JP2001213990A - Polyolefin based resin foamed sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide polyolefin based resin foamed sheets having excellent various properties such as moldability and surface performance which are used in building components such as wall covering materials, surface materials of bulletin boards and the like. SOLUTION: The polyolefin based resin foamed sheet comprises (1) 100-70 pts.wt. copolymer of ethylene with a 3-12C α-olefin which has specific property values and has been obtained by polymerization using a metallocene catalyst, (2) 0-30 pts.wt. olefin based elastomer, (3) 0.5-50 pts.wt., based on 100 pts.wt. sum of the ethylene/α-olefin copolymer and the olefin based elastomer, cork powder having an average particle diameter of 200-3,000 μm, and (4) 0.50-10 pts.wt., based on 100 pts.wt. sum of the ethylene/α-olefin copolymer and the olefin based elastomer, blowing agent, and have an expansion ratio of 1.1-10 times and, grains having a groove depth of 50-4,000 μm and a groove pitch of 50-4,000 μm which are formed on at least one side of the sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foamed sheet made of polyolefin resin containing cork powder, which is suitable as an interior material of a building or a billboard surface material, a laminate using the foamed sheet, and a billboard surface material. Things.

[0002]

2. Description of the Related Art Conventionally, the interior material of a building and the surface material of a bulletin board for posting a bulletin board have excellent surface performance such as a pin hole that is not conspicuous when a pin is pierced, and are also flame retardant and durable. In addition, foamed sheets made of vinyl chloride resin are widely used because of their excellent properties and low cost. However, when a vinyl chloride resin foam sheet is incinerated after use, it is necessary to take measures such as using an acid-resistant incinerator, and it takes time and effort to separate and treat the sheet. There was a problem. Further, there is a problem that the plasticizer contained in the sheet blows out and easily contaminates the surface of the sheet and other articles in contact with the sheet. Also, Japanese Patent Application Laid-Open No. 10-2592
No. 56 discloses a sheet made of a polyolefin resin having specific physical properties and cork powder, but this sheet has excellent properties such as moldability and strength, but when used as a bulletin board surface material or the like. Had a problem in that pinhole marks were conspicuous.

[0003]

SUMMARY OF THE INVENTION The present invention provides a foamed sheet made of a polyolefin resin containing cork powder, which is excellent in surface performance such as inconspicuousness after pin holes, tensile physical properties, and design properties.

[0004]

The gist of the present invention is to provide (1)
(A) a copolymer of ethylene and an α-olefin having 3 to 12 carbon atoms, obtained by polymerization using a metallocene catalyst, and (b) a density of 0.86 to 0.92 g / cm ^Three
, (C) the melt flow rate is 0.5 to 40 g / 10
(D) 100 to 70 parts by weight of an ethylene-α-olefin copolymer having a ratio (Mw / Mn) of 1.5 to 5 between the weight average molecular weight (Mw) and the number average molecular weight (Mn),
(2) 0 to 30 parts by weight of an olefin elastomer,
(3) Cork powder having an average particle diameter of 200 to 3000 µm per 100 parts by weight of the total amount of the ethylene-α-olefin copolymer and the olefin-based elastomer is 0.5 to 50.
(4) a polyolefin resin sheet containing 0.5 to 10 parts by weight of a blowing agent per 100 parts by weight of the total amount of the ethylene-α-olefin copolymer and the olefinic elastomer, Is 1.1 to 10
And at least one surface of the sheet has a groove depth of 50 to 4000 μm and a groove pitch of 50 to 4000 μm.
The foamed sheet made of a polyolefin resin, characterized in that the grain is formed, and the foamed sheet made of the polyolefin resin, wherein the olefin elastomer is an ethylene-propylene elastomer, and the foamed sheet made of the polyolefin resin Has a basis weight of 10 to 200
g / m ² of a fibrous layer, and a bulletin board surface material composed of the laminate.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
In the present invention, a specific ethylene-α-olefin copolymer obtained by polymerization using a metallocene catalyst is used. As the α-olefin to be copolymerized with ethylene, one having 3 to 12 carbon atoms is used. Such materials include, for example, propylene, 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 4-
Examples thereof include methyl-1-pentene and 1-decene, and one or a mixture of two or more thereof is used. The mixing ratio of α-olefin to ethylene is preferably 5 to 40% by weight. In the present invention, among the ethylene-α-olefin copolymers, the density is 0.86 to
At 0.92g / cm ^3, a melt flow rate of 0.5 to 40
g / 10 minutes, more preferably 0.8 to 30 g / 10 minutes,
And gel permeation chromatography (GP
C) the ratio (Mw / Mn) between the weight average molecular weight (Mw) and the number average molecular weight (Mn), determined from 1.5 to 5,
Preferably, an ethylene-α-olefin copolymer having 2 to 4 is used.

