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Block copolymer and process for production of thermally shrinkable film

A block copolymer and heat-shrinkable film technology, which can be used in flat products, applications, household appliances, etc., can solve the problems of difficult-to-heat shrinkable film expansion PET bottle beverages, uneven thickness, etc., and achieve excellent film-making stability and uniform thickness , Excellent shrinkage effect

Inactive Publication Date: 2008-09-10
ASAHI KASEI KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In addition, until now, the heat-shrinkable film obtained by blow molding using vinyl aromatic hydrocarbon block copolymers is prone to thickness unevenness due to large stretching in the longitudinal (MD) direction. Compared with the stenter stretching method, which is easy to control the vertical and horizontal shrinkage ratio and has good thickness accuracy, it is difficult to extend the heat shrinkable film produced by the blow molding method to PET bottle beverage applications, etc.

Method used

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  • Block copolymer and process for production of thermally shrinkable film
  • Block copolymer and process for production of thermally shrinkable film
  • Block copolymer and process for production of thermally shrinkable film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7 and comparative example 1、2

[0281] Using the component (I) obtained above, or the composition of the component (I) and the component (II) as a material, heat-shrinkable films are produced by blow molding. Specifically, in Examples 1 to 5, a composition containing component (I) and component (II) was used as the material of the present invention, and in Examples 6 and 7, component (I) was used.

[0282] With respect to 100 parts by weight of ingredient (I) or the composition, add 0.1 parts by weight of erucamide and 0.15 parts by weight of 2-(2'-hydroxy-3'-tert-butyl-5'-methyl-phenyl)- 5-Chlorobenzotriazole.

[0283] On the other hand, in Comparative Examples 1 and 2, block copolymers that do not satisfy the conditions of component (I) of the present invention were used as materials, wherein the styrene content of component (I) was 97% by weight, 58% by weight, ethylene The content of the base aromatic hydrocarbon is 65% by weight to 95% by weight.

[0284] The production conditions of the heat-shrinkab...

Embodiment 8～12 and comparative example 3、4

[0289] Next, heat-shrinkable films were produced by blow molding using component (III) shown in Table 6, or a composition of component (III) and component (IV) as a material. Specifically, in Examples 8 to 11, a composition containing component (III) and component (IV) was used as a material, and in Example 12, a component (III) was used as a material.

[0290] With respect to 100 parts by weight of ingredient (III) or the composition, add 0.1 parts by weight of erucamide and 0.15 parts by weight of 2-(2'-hydroxy-3'-tert-butyl-5'-methyl-phenyl)- 5-Chlorobenzotriazole.

[0291] On the other hand, in Comparative Examples 3 and 4, block copolymers that do not satisfy the conditions of component (III) of the present invention were used as materials, wherein the styrene content of component (III) was 97% by weight, 58% by weight, ethylene The content of the base aromatic hydrocarbon is 65% by weight to 95% by weight.

[0292] The manufacturing conditions and manufacturing apparat...

Embodiment 13～15 and comparative example 5

[0295] Based on the mixing formula shown in Table 7, use a 40mm extruder at 200°C to form a sheet with a thickness of 0.25mm, then set the stretching temperature at 87°C, and use a tenter to stretch 5 times on the transverse axis for uniaxial stretching stretched to obtain a heat-shrinkable film with a thickness of about 55 μm.

[0296] Combinations of components (III) and (IV) were used in Examples 13-15. On the other hand, in Comparative Example 5, a block copolymer that does not satisfy the requirements of component (III) of the present invention was used, wherein neither C-8 nor C-9 contained component (b), and component (a) / component (b ) is 10 / 90 to 90 / 10.

[0297] The film properties of the heat-shrinkable film are listed in Table 7. The results show that the performance of the heat-shrinkable film of the present invention is represented by the rigidity of the tensile elastic modulus, the low-temperature shrinkage expressed by the shrinkage rate of 80°C, the natural s...

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Abstract

Disclosed is a process for production of a thermally shrinkable film which is transparent and excellent in the balance among physical properties (e.g., stiffness, elongation, shrinkage in the length-wise and width-wise directions), particularly has an even film thickness and an excellent film stability, and can be formed by inflation method. Also disclosed is a block copolymer or a hydrogenated product thereof which is excellent in tensile properties, optical properties, hardness, stretching properties, processability, shrinking properties, solvent resistance and the like and suitable for extrusion molding, injection molding and production of a foaming article, or a composition comprising the block copolymer or hydrogenated product. A process for production of a thermally shrinkable film comprising: a first inflation step in which a block copolymer having a vinyl aromatic hydrocarbon content of 65 to 95% by weight and a conjugated diene content of 5 to 35% by weight or a hydrogenated product thereof (I) is used as the raw material to form a tube having a thickness of 0.05 to 0.5 mm; and a second inflation step in which, in continuation with the first inflation step, the tube is stretched in the TD direction by 1.5- to 5-fold in a fluid at a temperature of 65 to 100 DEG C to form a film.

Description

technical field [0001] The present invention relates to a method for producing a heat-shrinkable film, a block copolymer or its hydrogenated product, and a composition thereof. The heat-shrinkable film is formed by a blow molding method, is transparent, and has excellent properties in rigidity, elongation, and vertical and horizontal shrinkage. It is excellent in the balance of physical properties, especially the thickness of the film is uniform and the stability of film formation is excellent; the block copolymer or its hydrogenated product is suitable for extrusion molding (extruded sheet, extruded film, stretched sheet, stretched film) etc.), injection molding, foam, foam sheet, foam film, foam shrink film, etc., are excellent in tensile properties, optical properties, hardness, elongation properties, processability, shrinkage, etc. Background technique [0002] Block copolymers composed of vinyl aromatic hydrocarbons and conjugated dienes with high vinyl aromatic hydroca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F297/04C08J5/18C08K5/13C08L25/04C08L51/04C08L53/02B32B1/00
CPCC08F8/04C08F8/12C08F297/04C08J2353/02C08L25/08C08L25/14C08L51/04C08L53/02C08L53/025C08L2205/02C08L2205/03Y10T428/1331B29K2025/00C08J5/18C08F212/08C08L2666/02C08L2666/04C08L2666/24B29C49/00C08K5/13C08J2453/02C08L2201/08C08L2201/10C08L2203/16C08L2205/025B29C49/0015B29D7/01C08F293/00
Inventor 星进福冈亮子中村安孝
Owner ASAHI KASEI KK
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