JPH11170411A - Closed cell sheet and resin material thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a closed cell sheet whose orientation balance of the compressive break strength and strength of closed cells is further enhanced and a resin material for realizing this physical property. SOLUTION: This resin material for the closed cell sheet contains (A) 20-50 wt.% of an ethylene-α olefin copolymer having a density of 0.86 g/cm<3> or more and at most, 0.94 g/cm<3> , a melt flow rate of 0.01-100 g/10 min., Mw/Mn of 1.5-5.0 and a composition distribution parameter of 2.0 or less, (B) 30-60 wt.% of low-density polyethylene with a density of 0.88-0.94 g/cm<3> and a melt flow rate of 0.1-50 g/10 min., and (C) 10-30 wt.% of high-density polyethylene with a density of 0.94-0.97 g/cm<3> and a melt flow rate of 0.01-50 g/10 min.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air chamber sheet used as a wrapping material for various articles, for reducing the impact on the articles, used as a heat insulating material, and a resin material thereof. .

[0002]

2. Description of the Related Art External forces applied to various articles are reduced,
Air chamber sheets are widely used as packaging materials used as heat insulating materials. In general, the air chamber sheet is formed by laminating two resin films of a flat resin film and a film on which a projection is formed as an air chamber, or an air chamber formed. Made of various types of thermoplastic resins, especially low-density polyethylene (LDPE), linear low-density polyethylene (LL)
Polyolefins such as DPE), high density polyethylene (HDPE), and mixtures thereof are known.

[0003]

In such an air chamber sheet having such an air chamber, it is particularly necessary that the air chamber has a high compressive breaking strength and a good balance of strength in the vertical and horizontal directions. Have been. However, the compressive breaking strength of the air chamber of the conventional general air chamber sheet is 200 to 300 kg /.
Not always enough. The tear strength was 80 to 100 kg / cm in the MD direction and 400 kg / c in the TD direction.
m and the strength balance in the vertical and horizontal directions was poor. The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an air chamber sheet in which the compressive breaking strength of the air chamber and the orientation balance of the strength are further enhanced, and a resin material for realizing the same.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies in accordance with the above object, and as a result, the following (A)
20 to 50% by weight of an α-olefin copolymer, (B)
Density 0.88 to 0.94 g / cm ³ , MFR 0.1 to 5
30 g / cm ³ of 30 g / cm ³ of other low-density polyethylene of 0 g / 10 min, and (C) density of 0.94 to 0.97 g / cm ³
R is 0.01 to 50 g / 10 min.
It has been found that this is solved by using a resin material having 0 to 30% by weight. (A) Ethylene / α-olefin copolymer satisfying (a) to (d) (a) Density d is 0.86 g / cm ³ or more and 0.94 g /
cm less than ³ (b) Melt flow rate (MFR) of 0.01 to 10
0 g / 10 min (c) Molecular weight distribution (Mw / Mn) is 1.5 to 5.0 (d) Composition distribution parameter Cb is 2.0 or less, provided that (A) ethylene / α-olefin copolymer and (B) ) The sum of low density polyethylene and (C) high density polyethylene is 100% by weight. Here, (A) the ethylene / α-olefin copolymer further includes the following (e)
It is desirable to satisfy the requirement of (f). (E) orthodichlorobenzene (ODC) at 25 ° C.
B) The amount X (% by weight) of the soluble component, the density d and the MFR satisfy the following relationship. (B) When d−0.008 × logMFR ≧ 0.93 X <2.0 (b) When d−0.008 × logMFR <0.93 X <9.8 × 10 ³ × (0.9300 −d + 0.008 × lo
(gMFR) ² +2.0 (f) There are a plurality of peaks in an elution temperature-elution amount curve by a continuous heating elution fractionation method (TREF).

Further, (A) an ethylene / α-olefin copolymer is prepared by reacting ethylene and carbon in the presence of a catalyst containing at least an organic cyclic compound having a conjugated double bond and a transition metal compound of Group IV of the periodic table. An ethylene / α-olefin copolymer obtained by copolymerizing α-olefins of Formulas 3 to 20 is desirable. The resin material has a density of 0.92 to 0.94 g / cm ³ and an MFR
Is preferably 0.5 to 20 g / 10 min. In the air chamber sheet of the present invention, at least the air chamber constituting layer is made of the above-described resin material.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. The resin material for an air chamber sheet of the present invention comprises (A) an ethylene / α-olefin copolymer, (B) a low-density polyethylene, and (C) a high-density polyethylene. [(A) Ethylene / α-olefin copolymer] The (A) ethylene / α-olefin copolymer of the present invention is a copolymer of ethylene and at least one selected from α-olefins having 3 to 20 carbon atoms. It is a polymer. The α-olefin having 3 to 20 carbon atoms is preferably one having 3 to 12 carbon atoms,
Specifically, propylene, 1-butene, 4-methyl-1-
Pentene, 1-hexene, 1-octene, 1-decene,
1-dodecene and the like. It is desirable that the content of these α-olefins is generally selected in a range of usually 30 mol% or less, preferably 20 mol% or less.

The (a) density d of the ethylene / α-olefin copolymer (A) of the present invention is at least 0.86 g / cm ³ and less than 0.94 g / cm ³ , preferably at least 0.88 and 0.8.
Less than 94 g / cm ³ , more preferably 0.90 to 0.93
g / cm ³ . When the density d is less than 0.86 g / cm ³ , rigidity and heat resistance are poor, and when it is 0.94 g / cm ³ or more, transparency and impact resistance are not sufficient.

The (A) ethylene / α-olefin copolymer (B) of the present invention has an MFR of 0.01 to 100 g / 10 min.
Preferably, it is in the range of 0.5 to 5 g / 10 minutes. If the MFR exceeds 100 g / 10 minutes, the mechanical strength such as impact resistance and tensile strength will decrease.

(C) The molecular weight distribution Mw / Mn can be calculated by gel permeation chromatography (GP
C), the weight average molecular weight (Mw) and the number average molecular weight (M
n) to determine the Mw / Mn ratio. Mw / Mn of the ethylene / α-olefin copolymer of the present invention is 1.
5 to 5.0, preferably 1.8 to 3.5, and more preferably 2 to 3. Mw / M
If n is less than 1.5, moldability is poor, and if it is 5.0 or more, impact resistance is poor or transparency is insufficient.

The (d) composition distribution parameter Cb of (A) the ethylene / α-olefin copolymer of the present invention is 2.0 or less, more preferably from 1.08 to 1.2, and more preferably from 1.08 to 1.2.
It is more preferably from 10 to 1.80, and from 1.12 to 1.80.
70 is more desirable. If it exceeds 2.0, transparency and impact resistance may be reduced, and heat shrinkage may be increased. If it is less than 1.08, the heat resistance tends to decrease.

