JP2003251769A - Foamed laminated sheet of antistatic polypropylene resin and packaging molding - Google Patents
Foamed laminated sheet of antistatic polypropylene resin and packaging moldingInfo
- Publication number
- JP2003251769A JP2003251769A JP2002057017A JP2002057017A JP2003251769A JP 2003251769 A JP2003251769 A JP 2003251769A JP 2002057017 A JP2002057017 A JP 2002057017A JP 2002057017 A JP2002057017 A JP 2002057017A JP 2003251769 A JP2003251769 A JP 2003251769A
- Authority
- JP
- Japan
- Prior art keywords
- polypropylene resin
- sheet
- layer
- antistatic
- foamed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はポリプロピレン系樹
脂積層発泡シート及びそのシートを熱成形した包装用成
形体に関する。更に詳しくは、緩衝性及び帯電防止性に
優れ、特に電子部品の包装体として優れた保護性能を有
する発泡容器等の成形体及びその基材となるポリプロピ
レン系樹脂積層発泡シートに関する。尚、本発明で
「部」等の組成を表す単位は、特にことわらない限り樹
脂成分の合計を１００部としたときの質量基準で表す。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polypropylene resin laminated foam sheet and a molded article for packaging obtained by thermoforming the sheet. More specifically, the present invention relates to a molded product such as a foamed container having excellent cushioning properties and antistatic properties and particularly excellent protection performance as a package for electronic parts, and a polypropylene resin laminated foamed sheet as a base material thereof. In the present invention, the unit expressing the composition such as “part” is expressed on a mass basis when the total of the resin components is 100 parts, unless otherwise specified.
【０００２】[0002]
【従来の技術】電子部品等を包装する際、振動や衝撃な
どから製品の損傷を防ぐため、緩衝性を備えるポリプロ
ピレン系樹脂等の発泡体が使用されていて、中でもポリ
プロピレン系樹脂発泡シートを熱成形した容器等の包装
体は、ポリプロピレン系樹脂が耐熱性や耐溶剤性に優れ
ていることや、そのシートを熱成形して複雑な形状を比
較的容易に得られることから、前記の電子部品の包装体
に適している。2. Description of the Related Art When packaging electronic parts and the like, in order to prevent the product from being damaged by vibration or shock, foam such as polypropylene-based resin having a cushioning property is used. Since the polypropylene-based resin has excellent heat resistance and solvent resistance and the sheet can be thermoformed into a complicated shape relatively easily, a package such as a molded container is used for the electronic component described above. Suitable for packaging.
【０００３】しかし、通常のポリプロピレン系樹脂発泡
シートを熱成形した成形体では、大型の液晶パネルのよ
うな重量が大きい製品の包装体として用いると、搬送時
の落下等により外部から衝撃が加わった時に、緩衝性は
優れているので、内容物の保護機能を有するものの、成
形体の耐衝撃強度が十分でなく、該成形体自体が割れて
しまうという問題点があった。このような割れの問題を
解消する方法としては、一般的には発泡倍率を高くした
低密度で、比較的厚みの大きな成形体とすることが行わ
れているが、この方法では、発泡シートを熱成形して包
装用成形体にする際に、発泡シートの賦形性が悪く、所
望の形状を有する成形体を得ることが困難となり、高い
寸法精度が要求される電子部品等の包装には適さない。However, when a molded product obtained by thermoforming an ordinary polypropylene resin foam sheet is used as a package for a product having a large weight such as a large liquid crystal panel, an impact is applied from the outside due to a drop during transportation. At the same time, although the cushioning property is excellent, it has a function of protecting the contents, but the impact resistance of the molded product is not sufficient, and the molded product itself is broken. As a method of solving such a problem of cracking, generally, a low-density molded body having a high expansion ratio and a relatively large thickness are used. When it is thermoformed into a molded article for packaging, the shapeability of the foamed sheet is poor, making it difficult to obtain a molded article having the desired shape, and for packaging electronic parts that require high dimensional accuracy. Not suitable.
【０００４】一方で発泡倍率の低い包装用成形体では、
寸法精度は比較的良好であるが、前記のように耐緩衝強
度が十分でなく、特に重量の大きな電子部品の包装用と
しては、より高い耐衝撃性を有する発泡シートが求めら
れていた。On the other hand, in a molded article for packaging having a low expansion ratio,
Although the dimensional accuracy is relatively good, the cushioning strength is not sufficient as described above, and there is a demand for a foamed sheet having higher impact resistance especially for packaging of heavy electronic components.
【０００５】また、ポリプロピレン系樹脂発泡シート及
び熱成形した容器のようなプラスチックの発泡体は絶縁
体であることから帯電性が高く、電子部品に対して静電
気によりその機能を喪失させる問題が起きる。また、包
装体表面に静電気が帯電すると、塵埃が付着し包装体と
して不適となるという問題点もある。Further, since a plastic foam such as a polypropylene-based resin foam sheet and a thermoformed container is an insulator, it has a high chargeability, and there is a problem that the electronic component loses its function due to static electricity. Further, when static electricity is charged on the surface of the packaging body, there is a problem that dust adheres to the surface of the packaging body and is unsuitable as a packaging body.
【０００６】このような問題を解決するために、発泡シ
ート及び熱成形した包装体の表面抵抗値を低減して帯電
防止性を付与する方法が知られており、発泡シートの成
形時にカーボンを混合することや、発泡体表面に帯電防
止剤を塗布することが行われている。しかし、前者の方
法では、発泡体表面の脆性が高くなり、電子部品等の内
容物を収納して輸送する際の振動等で、発泡体と内容物
の摩擦により発泡体自身やカーボンの粉が発生して、内
容物に付着して電気的障害が起こす問題があり、又後者
の方法では、輸送時に塗布された帯電防止剤が電子部品
等の内容物に移行して、内容物を汚染するといった問題
があり、これらの問題を改善した包装体が望まれてい
た。In order to solve such a problem, a method of reducing the surface resistance value of the foamed sheet and the thermoformed package to impart antistatic property is known, and carbon is mixed at the time of molding the foamed sheet. And the antistatic agent is applied to the surface of the foam. However, in the former method, the brittleness of the foam surface becomes high, and the foam itself and the carbon powder are rubbed due to the friction between the foam and the contents due to vibration when the contents such as electronic parts are stored and transported. There is a problem that it is generated and adheres to the contents to cause an electrical trouble, and in the latter method, the antistatic agent applied during transportation is transferred to the contents such as electronic parts and contaminates the contents. Therefore, there has been a demand for a package that improves these problems.
