JPH09124856A - Resin composition for extrusion lamination - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a polyolefin resin composition having balanced low-neck-in tendency and good moldability to suppress the emission of smoke and odor and the generation of stain on a roll and exhibiting excellent low-temperature sealability, heat-sealing strength and hot-tackiness. SOLUTION: This resin composition is composed of (A) 60-85wt.% of an ethylene-olefin copolymer having an MFR of 5.0-30g/10min and a density of 0.870-0.935g/cm<3> and (B) 40-15wt.% of a high-pressure-produced low-density polyethylene having an MFR of 0.10-2.0g/10min, a density of 0.915-0.930g/cm<3> and a g-value g=[η]L/[η]B} of 0.5-0.90 wherein [η]L is intrinsic viscosity of a straight-chain low-density polyethylene having a weight-average molecular weight (determined by light-scattering) equal to that of this polyethylene and [η]B is the intrinsic viscosity of this polyethylene. The composition has a J-value of >=2×10<-5> Pa<-1> determined by the measurement of viscoelasticity, an MFR of 1,0-25g/10min and a density of 0.870-0.935g/cm<3> .

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention provides all of the moldability that enables high-speed molding, thin-wall molding, low neck-in, etc., and low-temperature heat-sealing property, heat-sealing strength and hot-tacking property, which contradict each other in terms of performance. It relates to a satisfied polyolefin resin composition.

[0002]

2. Description of the Related Art Polyethylene has excellent extrudability and moldability, and also has excellent heat-sealing property and moisture-proof property, so that it can be used as a film alone or in various resin films, paper,
It is used in large quantities in the field of packaging materials as a laminate obtained by extrusion laminating a base film such as aluminum foil. Dry laminating method for resin laminating
Although there are wet laminating method and extrusion laminating method, extrusion laminating method is often used for polyethylene. In this method, a resin is plasticized by using an extruder, and a film extruded is directly coated on a base material, and a polyethylene film is molded and bonded to a base material film at the same time.

At the time of this hot tacking, it is required to improve the high-speed formation and the thin-wall moldability in order to reduce the productivity and the cost, so that the MFR of the resin is increased or the molding temperature is raised to enhance the fluidity of the resin. Many such means are adopted. For example, the molding temperature at the time of general extrusion lamination molding of polyethylene is a high temperature of 300 to 330 ° C. This is necessary in order to improve the fluidity of the resin and to achieve high-speed formation and thin-wall moldability, but on the other hand, there are problems such as oxidative deterioration of the laminated resin due to high temperature, smoke generation during molding, and generation of odor. For example, oxidative deterioration due to high temperature may cause a decrease in heat seal strength, and smoke may cause stains on the roll, thus contaminating the product.
The generation of odors has a negative impact on the value of the product, especially in the case of food packaging materials. Although it is effective to lower the molding temperature in order to solve such a problem, it goes without saying that high-speed moldability and thin-wall moldability are deteriorated.

On the other hand, by increasing the MFR of the resin, molding at low temperature becomes possible. When molding at 270 to 290 ° C., sufficient high-speed moldability can be obtained by using polyethylene having an MFR of about 20 g / 10 min. However, increasing the MFR of the resin in this manner not only causes a decrease in heat seal strength and impact strength of the product, but also deteriorates the neck-in property.

A method for achieving both high-speed moldability and low neck-in property is disclosed in JP-A-58-194935.
There is a method of blending a high-pressure low-density polyethylene and a linear low-density polyethylene proposed in Japanese Patent Publication. It has been found that this method not only improves the moldability as compared with high-pressure low-density polyethylene alone, but also improves the physical properties of the product such as low-temperature heat-sealing property and hot-tack property. Further, according to JP-A-7-26079, when a linear low-density polyethylene produced by using a metallocene catalyst is used instead of the linear low-density polyethylene used in the blend, a better molding is obtained. It is possible to produce a polyolefin resin composition exhibiting properties and product properties. However, with these methods, the balance of high-speed moldability and low neck-in property has reached a sufficiently satisfactory level in molding in the low temperature range where smoke generation, odor generation, film oxidative deterioration prevention, and roll stain prevention can be prevented. It was impossible to do.

