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KR-102961843-B1 - Polymerizable article comprising a blend of PBAT, PLA, and carbohydrate-based polymerizable material

KR102961843B1KR 102961843 B1KR102961843 B1KR 102961843B1KR-102961843-B1

Abstract

A composite blend of PLA, a carbohydrate-based polymerizable material, and PBAT (or other similar polyester). Although PLA cannot self-compost under household composting conditions (e.g., a temperature of 28°C), it can be composted under these conditions when blended in the manner described herein. Since PBAT itself is very flexible, to the extent that it is problematic for use in plastic bags, etc., PLA is added to increase the stiffness of the composite blend. An exemplary blend may contain 30 to 55% by weight of the carbohydrate-based polymerizable material, up to 20%, or up to 15% of PLA, and the remainder of the polymerizable content is PBAT (e.g., 30 to 60% PBAT). Other components (e.g., inorganic fillers such as calcium carbonate) may also be included in the blend.

Inventors

  • 알렌, 도날드 알.
  • 콴, 웬지
  • 라프레이, 브래드포드

Assignees

  • 바이올로지크, 인코퍼레이티드

Dates

Publication Date
20260507
Application Date
20200710
Priority Date
20190710

Claims (20)

  1. A first polyester plastic material comprising at least one of polybutyrate adipate terephthalate (PBAT), polybutylene succinate (PBS), or polycaprolactone (PCL), having a first elastic modulus; A second polyester plastic material comprising polylactic acid (PLA), wherein the elastic modulus of the first polyester plastic material is less than the elastic modulus of the PLA and the blend has an elastic modulus greater than that of the first polyester alone due to the PLA; and A carbohydrate-based polymerizable material formed by chemically, mechanically, or physically modifying starch and a plasticizer, wherein the carbohydrate-based polymerizable material is characterized by (1) having a crystallinity of less than 20% and not reverting to a crystalline structure; (2) having a water content of 2% by weight or less; and (3) when blended with a first and second polyester plastic material, the blend exhibits a lack of characteristics within the mixture. As a polyester-containing plastic material comprising a blend of, A polyester-containing plastic material characterized by at least 90% by weight of the polyester-containing plastic material being home compostable within 365 days at 28°C.
  2. In paragraph 1, a polyester-containing plastic material that substantially does not contain a compatibilizer.
  3. In claim 1, the first polyester plastic material comprises PBAT.
  4. A material according to claim 1, wherein a carbide-based polymerizable material is contained in an amount of 10% to 60% based on the weight of the blend.
  5. A material according to claim 1, wherein a carbide-based polymerizable material is contained in an amount of 30% to 60% based on the weight of the blend.
  6. A material according to claim 1, wherein PLA is contained in an amount of 1% to 20% based on the weight of the blend.
  7. A material according to claim 1, wherein PLA is contained in an amount of 5% to 15% based on the weight of the blend.
  8. A substance according to claim 1, characterized in that the plasticizer comprises at least one of glycerin, sorbitol, or other polyhydric alcohols.
  9. A substance according to claim 1, characterized in that the plasticizer comprises sorbitol.
  10. A material according to claim 1, wherein the first polyester plastic material comprises PBAT, and the PBAT is contained in an amount of 30% to 70% based on the weight of the blend.
  11. A material according to claim 1, wherein PLA exhibits composting at 28°C in a blend, whereas when PLA is tested alone, even if composting occurs, it exhibits reduced composting within 365 days at 28°C.
  12. A material according to claim 1, further comprising an inorganic filler in the blend.
  13. In paragraph 12, a material in which the inorganic filler comprises calcium carbonate.
  14. In paragraph 12, a material that is compostable at home within 365 days at 28°C ± 2°C when at least 90% by weight of the plastic material is determined under EN13432.
  15. Polybutyrate adipate terephthalate (PBAT) in an amount of 30% to 70% by weight of the blend; PLA in an amount of 1% to 20% based on the weight of the blend; and A carbohydrate-based polymerizable material formed by chemically, mechanically, or physically modifying starch and a plasticizer selected from glycerin and sorbitol, wherein the carbohydrate-based polymerizable material is characterized by (1) having less than 20% crystallinity and not reverting to a crystalline structure; (2) having a water content of 2% by weight or less; and (3) when blended with PBAT and PLA, the blend exhibits a lack of sea-is-a-side characteristics within the blend, and the carbohydrate-based polymerizable material constitutes 10% to 60% by weight of the blend. As a polyester-containing plastic material comprising a blend of, Polyester-containing plastic material characterized by at least 90% by weight of the polyester-containing plastic material being compostable at home within 365 days at 28°C ± 2°C under EN13432.
  16. A material according to claim 15, wherein a carbide-based polymerizable material is contained in an amount of 30% to 60% based on the weight of the blend.
  17. A material according to claim 15, wherein PLA exhibits composting at 28°C ± 2°C within the blend, whereas PLA alone exhibits reduced composting at 28°C ± 2°C even if composting occurs.
  18. A material according to claim 15, wherein PLA is contained in an amount of 5% to 15% based on the weight of the blend.
  19. delete
  20. A material according to paragraph 15, further comprising an inorganic filler in the blend.