A metallocene catalyst (also referred to as a single-site catalyst or a Kaminski catalyst) is disclosed in Japanese Patent Application Laid-Open No. Hei 3-16308.
8, JP-A-7-118431, JP-A-7-118431
A catalyst comprising a metallocene-based transition metal complex and an organoaluminum compound as disclosed in, for example, JP-A-148895, and may be used while being supported by an inorganic substance. Examples of the metallocene-based transition metal complex include, for example, a transition metal (titanium, zirconium, hafnium) selected from group ≡B, a cyclopentadienyl group, a substituted cyclopentadienyl group, a dicyclopentadienyl group, a substituted dicyclopentadiene group. An enyl group, an indenyl group, a substituted indenyl group, a tetrahydroindenyl group, a substituted tetrahydroindenyl group, a fluorenyl group or a substituted fluorenyl group is coordinated as one or two ligands, or two of these Covalently crosslinked groups are coordinated, and also have a ligand such as a hydrogen atom, oxygen atom, halogen atom, alkyl group, alkoxy group, aryl group, acetylacetonate group, etc. .

Further, as the organic aluminum compound,
Alkyl aluminum and chain or cyclic aluminoxane are mentioned, as alkyl aluminum, triethyl aluminum, triisobutyl aluminum, dimethyl aluminum chloride, diethyl aluminum chloride, methyl aluminum dichloride, ethyl aluminum dichloride, dimethyl aluminum fluoride, diisobutyl aluminum hydride, Examples thereof include diethylaluminum hydride and ethylaluminum sesquichloride.The chain or cyclic aluminoxane can be produced by bringing the above-mentioned alkylaluminum into contact with water. Water, or water of crystallization of complex salt or water adsorbed by organic or inorganic compounds It can be obtained by reacting aluminum. Examples of the carrier for supporting the metallocene catalyst include silica gel, zeolite, and diatomaceous earth. The ethylene-α-olefin copolymer obtained by polymerization using a metallocene catalyst (hereinafter referred to as “metallocene-based ethylene-α-olefin copolymer”) is obtained by using a Ziegler catalyst, a solid catalyst, or the like. Flexibility, mechanical strength, etc. are superior to those obtained by polymerization.

The foamed sheet of the present invention may further contain an olefin elastomer in addition to the metallocene ethylene-α-olefin copolymer. As the olefin-based elastomer, ethylene-propylene copolymer,
Ethylene-propylene-diene copolymer (ethylene-propylene-ethylidene norbornene, ethylene-propylene-methylene norbornene, ethylene-propylene-
Dicyclopentadiene, ethylene-propylene-1,4
Ethylene-propylene-based elastomers such as -hexadiene, ethylene-propylene-methyloctadiene, ethylene-propylene-vinylnorbornene, etc., ethylene-1-butene copolymer, and ethylene-1-butene-diene copolymer (ethylene-1 -Butene-ethylidene norbornene, ethylene-1-butene-methylenenorbornene, ethylene-1-butene-dicyclopentadiene, ethylene-1-butene-1,4-hexadiene, ethylene-1-butene-methyloctadiene, ethylene-1 -Butene-vinylnorbornene, etc.) and a copolymer of ethylene or an α-olefin having 3 to 12 carbon atoms. Among them, an ethylene-propylene elastomer is particularly preferable.

