JPH1180401A - Thermoplastic resin foamed sheet and container - Google Patents
Thermoplastic resin foamed sheet and containerInfo
- Publication number
- JPH1180401A JPH1180401A JP9236731A JP23673197A JPH1180401A JP H1180401 A JPH1180401 A JP H1180401A JP 9236731 A JP9236731 A JP 9236731A JP 23673197 A JP23673197 A JP 23673197A JP H1180401 A JPH1180401 A JP H1180401A
- Authority
- JP
- Japan
- Prior art keywords
- weight
- parts
- container
- sheet
- resin
- 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
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Package Specialized In Special Use (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は電子レンジ耐熱性を
有し、使用後の減容廃棄性に優れ、かつまたパール調の
外観を有する熱可塑性樹脂発泡シート及びその成形容器
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foamed thermoplastic resin sheet having heat resistance in a microwave oven, excellent in volume reduction and disposal after use, and having a pearl-like appearance, and a molded container thereof.
【0002】[0002]
【従来の技術】生活習慣の変化に伴い近年コンビニエン
トストアー、スーパー等には調理済みの食品あるいは弁
当が多く販売されている。これらの食品は電子レンジで
再加熱して使用に供される事が多くそのため容器は電子
レンジ耐熱性を保有することが必須となっている。従
来、電子レンジ加熱対応の食品包装容器として、無機物
であるタルクをポリプロピレン系の樹脂に、全配合物に
対して30〜40重量%充填したシート(以下PP/F
シートという)を熱成形させた成形体が使用されてい
る。この成形体は、食品を充填した状態で電子レンジで
加熱しても、内部の食品の発熱による熱でも変形しない
容器として広く使用されている。2. Description of the Related Art In recent years, many cooked foods or bento have been sold to convenience stores, supermarkets and the like in accordance with changes in lifestyle. These foods are often used after being reheated in a microwave oven, and thus it is essential that the containers have microwave heat resistance. 2. Description of the Related Art Conventionally, as a food packaging container capable of heating in a microwave oven, a sheet (hereinafter referred to as PP / F) in which talc, which is an inorganic substance, is filled in a polypropylene-based resin in an amount of 30 to 40% by weight with respect to the total composition
(Referred to as a sheet) is used. This molded article is widely used as a container which is not deformed even when heated in a microwave oven in a state in which the food is filled, and is not deformed by heat generated by the food inside.
【0003】しかし、この容器は内容物を電子レンジで
加熱した際に容易に内容物の熱を通すため、加熱直後に
素手で持ちにくい問題がある。また、使用終了後に廃棄
する際容器が強靱で裂きにくく、また潰しにくいために
そのままの形状で廃棄しなければならずそのため廃棄物
の容量が増えてしまう問題がある。[0003] However, this container has a problem that it is difficult to hold it with bare hands immediately after heating since the heat of the content easily passes when the content is heated in a microwave oven. Further, there is a problem in that when the container is discarded after use, the container is tough and hard to tear and hard to be crushed, so that the container has to be discarded in the same shape and the capacity of the waste increases.
【0004】この問題を解決するにはPP/Fを発泡化
させることが考えられる。しかし単に発泡化したのでは
剛性が著しく低下してしまう。この剛性の低下を補うだ
け、成形体の肉厚を上げると、コスト高となってしま
う。薄肉で発泡ポリプロピレン系シートの剛性を上げる
方法としては、特開平1−278539号の公報でポリ
スチレン系樹脂を添加する事や、多層化手法として特開
平1−166942号の公報で公知である。しかし、特
開平1−278539号では充分な剛性を得る事が出来
ず、また、特開平1−166942号では、多層化の為
に高価なものとなってしまう問題がある。[0004] In order to solve this problem, foaming PP / F can be considered. However, simply foaming significantly reduces the rigidity. If the thickness of the molded body is increased to compensate for the decrease in rigidity, the cost increases. As a method for increasing the rigidity of a thin foamed polypropylene-based sheet, a method of adding a polystyrene resin in Japanese Patent Application Laid-Open No. 1-278439 and a method of forming a multilayered structure in Japanese Patent Application Laid-Open No. 1-166942 are known. However, Japanese Patent Application Laid-Open No. 1-278439 cannot provide sufficient rigidity, and Japanese Patent Application Laid-Open No. 1-166942 has a problem that it is expensive due to the multi-layer structure.