[0006]

DISCLOSURE OF THE INVENTION The present invention has a moldability and a low neck-in so that no smoke or odor is generated during the molding process, the stain on the roll is small, and the oxidative deterioration of the produced film is small. It is an object of the present invention to provide a polyolefin resin composition which has a good balance of properties and which is excellent in low-temperature heat sealability, heat seal strength and hot tack of the obtained film.

[0007]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have found that a specific polyolefin resin composition has high moldability at a relatively low temperature of 280 ° C. or lower, It was found that the product showed low neck-in property and the obtained product also had low-temperature heat-sealing property, heat-sealing strength and hot-tack property. That is, (A) MFR is 5.0 to 30 g / 10 minutes, density is 0.870 to 0.935 g / cm ³ ethylene-olefin copolymer ... 60 to 85% by weight (B) MFR is 0. 10 to 2.0 g / 10 min, density 0.915 to 0.930 g / cm ³ , weight average molecular weight measured by light scattering method is the same as this polyethylene. ] High-pressure low-density polyethylene having a ratio g of intrinsic viscosity [η] _B of _L and the present polyethylene, and a value of g = [η] _L / [η] _B of 0.5 to 0.90 ... 40 A resin composition consisting of ˜15% by weight, having a J value of 2 × 10 ⁻⁵ Pa ⁻¹ obtained by dynamic viscoelasticity measurement.
As described above, the above object was achieved by providing a resin composition for extrusion lamination having an MFR of 1.0 to 25 g / 10 minutes and a density of 0.870 to 0.935 g / cm ³ . In that case, in the ethylene-olefin copolymer, the maximum melting point peak (Tm) and the density (d) in DSC are | Tm | <583 × d (g / cm ³ ) −4.
18 and the molecular weight distribution measured by GPC (M _W / M _n ).
[However, M _w : weight average molecular weight, M _n : number average molecular weight]
It was also found that the resin composition for extrusion laminating according to claim 1 is preferably 3.0 or less.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The polyolefin resin composition of the present invention can be produced by blending a specific ethylene-olefin copolymer with a special high-pressure low-density polyethylene. That is, the polyolefin resin composition of the present invention is an ethylene-olefin copolymer (A) 6
0-85% by weight, high pressure method low density polyethylene (B) 4
It is composed of 0 to 15% by weight, and each of these polymers is required to have the following characteristics.

(A) Ethylene-Olefin Copolymer The ethylene-olefin copolymer is (1) MFR 5.0 to 30 g / 10 min (2) Density 0.870 to 0.935 g / cm ^3. . The olefin to be used for the copolymerization of the ethylene-olefin copolymer used in the present invention is α-C3-18.
It is an olefin. Propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1
-Decene, 4-methylpentene-1, cyclopentene,
Olefins such as cyclopentadiene, cyclohexene, cyclohexadiene, butadiene, 1,5-hexadiene, 1,4-hexadiene, and 1,4-pentadiene,
They are cyclic olefins and dienes. Among these, it is advantageous to use an α-olefin having 4 to 8 carbon atoms in order to achieve both economical efficiency and physical properties. Among them, 1-butene, 1-hexene, and 1-octene are preferable. These olefins can be used in combination of two or more kinds.

The compounding ratio of these olefin and ethylene in the polymer is not particularly limited, but ethylene-ethylene is preferred.
The molar ratio of olefin is 10,000 to 0.5, and more preferably 1000 to 10. The ethylene-olefin copolymer used in the present invention is JIS K-72.
10 MFR measured under Table 1, Condition 4 is 5.0 to
30g / 10min, preferably 10-29g / 10m
It is in the range of in. MFR is 30g / 10m
If it is larger than in, the amount of smoke generated during the molding process increases, and the tendency of stains on the cooling roll increases, which is not preferable. When the MFR is less than 5.0 g / 10 min, not only the drawdown property during the molding process is deteriorated, but also the motor load of the extruder becomes large, and practical extrusion laminate molding tends to be difficult.

