JPS59179643A - Extrusion molding resin composition - Google Patents

Abstract

PURPOSE:To provide the titled compsn. having excellent heat-sealability, by melt-mixing low-density PE, an ethylene/alpha-olefin copolymer, a low crystalline to amorphous ethylene/alpha-olefin copolymer and a tackifier. CONSTITUTION:10-60wt% low-density PE (A) having a density of 0.91-0.94g/ cm<3> obtd. by radical polymn. in the presence of a polymn. initiator such as an azo compd. under a reaction pressure of 1,000-3,000atm, 20-70wt% ethylene/ C3-C8 alpha-olefin copolyme (B) having a 3-8C alpha-olefin content of 0.2-8mol%, an MI of 0.5-30g/10min and a density of 0.91-0.95g/cm<3>, 10-50wt% low-crystalline to amorphous ethylene/C3-C4 alpha-olefin copolymer (C) having a 3-4C alpha- olefin content of 5-30mol%, an MI of 0.5-30g/10min and a density of 0.85- 0.90g/ cm<3> and 5-30wt% tackifier (D) such as rosin are melt-mixed together to obtain an extrusion molding, resin compsn. having an MI of 1-30g/10min (190 deg.C).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resin composition for extrusion molding. More specifically, the present invention relates to a resin composition for extrusion molding that is suitably used for extrusion molding of packaging films and the like.

Currently, there is a wide variety of packaging materials used for packaging foods, medicines, miscellaneous goods, industrial supplies, etc., but most of them are low-density polyethylene made by radical polymerization,
Polyolefin resins such as polypropylene, ethylene-acetate 1'nyl copolymer, and ionically crosslinked ethylene-acrylic acid copolymer (ionomer resin) are used as the heat seal layer of the t+.

These resin layers are usually used by being laminated with a suitable base film. When producing a laminated film, adhesive lamination, coextrusion, extrusion coating, dry lamination, etc. are applied during its production.

By the way, packaging materials originally have mechanical strengths such as tensile strength, tear strength, impact strength, and heat sealing strength, as well as barrier properties such as moisture resistance and gas barrier properties, in order to protect the contents. Many functions are required, such as thermal properties such as heat resistance and cold resistance, as well as packaging machine adaptability such as heat sealability, hot tack, N property, and slip property.

In the case of a laminated film, the above-mentioned performance changes significantly depending on the selection of the profit margin, but similarly, the function of the packaging material changes significantly depending on the selection of the type of resin used for the heat-sealing layer.

For example, the following facts indicate the characteristics of packaging materials manufactured by dry laminating various polyolefin films on stretched polyamide (nylon) films. That is, when a high-pressure low-density polyethylene film is used as the heat-sealing layer, this laminated film can be heat-sealed at about 110°C or higher,
To provide a packaging material that is suitably balanced in terms of heat seal strength, burst strength, rigidity, etc. However, in automatic filling packaging, when the contents are filled immediately after being heat-sealed (1) and the weight of the contents is applied to the sealed part that has not yet been sufficiently cooled and solidified, the sealing performance is affected. Regarding tack, low-density polyethylene film is not very good.

However, when polypropylene is used for the heat-sealing layer, the heat-sealing start temperature is about 30 to 40°C higher than that of low-density polyethylene, which is disadvantageous for high-speed filling, and it also causes problems with the base material and printing ink. It has the potential to have a negative effect, such as causing heat deficiency. Furthermore, 1i? l! Although it has higher strength than low-density polyethylene in terms of durability and hot tack, it has lower impact tearing strength and is difficult to use in liquid packaging equipment (
is not necessarily appropriate.

When an ethylene-vinyl acetate copolymer is used for the heat seal layer, the heat seal turbidity 1r:J: is lower by more than 10°C, and the heat seal strength and 5P bag tear strength are also lower than when low density polyethylene is used. Although it is large, it has low rigidity and softness, and is inferior in terms of hot tack. In addition, when an ionically crosslinked ethylene-acrylic copolymer (ionomer resin) is used for the heat seal layer, low-temperature heat sealability, heat seal strength, and hot tack are improved compared to when low density polyethylene is used. In addition, although it is excellent in impact bag breakage strength, it is not as good as ethylene-vinyl acetate copolymer.

