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Multilayered structure

A multi-layer structure, outer layer technology, applied in the direction of layered products, synthetic resin layered products, packaged food, etc. synergistic effect

Active Publication Date: 2012-04-25
TOYO SEIKAN KAISHA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the use of ethylene / vinyl alcohol copolymer requires an adhesive layer that does not contribute to the improvement of the function of the packaging material, and in addition, makes the layer structure complicated, forcing the use of an extruder for forming the adhesive layer and raising the Cost of production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0161] By using a direct blow molding machine, under conditions of a shell diameter of 15 mm, a core diameter of 13 mm, and a molding temperature of 200° C., a wide-mouthed bottle-shaped multilayer structure (diameter of 44 mm, volume of 125 cc) was produced.

[0162] The layer structure consists of 4 types of 6 layers (outside of the container: polypropylene layer 50 μm / adhesive intermediate layer 25 μm / EVOH layer 35 μm / adhesive intermediate layer 25 μm / recycled material layer 300 μm / polypropylene layer 250 μm: inside the container).

[0163] The resin used was polypropylene (B251VT, manufactured by Prime Polymer Co.) and EVOH (Evar EP-F171B, manufactured by Kuraray Co.), and the adhesive intermediate layer was dry-blended by using EVOH and A blended resin of AD (Adomer QE840, manufactured by Mitsui Kagaku Co.) was formed.

[0164] In addition, the above-mentioned viscosities were measured as a=1620Pa·s, b=450Pa·s and η AB = 3.6.

[0165] Although try to rely on 1 H-NMR me...

Embodiment 2

[0168] A multilayer structure was formed in the same manner as in Example 1 except that the blending ratio of the resin used for the adhesive intermediate layer was changed to 5:5. The standard deviation of the multilayer structure was obtained, its oxygen barrier property and delamination were evaluated, and its sensory evaluation was performed, and the results shown in Table 1 were obtained.

Embodiment 3

[0170] Except using Adomer QE850 manufactured by Mitsui Kagaku Co. instead of using maleic anhydride-modified olefin resin (AD), and by using a blend resin of EVOH and AD (blend ratio 7:3) to the same as Example 1 A multilayer structure was formed in the same manner as in Example 1, except that an adhesive intermediate layer was formed in the same manner as in Example 1. The standard deviation of the multilayer structure was obtained, its oxygen barrier property and delamination were evaluated, and its sensory evaluation was performed, and the results shown in Table 1 were obtained.

[0171] Measure the viscosity of AD as b=320Pa·s, η AB = 5.1.

[0172] Although try to rely on 1 H-NMR measured the acid modification rate of AD, but the peak intensity was so weak that the determination could not be obtained correctly. However, from the peak area, it is estimated that the acid modification rate of AD is not more than 3.6 meq / 100g.

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Abstract

Provided is a multilayered structure that can make full use of the excellent oxygen-barrier properties of an ethylene / vinyl-alcohol copolymer without the provision of a separate adhesive layer, and can be effectively applied even when a polyolefin resin is used for inner and outer layers. The multilayered structure is provided with an adhesive middle layer between inner and outer layers, said adhesive middle layer comprising a blend of an ethylene / vinyl-alcohol copolymer (A) and a maleic anhydride modified olefin resin (B) mixed using a weight ratio between 4:6 and 8:2. The phase structure of the adhesive middle layer is either a sea-island structure with the maleic anhydride modified olefin resin (B) as the sea, or a bicontinuous phase. Using a scanning electron microscope to take a cross-sectional micrograph across the thickness of the multilayered structure, and using image-analysis software to quantify the contrast distribution in the neighborhood of phase boundaries between the ethylene / vinyl-alcohol copolymer (A) and the maleic anhydride modified olefin resin (B) in the adhesive middle layer, the standard deviation is at least 65.

Description

technical field [0001] The present invention relates to a multilayer structure having a layer of a blend of ethylene / vinyl alcohol copolymer and a maleic anhydride-modified olefin resin as an intermediate layer, and in particular, to a multilayer structure for packaging. Background technique [0002] Polyolefin resins such as polyethylene and polypropylene and polyester resins represented by polyethylene terephthalate have excellent characteristics such as moldability, transparency, mechanical strength and chemical resistance, and are used in various fields Used as packaging material. [0003] Here, the ethylene / vinyl alcohol copolymer (saponification product of ethylene / vinyl acetate copolymer) is a known resin having excellent oxygen barrier properties. In particular, in the field of packaging materials, multilayer structures have been widely used by using the above polyolefin resin and polyester resin as inner and outer layers and using a layer of ethylene / vinyl alcohol ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/28B32B27/32
CPCB32B2307/7244B32B7/12B32B27/306B32B27/08B32B27/00C09J129/04B32B7/02B32B2270/00B32B2250/24B32B27/32C08L29/04B32B1/02B32B2307/412B32B2250/05B32B2272/00B32B5/14B32B27/28C08L9/00B32B2307/718B32B2307/758B32B2439/00Y10T428/31913Y10T428/31938
Inventor 石原隆幸菊地淳
Owner TOYO SEIKAN KAISHA LTD
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