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Resin compositions and use of the same

Inactive Publication Date: 2001-08-16
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0418] The resin composition of the present invention is excellent in moldability and capable of providing moldings having excellent pliability.[0419] Particularly, the soft resin composition of the present invention is excellent in melt flow characteristics, namely excellent in moldability, and is capable of providing moldings excellent in balance between pliability and heat resistance.[0420] Especially, the ethylene / .alpha.-olefin copolymer resin composition of the invention is excellent in heat stability and suitability for high-speed molding, and can provide the films excellent in mechanical strength properties, low temperature heat-sealing properties and sealing stability, and further in slip characteristics and anti-blocking properties, thereby being excellent in handling porperties and suitability for high-speed filling upon packaging by automatic filling machiens.[0421] The film of the present invention comprises the above ethylene / .alpha.-olefin copolymer resin composition to be mechanical strength properties, low temperature heat-sealing properties and sealing stability, and further in slip characteristics and anti-blocking properties thereby being excellent in handling properties and suitability for high-speed filing upon packaging by automatic filling machines.[0422] Accordingly, the films of the invention can be suitably used for standard sacks, heavy duty sacks, wrapping films, raw-film for lamination, sugar sacks, oil bags, water bags, various packaging film such as packaging films for foods, infusion bags and agricultural materials. The films of the invention can be used for multi-layered films by laminating with a base material of nylon, polyester or the like. Of these, the film of the invention is particularly suitable for the wrapping films.[0423] In addition, the ethylene / .alpha.-olefin copolymer resin composition of the invention is also employable for blow-molded infusion bags and bottles, extrusion molded tubes, pipes and pull-off caps, injection molded articles such as daily necessaries, fibers and big size moldings made by rotomolding.

Problems solved by technology

The conventional low-density polyethylene resins are excellent in heat resistance but do not have sufficient pliability.
However, such a method has a drawback in that, when the conventional ethylene elastomer is blended with the low-density polyethylene resins, the pliability of the resins is improved but the heat resistance thereof becomes remarkably worse.
Though the suitability for high-speed filling upon packaging by automatic filling machines is required for the purpose of packaging, the film made singly from the linear low-density ethylene / .alpha.-olefin copolymer does not always sufficiently satisfy the required handling characteristics and suitability for high-speed filling.
Therefore, it has a drawback in that, when they are molded into films at high speed in inflation molding, rocking or breakage of bubbles is liable to occur.
The linear low-density ethylene / .alpha.-olefin copolymer has a further drawback in that, since the number of branchings in its molecular chain is small, the flowability thereof in high-shear region becomes worse.
However, films of these compositions could not solve the above problems and, therefore, there is room for improvement in melt tension, flowability in high shearing region, low temperature heat-sealing properties, mechanical properties including tear strength, transparency, and antiblocking properties.

Method used

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  • Resin compositions and use of the same
  • Resin compositions and use of the same
  • Resin compositions and use of the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Ethylene / 1-Octene Random Copolymer

[0425] Preparation of Catalyst Solution

[0426] To a glass flask thoroughly purged with nitrogen, 0.5 mg of the following rac-dimethylsilylene-bis{1-(2-methyl-4-phenylindenyl)}zirconium dichloride: 4

[0427] (wherein Me represents methyl groups) was introduced. To the flask were further added 1.57 ml of a toluene solution of methylaluminoxane (Al: 1.1 mol / l) and 2.76 ml of toluene to obtain a catalyst solution.

[0428] Polymerization

[0429] To a 2 liter-stainless steel autoclave thoroughly purged with nitrogen, 600 ml of hexane and 300 ml of 1-octene were introduced, and the temperature of the system was elevated to 60.degree. C. Then, 1 mmol of triisobutylaluminum and 0.5 ml (0.001 mmol in terms of Zr) of the catalyst solution prepared above were injected into the autoclave together with ethylene to initiate polymerization. Thereafter, only ethylene was continuously fed to maintain the total pressure at 3.0 Kg / cm.sup.2-G, and the polymeriza...

example 2

[0459] A long-chain branched ethylene / 1-butene random copolymer was obtained in the same manner as in Example 1 except that 1-butene was used in place of 1-octene.