The amount of the olefin-based elastomer is in terms of weight ratio: metallocene-based ethylene-α-olefin copolymer / olefin-based elastomer = 100 to 70/0 to 3
0, preferably 85 to 75/15 to 25. By blending the olefin-based elastomer, the foaming property and tensile strength of the sheet are further improved. When the compounding ratio of the olefin-based elastomer exceeds 30/70, the sheet surface becomes uneven at the time of sheet molding, and the appearance is poor. Cork powder is 0.5 to 5 per 100 parts by weight of the total amount of the ethylene-α-olefin copolymer and the olefin-based elastomer.
0 parts by weight are blended. When the amount of the cork powder to be blended is less than 0.5 part by weight, the effect of the addition of the cork powder is small, such as inferior design of the sheet surface. On the other hand, if the amount of cork powder is 50
When the amount is more than the weight part, the surface of the sheet becomes rough, and the end of the sheet tends to be cut off, so that the productivity is deteriorated and the physical properties of the sheet tend to be reduced. A more preferable addition amount of the cork powder is 3 to 15 parts by weight. Cork powder has an average particle size of 200-3000μ
m, preferably 500 to 2000 μm.

Fine cork powder having an average particle diameter of less than 200 μm requires time and labor for pulverization, and is liable to be powdered when mixed with a resin component or the like, and may contaminate the periphery. When the average particle diameter of the cork powder exceeds 3000 μm, the sheet is broken at the time of forming the sheet, the heat generated by the frictional resistance of the cork powder increases, and the foaming and coloring accompanying the generation of gas due to the decomposition of the cork powder may occur. This makes sheet forming difficult. The average particle size of the cork powder is JIS
The integrated value of the weight of each fraction measured by the sieve is 5
It is expressed as the particle diameter at the point where it becomes 0%. Also,
The cork powder has an average particle size within the above specific range, and is 70% by weight or more, preferably 80% by weight of the whole.
It is preferable that the above-mentioned cork powder is within the above-mentioned particle size range. The moisture contained in the cork powder is not particularly problematic as long as the cork powder does not significantly absorb moisture, but, for example, when the cork powder has a water content of more than 10% by weight, foaming at the time of molding becomes intense. Problems are more likely. In such a case, for example, use after reducing the water content in advance with an oven or a hopper dryer, etc., or prior to mixing with the resin, stir while heating only the cork powder in the mixer to be used to perform the drying process. Then, a method of adding a resin may be used. The water content of the cork powder is preferably 3% by weight or less.

The cork powder used in the present invention is bark obtained from cork oak, and may be obtained by pulverizing the bark. The bark may include an inner skin and an outer skin in addition to the cork layer. Further, a cork sheet or a cork formed in a block shape may be crushed and recycled as cork particles. As the foaming agent, a pyrolytic foaming agent may be used. As the pyrolytic foaming agent,
Commonly used organic and inorganic foaming agents are exemplified. As organic blowing agents, azodicarbonamide,
Azobisformamide, azobisisobutyronitrile,
Azo compounds such as diazoaminobenzene, nitroso compounds such as N, N'-dinitrosopentamethylenetetramine, N, N'-dimethylN, N'-dinitroterephthalamide, benzenesulfonylhydrazide, P-toluenesulfonylhydrazide, P, Examples include sulfonyl hydrazide compounds such as P'-oxybisbenzenesulfonyl hydrazide. Examples of the inorganic foaming agent include sodium bicarbonate, ammonium carbonate, ammonium bicarbonate, and ammonium nitrite. The compounding amount of the foaming agent is 0.5 to 10 parts by weight per 100 parts by weight of the total amount of the ethylene-α-olefin copolymer and the olefin-based elastomer. If the amount of the foaming agent is less than 0.5 part by weight, a sufficient expansion ratio cannot be obtained, and a sufficient cushioning property of the sheet cannot be obtained. If the amount is more than 10 parts by weight, the sheet formability will decrease or the sheet will be colored.

