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US-20260125546-A1 - RESIN COMPOSITION, RESIN COMPOSITION FOR RECYCLING AGENT, USE IN RECYCLING AGENT, REGRIND LAYER, MULTILAYER STRUCTURE, PACKAGE, FOOD PACKAGE, AND METHODS FOR PRODUCING RECYCLING AGENT AND REGRIND LAYER

US20260125546A1US 20260125546 A1US20260125546 A1US 20260125546A1US-20260125546-A1

Abstract

The following is provided as a resin composition having excellent thermal stability and coloring suppression properties. A resin composition (X) comprising an ethylene-vinyl acetate copolymer (A), wherein the ethylene-vinyl acetate copolymer (A) contains carbon-14.

Inventors

  • Kota Teraoka

Assignees

  • MITSUBISHI CHEMICAL CORPORATION

Dates

Publication Date
20260507
Application Date
20260106
Priority Date
20230727

Claims (20)

  1. 1 . A resin composition (X) comprising an ethylene-vinyl acetate copolymer (A), wherein the ethylene-vinyl acetate copolymer (A) contains carbon-14.
  2. 2 . A resin composition (X) comprising: an ethylene-vinyl acetate copolymer (A); and a saponified ethylene-vinyl acetate copolymer (B) having an ethylene content of greater than 60 mol %, wherein the ethylene-vinyl acetate copolymer (A) and/or the saponified ethylene-vinyl acetate copolymer (B) contain carbon-14.
  3. 3 . The resin composition (X) according to claim 2 , wherein the ethylene-vinyl acetate copolymer (A) contains carbon-14.
  4. 4 . The resin composition (X) according to claim 2 , wherein a biobased content of the ethylene-vinyl acetate copolymer (A) and/or the saponified ethylene-vinyl acetate copolymer (B) having an ethylene content of greater than 60 mol % is from 1 to 100%.
  5. 5 . The resin composition (X) according to claim 2 , wherein a biobased content of the ethylene-vinyl acetate copolymer (A) is from 1 to 100%.
  6. 6 . The resin composition (X) according to claim 2 , wherein a biobased content of the ethylene-vinyl acetate copolymer (A) is from 40 to 100%.
  7. 7 . The resin composition (X) according to claim 2 , wherein an ethylene content of the ethylene-vinyl acetate copolymer (A) is from 60 to 98 mol %.
  8. 8 . A resin composition for a recycling agent, wherein the resin composition comprises the resin composition (X) according to claim 2 .
  9. 9 . The resin composition (X) according to claim 2 , further comprising a polyolefin resin (C).
  10. 10 . The resin composition (X) according to claim 2 , further comprising an ethylene-vinyl alcohol copolymer (D) having an ethylene content of 60 mol % or less.
  11. 11 . A resin composition (Y) comprising: an ethylene-vinyl acetate copolymer (A); a polyolefin resin (C); and an ethylene-vinyl alcohol copolymer (D), wherein the ethylene-vinyl acetate copolymer (A) contains carbon-14.
  12. 12 . A resin composition (Y) comprising: an ethylene-vinyl acetate copolymer (A); a saponified ethylene-vinyl acetate copolymer (B) having an ethylene content of greater than 60 mol %; a polyolefin resin (C); and an ethylene-vinyl alcohol copolymer (D), wherein the ethylene-vinyl acetate copolymer (A) and/or the saponified ethylene-vinyl acetate copolymer (B) contains carbon-14.
  13. 13 . The resin composition (Y) according to claim 12 , further comprising hydrotalcites (E).
  14. 14 . The resin composition (Y) according to claim 12 , further comprising a higher fatty acid metal salt (F).
  15. 15 . The resin composition (Y) according to claim 14 , wherein the higher fatty acid metal salt (F) is at least one selected from the group consisting of a higher fatty acid calcium salt, a higher fatty acid magnesium salt, and a higher fatty acid zinc salt.
  16. 16 . The resin composition (Y) according to claim 12 , further comprising a titanium compound (G).
  17. 17 . The resin composition (Y) according to claim 16 , wherein the titanium compound (G) is titanium oxide.
  18. 18 . A regrind layer comprising the resin composition (X) according to claim 1 .
  19. 19 . A multilayer structure comprising the regrind layer according to claim 18 .
  20. 20 . The multilayer structure according to claim 19 , further comprising a layer containing a polyolefin resin, wherein the layer does not contain the ethylene-vinyl acetate copolymer (A).