As described above, even if we compare the characteristics of various polyolefin resins that are currently generally used for the heat seal layer of laminated packaging materials, each of them has advantages and disadvantages and is not necessarily satisfactory. The present invention aims to provide a resin composition for extrusion molding that eliminates all the drawbacks of polyolefin resins used as heat-sealing layers of such packaging materials. For example, it may be extrusion coated onto a base film to form a heat seal layer thereon, or it may be extrusion molded into a single film or a composite film.

The applicant has previously proposed (a) a low-density polyethylene with a density of 0.91 to 0.94 ArA obtained by a high-pressure radical polymerization method, and (b) an ethylene-α-olefin with a density of 0.91 to 0.959 Ad. Copolymer and (c) density 085~
A resin composition for extrusion molding made by uniformly melt-mixing a low-yield and non-crystalline ethylene-α-olefin copolymer of 0.909/cr/1 (Japanese Unexamined Patent Publication No. 174,329/1982) and the above (a) component, the above (c) component and (
d) Tackifier A resin composition for extrusion molding (Japanese Unexamined Patent Publication No. 195-135-1982) prepared by uniformly melting and mixing a tackifier is proposed.

Kowara's resin composition 1 for extrusion molding fully achieves the intended purpose in terms of chair strength, but as a result of further investigation, the above (a)
), (b), (C), and (d). The material satisfies the performance required for the heat-sealing layer, and has quick extrusion processability (4), but it is particularly effective in a wide heat-sealing temperature range (11) from low to high temperatures (11). It was found to exhibit hot tack.

Therefore, the present invention relates to a resin composition suitably used for extrusion molding, etc., and this resin composition has a density of 0.91 to 0.94 l/cr obtained by (a) high-pressure radical polymerization.
l = about 10-60% by weight of low density polyethylene, (b)
Density 0.91-0.95.9. Ar11 ethylene-α
- Approximately 20 to 70% by weight of olefin (3 to 8 carbon atoms) copolymer, (C) Low crystallinity to non-crystalline ethylene-α-olefin (3 to 4 carbon atoms) with a density of 0.85 to 0.907 )
Approximately 10 to 50% by weight of the copolymer and (d) approximately 5 to 30% by weight of the tackifier are uniformly melt-mixed, and has a melt index (190°C) of 1 to 30 g/10 min. .

The low-density polyethylene used as component (a) of the resin composition according to the present invention is generally produced using oxygen, various organic peroxides, azo compounds, acetoximes, aminic acid compounds, etc. as a polymerization initiator under a reaction pressure of about i. ooo~300
It is a polyethylene with a density of 0.91 to 0.949 ArtL obtained by radical polymerization performed under high pressure of 0 atmospheres, and one of its characteristics is that intermolecular chain transfer and double bonds in the main chain are polymerized. One example is that the melt tension during melting is large due to the long chain branching that is generated when involved in the melting process.

Polyethylene obtained by polymerizing at medium to low pressures of about 1 to 100 atm C using metal oxide catalysts or 1,000 Igler catalysts does not have long chain branches, so
Its melt tension (t is very small.

1. This polymerization process
The ethylene-α-olefin copolymer copolymerized by introducing an olefin also does not have long chain branches, so its melt tension is small to 0. This melt tension affects the extrusion processability of the resin. If the stiffness is too small, the solubility and self-supporting properties of the membrane during film forming or extrusion coating will be low, resulting in film deterioration. On the other hand, if it is too large, the spread M of the molten film
There is a problem with this, and there is a relationship between this and the fact that it becomes easier to perform well during high-speed molding.

Melt index of low density polyethylene used in the present invention (C, zo ii: approximately 0.5 to 30 g/10
It's good that it's within minutes. If the melt index is lower than that, the melt viscosity is too high and it is easy to cause damage, while if the melt index is higher than 2t, the bag breakage strength and heat sealing strength will decrease and at the same time the film formation during molding will deteriorate. Stability issues arise.

The ethylene-α-olefin copolymer of component (b), ethylene and α-olefin having 3 to 8 carbon atoms, such as propylene, butene-1, pentene-1, hexene-1
It is a copolymer of 1-octene-1,3-methylbutene-1,3,3-dimethylbutene-1,4-methylpentene-1, etc., and has a density of 0.91 to 0.95 Ad. Such copolymers include various catalysts such as chromium oxide, molybdenum oxide, titanium trichloride or titanium tetrachloride-alkylaluminum, titanium compound such as titanium tetrachloride-magnesium compound such as magnesium chloride-alkylaluminum (chloride), etc. using about 1 to 1
It is manufactured by gas phase polymerization, slurry polymerization, solution polymerization, etc. under medium to low pressure. Preferably, these copolymers have an α-olefin content of about 0.2 to 8 mole percent and a melt index of about 0.5 to 30 min.