【０００７】[0007]
【発明が解決しようとする課題】本発明は、輸送中の振
動又は落下等の衝撃に対する耐衝撃強度に優れ、且つ優
れた帯電防止性を有し、表面平滑性及び寸法精度が良好
で内容物等との摩擦による静電気のトラブルを防止する
機能を有した、電子部品等の包装用成形体及びその基材
となる発泡シートを提供することであり、特に重量の大
きな電子部品の包装に適した発泡包装体を提供すること
を課題とする。DISCLOSURE OF THE INVENTION The present invention is excellent in impact resistance against shock such as vibration or drop during transportation, has excellent antistatic property, and has good surface smoothness and dimensional accuracy. The present invention is to provide a molded article for packaging electronic parts and the like and a foamed sheet as a base material thereof, which has a function of preventing static electricity caused by friction with the like, and is particularly suitable for packaging heavy electronic parts. An object is to provide a foamed package.
【０００８】[0008]
【課題を解決するための手段】本発明者等は、前記課題
の解決手段を鋭意検討した結果、大型の電子部品等の重
量が大きい内容物の輸送用の包装体としては、単に帯電
防止性能を持つ包装体の緩衝性を向上させただけでは不
十分で、緩衝性に加えて衝撃が加わった時に、包装体自
体の変形を最小限に抑えるだけの強度を持つことが必要
であり、その手段として比較的低発泡倍率の発泡層と帯
電防止性を有する非発泡層を積層することが有効である
ことを見出し本発明に至った。Means for Solving the Problems As a result of earnest studies on the means for solving the above problems, the inventors of the present invention have found that as a package for transporting heavy contents such as large electronic parts, the antistatic performance is simply used. It is not enough to improve the cushioning property of the packaging body that has, and in addition to the cushioning property, it is necessary to have the strength that minimizes the deformation of the packaging body itself when an impact is applied. As a means, it was found that it is effective to laminate a foamed layer having a relatively low expansion ratio and a non-foamed layer having an antistatic property, and the present invention has been completed.
【０００９】即ち、ポリプロピレン系樹脂発泡層（Ａ）
の少なくとも片面に、帯電防止剤を配合してなる未発泡
のポリプロピレン系樹脂層（Ｂ）を有した積層シートで
あって、該積層発泡シートの密度が１８０ｋｇｍ-3以上
８５０ｋｇｍ-3未満であり且つデュポン衝撃強度が０．
６J以上であり、更に表面抵抗率が１０12Ω／□未満で
ある帯電防止性ポリプロピレン系樹脂積層発泡シートで
あり、該積層発泡シートは、共押出法により製造された
ものが好ましい。又該積層発泡シートは、下記の１から
４のいずれか一以上の要件を具備することが好ましい。
１．ポリプロピレン系樹脂発泡層が２００℃における溶
融張力が４．０ｇ以上である高溶融張力ポリプロピレン
系樹脂１００〜６０部と、直鎖状の結晶性ポリプロピレ
ン系樹脂４０〜０部を含有してなる。
２．帯電防止性ポリプロピレン系樹脂積層発泡シートの
平均気泡径が押出し方向で３００μｍ以下、押出し方向
と直角方向で２００μｍ以下、厚み方向で１００μｍ以
下である。
３．シート厚みが０．５ｍｍ以上２．５ｍｍ未満であ
る。又、一方で本発明は、前記のポリプロピレン系樹脂
積層発泡シートからなる包装用成形体である。That is, the polypropylene resin foam layer (A)
A laminated sheet having an unfoamed polypropylene-based resin layer (B) formed by blending an antistatic agent on at least one side thereof, wherein the laminated foamed sheet has a density of 180 kgm -3 or more and less than 850 kgm -3. DuPont impact strength is 0.
It is an antistatic polypropylene resin laminated foam sheet having a surface resistivity of 6 J or more and less than 10 12 Ω / □, and the laminated foam sheet is preferably produced by a coextrusion method. Further, it is preferable that the laminated foam sheet has any one or more of the following requirements 1 to 4. 1. The polypropylene resin foam layer contains 100 to 60 parts of a high melt tension polypropylene resin having a melt tension of 4.0 g or more at 200 ° C. and 40 to 0 parts of a linear crystalline polypropylene resin. 2. The average cell diameter of the antistatic polypropylene-based resin laminated foam sheet is 300 μm or less in the extrusion direction, 200 μm or less in the direction perpendicular to the extrusion direction, and 100 μm or less in the thickness direction. 3. The sheet thickness is 0.5 mm or more and less than 2.5 mm. On the other hand, the present invention is a molded article for packaging comprising the above polypropylene resin laminated foam sheet.
【００１０】[0010]
【発明の実施の形態】以下、本発明を詳細に説明する。
本発明の積層発泡シートは、ポリプロピレン系樹脂発泡
層（Ａ）と帯電防止性の未発泡のポリプロピレン系樹脂
層（Ｂ）から構成されるポリプロピレン系樹脂積層発泡
シート（以下単に「積層発泡シート」と略す）である。
本発明の積層発泡シートの一例の断面図を図１に示す。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
The laminated foam sheet of the present invention comprises a polypropylene resin foam layer (A) and an antistatic unfoamed polypropylene resin layer (B) (hereinafter simply referred to as "laminated foam sheet"). Abbreviated).
A cross-sectional view of an example of the laminated foam sheet of the present invention is shown in FIG.
【００１１】本発明で、ポリプロピレン系樹脂発泡層
（Ａ）（以下単に「発泡層（Ａ）」と略す）に用いるポ
リプロピレン系樹脂とは、プロピレンモノマーを主成分
として重合してなる単独重合体又は共重合体である。例
えばプロピレン系単独重合体、プロピレン−エチレン共
重合体、及びプロピレン−エチレン−ジエン共重合体等
のポリプロピレンを主とする重合体等であり、好ましく
は、高溶融張力ポリプロピレン系樹脂単独もしくは、該
樹脂を６０部以上、直鎖状の結晶性ポリプロピレン系樹
脂を４０部以下含有する樹脂組成物である。In the present invention, the polypropylene resin used for the polypropylene resin foam layer (A) (hereinafter simply referred to as "foam layer (A)") is a homopolymer obtained by polymerizing propylene monomer as a main component or It is a copolymer. For example, a propylene-based homopolymer, a propylene-ethylene copolymer, and a polymer mainly composed of polypropylene such as propylene-ethylene-diene copolymer, and the like, preferably a high melt tension polypropylene-based resin alone or the resin Is 60 parts or more and a linear crystalline polypropylene-based resin is 40 parts or less.