[0460] The copolymer thus obtained had a 1-butene content of 17% by mol, an MFR of 3.6 g / 10 min, a density of 0.870 g / cm.sup.3, an intrinsic viscosity (i), as measured in decalin at 135.degree. C., of 1.3 dl / g, a glass transition temperature (Tg) of -64.degree. C., a crystallinity, as measured by X-ray diffractometry, of 5%, a molecular weight distribution (Mw / Mn), as measured by GPC, of 2.1, a B value of 1.00, a g.eta.* value of 0.85 and a melt tension of 1.5 g.

[0461] Using the ethylene / 1-butene random copolymer, a soft resin composition containing a polyethylene resin were prepared in the same manner as in Example 1. The MFR, the surface hardness, the torsional rigidity and the heat sag were measured.

[0462] The results are set forth in Table 1.

reference example 1

[0490] Preparation of Ethylene / 1-Octene Random Copolymer

[0491] Preparation of a Catalyst Solution

[0492] To a glass flask purged thoroughly with nitrogen, 51 g of the above-mentioned rac-dimethylsilylene-bis{1-(2-methyl-4-phenylindenyl)}zir-conium dichioride was introduced, and further 1.57 liter of a toluene solution of methylalminoxane (Al: 1.1 mol / 1) and 2.76 liter of toluene were further added thereto to obtain a catalyst solution.

[0493] Polymerization

[0494] To a continuous solution polymerization device, the catalyst solution prepared as described above was continuously introduced at the rate of 0.02 mmol / hour in terms of zirconium atom along with 10 mmol / hour of tri-isobutyl aluminum. During polymerization, ethylene, 1-octene and hydrogen were continuously introduced to maintain a predetermined monomer composition (molar ratio of gaseous composition: ethylene / i-octene=0.83, hydrogen / ethylene=0.002), and copolymerization of ethylene and 1-octene was carried out on the condition ...

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Abstract

Asoft resin composition of the present invention comprises a polyethylene resin (A) and an ethylene / alpha-olefin random copolymer (B) comprising ethylene and an alpha-olefin having 3 to 20 carbon atoms at a specific proportion, wherein an MFR and density of the polyethylene resin (A), and a density, intrinsic viscosity, glass transition temperature, crystallinity, molecular weight distribution, B value and geta* values of the copolymer (B) are each in a specific range. The soft resin composition is excellent in melt flow characteristics, namely excellent in moldability, and is capable of providing moldings excellent in balance between pliability and heat resistance. An ethylene / alpha-olefin copolymer resin composition of the present invention comprises a liner ethylene / alpha-olefin copolymer (A-alpha) comprising ethylene and an alpha-olefin having 4 to 20 carbon atoms and a long-chain branched ethylene / alpha-olefin random copolymer (B-alpha) comprising ethylene and an alpha-olefin having 3 to 20 carbon atoms in a specific proportion, wherein a density and melt flow rate of the copolymer (A-alpha) and a density, MFR, intrinsic viscosity, glass transition temperature, crystallinity, molecular weight distribution, B value and geta* values of the copolymer (B-alpha) are each in a specific range. A film of the invention is produced from the resin composition. The ethylene / alpha-olefin copolymer resin composition is excellent in heat stability and suitability for high-speed molding, and can provide the films excellent in mechanical strength properties, low temperature heat-sealing properties and sealing stability, and further in slip characteristics and anti-blocking properties thereby being excellent in handling properties and suitability for high-speed filling upon packaging by automatic filling machines. The film also exhibits the effect as described above.

Description

[0001] The present invention relates to a polyethylene resin composition excellent in moldability and capable of providing moldings having excellent pliability.[0002] The present invention relates to a soft resin composition containing a polyethylene resin, which is capable of providing moldings excellent, particularly, in pliability and heat resistance and has an excellent moldability.[0003] The present invention also relates to an ethylene / .alpha.-olefin copolymer composition suitable for use mainly in packaging films. More particularly, the present invention relates to an ethylene / .alpha.-olefin copolymer composition which is, as compared with the conventional ethylene copolymer compositions, excellent in film-moldability and capable of high-speed molding, and also capable of providing a film excellent in machanical strength properties, low temperature heat-sealing properties and heat-sealing stability, and further in slip characteristics and anti-blocking properties thereby bein...

Claims

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Application Information

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IPC IPC(8): C08F4/642C08J5/18C08L23/04C08L23/08
CPCC08J5/18C08J2323/04C08L23/04C08L23/0815C08L2205/02C08L2205/025C08L2314/06C08L2666/04C08L2666/06
Inventor KAGAMI, MAMORUTANAKA, YASUOSUGI, MASAHIRO
Owner MITSUI CHEM INC
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