The low crystallinity to non-crystalline ethylene-α- of the component (c)
The olefin copolymer consists of ethylene and α- having 3 to 4 carbon atoms.
It is a copolymer with olefins, such as propylene, butene-1, and has a density of O,s5 to 0.90 Mffl. Such a copolymer is obtained by polymerization using a composite catalyst of a vanadium compound represented by vanadium trichloride or vanadium tetrachloride and an organoaluminum compound, and preferably contains about 5 to 30 mol% of α-olefin. They are copolymerized at a ratio of The stiff copolymer desirably has a melt index within a range of about 0.5 to 30 g/10 minutes.

By using these low crystallinity (crystallinity by volumetric method of about 35% or less) or non-crystalline ethylene-α-olefin copolymer, the softening point of the resin composition is lowered,
The low-temperature heat-sealability and heat-sealing strength are improved, and the impact resistance is also improved, so the bag-breaking strength is improved.

In addition, the tackifier used as the component (d) is an aliphatic hydrocarbon resin, an aliphatic hydrocarbon resin,
Examples include aromatic hydrocarbon resins, polyterpene resins, rosins, and styrene resins.

Examples of aliphatic hydrocarbon resins include A-butene-1, isobutylene, butadiene, and 1,3-bentadiene-1.
Examples include polymers containing 4 to C5 mono- or diolefins as main components. Examples of alicyclic hydrocarbon resins include resins obtained by cyclizing and dimerizing diene components in spent fractions 04 to 05, resins obtained by polymerizing cyclic monomers such as cyclopentadiene, and aromatic resins. Intranuclear hydrogenation of hydrocarbon resin 1. Examples include resins such as Examples of aromatic hydrocarbon resins include resins containing o9 vinyl aromatic hydrocarbons such as vinyltoluene, indene, and α-methylstyrene as a main component. Examples of polyterpene resins include α-pinene polymer, β-pinene polymer, dipentene polymer, dirupeneuf, ln/-l copolymer, and α-pinene polymer.
Examples include pinene-sepochol copolymer. Examples of rosins include rosin, polymerized rosin, hydrogenated rosin, rosin glycerin ester and its hydrogenated product or polymer, rosin pentaerythritol ester and its hydrogenated product or polymer, and the like. Further, examples of the styrene resin include polymers of styrene thread monomers, styrene-olefin copolymers, vinyltoluene-α-methylstyrene copolymers, and the like. Among various types of tackifiers, aliphatic hydrocarbon resins, alicyclic hydrocarbon resins, and styrene resins are particularly preferred due to their color tone, odor, etc.

Does the addition of these tackifiers improve hot tack of resin compositions, especially low heat sealing? 7M&(90~110℃
) is extremely effective in improving hot tack.

(a) Low density polyethylene, (b) ethylene-α-olefin (carbon number a to 8) constituting the resin composition of the present invention
copolymer, (C) low crystallinity to non-crystalline ethylene-α-
The olefin (3 to 4 carbon atoms) copolymer and (d) tackifier each contain about 10 to 60% by weight of component (a).
, component (b) is approximately 20 to 70% by weight, and component (c) is approximately 1% by weight.
0 to 50% by weight, and component (d) is 5 to 30% by weight.
It is used by mixing in the ratio of

If the mixing ratio of component (a) is less than about 10%, the melt tension of the resin composition will be low and the molten film during extrusion will become unstable, causing fluctuations in the width and thickness of the film. On the other hand, about 60%
If the amount is more, the heat sealing strength, hot tack, and bag tearing strength which are the objectives of the present invention cannot be achieved, so neither is preferable.

Regarding the mixing ratio of component (b), if it is less than about 20%, the heat seal strength, hot tack, and bag tearing strength that are the objectives of the present invention cannot be obtained, and if it is about 70% or more, The resin pressure increases, making it impossible to obtain a high discharge rate, and at the same time, the melt tension of the molten film extruded from the die is too small, making the molten film unstable, causing difficulties in continuous stable productivity. Become.

