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Multilayer structure and method for producing same

A technology for a multilayer structure and a manufacturing method, applied in chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve the problems of reduced durability, insufficient gas barrier properties, and insufficient interlayer adhesion.

Active Publication Date: 2012-10-03
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if these conventional multilayer structures (1) and multilayer structures (2) are used, the interlayer adhesiveness is insufficient, cracks are likely to occur in the barrier layer due to interlayer peeling, etc., and the durability may decrease.
As a result, the conventional multilayer structure (1) may have insufficient gas barrier properties when used in food packaging, etc.

Method used

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  • Multilayer structure and method for producing same
  • Multilayer structure and method for producing same
  • Multilayer structure and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0345] (Manufacture Example 1 [Manufacture of Pellet (A-1)])

[0346] Add 20,000 parts by mass of vinyl acetate, 2000 parts by mass of methanol, and 10 parts by mass of 2,2'-azobis-(4-methoxy-2,4 -Dimethylvaleronitrile), nitrogen substitution was carried out while stirring, and then ethylene was introduced to adjust the internal temperature to 60°C and the ethylene pressure to 45 Kg / cm 2 , keeping the temperature and pressure, stirring for 4 hours to make it polymerized. Next, 10 parts by mass of sorbic acid (SA) (0.05% by mass relative to the charged vinyl acetate) was dissolved in methanol to make a 1.5% by mass solution and added. The polymerization rate was 45% with respect to the charged vinyl acetate. This copolymerization reaction solution was extruded and supplied, and methanol vapor was introduced from the lower part of the column, whereby unreacted vinyl acetate was removed from the top of the column, and a 40% methanol solution of the copolymer was obtained. ...

manufacture example 2

[0349] (Manufacture example 2 [Manufacture of pellet (A-2)])

[0350] Add 20,000 parts by mass of vinyl acetate, 4000 parts by mass of methanol, 10 parts by mass of acetyl peroxide as a polymerization initiator (500 ppm relative to the amount of vinyl acetate added), 0.4 Parts by mass of citric acid (20 ppm relative to the amount of vinyl acetate added) and 560 parts by mass of 3,4-diacetoxy-1-butene were replaced with nitrogen while stirring, and then ethylene was introduced to adjust to Internal temperature 60°C, ethylene pressure 35 Kg / cm 2 , and then polymerized while slowly adding the entire amount of 180 parts by mass of 3,4-diacetoxy-1-butene, and polymerized for 6 hours until the polymerization rate was 50% relative to the added vinyl acetate. Then, 10 parts by mass of sorbic acid (SA) (500 ppm relative to the amount of vinyl acetate charged) was dissolved in methanol to make a 1.5% by mass solution and added. This copolymerization reaction solution was extruded...

manufacture example 3

[0356] (Manufacture Example 3 [Manufacture of Granules (A-3)])

[0357] Add 20,000 parts by mass of vinyl acetate, 1020 parts by mass of methanol, 3.5 parts by mass of 2,2'-azobis-(4-methoxy-2,4 -Dimethylvaleronitrile), nitrogen substitution was carried out while stirring, and then ethylene was introduced to adjust the internal temperature to 60°C and the ethylene pressure to 59 Kg / cm 2 , keeping the temperature and pressure, stirring for 4 hours to make it polymerized. Next, 10 parts by mass of sorbic acid (SA) (0.05% by mass relative to the charged vinyl acetate) was dissolved in methanol to make a 1.5% by mass solution and added. The polymerization rate was 30% with respect to the charged vinyl acetate. This copolymerization reaction solution was extruded and supplied, and methanol vapor was introduced from the lower part of the column, thereby removing unreacted vinyl acetate from the top of the column, and a 40% by mass methanol solution of the copolymer was obtain...

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Abstract

The disclosed multilayer structure provided with at least eight resin layers is characterized by: having, as resin layers, A layers comprising a resin composition containing a gas-barrier resin, and B layers comprising a resin composition containing a thermoplastic resin; containing a metal salt within at least one of the resin compositions of the adjacent A layers and B layers; the quantity of contained metal salt being at least 1 ppm and no more than 10,000 ppm in terms of the metallic element; and the interlayer adhesive force between the A layers and the B layers being at least 450 g / 15 mm. It is preferable that the A layers and B layers are layered in alternation. Furthermore, it is preferable for the average thickness of one layer of the A layers and / or the B layers to be at least 0.01 [mu]m and no more than 10 [mu]m.

Description

technical field [0001] The present invention relates to a multilayer structure having eight or more resin layers and a method for producing the same, more specifically, to a multilayer structure having excellent gas barrier properties, stretchability, thermoformability, and durability, and interlayer adhesiveness. Also excellent multilayer structure and its manufacturing method. Background technique [0002] Currently, laminated films having an ethylene-vinyl alcohol copolymer layer are used in applications such as food and medical packaging materials, taking advantage of their high gas barrier properties, stretchability, thermoformability, and the like. Recently, in order to improve various properties such as gas barrier properties, various multilayer structures have been proposed in which resin layers each having a thickness of a micrometer or submicrometer are laminated. [0003] As a conventional multilayer structure in which multiple resin layers of ethylene-vinyl alco...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/28B32B27/40B32B7/02
CPCB32B7/02B32B27/34B32B27/18B32B7/12B32B27/306B32B27/00B32B2307/7242B32B7/00B32B27/40B32B27/32B32B27/28B32B27/08Y10T428/24942Y10T428/24975
Inventor 田井伸二河合宏山越聪矶山晃太日笠正雄吉田健太郎
Owner KURARAY CO LTD
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