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Ethylene-vinyl alcohol copolymer-containing resin composition, film, laminate, packaging material, vacuum heat-insulating body, film production method, and laminate production method

A resin composition, vinyl alcohol technology, applied in the direction of metal material coating process, packaging, wrapping paper, etc., can solve the problems of pinhole suppression, insufficient lamination processability, unable to fully suppress, unable to reduce pinholes, etc., Achieves the effects of excellent vapor deposition defect suppression, excellent adhesion strength of vapor deposition layers, and improved appearance characteristics

Active Publication Date: 2016-02-03
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the method of containing an acid and a metal salt in an appropriate amount in the aforementioned Japanese Patent Laid-Open No. 2001-146539, the occurrence of coloring such as yellowing during melt molding cannot be sufficiently suppressed.
In addition, in the aforementioned JP 2000-265024 A, when an oxide and a boron compound are added, the lubricity and blocking resistance of the film are improved, but the suppression of pinholes generated during the vapor deposition process and the lamination processability are insufficient.
Furthermore, in the multilayer structure of the above-mentioned Japanese Patent Laid-Open No. 2005-290108, the pinholes generated in the layer treated with metal aluminum or silicon oxide cannot be reduced, so there is a concern that the barrier property will be reduced.
As such, conventional resin compositions cannot satisfy the above-mentioned requirements

Method used

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  • Ethylene-vinyl alcohol copolymer-containing resin composition, film, laminate, packaging material, vacuum heat-insulating body, film production method, and laminate production method
  • Ethylene-vinyl alcohol copolymer-containing resin composition, film, laminate, packaging material, vacuum heat-insulating body, film production method, and laminate production method
  • Ethylene-vinyl alcohol copolymer-containing resin composition, film, laminate, packaging material, vacuum heat-insulating body, film production method, and laminate production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0308] (Synthesis of water-containing EVOH pellets)

[0309] Using a 250 L pressurized reaction tank, polymerization was carried out under the following conditions to synthesize an ethylene-vinyl acetate copolymer.

[0310] (Feeding amount)

[0311] Vinyl acetate: 83.0kg

[0312] Methanol: 17.4kg

[0313] 2,2'-Azobisisobutyronitrile: 66.4g

[0314] (aggregation condition)

[0315] Polymerization temperature: 60°C

[0316] Polymerization tank ethylene pressure: 3.9MPa

[0317] Polymerization time: 3.5 hours

[0318] The polymerization rate of vinyl acetate in the above polymerization was 36%. After adding sorbic acid to the obtained copolymerization reaction liquid, it was supplied to a distillation column, and unreacted vinyl acetate was removed from the top of the column by introducing methanol vapor from the lower part of the column to obtain a 41% by mass methanol solution of an ethylene-vinyl acetate copolymer. The ethylene content of this ethylene-vinyl acetate c...

Embodiment 2~117 and comparative example 1~22

[0328] In Example 1, the types and amounts of the inorganic particles (B) and the aliphatic carbonyl compound (C), and the thickness of the vapor-deposited layer were changed as shown in Tables 1 to 3. In the same manner, a dry EVOH resin composition, a film, and a laminate (a laminate having an aluminum vapor-deposited layer) were obtained. The evaluation results of the obtained EVOH resin compositions, films, and laminates are shown in Tables 4 to 6.

[0329]

[0330]

[0331]

[0332]

[0333]

[0334]

[0335] From the results of Tables 4 to 6, it is clear that the films of Examples are excellent in appearance characteristics and film fracture resistance. In addition, among the laminated bodies, the laminated body obtained by vapor-depositing the metal on the film has few vapor-deposition defects, and has excellent adhesion strength between the metal vapor-deposited layer and the EVOH film layer. On the other hand, in the comparative example in which the...

Synthetic example 1

[0338] Using a 250 L pressurized reaction tank, polymerization of an ethylene-vinyl acetate copolymer was implemented on the following conditions.

[0339] (Feeding amount)

[0340] Vinyl acetate 91.2kg

[0341] Methanol 31.9kg

[0342] 2,2'-azobisisobutyronitrile concentration 2.0g / L (methanol solvent)

[0343] The supply rate of 2,2'-azobisisobutyronitrile is 828mL / hr.

[0344] (aggregation condition)

[0345] Polymerization temperature 60°C

[0346] Polymerization tank ethylene pressure 3.59MPa

[0347] Polymerization time 5.0 hours

[0348] The polymerization ratio of vinyl acetate in the obtained copolymer was about 40%. After adding sorbic acid to this copolymerization reaction solution, it was supplied to a distillation column, and unreacted vinyl acetate was removed from the top of the column by introducing methanol vapor from the lower part of the column to obtain a 41% methanol solution of an ethylene-vinyl acetate copolymer. The ethylene content of this ethy...

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Abstract

The purpose of the present invention is to provide a resin composition having excellent external appearance properties after melt molding, such as color of a film end section (roll end section), etc., and having excellent film breakage resistance, blocking resistance, deposition defect-suppressing properties, and adhesion strength of a deposition layer. The present invention is a resin composition containing an ethylene-vinyl alcohol copolymer, inorganic particles, and a C3-8 aliphatic carbonyl compound. The inorganic particle content thereof is 50-5,000 ppm. The aliphatic carbonyl compound is at least one type selected from a group comprising a saturated aldehyde, an unsaturated aldehyde, and a saturated ketone. The aliphatic carbonyl compound content is 0.01-100 ppm. The metal elements configuring the inorganic particles are ideally at least one type selected from a group comprising silicon, aluminum, magnesium, zirconium, cerium, tungsten, and molybdenum.

Description

technical field [0001] The present invention relates to a resin composition containing an ethylene-vinyl alcohol copolymer (hereinafter abbreviated as "EVOH"), a film formed from the resin composition, a laminate having a layer containing the above film, and a package including the above film or laminate A material, a vacuum heat insulator including the above-mentioned laminate, a method for producing the above-mentioned film, and a method for producing the above-mentioned laminate. Background technique [0002] The EVOH resin composition has excellent gas barrier properties, and is molded into a film, sheet, container, etc., and widely used as various packaging materials and the like. For example, an EVOH film constitutes a laminate with a thermoplastic resin film excellent in moisture resistance, mechanical properties, etc., especially a polyolefin resin film, and is used as a packaging material in various fields. Such packaging materials are widely used in the fields of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04B65D65/40C08J5/18C08K3/22C08K5/07C23C14/14F16L59/06C08J7/043C08J7/048C08J7/052
CPCC08K5/07C23C14/14C08J2329/04B29B9/12C08K3/01C08J5/18C08J7/052C08J7/048C08J7/043C08J7/06C08L29/04C08J2323/08C08K3/22C08K3/36C08K2003/2213C08K2003/222C08K2003/2227C08K2003/2244C08K2003/2255C08K3/02
Inventor 河合宏野中康弘
Owner KURARAY CO LTD
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