The ethylene-olefin copolymer used in the present invention has a density of 0.870 according to JIS K-7112.
-0.935 g / cm < ³ >, preferably 0.880-0.
925 g / cm ³ , more preferably 0.890 to 0.9
It is in the range of 21 g / cm ³ . Density 0.9
When it exceeds 35 g / cm ³ , the low temperature heat sealability is deteriorated. If the density is less than 0.870 g / cm ³ , stickiness may occur on the film surface, or the stickiness may cause a poor appearance, which significantly impairs the practicability as a product. Among the ethylene-olefin copolymers of the present invention, the temperature (Tm) at the maximum peak position of the melting point in differential scanning calorimetry (DSC) and the density (d) expressed in g / cm ³ are: | Tm | < 583 × d−418, preferably | Tm | <700 × d−528, and the molecular weight distribution (Mw / M) measured by gel permeation chromatography (GPC).
It is preferable that n; Mw = weight average molecular weight, Mn = number average molecular weight) is 3.0 or less.

The ethylene-olefin copolymer used in the present invention may be polymerized by a method of copolymerizing ethylene and olefin using an ordinary Ziegler catalyst described in Japanese Patent Publication No. 56-18132. However, JP-A-58-19309, European Patent Application Publication No. 420436, and US Pat. No. 5,055,438.
And a method using a metallocene catalyst described in WO 91/04257 and the like,
Alternatively, ethylene and an olefin are copolymerized using a catalyst composed of a composition composed of a compound which reacts with a metallocene compound and a metallocene compound to form a stable anion as described in WO92 / 01723 and the like. It may be polymerized by a method. Further, in the metallocene compound catalyst system, JP-A-60-130
As described in JP-A No. 604 and JP-A No. 60-260602, a cocatalyst composed of methylaluminoxane and another organoaluminum compound may be used to increase the polymerization activity per mole of aluminum. . The organoaluminum compound used at this time is not particularly limited, but preferably trialkylaluminum,
More preferred are triisobutylaluminum, trimethylaluminum, and trioctylaluminum.

Examples of the method for producing these copolymers include a slurry method, a gas phase method, a solution method, and high pressure ionic polymerization. Among them, those manufactured by the slurry method as described in JP-A-6-87922 are preferable.

(B) High pressure low density polyethylene As high pressure low density polyethylene, (1) MFR
0.1-2.0 g / 10 min, (2) Density 0.91
5 to 0.930 g / cm ³ , (3) the linear viscosity of the low-density polyethylene (B) whose weight average molecular weight measured by the light scattering method is the same as that of the high-pressure method low-density polyethylene (B) [η] _L , and high pressure It is necessary that the ratio of intrinsic viscosity [η] _B of the method low density polyethylene (B) and the value of g of g = [η] _L / [η] _B be 0.55 to 0.90.

This high-pressure low-density polyethylene is manufactured by JIS
K-7210 It is preferable that the MFR measured under the condition 4 in Table 1 is in the range of 0.1 to 2.0 g / 10 min, preferably 0.25 to 1.0 g / 10 min. If this MFR is greater than 2.0 g / 10 min, neck-in during laminate molding becomes large and molding processability deteriorates. When the MFR is less than 0.1 g / 10 min, the dispersibility becomes poor in the melt-kneading with the ethylene-olefin copolymer as the component (A), resulting in poor appearance such as fish eyes in the laminate.
The high-pressure low-density polyethylene used in the present invention is JIS
The density according to K-7112 is 0.915 to 0.930 g /
It is in the cm ³ range. Density is 0.930 g / cm
^When larger than ³ , the low temperature heat seal becomes poor. On the other hand, when the density is less than 0.915 g / cm ^{3, the} film surface becomes sticky or causes a poor appearance, thus reducing the practicality.

The high-pressure low-density polyethylene used in the present invention may be one produced by a general autoclave or a tubular reactor, but the high-pressure low-density polyethylene obtained by using either reactor has a long-chain branched structure. It is well known that the number and length of long chain branches vary depending on the pressure and temperature during polymerization. JP 4
No. 8743, the degree or number of long-chain branches is such that the intrinsic viscosity of linear low-density polyethylene [η with a weight-average molecular weight measured by dilute solution light scattering method is the same as that of polyethylene with long-chain branches [η ] The ratio of _L and the intrinsic viscosity [η] _S of polyethylene having long-chain branching, g = [η]
It can be represented by _S / [η] _L. Intrinsic viscosity [η]
_S and the intrinsic viscosity [η] _L were determined at a point (η _SP / c) _C → ₀ extrapolated from a dilute solution of tetralin at 130 ° C to zero concentration. The high pressure low density polyethylene used in the present invention is
The intrinsic viscosity ratio g is in the range of 0.55 to 0.90, preferably 0.65 to 0.80. g is 0.
If it is less than 55, the drawdown property during molding is deteriorated, which is not preferable.