【００１２】本発明でいう高溶融張力ポリプロピレン系
樹脂とは、２００℃における溶融張力が４．０ｇ以上で
あるポリプロピレン系樹脂であって、メルトインデック
ス（ＭＩ）が１０ｇ／１０分以下であることが好まし
い。２００℃のおける溶融張力が４．０ｇ未満である
と、発泡シートの製膜時に気泡の連通化及び発泡ガスの
逸散が起こり良好な発泡シートを得ることが困難になる
ことがある。また、メルトインデックス（ＭＩ）が１０
ｇ／１０分未満の場合も、同様の理由により発泡シート
の製膜が困難になることがある。又、前記のように、こ
のような問題を生じない範囲で、前記の他のポリプロピ
レン系樹脂を混合することができ、特に直鎖状の結晶性
ポリプロピレン系樹脂は、気泡の連続化や発泡ガスの逸
散が起こりにくく、好ましくは４０部以下、更に好まし
くは３０部以下の範囲で混合できる。この直鎖状の結晶
性ポリプロピレン系樹脂が４０部を越えると、発泡シー
トの発泡セルが肥大化し外観が不良になる可能性があ
り、又この発泡シートを熱成形する際のいわゆるドロー
ダウンも大きくなることがあり好ましくない。The high melt tension polypropylene resin as used in the present invention is a polypropylene resin having a melt tension at 200 ° C. of 4.0 g or more and a melt index (MI) of 10 g / 10 minutes or less. preferable. If the melt tension at 200 ° C. is less than 4.0 g, bubbles may be communicated with each other and a foaming gas may escape during film formation of the foamed sheet, which may make it difficult to obtain a good foamed sheet. Also, the melt index (MI) is 10
Even if it is less than g / 10 minutes, it may be difficult to form a foamed sheet for the same reason. Further, as described above, the other polypropylene-based resin described above can be mixed in a range that does not cause such a problem. Particularly, the linear crystalline polypropylene-based resin can be used for continuous bubbles or foaming gas. Is less likely to occur, and the mixing can be performed in a range of preferably 40 parts or less, more preferably 30 parts or less. If this linear crystalline polypropylene-based resin exceeds 40 parts, the foamed cells of the foamed sheet may be enlarged and the appearance may be deteriorated, and the so-called drawdown at the time of thermoforming this foamed sheet is also large. May occur, which is not preferable.
【００１３】直鎖状の結晶性ポリプロピレン系樹脂は市
販されているものを使用することができるが、高溶融張
力ポリプロピレン系樹脂と同様に、メルトインデックス
（ＭＩ）が１０ｇ／１０分以下のものが好ましい。As the linear crystalline polypropylene resin, a commercially available one can be used, but like the high melt tension polypropylene resin, one having a melt index (MI) of 10 g / 10 minutes or less is preferable. preferable.
【００１４】本発明は、前記のように発泡層（Ａ）の少
なくとも片面に未発泡のポリプロピレン系樹脂層（Ｂ）
（以下「未発泡層（Ｂ）」と略す）を有した積層シート
であり、本発明の目的は片面に積層したものでも達成で
きるが、耐衝撃強度や、静電気トラブルの抑制という観
点からは両面に積層したものが好ましい。この未発泡層
に用いる樹脂としては、一般にポリプロピレンとして市
販されているものを使用することができ、メルトインデ
ックス（ＭＩ）が１０ｇ／１０分以下のものが好まし
い。例えばプロピレン系単独重合体、プロピレンとプロ
ピレン以外のエチレン、１−ブテン、１−ペンテン、１
−ヘキセン等のα−オレフィンとのランダムまたはブロ
ック共重合体、さらにこれらの重合体が挙げられ、その
中でも、プロピレン単独重合体、プロピレン−エチレン
ランダム重合体、及びポリプロピレン成分及びプロピレ
ン−エチレンランダム共重合体を含むブロック共重合体
が好ましい。又、ポリプロピレン系樹脂を主成分とし
て、少量であれば混和性の良好な他の樹脂を混合したも
のでも差し支えなく、このような樹脂の例としてポリエ
チレン、エチレン酢酸ビニル共重合体等がある。In the present invention, as described above, the unfoamed polypropylene resin layer (B) is formed on at least one surface of the foamed layer (A).
It is a laminated sheet having (hereinafter abbreviated as “unfoamed layer (B)”), and the object of the present invention can be achieved by laminating it on one side, but from the viewpoint of impact strength and suppression of electrostatic trouble, it is double-sided. It is preferable that the layers are laminated. As the resin used for the non-foamed layer, a resin which is generally commercially available as polypropylene can be used, and a resin having a melt index (MI) of 10 g / 10 minutes or less is preferable. For example, propylene-based homopolymer, propylene and ethylene other than propylene, 1-butene, 1-pentene, 1
-Random or block copolymers with α-olefins such as hexene, and also these polymers, among them, propylene homopolymer, propylene-ethylene random polymer, and polypropylene component and propylene-ethylene random copolymer Block copolymers including coalesces are preferred. In addition, a polypropylene-based resin as a main component and a small amount of another resin having good miscibility may be mixed, and examples of such a resin include polyethylene and ethylene-vinyl acetate copolymer.
