US-20260125553-A1 - A RESIN COMPOSITION AND A BIODEGRADABLE RESIN MOLDED PRODUCT COMPRISING THE SAME

Abstract

A resin composition that includes a polybutylene adipate terephthalate; a polylactic acid; and an acrylate-based copolymer, where the acrylate-based copolymer includes i) a first repeating unit derived from an alkyl (meth)acrylate-based monomer, ii) a second repeating unit derived from an epoxy (meth)acrylate-based monomer, and iii) a third repeating unit derived from an alkylene glycol (meth)acrylate-based monomer; and a biodegradable resin molded product including the resin composition. The resin composition exhibits excellent mechanical properties while maintaining the inherent biodegradability of polybutylene adipate terephthalate or polylactic acid.

Inventors

• Junsoo Moon
• Sung Eun Park
• Kihyun Yoo
• SangHoon HAN

Assignees

• LG CHEM, LTD.

Dates

Publication Date

20260507

Application Date

20231004

Priority Date

20221004

Claims (15)

1. 1 . A resin composition, comprising: a polybutylene adipate terephthalate; a polylactic acid; and an acrylate-based copolymer, wherein the acrylate-based copolymer includes i) a first repeating unit derived from an alkyl (meth)acrylate-based monomer, ii) a second repeating unit derived from an epoxy (meth)acrylate-based monomer, and iii) a third repeating unit derived from an alkylene glycol (meth)acrylate-based monomer.
2. 2 . The resin composition of claim 1 , which comprises 1 to 50 parts by weight of the polylactic acid based on 100 parts by weight of the polybutylene adipate terephthalate.
3. 3 . The resin composition of claim 1 , which comprises 0.1 to 10 parts by weight of the acrylate-based copolymer based on 100 parts by weight of the polybutylene adipate terephthalate.
4. 4 . The resin composition of claim 1 , wherein: the alkyl (meth)acrylate-based monomer comprises at least one selected from the group consisting of methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, isooctyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, isobornyl (meth)acrylate, and lauryl (meth)acrylate.
5. 5 . The resin composition of claim 1 , wherein: the epoxy (meth)acrylate-based monomer is a compound of Chemical Formula 1: wherein, in Chemical Formula 1: R1 is hydrogen or methyl; R2 is a single bond, methylene, or an oxyalkylene having 1 to 3 carbon atoms; and n is 1 to 10.
6. 6 . The resin composition of claim 1 , wherein: the alkylene glycol (meth)acrylate-based monomer is a compound of Chemical Formula 2: wherein, in Chemical Formula 2: R3 is hydrogen or methyl; R4 is an alkylene having 1 to 3 carbon atoms; R5 is hydrogen, an alkyl having 1 to 3 carbon atoms, or an oxyalkyl having 1 to 3 carbon atoms; and n is 1 to 10.
7. 7 . The resin composition of claim 1 , wherein: the acrylate-based copolymer has an epoxy equivalent of 400 to 600 g/eq.
8. 8 . The resin composition of claim 1 , wherein: the acrylate-based copolymer has a weight average molecular weight of 10,000 to 50,000 g/mol.
9. 9 . The resin composition of claim 1 , wherein: the acrylate-based copolymer has a glass transition temperature value of 60 to 90° C.
10. 10 . The resin composition of claim 1 , wherein: the resin composition has a weight average molecular weight of 100,000 to 200,000 g/mol.
11. 11 . The resin composition of claim 1 , wherein: a value of melt volume flow ratio (190° C., 5 kg) measured according to ASTM D1238 conditions is 2 to 10 ml/10 min.
12. 12 . The resin composition of claim 1 , wherein: a tensile strength value measured according to the ASTM D638 standard is 250 to 390 kgf/cm 2 .
13. 13 . The resin composition of claim 1 , wherein: an elongation value measured according to the ASTM D638 standard is 400% or more.
14. 14 . The resin composition of claim 1 , wherein: an average domain diameter value of polylactic acid is 1 μm or less.
15. 15 . A biodegradable resin molded product comprising the resin composition of claim 1 .