(C) Resin Composition The blending ratio of the ethylene-olefin copolymer of the component (A) and the high-pressure low-density polyethylene of the component (B) constituting the polyolefin resin composition of the present invention is the same as that of the component (A). Is 6
0 to 85% by weight, and component (B) is 40 to 15% by weight. If the compounding ratio of the component (B) is less than 15% by weight, neck-in becomes large at the time of laminate molding, an improvement effect on the moldability is not observed, or surging occurs and molding cannot be performed. Further, when the blending ratio of the component (B) is more than 40% by weight, sufficient drawdown property is not obtained during laminate molding, high-speed moldability is deteriorated, and heat-sealing property and hot tack property of the obtained laminate molded product are obtained. Etc. worsens.

The polyolefin resin composition of the present invention comprises the ethylene-olefin copolymer of component (A) and component (B).
It can be produced by blending the low-pressure polyethylene of the high-pressure method. That is, a polyolefin resin composition is obtained by a method of melt-kneading components (A) and (B) in a predetermined ratio using a single-screw extruder, a twin-screw extruder, a Brabender, a Banbury mixer, a kneader blender or the like. be able to. A method in which a molten strand is extruded using a single-screw extruder or a twin-screw extruder, cooled and solidified in water and cut with a cutter, and used as pellets is simple and preferable.

The polyolefin resin composition of the present invention thus obtained has a J value of 2.0 × 10 ^-5 Pa ^-1 or more obtained by dynamic viscoelasticity measurement, and JIS K-7
210 MFR measured under Table 1, condition 4 (test temperature 190 ° C., test load 2.16 kgf) is 1.0 to 2
5g / 10min, preferably 2.0-20g / 10m
in, more preferably 2.4 to 15 g / 10 min, and have a density of 0.8 measured according to JIS K-7112.
70 to 0.935 g / cm ³ , preferably 0.880 to
0.925 g / cm ³ , more preferably 0.890-
It is 0.921 g / cm ³ .

The above J value is obtained by calculating as follows by measuring the frequency dependence of viscosity at a measurement temperature of 190 ° C. using a parallel plate type dynamic viscoelasticity measuring device. Journal of Colloida
l Science 1965 Volume 20, pp41
7 to 437, the frequency dependence of viscosity can be generally expressed by the following equation. M. C
reported by Ross. η = η ₀ [1+ (τγ) ^1-n ] ^-1 ... (a) where η, η ₀ , τ, γ and n are viscosity, zero shear viscosity, relaxation time, shear rate and power, respectively. Indicates the low index. Based on this, the frequency dependence of the viscosity can be calculated according to the above (a)
Curve fitting is performed so as to fit the equation, and η ₀ and τ are obtained. The J value is defined by J value = τ / η ₀ , and the larger the J value, the lower the neck-in property. If this J value is smaller than 2.0 × 10 ⁻⁵ Pa ⁻¹ , neck-in becomes large during laminate molding, which is not preferable. If the MFR is less than 1.0 g / 10 min, the drawdown property is deteriorated, and if it is more than 25 g / 10 min, the neck-in is deteriorated. Further, the density is 0.870 g / c
When it is less than m ³ , stickiness may occur on the film surface, and this stickiness causes poor appearance. When the density is higher than 0.935 g / cm ³ , the low temperature heat-sealing property and the hot tack property of the laminate molded product deteriorate.
The polyolefin resin composition of the present invention optionally contains an antioxidant that is generally used for resin compositions,
Stabilizers, lubricants, antistatic agents, ultraviolet absorbers, antiblocking agents, pigments and other additives may be added.

As a substrate for extrusion laminating the polyolefin resin composition of the present invention, high density polyethylene, medium / low density polyethylene, polypropylene, polystyrene, polyamide, polyester, ethylene-vinyl acetate copolymer, polyvinyl alcohol. , Ethylene-
Vinyl alcohol copolymer, resin film or sheet such as polycarbonate, metal foil or plate such as aluminum, iron, copper, or alloys containing these as main components, cellophane, paper, cloth, woven cloth, non-woven cloth, etc. You can In order to improve the adhesive strength between the polyolefin resin composition of the present invention and the base material, corona discharge treatment, flame treatment, ozone treatment, or other treatment may be performed on the surface of the base material, if necessary. An adhesive may be interposed between the base materials.

