KR101768337B1 - Polyethylene Resin Composition for Plastic Closure and Article Produced with the Same - Google Patents

Polyethylene Resin Composition for Plastic Closure and Article Produced with the Same Download PDF

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KR101768337B1
KR101768337B1 KR1020150160356A KR20150160356A KR101768337B1 KR 101768337 B1 KR101768337 B1 KR 101768337B1 KR 1020150160356 A KR1020150160356 A KR 1020150160356A KR 20150160356 A KR20150160356 A KR 20150160356A KR 101768337 B1 KR101768337 B1 KR 101768337B1
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polyethylene resin
resin composition
melt flow
flow index
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KR20170056919A (en
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김동진
이영실
박지용
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한화토탈 주식회사
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
    • C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F210/02—Ethene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00—Polymerisation catalysts
    • C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
    • C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
    • C08F4/60—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
    • C08F4/62—Refractory metals or compounds thereof
    • C08F4/64—Titanium, zirconium, hafnium or compounds thereof
    • C08F4/659—Component covered by group C08F4/64 containing a transition metal-carbon bond
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
    • C08K5/005—Stabilisers against oxidation, heat, light, ozone

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  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
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Abstract

(A) 80 having a density of 0.950 to 0.970 g / cm 3 , a melt flow index of 0.8 to 10 g / 10 mn and a melt flow index ratio of 25 to 40, as ethylene alpha olefin copolymers polymerized with a Ziegler-Natta catalyst, To 95% by weight of an ethylene alpha olefin copolymer polymerized with a metallocene catalyst, the ethylene alpha olefin copolymer having a density of 0.900 to 0.920 g / cm 3 , a melt flow index of 0.5 to 5 g / 10 min, a melt flow index ratio of 20 to 30, The present invention relates to a polyethylene resin composition for use in a plastic bottle lid containing 5 to 20% of an olefin copolymer (B). In order to cope with the trend of high-speed processing, thinning and lightening of plastic bottle lids, A polyethylene resin composition having high environmental stress cracking resistance (ESCR) and high impact strength.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a polyethylene resin composition for a plastic bottle cap,

The present invention relates to a mixed resin composition of an ethylene alpha olefin copolymer having a narrow distribution of a copolymerized monomer polymerized with a high density polyethylene polymerized with a Ziegler-Natta catalyst and a metallocene catalyst, and a bottle lid molded article using the same, It has excellent processability and flexural modulus and provides excellent environmental stress cracking resistance (ESCR) and impact strength.

In recent years, plasticization of bottle lids used in beverage containers such as glass bottles and polyethylene terephthalate has been increasing due to diversification of packaging containers and separation of environmental aspects. High density polyethylene, polypropylene, etc. are mainly used as plastic bottle lid material. Bottle lid based on these materials is light and not corrosive compared with conventional aluminum bottle lid. Its use is increasing as a possible advantage. Especially, high density polyethylene has flexible characteristics compared to polypropylene, so it is possible to maintain the sealing property of the contents without using a liner, unlike a bottle cap made of polypropylene, which requires a separate liner to seal the contents of the beverage container . In order to reduce the manufacturing cost of the bottle lid by expanding the use of the polyethylene as a bottle lid, the flow rate is excellent in order to increase the production amount per unit time by high-speed processing, and the method of lowering the unit weight of the lid (thinning, Has been used. In order to make thinner and lighter, the polyethylene material for a bottle cap should have excellent bending strength, resistance to environmental stress cracking resistance and impact strength, and high flow rate of resin for high-speed processing. However, existing polyethylene bottle materials for bottle caps have limited applications due to their resistance to environmental stress cracking and impact strength when they have excellent flexural strength and flowability. Although the polyethylene resin composition is proposed to solve such a problem in the patent of KR10-0848526, WO2008 / 136849 and EP2017302B1, a resin composition excellent in all of the flexural strength, flowability, ESCR and impact strength has not been proposed.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and to provide a polyethylene resin having excellent flowability and flexural modulus while having excellent resistance to environmental stress cracking resistance (ESCR) and impact strength in order to respond to high- To provide a composition.

Another object of the present invention is to provide a molded article made of the polyethylene resin composition.