In the present invention, the method of measuring the composition distribution parameter Cb of the ethylene / α-olefin copolymer is as follows. A heat stabilizer is added to the sample, and the sample is heated and dissolved at 135 ° C. in ODCB so that the sample concentration becomes 0.2% by weight. The heated solution is transferred to a column filled with diatomaceous earth (Celite 545), filled, and then filled at 25 ° C at 0.1 ° C / min.
And the sample is deposited on the celite surface. Next, a solution in which a sample is dissolved is collected at each temperature while the column temperature is raised stepwise to 120 ° C. in steps of 5 ° C. while flowing ODCB through the column at a constant flow rate.
After cooling the solution, the sample is reprecipitated with methanol, filtered and dried to obtain samples at each elution temperature. The weight fraction and the degree of branching (the number of branches per 1000 carbon atoms) of the separated sample are measured. ¹³ C-NMR for measuring the degree of branching
Ask by

For each fraction collected at 30 ° C. to 90 ° C. by such a method, the branching degree is corrected as follows. First, the degree of branching measured with respect to the elution temperature is plotted, and the correlation is approximated to a straight line by the least squares method to create a calibration curve. The correlation coefficient of this approximation is large enough. The value obtained from this calibration curve is defined as the degree of branching of each fraction. Note that, for a fraction collected at an elution temperature of 95 ° C. or higher, this correction is not performed because a linear relationship is not always established between the elution temperature and the degree of branching.

[0013] Then, the weight fraction w _i of each fraction, the amount of change in the degree of branching b _i per the elution temperature 5 ° C. (b _i
Obtaining the relative concentration c _i is divided by -b _i-1), by plotting the relative concentration against the branching degree to obtain a composition distribution curve. This composition distribution curve is divided by a certain width, and the composition distribution parameter Cb is calculated from the following equation.

(Equation 1) Here, c _j and b _j are the relative density and branching degree of the j-th section, respectively. The composition distribution parameter Cb is 1.0 when the composition of the sample is uniform, and the value increases as the composition distribution spreads.

[0014] Many methods have been proposed for describing the composition distribution of the ethylene / α-olefin copolymer. For example, in Japanese Patent Application Laid-Open No. 60-88016, numerical processing is performed on the assumption that the cumulative weight fraction has a specific distribution (log normal distribution) with respect to the number of branches of each of the separated samples obtained by solvent separation of the sample. , The ratio between the weight average branching degree (Cw) and the number average branching degree (Cn). The accuracy of this approximation calculation decreases when the number of branches and the cumulative weight fraction of the sample deviate from the lognormal distribution, and when a commercially available LLDPE is measured, the correlation coefficient R2 is considerably low, and the accuracy of the value is not sufficient. This C
The definition and measurement method of w / Cn and Cb of the present invention are different.

In the ethylene / α-olefin copolymer (A) of the present invention, the amount X (% by weight) of the soluble component of orthodichlorobenzene (ODCB) at 25 ° C., the density d and the MFR satisfy the following relationship. It is desirable. (B) When d−0.008 × logMFR ≧ 0.93 X <2.0 (b) When d−0.008 × logMFR <0.93 X <9.8 × 10 ³ × (0.9300 −d + 0.008 × lo
gMFR) ² +2.0... Relational expression 1 ODCB soluble content X at 25 ° C. is ethylene (co)
It indicates the ratio of the high branching degree component and the low molecular weight component contained in the copolymer, and is desirably small because it causes a decrease in heat resistance and stickiness on the surface of the molded article. ODC
The amount of the B-soluble component is influenced by the α-olefin content and the average molecular weight of the entire copolymer, that is, the density d and the MFR.

The relationship between the density d and the MFR is d−0.008.
When xlog MFR ≧ 0.93 is satisfied, the content is preferably less than 2% by weight, more preferably less than 1% by weight, further preferably less than 0.5% by weight. When the relationship between d and the MFR is d−0.008 × log MFR <0.93,
X <9.8 × 10 ³ × (0.9300−d + 0.008 × lo
gMFR) ² +2.0, but more preferably X <7.4 × 10 ³ × (0.9300).
−d + 0.008 × logMFR) ² +1.0, and X
<5.6 × 10 ³ × (0.9300−d + 0.008 × log
MFR) ² +0.5. The fact that the density d, the MFR and the amount of the ODCB-soluble component satisfy the above relationship indicates that the α-olefin contained in the entire copolymer is not ubiquitous.

The amount X of ODCB-soluble matter at 25 ° C. is measured by the following method. 0.5 g of the sample is added to 20 ml of ODCB and heated at 135 ° C. for 2 hours to completely dissolve the sample and then cooled to 25 ° C. After leaving this solution at 25 ° C. overnight, the filtrate is collected by filtering through a Teflon filter. The filtrate, which is a sample solution, is measured for the absorption peak intensity near the wave number of 2,925 cm ^-1 of asymmetric stretching vibration of methylene by an infrared spectrometer, and the sample concentration in the filtrate is calculated by a calibration curve created in advance. From this value, 2
Determine the ODCB solubles at 5 ° C.

(A) The ethylene / α-olefin copolymer preferably has a plurality of peaks in an elution temperature-elution amount curve obtained by (f) a continuous heating elution fractionation method (TREF). It is particularly preferable that the peak on the high temperature side exists between 85 ° C and 100 ° C. The presence of this peak increases the melting point and the crystallinity, thereby improving the heat resistance and rigidity of the molded article. 3 and 4 show examples of elution temperature-elution amount curves of the ethylene / α-olefin copolymer used in the present invention. FIG. 3 shows a case where a plurality of peaks exist as described above.
Is an ethylene / α-olefin copolymer polymerized using a so-called ordinary metallocene catalyst.

The method for measuring TREF according to the present invention is as follows. A heat stabilizer is added to the sample, and the sample is heated and dissolved at 135 ° C. in ODCB so that the sample concentration becomes 0.05% by weight. After pouring 5 ml of the heated solution into a column filled with glass beads, the solution is cooled to 25 ° C. at a cooling rate of 0.1 ° C./min, and the sample is deposited on the surface of the glass beads. Next, the column temperature is raised at a constant rate of 50 ° C./hr while flowing ODCB through the column at a constant flow rate, and samples that can be dissolved in the solution at each temperature are sequentially eluted.
At this time, as for the concentration of the sample in the solvent, the absorption of the asymmetric stretching vibration of methylene at a wave number of 2925 cm ^-1 is continuously detected by an infrared detector. From this concentration, an elution temperature-elution amount curve can be obtained. TREF analysis is a very small sample,
Since the change in the elution rate with respect to the temperature change can be continuously analyzed, relatively fine peaks that cannot be detected by the fractionation method can be detected.

