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KR-20260067243-A - Acrylic-based impact modifier with core-shell structure and method of manufacturing the same

KR20260067243AKR 20260067243 AKR20260067243 AKR 20260067243AKR-20260067243-A

Abstract

The present invention relates to a core-shell copolymer comprising a core and a shell surrounding the core, wherein the core comprises a monomer composition comprising methyl methacrylate and glycidyl methacrylate and a polydimethylsiloxane crosslinking agent, and the shell comprises a monomer composition comprising methyl methacrylate and glycidyl methacrylate, and an impact modifier comprising an acrylic impact modifier having a core-shell structure capable of improving the impact resistance, transparency, and mold release properties of a biodegradable polyester resin comprising the same, a method for manufacturing the same, a polyester resin composition comprising the same, and a polyester resin molded article derived from the composition.

Inventors

  • 이창노
  • 이춘화
  • 권세현

Assignees

  • 주식회사 엘지화학

Dates

Publication Date
20260512
Application Date
20241105

Claims (15)

  1. As a core-shell structured acrylic impact modifier, The above core comprises a monomer composition including methyl methacrylate and glycidyl methacrylate and a polydimethylsiloxane crosslinking agent, and The above shell is a core-shell structured acrylic impact modifier comprising a monomer composition including methyl methacrylate and glycidyl methacrylate.
  2. In paragraph 1, The above core is a core-shell structured acrylic impact modifier comprising methyl methacrylate and glycidyl methacrylate in a weight ratio of 1.3:1 to 2.5:1.
  3. In paragraph 1, The above shell is a core-shell structured acrylic impact modifier comprising methyl methacrylate and glycidyl methacrylate in a weight ratio of 1:1.1 to 1:2.
  4. In paragraph 1, The above impact reinforcing agent is a core-shell structured acrylic impact reinforcing agent comprising 70 to 80 weight% of the core and 20 to 30 weight% of the shell based on the total weight.
  5. In paragraph 1, A core-shell structured acrylic impact modifier comprising the above-mentioned polydimethylsiloxane crosslinking agent in an amount of 0.1% by weight or more and less than 2% by weight based on the total weight of the core.
  6. In paragraph 1, The above core is a core-shell structured acrylic impact modifier comprising a seed containing alkyl acrylate and alkyl methacrylate in an amount of 1 to 15 weight percent based on the total weight of the core.
  7. In paragraph 1, With respect to the total weight of the above impact reinforcing agent, 3 to 7 weight% of a seed comprising alkyl acrylate and alkyl methacrylate; 60 to 90 weight% of a core comprising methyl methacrylate and glycidyl methacrylate in a weight ratio of 1.3:1 to 2.5:1; and A core-shell structured acrylic impact modifier comprising 10 to 40 weight% of a shell comprising methyl methacrylate and glycidyl methacrylate in a weight ratio of 1:1.1 to 1:2.
  8. In paragraph 6, A core-shell structured acrylic impact modifier having an average particle size of 60 nm to 130 nm.
  9. In paragraph 1, A core-shell structured acrylic impact modifier having an average particle size of 200 nm to 250 nm.
  10. a) a step of preparing a seed by polymerizing a monomer mixture for seed polymerization comprising an alkyl methacrylate, an alkyl acrylate, and a crosslinking agent; b) a step of preparing a core by mixing and polymerizing a prepared seed, a monomer composition comprising alkyl acrylate, methyl methacrylate, and glycidyl methacrylate, and a polydimethylsiloxane crosslinking agent; and c) a step of mixing and polymerizing a mixture of monomers for shell polymerization comprising methyl methacrylate and glycidyl methacrylate with a manufactured core to form a shell on the core, and In step b) above, methyl methacrylate and glycidyl methacrylate are mixed in a weight ratio of 1.3:1 to 2.5:1, and A method for manufacturing a core-shell structured acrylic impact modifier, wherein in step c) above, methyl methacrylate and glycidyl methacrylate are mixed in a weight ratio of 1:1.1 to 1:2.
  11. In Paragraph 10, A method for manufacturing a core-shell structured acrylic impact modifier, wherein the impact modifier is manufactured with an average particle size of 200 nm to 250 nm.
  12. In Paragraph 10, The above impact reinforcing agent, with respect to the total weight, 3 to 7 weight% of a seed comprising alkyl acrylate and alkyl methacrylate; 60 to 90 weight% of a core comprising methyl methacrylate and glycidyl methacrylate in a weight ratio of 1.3:1 to 2.5:1; and A method for manufacturing a core-shell structured acrylic impact modifier comprising 10 to 40 weight% of a shell comprising methyl methacrylate and glycidyl methacrylate in a weight ratio of 1:1.1 to 1:2.
  13. Polyester resin; and A polyester resin composition comprising a core-shell structured acrylic impact modifier according to any one of claims 1 to 9.
  14. A molded article comprising a polyester resin composition according to Clause 13.
  15. In Paragraph 14, A polyester molded article having an impact strength of 7 kg·f·cm/ cm² or more according to ASTM D256 and a haze of 5% or less according to ASTM D1003.