According to an aspect of the present invention,

An ethylene alpha olefin copolymer polymerized with a Ziegler Natta catalyst density of 0.950 ~ 0.970g / cm 3, melt flow index of 190 ℃ ASTM D1238, 0.8 ~ 10g / 10min , the melt flow index ratio at 2.16kg (MI21.6 / MI2.16) is an ethylene alpha olefin copolymer polymerized with a metallocene catalyst, having a density of from 0.900 to 0.920 g / cm < 3 > and a melt flow index of A plastic bottle containing 5 to 20% of an ethylene alpha olefin copolymer (B) having a melt flow index ratio (MI21.6 / MI2.16) of 20 to 30 at 190 DEG C and 2.16 kg of ASTM D1238 at a rate of 0.5 to 5 g / To a polyethylene resin composition for use in a lid.

Another aspect of the present invention relates to a molded article made of the polyethylene resin composition.

The polyethylene resin composition for a plastic bottle lid according to the present invention has a good flowability in processing a bottle lid molding product, facilitates high-speed processing, has high bending strength and impact strength and is advantageous for thinning and lightening, Is excellent.

Hereinafter, the present invention will be described in detail.

The present invention relates to an ethylene alpha olefin copolymer which is polymerized with a Ziegler-Natta catalyst and has a density of 0.950 to 0.970 g / cm 3 , a melt flow index of 0.8 to 10 g / 10 mn at 190 ° C and 2.16 kg of ASTM D 1238, (MI21.6 / MI2.16) is an ethylene alpha-olefin copolymer polymerized with a metallocene catalyst and having a density of 0.900 to 0.920 g / cm < 3 > The melt flow index is 5 to 20% of the ethylene alpha olefin copolymer (B) having a melt flow index ratio (MI21.6 / MI2.16) of 20 to 30 at 190 DEG C and 2.16 kg of ASTM D1238 at a rate of 0.5 to 5 g / The present invention also provides a polyethylene resin composition for use in a plastic bottle lid including the above-

In the present invention, when the density of the ethylene alpha-olefin copolymer (A) is less than 0.950 g / cm 3, the flexural modulus of the mixed composition is less than 8,000 kgf / cm 2 and the rigidity is lowered. Can not exceed 0.970 g / cm < 3 >.

When the melt flow index of the ethylene-alpha-olefin copolymer (A) is less than 0.8 g / 10 min or the melt flow index ratio is less than 25, the spiral flow length of the mixed composition is less than 65 cm, If the melt flow index exceeds 10 g / 10 min or the melt flow index ratio exceeds 40, the ESCR property may be less than 10 hours, which may be a problem with long-term storage stability.

When the weight ratio of the ethylene alpha-olefin copolymer (A) in the mixed composition is less than 80% by weight, the flexural modulus is less than 8,000 kgf / cm < 2 & Mechanical properties such as spiral flow length, flexural modulus and the like are insignificant.

If the density of the ethylene alpha olefin copolymer (B) is less than 0.900 g / cm 3 in the present invention, the mixing of the ethylene alpha olefin copolymer (A) and the ethylene alpha olefin copolymer (B) , The improvement of mechanical properties such as ESCR, Izod impact strength at room temperature, spiral flow length, and flexural modulus is insignificant when the density exceeds 0.920 g / cm < 3 >. Also, when the melt flow index ratio of the ethylene alpha olefin copolymer (B) exceeds 30, the Izod impact strength at room temperature is not improved.

According to one embodiment of the present invention, it is preferable that the ethylene alpha olefin copolymer (A) is polymerized with a Ziegler-Natta catalyst and the ethylene alpha olefin copolymer (B) is polymerized with a metallocene catalyst. This is because one of the ethylene alpha olefin copolymers is polymerized with a Ziegler-Natta catalyst and the other is polymerized with a metallocene catalyst.
The ethylene alpha olefin copolymer (B) has a composition distribution breadth index (CDBI) as measured by Crystallization Analysis Fractionation (CRYSTAF): a copolymer contained within 50% of the molar percentage at 50% of the cumulative fraction of the copolymer distribution curve %) May be 85 to 95%.

In the present invention, the melt flow index of the polyethylene resin composition is 0.5 to 15 g / 10 min, preferably 1 to 10 g / 10 min. If the melt flow index is less than 0.5 g / 10 min, the spiral flow length is less than 65 cm and the productivity deteriorates. If the melt flow index is more than 15 g / 10 min, the ESCR property is less than 10 hr.

In the present invention, the density of the polyethylene resin composition is 0.950 to 0.965 g / cm 3 , preferably 0.955 to 0.965 g / cm 3 . If the density is less than 0.950 g / cm 3, the bending strength is less than 8500 kgf / cm 2 and the rigidity is lowered. If the density exceeds 0.965 g / cm 3 , the ESCR property is less than 10 hours, , And the Izod impact strength at room temperature is less than 9 kgfcm / cm.