Further, it is preferable to add a flame retardant to the foamed sheet of the present invention in order to impart flame retardancy. Examples of the flame retardant include commonly used organic and inorganic flame retardants. Examples of the organic flame retardant include polyphosphate and phosphorus ester flame retardants such as ammonium polyphosphate and the like, nitrogen-based, halogen-based, and bromine-based flame retardants. Examples include compounds, aluminum hydroxide, magnesium hydroxide, antimony trioxide, sodium antimonate, zirconium compounds, borax, zinc borate, molybdenum trioxide, and composite inorganic substances that are complexes of these compounds. Among them, non-halogen flame retardants which do not generate harmful halogen gases at the time of fire or incineration after use, particularly polyphosphate flame retardants, are preferred. The addition amount of the flame retardant is preferably 1 to 50 parts by weight per 100 parts by weight of the total amount of the ethylene-α-olefin copolymer and the olefin elastomer. If the added amount is less than 1 part by weight, sufficient flame retardancy cannot be obtained. On the other hand, if the added amount of the flame retardant is more than 50 parts by weight, moldability deteriorates and physical properties of the sheet deteriorate.

The foamed sheet of the present invention may contain other resins and inorganic fillers, a foam decomposition accelerator, a lubricant, a surfactant, an anti-adhesive agent, if necessary, in addition to the above components, as long as the object of the present invention is not impaired. , A pigment, an antibacterial agent and the like may be added. To the composition used for the foam sheet of the present invention, other additives are added as necessary, and after kneading with a Banbury mixer,
A sheet is obtained by forming the sheet into a sheet shape using a heating roll, a calender roll, or the like. Alternatively, the composition may be mixed and pelletized by using a twin-screw extruder kneader equipped with a hot-cutting device, and the sheet may be formed by an extruder equipped with a T-die. The molding temperature is preferably from 150 to 200 ° C.
The temperature is more preferably 0 to 180 ° C. The foaming of the sheet may be performed on a sheet-by-sheet basis or in a continuous manner using equipment of a heating furnace using electricity, gas or the like. Heating furnace temperature is 160-250
C is preferred. Particularly, in order to prevent coloring of cork powder due to heat, the temperature is more preferably from 160 to 210 ° C. The expansion ratio of the sheet is preferably 1.1 to 10 times, particularly preferably 2 to 5 times. When the expansion ratio is less than 1.1 times, the cushioning properties of the foamed sheet are inferior, and pin stab marks when used as a bulletin board surface material or the like tend to be noticeable, which is not preferable. On the other hand, if the expansion ratio exceeds 10 times, the mechanical strength of the foamed sheet is undesirably reduced.

By forming a crimp having a groove depth of 50 to 4000 μm and a groove pitch of 50 to 4000 μm on at least one side of the foam sheet thus obtained, the polyolefin resin foam sheet of the present invention is formed. Is obtained. By shaping the corrugated pattern on the surface of the foam sheet, the cork that is too protruding is pressed down, or the cork buried in resin etc. is emphasized, so that the design feeling of the cork can be uniformly emphasized and the foam sheet surface is sticky The effect of eliminating the feeling, reducing the gloss of the sheet, and eliminating the glare caused by the reflection of light can be obtained. The groove depth is particularly 100 to 1000 μm, and the groove pitch is 100 to 10 μm.
It is preferably 00 μm. If the depth and pitch of the groove are within this range, there is no fear that the grain will disappear even if the cork powder once pressed into the sheet at the time of grain formation comes out again on the surface, and the cork will not be removed between the grain. This is preferable because the sheet is not buried in the valleys (concave portions) to make it difficult to design the cork and the sheet is not easily cut by the notch effect. The value of the groove depth and the pitch of the grooves referred to herein is a value obtained from a portion of the sheet surface where no cork powder exists, and this value is the value of the present invention except that it does not contain cork powder. The sheet obtained by subjecting a composition having the same composition as that of the polyolefin resin foamed sheet to foam molding and crimping under the same molding conditions as the foamed sheet has the same value as the groove depth and groove pitch of the grain.