【００１５】未発泡層（Ｂ）は、前記の樹脂に帯電防止
剤を添加して形成される。この帯電防止剤としては、四
級アンモニウム塩、脂肪酸多価アルコールエステル、ポ
リオキシエチレン付加物やポリエ−テルエステルアミド
樹脂等が挙げられるが特に限定されるものではない。本
発明においては、帯電防止剤の添加量は、後述する表面
抵抗値によって規定されるが、一般的にはポリプロピレ
ン系樹脂層（Ｂ）の樹脂成分に対して１．０〜４．０部
である。１部未満では十分な表面抵抗値が得にくい場合
があり、４．０部より多いと内容物の表面を汚染する可
能性がある。又帯電防止剤は、未発泡層（Ｂ）にのみ添
加すればいいので、本発明においては添加量が少なくて
十分な効果が得られる。The unfoamed layer (B) is formed by adding an antistatic agent to the above resin. Examples of the antistatic agent include quaternary ammonium salts, fatty acid polyhydric alcohol esters, polyoxyethylene adducts, and polyetheresteramide resins, but are not particularly limited. In the present invention, the addition amount of the antistatic agent is defined by the surface resistance value described later, but is generally 1.0 to 4.0 parts with respect to the resin component of the polypropylene resin layer (B). is there. If it is less than 1 part, it may be difficult to obtain a sufficient surface resistance value, and if it is more than 4.0 parts, the surface of the contents may be contaminated. Further, since the antistatic agent only needs to be added to the unfoamed layer (B), the addition amount is small in the present invention and a sufficient effect can be obtained.
【００１６】本発明の積層発泡シートの密度は１８０ｋ
ｇｍ-3以上８５０ｋｇｍ-3未満である。密度が１８０ｋ
ｇｍ-3より低い場合、発泡シートの熱成形時の所望の形
状の成形型への賦形性が低下し、成形体の寸法精度が低
下する。また、発泡セルの独立気泡率が低下し、容器等
の包装体を成形した場合に成形体の表面外観性が低下す
る。密度が８５０ｋｇｍ-3以上であると緩衝性及び軽量
性が低下する。The laminated foam sheet of the present invention has a density of 180 k.
gm -3 or more and less than 850 kgm -3 . Density is 180k
If it is lower than gm −3 , the shapeability of the foamed sheet into a molding die having a desired shape at the time of thermoforming will be deteriorated, and the dimensional accuracy of the molded body will be deteriorated. In addition, the closed cell rate of the foamed cells decreases, and the surface appearance of the molded product deteriorates when a package such as a container is molded. When the density is 850 kgm -3 or more, the cushioning property and the lightness are reduced.
【００１７】本発明の積層発泡シートは、デュポン衝撃
強度が０．６Ｊ以上であることが重要である。本発明で
いうデュポン衝撃強度とは、ＪＩＳで記載されているＫ
−７２１１試験法に基づき、１／２インチ半球状衝撃
新、荷重２００ｇ、環境温度２３℃において測定した５
０％衝撃破壊エネルギー値である。積層発泡シートのデ
ュポン衝撃強度が０．６Ｊ未満であると、シートを熱成
形した容器等の成形体を電子部品の包装体として用いた
場合に、搬送時の落下等により外部から衝撃が加わった
時に包装体の割れが発生してしまい、特に大型の液晶パ
ネルの搬送用として使用する場合には０．６Ｊ以上のデ
ュポン衝撃強度を有する発泡シートでないと包装材料と
しての機能が不十分である。It is important that the laminated foam sheet of the present invention has a DuPont impact strength of 0.6 J or more. The DuPont impact strength referred to in the present invention is the K described in JIS.
Measured under a 1/2 inch hemispherical impact test, a load of 200 g, and an ambient temperature of 23 ° C. based on the −7211 test method.
It is a 0% impact fracture energy value. When the DuPont impact strength of the laminated foam sheet is less than 0.6 J, when a molded body such as a container formed by thermoforming the sheet is used as a packaging body for electronic parts, an impact is applied from the outside due to a drop during transportation or the like. At times, the package is cracked, and particularly when it is used for transporting a large liquid crystal panel, the function as a packaging material is insufficient unless it is a foam sheet having a DuPont impact strength of 0.6 J or more.
【００１８】デュポン衝撃強度は、発泡層（Ａ）に未発
泡層（Ｂ）を積層することで著しく向上し、未発泡層
（Ｂ）に用いるポリプロピレン系樹脂の種類や、その厚
さに大きく依存する。従って未発泡層（Ｂ）の層厚は、
デュポン衝撃強度を０．６J以上になるように設定する
ことが重要であるが、一般的には３０μｍ以上が望まし
い。The DuPont impact strength is remarkably improved by laminating the unfoamed layer (B) on the foamed layer (A) and greatly depends on the type of polypropylene resin used for the unfoamed layer (B) and its thickness. To do. Therefore, the layer thickness of the unfoamed layer (B) is
It is important to set the DuPont impact strength to 0.6 J or more, but generally 30 μm or more is desirable.
【００１９】一方で、本発明の積層発泡シートの表面抵
抗値は１０12Ω／□未満である。表面抵抗値が１０12Ω
／□以上となると、発泡体表面の帯電により静電気が発
生し、塵埃が付着することにより電子部品の包装体とし
て不適となる。さらに帯電した静電気によって、これら
部品や機器がその機能を喪失するという事態が起きてし
まう。On the other hand, the surface resistance value of the laminated foam sheet of the present invention is less than 10 12 Ω / □. Surface resistance value is 10 12 Ω
If it is / square or more, static electricity is generated due to electrostatic charge on the surface of the foam, and dust is attached to the foam, which makes it unsuitable as a package for electronic parts. Furthermore, the static electricity that has been charged causes a situation in which these parts and devices lose their functions.
【００２０】本発明の積層発泡シートは、前記のポリプ
ロピレン系樹脂と発泡剤からなる樹脂組成物と、帯電防
止剤を配合してなるポリプロピレン系樹脂の樹脂組成物
を共押出成形する方法により効率良く製造することがで
きる。各種の樹脂成分及び帯電防止剤の混合方法は特に
限定されないが、積層発泡シート成形時に押出機へ攪拌
混合した原料を直接投入する方法、または攪拌混合した
原料を単軸または二軸押出機にて溶融混合してペレット
化し、発泡押出時に使用する方法等を用いることができ
る。The laminated foam sheet of the present invention is efficiently produced by a method of coextrusion molding the resin composition of the polypropylene resin and the foaming agent and the resin composition of the polypropylene resin containing the antistatic agent. It can be manufactured. The mixing method of the various resin components and the antistatic agent is not particularly limited, but a method of directly charging the agitated and mixed raw material to the extruder at the time of forming the laminated foam sheet, or a single-screw or twin-screw extruder of the agitated and mixed material. It is possible to use a method such as a method of melt-mixing and pelletizing, which is used during foaming extrusion.
