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KR-20260064847-A - POLYOLEFIN RESIN COMPOSITION AND ARTICLE PRODUCED THEREFROM

KR20260064847AKR 20260064847 AKR20260064847 AKR 20260064847AKR-20260064847-A

Abstract

The polyolefin resin composition of the present invention is characterized by comprising 35 to 55 weight% of random polypropylene resin; 10 to 35 weight% of propylene-ethylene-1-butene copolymer; 1 to 15 weight% of ethylene-propylene elastomer; 5 to 25 weight% of propylene-ethylene elastomer; and 1 to 15 weight% of maleic anhydride grafted polypropylene. The polyolefin resin composition has excellent adhesion strength to polar substrates, adhesion strength to polar substrates after high-temperature thermal history, etc.

Inventors

  • 이준희
  • 홍상현
  • 반균하

Assignees

  • 롯데케미칼 주식회사

Dates

Publication Date
20260508
Application Date
20241029

Claims (15)

  1. 35 to 55 weight% of random polypropylene resin; 10 to 35 weight% of propylene-ethylene-1-butene copolymer; 1 to 15 weight% of ethylene-propylene elastomer; 5 to 25 weight% of propylene-ethylene elastomer; and A polyolefin resin composition characterized by comprising 1 to 15 weight% of maleic anhydride grafted polypropylene.
  2. A polyolefin resin composition according to claim 1, wherein the random polypropylene resin is a propylene-ethylene random copolymer having a propylene-derived component content of 90 to 99 mol% and an ethylene-derived component content of 1 to 10 mol%, and has a melt flow index of 0.1 to 4.5 g/10 min measured at 230°C and 2.16 kg in accordance with ASTM D1238.
  3. A polyolefin resin composition according to claim 1, wherein the propylene-ethylene-1-butene copolymer is a random copolymer having a propylene-derived component content of 85 to 98 mol%, an ethylene-derived component content of 1 to 7 mol%, and a 1-butene-derived component content of 1 to 8 mol%, and a melt flow index of 0.1 to 20 g/10 min measured at 230°C and 2.16 kg in accordance with ASTM D1238.
  4. A polyolefin resin composition according to claim 1, characterized in that the weight ratio of the random polypropylene resin and the propylene-ethylene-1-butene copolymer is 1:0.2 to 1:0.7.
  5. A polyolefin resin composition according to claim 1, wherein the ethylene-propylene elastomer has an ethylene-derived component content of 65 to 85 weight% and a propylene-derived component content of 15 to 35 weight%, and a melt flow index of 0.1 to 3 g/10 min measured at 190°C and 2.16 kg in accordance with ASTM D1238.
  6. A polyolefin resin composition according to claim 1, wherein the propylene-ethylene elastomer has a propylene-derived component content of 75 to 95 weight% and an ethylene-derived component content of 5 to 25 weight%, and a melt flow index of 5 to 15 g/10 min measured at 230°C and 2.16 kg in accordance with ASTM D1238.
  7. A polyolefin resin composition according to claim 1, characterized in that the maleic anhydride grafted polypropylene has a maleic anhydride-derived component content of 0.5 to 5 weight%.
  8. A polyolefin resin composition according to claim 1, characterized in that the polyolefin resin composition further comprises 0.5 to 10 weight% of homopolypropylene resin.
  9. A polyolefin resin composition according to claim 1, characterized in that the polyolefin resin composition further comprises 1 to 15 weight percent of polyethylene resin.
  10. The polyolefin resin composition according to claim 1, wherein 2 g of the polyolefin resin composition is placed between aluminum sheets with a thickness of 200 μm, and heat-pressed for 60 seconds under conditions of a temperature of 190°C and a pressure of 100 kgf/ cm² to produce a specimen with a length of 100 mm and a width of 20 mm, and then the adhesion strength (peel strength) measured by peeling the aluminum sheet layer and the polyolefin resin composition layer at a speed of 100 mm/min according to ASTM D1876 (T-Peel test) is 8 to 10 kgf/20 mm.
  11. The polyolefin resin composition according to claim 1, wherein the polyolefin resin composition uses polypropylene resin as the outer and inner layers, uses an ethylene-vinyl alcohol copolymer as the barrier layer, and uses the polyolefin resin composition as the adhesive layer, and manufactures a five-layer film specimen consisting of an inner layer with a thickness of 360 μm, an adhesive layer with a thickness of 20 μm, a barrier layer with a thickness of 40 μm, an adhesive layer with a thickness of 20 μm, and an outer layer with a thickness of 360 μm using a co-extrusion multilayer film molding machine, and after cutting the specimen to a length of 100 mm and a width of 15 mm, the adhesive strength (peel strength) measured by peeling the barrier layer and the adhesive layer at a speed of 50 mm/min according to ASTM D1876 (T-Peel test) is 2.5 to 4 kgf/15 mm.
  12. The polyolefin resin composition according to claim 1, wherein the polyolefin resin composition uses polypropylene resin as the outer and inner layers, uses an ethylene-vinyl alcohol copolymer as the barrier layer, and uses the polyolefin resin composition as the adhesive layer, and manufactures a five-layer film specimen consisting of an inner layer with a thickness of 360 μm, an adhesive layer with a thickness of 20 μm, a barrier layer with a thickness of 40 μm, an adhesive layer with a thickness of 20 μm, and an outer layer with a thickness of 360 μm using a co-extrusion multilayer film molding machine, cut the specimen to a length of 100 mm and a width of 15 mm, store it in a hot air oven at 150°C for 30 minutes, and then, according to ASTM D1876 (T-Peel test), peel the barrier layer and the adhesive layer at a speed of 50 mm/min, and the adhesive strength (peel strength) measured is 2 to 4 kgf/15 mm.
  13. The polyolefin resin composition according to claim 1, wherein the polyolefin resin composition uses polypropylene resin as the outer and inner layers, uses an ethylene-vinyl alcohol copolymer as the barrier layer, and uses the polyolefin resin composition as the adhesive layer, and manufactures a five-layer film specimen consisting of an inner layer with a thickness of 360 μm, an adhesive layer with a thickness of 20 μm, a barrier layer with a thickness of 40 μm, an adhesive layer with a thickness of 20 μm, and an outer layer with a thickness of 360 μm using a co-extrusion multilayer film molding machine, cut the specimen to a length of 100 mm and a width of 15 mm, places it in a 1,000 W microwave oven and exposes it to microwaves for 1 minute and 30 seconds, and then peels the barrier layer and the adhesive layer at a speed of 50 mm/min according to ASTM D1876 (T-Peel test), and the adhesive strength (peel strength) measured is 2 to 4 kgf/15 mm.
  14. The polyolefin resin composition according to claim 1, characterized in that the polyolefin resin composition has a melt flow index of 0.1 to 15 g/10 min measured at 230°C and 2.16 kg in accordance with ASTM D1238.
  15. A molded article characterized by being formed from a polyolefin resin composition according to any one of claims 1 to 14.