As an apparatus for extrusion laminating the polyolefin resin composition of the present invention, an ordinary T-die type apparatus can be used. The thickness of the laminate is not particularly limited and may be appropriately selected depending on the purpose. The polyolefin resin composition of the present invention is used for extrusion laminating on at least one surface of a substrate. Further, it is not limited to the case where one layer of the resin composition is extrusion-laminated on one side of the substrate, and two or more layers may be extrusion-laminated on one side of the substrate using a multilayer T-die extruder. In that case, whether to use the resin composition for the outermost layer or the inner layer may be selected according to the intended use of the product.

[0023]

【Example】

(Examples 1 to 3, Comparative Examples 1 and 2) The ethylene-olefin copolymer as the component (A) was produced by the following method. The catalyst was prepared in a 300 ml flask with sufficient nitrogen substitution.
1.0 g of silica calcined at 00 ° C. for 4 hours and 0.50 of slurry aluminoxane manufactured by Toso-Akzo Co., Ltd.
mg and toluene 50 ml were added, and then triethyl phosphate 7.9 mg was added, and the mixture was heated and stirred at 80 ° C. for 2 hours. Next, a stainless steel stirring autoclave type reactor having an internal volume of 6 liters, which had been sufficiently replaced with nitrogen, was charged with 9.6 ml of an n-hexane solution of triisobutylaluminum (0.5 mol / ml) and bis (n-butylcyclopenta). 35 ml of an n-hexane solution of dienyl) zirconium dichloride (0.4 mg / ml), and the washed addition reaction product prepared above with toluene were washed with 45 ml.
Polymerization was started by introducing 0 mg and 3.2 liters of isobutane and then introducing ethylene. Ethylene pressure 1
At 0 kg / cm ² , 70 ° C., 300 g of 1-hexene was introduced together with ethylene for polymerization, and after completion of the reaction, M
FR is 29g / 10min, density is 0.882g / cm
³ ethylene - give the olefin copolymer.

The temperature (Tm) of the maximum peak position of the melting point in the differential scanning calorimetry (DSC) of the ethylene-olefin copolymer of the component (A) is DS by Perkin Elmer.
Using C-7, pack about 5 mg of sample in an aluminum pan,
The temperature is raised to 180 ° C. at 10 ° C./min, held at 180 ° C. for 5 minutes, lowered to 30 ° C. at 10 ° C./min, then kept at 30 ° C. for 5 minutes, and then raised to 10 ° C./min. It was determined from the endothermic curve at that time. Component (A) ethylene-
The molecular weight distribution (Mw / Mn; Mw = weight average molecular weight, Mn = number average molecular weight) in olefin gel permeation measurement is 150C ALC / G manufactured by Waters Corporation.
It measured using PC. Also, as a column, SHOWDEX HTSHODEX HT806M was used. 1,2,4-trichlorobenzene was used as the solvent, and the flow rate was 1.0.
It was measured at 140 ° C. at ml / min.

The component (B) high-pressure low-density polyethylene has an MFR of 0.38 g / 10 min and a density of 0.92.
Syorex M040 manufactured by Showa Denko KK having a ratio of 1 g / cm ³ and an intrinsic viscosity of 0.75 was used. Ratio (g) of intrinsic viscosity of high-pressure low-density polyethylene of component (B)
Was determined by measuring the intrinsic viscosities [η] _B and [η] _L with a dilute solution of tetralin at 130 ° C. according to the method described in JP-A-4-8743.

The above components (A) and (B) were blended in the proportions shown in Tables 1 and 2, and pellets of a polyolefin resin composition were produced using a single-screw extruder having the following specifications.
Screw diameter 30 mmφ, effective screw length (L / D)
20, using a full flight type screw with a screw compression ratio of 3.0, the molten strand is extruded at a screw rotation speed of 60 rpm and a resin temperature of 190 ° C., solidified in a cooling water tank of 30 ° C., and then cut into pellets with a cutter. did.
A disk-shaped sample was press-molded using the pellets of the obtained polyolefin resin composition, and the frequency dependence of the viscosity was measured at a preset temperature of 190 ° C. using a RMS-800 mechanical spectrometer manufactured by Rheometrics. . The measurement frequency range is 10 ^-2 to 10 ² rad / sec,
Parallel plates were used. The obtained data was subjected to curve fitting so as to meet the above-mentioned formula (a), and the zero shear viscosity and relaxation time were obtained and the J value was calculated. The obtained polyolefin resin composition pellets were extruded into a film having a film thickness of 20 μm at a molding temperature of 280 ° C. using a 50 mmφ single-screw extruder, and the extruded product had a width of 320 mm and a lip width of 5
Extrusion laminate molding was performed on a substrate (biaxially stretched nylon film) having a thickness of 35 μm from a T-die of mm. Using this laminated molding film, heat seal strength, minimum heat seal temperature, and hot tack property were measured.