Description

Acrylic-based impact modifier with core-shell structure and method of manufacturing the same The present invention relates to a core-shell structured acrylic impact modifier and a method for manufacturing the same. Synthetic resins such as polyethylene, polystyrene, polypropylene, and polyvinyl chloride have been widely used across various industries for garbage bags, roll bags, shopping bags, food packaging, construction materials, and home appliances, occupying an indispensable position in daily life. While these synthetic resins possess excellent durability, they have poor biodegradability in natural conditions; consequently, their disposal after use poses a problem by adversely impacting ecosystems and causing environmental destruction. A proposed solution to address the aforementioned problems is the use of biodegradable polyester resins. These biodegradable polyester resins can be biodegraded into low-molecular-weight substances through the action of enzymes produced by environmentally present microorganisms, and subsequently decompose into water and carbon dioxide. Examples include polylactic acid, polybutylene succinate, polybutylene succinate-co-adipate, and polybutylene adipate-co-terephthalate. While these resins possess the advantages of exhibiting complete biodegradability and excellent biocompatibility while having physical properties similar to synthetic resins, they have disadvantages such as being brittle and easily breaking upon impact, as well as having low flexibility and heat resistance. Consequently, when polyester resins are applied in molding processes for manufacturing containers, defects such as breakage or cracking may occur. Therefore, there is a need to develop biodegradable resin compositions that are environmentally friendly due to their excellent biodegradability, and that are easy to utilize in various fields by ensuring mechanical properties such as elongation and impact strength suitable for molding processes, as well as productivity and processability. Unless otherwise defined in this specification, all technical and scientific terms are used merely to describe exemplary embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as “comprising,” “comprising,” or “having” are intended to specify the presence of the implemented features, numbers, steps, components, or combinations thereof, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, components, or combinations thereof. The present invention is capable of various modifications and may take various forms, and specific embodiments are illustrated and described in detail below. However, this is not intended to limit the invention to the specific disclosed forms, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention. The technical terms used in this specification are intended merely to refer to specific embodiments and are not intended to limit the invention. Furthermore, the singular forms used herein include plural forms unless the phrases clearly indicate otherwise. Core-shell structured acrylic impact modifier According to one embodiment of the present invention, the invention relates to an acrylic impact modifier comprising: a core comprising a monomer composition comprising methyl methacrylate (MMA) and glycidyl methacrylate (GMA), and a polydimethylsiloxane (PDMS) crosslinking agent; and a shell positioned on the core and comprising a monomer composition comprising methyl methacrylate and glycidyl methacrylate. The interior or surface of the core may include a plurality of seeds, and the core may be a structure that surrounds at least some of the surfaces of these seeds. The above seed may be a pre-polymerized polymer seed to facilitate the polymerization of the core. The above seed may include one or more of alkyl acrylate monomers and alkyl methacrylate monomers, and preferably may include both alkyl acrylate monomers and alkyl methacrylate monomers. The above alkyl acrylate monomer may be one or more selected from the group consisting of methyl acrylate, ethyl acrylate, butyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, propyl acrylate, heptyl acrylate, and octyl acrylate, but is not limited thereto. Preferably, it may include butyl acrylate. The alkyl acrylate monomer included in the above seed may be included in an amount of 75 wt% or more, 76 wt% or more, 77 wt% or more, 78 wt% or more, 79 wt% or more, 80 wt% or more, or 81 wt% or more based on the total weight of the seed, and may be included in an amount of 93 wt% or less, 92 wt% or less, 91 wt% or less, 90 wt% or less, or 89 wt% or less. Preferably, it may be included in an amount of 75 to 93 wt%, but is not limited thereto. If the content of the alkyl ac