【００２１】発泡剤としては化学発泡剤と物理発泡剤が
ある。化学発泡剤としては、重曹とクエン酸の混合物が
好適に用いられ、発生する発泡ガスは炭酸ガスである。
化学発泡剤の添加方法は特に限定されず、高溶融張力ポ
リプロピレン系樹脂と直鎖状の結晶性ポリプロピレン系
樹脂の樹脂組成物にドライブレンドする方法や、押出機
のホッパー中で定量フィーダーを使用して添加する方
法、或いはポリプロピレン系樹脂やポリエチレン樹脂等
のポリオレフィン系樹脂をベースとするマスターバッチ
を作成し添加する方法等を用いることができる。化学発
泡剤の添加量は所望の発泡倍率を得られる範囲でありそ
の具体的な量は発泡剤の種類によっても異なるが、樹脂
成分１００部に対して、０．１〜３．０部添加すること
が好ましい。添加量が０．１部未満では所望の発泡倍率
を得ることが出来ず、３．０部を超えて添加した場合
は、押出機中における発泡剤の均一分散及び十分な分解
が進行せず、良好な発泡剤を得ることが出来ない場合が
ある。The foaming agent includes a chemical foaming agent and a physical foaming agent. As the chemical foaming agent, a mixture of sodium bicarbonate and citric acid is preferably used, and the generated foaming gas is carbon dioxide gas.
The method of adding the chemical foaming agent is not particularly limited, and a method of dry blending with a resin composition of a high melt tension polypropylene resin and a linear crystalline polypropylene resin, or a quantitative feeder in a hopper of an extruder is used. And a method of adding a master batch based on a polyolefin resin such as a polypropylene resin or a polyethylene resin can be used. The addition amount of the chemical foaming agent is within a range capable of obtaining a desired foaming ratio, and its specific amount varies depending on the type of the foaming agent, but is 0.1 to 3.0 parts with respect to 100 parts of the resin component. It is preferable. If the addition amount is less than 0.1 part, the desired expansion ratio cannot be obtained. If the addition amount exceeds 3.0 parts, uniform dispersion and sufficient decomposition of the foaming agent in the extruder do not proceed, In some cases, a good foaming agent cannot be obtained.
【００２２】物理発泡剤としては炭酸ガス、ブタン等が
例示されるが、安全性の面で炭酸ガスが好適に用いられ
る。物理発泡剤の添加方法としては、二軸押出機の中央
ゾーンまたはタンデム押出機の１段目押出機の中央ゾー
ンに供給する方法等が挙げられる。物理発泡剤の添加量
は所望の発泡倍率を得られる範囲であり、１．２〜３．
０部であることが好ましい。添加量が１．２部未満では
所望の発泡倍率を得ることが出来ず、３．０部を超えて
添加した場合は、独立気泡率が低下する場合がある。Examples of the physical foaming agent include carbon dioxide gas, butane and the like, and carbon dioxide gas is preferably used in terms of safety. Examples of the method of adding the physical foaming agent include a method of supplying to the central zone of the twin-screw extruder or the central zone of the first-stage extruder of the tandem extruder. The addition amount of the physical foaming agent is within a range in which a desired foaming ratio can be obtained, and 1.2 to 3.
It is preferably 0 part. If the amount added is less than 1.2 parts, the desired expansion ratio cannot be obtained, and if it exceeds 3.0 parts, the closed cell ratio may decrease.
【００２３】該積層発泡シートを製造する際に、発泡層
（Ａ）及び未発泡層（Ｂ）には、物性を阻害しない範囲
で、所望の気泡調整剤、架橋剤、発泡助剤、充填剤、安
定剤、酸化防止剤、顔量等を混合することができる。In producing the laminated foamed sheet, the foamed layer (A) and the non-foamed layer (B) have desired cell-adjusting agents, crosslinking agents, foaming aids, and fillers as long as the physical properties are not impaired. , A stabilizer, an antioxidant, a face amount and the like can be mixed.
【００２４】又、本発明の積層発泡シートの製造方法と
しては、公知の発泡成形方法及び通常の複数の押出成形
機でフィードブロック法またはマルチマニホールド法を
用いた共押出成形方法を適用することが出来る。As the method for producing the laminated foamed sheet of the present invention, a known foaming molding method or a coextrusion molding method using a feed block method or a multi-manifold method with a plurality of ordinary extruders can be applied. I can.
【００２５】本発明の積層発泡シートの押出し方向の平
均気泡径は好ましくは３００μｍ以下、より好ましくは
２５０μｍ以下で、更に好ましくは２００μｍ以下であ
り、押出し方向と直角方向の平均気泡径はこのましくは
２００μｍ以下、より好ましくは１５０μｍ以下であ
り、厚み方向の平均気泡径は好ましくは１００μｍ以
下、より好ましくは８０μｍ以下である。気泡径が大き
くなると、シート中の気泡がつながってしまういわゆる
連続気泡化が起こり、連続気泡の割合が大きくなるとシ
ートの外観が悪くなり好ましくない。The average cell diameter in the extrusion direction of the laminated foam sheet of the present invention is preferably 300 μm or less, more preferably 250 μm or less, still more preferably 200 μm or less, and the average cell diameter in the direction perpendicular to the extrusion direction is preferably. Is 200 μm or less, more preferably 150 μm or less, and the average cell diameter in the thickness direction is preferably 100 μm or less, more preferably 80 μm or less. When the cell diameter is large, so-called open cells are formed in which the cells in the sheet are connected, and when the proportion of the open cells is large, the appearance of the sheet is deteriorated, which is not preferable.
【００２６】該積層発泡シートの厚みは、０．５ｍｍ以
上２．５ｍｍ未満であることが好ましく、より好ましく
は０．８ｍｍ以上２．０ｍｍ未満、更に好ましいのは
１．０ｍｍ以上１．８ｍｍ未満である。厚みが薄いと、
得られる発泡シートの剛性が低下し、厚いと熱成形の際
の予備加熱時間が長くなり生産性が低下する。The thickness of the laminated foam sheet is preferably 0.5 mm or more and less than 2.5 mm, more preferably 0.8 mm or more and less than 2.0 mm, still more preferably 1.0 mm or more and less than 1.8 mm. is there. If the thickness is thin,
When the foamed sheet obtained has a low rigidity and is thick, the preheating time during thermoforming becomes long and the productivity decreases.