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) This application is a National Stage Application of International Application No. PCT/KR2023/015230 filed on Oct. 4, 2023, which claims the benefit of and priority to Korean Patent Application No. 10-2022-0126502 dated Oct. 4, 2022, and the All material disclosed in the literature is incorporated as part of this specification. TECHNICAL FIELD The present invention relates to a resin composition and a biodegradable resin molded product comprising the same. BACKGROUND ART Thermoplastic polymer resins have excellent mechanical and chemical properties and are used in various fields such as a drinking water container, a medical application, a food packaging paper, a food container, an automobile molded product, and an agricultural vinyl. Since thermoplastic polymer resins, especially polyethylene films, have excellent mechanical properties, are harmless to the human body, and can be continuously deformed by applying heat, they are often used as hot seal bags for food packaging, agricultural mulch films, and the like. Hot seal bags for food packaging are often used for vacuum packaging foods and the like, and polyethylene films and the like, which can achieve excellent bonding strength even at low sealing temperatures, are often used. The above agricultural film is often used in mulching farming. A mulch refers to a material that is used to cover the soil surface when cultivating crops. Covering the upper surface of the soil with various types of materials can inhibit the growth of weeds and prevent pests and diseases, thereby reducing the use of pesticides. In addition, the temperature of the soil can be easily adjusted, and beneficial bacteria in the soil can also be grown, thereby preventing soil erosion and maintaining soil moisture. Such mulch materials include, for example, leaves of crops such as rice straw and grass, or polyolefin-based films, and generally, synthetic resins such as polyethylene films are often used. However, as described above, polyethylene films, which are often used as a hot seal bags for food packaging or mulch materials, do not decompose in the natural environment and has limitations in their recycling. Particularly in recent years, it is known that discarded plastics, such as polyethylene films, flow into the sea, and are shredded into very small microplastics by reflux and sunlight in the sea. Currently, it is known that countless amounts of such microplastics, ranging from billions to tens of billions, are floating in the sea, which enters the bodies of sea creatures, accumulate within the ecosystem, and affect the entire food chain. Therefore, there is a need for research into environmentally friendly resins that can replace existing thermoplastic plastics. BRIEF DESCRIPTION Technical Problem It is an object of the present invention to provide a resin composition that can achieve excellent mechanical properties while being biodegradable. It is another object of the present invention to provide a biodegradable resin molded product comprising the above resin composition. Technical Solution According to one aspect of the invention, provided is a resin composition comprising: a polybutylene adipate terephthalate; a polylactic acid; and an acrylate-based copolymer, wherein the acrylate-based copolymer includes i) a first repeating unit derived from an alkyl (meth)acrylate-based monomer, ii) a second repeating unit derived from an epoxy (meth)acrylate-based monomer, and iii) a third repeating unit derived from an alkylene glycol (meth)acrylate-based monomer. According to an embodiment of the invention, the resin composition may comprise 1 to 50 parts by weight of polylactic acid based on 100 parts by weight of polybutylene adipate terephthalate. According to an embodiment of the invention, the resin composition may comprise 0.1 to 10 parts by weight of an acrylate-based copolymer based on 100 parts by weight of polybutylene adipate terephthalate. According to an embodiment of the invention, the alkyl (meth)acrylate-based monomer may comprise at least one selected from the group consisting of methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, butyl (meth)acrylate, isobutyl (meth)acrylate, t-butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, isooctyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, isobornyl (meth)acrylate, and lauryl (meth)acrylate. According to an embodiment of the invention, the epoxy (meth)acrylate-based monomer may be a compound of Chemical Formula 1: wherein, in Chemical Formula 1, R1 is hydrogen or methyl, R2 is a single bond, methylene, or an oxyalkylene having 1 to 3 carbon atoms, and n is 1 to 10. According to an embodiment of the invention, the alkylene glycol (meth)acrylate-based monomer may be a compound of Chemical Formula 2: wherein, in Chemical Formula 2, R3 is hydrogen