In the present invention, the melt flow index ratio (MI21.6 / MI2.16) of the polyethylene resin composition is 25 to 45, and more preferably 30 to 40. [ If the melt flow index ratio is less than 25, the spiral flow length is less than 65 cm and the productivity deteriorates. If the melt flow index ratio is more than 45, Izod impact strength at room temperature is less than 9 kgfcm / cm.

The ethylene alpha olefin copolymer (B) is preferably prepared by a metallocene catalyst represented by the following formula (1).

[Chemical Formula 1]

(THI) 2 RMQp

In the above Formula 1, two THI ligands are the same or different from each other and are tetrahydroindenyl or derivatives thereof substituted or unsubstituted by a substituent, and the substituents include phenyl (Ph), benzyl (Bz), naphthyl ), Indenyl (Ind), benzindenyl (BzInd), methyl (Me), ethyl, n-propyl, n- ), and t- butyl (t-Bu), trimethyl silicon group (Me 3 Si), at least one member selected from the group consisting of alkyl, cycloalkyl and halogen, R is to give a three-dimensional rigidity between the two THI ligands An alkylidene group, an alkylenyl group, a germanium group, a silicon group, a siloxane group, an alkylphosphine group or an amine group containing 1 to 20 carbon atoms and M is a Group IIIB, IVB, VB or VIB Q is a hydrocarbyl group having 1 to 20 carbon atoms or halogen and P is 1-4.

As the metallocene catalyst Et (THI) 2 ZrCl 2, Me 2 Si (THI) 2 ZrCl 2, Me 2 Si (2-MeTHI) 2 ZrCl 2, Et (2-MeTHI) 2 ZrCl 2, Me 2 Si ( 2-Me, 4-PhTHI) 2 ZrCl 2, Et (2-Me, 4-PhTHI) 2 ZrCl 2, Me 2 Si (2-Me, 4-NaphTHI) 2 ZrCl 2, Et (2-Me, 4- NaphTHI) 2 ZrCl 2, Me 2 Si (2-Me, 4,5-BzIndTHI) 2 ZrCl 2, and Et (2-Me, 4,5- BzIndTHI) 2 ZrCl 2 , but can be more than one kinds selected, etc., whereby only It does not.

The metallocene catalyst may be used as a supported catalyst supported on a support. The carrier may be a solid or particulate porous or inorganic material, for example, an oxide of silicon or aluminum, and preferably the carrier is an inorganic material of spherical particles, such as spherical particles obtained by spray drying ≪ / RTI > The support of the metallocene catalyst is carried out by reacting the carrier with a mixture of metallocene and methylaluminoxane according to a general method known in the art. The molar ratio of aluminum to transition metal in the metallocene is preferably 100: 1 to 300: 1. The supporting reaction temperature is preferably 80 ° C to 120 ° C. The reaction time is preferably 1 hour to 2 hours.

The silica is suspended in the hydrocarbon solution. To produce an activated catalyst, a metallocene catalyst component is reacted with a methylalumoxane solution to prepare a solution of the corresponding metallocene cation and anionic methyl alumoxane oligomer. The resulting solution is added dropwise to the silica suspension solution, the mixture is heated and heated for a predetermined time to carry out the reaction. Thereafter, the reaction mixture is cooled to room temperature, washed three times with a hydrocarbon solution under nitrogen, and dried to complete the supported catalyst.

As the cocatalyst, an alkyl aluminum compound, aluminoxane, modified aluminoxane, aluminate salt, neutral ionizing activator, ionic ionizing activator, non-coordinating anion, non-coordination A Group 13 metal, a metaloid anion, a borane compound, and a borate salt. The cocatalyst may be used in a molar ratio of 100 to 1000 with respect to the transition metal of the metallocene catalyst. Hydrogen may be used to control the melt index of the polymer during the polymerization, in which case the molar ratio to ethylene is 0.0001 to 0.001 and the molar ratio to ethylene is 0.001 to 0.02 for density control. The comonomer may be an alpha-olefin monomer having 2 to 20 carbon atoms. The gas phase polymerization temperature in the above-mentioned esterification layer reactor is preferably 70 to 80 占 폚. The operating pressure in the fluidized bed reactor may preferably be 10 to 30 atm.

In the present invention, 0.01 to 0.5 parts by weight, preferably 0.05 to 0.2 parts by weight, and 0.01 to 0.3 parts by weight, preferably 0.05 to 0.2 parts by weight of an antioxidant may be further added to 100 parts by weight of the total amount of the polyethylene resin composition .

