Vinylidene chloride copolymer, its composition, and its membrane or sheet material

A technology of vinylidene chloride-like copolymers, applied in the field of vinylidene chloride-like copolymers and their compositions, which can solve problems such as reduced productivity and uneven sealing strength, and achieve excellent dimensional stability and uniform film thickness Excellent, non-deformable effect

Active Publication Date: 2015-05-06
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Usually, for a film or sheet with uneven film thickness, when high-frequency sealing is performed to obtain a film or sheet package, since the electrode cannot always be adhered to the film or sheet under uniform pressure, the sealing strength Uneven, productivity tends to decrease

Method used

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  • Vinylidene chloride copolymer, its composition, and its membrane or sheet material
  • Vinylidene chloride copolymer, its composition, and its membrane or sheet material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] 3,3-Sulfur was introduced into a glass-lined reactor (internal volume 300 L) equipped with three-blade backward-curved blades (400 mm long diameter), a finger baffle, a thermometer, and a nitrogen gas introduction tube (internal volume: 300 L). Dilauryl dipropionate (DLTDP) 0.03 mass parts, polymerization initiator diisopropyl peroxydicarbonate 0.15 mass parts, vinyl chloride (VC) 18 mass parts, vinylidene chloride (VDC) 82 mass parts, with The mixed solution was stirred at a stirring speed of 1.4 m / sec for 20 minutes. Next, 2.5 parts by mass of an aqueous solution with a concentration of 2 mass % of suspending agent hydroxypropyl methylcellulose and 100 parts by mass of deionized water were added, and after stirring for 20 minutes to confirm the formation of particles, the temperature was heated to 35° C. at the initial stage of polymerization in a nitrogen atmosphere. , to initiate polymerization. After the reaction was continued for 15 hours, the stirring speed was ...

Embodiment 2～5

[0111] According to the mass fraction of vinylidene chloride charged in table 1, the mass fraction of vinyl chloride charged, the order of charging, the stirring speed at the start of polymerization, the ratio of stirring speed at the end / start, and the drying temperature, and In Example 1, Examples 2 to 5 were carried out in the same manner. The results are shown in Table 1.

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Abstract

The invention relates to a vinylidene chloride copolymer and its composition, the stretch processing adaptability during a melt molding process is excellent, thereby a membrane or a sheet material with excellent membrane thickness uniformity can be obtained, the high frequency seal adaptability and heating pressurization sterilization adaptability (so-called boiling adaptability) of the provided membrane or sheet material are excellent; The invention also provides a food package container, by using the above or the sheet material, the size stability during long-term preservation is excellent, and the product deformation is difficult to be generated. The vinylidene chloride copolymer is the vinylidene chloride copolymer formed by vinylidene chloride and a polymerism vinyl monomer, the copolymer is performed with differential scanning calorimetry thermal detection (DSC), the detected recrystallization temperature is more than 120 DEG C, and the crystallization melting temperature is below 170 DEG C.

Description

technical field [0001] The present invention relates to a vinylidene chloride-based copolymer and a composition thereof, which are excellent in stretching processability during melt molding and can obtain films or sheets with excellent film thickness uniformity; A film or sheet thereof excellent in property (so-called retort suitability); and a food packaging container using the film or sheet. Background technique [0002] Films, sheets, and containers made of vinylidene chloride-based copolymer compositions have oxygen barrier properties, moisture resistance, transparency, chemical resistance, oil resistance, adhesion, heat shrinkage, and the like. Excellent and suitable for food packaging materials, cling film, etc. Suspension polymerization and emulsion polymerization are used in the production methods of vinylidene chloride-based copolymer compositions for food packaging films. However, suspension polymerization is generally used because there are no problems such as re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F214/08C08L27/08
Inventor 吉田谦次武井徹
Owner ASAHI KASEI KK
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