In the same manner as above, kraft paper was used as the substrate, and the polyolefin resin composition was extrusion-laminated at a film thickness of 20 μm, and the drawdown property and neck-in were measured. Drawdown property is 80 screw speed
The maximum winding speed was such that extrusion laminating was carried out at rpm and the winding speed was increased to achieve stable molding. Neck-in is extrusion-laminated at a screw rotation speed of 120 rpm and a winding speed of 120 m / min.
The effective width of the die L _0, the width of the coated film to kraft paper at the time of the L _1, the value of L ₀ -L _1. The moldability evaluation results are shown in Tables 1 and 2. The heat-sealing strength was obtained by combining the polyethylene layers of the two above-mentioned molded films cut into a width of 15 mm, and using a heat sealer manufactured by Tester Sangyo Co., Ltd., at a sealing temperature of 110
C, sealing surface pressure 2.0 kg / cm ² , sealing time 1.
Heat seal with a seal width of 10 mm under the condition of 0 seconds,
The 180 ° peel strength was obtained by using UTM-500 manufactured by Toyo Baldwin Co., Ltd. at a tensile speed of 300 mm / min. The results are shown in Tables 1 and 2.

The minimum heat sealing temperature is 6
The same measurement as the above heat seal strength was performed except that the temperature was raised in steps of 0 ° C to 5 ° C, and the heat seal strength was 2k.
The minimum temperature was set to g or more. The results are shown in Tables 1 and 2. The hot tack property was measured by using a heat sealer manufactured by Tester Sangyo Co., Ltd. in a state where two polyethylene films of the above-mentioned molded films cut into a width of 15 mm were put together, and a load of 23 g was applied to one side of the sample through a pulley. The sealing surface pressure is 2.0 kg / cm ² , and the sealing time is 1.
Heat seal with a seal width of 5 mm and a seal length of 300 mm under the condition of 0 seconds, the load is dropped at the same time as the sealing is finished, and the peeling distance when leaving it until the peeling of the heat-sealed part completely stops is the minimum temperature that does not exceed 150 mm. And The results are shown in Tables 1 and 2. In addition, the appearance of the molded film was visually observed. The results are shown in Tables 1 and 2.

(Examples 4 to 6) Component (A) has an MFR of 1
A laminate molded body was obtained in the same manner as in Example 1 except that an ethylene-olefin copolymer having a density of 0 g / 10 min and a density of 0.880 g / cm ³ was used. Table 1 shows the blending ratio of the component (A) and the component (B), the moldability evaluation result, the physical property evaluation result and the appearance.

(Example 7) A high-pressure low-density polyethylene of component (B) was added to Showa Denko (MFR 0.28 g / 10 min, density 0.920 g / cm ³ and intrinsic viscosity ratio g 0.77). A laminate molded body was obtained in the same manner as in Example 1 except that SHOREX M032 manufactured by Co., Ltd. was used.
Blending ratio of component (A) and component (B), moldability evaluation result,
The results of physical property evaluation and appearance are shown in Table 1.

(Example 8) A high-pressure low-density polyethylene as component (B) was added to Showa Denko, which had an MFR of 0.80 g / 10 min, a density of 0.921 g / cm ³ , and an intrinsic viscosity ratio of 0.70. A laminated molded body was obtained in the same manner as in Example 1 except that the manufactured product Syolex M082 was used. Table 1 shows the blending ratio of the component (A) and the component (B), the moldability evaluation result, the physical property evaluation result and the appearance.