If the content of the antioxidant is less than 0.01 parts by weight, discoloration during storage and viscosity change during processing may occur. If the content of the antioxidant is more than 0.5 parts by weight, there may be a problem that the taste and odor are deteriorated.

If the content of the neutralizing agent is less than 0.01 parts by weight, discoloration and viscosity change during processing may occur. If the amount of the neutralizing agent is more than 0.3 parts by weight, changes in physical properties such as color and strength may occur.

Representative examples of the antioxidant include 1,3,5-trimethyl-2,4,6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) benzene (1,3,5- , 4,6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) benzene, 1,6-bis [3- (3,5- (3,5-di-tert-butyl-4-hydroxyphenyl) propionamido] hexane), 1,6-bis [3- Butyl-4-hydroxyphenyl) propionamido] propane), tetrakis [methylene (3,5 4-hydroxyhydrocinnamate)] methane), bis (2,6-di-tert-butyl-4-hydroxyhydrocinnamate) Di-tert-butyl-4-methylphenyl) pentaerythritol-di-phosphite), bis (2,4-di-tert- butylphenyl) pentaerythritol- (2,4-di-tert-butylphen yl) pentraerythritol-di-phosphite).

Representative examples of the neutralizing agent may include calcium stearate, zinc stearate, magnesium aluminum hydroxycarbonate, zinc oxide, magnesium hydroxystearic acid, or a mixture thereof.

The polyethylene resin composition according to the present invention can be used for general bottle lid manufacturing molding methods such as compression and injection molding.

Hereinafter, the present invention will be described in detail by way of examples. However, these embodiments are for illustrative purposes only, and the present invention is not limited thereto.

The measurement methods of physical properties in each of the examples and comparative examples are as follows.

MI ( Melt flow index )

Lt; RTI ID = 0.0 > 190 C < / RTI > according to ASTM D1238.

MFRR (Melt Flow Rate Ratio, Melt flow index ratio )

MI 21.6 (21.6 kg load, melt flow index at 190 캜) / MI 2.16 (2.16 kg load, melt flow index at 190 캜)

density

Measured according to ASTM D1505.

ESCR ( Environmental stress cracking resistance )

It was measured according to ASTM D1693 Condition B. As a test solution, a 10% by weight aqueous solution of Igepal CO630 manufactured by Sigma Aldrich was used and the time at which the probability of occurrence of cracks due to environmental stress became 50% (hereinafter referred to as F50) was calculated.

SFL ( Spiral Flow  Length)

The molding machine used was the SI180III-F200 model manufactured by Toyo Co., Ltd. The mold was Arcimedes spiral type having a width of 10 mm, a thickness of 2 mm, and a maximum length of 2000 mm, and an injection pressure of 1000 kgf / cm 2 , an injection temperature of 235 ° C., an injection speed of 30 mm / Lt; 0 > C and a cooling time of 10 seconds.

FM ( Flexural modulus )

ASTM-4 Specimen Specification, aged for 48 hours, and measured according to ASTM D790.

Izod  impact strength ( Izod  Impact strength)

ASTM-4 Specimen Specification, aged for 48 hours, and then measured at 23 DEG C according to ASTM D256.

Table 1 shows mixing conditions and physical properties in Examples and Comparative Examples of the present invention.

Example  One

The ethylene alpha-olefin copolymer (A) and the ethylene alpha olefin copolymer (B) of Table 1 were granulated in the form of pellets using a twin screw extruder after 250 ppm of Irganox 1010, 500 ppm of Irganox 1010 and 1000 ppm of calcium stearate, Table 1 shows the physical properties of the granulated resin mixed composition.

Example  2 to 7, Comparative Example  1 to 6

The ethylene alpha-olefin copolymer (A) and the ethylene alpha olefin copolymer (B) of Tables 1 and 2 were granulated in the form of pellets using a twin-screw extruder under the same conditions as those of the antioxidant and neutralizer. The physical properties of the resin-mixed resin composition thus formed are shown in Tables 1 and 2.
Example One 2 3 4 5 6
Component A

catalyst Z-N Z-N Z-N Z-N Z-N Z-N MI
(g / 10 min) 5.1 5.1 5.1 5.1 9.1 9.1 MFRR 35 35 35 35 35 35 Density
(g / cm 3) 0.961 0.961 0.961 0.961 0.965 0.965
Component B

catalyst Met. Met. Met. Met. Met. Met. MI
(g / 10 min) 1.0 1.0 1.0 3.5 3.5 3.5 MFRR 28 28 25 24 27 27 Density
(g / cm 3) 0.912 0.912 0.903 0.904 0.912 0.912
mixture





