] (B2) Block polypropylene resin (propylene / ethylene block copolymer, manufacturer: Lotte Chemical, product name: J-350, melting point (Tm): approximately 167°C) was used.

[0087] (C) polyethylene resin

[0088] Polyethylene resin (low-density polyethylene (LDPE), manufacturer: Lotte Chemical, product name: XL-610S) was used.

[0089] (D) Polyolefin elastomer

[0090] (D1) Ethylene-propylene elastomer (Manufacturer: ExxonMobil, Product name: Vistalon 722) was used.

[0091] (D2) Propylene-ethylene elastomer (Manufacturer: ExxonMobil, Product name: Vistamaxx 3980FL) was used.

[0092] (E) Maleic anhydride modified polypropylene

[0093] Maleic anhydride-modified polypropylene (weight average molecular weight: approximately 49,000 g / mol, maleic anhydride modification ratio: approximately 2 wt%) was used.

[0094]

[0095] Examples 1 to 4 and Comparative Examples 1 to 4

[0096] After adding each of the above components in the amounts described in Tables 1 and 2 below, pellets were manufactured by extrusion at a barrel temperature of approximately 170°C. The extrusion was performed using a twin-screw extruder with an L / D of 40 and a diameter of 19 mm, and the manufactured pellets were dried at approximately 80°C for approximately 4 hours or more, and then specimens were manufactured using a multilayer film molding machine according to the method for measuring physical properties described below. The physical properties of the manufactured specimens were evaluated using the following method, and the results are shown in Tables 1 and 2 below.

[0097]

[0098] Method of measuring physical properties

[0099] (1) Room temperature bonding strength (peel strength, unit: kgf / cm) 2 ): Using the polyolefin resin composition and polypropylene resin (manufacturer: Lotte Chemical, product name: L-860C), a two-layer film composed of the polyolefin resin composition and the polypropylene resin was manufactured using a multilayer film molding machine, and the polyolefin resin composition layer among the films manufactured using the multilayer film molding machine was laminated on top of aluminum (thickness: approximately 113 μm) in the form of a film to which nylon was laminated so that it was in contact, and then heated at 200°C for 5 minutes to manufacture a specimen, and then the specimen was cut into 100 mm in length and 15 mm in width, and the adhesive strength was measured by peeling the aluminum and polypropylene resin layers at a speed of 50 mm / min using a universal testing machine (UTM, manufacturer: ZwickRoell, device name: Z020).

[0100] (2) High temperature bonding strength (peel strength, unit: kgf / cm) 2): Using the polyolefin resin composition and polypropylene resin (manufacturer: Lotte Chemical, product name: L-860C), a two-layer film composed of the polyolefin resin composition and the polypropylene resin was manufactured using a multilayer film molding machine, and the polyolefin resin composition layer among the films manufactured using the multilayer film molding machine was laminated on top of aluminum (thickness: approximately 113 μm) in the form of a film to which nylon was laminated so that it was in contact, and then heated at 200°C for 5 minutes to manufacture a specimen, and then the specimen was cut to 100 mm in length and 15 mm in width, and the cut specimen was measured for adhesive strength by peeling the aluminum and polypropylene resin layers at a speed of 50 mm / min using a universal testing machine (UTM, manufacturer: ZwickRoell, device name: Z020) under conditions of 80°C.