【００２７】本発明の積層発泡シートは、熱成形して成
形体とし、特に電子部品の包装用のトレー、コンテナ及
びその他の容器、もしくは支持枠等の包装体として好適
に用いることができる。熱成形とは、一般的に言われて
いるような成形シートを加熱軟化させて、軟らかい間に
外力を加えて成形する方法である。熱成形には外力とし
て空気を用いる方法として真空成形と圧空成形の二通り
がある。またシートの加熱方法としてヒーターによる間
接加熱方法と熱板にシートを接触させて加熱させる直接
加熱方法と熱風により加熱する方法がある。また、成形
型の凹凸の組み合わせやプラグ使用など、補助エアーの
使用など多くの成形方法が知られている。例えば、スト
レート真空成形、ストレート圧空成形、ドレープ真空成
形、ドレープ圧空成形、プラグアシスト成形、ドレープ
アンドプラグアシスト成形、プラグアシスト圧空成形、
プラグアシストリバースドロー成形、エアクション成
形、プラグアシストエアストリップ成形、マッチモール
ド（プレス）成形などがあげられ、それらのいずれの方
法を用いても良い。The laminated foamed sheet of the present invention is thermoformed into a molded product, which can be suitably used as a package for trays, containers and other containers for packaging electronic parts, or a support frame. Thermoforming is a method which is generally called to heat and soften a formed sheet and apply an external force to the formed sheet while it is soft. In thermoforming, there are two methods of using air as an external force: vacuum forming and pressure forming. As a method for heating the sheet, there are an indirect heating method using a heater, a direct heating method in which the sheet is brought into contact with a hot plate to heat the sheet, and a method in which the sheet is heated by hot air. In addition, many molding methods are known, such as the combination of unevenness of a molding die and the use of plugs, such as the use of auxiliary air. For example, straight vacuum forming, straight pressure forming, drape vacuum forming, drape pressure forming, plug assist forming, drape and plug assist forming, plug assist air forming,
Examples of the method include plug assist reverse draw molding, action molding, plug assist air strip molding, match mold (press) molding, and any of these methods may be used.
【００２８】[0028]
【実施例】以下、実施例により本発明を具体的に説明す
る。EXAMPLES The present invention will be specifically described below with reference to examples.
【００２９】以下の実施例及び比較例において用いた測
定方法は下記の方法にて行った。The measuring methods used in the following examples and comparative examples were as follows.
【００３０】（シート密度） ミラージュ貿易社製電子
比重計（ＭＤ−２００Ｓ）にて測定した。(Sheet Density) It was measured with an electronic hydrometer (MD-200S) manufactured by Mirage Trading Co., Ltd.
【００３１】（デュポン衝撃強度） 東洋精機社製デュ
ポン衝撃試験機にて１／２インチ半球状衝撃芯、荷重２
００ｇ、環境温度２３℃において測定した。結果はＪＩ
Ｓ−Ｋ７２１１の５０％衝撃破壊エネルギー値（単位：
Ｊ）で結果を表示した。(DuPont Impact Strength) With a DuPont impact tester manufactured by Toyo Seiki, 1/2 inch hemispherical impact core, load 2
It was measured at 00 g and an ambient temperature of 23 ° C. The result is JI
50% impact fracture energy value of S-K7211 (unit:
The results are displayed in J).
【００３２】（表面抵抗率） 三菱化学社製ハイレスタ
−ＵＰ（ＭＣＰ−ＨＴ４５０，ＪボックスＵタイプ）を
使用し、印加電圧５００Ｖ、測定時間６０秒、環境温度
２３℃、環境湿度５５％にて測定を行った。(Surface Resistivity) Measured using Mitsubishi Chemical's Hiresta-UP (MCP-HT450, J box U type) at an applied voltage of 500 V, a measuring time of 60 seconds, an environmental temperature of 23 ° C. and an environmental humidity of 55%. I went.
【００３３】（気泡径） シート表面及び断面方向から
拡大顕微鏡にて観察し、５０個の気泡径の押出し方向
（ＭＤ）および押出し方向と直角方向（ＴＤ）の平均値
から平均気泡径を求めた。(Bubble Diameter) The average bubble diameter was determined from the average value of 50 bubble diameters in the extruding direction (MD) and the direction perpendicular to the extruding direction (TD) by observing the sheet surface and the cross sectional direction with a magnifying glass. .
【００３４】（実用落下試験） 発泡シートを真空成形
機にて図２、図３に示す形状（縦４００ｍｍ、横３００
ｍｍ、深さ４５ｍｍ）のトレーに成形し、その中に３０
０ｍｍ×２００ｍｍ×厚さ１０ｍｍ、重量７００ｇの金
属板を入れ、それを１０段重ねた状態で段ボールに入れ
た。トレイ１０段を詰めた段ボール箱を、高さ９００ｍ
ｍから段ボールの１角及び稜角３箇所、更に６面を一回
ずつ落としトレイの破損状態を評価した。評価基準：○
＝破損なし、×破損有り。(Practical Drop Test) The foamed sheet was shaped by a vacuum forming machine as shown in FIGS. 2 and 3 (length 400 mm, width 300).
mm, depth 45 mm) into a tray with 30
A metal plate having a size of 0 mm × 200 mm × thickness 10 mm and a weight of 700 g was put, and the metal plate was put in a corrugated board in a state of stacking 10 layers. A cardboard box packed with 10 trays, height 900m
From m, one corner and three ridge angles of the corrugated board and six sides were dropped once, and the damage state of the tray was evaluated. Evaluation criteria: ○
= No damage, × Damage.