If the mixing ratio of component (C) is less than about 10%, the low-temperature heat-sealing properties and heat-sealing strength that are aimed at in the present invention will not be achieved.
On the other hand, if the amount exceeds about 50%, the pellets after kneading tend to block, and furthermore, the product after film processing or extrusion loading processing also causes blocking problems.

Furthermore, if the mixing ratio of component (d) is less than about 5%, the hot tack under the low heat-sealing temperature conditions that is the objective of the present invention cannot be obtained, while if it is about 30% or more, the The pellets tend to block, and at the same time, the products after film processing and extrusion coating also tend to block.
) The resin composition consisting of each component must also have a melt index in the range of 1 to 30 min (190°C).

If the melt index is less than 1, the resin pressure during extrusion molding of the resin composition increases, which not only causes excessive motor load but also tends to cause the molten film coming out of the goo to break. On the other hand, if it is larger than 30, not only the heat sealing strength and the bag tearing strength decrease, but also problems arise in the stability of the molten film during molding.

In this way, the above (a) and (b) of the specified mixing ratio
, (Q) and (d), and which have the specified melting properties, have excellent extrusion molding properties and, at the same time, sufficiently meet the various properties required as a heat-sealing layer. It satisfies them.

Regarding heat sealing properties, the heat sealing layer formed from this resin composition has low-temperature heat sealing properties equivalent to or higher than that of ethylene-vinyl acetate copolymer, and has heat sealing strength that is higher than that of this copolymer or ionomer resin. It outperforms this and exhibits a number of excellent properties, including hot tack over a wide heat-sealing flow rate range equivalent to that of ionomer resins, and superior bag breakage strength than polyethylene and ionomer resins. There is.

In this resin composition, K! /'i Furthermore, a slip agent, antiblocking agent, antistatic agent, etc. can be added as necessary. Slip agents that can be used include, for example, higher fatty acids having 8 to 22 carbon atoms or metal salts thereof such as aluminum salts, calcium salts, and magnesium salts, or acid amides, stearic acid esters of saturated aliphatic alcohols, ethylene bis fatty acids (carbon atoms 16 ~18) Amides and the like, 1'. Examples of the antiblocking agent include silica, charcoal, calcium chloride, and the like. Furthermore, as an antistatic agent, for example, a carbon number of 8 to 22
glycerol ester of fatty acids, nrubikun ester,
Examples include yosaccharide ester and polyethylene glycol ester.

The components (a) to (d) and components optionally added as necessary are mixed simultaneously or sequentially using an axle extruder, 24 sides! This is carried out using an extruder, Banbury mixer 1, various kneaders, etc. The mixed resin composition can be formed into a film by extrusion molding such as blown film molding or T-die casting.
Alternatively, by coextrusion molding with other suitable resins such as polyethylene, polypropylene, ethylene-acetate-1-divinyl copolymer, 7r-on crosslinked product of ethylene-acrylic acid copolymer (ionomer resin), polyamide, polyester, polystyrene, etc. , it can also be a multilayer coextruded film.

Furthermore, the single film or coextruded film formed in this way can be used as a stretched or unstretched polypropylene film or sheet, or a polyamide film or sheet).
It is also possible to make a laminated film or sheet by dry lamination, sandwich lamination, etc. with aluminum foil, cellophane, paper grid, etc., and the present invention. The layer made of the resin composition effectively acts as a heat seal layer.

The resin composition according to the present invention can be extrusion molded into a single film or various composite films or sheets as described above, but it is preferably extrusion coated onto various base materials and then heated. It is desirable to form a sealing layer. The extrusion coating is not limited to being used alone, and can also be a coextrusion coating, as in the case of forming the coextrusion film. The material to be extrusion coated includes paperboard, paper, aluminum foil, and various plastic films or sheets used in the lamination molding of the laminated film or sheet, and is applied according to a general extrusion coating method.

Various laminated films or sheets in which a layer of the resin composition of the present invention is formed by a lamination method or an extrusion coating method can be manufactured by using the resin composition of the present invention as a heat-sealing layer. , confectionery, snacks, instant ramen, furikake, dry foods such as powdered soups, meat products such as ham, sausages, and livestock meat, various foods such as aqueous foods such as konnyaku, pickles, miso, liquid soup, liquid detergents, and liquid medicines. It can also be effectively used for packaging such as products by taking advantage of its properties such as low-temperature heat-sealability, heat-seal strength, hot tack, bag tear strength, and suitability for automatic filling packaging.

