Gas barrier resin composition having oxygen-absorbing property and gas barrier structure having oxygen-absorbing property including the same

A technology of resin composition and oxygen absorption, applied in the direction of synthetic resin layered products, transportation and packaging, chemical instruments and methods, etc., can solve the problems of uneven phase separation, foreign matter, poor compatibility, and odor generation, and achieve excellent Oxygen absorption and gas barrier properties, excellent adhesion, excellent effects of oxygen absorption and gas barrier properties

Inactive Publication Date: 2008-03-19
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, with these technologies, the oxygen absorbability is only slightly improved, and on the other hand, due to the influence of the added oxygen catalyst, a part of the ethylene-vinyl acetate saponified copolymer is oxidized, and as a result, there is a problem that an odor is generated.
[0005] On the other hand, the saponified product of ethylene-vinyl acetate copolymer is particularly poor in compatibility with polyolefin resins, and it is easy to produce non-uniform molded films, bottles, etc. by extrusion molding from a resin composition containing both of them. Phase-separated foreign matter may cause significant damage to the appearance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0142] The method for producing the oxygen-absorbing gas-barrier multilayer structure of the present invention is not particularly limited. A single-layer structure (film, etc.) constituting each layer of the multilayer structure may be obtained, and these may be laminated or directly molded into a multilayer. structure.

[0143] For example, a multilayer structure such as a multilayer film can be prepared from a single layer film by extrusion coating, sandwich lamination, or dry lamination.

[0144] A well-known co-extrusion molding method can be used for the preparation of a multilayer extruded film, For example, extrusion molding can be performed using several extruders according to the kind of resin.

[0145] Examples of the coextrusion molding method include a coextrusion lamination method, a coextrusion sheet molding method, and a coextrusion blow molding method.

[0146] As an example, the oxygen-absorbing gas barrier structure layer, the sealing material layer, and ea...

Embodiment

[0158] The following preparation examples and examples are given to describe the present invention more specifically. Parts and % in each example are mass standards unless otherwise specified.

[0159] In addition, each characteristic was evaluated by the following method.

[0160] [Weight average molecular weight (Mw) of cyclized product of conjugated diene polymer]

[0161] Gel permeation chromatography was used to obtain the polystyrene-equivalent molecular weight.

[0162] [Unsaturated Bond Reduction Rate of Conjugated Diene Polymer Cyclized Product]

[0163] It can be determined by proton NMR measurement with reference to the methods described in the literatures of the following (i) and (ii).

[0164] (i) M.A. Golub and J. Heller. Can. J. Chem, Vol. 41, p. 937 (1963)

[0165] (ii) Y. Tanaka and H. Sato, J. Polym. Sci: Poly. Chem. Ed., Vol. 17, p. 3027 (1979).

[0166] In the conjugated diene monomer unit part of the conjugated diene polymer, the peak area of ​​all prot...

preparation example 1

[0181] (Preparation Example 1: Preparation of Conjugated Diene Polymer Cyclization AK)

[0182] A hexane solution containing 8,000 parts of cyclohexane, 320 parts of styrene, and 19.9 mmol of n-butyllithium was added to an autoclave equipped with a stirrer, and the internal temperature was raised to 60° C., followed by polymerization for 30 minutes. The polymerization conversion of styrene was about 100%. When a part of the polymerization solution was taken and the weight average molecular weight of the obtained polystyrene was measured, it was 14,800.

[0183] Then, while controlling the internal temperature so as not to exceed 75°C, 1840 parts of isopropylene was continuously added over 60 minutes. After completion of the addition, it was further allowed to react at 70° C. for 1 hour. The polymerization conversion rate at this time was almost 100%.

[0184] In the obtained polymerization solution, add 0.362 parts of a 1% aqueous solution of the sodium salt of β-naphthalen...

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Abstract

To provide a gas barrier resin composition which is excellent in the oxygen-absorbing property and further excellent in the adhesiveness with an olefin resin, and a structure comprising the composition, and a multilayer structure including the structure. A gas barrier resin composition having oxygen-absorbing property, which comprises a cyclized conjugated diene polymer and an ethylene-vinyl alcohol copolymer exhibiting a specific oxygen permeation rate. The above gas barrier resin composition having oxygen-absorbing property, which further comprises an a-olefin resin. A gas barrier structure having oxygen-absorbing property produced by molding the above gas barrier resin composition having oxygen-absorbing property. A gas barrier multilayer structure having oxygen-absorbing property, which comprises a layer of the above gas barrier structure having oxygen-absorbing property and a sealing material layer.

Description

technical field [0001] The present invention relates to a gas barrier resin composition excellent in oxygen absorption and a structure containing the same. In more detail, it relates to a gas barrier resin composition having excellent oxygen absorption properties and further excellent adhesion to olefin resins, a structure containing the same, and a multilayer structure containing the same. Background technique [0002] The saponified product of ethylene-vinyl acetate copolymer is thermoplastic and can be formed by various methods such as melt extrusion molding, injection molding, and hollow molding. Because of its oxygen barrier properties, it is used as a film, sheet, or bottle for packaging. s material. [0003] However, this oxygen barrier property cannot be said to be necessarily sufficient, and several methods for improvement have been proposed. For example, Patent Document 1 proposes an oxygen barrier resin composition containing an ethylene-vinyl acetate copolymer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L15/00C08L23/00B32B27/28
CPCC08L53/025C08L23/12B32B27/08C08C19/02C08L23/02C08L15/00C08C19/08C08L23/0861C08L23/06C08K5/098C08L9/06C08L29/04C08K2201/008Y10T428/1341Y10T428/249982C08L2666/06C08L2666/24C08L2666/02C08L65/00C08L101/00C09D201/00C09J201/00
Inventor 北原静夫
Owner ZEON CORP
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