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Thermally shrinkable polyolefin film, molded article using the film, thermally shrinkable label, and container

A technology for polyolefins and polyolefin resins, applied in the field of polyolefin heat shrinkable films, can solve the problem of not being able to obtain low temperature shrinkage characteristics, and achieve the effects of excellent heat shrinkage characteristics, excellent shrinkage processability and beautiful appearance

Active Publication Date: 2008-12-03
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this sheet is for the purpose of making a film for shrink packaging of lunch boxes and non-staple food sold in convenience stores, etc., and is obtained by molding the shrink sheet by blow molding. Sufficient low-temperature shrinkage properties cannot be obtained when used for permanent labels

Method used

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  • Thermally shrinkable polyolefin film, molded article using the film, thermally shrinkable label, and container
  • Thermally shrinkable polyolefin film, molded article using the film, thermally shrinkable label, and container

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0160] As shown in Table 1, 5 parts by mass of ethylene-methacrylic acid-glycidyl methacrylate copolymer (manufactured by Sumitomo Chemical Co., Ltd., trade name "Bondfirst 7M", Hereinafter abbreviated as "C-1") to obtain a resin composition, put the resin composition into a twin-screw extruder manufactured by Toshiba Machine Co., Ltd., melt and mix it at a set temperature of 200°C, and form a single-layer T Extruded from a die, wound up with a cast roll (Cayast Roll) at 50° C., cooled and solidified to obtain an unstretched sheet with a width of 300 mm and a thickness of 200 μm, the mixed resin composition comprises: 25% by mass of atactic polymer Propylene resin (manufactured by Japan Polyethylene Co., Ltd., trade name "WintecWFX4T", MFR7.0g / 10 minutes, hereinafter referred to as "A-1"), 40% by mass of polyethylene resin (manufactured by Ube Industries, Ltd., trade name "UMERIT 0540F", MFR4.0g / 10 minutes, hereinafter referred to as "A-2"), 15% by mass hydrogenated petroleum ...

Embodiment 2

[0163] As shown in Table 1, 10 parts by mass of ethylene-methacrylic acid copolymerization (manufactured by Mitsui DuPont Polymer Chemicals Co., Ltd., trade name "Elvaloy 1126AC", MFR0.6g / 10 minutes, hereinafter abbreviated as "C-2"), except that heat shrinkability was obtained in the same manner as in Example 1. film. Table 2 shows the evaluation results of the obtained film.

Embodiment 3

[0165] As shown in Table 1, the composition is A-1: ​​20% by mass, A-2: 20% by mass, ethylene-vinyl acetate copolymer (manufactured by Mitsui DuPont Polymer Chemicals Co., Ltd., trade name "Evaflex EV560") relative to 100 parts by mass. ", ethylene content rate 86% by mass, MFR3.5g / 10min, hereinafter referred to as "A-4"): 35% by mass, B-1: 25% by mass of mixed resin, adding 30 parts by mass of ethylene-vinyl acetate copolymer (manufactured by Mitsui DuPont Polymer Chemicals Co., Ltd., trade name "EvaflexEV45LX", ethylene content rate 55% by mass, MFR 2.5g / 10 minutes, hereinafter referred to as "C-3"), except that, the same as Example 1 A heat-shrinkable film was obtained in the same manner. Table 2 shows the evaluation results of the obtained film.

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Abstract

Disclosed is a thermally shrinkable polyolefin film which comprises a mixed resin mainly composed of a polyolefin resin (A), a polylactic acid resin (B) and a resin (C) capable of improving the compatibility between the resin (A) and the resin (B) or has at least one layer comprising the mixed resin, wherein the ratio of the resin (A) to the resin (B) ((A) / (B)) is 99 / 1 to 70 / 30 by mass. The film has a thermal shrinkage ratio in at least one direction of 20% or higher as determined after immersing the film in hot water of 80 DEG C for 10 seconds, has a natural shrinkage ratio of less than 10% as determined after storing the film for 7 days under environment of 40 DEG C and 50% RH, is excellent in thermal shrinking properties and shrinkage finishing, and is reduced in natural shrinking. Also disclosed is a thermally shrinkable polyolefin label. Further disclosed is a container having the label thereon.

Description

technical field [0001] The present invention relates to a polyolefin-based heat-shrinkable film, a molded article using the film, a heat-shrinkable label, and a container. In more detail, the present invention relates to a polyolefin-based heat-shrinkable film that is excellent in heat shrinkability and shrink finishing quality and suppresses natural shrinkage, and is suitable for applications such as shrink packaging, shrink-bundling packaging, and shrink labels. Molded products of films, heat-shrinkable labels, and containers to which the above-mentioned molded products or heat-shrinkable labels are attached. Background technique [0002] Currently, soft drinks such as fruit juices and alcoholic beverages such as beer are sold in a state filled in containers such as bottles and PET bottles. At this time, in order to highlight the difference from other products or improve the visibility of the product, a printed heat-shrinkable label is often attached to the outside of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B32B27/36C08J5/18C08L23/00G09F3/04
CPCC08L23/0884C08J2323/02Y10T428/1352C08L51/06B32B27/08C08L23/0853B32B27/36C08L23/04Y10T428/31797C08L23/10C08L51/003C08L23/02Y10T428/1328C08L53/025C08L33/02C08J5/18Y10T428/2495C08L67/00C08L51/006C08L23/0869C08L2205/08C08F210/02B32B27/32C08L2666/06C08L2666/26C08L2666/18C08L2666/04C08L2666/14C08L2666/02C08F218/08C08F2500/12C08L23/00
Inventor 比留间隆山田刚干
Owner MITSUBISHI CHEM CORP
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