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Thermally shrinkable laminated film

A heat shrinkable, laminated film technology, applied in the direction of layered products, synthetic resin layered products, labels, etc., can solve the problems of peeling of the adhesive layer, increased cost, insufficient interlayer adhesion strength, etc.

Active Publication Date: 2012-07-11
DENKA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since a laminated film with an adhesive layer requires a step of forming the adhesive layer, the cost increases, and the adhesive layer may not be peeled off with shrinkage of the film.
On the other hand, although a laminated film without an adhesive layer can obtain a certain degree of interlayer adhesive strength by selecting a specific resin, the interlayer adhesive strength is still insufficient when used under practical conditions.

Method used

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  • Thermally shrinkable laminated film
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Examples

Experimental program
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Effect test

Embodiment

[0084] The following examples are given to illustrate the present invention. However, the present invention is not limited to these examples.

[0085] The block copolymers used in Examples and Comparative Examples can be produced by the methods shown in the following Reference Examples.

reference example 1

[0087] (1) 300 kg of cyclohexane containing 150 ppm tetrahydrofuran and 22 kg of styrene monomer were placed in a reaction vessel and kept at 30°C.

[0088] (2) 2080 mL of a 10% by mass cyclohexane solution of n-butyllithium was added as a polymerization initiator solution to anionically polymerize the styrene monomer.

[0089] (3) After the styrene monomer was completely consumed, the internal temperature of the reaction system was kept at 70° C., and at the same time, a total amount of 33 kg of styrene monomer and a total amount of 45 kg of butadiene were added to continue the reaction.

[0090] (4) After the reaction was completed, 330 g of water was added to make it deactivated, and the polymer-containing solution of Reference Example 1 was obtained.

[0091] (5) 0.4 parts by mass of Sumilizer GS manufactured by Sumitomo Chemical Co., Ltd. and 0.3 parts by mass of AO-50F manufactured by ADEKA Corporation were dissolved as a stabilizer per 100 parts by mass of the charged m...

Embodiment 1

[0109] (1) A mixture of 33% by mass of the block copolymer of Reference Example 1 and 67% by mass of the block copolymer of Reference Example 10 was used as an intermediate layer, and 98% by mass of SKYGREEN S2008 manufactured by SK Chemicals, Sumika NATURAL EPM-7Y029 manufactured by Color Co., Ltd. (Sumika Kara Co., Ltd.) was a 2% by mass polyester-based resin mixture as the front and back layers.

[0110] (2) Use a T-mode multi-layer sheet extruder (T die lip width 300mm), set the 40m / m extruder for the inner and outer layers to 240°C, and set the middle layer with a 65m / m extruder At 200°C, a laminated sheet having a layer ratio of 15 / 70 / 15 and a sheet thickness of 0.25mm was obtained at a mold temperature of 210°C.

[0111] (3) The obtained sheet was stretched 5 times in the transverse direction at 90° C. by a tenter-type transverse stretching machine to obtain a heat-shrinkable laminated film having a thickness of 50 μm.

[0112] (4) The heat shrinkage rate of the lamina...

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Abstract

Disclosed is a thermally shrinkable laminated film which is produced by laminating an intermediate layer comprising a block copolymer resin composition containing a specific block copolymer directly between a front layer and a back layer each comprising a polyester resin, and which has good interlayer adhesion strength. Specifically disclosed is a thermally shrinkable laminated film which is produced by stretching a three-layered laminated sheet in at least one direction so that the interlayer adhesion strength becomes 0.6 N / 15 mm or more, wherein the three-layered laminated sheet comprises an intermediate layer and a front layer and a back layer both comprising a polyester resin, wherein the three-layered laminated sheet comprises an intermediate layer, a front layer and a back layer, the intermediate layer comprises a resin composition comprising two types of block copolymers each having a specific structure and a specific composition at a specified content ratio, and each of the front layer and the back layer comprises a polyester resin.

Description

technical field [0001] The present invention relates to a heat-shrinkable laminated film in which a layer formed of a vinyl aromatic hydrocarbon-based block copolymer resin composition and a polyester layer are laminated. Background technique [0002] Heat-shrinkable films made of polystyrene resins are widely used as labels for PET bottle containers. In addition, a laminated film comprising a polyester-based resin as front and back layers and a polystyrene-based resin as an intermediate layer, and a laminated film having an adhesive layer between the above-mentioned layers have also been proposed. [0003] Examples of such techniques include those described in the following patent documents. However, since a laminated film having an adhesive layer requires a step of forming the adhesive layer, the cost increases, and the adhesive layer may not be peeled due to shrinkage of the film. On the other hand, although a laminated film without an adhesive layer can obtain a certai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/30
CPCB32B2250/40B32B2307/736B32B2270/00B32B2250/24B32B2307/516B32B27/08B32B2274/00B32B2250/03B32B2519/00B32B27/36B32B27/302B32B2307/30B32B2307/514B32B2325/00B32B2355/00B32B2367/00C08F36/06C08F236/06C08F236/10C08L25/04C08L25/06C08L25/08C08L53/02C08L2201/12C08L2203/16C08L2205/025Y10T428/1328Y10T428/31786Y10T428/31797Y10T428/31931
Inventor 佐藤英次大石真之中泽仁
Owner DENKA CO LTD
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