The shape of the grain may be any of satin, stripe, lattice, polka dot and the like. To apply a texture to the foam sheet, emboss processing is performed in-line using an embossing roll or the like stamped with the texture at the time of forming the foam sheet, or the foam sheet that has been cooled is heated and softened so that it can be deformed under pressure. Alternatively, the uneven pattern may be transferred off-line by pressing on the surface provided with the uneven pattern (texture). The method of embossing is not particularly limited. For example, each compounding composition between a metal roll having a fine uneven pattern on its surface and a silicon rubber roll having elasticity and good release properties is used. And a method of transferring the fine uneven pattern provided on the surface of the metal roll, which is nipped in a state where the metal roll is heated to a temperature suitable for the above, to the surface of the foamed sheet.
At this time, there is a method in which the sheet immediately after being foamed through a heating furnace at a temperature of 160 to 250 ° C. is cooled while embossing with an embossing roll having a cooling facility capable of setting the surface temperature to 0 to 20 ° C. Generally, the depth of the groove of the embossed roll is 50 to 4000 μm.
m and the pitch may be 50 to 4000 μm. The thickness (the thickness of the maximum thickness portion) of the polyolefin-based resin foam sheet of the present invention thus obtained is not particularly limited, but is preferably 0.2 to 15 mm.
If the thickness is less than 0.2 mm, the sheet is likely to break during molding, while if the thickness exceeds 15 mm, the molding speed is reduced, and the productivity of the sheet is significantly reduced,
It is not preferable because the processability during foam molding tends to deteriorate. A more preferable sheet thickness is 0.7 to 3 mm.

Further, on one side of the foam sheet formed with a grain,
The laminate of the present invention can be obtained by laminating the fibrous layers. The method of laminating the fibrous layer with the crimped foamed sheet includes a method of laminating the fibrous layer after foaming and crimping the sheet, and a method of laminating the fibrous layer after foaming the sheet and then laminating the fibrous layer. Examples include a method of shaping, a method of embossing after foaming after laminating a fibrous layer on a sheet, and the like.
Among these manufacturing methods, a method of laminating a sheet and a fibrous layer and then foaming and embossing is preferable because foaming and embossing can be performed stably. Examples of the fibrous layer include materials made of natural fibers and synthetic fibers. Examples of such materials include paper, woven fabric, and nonwoven fabric. Of these, paper made of natural fibers is preferable. Examples of the type of paper include high quality paper for printing, medium quality paper, kraft paper, glassine paper, paperboard, Japanese paper, flame retardant paper, and noncombustible paper. The basis weight of the fibrous layer is preferably from 10 to ²⁰⁰ g / m ² . When the grammage is less than 10 g / m ² , wrinkles are likely to occur during lamination, and when the grammage exceeds 200 g / m ² , the laminate becomes rigid when formed into a laminate, causing problems in workability or increasing costs. This is not preferred. More preferred basis weight is 5
0 to 150 g / m ² .

In the laminate of the present invention, an adhesive layer may be further formed between the sheet or the foamed sheet and the fibrous layer in order to improve the adhesion between the sheet or the foamed sheet and the fibrous layer. . The adhesive layer is preferably made of a synthetic resin. Examples of the synthetic resin include a polyurethane resin and a polyolefin resin, and a polyolefin resin is particularly preferable. Among them, a polyethylene resin is more preferable. The laminate thus obtained can be used as it is as a bulletin board surface material or interior material for buildings. Alternatively, a bulletin board having a frame material attached thereto may be attached to a wood-based material such as an insulation board or a plywood with an adhesive, cut into an appropriate size, and attached.

[0018]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following examples. <Physical Properties of Polyolefin Resin> (1) Density: Measured by a density gradient tube method using a methanol / benzyl alcohol mixture according to ASTM D1505. (2) Melt flow rate (MFR): ASTM D12
38. (3) Mw / Mn: Mw and Mn were measured from a calibration curve (using standard polystyrene) using gel permeation chromatography (GPC) using trichlorobenzene as a solvent, and calculated from the measured values.