Next, the present invention will be explained with reference to examples.

Example 1 Obtained by high pressure radical polymerization method, density 0.917
9/i low density polyethylene (melt index 7
g/10 min) 30 wt i%, density 0.9209/cr/l
Ethylene-4-methylpentene-1 coM combination (4i
N fi 3.0 mol%, melt index 29/i0 min) 30% by weight, density 0.88
07/crl low crystalline ethylene-butene-1 copolymer (butene-1 content i [[o mol%, melt index 4
9/i.

Stearic acid amide 10001) I)m was added as a slip agent to a mixture of 20% by weight of 20% by weight and 20% of an aliphatic hydrocarbon resin with a ring and ball softening point of 100°C, and the mixture was melt-kneaded at 140°C in a single-screw extruder. , Beret.

The melt index of this uniformly mixed resin composition was 5.4 and 710 minutes.

This resin composition pellet was melt-kneaded using an extruder with a 65-run diameter at a cylinder tip humidity of 295°C, and then extruded from a T-die to form a stretched nylon film previously prepared using an incyanate-based anchor coating agent. (thickness 15μ) to low density polyethylene (thickness 20μ)
Extrusion coating was carried out on the polyethylene surface of the extrusion coated laminated film at a processing speed of 40 m/min and a coating thickness of 40 μm. At this time, the resin temperature directly below the gooey was 285°C. The heat seal strength, hot tack and bag tear strength of the obtained three-layer laminate were measured using the methods described below, and the results are shown in Table 1 below, all of which showed good properties. value is obtained.

[Measurement method]

Heat sealing strength: heat sealing pressure 2~, heat sealing time 0.5 seconds, tensile speed 300/min, peel angle 9
Measurement under 0° condition Hot tack: A 45 g weight is separately attached to the same end of two laminate samples via a guide roll, and after the samples are heat-sealed, when the seal bar is separated, At the same time, a peeling force by a weight is applied to the seal part at an angle of 23° (this angle is set depending on the position of the guide roll on which the weight is applied), and at this time, the number of times the seal part is peeled off is measured. Bag breakage strength to be measured: Heat sealed under the conditions of pressure 2 hours, temperature 140°C, time 0.5 seconds, and the bag making size is 100 x 160.
Examples 2 to 6 in which a 200 πl of tap water was filled in a 200 μl bag and pressurized at a pressure rate of 10 μl using an automatic press. Various characteristic values were similarly measured for the three-layer laminate obtained.

As shown in Table 1 below, good results were obtained in all cases.

Comparative Example 1 In Example 1, extrusion coating of only low density polyethylene was performed. As shown in the results in Table 1 below, compared to the extrusion coating laminate of the resin composition according to the present invention, the heat seal strength W-/) is lower, the low temperature heat sealability and hot tack are inferior, and the bag breakage is lower. It also has low strength, making it unsuitable as a packaging material.

Comparative Example 2 In Example I, ethylene-4-methylpentene-1
Extrusion coating of only the copolymer was carried out, but both ends of the molten film extruded from the T-gui were not stable, making it impossible to obtain an extrusion coating film of a constant width and thickness.

Comparative Example 3 In Example 1, extrusion coaching of only the low-crystalline ethylene-butene-1 copolymer was performed, but both ends of the molten film extruded from the T-Guy were not stable and had a constant width and thickness. It was possible to obtain an extrusion coating film of 1.

Comparative Example 4 In Example 1, 70% by weight of low density polyethylene, 20% by weight of ethylene-4-methylpentene-1 copolymer, and 20% by weight of low-crystalline ethylene-butene-1 copolymer were used without using a tackifier. Extrusion coating of a resin composition containing 10% polymer was carried out.

As shown in the results in Table 1 below, it is inferior in terms of low humidity hot tack compared to the extrusion coating laminate of the resin composition according to the present invention.

Comparative Example 5 In Comparative Example 4, low density polyethylene total 60% by weight,
30% of mataethylene-4-methylpentene-1 copolymer
I changed it to heavy forging %. As shown in the results in Table 1 below, the hot tack at a low heat-sealing temperature of 100 to 120°C is inferior to the extrusion coating laminate of the resin composition according to the present invention. There is a point where he lacks teno aptitude.

