Resin composition, and multilayer structure and packaging material using same

A technology of resin composition and copolymer, which is applied in household packaging, bio-packaging, transportation and packaging, etc. It can solve the problems of cooking shock, oxygen barrier reduction, and the quality reduction of the contents of the container, so as to suppress unpleasant odor, oxygen Excellent absorption effect

Pending Publication Date: 2022-01-28
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, EVOH exhibits excellent oxygen barrier properties at low humidity. On the other hand, when a container of a multilayer structure containing EVOH is subjected to high-temperature and high-pressure hot water treatment such as retort treatment, the oxygen barrier properties may be significantly reduced. The phenomenon of retort shock, which results in a reduction in the quality of the contents of the container

Method used

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  • Resin composition, and multilayer structure and packaging material using same
  • Resin composition, and multilayer structure and packaging material using same
  • Resin composition, and multilayer structure and packaging material using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment I

[0169] (Example 1: Production of oxygen-absorbing film and multilayer structure)

[0170] (I-a) Evaluation of oxygen absorption

[0171] Cut out 100 mg of the oxygen-absorbing films obtained in Examples I-1 to I-24 and Comparative Examples I-1 to I-5 as samples, put them in a pressure-resistant glass bottle with an inner volume of 35.5 mL under air, and use The aluminum lid with Naflon-rubber gasket was sealed and stored at 40°C and 22%RH for 14 days. The oxygen concentration in the container after storage was measured using Pack Master (manufactured by Iijima Denshi Kogyo Co., Ltd.).

[0172] (I-b) Evaluation of odor after oxygen absorption

[0173] The samples prepared and stored in the same manner as in (I-a) above were opened, and the odor in the container was judged by 5 professionals according to the following criteria, and the average score of the judgment results obtained was calculated. A lower score indicates less off-odor.

[0174] 5: A strong unpleasant odor like...

Embodiment I-1

[0184] (Example I-1: Production of an oxygen-absorbing film)

[0185] 100 mass of EPDM elastomer ("NORDEL IP4770P" manufactured by Dow Chemical Co., Ltd., Mw=200,000, MFR=0.07g / 10min) composed of monomers of ethylene, propylene, and 5-ethylidene-2-norbornene 0.4 parts by mass of manganese stearate as a transition metal catalyst (B) was mixed in each part, and a twin-screw kneading extruder (screw diameter: 25mmφ, L / D=30, manufactured by Toyo Seiki Seisakusho Co., Ltd.) was used. After melting and kneading at a barrel temperature of 230°C and a screw speed of 50 revolutions per minute, extrude from the mold in the form of strands into a cooling water tank at 5°C, and use a strand cutter to granulate. Thus pellets are obtained.

[0186] Next, the pellets were put into a single-layer extruder (screw diameter: 20mmφ, L / D=20, manufactured by Toyo Seiki Seisakusho Co., Ltd.), and the temperature of the barrel was 230°C, and the screw speed was 40 per minute. Melt-kneading was carr...

Embodiment I-2~I-6

[0188] (Examples I-2 to I-6: Production of oxygen-absorbing membranes)

[0189] Except that the ethylene-cyclic olefin copolymer (A) was changed to the EDPM elastomer composed of the monomer units described in Table 1, an oxygen-absorbing film was produced in the same manner as in Example I-1, and various Evaluation. The compositions of the oxygen-absorbing films are shown in Tables 1 and 2, and the results of evaluations (I-a) and (I-b) are shown in Table 3.

[0190] It should be noted that each EDPM elastomer recorded in the category column in Table 1 corresponds to the following products:

[0191] "NORDEL IP3745P" (manufactured by Dow Chemical Co., Ltd., Mw=140,000, MFR=0.2g / 10min)

[0192] "NORDEL IP4820P" (manufactured by Dow Chemical Co., Ltd., Mw=75,000, MFR=1g / 10min)

[0193] "Mitsui EPT K-9720" (manufactured by Mitsui Chemicals, Mw=60,000, MFR=2g / 10min)

[0194] "Mitsui EPT X-3012P" (manufactured by Mitsui Chemicals, MFR=5g / 10min)

[0195] "RoyalEdge5041" (manufa...

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Abstract

This resin composition contains: an ethylene-cyclic olefin copolymer (A) that includes a repeating unit that is represented by formula (I) and has an ethylene unit and a norbornene unit that has a substituent R1; and a transition metal catalyst (B). In the formula, R1 represents an ethylene group or an ethylene group that is substituted with a C1-3 aliphatic hydrocarbon group, and l and n respectively represent the content ratios of the ethylene unit and the norbornene unit that has the substituent R1, the ratio (l / n) of l and n being 4-2,000.

Description

technical field [0001] The present invention relates to a resin composition, a multilayer structure and a packaging material using the same, and more specifically, to a resin composition having excellent oxygen absorbing properties, a multilayer structure and a packaging material using the same. Background technique [0002] Gas-barrier resins such as ethylene-vinyl alcohol copolymer (hereinafter sometimes abbreviated as EVOH) are materials excellent in oxygen-barrier properties. Such a resin is capable of melt molding, and therefore, is laminated with a layer of a thermoplastic resin (polyolefin, polyester, etc.) excellent in moisture resistance, mechanical properties, etc., and is preferably used as a multilayer packaging material. However, the air permeability of these gas barrier resins is not completely zero, and a non-negligible amount of gas permeates through them. In order to reduce the permeation of this gas, especially the permeation of oxygen that has a significa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08L23/08C08L15/00C08K5/098C08K7/26C08J5/18B32B27/32B32B25/14B32B27/30B32B25/08B32B27/08B32B7/12B65D25/02B65D81/26
CPCC08K5/098C08K7/26C08L23/16C08J5/18B32B27/32B32B25/14B32B27/306B32B25/08B32B27/08B32B7/12B65D25/02B65D81/266B32B2250/24B32B2307/724B32B2307/7244B32B2553/00C08J2323/08C08J2323/16C08L23/0823C08L15/00C08L23/0853C08L23/0815B65D65/40B65D85/50C08K3/34C08L23/0861B32B2439/02B32B27/18B32B2439/70B32B27/34C08K3/105C08K5/005B32B27/325C08L2201/14C08L2203/16
Inventor 坂野豪尾下龙也
Owner KURARAY CO LTD
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