Description

RELATED APPLICATIONS This application is a continuation of International Application No. PCT/JP2024/026737, filed on Jul. 26, 2024, which claims priority to Japanese Patent Application No. 2023-122592, filed on Jul. 27, 2023 and Japanese Patent Application No. 2023-122593, filed on Jul. 27, 2023, the entire contents of each of which are herein incorporated by reference. TECHNICAL FIELD The present disclosure relates to a resin composition, a resin composition for a recycling agent, use in a recycling agent, a regrind layer, a multilayer structure, a package, a food package, and methods for producing a recycling agent and a regrind layer. BACKGROUND ART Ethylene-vinyl alcohol copolymers having ethylene contents of 60 mol % or less (hereinafter, referred to as “EVOH”) have been mainly used as food packaging materials in the art because of having excellent gas barrier properties and transparency. The sheet, film, and the like used as a food packaging material can be produced from the EVOH alone, but the EVOH may also be blended with another thermoplastic resin to improve physical properties and the like, or the sheet, film, and the like may be used by being formed into a multilayer structure in which layers made of a polyolefin resin and the like are laminated in order to impart other functions. Recently, for the purpose of reducing the environmental load, a used resin product, resin scraps or ends generated in the process of producing a resin product, or defective products are collected and recycled to produce a resin composition containing an EVOH and a polyolefin again from the collected materials. However, unfortunately, when melt molding is repeated using a resin composition containing EVOH and polyolefin, deterioration in quality of the resin composition occurs due to the effect of thermal history. Thus, as a resin composition that is less likely to be affected by repeated thermal history, for example, a resin composition containing an ethylene-vinyl acetate copolymer (hereinafter, referred to as “EVA”) and a saponified EVA having an ethylene content of greater than 60 mol % has been proposed (see Patent Document 1 listed below). Meanwhile, as a resin composition in which carbon emissions are reduced compared to a raw material produced by using only a fossil fuel source, a substance containing an EVA derived from a biomass resource has been proposed (see Patent Document 2 listed below). CITATION LIST Patent Literature Patent Document 1: WO 2009/041440 APatent Document 2: JP 2021-536526 T SUMMARY Technical Problem The present disclosure provides a resin composition having excellent thermal stability and suppressed coloring. Solution to Problem As a result of diligent research in response to the issue described above, the inventor of the present disclosure found that the issue is solved by using, for a resin composition containing an EVA and a saponified EVA, a material in which an EVA and/or a saponified EVA contains carbon-14 (14C (radioactive carbon-14; half-life: 5730 years)). That is, the present disclosure provides the following aspects. [1] A resin composition (X) comprising an EVA (A),wherein the EVA (A) contains carbon-14.[2] A resin composition (X) comprising:an EVA (A); anda saponified EVA (B) having an ethylene content of greater than 60 mol %,wherein the EVA (A) and/or the saponified EVA (B) containing carbon-14.[3] The resin composition (X) according to [2], wherein the EVA (A) contains carbon-14.[4] The resin composition (X) according to [2], wherein a biobased content of the EVA (A) and/or the saponified EVA (B) having an ethylene content of greater than 60 mol % is from 1 to 100%.[5] The resin composition (X) according to any one of [1] to [4], wherein a biobased content of the EVA (A) is from 1 to 100%.[6] The resin composition (X) according to any one of [1] to [4], wherein a biobased content of the EVA (A) is from 40 to 100%.[7] The resin composition (X) according to any one of [1] to [6], wherein an ethylene content of the EVA (A) is from 60 to 98 mol %.[8] A resin composition for a recycling agent, the resin composition 20 comprising the resin composition (X) according to any one of [1] to [7].[9] Use of the resin composition (X) according to any one of [1] to [7] for a recycling agent.[10] A recycling agent comprising the resin composition (X) according to any one of [1] to [7].[11] The resin composition (X) according to any one of [1] to [7], further comprising a polyolefin resin (C).[12] The resin composition (X) according to any one of [1] to [7], further comprising an EVOH (D) having an ethylene content of 60 mol % or less.[13] A resin composition (Y) comprising:an EVA (A);a polyolefin resin (C); andan EVOH (D),wherein the EVA (A) contains carbon-14.[14] A resin composition (Y) comprising:an EVA (A);a saponified EVA (B) having an ethylene content of greater than 60 mol %;a polyolefin resin (C); andan EVOH (D),wherein the EVA (A) and/or the saponified EVA (B) contains carbon-14.[1