MULTILAYERED CONTAINER

• US 20180093458A1
• Filed: 04/04/2016
• Published: 04/05/2018
• Est. Priority Date: 04/03/2015
• Status: Abandoned Application

• Current Assignee: Toyo Seikan Group Holdings, Ltd.
• Original Assignee: Toyo Seikan Group Holdings, Ltd.
• Inventors: MORI, Kota, ISHIHARA, Takayuki, TASHIRO, Yuuki, OTSUKI, Azusa
• Application Number:
  US15/562,488
• Publication Number:
  US 20180093458A1
• Time in Patent Office: Days
• CPC Class Codes: B32B 2270/00 Resin or rubber layer containing a blend of at least two different polymers
• CPC Class Codes: B32B 2307/7242 Non-permeable
• CPC Class Codes: B32B 2307/7244 Oxygen barrier
• CPC Class Codes: B32B 2307/74 Oxygen absorber
• CPC Class Codes: B32B 2439/40 Closed containers
• CPC Class Codes: B32B 2439/70 Food packaging
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/18 characterised by the use of special additives
• CPC Class Codes: B32B 27/306 comprising vinyl acetate or vinyl alcohol (co)polymers
• CPC Class Codes: B32B 27/308 comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: B65D 1/00 Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material by winding, bending, or folding paper B65D3/00, B65D5/00; specially constructed to be opened by cutting, piercing, or tearing of wall portions B65D17/00; pallets B65D19/00; details of bottles or of jars B65D23/00; bundles of articles held together by packaging elements for convenience of storage or transport, e.g. portable segregating carriers for plural receptacles such as beer cans, pop bottles, B65D71/00
• CPC Class Codes: B65D 1/40 Details of walls other container details B65D23/00, B65D25/00

Abstract

A multilayered container having an intermediate layer that contains a resin composition B obtained by blending a resin composition A that contains at least a resin (a) having a hydroxyl group with a carboxyl compound (b) of which the α-carbon is quaternary and of which the carboxyl group is forming no metal salt, wherein a ratio (COOH/OH) of the amount of the carboxyl groups of the carboxyl compound (b) to the amount of the hydroxyl groups of the resin (a) in the resin composition A is not more than 0.4 The multilayered container maintains excellent anti-eluting property and flavor-retaining property even when it is subjected to the retort sterilization.

Claims

1. A multilayered container having an intermediate layer that contains a resin composition B obtained by blending a resin composition A that contains at least a resin (a) having a hydroxyl group with a carboxyl compound (b) of which the α

-carbon is quaternary and of which the carboxyl group is forming no metal salt, wherein a ratio (COOH/OH) of the amount of the carboxyl groups of the carboxyl compound (b) to the amount of the hydroxyl groups of the resin (a) in the resin composition A is not more than 0.4.

2. The multilayered container according to claim 1, wherein said carboxyl compound (b) is an ethylene-methacrylic acid copolymer.

3. The multilayered container according to claim 1, wherein the resin (a) is an ethylene-vinyl alcohol copolymer.

4. The multilayered container according to claim 1, wherein said resin composition A, further, contains an olefin resin.

5. The multilayered container according to claim 1, wherein the ratio (COOH/OH) of the amount of the carboxyl groups of said carboxyl compound (b) to the amount of the hydroxyl groups of the resin (a) in said resin composition A is 0.04 to 0.4.

6. The multilayered container according to claim 1, wherein said resin composition A, further, contains an oxidizing organic component and a transition metal compound, and a ratio (COOH/OH) of the amount of the carboxyl groups of said carboxyl compound (b) to the amount of the hydroxyl groups of the resin (a) in said resin composition A is not more than 0.04.

7. The multilayered container according to claim 1, wherein the total amount of the organic carbon eluted out after the retort sterilization is less than 3.0 ppm.

8. The multilayered container according to claim 1, wherein the amount of the acetaldehyde eluted out after the retort sterilization is less than 40 ppb.

9. The multilayered container according to claim 3, wherein a decomposition start temperature of the ethylene-vinyl alcohol copolymer in said resin composition B is 20°

C. or more higher than a decomposition start temperature of the ethylene-vinyl alcohol copolymer in said resin composition A.

10. The multilayered container according to claim 1, wherein the multilayered container includes inner and outer layers comprising an olefin resin and an intermediate barrier layer comprising a barrier resin, and the intermediate layers that contain said resin composition B are interposed between any adjacent layers selected from the inner layer, the outer layer and the intermediate barrier layer.

11. The multilayered container according to claim 10, wherein said intermediate barrier layer has a multilayered structure comprising a barrier layer/an oxygen-absorbing layer/a barrier layer.

12. The multilayered container according to claim 10, wherein the layer constitution comprises a polypropylene inner layer/a regrind resin layer/an adhesive layer/a barrier layer/an oxygen-absorbing layer/a barrier layer/an adhesive layer/a regrind resin layer/a polypropylene outer layer in this order from the inner side, and said regrind resin layer contains said resin composition B.

13. The multilayered container according to claim 10, wherein a deodorizing component is contained in any layer that is positioned on the inner side of said oxygen-absorbing layer.

14. The multilayered container according to claim 13, wherein the layer constitution comprises a polypropylene inner layer/a deodorizing component-containing layer/as required, a regrind resin layer/an adhesive layer/a barrier layer/an oxygen-absorbing layer/a barrier layer/an adhesive layer/a regrind resin layer/a polypropylene outer layer in this order from the inner side, and said regrind resin layer contains said resin composition B.