The (A) ethylene / α-olefin copolymer of the present invention is not particularly limited as long as it is a polymer satisfying the conditions (a) to (d), more preferably (e) and (f). However, the preparation is carried out in the presence of a catalyst containing at least an organic cyclic compound having at least a conjugated double bond and a transition metal compound of Group IV of the periodic table.
It is desirable to copolymerize the α-olefin of the formula (1). In addition,
Details of a preferred production method will be described later.

The ethylene / α-olefin copolymer (A) has a relatively wide composition distribution despite its narrow molecular weight distribution, and has a low content of low molecular weight components and amorphous portions. In addition to improving flexibility, impact resistance, and sealing properties, it has anti-blocking properties and achieves good slip properties.

[(B) Low Density Polyethylene] The (B) low density polyethylene of the present invention has a density of 0.88 to 0.9.
4 g / cm ³ , which is a polyethylene different from (A) the ethylene / α-olefin copolymer. 0.8 density
If it is less than 8 g / cm ³ , the stiffness and heat resistance of the air chamber sheet will decrease, and if it exceeds 0.94 g / cm ³ , the transparency will decrease.

The low density polyethylene (B) has an MFR of 0.1 to 50 g / 10 min, preferably 0.5 to 20 g.
/ 10 minutes. When the MFR is less than 0.1 g / 10 minutes,
Molding processability is inferior. If it exceeds 50 g / 10 minutes, the drawdown property during molding deteriorates.

As the low-density polyethylene (B), the following low-density polyethylenes (I) and (II) are preferred. (I) The density by the high pressure radical polymerization method is 0.910 to 0.9.
935 g / cm ³ of low density polyethylene and copolymers of said ethylene with other comonomers. Examples of such a low-density polyethylene include an ethylene-vinyl acetate copolymer, ethylene and an α-β-unsaturated carboxylic acid, or a derivative thereof. (II) a copolymer of ethylene and at least one selected from α-olefins having 3 to 20 carbon atoms, wherein the copolymer has a density of 0.1;
An ethylene copolymer of 88 g / cm ³ or more and less than 0.94 g / cm ^{3 is} exemplified. Specifically, ultra low density polyethylene and linear low density polyethylene are preferably mentioned. The α-olefin having 3 to 20 carbon atoms is preferably 3 to 12 and specifically includes propylene, 1-butene, 4-methyl-1-pentene, 1-hexene, 1-octene, -Decene, 1-dodecene and the like. The content of these α-olefins is usually 30 mol% or less in total, preferably 20 mol%.
It is desirable to select within the following range.

In the (II) ethylene copolymer,
Its molecular weight distribution Mw / Mn is preferably 1.5 to 5.0, more preferably 1.6 to 4.0, and 1.8.
More preferably, it is in the range of 3.5. If Mw / Mn is less than 1.5, molding processability tends to be poor, and if it is 5.0 or more, impact resistance is poor and transparency tends to be insufficient.

Further, in the ethylene copolymer (II), the MFR and the intrinsic viscosity η (dl / g) preferably satisfy the following relationship. logη ≦ −0.205 × logMFR + 0.218 More preferably, −0.133 × logMFR + 0.067
<Logη ≦ −0.205 × logMFR + 0.218, more preferably −0.167 × logMFR + 0.133 <log
It is preferable that η ≦ −0.205 × logMFR + 0.218 is satisfied. logη is −0.205 × logMFR + 0.218
When the content is less than or equal to the above, the melt tension is increased, and especially the moldability is improved, and the effect of improving the transparency is great.

The intrinsic viscosity η is measured as follows. A heat stabilizer is added to the sample, and the sample concentration is 1 g / l in decalin.
Heat and dissolve at 135 ° C. so that Decalin to which the heat stabilizer has been added is also kept at 135 ° C. The flowing time of each of these solutions is measured using an improved Ubbelohde viscometer (maintained at 135 ° C.), for example, an automatic capillary viscosity measuring device (“ss-290s” manufactured by Shibayama Scientific Instruments). Then, the intrinsic viscosity η is measured by the following equation. η = ln (t / t ₀ ) × (1 / C) where t ₀ is the flow time of decalin (second), t is the flow time of the sample solution (second), and C is the sample concentration (sample per 100 ml of solution). (G). This (II) ethylene copolymer can particularly improve processability, rigidity, and heat resistance.

This (II) ethylene copolymer is polymerized in the presence of a catalyst containing at least a transition metal compound of Group IV of the periodic table. Preferably, the polymerization is carried out in the presence of a catalyst containing at least an organic cyclic compound having a conjugated double bond and a transition metal compound of Group IV of the periodic table.

[(C) High-density polyethylene] The (C) high-density polyethylene of the present invention has a density of 0.94 to 0.9.
97g / cm ^3, MFR is 0.01~50g / 10-minute high-of
It is produced by an ionic polymerization method at medium / low pressure. This (C) high-density polyethylene has a density of 0.9.
4 to 0.97 g / cm ³ , more preferably 0.9.
5 to 0.96 g / cm ³ . 0.94g density
/ Cm ^{3 is} less than 0.97 g /
If it exceeds cm ³ , the compatibility with (B) low-density polyethylene decreases.

The high-density polyethylene (C) has an MFR of 0.01 to 50 g / 10 min, but preferably in the range of 0.5 to 40 g / 10 min. MFR 0.01 g / 10
If it is less than 10 minutes, the extrusion amount at the time of molding is reduced and molding becomes difficult, and if it exceeds 50 g / 10 minutes, the drawdown property at the time of molding is deteriorated.

In producing the ethylene / α-olefin copolymer (A), the following components (a1) to (a)
It is desirable to use a catalyst obtained by contacting (a4) with each other. (A1): the general formula ^{_{Me 1 R 1 p R 2 q}} (OR 3) r X 1 4-pqr
A transition metal compound of Group IV of the periodic table represented by
e ¹ represents zirconium, titanium or hafnium; R ¹ and R ^{3 each} independently represent a hydrocarbon group having 1 to 24 carbon atoms; R ² represents a 2,4-pentanedionato ligand or a derivative thereof; or dibenzoylmethanato A ligand, a derivative such as a benzoylacetonate ligand, X ¹ represents a halogen atom,
p, q and r are respectively 0 ≦ p ≦ 4, 0 ≦ q ≦ 4, 0
≦ r ≦ 4, 0 ≦ p + q + r ≦ 4). (A2): a compound represented by the general formula Me ² R ⁴ m (OR ⁵ ) _n X ² _zmn (where Me ² is an element from Groups I to III of the periodic table,
R ⁴ and R ⁵ each represent a hydrocarbon group having 1 to 24 carbon atoms, X ²
Is a halogen atom or a hydrogen atom (however, when X ² is a hydrogen atom, Me ² is limited to a group III element of the periodic table)
, Z represents the number of Me ² , m and n are each 0
≦ m ≦ z, 0 ≦ n ≦ z, and an integer satisfying the range of 0 ≦ m + n ≦ z). (A3): an organic cyclic compound having a conjugated double bond. (A4): A catalyst obtained by bringing a modified organic aluminum oxy compound containing an Al-O-Al bond and / or a boron compound into contact with each other.