<Evaluation of Sheet and Laminate> (1) Formability: When a sheet was prepared by a molding machine, ease of molding was evaluated. The evaluation criteria are as follows.・ ・ ・: Sheets could be created and wound without any problems. Δ: A sheet could be prepared, but the appearance was inferior. X: The sheet could not be formed. (2) Expansion ratio: Determined by dividing the density of the sheet before foaming by the density after foaming. (3) Physical properties of laminate: Tensile rupture strength and tensile elongation at break of the laminate were measured according to JIS K7127. (4) Laminate surface pin piercing property: A plywood having a thickness of 5 mm was used as a base material, and the laminate was fixed to the plywood. This was repeated twice and the occurrence of pin marks was visually evaluated. The evaluation criteria are as follows.・ ・ ・: The resistance of pin sticking is small. Marks of pin holes are not so noticeable. Δ: There is a slight resistance to pin sticking. Pin holes are slightly noticeable. ×: High resistance to pin stab. Pin hole marks are very noticeable.

(5) Cork design on the surface of the laminate: The appearance and design of cork on the foam sheet side surface of the laminate were visually evaluated. The evaluation criteria are as follows.・ ・ ・: Uniform cork appearance and excellent design. Δ: Cork appearance is not very uniform and lacks design. ×: Poor in design, such as cork protruding remarkably or hidden. (6) Sticky feeling on the surface of the laminate: Evaluated by the tactile sensation when the foamed sheet side surface of the laminate was touched with fingers. The evaluation criteria are as follows. ○ ・ ・ ・ Smooth and smooth. △: A little sticky feeling. X: Strong stickiness.

(7) Workability of laminate: Using a construction adhesive (JIS A 6922) specified by the Wall Covering Materials Association,
Adhesive compounding and bonding were performed according to the standard walling standard construction method of the association, and laminates were constructed to evaluate workability. In addition, the base substrate was a plywood wall surface having a thickness of 10 mm, and a test was performed in which the laminate was constructed on the same vertical wall surface as in practical use. At this time, the influence on the workability due to the curl of the laminate and the like, and the state of adhesion to the wall surface after the adhesion work were visually evaluated. The evaluation criteria are as follows.・ ・ ・: Can be attached without any problem in construction. The adhesive strength after construction is also sufficient. Δ: After the application, the laminate was slightly lifted. Adhesive strength after construction is somewhat insufficient. X: peeled off without being fixed by the adhesive. Almost no adhesive strength.

Example 1 Metallocene ethylene-α-
Olefin copolymer (Dupont Dow Elastomer Co., Ltd.)
80 parts by weight of EG8100 manufactured by Nippon Synthetic Rubber Co., Ltd.
P) Cork powder, a flame retardant, and a foaming agent are added to 20 parts by weight in the composition ratio shown in Table 1, and the temperature is 160 ° C. and the rotor speed is 50 rpm by an internal mixer (MS-3600 manufactured by Minami-Senju Seisakusho Co., Ltd.). After kneading under the conditions of a kneading time of 7 minutes, the mixture was heated at a temperature of 1 with a heating roll (produced by Ishikawajima-Harima Heavy Industries, Ltd.).
At a temperature of 60 ° C., a sheet having a thickness of 0.4 mm was prepared.
Separately, on one side of noncombustible paper having a basis weight of 140 g / m ² ,
The above sheet was laminated with a laminator having a surface temperature of 170 ° C. using a low-density polyethylene resin film of μm as an adhesive layer. Next, the laminate was heated and foamed in a heating furnace at a temperature of 210 ° C. for 2 minutes, and then subjected to embossing roll temperature of 10 ° C. using a water-cooled embossing roll having a groove depth of 250 μm and a pitch of 250 μm. Striped grain was formed on the surface of the laminate on the foam sheet side. The shape of the grain of the obtained grain-formed laminate is as shown in Table 1.
In addition, the thickness of the sheet after foaming was shown by the value of the maximum thickness part of the sheet. The grained laminate was evaluated for physical properties, surface performance, workability, and the like. The results are summarized in Table 2.