[0101] (3) Adhesive strength after immersion in electrolyte (electrolyte resistance, peel strength, unit: kgf / cm) 2): Using the above polyolefin resin composition and polypropylene resin (manufacturer: Lotte Chemical, product name: L-860C), a two-layer film composed of the polyolefin resin composition and the polypropylene resin was manufactured using a multilayer film molding machine, and the polyolefin resin composition layer among the films manufactured using the multilayer film molding machine was laminated on aluminum (thickness: about 113 μm) in the form of a film to which nylon was laminated so that it was in contact, and then heated at 200°C for 5 minutes to manufacture a specimen, and then the specimen was cut into 100 mm in length and 25 mm in width, and the cut specimen was immersed in a lithium secondary battery electrolyte at 85°C in which lithium salt (LiPF6) was dissolved at a concentration of 1 M in a solvent in which ethylene carbonate (EC): dimethyl carbonate (DMC): diethyl carbonate (DEC) was mixed at a volume ratio of about 1: 1: 1 for 24 hours, and then both sides of the specimen were cut and the length The adhesive strength was measured by peeling the aluminum and polypropylene resin layers at a speed of 50 mm / min using a universal testing machine (UTM, manufacturer: ZwickRoell, device name: Z020) on a specimen manufactured to be 100 mm long and 15 mm wide.

[0102]

[0103] Example 1234(A) (weight%) 59575974(B1) (weight%) 35-3(B2) (weight%)--3-(C) (weight%) 8888(D1) (weight%) 10101010(D2) (weight%) 151515-(E) (weight%) 5555Room temperature adhesive strength 25.523.026.820.1High temperature adhesive strength 7.88.28.56.8Adhesive strength after electrolyte immersion 15.515.316.813.7

[0104]

[0105] Comparative Example 1234(A) (Wt%)62677277(B1) (Wt%)-3--(B2) (Wt%)----(C) (Wt%)8-88(D1) (Wt%)1010-10(D2) (Wt%)151515-(E) (Wt%)5555Room temperature adhesive strength21.514.57.68.5High temperature adhesive strength4.85.02.03.3Adhesive strength after electrolyte immersion12.25.81.62.6

[0106]

[0107] From the above results, it can be seen that the polyolefin resin composition of the present invention is excellent in both adhesive strength to polar substrates at room temperature and high temperature (room temperature adhesive strength and high temperature adhesive strength), electrolyte resistance (adhesive strength after immersion in electrolyte solution), etc.

[0108] On the other hand, in the case of Comparative Examples 1, 3, and 4, where the second polypropylene resin was not applied, there is a concern that the adhesive strength and electrolyte resistance to polar substrates at high temperatures may decrease, and in the case of Comparative Examples 3 and 4, it can be seen that the adhesive strength to polar substrates at room temperature also decreases. In addition, in the case of Comparative Example 2, where the polyethylene resin was not applied, there is a concern that the adhesive strength and electrolyte resistance to polar substrates at room and high temperatures may decrease.

[0109]

[0110] The present invention has been described with reference to exemplary embodiments. Those skilled in the art will appreciate that the present invention can be implemented in modified forms without departing from its essential characteristics. Therefore, the disclosed embodiments should be considered illustrative rather than limiting. The scope of the present invention is set forth in the claims, not the foregoing description, and all differences within the scope equivalent thereto should be construed as being encompassed by the present invention.

Claims

1. About 50 to about 80 wt% of a first polypropylene resin having a melting point (Tm) of less than 150°C; About 1 to about 10 wt% of a second polypropylene resin having a melting point (Tm) of 150°C or higher; About 5 to about 20 wt% of polyethylene resin; About 5 to about 35 wt% of a polyolefin elastomer; and A polyolefin resin composition comprising about 1 to about 10 wt% of maleic anhydride modified polypropylene.

2. A polyolefin resin composition according to claim 1, characterized in that the first polypropylene resin comprises at least one of a propylene / ethylene random copolymer and a propylene / ethylene / α-olefin copolymer.

3. A polyolefin resin composition according to claim 1 or 2, characterized in that the first polypropylene resin is a copolymer having a content of a propylene-derived component of about 85 to about 99 mol%, a content of an ethylene-derived component of about 1 to about 10 mol%, and a content of an α-olefin-derived component of about 0 to about 8 mol%.

4. A polyolefin resin composition according to any one of claims 1 to 3, wherein the second polypropylene resin comprises at least one of a propylene homopolymer and a propylene / ethylene block copolymer.