The general formula Me ¹ R ¹ _{p of the} catalyst component (a1)
In the formula of the transition metal compound belonging to Group IV of the periodic table represented by R ² _q (OR ³ ) _r X ¹⁴ _-pqr , Me ¹ represents zirconium, titanium, or hafnium. The type of these transition metals is not limited, and a plurality of transition metals can be used. However, it is particularly preferable that zirconium having excellent weather resistance of the copolymer is contained. R ¹ and R ³ each have 1 to 24 carbon atoms
Which preferably has 1 to 12 carbon atoms, more preferably 1 to 8 carbon atoms, and specifically includes alkyl groups such as methyl, ethyl, propyl, isopropyl, and butyl; vinyl and allyl An alkenyl group such as a group; an aryl group such as a phenyl group, a tolyl group, a xylyl group, a mesityl group, an indenyl group, and a naphthyl group; And an aralkyl group. These may have branches. R
² is a 2,4-pentanedionato ligand or a derivative thereof,
Or a derivative such as a dibenzoylmethanato ligand or a benzoylacetonato ligand. X ¹ represents a halogen atom such as fluorine, iodine, chlorine and bromine;
And r are respectively 0 ≦ p ≦ 4, 0 ≦ q ≦ 4, 0 ≦ r ≦
4, 0 ≦ p + q + r ≦ 4.

Examples of the compound represented by the general formula of the catalyst component (a1) include tetramethyl zirconium, tetraethyl zirconium, tetrabenzyl zirconium,
Tetrapropoxyzirconium, tripropoxymonochlorozirconium, dipropoxydichlorozirconium, tetrabutoxyzirconium, tryptoxymonochlorozirconium, dibutoxydichlorozirconium,
Examples thereof include tetrabutoxytitanium and tetrabutoxyhafnium, and specific examples of the 2,4-pentanedionato ligand or a derivative thereof include tetra (2,4-
(Pentanedionato) zirconium, tri (2,4-pentanedionato) chloride zirconium, di (2,4-
Pentanedionato) diethoxide zirconium, di (2,4-pentanedionato) di-n-propoxide zirconium, di (2,4-pentanedionato) di-n
-Butoxide zirconium, di (2,4-pentanedionato) dibenzyl zirconium, di (2,4-pentanedionato) dineofylzirconium, tetra (dibenzoylmethanato) zirconium, di (dibenzoylmethanato) die Zirconium toxide, zirconium di (dibenzoylmethanato) di-n-propoxide, zirconium di (benzoylacetonate), zirconium di (benzoylacetonate) di-n-propoxide zirconium, di (benzoylacetonate) ) Di-n-
Butoxide zirconium and the like, and two or more of these may be used in combination.

The general formula Me ² R ⁴ _{m of the} catalyst component (a2)
(OR ⁵ ) _n X ^{2 In the} compound represented by _zmn , Me ²
Represents an element of Groups I to III of the periodic table, such as lithium, sodium, potassium, magnesium, calcium, zinc, boron, and aluminum. R ⁴ and R ⁵ are each a hydrocarbon group having 1 to 24 carbon atoms, preferably 1 to 1 carbon atoms.
2, more preferably 1 to 8, specifically alkyl groups such as methyl group, ethyl group, propyl group, isopropyl group and butyl group; alkenyl groups such as vinyl group and allyl group; phenyl group, tolyl group, Aryl groups such as a xylyl group, a mesityl group, an indenyl group, and a naphthyl group; and aralkyl groups such as a benzyl group, a trityl group, a phenethyl group, a styryl group, a benzhydryl group, a phenylbutyl group, and a neofuyl group. These may have branches. X ² represents a halogen atom or a hydrogen atom such as fluorine, iodine, chlorine and bromine. However, when X ² is a hydrogen atom, Me ² is limited to a group III element of the periodic table exemplified by boron, aluminum and the like. Z represents the valence of Me ² , m and n are integers satisfying 0 ≦ m ≦ z and 0 ≦ n ≦ z, respectively, and 0 ≦ m + n ≦ z.

Examples of the compound represented by the general formula of the catalyst component (a2) include organic lithium compounds such as methyllithium and ethyllithium; dimethylmagnesium, diethylmagnesium, methylmagnesium chloride,
Organic magnesium compounds such as ethyl magnesium chloride; organic zinc compounds such as dimethyl zinc and diethyl zinc; organic boron compounds such as trimethyl boron and triethyl boron; trimethyl aluminum, triethyl aluminum, tripropyl aluminum, triisobutyl aluminum, trihexyl aluminum and trihexyl aluminum Decyl aluminum, diethyl aluminum chloride, ethyl aluminum dichloride, ethyl aluminum sesquichloride, diethyl aluminum ethoxide,
Derivatives such as organoaluminum compounds such as diethylaluminum hydride are exemplified.

Examples of the organic cyclic compound having a conjugated double bond of the catalyst component (a3) are as follows: 1) It has two or more, preferably two to four, more preferably two to three co-projected double bonds. A cyclic hydrocarbon compound having one or more carbocycles and a total carbon number of 4 to 24, preferably 4 to 12; 2) the cyclic hydrocarbon compound of the above 1) has 1 to 6 hydrocarbon groups ( Typically, a cyclic hydrocarbon compound partially substituted with an alkyl group or aralkyl group having 1 to 12 carbon atoms 3) 2 or more, preferably 2 to 4, more preferably 2 or more conjugated double bonds An organosilicon compound having a cyclic hydrocarbon group having 1 to 2 or more carbocycles having 3 to 3 carbon atoms and having a total carbon number of 4 to 24, preferably 4 to 12 4) the cyclic hydrocarbon group of the above 3) Hydrogen is partially from 1 to 6 hydrocarbon groups Organosilicon compounds having a substituted cyclic hydrocarbon group 5) Alkali metal salts (sodium or lithium salts) of the compounds shown in the above 1) to 4).

One of the cyclic hydrocarbon compounds suitable as the component (a3) is represented by the following chemical formula 1.

