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
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[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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