5. A polyolefin resin composition according to any one of claims 1 to 4, characterized in that the polyethylene resin comprises at least one of low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE).

6. A polyolefin resin composition according to any one of claims 1 to 5, wherein the polyolefin-based elastomer comprises at least one of an ethylene-propylene elastomer and a propylene-ethylene elastomer.

7. A polyolefin resin composition according to any one of claims 1 to 6, characterized in that the polyolefin-based elastomer comprises about 5 to about 15 wt% of ethylene-propylene elastomer and about 20 wt% or less of propylene-ethylene elastomer, based on 100 wt% of the total polyolefin resin composition.

8. A polyolefin resin composition according to any one of claims 1 to 7, wherein the maleic anhydride-modified polypropylene has a weight average molecular weight of about 30,000 to about 100,000 g / mol and a maleic anhydride modification ratio of about 1.5 to about 8 wt%.

9. A polyolefin resin composition according to any one of claims 1 to 8, wherein the weight ratio of the first polypropylene resin and the second polypropylene resin is about 1:0.013 to about 1:0.

17.

10. In any one of claims 1 to 9, the polyolefin resin composition is manufactured by using the polyolefin resin composition and the polypropylene resin to manufacture a two-layer film composed of the polyolefin resin composition and the polypropylene resin with a multilayer film molding machine, and the polyolefin resin composition layer of the film manufactured with the multilayer film molding machine is laminated on aluminum in the form of a film to which nylon is laminated so that it is in contact, and then heating at 200°C for 5 minutes to manufacture a specimen, and then the specimen is cut into 100 mm in length and 15 mm in width, and the room temperature adhesive strength measured while peeling the aluminum and polypropylene resin layers at a speed of 50 mm / min using a universal testing machine (UTM) is about 18 to about 35 kgf / cm. 2 A polyolefin resin composition characterized by:

11. In any one of claims 1 to 10, the polyolefin resin composition is manufactured by using the polyolefin resin composition and the polypropylene resin, manufacturing a two-layer film composed of the polyolefin resin composition and the polypropylene resin with a multilayer film molding machine, laminating the polyolefin resin composition layer of the film manufactured with the multilayer film molding machine on aluminum in the form of a film to which nylon is laminated so that it is in contact, and then heating at 200°C for 5 minutes to manufacture a specimen, and then cutting the specimen to a length of 100 mm and a width of 15 mm, and using a universal testing machine (UTM) at a condition of 80°C to peel the aluminum and polypropylene resin layers at a speed of 50 mm / min, the high-temperature bonding strength measured is about 5.5 to about 12 kgf / cm. 2 A polyolefin resin composition characterized by:

12. In any one of claims 1 to 11, the polyolefin resin composition is manufactured by using the polyolefin resin composition and the polypropylene resin, manufacturing a two-layer film composed of the polyolefin resin composition and the polypropylene resin with a multilayer film molding machine, laminating the polyolefin resin composition layer of the film manufactured with the multilayer film molding machine on aluminum in the form of a film to which nylon is laminated so that it is in contact, and then heating at 200°C for 5 minutes to manufacture a specimen, and then cutting the specimen to a length of 100 mm and a width of 25 mm, and immersing the cut specimen in a lithium secondary battery electrolyte at 85°C for 24 hours, and then cutting both sides of the specimen to a length of 100 mm and a width of 15 mm, and measuring the adhesive strength after immersion in the electrolyte while peeling the aluminum and the polypropylene resin layers at a speed of 50 mm / min using a universal testing machine (UTM), the adhesive strength is about 13 to about 20 kgf / cm 2 A polyolefin resin composition characterized by:

13. A molded product characterized by being formed from a polyolefin resin composition according to any one of claims 1 to 12.

14. A barrier layer including a polar substrate; and A sealant layer adhered to at least one surface of the barrier layer; A battery laminate, characterized in that the sealant layer is formed from a polyolefin resin composition according to any one of claims 1 to 12.