Comparative Example 6 In Example 1, the total amount of low density polyethylene was 60% by weight,
30% by volume of low crystalline ethylene-butene-1 copolymer,
A resin composition containing 10% by weight of frozen aliphatic hydrocarbon resin was extrusion coated. As shown in the results of Clothing 1 described later, the hot tack is inferior to that of the extrusion coating laminate of the resin composition according to the present invention, so it lacks suitability as a packaging material.

Comparative Example 7 Using an ethylene-vinyl acetate copolymer (EjvA; vinyl acetate content 6% by weight, melt index 7, 710 minutes), extrusion coating was performed in the same manner as in Example 1 (however, the cylinder tip temperature was 245 ° C. ). As shown in the results in Table 1 below, compared to the extrusion coated laminate of the resin composition according to the present invention, it can be said that the low-temperature sealing property and static pressure bag breaking strength are the same, but the hot tack is inferior. Therefore, it lacks suitability as a packaging material.

Below is a blank space Example 7 In Example 1, low density polyethylene has a density of 0.
9169ArA, a total of 35% by weight of melt index 23/10 minutes, 30% by weight of ethylene-4-methylpentene-1 copolymer, low crystallinity ethylene-butene-
1 copolymer and 20% by weight of an aliphatic hydrocarbon resin having a ring and ball softening point of 100°C, and oleic acid amide 1.0 (10ppm%) as a slip agent.
2000 ppm silica as antiblocking agent
was further added, mixed well, and melt-kneaded at 140° C. using a single-screw extruder to form pellets. The melt index of this resin composition was 4/710 minutes.

Extrusion coating using this resin composition was carried out in the same manner as in Example 1, except that the coating thickness was 20μ, and the heat seal strength and hot tack of the resulting three-layer laminate were measured. are shown in Table 2 below. From this result, it is judged that this resin composition has sufficiently satisfactory performance as a heat seal layer resin for packaging materials.

Table 2 Heat seal γ crystallinity (°C) Heat seal strength 9.
45+-4) Enjo ≧ Rogen; Ku90
110 la 91
00 2010 16110
2705 18120 3570
14130 4200 16
140 4705 22150
4675 32160 4555
32 Example 8 Coextrusion coating was carried out using the resin composition pellet used in Example 7. That is, this resin composition was kneaded using an extruder with a diameter of 651 fun at a cylinder tip temperature of 295°C, and at a resin temperature of 290°C, it was kneaded into one side of an in-die adhesive type two-layer coextrusion T-die. It was sent to the manifold. On the other hand, using a low-density polyethylene layer with a density of 0.9179/rA and a melt index of 79/10 minutes, using another extruder with a cage diameter of 65, kneading was carried out at a cylinder tip humidity of 320°C, and a resin temperature of 320°C. In this state, it was fed into the other manifold of the coextrusion T-die.

Humidity was applied to 300℃ for 17 minutes in a co-extrusion T-die.
The two resin streams are combined and laminated (7): After that, the low density polyethylene is extruded from the die exit so that it is in contact with the sample, and a stretched nylon film base (thick Coextrusion coating was carried out at a processing speed of 807 yen (7,000 yen) with a composition ratio of the low density polyethylene layer of 20 μm and the resin composition layer of 2Q It.

The heat seal strength and hot tack of the resulting three-layer laminate were measured. As shown in the results of Table 3 below,
Good characteristic values were obtained for Izuku.

Table 3

Claims (1)

[Claims] 1. (a) about 10-60% by weight of low-density polyethylene with a density of 0.91-0.9497 crl obtained by high-pressure radical polymerization method, (b) with a density of 0.91-0.95 crl. Approximately 20 to 70% ethylene-α-olefin (carbon number 3 to 8) copolymer, (0) density 0.85 to 0.909
About 10 to 50% by weight of a low crystalline to non-crystalline ethylene-α-olefin (3 to 4 carbon atoms) copolymer of /ca and about 5 to 30% by weight of (d) a tackifier are uniformly melt-mixed. The melt index is 1 to 30 for 710 minutes (19
A resin composition for extrusion molding having a value of 0°C). 2. The resin composition for extrusion molding according to claim 1, which is used for extrusion coating molding. 3. The resin composition for extrusion molding according to claim 2, which is used for forming a heat seal layer. 4. The resin composition for extrusion molding according to claim 1, which is used for extrusion molding of films or sheets.