Heat-shrinkable polyolefin film

A heat-shrinkable, olefin-based technology that can be used in thin material processing, applications, and household appliances to solve problems such as insufficient shrinkage and poor bonding strength

Inactive Publication Date: 2004-04-14
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the shrinkage rate over time is not sufficient, and it is preferable to further improve it
[0007] In addition, in order to improve rigidity, there is also known a method of using a cyclic olefin-based resin on the outer layer (for example, refer to Patent Document 3). The method of using a mixed solvent (a mixture of tetrahydrofuran and isopropyl alcohol, etc.) as a solvent, but only using tetrahydrofuran as a general solvent for sealing, the adhesive strength is poor, and it is preferable to further improve it.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Manufacture of resin composition and forming of film

[0087] 33 parts by weight of propylene-butene random copolymer (manufactured by Sumitomo Chemical Industries, Ltd., SP3811), 38 parts by weight of propylene-ethylene random copolymer (manufactured by Sumitomo Chemical Industries, Ltd., S131), 24 parts by weight of petroleum resin (manufactured by Arakawa Chemical Industry Co., Ltd., ALCONP140), 5 parts by weight of cyclic polyolefin (manufactured by Mitsui Chemicals Co., Ltd. APEL6011T, glass transition temperature T g = 105°C) mixed into the extruder, extruded from a T-shaped die at 230°C, cooled and solidified on a cooling roll maintained at 20°C, and then preheated at 90°C for 26 seconds, then cooled at 75°C Stretching with a tenter machine to 6 times in the transverse direction, and then slowly cooling at 70°C for 45 seconds while relaxing 8% in the width direction in the same tenter machine, to obtain a flat heat shrinkage with a thickness of 40 μm sex film. ...

Embodiment 2

[0090] In addition to using 33 parts by weight of propylene-butene random copolymer (manufactured by Sumitomo Chemical Industries, Ltd., SP3811), 37 parts by weight of propylene-ethylene random copolymer (manufactured by Sumitomo Chemical Industries, Ltd., S131) , 23 parts by weight of petroleum resin (manufactured by Arakawa Chemical Industry Co., Ltd., ALCONP140), 7 parts by weight of cyclic polyolefin (manufactured by Mitsui Chemicals Co., Ltd. APEL6011T, glass transition temperature T g =105° C.), the rest are the same as in Example 1. A flat heat-shrinkable film with a thickness of 40 μm was obtained. Table 1 shows the results of testing the stretched film by the above method.

Embodiment 3

[0092] Manufacture of resin composition and forming of film

[0093] As the resin composition of the substrate layer, 33 parts by weight of propylene-butylene random copolymer (manufactured by Sumitomo Chemical Industries, Ltd., SP3811), 38 parts by weight of propylene-ethylene random copolymer (Sumitomo Chemical Co., Ltd. Co., Ltd., S131), 24 parts by weight of petroleum resin (Arakawa Chemical Industry Co., Ltd., ALCON P140), 5 parts by weight of cyclic polyolefin (Mitsui Chemicals Co., Ltd., APEL6011T, glass transition temperature T g = 105°C). As the resin composition of the outer layer, 38.6 parts by weight of propylene-ethylene-butylene random copolymer (manufactured by Sumitomo Chemical Industries, Ltd., FL6741G), 50 parts by weight of hydrogenated butadiene-styrene rubber, 6 parts by weight of antistatic agent (containing 6 weight percent of glycerol and 96 weight percent of polypropylene (homopolymer)), 2 parts by weight of antiblocking agent (containing 10 weight pe...

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Abstract

The invention relates to a heat-shrinkable polyolefin-base film comprising a polypropylene-base resin, a petroleum resin in total and a cyclic polyolefin having a glass transition temperature not lower than 90 DEG C and lower than 140 DEG C, and a multilayer heat-shrinkable film comprising a base layer which comprises a polypropylene-base resin, a petroleum resin and a cyclic polyolefin, and at least one outer layer which comprises a styrene resin and a polyolefin resin.

Description

technical field [0001] The present invention relates to a heat-shrinkable polyolefin film mainly composed of a polyolefin resin. Background technique [0002] In recent years, shrink labels have been widely used for the purpose of improving the appearance of packaged products, avoiding direct impact on the packaged items, protecting glass or plastic bottles, and labeling products. Plastic materials used for these purposes include polyvinyl chloride, polystyrene, polyethylene terephthalate, polypropylene, and the like. [0003] However, although the polyvinyl chloride label has excellent shrinkage properties, it will produce chlorine gas when burned and cause environmental pollution. Although labels such as polystyrene or polyethylene terephthalate also have good heat shrinkability, they are difficult to suspend and separate due to the small difference in specific gravity with polyethylene terephthalate bottles, which hinders polyethylene terephthalate. Reuse of ethylene gl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32C08J5/18C08L65/00
CPCC08J2323/14C08L65/00C08J5/18B32B27/32Y10T428/31855Y10T428/31909
Inventor 桥冈徹高林清藏多保田规小田尚伸永野熙
Owner TOYOBO CO LTD
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