Component A / Component B
(wt / wt) 95/5 90/10 90/10 90/10 90/10 80/20 MI
(g / 10 min) 4.8 4.4 4.1 4.7 7.4 6.8 MFRR 35 34 34 34 34 34 Density
(g / cm3) 0.959 0.956 0.955 0.955 0.960 0.954 ESCR
(F50, hr) 13 58 111 103 14 76 SFL
(cm) 77.3 75.5 73.8 83.0 93.1 88.3 Flexural modulus
(kgf / cm 2 ) 9,800 8,800 8,800 8,700 10,300 8,200 Izod impact strength
kgfcm / cm 9.3 12.7 20.1 17.6 9.0 12.7



Comparative Example One 2 3 4 5 6 7
Component A

catalyst Z-N Z-N Z-N Z-N Z-N Z-N Z-N MI
(g / 10 min) 5.1 5.1 5.1 5.1 5.1 5.1 7.3 MFRR 35 35 35 35 35 35 35 Density
(g / cm 3) 0.961 0.961 0.961 0.961 0.961 0.961 0.960
Component B

catalyst - Z-N Met. Met. Met. Met. - MI
(g / 10 min) - 1.0 1.0 5.0 5.0 1.0 - MFRR - 32 36 26 26 28 - Density
(g / cm 3) - 0.919 0.922 0.870 0.870 0.912 -
mixture





Component A / Component B
(wt / wt) 100/0 90/10 90/10 95/5 90/10 97.5 / 2.5 100/0 MI
(g / 10 min) 5.1 4.4 4.4 5.0 4.9 4.9 7.3 MFRR 35 34 36 35 36 35 35 Density
(g / cm 3) 0.961 0.957 0.957 0.956 0.952 0.960 0.960 ESCR
(F50, hr) 5 6 22 9 15 7 4 SFL
(cm) 80.1 75.5 76.1 79.1 80.4 78.2 93.0 Flexural modulus
(kgf / cm 2 ) 10,200 9,000 9,100 8,800 7,400 10,100 10,000 Izod impact strength
kgfcm / cm 7.1 7.2 7.2 14.9 67.2 8.6 6.5

The polyethylene resin compositions corresponding to Examples 1 to 4 of the present invention were prepared by mixing 5 to 20% by weight of the ethylene alpha olefin copolymer (B) of Table 1 in the same ethylene alpha olefin copolymer (A) as in Comparative Example 1, It can be confirmed that the Izod impact strength and ESCR at room temperature compared to Comparative Example 1 were increased with one resin composition.

In addition, it can be confirmed that Examples 3, 4 and 5, in which the density of the ethylene alpha-olefin copolymer (B) is relatively low, have increased Izod impact strength and ESCR property at room temperature on the basis of the same density or flexural modulus. However, when the ethylene alpha-olefin copolymer (B) was polymerized with a Ziegler-Natta (ZN) catalyst as in Comparative Example 2, the ESCR and the Izod impact strength at room temperature were not improved and the ethylene alpha olefin copolymer (B) Is 0.920 or more, the ESCR property is improved, but the Izod impact strength at room temperature is not improved. When the density is less than 0.900 as in Comparative Example 4, phase separation between the ethylene alpha olefin copolymer (B) and the ethylene alpha olefin copolymer (A) occurs and the ESCR is relatively small at less than 10 hours, Of ethylene alpha olefin copolymer (B) is mixed at 10% by weight, the flexural modulus of elasticity is lowered to less than 8000, which causes a problem of mechanical strength deterioration. Even when the ethylene alpha olefin copolymer (B) was mixed with the ethylene alpha olefin copolymer (B) in the same manner as in Comparative Example 6, when the weight percentage of the ethylene alpha olefin copolymer (B) was less than 5 wt%

In the case of Example 5 of the present invention, the Izod impact strength and ESCR property of the resin mixed composition at room temperature were similar to those of Comparative Example 7 having a density of similar MI without the ethylene alpha-olefin copolymer (B) ESCR, Izod impact strength at room temperature. Also, Example 6 of the present invention exhibited an ESCR of 80 hours or more and an Izod impact strength of 10 or more at room temperature while having a flexural modulus of 8000 or more and an SFL of 85 or more.

