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Preservative film

A technology of plastic wrap and polyvinylidene chloride, which is applied in the direction of flexible coverings, packaging, wrapping paper, etc., can solve the problems of low friction and non-discovery, and achieve the effect of low friction

Active Publication Date: 2016-09-28
KUREHA KAGAKU KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to improve the above-mentioned properties required for cling film, various attempts have been made. For example, the improvements disclosed in Patent Documents 1 to 3 have been made, but the desired combination of low friction, adhesion, peelability and Prescribed toughness plastic wrap

Method used

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  • Preservative film

Examples

Experimental program
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Effect test

preparation example Construction

[0038] 3. Preparation of Resin

[0039] The preparation of the resin to form a wrap film can be performed by a conventional method, respectively.

[0040] [Preparation of polyvinylidene fluoride-based resin]

[0041] For example, the polyvinylidene chloride-based resin preferably used as a resin for forming a fresh-keeping film is more preferably composed of 60 to 99 mass percent of vinylidene chloride and 40 to 1 mass percent of comonomer (commonomer of vinylidene chloride and comonomer) The total amount is 100% by mass) and the vinylidene chloride copolymer formed can usually be prepared by suspension polymerization or emulsion polymerization of predetermined amounts of vinylidene chloride and comonomer. The suspension polymerization method is a method in which mixed and dispersed oil droplets of vinylidene chloride and a comonomer are formed by mechanical stirring in an aqueous solvent containing a suspending agent, and polymerization is carried out using a polymerization in...

Embodiment 1

[0132] Using a single-screw extruder with a diameter of 90mm equipped with a vacuum hopper, melt-extrude the vinylidene chloride-vinyl chloride copolymer prepared according to a conventional method at a temperature of 180°C into a ring shape, and in a cooling tank at a temperature of 10°C After rapid cooling in , blow molding biaxial stretching was carried out at room temperature to obtain a plastic wrap with a thickness of 10 μm. In the vinylidene chloride-vinyl chloride copolymer in the plastic wrap, the mass ratio of vinylidene chloride:vinyl chloride (hereinafter sometimes referred to as "VD:VC ratio") is 85:15, and when the molecular weight is measured, the weight average The molecular weight (hereinafter sometimes referred to as "Mw") was 98,000, and the ratio of molecular chains with a molecular weight of 150,000 or more (hereinafter sometimes referred to as "the ratio of molecular weight of 150,000 or more") was 18.6% by mass. Hereinafter, the ratio of VD:VC, Mw, and m...

Embodiment 2

[0135] The composition of the vinylidene chloride-vinyl chloride copolymer was changed to obtain a plastic wrap. The VD:VC ratio of the vinylidene chloride-vinyl chloride copolymer in the cling film was 85:15, Mw was 98,000, and the proportion with a molecular weight of 150,000 or more was 18.8% by mass. Table 1 shows the film characteristics and sensory test evaluation results of this wrap film together with the resin composition.

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Abstract

A preservative film characterized by a coefficient of dynamic friction of 1.4 or less, a plane peel strength of 7 to 20N / 25cm2, and a piercing Young's modulus of 17kPa or more, preferably, a cling film as set forth which is made from a polyvinylidene chloride -based resin.

Description

technical field [0001] The present invention relates to a fresh-keeping film having a good balance of properties and excellent operability. Background technique [0002] Conventionally, in general households or restaurants, plastic cling film has been used when storing ingredients, dishes, etc. in refrigerators or freezers, or heating ingredients, dishes, etc. in microwave ovens. As a fresh-keeping film for food packaging, polyvinylidene chloride-based resins, polyvinyl chloride-based resins, polyethylene-based resins, polypropylene-based resins, polymethylpentene-based resins, polybutadiene-based resins, Polystyrene-based resins (thermoplastic elastomers such as styrene-butadiene block copolymers, etc.), polyester-based resins, polyamide-based resins (nylon), or ethylene-vinyl acetate copolymers, etc., as the main component resin film. As these resin films, there are unstretched films, uniaxially stretched films or biaxially stretched films, and laminated films, and these...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B65D65/02C08J5/18
CPCC08J5/18C08J2327/08
Inventor 增田键一细田友则田中幹雄松崎光浩江尻哲男
Owner KUREHA KAGAKU KOGYO KK
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