Description

Polyolefin resin composition and molded article produced therefrom 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 adhesion strength to a polar substrate, adhesion strength to a polar substrate after high-temperature thermal history, and a molded article manufactured therefrom. Multilayer laminated packaging materials are widely used for packaging contents where quality preservation is critical, such as food, pharmaceuticals, and electronic devices. Laminates used for this purpose are generally composed of a polar substrate layer with excellent barrier properties (blocking gases such as oxygen) and a non-polar polyolefin-based resin layer with excellent moisture resistance and chemical resistance. Among polyolefin resins, polypropylene resin is widely used as a thermoplastic molding material due to its excellent heat resistance, chemical resistance, and rigidity. However, it is common practice to use acid modification to achieve adhesion to polar substrate layers. Additionally, elastomers are typically blended with polypropylene resin to impart flexibility and wettability, thereby achieving improved adhesion. Furthermore, since polypropylene resin is a material with insufficient gas barrier properties, it is common practice to use it in a multilayer laminate form with polar materials to compensate for this. However, because polypropylene resin is a non-polar material, it has a lack of adhesion to polar materials with excellent gas barrier properties, such as polyamide resins, ethylene-vinyl alcohol copolymers, and metals. To address these issues, acid-modified polypropylene, manufactured using a technique that modifies polypropylene resin with unsaturated carboxylic acids or their derivatives, has been widely used in the past. However, since using such acid-modified polypropylene alone results in insufficient flexibility and wettability, it is typically used in combination with polypropylene resin, acid-modified polypropylene, and an elastomer component when applied as an adhesive resin. Nevertheless, even when using an elastomer, there is a risk that adhesion properties may deteriorate under heating conditions such as those using hot air ovens or microwave ovens. Therefore, there is a need to develop polyolefin resin compositions that exhibit excellent adhesion strength to polar substrates and adhesion strength to polar substrates after high-temperature thermal history. The background technology of the present invention is disclosed in Japanese Patent Publication No. 2004-269688, Korean Registered Patent No. 10-1200658, etc. The present invention will be described in detail below. The polyolefin resin composition according to the present invention comprises (A) random polypropylene resin; (B) propylene-ethylene-1-butene copolymer; (C) ethylene-propylene elastomer; (D) propylene-ethylene elastomer; and (E) maleic anhydride grafted polypropylene. In this specification, "a to b" indicating a numerical range is defined as "≥a and ≤b". (A) Random polypropylene resin A random polypropylene resin according to one embodiment of the present invention can be applied together with propylene-ethylene-1-butene copolymer, ethylene-propylene elastomer, propylene-ethylene elastomer, maleic anhydride graft polypropylene, etc., to improve the adhesion strength to a polar substrate (polyamide resin, ethylene-vinyl alcohol copolymer, metal, etc.) of a polyolefin resin composition, the adhesion strength to a polar substrate after high-temperature thermal history, moldability, etc., and a random polypropylene resin used in a conventional thermoplastic resin composition can be used. In a specific example, the random polypropylene resin may be a propylene-ethylene random copolymer having a propylene-derived component content of 90 to 99 mol%, for example, 94 to 98 mol%, and an ethylene-derived component content of 1 to 10 mol%, for example, 2 to 6 mol%. Within the above range, the mechanical properties, moldability, etc. of the polyolefin resin composition may be excellent. In a specific example, the random polypropylene resin may have a melting point (Tm) measured by a differential scanning calorimeter of 135 to 155°C, for example, 140 to 150°C, but is not limited thereto. Within this range, the mechanical properties, moldability, etc. of the polyolefin resin composition may be excellent. In a specific example, the random polypropylene resin may have a melt flow index of 0.1 to 4.5 g/10 min, for example, 1 to 3 g/10 min, measured at 230°C and 2.16 kg in accordance with ASTM D1238. Within this range, the mechanical properties and moldability of the polyolefin resin composition may be excellent. In a specific example, the random polypropylene resin may be included in an amount of 35 to 55 weight%, for example, 40 to 50 weight%, of the total polyolefin resin composition. If