Embedded image [In the chemical formula 1, R ⁶ , R ⁷ , R ⁸ , R ⁹ , and R ^{10 each} independently represent hydrogen or a hydrocarbon group having 1 to 10 carbon atoms, and any two of the hydrocarbon groups are cyclically linked together. Hydrocarbon groups can be formed. The hydrocarbon group in Chemical Formula 1 includes an alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, a t-butyl group, a hexyl group, and an octyl group; a methoxy group, an ethoxy group, a propoxy group, and a butoxy group. An alkoxy group;
Aryl groups such as a phenyl group; aryloxy groups such as a phenoxy group; and aralkyl groups such as a benzyl group. In addition, when any two of the hydrocarbon groups of Formula 1 form a cyclic hydrocarbon group together, the skeleton thereof includes cycloheptatriene, aryl, and a condensed ring thereof. Among the cyclic hydrocarbon compounds represented by the above Chemical Formula 1, preferred are cyclopentadiene, indene, azulene, etc., and those substituted with alkyl, aryl, aralkyl, alkoxy or aryloxy having 1 to 10 carbon atoms. And the like. Chemical formula 1
Is an alkylene group (the number of carbon atoms is usually 2 to 8, preferably 2 to 3) or an alkylidene group (the number of carbon atoms is usually 2 to 8, preferably 2 to 3)
Compounds bonded (crosslinked) via 3) are also preferably used.

The organosilicon compound having a cyclic hydrocarbon group can be represented by the following general formula. Here ^{_{A L SiR 11 MX 3 4L-}} M, A represents a cyclopentadienyl group, substituted cyclopentadienyl group, indenyl group, the cyclic hydrocarbon group exemplified by substituted indenyl group, R ¹¹ is a methyl group Alkyl groups such as ethyl, propyl, isopropyl, butyl, pentyl, hexyl, and octyl groups; alkenyl groups such as vinyl and allyl groups; alkoxy groups such as methoxy, ethoxy, propoxy, and butoxy groups An aryl group such as a phenyl group, a tolyl group or a xylyl group; an aryloxy group such as a phenoxy group; preferably an 1-12 hydrocarbon residue or hydrogen, not R ¹¹ is n- only iso-, s-, t-, neo- or the like In which encompasses be a variety of structural isomers groups. X
³ represents a halogen atom of fluorine, iodine, chlorine or bromine, and L and M are in the range of 0 <L ≦ 4, 0 ≦ M ≦ 3, and preferably 1 ≦ L + M ≦ 4.

Therefore, the following compounds are included in the organic cyclic hydrocarbon compound usable as the component (a3). Cyclopentadiene, methylcyclopentadiene, ethylcyclopentadiene, t-butylcyclopentadiene, propylcyclopentadiene, isopropylcyclopentadiene, butylcyclopentadiene, isobutylcyclopentadiene, sec-butylcyclopentadiene, 1-methyl-3-ethylcyclopentadiene, 1-ethyl-3-methylcyclopentadiene, 1
-Methyl-3-propylcyclopentadiene, 1-propyl-3-methylcyclopentadiene, 2-ethyl-5
-Isopropylcyclopentadiene, 2-methyl-5
Phenylcyclopentadiene, 2-ethyl-3,5-dimethylcyclopentadiene, hexylcyclopentadiene, octylcyclopentadiene, 1,2-dimethylcyclopentadiene, 1,3-dimethylcyclopentadiene, 1,2,4-trimethylcyclopentadiene 1,2,
Substituted cyclopentadiene such as 3,4-tetramethylcyclopentadiene and pentamethylcyclopentadiene;
Indene, 2-methylindene, 4-methylindene,
Substituted indenes such as 4,7-dimethylindene, 4,5,6,7-tetrahydroindene, substituted cycloheptatrienes such as cycloheptatriene and methylcycloheptatriene, cyclooctatetraene, methylcyclooctatetraene and the like C 7 to C 24 cyclopolyene or substituted cyclopolyene such as substituted cyclooctatetraene, azulene, methylazulene, ethylazulene, fluorene, and substituted fluorene such as methylfluorene;

Dimethylsilylenebiscyclopentadiene, dimethylsilylenebisindene, dimethylsilylenebispropylcyclopentadiene, dimethylsilylenebisbutylcyclopentadiene, diphenylsilylenebiscyclopentadiene, diphenylsilylenebisindene, diphenylsilylenebispropylcyclopentadiene, diphenylsilylenebisbutyl Cyclopentadiene, monocyclopentadienylsilane, dicyclopentadienylsilane, tricyclopentadienylsilane, tetracyclopentadienylsilane, monocyclopentadienylmonomethylsilane, monocyclopentadienylmonoethylsilane, monocyclo Pentadienyldimethylsilane, monocyclopentadienyldiethylsilane, monocyclopentadienyltol Methylsilane, monocyclopentadienyltriethylsilane, monocyclopentadienyl monomethoxysilane, monocyclopentadienyl monoethoxysilane, monocyclopentadienyl monophenoxysilane, monocyclopentadienyl monomethylmonochlorosilane, monocyclopentadi Enyl monoethyl monochlorosilane, monocyclopentadienyl monomethyl dichlorosilane, monocyclopentadienyl monoethyl dichlorosilane, monocyclopentadienyl trichlorosilane, dicyclopentadienyl monomethyl silane,
Dicyclopentadienyl monoethylsilane, dicyclopentadienyldimethylsilane, dicyclopentadienyldiethylsilane, dicyclopentadienylmethylethylsilane, dicyclopentadienyldipropylsilane, dicyclopentadienylethylpropyl Silane, dicyclopentadienyldiphenylsilane, dicyclopentadienylphenylmethylsilane, dicyclopentadienylmethylchlorosilane, dicyclopentadienylethylchlorosilane, dicyclopentadienyldichlorosilane, dicyclopentadienylmonomethoxy Silane, dicyclopentadienyl monoethoxysilane, dicyclopentadienyl monomethoxy monochlorosilane, dicyclopentadienyl monoethoxy monochlorosilane, tricyclopentadienyl monomethyl Rushiran, tri cyclopentadienyl monoethyl silane, tri cyclopentadienyl monomethoxy silane, tri cyclopentadienyl mono silane, tri cyclopentadienyl monochlorosilane,
3-methylcyclopentadienylsilane, bis-3-methylcyclopentadienylsilane, 3-methylcyclopentadienylmethylsilane, 1,2-dimethylcyclopentadienylsilane, 1,3-dimethylcyclopentadienylsilane 1,1,4-trimethylcyclopentadienylsilane, 1,2,3,4-tetramethylcyclopentadienylsilane, pentamethylcyclopentadienylsilane,