【0005】[0005]
【発明が解決しようとする課題】本発明は、130℃の
電子レンジ耐熱性を有し、実用的な強度を保持しながら
も、減容廃棄性、すなわち廃棄時に容器を容易に潰すこ
とができるためにゴミとなる容器の見かけの容量を減ら
すことができ、かつまた従来のPP/F製の容器にはな
かった、パール調の美麗な外観を有する熱可塑性樹脂発
泡シート及び容器を提供することを課題とする。DISCLOSURE OF THE INVENTION The present invention has a heat resistance of 130 ° C. in a microwave oven and retains practical strength, but also has a reduced volume disposal property, that is, a container can be easily crushed at the time of disposal. Therefore, it is possible to provide a thermoplastic resin foam sheet and a container having a beautiful pearl-like appearance, which can reduce the apparent capacity of a container which becomes garbage, and which is not present in conventional PP / F containers. As an issue.
【0006】[0006]
【課題を解決するための手段】本発明者らは、前述の問
題を解決するために種々検討した結果、ポリプロピレン
系樹脂、ポリスチレン系樹脂及び無機充填材からなる樹
脂組成物に対して特定の相溶化剤を併用して発泡化させ
たシート及び成形体が130℃の電子レンジ加熱対応の
耐熱性、減容廃棄性に優れ、環境適性(低燃焼カロリ
ー)を有しながら、比較的安価で剛性が高く、パール調
の外観を有する特性を持つ事を見出し、本発明を完成さ
せたものである。Means for Solving the Problems The present inventors have conducted various studies to solve the above-mentioned problems, and as a result, have found that a resin composition comprising a polypropylene resin, a polystyrene resin and an inorganic filler has a specific phase. Sheets and molded bodies foamed with the use of a solubilizing agent are relatively inexpensive and rigid, while having excellent heat resistance and volume reduction and disposal properties compatible with microwave oven heating at 130 ° C, and environmental suitability (low burning calories). The present invention has been found to have high characteristics and to have a pearl-like appearance, and has completed the present invention.
【0007】本発明の第1の発明は(A)ポリプロピレ
ン系樹脂40〜60重量部、(B)ポリスチレン系樹脂
10〜30重量部、(C)無機充填剤10〜40重量部
及び、(D)スチレンとイソプレンブロック共重合体水
素添加物3〜20重量部を含有する発泡倍率が1.05
〜3倍の熱可塑性樹脂発泡シートである。The first invention of the present invention comprises (A) 40 to 60 parts by weight of a polypropylene resin, (B) 10 to 30 parts by weight of a polystyrene resin, (C) 10 to 40 parts by weight of an inorganic filler, and (D) ) Foaming ratio containing 3 to 20 parts by weight of hydrogenated styrene and isoprene block copolymer is 1.05.
It is a thermoplastic resin foam sheet of up to three times.
【0008】第2の発明は(A)ポリプロピレン系樹脂
40〜60重量部、(B)ポリスチレン系樹脂10〜3
0重量部、(C)無機充填剤10〜40重量部及び、
(D)スチレン及び共役ジエン炭化水素よりなるブロッ
ク共重合体2〜20重量部を含有する発泡倍率が1.0
5〜3倍の熱可塑性樹脂発泡シートである。The second invention comprises (A) 40 to 60 parts by weight of a polypropylene resin, and (B) 10 to 3 parts of a polystyrene resin.
0 parts by weight, (C) 10 to 40 parts by weight of an inorganic filler, and
(D) an expansion ratio containing 2 to 20 parts by weight of a block copolymer composed of styrene and a conjugated diene hydrocarbon is 1.0
5 to 3 times the thermoplastic resin foam sheet.