【００３５】（実施例１〜４、比較例１〜２）表１に示
す基材発泡層及び表皮層の配合組成物を、各々東芝機械
社製９０ｍｍ単軸押出機（Ｌ／Ｄ＝３４）とプラコー社
製４０ｍｍ単軸押出機にて同時に押出、それぞれの溶融
樹脂を三和精工社製２種３層フィードブロックにて合流
させ、７５０ｍｍ巾Ｔダイスより押出を行い、シート厚
み１．０ｍｍの各発泡シートを製膜した。得られた積層
発泡シートの各層の構成比及びシート密度の測定結果を
表１に示す。なお、表１中の２００℃における溶融張力
の測定方法は、東洋精機製作所製キャピログラフを用い
て、装置のバレル内にてポリプロピレンを２００℃で５
分間加熱して溶融し、溶融したポリプロピレンを直径
２．０９５ｍｍ、長さ８ｍｍ、Ｌ／Ｄ＝３．８のキャピ
ラリーから１５ｍｍ／分の速度で大気中に押出してスト
ランドとし、このストランドを２．０ｍ／分の速度で引
き取る際の張力を測定した値である。(Examples 1 to 4 and Comparative Examples 1 and 2) The compounded compositions of the base material foam layer and the skin layer shown in Table 1 were each manufactured by Toshiba Machine Co., Ltd. 90 mm single screw extruder (L / D = 34). Simultaneously extruded with a 40 mm single-screw extruder manufactured by Placo Co., and each molten resin was merged by a Sanwa Seiko Co., Ltd. type 2 three-layer feed block, and extruded from a 750 mm width T die to obtain a sheet thickness of 1.0 mm Each foamed sheet was formed into a film. Table 1 shows the measurement results of the composition ratio and sheet density of each layer of the obtained laminated foam sheet. In addition, the method for measuring the melt tension at 200 ° C. in Table 1 was to measure polypropylene at 200 ° C. in a barrel of the apparatus using a Capillograph manufactured by Toyo Seiki Seisakusho.
It is heated and melted for a minute, and the melted polypropylene is extruded into a strand from a capillary having a diameter of 2.095 mm, a length of 8 mm and L / D = 3.8 at a speed of 15 mm / min to form a strand, and the strand is 2.0 m. It is a value obtained by measuring the tension when the film is taken up at a speed of / min.
【００３６】[0036]
【表１】 [Table 1]
【００３７】高溶融張力ＰＰ：ＭＩ＝３．０ｇ／分 結晶性ＰＰ：ＭＩ＝４．０ｇ／分 発泡剤ＣＦ：重曹・クエン酸系の化学発泡剤 帯電防止剤：花王社製ＴＳ−３Ｂ ＭＩ：２３０℃測定値（ＪＩＳ−Ｋ６７５８法）High melt tension PP: MI = 3.0 g / min Crystalline PP: MI = 4.0 g / min Foaming agent CF: baking soda / citric acid type chemical foaming agent Antistatic agent: TS-3B manufactured by Kao Corporation MI: 230 ° C measured value (JIS-K6758 method)
【００３８】表２に各積層発泡シートのデュポン衝撃強
度、表面抵抗率、気泡径、実用落下試験の測定結果を示
す。Table 2 shows the measurement results of DuPont impact strength, surface resistivity, bubble diameter, and practical drop test of each laminated foam sheet.
【００３９】[0039]
【表２】 [Table 2]
【００４０】各実施例の積層発泡シートは、衝撃強度に
優れ、シート表面の表面抵抗率が低いことから静電気の
発生を防止することができ、実用落下試験における積層
発泡シート成形品の破損がみられないことから、電子部
品等の梱包剤として優れた性能を有している。The laminated foamed sheets of the respective examples are excellent in impact strength and have a low surface resistivity on the surface of the sheet, so that the generation of static electricity can be prevented. Therefore, it has excellent performance as a packing material for electronic parts.
【００４１】[0041]
【発明の効果】本発明の帯電防止性ポリプロピレン系樹
脂積層発泡シートを熱成形した包装体は、衝撃強度が高
く、表面の帯電防止性に優れ、特に電子部品の包装体と
して使用した際に、外部からの衝撃による破壊および静
電気の発生による電気的な障害からの電子部品の保護性
能に優れ、表面外観が良好である。The package formed by thermoforming the antistatic polypropylene resin laminated foam sheet of the present invention has high impact strength and excellent antistatic property on the surface, and particularly when used as a package for electronic parts, Excellent protection of electronic parts from electrical damage caused by external impact and static electricity, and good surface appearance.
【図１】 本発明の帯電防止性ポリプロピレン系樹脂積
層発泡シートの一例を示す断面図である。FIG. 1 is a cross-sectional view showing an example of an antistatic polypropylene resin laminated foam sheet of the present invention.
【図２】 本発明の一例のトレーの断面図である。FIG. 2 is a cross-sectional view of an example tray of the present invention.
【図３】 本発明の一例のトレーの平面図である。FIG. 3 is a plan view of an example tray of the present invention.
１． 発泡層 ２． 帯電防止性未発泡層 1. Foam layer 2. Antistatic unfoamed layer
フロントページの続き Ｆターム(参考） 3E086 AB01 AD05 BA04 BA15 BB35 BB84 CA31 3E096 AA06 BA08 BB03 CA06 CC01 DA04 DB08 DC01 EA03X EA11X FA03 FA07 FA09 FA20 GA11 4F100 AK07A AK07B AL05A BA02 BA10A BA10B BA16 CA22B DJ01A EH20 GB15 JA11A JA13A JA20 JA20A JG03 JG04 JK01 JK10 JK11 YY00 YY00A 4J002 BB121 BB122 BB151 GF00 GG02 Continued front page F term (reference) 3E086 AB01 AD05 BA04 BA15 BB35 BB84 CA31 3E096 AA06 BA08 BB03 CA06 CC01 DA04 DB08 DC01 EA03X EA11X FA03 FA07 FA09 FA20 GA11 4F100 AK07A AK07B AL05A BA02 BA10A BA10B BA16 CA22B DJ01A EH20 GB15 JA11A JA13A JA20 JA20A JG03 JG04 JK01 JK10 JK11 YY00 YY00A 4J002 BB121 BB122 BB151 GF00 GG02
Claims (4)
なくとも片面に、帯電防止剤を配合してなる未発泡のポ
リプロピレン系樹脂層（Ｂ）を有した積層発泡シートで
あって、該積層発泡シートの密度が１８０ｋｇｍ-3以上
８５０ｋｇｍ -3未満であり、且つデュポン衝撃強度が
０．６J以上であり、更に表面抵抗率が１０12Ω／□未
満である帯電防止性ポリプロピレン系樹脂積層発泡シー
ト。1. A small amount of polypropylene resin foam layer (A)
At least one side has an unfoamed porosity prepared by blending an antistatic agent.
