Heat-shrinkable film, moldings and heat-shrinkable labels made by using the film, and containers made by using the moldings or fitted with the labels

A technology of heat shrinkage and heat shrinkage rate is applied in the field of heat shrinkable films, molded products using the heat shrinkable films, heat shrinkable labels, and containers using the molded products or labels. Difficult and insufficient as a heat-shrinkable film, damage to transparency, etc., to achieve the effects of excellent mechanical properties, excellent heat-shrinkable properties, and excellent shrinkage processability

Active Publication Date: 2008-05-07
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, when the above-mentioned polycaprolactone, modified olefin compound, epoxidized diene-based block copolymer, natural rubber, polyisoprene, etc. are mixed with lactic acid-based resin, although the impact resistance is exhibited Improves the effect, but as a result, the transparency is significantly impaired, so it is difficult to call it a perfect technology when used in applications such as packaging materials that require confirmation of the contents
[0015] In addition, it is also known to mix polyacetal resin and diene rubber, natural rubber, silicone rubber, polyurethane rubber with polylactic acid resin, or to contain methyl (meth)acrylate in the shell layer, and to contain methyl (meth)acrylate in the core layer. A method of improving impact resistance by an impact modifier such as a multilayer structure selected from at least one of styrene units and butadiene units (see Patent Document 13), but it is not sufficient as a heat-shrinkable film
[0016] In addition, a method of blending a graft copolymer obtained by graft-polymerizing a rubbery polymer and a vinyl monomer into a polylactic acid-based resin has also been proposed (see Patent Document 14), but this is not sufficient as a heat-shrinkable film.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0347] As shown in Table 1, PLA1: 50% by mass, PMMA2: 25% by mass and rubber 1: 25% by mass were put into a twin-screw extruder manufactured by Mitsubishi Heavy Industries, and the set temperature was 200 It was melt-mixed at °C, extruded using a T-die, drawn by a casting roll at 50°C, cooled and solidified to obtain an unstretched sheet with a width of 300 mm and a thickness of 250 μm. Next, using a film tenter manufactured by Mitsubishi Heavy Industries, Ltd., at a preheating temperature of 90°C and a stretching temperature of 85°C, it was stretched 5.0 times in the transverse uniaxial direction to obtain a heat-shrinkable film with a thickness of 50 μm. film.

[0348] A film whose evaluation items are all ⊚ is evaluated as (⊚) comprehensively, a film containing ◯ is comprehensively evaluated as (◯), and a film with only one X is comprehensively evaluated as (×). The results of the evaluation are shown in Table 1.

Embodiment 2

[0350] As shown in Table 1, in Example 1, except that rubber 1 was changed to rubber 2, and the composition ratio was changed to PLA1: 60% by mass, PMMA1: 15% by mass, rubber 2: 25% by mass, and Example 1 A heat-shrinkable film was obtained in the same manner. Table 1 shows the evaluation results of the obtained film.

Embodiment 3

[0352] As shown in Table 1, a heat-shrinkable film was obtained in the same manner as in Example 2 except that the rubber 1 was not included in Example 1, and the composition ratio was changed to PLA1:60% by mass and PMMA1:40% by mass. Table 1 shows the evaluation results of the obtained film.

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PUM

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Abstract

The aim of the present invention is to obtain a heat-shrinkable film which is excellent in mechanical characteristics such as heat shrinkage characteristics, impact resistance, and transparency and in the finish of shrinkage and which is suitable for shrink packaging, shrink bundling, shrinkable labels, and so on. A film which is made from a mixed resin comprising as the main components either a polylactic acid resin (A) and a (meth)acrylic resin (B) or a polylactic acid resin (A) and a silicone/acrylic composite rubber (D) or has at least one layer made from the mixed resin and which exhibits a heat shrinkage percentage of 20% or above in the main shrinkage direction when dipped in water at 80 C for 10 seconds.

Description

technical field [0001] The present invention relates to a heat-shrinkable film, a molded product using the heat-shrinkable film, a heat-shrinkable label, and a container on which the molded product or the label is attached. Heat-shrinkable films that are excellent in properties, transparency, etc., and are suitable for shrink packaging, shrink-bundling, or shrink labels, molded articles using the heat-shrinkable film, heat-shrinkable labels, and molded articles using the molded article or affixed with the heat-shrinkable film label container. Background technique [0002] Currently, soft drinks such as fruit juices and alcoholic beverages such as beer are sold in the 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 container. As a raw material for the heat-shrinkable label, polyvi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18B32B27/30B32B27/36B65D23/08C08L33/00C08L67/04C08L83/04C08L101/16
CPCY02W90/10
Inventor 比留间隆山田刚干宫下阳泽晃一田中一也高木润
Owner MITSUBISHI CHEM CORP
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