【0009】第3の発明は、第1または第2の発明の熱
可塑性樹脂発泡シートよりなる電子レンジ加熱可能であ
ることを特徴とする成形容器である。According to a third aspect of the present invention, there is provided a molded container comprising the thermoplastic resin foam sheet according to the first or second aspect of the present invention, which can be heated in a microwave oven.
【0010】第4の発明は、食品が充填された第3の発
明の成形容器である。A fourth invention is the molded container according to the third invention, which is filled with food.
【0011】[0011]
【発明の実施の形態】以下、本発明を詳細に説明する。
本発明でいうポリプロピレン系樹脂とは、プロピレンを
単独重合することによって得られるプロピレン単独重合
体(以下PPホモポリマー)、又は20重量%以下のコ
モノマー、例えばエチレン、アクリル酸エステル、マレ
イン酸等の不飽和有機酸及びその無水物、炭素数が4〜
12個のα−オレフィン等のモノマー単位をプロピレン
と共重合して得られる共重合体が挙げられる。該共重合
体はランダム共重合体でもブロック共重合体でもグラフ
ト共重合体でもよい。また、ポリプロピレン系樹脂主鎖
に放射線照射等の方法で長鎖のポリプロピレンを分岐鎖
として導入したものも挙げられる。もしくはこれらの重
合体の酸化・塩素化等の変成物でもよい。本発明の実施
に当たりポリプロピレン系樹脂はこれらを単独で使用し
ても、2種以上を使用しても良い。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
The term "polypropylene resin" as used in the present invention refers to a propylene homopolymer (hereinafter referred to as PP homopolymer) obtained by homopolymerizing propylene, or a copolymer such as ethylene, acrylate or maleic acid having a content of 20% by weight or less. Saturated organic acid and its anhydride, having 4 to 4 carbon atoms
Copolymers obtained by copolymerizing 12 monomer units such as α-olefin with propylene are exemplified. The copolymer may be a random copolymer, a block copolymer, or a graft copolymer. Further, there may be mentioned those obtained by introducing a long-chain polypropylene as a branched chain into a polypropylene-based resin main chain by a method such as irradiation with radiation. Alternatively, modified products such as oxidation and chlorination of these polymers may be used. In carrying out the present invention, these polypropylene resins may be used alone or in combination of two or more.
【0012】本発明のポリスチレン系樹脂とは、ポリス
チレンホモポリマー(以下GP−PSという)、あるい
は、スチレンと他の1つ以上のコモノマー、例えばα−
メチルスチレン、アクリロニトリル、ブタジエン、メタ
クリル酸メチル、アクリル酸、メタアクリル酸、無水マ
レイン酸等との共重合体が挙げられる。また、スチレン
−ブタジエン共重合体成分をポリスチレンとグラフト重
合した、通常HI−PSと称されるゴム補強ポリスチレ
ンも使用出来る。これらは併用することもできる。これ
らの内ポリスチレン系樹脂としては、特に経済性の面か
らGP−PSが、望ましい。The polystyrene resin of the present invention may be a polystyrene homopolymer (hereinafter referred to as GP-PS), or styrene and one or more other comonomers, for example, α-
Copolymers with methylstyrene, acrylonitrile, butadiene, methyl methacrylate, acrylic acid, methacrylic acid, maleic anhydride and the like can be mentioned. Further, a rubber-reinforced polystyrene generally called HI-PS obtained by graft-polymerizing a styrene-butadiene copolymer component with polystyrene can also be used. These can be used in combination. Of these, GP-PS is preferable as the polystyrene resin, particularly from the viewpoint of economy.
