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Multilayered container

a multi-layered, container technology, applied in the direction of containers preventing decay, packaging foodstuffs, packaged goods, etc., can solve the problem of uneven thickness of oxygen barrier resin layer, and achieve the effect of excellent solid-state molding processability

Inactive Publication Date: 2010-06-03
TOYO SEIKAN KAISHA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0004]An object of the present invention is to provide a multilayered container including an intermediate layer consisting of an oxygen-absorbing barrier resin composition which is excellent in solid-state molding processability.

Problems solved by technology

However, such solid-phase forming has problems such as tearing and uneven thickness of the oxygen barrier resin layer.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0071]Base resin (oxygen barrier resin) pellets made of an ethylene-vinyl alcohol copolymer resin (copolymerized with 32 mol % of ethylene) (EP-F171B: KURARAY CO., LTD.) was mixed with a transition metal catalyst of cobalt neodecanoate (cobalt content: 14 wt %) (DICANATE 5000: Dainippon Ink and Chemicals, Incorporated) by using a tumbler. Accordingly, 350 ppm of cobalt neodecanoate in terms of cobalt content was evenly attached onto the surface of the above-described base resin pellets.

[0072]Next, by using a twin screw extruder (TEM-35B: TOSHIBA MACHINE CO., LTD) equipped with a strand die at the outlet portion thereof was used to prepare oxygen-absorbing barrier resin composition pellets. The twin screw extruder was operated at screw revolution speed of 100 rpm and was evacuated through a low vacuum vent. Therein, 50 parts by weight of maleic anhydride-modified polybutadiene having an acid number of 40 mg KOH / g (M-2000-20: Nippon Petrochemicals Co., Ltd.) was added dropwise by usin...

example 2

[0077]A multilayered container was solid-phase formed in the same manner as Example 1, except that the sheet heating temperature was set to 159° C. Then, the multilayered container was subjected to the determination and the evaluation.

example 3

[0078]A multilayered container was solid-phase formed in the same manner as Example 1, except that the drawing ratio H / D was set to 1.6. Then, the multilayered container was subjected to the determination and the evaluation.

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Abstract

Disclosed is a multilayered container having an intermediate layer comprising an oxygen-absorbable barrier resin composition showing excellent processability upon molding. Specifically disclosed is a multilayered container which comprises an inner layer and an outer layer each comprising an olefin resin and an intermediate layer provided between the inner layer and the outer layer and comprising an oxygen-absorbable barrier resin composition, wherein the oxygen-absorbable barrier resin composition has a cooling crystallization peak temperature lower than that of a base resin (an oxygen barrier resin) which constitutes the oxygen-absorbable barrier resin composition, the multilayered container is formed by a solid-phase forming process at a temperature lower by 1 to 15° C. than the cooling crystallization starting temperature (Tc2) of the base resin, and the body of the container shows a calorific value of less than 0.5 J / g by the isothermal crystallization after heating from 30° C. to 130° C. at a heating rate of 100° C. / min in a thermal analysis of the body.

Description

TECHNICAL FIELD [0001]The present invention relates to a multilayered container having an intermediate layer consisting of an oxygen-absorbing barrier resin composition which is excellent in molding processability.BACKGROUND ART [0002]An oxygen barrier resin such as an ethylene-vinyl alcohol copolymer (EVOH) is used as a resin which is layered on a layer of a thermoplastic resin such as a polyolefin to form a multilayered container (refer to Patent Document 1).[0003]In molding a multilayered sheet which employs the oxygen barrier resin such as the ethylene-vinyl alcohol copolymer as an intermediate layer, a solid-phase forming is adopted from the viewpoint of improvement in transparency and mechanical properties. However, such solid-phase forming has problems such as tearing and uneven thickness of the oxygen barrier resin layer. Patent Document 1: Japanese Patent Application Publication No. 2005-187808DISCLOSURE OF THE INVENTION [0004]An object of the present invention is to provid...

Claims

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Application Information

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IPC IPC(8): B32B1/02
CPCB32B27/18Y10T428/1383B32B27/306B32B27/32B32B2250/03B32B2250/246B32B2250/42B32B2307/7244B32B2439/00B32B2439/40B32B2439/70B32B2439/80B65D81/26B29C51/002B29K2995/0067B29K2023/14B29K2023/12B29L2031/712B29K2023/08B29C51/14B29C51/10B29K2023/086B32B27/30B32B27/28B65D65/40B32B1/00
Inventor ISHIHARA, TAKAYUKIKIKUCHI, ATSUSHIGOTOU, HIROAKITANAKA, SHINJIMATSUMOTO, KENGO
Owner TOYO SEIKAN KAISHA LTD
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