Monoindenyl silane, diindenyl silane, triindenyl silane, tetraindenyl silane,
Monoindenyl monomethylsilane, monoindenyl monoethylsilane, monoindenyldimethylsilane, monoindenyldiethylsilane, monoindenyltrimethylsilane, monoindenyltriethylsilane, monoindenylmonomethoxysilane, monoindenylmonoethoxysilane , Monoindenyl monophenoxysilane, monoindenyl monomethyl monochlorosilane, monoindenyl monoethyl monochlorosilane, monoindenyl monomethyl dichlorosilane, monoindenyl monoethyl dichlorosilane, monoindenyl trichlorosilane, diindenyl monomethylsilane, Diindenylmonoethylsilane, diindenyldimethylsilane, diindenyldiethylsilane, diindenylmethylethylsilane, diindenyldipropylsilane, Indenyl ethylpropyl silane,
Diindenyldiphenylsilane, diindenylphenylmethylsilane, diindenylmethylchlorosilane, diindenylethylchlorosilane, diindenyldichlorosilane, diindenylmonomethoxysilane, diindenylmonoethoxysilane, diindenylmonomethoxy Monochlorosilane, diindenylmonoethoxymonochlorosilane, triindenylmonomethylsilane, triindenylmonoethylsilane, triindenylmonomethoxysilane, triindenylmonoethoxysilane, triindenylmonochlorosilane, 3-methylindenylsilane , Bis-3-methylindenylsilane, 3-methylindenylmethylsilane, 1,2-dimethylindenylsilane, 1,
Examples thereof include 3-dimethylindenylsilane, 1,2,4-trimethylindenylsilane, 1,2,3,4-tetramethylindenylsilane, and pentamethylindenylsilane.

Any one of the above compounds may be an alkylene group (having usually 2 to 8 carbon atoms, preferably 2 to 8 carbon atoms).
3) or an alkylidene group (the number of carbon atoms of which is usually 2 to 8,
Compounds linked via preferably 2-3) can also be used as component (a3) of the present invention, such as ethylene biscyclopentadiene, ethylene bispropylcyclopentadiene, ethylene bis Butylcyclopentadiene, isopropylidenebiscyclopentadiene, isopropylidenebisindene, isopropylidenebispropylcyclopentadiene, isopropylidenebisbutylcyclopentadiene,
Bisindenylethane, bis (4,5,6,7-tetrahydro-1-indenyl) ethane, 1,3-propanedienylbisindene, 1,3-propanedienylbis (4,5,6,7 , -Tetrahydro) indene, propylene bis (1-indene), isopropylidene (1-indenyl) cyclopentadiene, diphenylmethylene (9
-Fluorenyl) cyclopentadiene, isopropylidenecyclopentadienyl-1-fluorene and the like.

In order to produce the ethylene / α-olefin copolymer (A) of the present invention, the following (compound I) is preferably selected from the above (a3) organic cyclic compounds having a conjugated double bond. Can be. (Compound I) Compound in which any two hydrocarbons represented by Chemical Formula 1 cooperate to form a cyclic hydrocarbon group Any two hydrocarbons represented by Chemical Formula 1 cooperate to form a cyclic hydrocarbon group Wherein the cyclic hydrocarbon group is substituted with a hydrocarbon group. Among R ^{6 to} R ¹⁰ represented by Chemical Formula 1, one compound is a hydrocarbon group and the other is hydrogen.

Catalyst component (a4) A modified organoaluminum oxy compound containing an Al-O-Al bond obtained by reacting an organoaluminum compound with water is usually reacted with an alkylaluminum compound and water to form an aluminoxane. The modified organoaluminum oxy compound is obtained, and usually has 1 to 100, preferably 1 to 50 Al-O-Al bonds in the molecule. Also,
The modified organic aluminum oxy compound may be linear or cyclic.

The reaction between the organoaluminum and water is usually carried out in an inert hydrocarbon. As the inert hydrocarbon,
Aliphatic, alicyclic and aromatic hydrocarbons such as pentane, hexane, heptane, cyclohexane, benzene, toluene and xylene are preferred. The reaction ratio (water / Al molar ratio) between water and the organic aluminum: compound is usually 0.25 / 1 to 1.2.
/ 1, preferably 0.5 / 1 to 1/1.

The boron compound as the catalyst component (a4) includes, for example, triethylammonium tetra (pentafluorophenyl) borate, dimethylanilinium tetra (pentafluorophenyl) borate, butylammonium tetra (bentafluorophenyl) porate, N, N −
Dimethylanilinium tetra (pentafluorophenyl) borate, N, N-dimethylaniliniumtetra (3,5-difluorophenyl) borate and the like can be mentioned.

In the present invention, the catalyst component (a1)
The catalyst obtained by contacting (a4) with each other is converted into an inorganic carrier and / or a particulate polymer carrier (a
It can also be carried in 5) and used for the polymerization reaction. In the stage of preparing the catalyst of the present invention, the inorganic carrier of the component (a5) may be in any shape such as powder, granule, flake, foil, and fiber as long as the original shape is maintained. Although it does not matter, the maximum length of any shape is usually 5 to 200 μm, preferably 10 to 100 μm. Further, the inorganic carrier is preferably porous, and usually has a surface area of 50 to 100.
0 m ² / g, pore volume in the range of 0.05 to ³ cm ³ / g. As the inorganic carrier of the present invention, carbonaceous materials, metals,
Metal oxides, metal chlorides, metal carbonates or mixtures thereof can be used and are usually at 200-900 ° C.
And fired in air or in an inert gas such as nitrogen or argon.

Suitable metals that can be used for the inorganic carrier include iron, aluminum, nickel and the like. Examples of the metal oxide include single oxides and composite oxides of Groups I to VIII of the periodic table. Specifically, SiO ₂ , Al ₂ O ₃ , MgO, CaO, B ₂ O ₃ , Ti
O ₂ , ZrO ₂ , Fe ₂ O ₃ , SiO ₂ —Al ₂ O ₃ , Al ₂ O
_{3 -MgO, Al 2 O 3 -CaO} , Al 2 O 3 -MgO-C
_{aO, Al 2 O 3 -MgO-} SiO 2, Al 2 O 3 -Cu
_{O, Al 2 O 3 -Fe 2} O 3, Al 2 O 3 -NiO, SiO 2
—MgO and the like. Note that the above formulas expressed as oxides are not molecular formulas, but only compositions. That is, the structure and component ratio of the double oxide used in the present invention are not particularly limited. Further, the metal oxide used in the present invention may adsorb a small amount of water, or may contain a small amount of impurities.

As the metal chloride, for example, an alkali metal or alkaline earth metal chloride is preferable, and specifically, MgCl ₂ , CaCl _{2 and the} like are particularly preferable. As the metal carbonate, a carbonate of an alkali metal or an alkaline earth metal is preferable, and specific examples include magnesium carbonate, calcium carbonate, barium carbonate and the like. Examples of the carbonaceous material include carbon black and activated carbon. Although any of the above inorganic carriers can be suitably used in the present invention, use of metal oxides such as silica and alumina is particularly preferable.