(Examples 9 and 10) An ethylene-olefin copolymer having an MFR of 29 g / 10 min and a density of 0.907 g / cm ^{3 as} the component (A) and an MFR of 29 g / 10.
A laminate molded body was obtained in the same manner as in Example 1 except that an ethylene-olefin copolymer having a min and a density of 0.920 g / cm ³ was used. The blending ratio of the component (A) and the component (B), the moldability evaluation result, the physical property evaluation result and the appearance are shown in Table 1.
It was shown to.

(Comparative Examples 3 and 4) An ethylene-olefin copolymer having an MFR of 1.0 g / 10 min and a density of 0.895 g / cm ^{3 as} the component (A) and an MFR of 50 g / 1.
A laminated molded body was obtained in the same manner as in Example 1 except that an ethylene-olefin copolymer having a density of 0.905 g / cm ³ for 0 min was used. Table 2 shows the blending ratio of the component (A) and the component (B), the moldability evaluation result, the physical property evaluation result and the appearance.

(Comparative Examples 5 and 6) A high pressure low density polyethylene of component (B) was added with MFR of 0.05 g / 10 min,
Density 0.918 g / cm ³ , intrinsic viscosity ratio g 0.7
0 high pressure low density polyethylene and MFR 7.0g /
Syorex L manufactured by Showa Denko KK having a density of 0.920 g / cm ³ and an intrinsic viscosity ratio of 0.68 for 10 min.
A laminated molded body was obtained in the same manner as in Example 1 except that 173 was used. Table 2 shows the blending ratio of the component (A) and the component (B), the moldability evaluation result, the physical property evaluation result and the appearance.

(Comparative Example 7) The component (A) has an MFR of 1.0.
g / 10 min, ethylene-olefin copolymer having a density of 0.895 g / cm ³ and high-pressure low density polyethylene (B) having a MFR of 7.0 g / 10 min, a density of 0.920 g / cm ³ , and an intrinsic viscosity A laminate molded body was obtained in the same manner as in Example 1 except that Showall Denko's SHOREX M173 having a ratio g of 0.68 was used. Table 2 shows the blending ratio of the component (A) and the component (B), the moldability evaluation result, the physical property evaluation result and the appearance.

(Comparative Example 8) Showa Denko (M) having a high pressure low density polyethylene of component (B) having an MFR of 0.30 g / 10 min, a density of 0.921 g / cm ³ , and an intrinsic viscosity ratio of 0.26 ( A laminate molded body was obtained in the same manner as in Example 1 except that SHOREX M030 manufactured by Co., Ltd. was used.
Blending ratio of component (A) and component (B), moldability evaluation result,
The results of physical property evaluation and the appearance are shown in Table 2.

[0037]

As described above, the polyolefin resin composition of the present invention comprises:
The balance between high-speed moldability and low neck-in property during low-temperature molding is remarkably superior to conventional polyolefin resin compositions, and low-temperature heat-sealing property, heat-sealing strength and hot-tack property are good, so it is suitable for soft packaging. Suitable for laminate materials.

[Table 1]

[Table 2]

Claims (2)

[Claims] 1. An ethylene-olefin copolymer having (A) MFR of 5.0 to 30 g / 10 minutes and a density of 0.870 to 0.935 g / cm ³ ... 60 to 85% by weight (B) MFR Is 0.10 to 2.0 g / 10 min, the density is 0.915 to 0.930 g / cm ³ , and the weight average molecular weight measured by the light scattering method is the same as that of the present polyethylene. Ratio of the viscosity [η] _L and the intrinsic viscosity [η] _B of the polyethylene, g = [η] _L / [η] _B , the value of the high pressure method low density polyethylene is 0.5 to 0.90. ··· A resin composition consisting of 40 to 15% by weight, and having a J value of 2 × 10 ⁻⁵ Pa ⁻¹ obtained by dynamic viscoelasticity measurement.
As described above, the resin composition for extrusion lamination having an MFR of 1.0 to 25 g / 10 minutes and a density of 0.870 to 0.935 g / cm ³ . 2. The ethylene-olefin copolymer has a maximum melting point peak (Tm) in DSC and a density (d) of | Tm | <583 × d (g / cm ³ ) -4.
18 and the molecular weight distribution measured by GPC (M _W / M _n ).
[However, M _w : weight average molecular weight, M _n : number average molecular weight]
Is 3.0 or less, The resin composition for extrusion lamination according to claim 1.