Description

Polymerizable article comprising a blend of PBAT, PLA, and carbohydrate-based polymerizable material Cross-reference regarding related applications This application claims the benefits of U.S. Application No. 62/872,589 (21132.28) and No. 62/875,872 (21132.28.1), filed on July 10, 2019, and July 18, 2019, respectively. This application is also a partial continuation of U.S. Application No. 16/425,397 (21132.20.1), filed on May 29, 2019, which claims the benefits of U.S. Application No. 62/677,368 (21132.20), filed on May 29, 2018. U.S. Application No. 16/425,397 (21132.20.1) is also a partial continuation of U.S. Application No. 15/691,588 (21132.7), filed on August 30, 2017, which is a partial continuation of U.S. Application No. 14/853,725 (21132.8), filed on September 14, 2015, claiming the benefit of U.S. Provisional Patent Application No. 62/187,231, filed on June 30, 2015. U.S. Application No. 15/691,588 (21132.7) is also a partial continuation of U.S. Application No. 14/853,780 (21132.6), filed on September 14, 2015, and a partial continuation of U.S. Application Nos. 15/481,806 (21132.1) and 15/481,823 (21132.2), filed on April 7, 2017. U.S. Application No. 15/691,588 (21132.7) also claims the benefit of U.S. Provisional Application No. 62/440,399 (21132.10), filed December 29, 2016, and U.S. Provisional Application No. 62/422,432 (21132.11), filed January 4, 2017. The full contents of each of the above are incorporated herein by reference. Other applications are also incorporated herein by reference. For example, U.S. Application No. 62/483,219 filed on April 7, 2017 (21132.4); U.S. Application No. 15/836,555 filed on December 8, 2017 (21132.4.1); U.S. Provisional Patent Application No. 62/483,109 filed on April 7, 2017 (21132.5); U.S. Application Nos. 62/610,615 (21132.9) and No. 16/456,303 (21132.9.1), filed on December 27, 2017 and June 28, 2019, respectively. U.S. Application No. 62/610,618 (21132.12) and No. 16/456,295 (21132.12.1), filed on December 27, 2017 and June 28, 2019, respectively; U.S. Application No. 16/391,909 (21132.14.1), filed on April 23, 2019; U.S. Application No. 63/033,676 (21132.31), filed on June 2, 2020; PCT Application No. PCT/US2017/068492 (21132.1A), filed on December 27, 2017; and two additional non-provisional patent applications of the applicant having agent management numbers 21132.27.1.1 and 21132.30.1, filed on the same date as the present application, are incorporated herein by reference in their respective full text. Traditional petrochemical plastics are formulated to be strong, lightweight, and durable. However, these plastics are typically not biodegradable, and as a result, hundreds of millions of tons of plastic end up in landfills or floating in the ocean. In an effort to reduce the amount of plastic waste, some items typically produced using petrochemical plastics are now being manufactured using bioplastic materials defined as plastics made from renewable resources or biodegradable plastics. Large quantities of petrochemical plastic materials, such as polyethylene and polypropylene, as well as many other plastics (polyethylene terephthalate, polystyrene, ABS, polyvinyl chloride, polycarbonate, nylon, etc.), typically do not biodegrade easily in typical land disposal environments (e.g., landfills), or to a more severe degree when disposed of in marine environments. This generally applies equally to so-called "green" plastic materials, some of which are sourced from renewable or sustainable sources rather than petrochemical feedstocks. There are some special plastic materials that may exhibit some degree of compostability and/or biodegradability under certain processing conditions. For example, polylactic acid (PLA) and polybutyrate adipate terephthalate ("PBAT") (also known as poly(butylene adipate-co-terephthalate)) have been found to exhibit some degree of compostability under industrial composting conditions. While these processing conditions may allow for some biodegradability of PLA or PBAT under some of these conditions where the composting temperature is raised (e.g., 58°C), PLA does not exhibit compostability in typical domestic composting environments where the composting temperature is significantly lower. In other words, PBAT may exhibit some biodegradability under these domestic composting conditions (e.g., at 28°C under EN13432), whereas PLA does not exhibit significant biodegradability at all when processed in such environments. Moreover, PBAT itself is a very flexible material, so when items are placed in a bag formed from PBAT, it can bend significantly under applied load, making it not very suitable for use alone in bags or other film materials. PLA is more rigid but does not exhibit desirable compostable characteristics. Providing a film capable of addressing at least some of the aforementioned identified problems would be an improvement in the industry. In order to obtain the above-mentioned and other advantages of the present inventi