On the other hand, as the particulate polymer carrier, any of a thermoplastic resin and a thermosetting resin can be used as long as they maintain a solid state without melting during the catalyst preparation and the polymerization reaction. The particle size is usually 5-2000μ
m, preferably in the range of 10 to 100 μm. The molecular weight of these polymer carriers is not particularly limited as long as the polymer can exist as a solid substance at the time of catalyst preparation and polymerization reaction.
It can be used arbitrarily from low molecular weight to ultra high molecular weight. Specifically, particulate ethylene polymer, ethylene (co) polymer, propylene polymer or copolymer,
Various polyolefins represented by poly 1-butene (preferably having 2 to 12 carbon atoms), polyesters, polyamides, poly (vinyl chloride), poly (meth) acrylate, polystyrene, polynorbornene, various natural polymers, and the like. Mixtures and the like can be mentioned.

The above-mentioned inorganic carrier and / or particulate polymer carrier can be used as they are, but preferably these carriers are used as a pretreatment by using an organic aluminum compound or a modified organic aluminum oxy compound containing an Al—O—Al bond. Can be used as the component (a5) after the contact treatment.

The method for producing the ethylene / α-olefin copolymer (A) of the present invention is produced by a gas phase method, a slurry method, a solution method or the like, and is not particularly limited by a one-stage polymerization method or a multi-stage polymerization method. However, it is desirable to manufacture by a gas phase method from the viewpoint of balance between physical properties and economy.

In the resin material for an air chamber sheet of the present invention, (A) an ethylene / α-olefin copolymer and (B)
Assuming that the total of low-density polyethylene and (C) high-density polyethylene is 100% by weight, the mixing ratio of (A) ethylene copolymer is preferably 20 to 50% by weight, and 30 to 50% by weight.
More preferably, it is 40% by weight. If it is less than 20% by weight, the strength of the air chamber sheet is insufficient, and if it is more than 50% by weight, the drawdown property at the time of molding deteriorates. (B)
The mixing ratio of the low-density polyethylene is preferably 30 to 60% by weight, and more preferably 20 to 40% by weight. If it is less than 30% by weight, neck-in during molding becomes large, and if it is more than 60% by weight, heat resistance is reduced.
The compounding ratio of (C) high-density polyethylene is 10 to
It may be 30% by weight, with about 20% being most preferred. If it is less than 10% by weight, the stiffness of the air chamber sheet is insufficient, and if it is more than 30% by weight, the compatibility with (B) the low density polyethylene is insufficient.

The resin material of the present invention having at least the components (A) to (C) has a density of 0.92 to 0.95.
Desirably, it is 0.94 g / cm ³ . 0.925-
0.930 g / cm ³ is more preferable. 0.92g
If it is less than / cm ³ , the heat resistance of the air chamber sheet tends to decrease, and if it is more than 0.94 g / cm ³ , the transparency may decrease. Also, the MFR is 0.
It is preferably 5 to 20 g / 10 min, and 1 to 10 g /
10 minutes is more preferable. If the amount is less than 0.5 g / 10 minutes, the resin discharge amount during molding tends to be insufficient, and if the amount is more than 20 g / 10 minutes, the drawdown property may be deteriorated.

Further, EVA is added to the resin composition of the present invention.
It is desirable to further include an ethylene-based polymer obtained by a high-pressure radical polymerization method. By including an ethylene polymer by a high-pressure radical polymerization method, processability can be further improved. The content of the ethylene polymer by the high-pressure radical polymerization method is (A) to (C).
When the total amount of the components is 100 parts by weight, the amount is preferably 30 parts by weight or less, and more preferably 10 to 20 parts by weight.

The composition of the present invention may contain, if necessary, an antioxidant, a nucleating agent, a lubricant, an antistatic agent, a pigment, an antifogging agent as long as the properties of the present invention are not substantially impaired. Known additives such as an ultraviolet absorber, a flame retardant, and a dispersant can be added. Further, it can be used by blending with other thermoplastic resins, for example, polyolefins such as high-density polyethylene, low-density polyethylene, linear low-density polyethylene, and polypropylene, as long as the characteristics of the invention are not essentially impaired.

When the resin composition of the present invention is obtained by mixing, each polymer is mixed by various known methods, for example, a Henschel mixer, a V blender, a ribbon blender, a tumbler mixer, etc. After melt-kneading with an extruder, a twin-screw extruder, a kneader, a Banbury mixer or the like, a method of granulating or pulverizing may be employed.

The shape and the like of the air chamber sheet of the present invention are not limited, and are, for example, as shown in FIG. The air chamber sheet 10 is a circular bag-shaped protrusion, and air chambers 16, 16,.
Are formed on the surface. The shape of the air chamber is
In addition to the columnar shape, a polygonal prism such as a triangular prism or a quadrangular prism, a cone, a polygonal pyramid such as a triangular pyramid or a quadrangular pyramid, a truncated cone, a truncated polygonal pyramid, or a combination thereof may be used. Usually, the height of the air chamber is 1
２０20 mm, bottom area 1１〜15 cm ² , spacing between air chambers 0.5０100 mm. As shown in FIG. 2, the air chamber sheet 10 is formed by laminating a flat base film 12 and an embossed film 14 on which a plurality of protrusions are formed, and the manufacturing method is not particularly limited. Instead, it can be manufactured by a conventionally known method. For example, Japanese Patent Publication No. 37-13772, Japanese Patent Publication No. 38-33
No. 0, JP-A-9-123320, and the like can be applied.

As described above, the air chamber sheet is composed of a laminated film of two or three or more layers. However, each film may be composed of the same material or a combination of different materials. Good, but in that case it is necessary to use a combination that increases the laminate strength. In the air chamber sheet of the present invention, any of the resin layers or all of the resin layers are made of the above-described resin material. When the resin material of the present invention is used for a part of layers, an air chamber constituting layer in which a projection is formed by embossing or the like to substantially form an air chamber, that is,
In the air chamber sheet 10 shown in FIG. 2, the embossed film 14 is made of the above resin material. Usually, the thickness of each film is 10 to 100 μm, more preferably 20 to 50 μm.

In the case of the air chamber sheet manufactured using the resin material having at least the components (A) to (C) of the present invention, the compressive breaking strength of the air chamber is improved, and the air chamber sheet has a strength of 4%.
A strength of 00 to 500 kg / piece can be exhibited.
Further, regarding the tear strength, 200 to 300 in the MD direction.
kg / cm, 250-350 kg / cm in the TD direction, exhibiting high strength in good balance.

[0061]

Next, the present invention will be described in more detail by way of examples, which should not be construed as limiting the invention thereto.