In addition, the embodiment of the present invention satisfies all of the requirements that the ESCR is 10 hours or more, the Izod impact strength at room temperature is 9 kgfcm / cm or more, the flexural modulus is 8,500 kgf / cm 2 or more, and the spiral flow length is 65 cm or more, And a polyethylene resin composition which is advantageous for thinning.

Claims (14)

A melt flow index ratio (MI21.6 / MI2.16) of 0.950 to 0.970 g / cm < 3 > polymerized with a Ziegler-Natta catalyst, a melt flow index of 0.8 to 10 g / 10 min at 190 DEG C, 2.16 kg of ASTM D1238, 80 to 95% by weight of an ethylene alpha olefin copolymer (A) having an ethylene content of 25 to 40; And
And a density in the polymerization the metallocene catalyst 0.900 g / cm 3 greater than 0.920g / cm less than 3, a melt flow index of 0.5 ~ 5g / 10min at 190 ℃, 2.16kg of ASTM D1238, a melt flow index ratio (MI21. 5 to 20% by weight of an ethylene-alpha-olefin copolymer (B) having a number-average molecular weight (Mw / Mn)
Wherein the polyethylene resin composition has a spiral flow length of 65 cm or more, a flexural modulus of 8,500 kgf / cm 2 or more, and an Izod impact strength at room temperature of 9 kgfcm / cm or more. The method according to claim 1,
Wherein the melt flow index of the polyethylene resin composition is 0.5 to 15 g / 10 min at 190 占 폚 and 2.16 kg of ASTM D1238. The method according to claim 1,
Wherein the polyethylene resin composition has a density of 0.950 to 0.965 g / cm < 3 >. The method according to claim 1,
Wherein the polyethylene resin composition has a melt flow index ratio (MI21.6 / MI2.16) of 25 to 45. The method according to claim 1,
Wherein the polyethylene resin composition has an environmental stress cracking resistance (ESCR) of 10 hours or more. delete delete delete The method according to claim 1,
The ethylene alpha-olefin copolymer (B) has a composition distribution breadth index (CDBI) as measured by Crystallization Analysis Fractionation (CRYSTAF) of the copolymer contained within 50% of the molar percentage at 50% (% By weight) is 85 to 95%. The method according to claim 1,
Wherein the metallocene catalyst is a polyethylene resin composition for a bottle cap having a structure represented by the following Formula 1:
[Chemical Formula 1]
(THI) 2 RMQp
In Formula 1,
The two THI ligands are the same or different from each other and are tetrahydroindenyl or a derivative thereof substituted or unsubstituted by a substituent,
The substituent may be selected from the group consisting of phenyl (Ph), benzyl (Bz), naphthyl, indenyl, benzindenyl, methyl, ethyl, n- (i-Pr), n-butyl, t-butyl, trimethylsilicon group (Me 3 Si), alkoxy, cycloalkyl and halogen And R is a structural bridge that gives steric rigidity between two THI ligands and is an alkylidene group, an alkylenyl group, a germanium group, a silicon group, a siloxane group, an alkylphosphine group, or an alkylene group containing 1 to 20 carbon atoms An amine group,
M is a transition metal of Group IIIB, Group IVB, Group VB or Group VIB,
Q is a hydrocarbyl group having from 1 to 20 carbon atoms or halogen,
p is 1 to 4; The method according to claim 1,
0.01 to 0.5 part by weight of an antioxidant and 0.01 to 0.3 part by weight of a neutralizing agent based on 100 parts by weight of the polyethylene resin composition. 12. The method of claim 11,
Wherein the antioxidant is 1,3,5-trimethyl-2,4,6-tris (3,5-di-tert-butyl-4-hydroxybenzyl) Bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionamido] -6- Bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionamido] hexane, 1,6- (3,5-di-tert-butyl-4-hydroxyphenyl) propionamido] propane), tetrakis [methylene (3,5- tert-butyl-4-hydroxyhydrocinnamate)] methane), bis (2,6-di-tert-butyl- (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol-di-phosphite) and bis (2,4-di-tert- butylphenyl) pentaerythritol Wherein the polyethylene resin is at least one selected from bis (2,4-di-tert-butylphenyl) pentraerythritol-di-phosphite Composition. 12. The method of claim 11,
Wherein the neutralizing agent is calcium stearate, zinc stearate, magnesium aluminum hydroxycarbonate, zinc oxide, magnesium hydroxystearic acid, or a mixture thereof. A molded article produced from the polyethylene resin composition according to any one of claims 1 to 5 and 9 to 13.
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