A laminated foam sheet having a polypropylene resin layer (B)
And the density of the laminated foam sheet is 180 kgm-3that's all
850 kgm -3Less than, and the DuPont impact strength is
0.6J or more, and the surface resistivity is 1012Ω / □
Fully antistatic polypropylene resin laminated foam sheet
To.
泡層（Ａ）と未発泡のポリプロピレン系樹脂層（Ｂ）を
積層した請求項１に記載の帯電防止性ポリプロピレン系
樹脂積層発泡シート。2. The antistatic polypropylene resin laminated foam sheet according to claim 1, wherein the polypropylene resin foam layer (A) and the unfoamed polypropylene resin layer (B) are laminated by a coextrusion method.
を具備する請求項１又は請求項２に記載の帯電防止性ポ
リプロピレン系樹脂積層発泡シート。１．ポリプロピレ
ン系樹脂発泡層が２００℃における溶融張力が４．０ｇ
以上である高溶融張力ポリプロピレン系樹脂１００〜６
０部と、直鎖状の結晶性ポリプロピレン系樹脂４０〜０
部を含有してなる。２．帯電防止性ポリプロピレン系樹
脂積層発泡シートの平均気泡径が押出し方向で３００μ
ｍ以下、押出し方向と直角方向で２００μｍ以下、厚み
方向で１００μｍ以下である。３．シート厚みが０．５
ｍｍ以上２．５ｍｍ未満である。3. The antistatic polypropylene resin laminated foam sheet according to claim 1 or 2, which has any one or more of the following requirements 1 to 4. 1. The polypropylene resin foam layer has a melt tension of 4.0 g at 200 ° C.
High melt tension polypropylene resin 100 to 6 as described above
0 part and linear crystalline polypropylene resin 40-0
Parts. 2. The average cell diameter of the antistatic polypropylene resin laminated foam sheet is 300μ in the extrusion direction.
m or less, 200 μm or less in the direction perpendicular to the extrusion direction, and 100 μm or less in the thickness direction. 3. Sheet thickness is 0.5
mm or more and less than 2.5 mm.
電防止性ポリプロピレン系樹脂積層発泡シートからなる
包装用成形体。4. A molded article for packaging comprising the antistatic polypropylene resin laminated foam sheet according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002057017A JP4157310B2 (en) | 2002-03-04 | 2002-03-04 | Antistatic polypropylene-based resin laminated foam sheet and molded article for packaging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002057017A JP4157310B2 (en) | 2002-03-04 | 2002-03-04 | Antistatic polypropylene-based resin laminated foam sheet and molded article for packaging |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003251769A true JP2003251769A (en) | 2003-09-09 |
| JP4157310B2 JP4157310B2 (en) | 2008-10-01 |
Family
ID=28667389
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002057017A Expired - Fee Related JP4157310B2 (en) | 2002-03-04 | 2002-03-04 | Antistatic polypropylene-based resin laminated foam sheet and molded article for packaging |
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| Country | Link |
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| JP (1) | JP4157310B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005074771A (en) * | 2003-08-29 | 2005-03-24 | Jsp Corp | Polyolefinic resin foamed sheet |
| JP2005246799A (en) * | 2004-03-04 | 2005-09-15 | Asahi Kasei Chemicals Corp | Double-layered molded product |
| CN1325340C (en) * | 2003-12-19 | 2007-07-11 | 夏普株式会社 | Substrate accommodating tray |
| JP2008308695A (en) * | 2002-10-08 | 2008-12-25 | Jsp Corp | Foamed sheet |
| JP2009202603A (en) * | 2009-06-18 | 2009-09-10 | Asahi Kasei Chemicals Corp | Double-layered molded product |
| JP2010042556A (en) * | 2008-08-11 | 2010-02-25 | Jsp Corp | Polyolefin resin laminated foam |
| JP2011006567A (en) * | 2009-06-25 | 2011-01-13 | Jsp Corp | Polyolefin-based resin-foamed sheet |
| JP2011104890A (en) * | 2009-11-18 | 2011-06-02 | Sekisui Plastics Co Ltd | Resin foam sheet |
| JP2011162688A (en) * | 2010-02-10 | 2011-08-25 | Jsp Corp | Foamed sheet and interleaf for glass substrate comprising the foamed sheet |
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2002
- 2002-03-04 JP JP2002057017A patent/JP4157310B2/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008308695A (en) * | 2002-10-08 | 2008-12-25 | Jsp Corp | Foamed sheet |
| JP4493000B2 (en) * | 2003-08-29 | 2010-06-30 | 株式会社ジェイエスピー | Polyolefin resin foam sheet |
| JP2005074771A (en) * | 2003-08-29 | 2005-03-24 | Jsp Corp | Polyolefinic resin foamed sheet |
| CN1325340C (en) * | 2003-12-19 | 2007-07-11 | 夏普株式会社 | Substrate accommodating tray |
| US7579072B2 (en) | 2003-12-19 | 2009-08-25 | Sharp Kabushiki Kaisha | Substrate accommodating tray |
| JP4493372B2 (en) * | 2004-03-04 | 2010-06-30 | 旭化成ケミカルズ株式会社 | Multi-layer molded product |
| JP2005246799A (en) * | 2004-03-04 | 2005-09-15 | Asahi Kasei Chemicals Corp | Double-layered molded product |
| JP2010042556A (en) * | 2008-08-11 | 2010-02-25 | Jsp Corp | Polyolefin resin laminated foam |
| JP4636567B2 (en) * | 2008-08-11 | 2011-02-23 | 株式会社ジェイエスピー | Polyolefin resin laminate foam |
| KR101465807B1 (en) | 2008-08-11 | 2014-11-26 | 가부시키가이샤 제이에스피 | Polyolefin resin laminated foam |
| JP2009202603A (en) * | 2009-06-18 | 2009-09-10 | Asahi Kasei Chemicals Corp | Double-layered molded product |
| JP2011006567A (en) * | 2009-06-25 | 2011-01-13 | Jsp Corp | Polyolefin-based resin-foamed sheet |
| JP2011104890A (en) * | 2009-11-18 | 2011-06-02 | Sekisui Plastics Co Ltd | Resin foam sheet |
| JP2011162688A (en) * | 2010-02-10 | 2011-08-25 | Jsp Corp | Foamed sheet and interleaf for glass substrate comprising the foamed sheet |
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| JP4157310B2 (en) | 2008-10-01 |
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