[(A) Preparation of ethylene / α-olefin copolymer] [Preparation of solid catalyst] Under nitrogen, 60 ml of purified toluene was added to a catalyst preparation device equipped with an electromagnetic induction stirrer, and then tetrapropoxyzirconium (Zr (OPr)) ₄₎ was added to 1.3g and indene 1.9 g, triethylaluminum while maintaining the system at 0 ℃ was added dropwise 3.0 g. After completion of the dropwise addition, the reaction system was kept at 80 ° C. and stirred for 8 hours. Next, a toluene solution of methylaluminoxane (Al
280 ml (concentration: 4.5 wt%) was added, and the mixture was stirred at room temperature for 1 hour. This is designated as solution A. Next, in a catalyst preparation device equipped with an electromagnetic induction stirrer under nitrogen, silica (Fuji Devison's “Grade #”) calcined in advance at 400 ° C. for 5 hours.
952 "and a surface area of 300 m ² / g), 100 g of the solution A was added, and the mixture was stirred at room temperature for 1 hour. Then, the solvent was removed by nitrogen blowing to obtain a solid catalyst powder having good fluidity. This is designated as catalyst B.

Using a continuous fluidized bed gas phase polymerization apparatus, ethylene and 1-butene were copolymerized at a polymerization temperature of 70 ° C. and a total pressure of 20 kgf / cm ² G. The polymerization was carried out by continuously supplying the catalyst B, and the polymerization was carried out while continuously supplying each gas in order to keep the gas composition in the system constant. Linear low-density polyethylene (ethylene copolymer) (LLDP) using the single-site polymerization catalyst obtained above
Table 1 shows the physical properties of E1). For comparison, the physical properties of a linear low-density polyethylene (LLDPE2) prepared using a conventional Ziegler catalyst are also shown.

[0064]

[Table 1]

Examples 1 to 3 The above-prepared linear low-density polyethylene (LLDPE1) and low-density polyethylene (LDPE, density: 0.924 g / cm ³ , MFR: 3)
g / 10 minutes) and high density polyethylene (HDPE, density:
(0.96 g / cm ³ , MFR: 5 g / 10 min) in a mixing ratio shown in Table 2 to prepare a resin material. An air chamber sheet was manufactured using each obtained resin material. For production, a single extruder was used to extrude a molten thin film made of the above resin material from a double-head die, and these were introduced between an embossing roll and a pressure roll provided opposite to each other. The emboss roll has a large number of concave portions formed on the roll surface, and each concave portion is connected to a vacuum pump. Of the two films introduced between the embossing roll and the pressure roll, the film located on the embossing roll side is attracted to the recesses when it comes into contact with the embossing rolls, and a number of projections are formed. To the film on the pressure roll side so that air is sandwiched between them, and then
Cooled with a cooling roll, bottom area 0.8 cm ² , height 10
An air chamber sheet having a two-layer configuration in which a plurality of cylindrical air chambers having a thickness of 2 mm was formed was manufactured. About the obtained air chamber sheet, the compressive breaking strength of the air chamber (kg / piece) and the tear strength (kg / cm)
Was measured.

Comparative Example In the above example, the LLDP
LLD with conventional Ziegler catalyst instead of E1
A resin material was prepared in the same manner except that PE2 was used, and an air chamber sheet was manufactured. A test was performed in the same manner as described above.

Various test methods are shown below. Density: Based on JIS K6760. Melt flow rate (MFR): based on JIS K6760. Air chamber compression breaking strength: The top surface of the air chamber was compressed from directly above (compression speed: 5 mm / min), and the strength when the air chamber was broken was measured. Tear strength: JIS K712 in MD and TD directions
The average tear load was determined at a crosshead speed of 200 mm / min according to the 8 A method.

[0068]

[Table 2]

As is evident from Table 2, the air chamber sheet of this example has a high air chamber compression breaking strength and an excellent balance of orientation in tear strength.

[0070]

According to the air chamber sheet of the present invention, the compressive breaking strength of the air chamber is high and the orientation balance of the strength is excellent.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an air chamber sheet.

FIG. 2 is a perspective view in which a part of the air chamber sheet is peeled off.

FIG. 3 is a graph showing an example of a TREF curve of (A) an ethylene / α-olefin copolymer.

FIG. 4 is a graph showing an example of a TREF curve of the ethylene / α-olefin copolymer (A) using an ordinary metallocene catalyst. 10 air chamber sheet 12 base film 14 embossed film 16 air chamber

Claims (5)

[Claims] 1. The following (A) 20 to 50% by weight of an ethylene / α-olefin copolymer and (B) a density of 0.88 to
0.94 g / cm ³ , 30 to 60% by weight of another low density polyethylene having an MFR of 0.1 to 50 g / 10 min, (C) a density of 0.94 to 0.97 g / cm ³ and an MFR of 0 .01-5
0 to 10% by weight of high-density polyethylene of 0 g / 10 minutes, and the total of (A) the ethylene / α-olefin copolymer, (B) low-density polyethylene and (C) high-density polyethylene is 100% by weight. % Resin material for air chamber sheets. (A) Ethylene / α-olefin copolymer satisfying (a) to (d) (a) Density d: 0.86 g / cm ³ or more, 0.94 g / c
less than m ³ (b) Melt flow rate (MFR): 0.01 to 10
0 g / 10 min (c) Molecular weight distribution (Mw / Mn): 1.5 to 5.0 (d) Composition distribution parameter Cb: 2.0 or less 2. The resin material for an air chamber sheet according to claim 1, wherein the ethylene / α-olefin copolymer (A) further satisfies the following requirements (e) and (f). (E) orthodichlorobenzene (ODC) at 25 ° C.
B) The amount X (% by weight) of the soluble component, the density d and the MFR satisfy the following relationship. (B) When d−0.008 × logMFR ≧ 0.93 X <2.0 (b) When d−0.008 × logMFR <0.93 X <9.8 × 10 ³ × (0.9300 −d + 0.008 × lo
(gMFR) ² +2.0 (f) There are a plurality of peaks in an elution temperature-elution amount curve by a continuous heating elution fractionation method (TREF). 3. The method according to claim 1, wherein the ethylene / α-olefin copolymer (A) is mixed with ethylene in the presence of a catalyst containing at least an organic cyclic compound having a conjugated double bond and a transition metal compound of Group IV of the periodic table. The resin material for an air chamber sheet according to claim 1 or 2, wherein the resin material is an ethylene / α-olefin copolymer obtained by copolymerizing an α-olefin having 3 to 20 carbon atoms. 4. The resin material has a density of 0.92 to 0.9.
4g / cm ^3, MFR is air chambers resin material sheet according to claim 1, characterized in that a 0.5 to 20 g / 10 min. 5. An air chamber sheet having a plurality of air chambers, wherein at least an air chamber constituting layer is made of the resin material for an air chamber sheet according to any one of claims 1 to 4. Room sheet.