<Example 2> A laminate was prepared in the same manner as in Example 1 except that the composition of the sheet was as shown in Table 1, and further, heat foaming and embossing were performed in the same manner as in Example 1. , And the obtained crimped laminate was evaluated in the same manner as in Example 1. The results are summarized in Table 2. <Embodiment 3> Depressed groove depth 1500 μm, groove pitch 15
Using a water-cooled embossing roll of 00 μm, on the foam sheet side surface of the laminate under the condition of an embossing roll temperature of 10 ° C.,
A crimped laminated body was obtained in the same manner as in Example 1 except that a stripe-shaped grain was formed. The thickness of the sheet before foaming was 0.8 mm. The shape of the grain of the obtained grain-formed laminate is as shown in Table 1. The obtained embossed laminate was evaluated in the same manner as in Example 1. The results are summarized in Table 2.

<Comparative Example 1> A crimped laminate was prepared and evaluated in the same manner as in Example 1 except that the polyolefin resin shown in Table 1 was used. The results are summarized in Table 2. <Comparative Example 2> A laminate was prepared and evaluated in the same manner as in Example 1 except that embossing was not performed. Table-Results
2 collectively.

[0025]

[Table 1]

* EG8100: metallocene ethylene-
α-olefin copolymer density: 0.87 g / cm ³ , MFR: 1.0 g / 10 min, Mw / Mn: 2.0,
α-olefin; octene-1 EP57P: ethylene-propylene elastomer LF625F: low density polyethylene AP422: ammonium polyphosphate AC # 3: azodicarbonamide

[0027]

[Table 2]

[0028]

The foamed sheet made of a polyolefin resin of the present invention has excellent surface properties such as no pin holes when the pin is pierced, and also has excellent properties such as tensile physical properties and design properties. It is suitably used for interior materials of materials, bulletin boards, and the like.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C08L 97/02 C08L 97/02 F-term (Reference) 4F074 AA02 AA17 AA25 AB01 AB05 AE01 AE07 AG01 BA02 BA04 BA05 BA12 BA13 BA14 BA16 BA17 BA18 BA19 BB23 CC04Y CC08Z CC10Z CE02 CE44 CE98 DA02 DA50 DA54 4F100 AK06 AK62A AK64A AL09A BA02 CA01 DB14 DB14A DE01A DG06B DJ01A EH23 EH232 EJ02 EJ022 EJ39 EJ39 EB02A01 002 GF00

Claims (4)

[Claims] (1) ethylene (a) obtained by polymerization using a metallocene catalyst and α-α having 3 to 12 carbon atoms
A copolymer with an olefin, wherein (b) the density is 0.8
6 to 0.92 g / cm ³ , (c) melt flow rate is 0.5 to 40 g / 10 min, and (d) ratio (Mw / Mn) between weight average molecular weight (Mw) and number average molecular weight (Mn).
Is from 1.5 to 5, 100 to 70 parts by weight of an ethylene-α-olefin copolymer, (2) 0 to 30 parts by weight of an olefin-based elastomer, and (3) the ethylene-α-olefin copolymer and an olefin-based elastomer. And 0.5 to 50 parts by weight of cork powder having an average particle diameter of 200 to 3000 μm per 100 parts by weight of the ethylene-α-
A polyolefin-based resin sheet containing 0.5 to 10 parts by weight of a foaming agent per 100 parts by weight of the total amount of the olefin copolymer and the olefin-based elastomer, having an expansion ratio of 1.1 to 10 times, and At least one surface of the sheet has a groove depth of 50 to 4000 μm and a groove pitch of 5
A foamed sheet made of a polyolefin-based resin, wherein grains of 0 to 4000 μm are formed. 2. The method according to claim 1, wherein the olefin-based elastomer is ethylene-
The polyolefin resin foam sheet according to claim 1, which is a propylene elastomer. 3. A polyolefin resin foam sheet according to claim 1 or 2, which has a basis weight of 10 to 200 g /
A laminate formed by laminating m ² fibrous layers. 4. A bulletin board surface material comprising the laminate according to claim 3.