【0013】本発明の無機充填材としては、タルク、ク
レー、マイカ、ケイ酸カルシウム、モンモリナイト、ベ
ントナイト、シリカ、アルミナ、酸化チタン、酸化鉄、
酸化亜鉛、酸化マグネシウム、軽石、水酸化アルミニウ
ム、水酸化マグネシウム、塩基性炭酸マグネシウム、リ
ン酸アルミニウム、炭酸カルシウム、ドロマイト、硫酸
カルシウム、亜硫酸カルシウム、硫酸バリウム、カーボ
ンブラック、ホワイトカーボン、ゼオライト、ガラス粉
末、大谷石、シラスバルーン、ガラスバルーン等が挙げ
られるが、特にこれらの中でも好ましくは、酸に対する
安定性やその取り扱い、経済性の面でタルクが好適に用
いられる。The inorganic filler of the present invention includes talc, clay, mica, calcium silicate, montmorillonite, bentonite, silica, alumina, titanium oxide, iron oxide,
Zinc oxide, magnesium oxide, pumice, aluminum hydroxide, magnesium hydroxide, basic magnesium carbonate, aluminum phosphate, calcium carbonate, dolomite, calcium sulfate, calcium sulfite, barium sulfate, carbon black, white carbon, zeolite, glass powder, Oya stone, shirasu balloon, glass balloon and the like can be mentioned, and among them, talc is particularly preferably used in terms of acid stability, handling and economy.
【0014】本発明において熱可塑性樹脂は、発泡シー
ト、成形体の外観及び成形体の諸物性の点から、ポリプ
ロピレン系樹脂が40〜60重量部、ポリスチレン系樹
脂が10〜30重量部の範囲が好ましい。ポリプロピレ
ン系樹脂が少なすぎると、電子レンジ耐熱性が得られ
ず、ポリスチレン系樹脂が少なすぎると、シート、成形
体の剛性を向上させる事が出来ない。In the present invention, the thermoplastic resin is preferably in the range of 40 to 60 parts by weight of the polypropylene resin and 10 to 30 parts by weight of the polystyrene resin from the viewpoint of the appearance of the foamed sheet and the molded article and the physical properties of the molded article. preferable. If the amount of the polypropylene-based resin is too small, the heat resistance of the microwave oven cannot be obtained. If the amount of the polystyrene-based resin is too small, the rigidity of the sheet or the molded product cannot be improved.
【0015】本発明の樹脂組成物の配合比は、シート、
成形体の剛性、環境適性及びシートから成形体への成形
性の点から、無機充填材が10〜40重量部の範囲が好
ましい。無機充填材が10重量部未満では、剛性、環境
適性が得られず、40重量部を越えるとシートから成形
体への成形性が著しく低下する。The mixing ratio of the resin composition of the present invention is as follows: sheet,
The inorganic filler is preferably in the range of 10 to 40 parts by weight from the viewpoints of the rigidity of the molded body, environmental suitability, and moldability from the sheet to the molded body. If the amount of the inorganic filler is less than 10 parts by weight, rigidity and environmental suitability cannot be obtained, and if it exceeds 40 parts by weight, the moldability from a sheet to a formed body is significantly reduced.
【0016】本発明における樹脂組成物の発泡倍率は、
シート、成形体としての剛性、経済性の点から1.05
〜3倍の範囲が好ましく、更に好ましくは1.1から
1.5倍の範囲である。発泡倍率が小さすぎると経済性
を改善する効果に乏しく、逆に大きすぎると所定の剛性
を得るのに、シート厚みをより以上に増す必要が生じ、
経済性の点で劣る。The expansion ratio of the resin composition of the present invention is as follows:
1.05 from the viewpoint of rigidity and economical efficiency as a sheet or molded body
The range is preferably from 3 to 3 times, more preferably from 1.1 to 1.5 times. If the expansion ratio is too small, the effect of improving economic efficiency is poor, and if it is too large, to obtain a predetermined rigidity, it is necessary to increase the sheet thickness more,
Poor in economics.
【0017】本発明において、実施組成物を発泡させる
には発泡剤を用いる方法が好適に使用される。この場合
発泡剤は特に限定されず、化学発泡剤、物理発泡剤何れ
も各種の物が使用出来る。具体的には、化学発泡剤とし
てアゾジカルボンアミド、アゾビスイソブチロニトリ
ル、p−トルエンスルホニルヒドラジド等の有機系のも
の、炭酸水素ナトリウム、クエン酸ナトリウム等の無機
系発泡剤が挙げられる。物理発泡剤としては、プロパ
ン、ブタン、ペンタン、水、炭酸ガス、窒素等のものが
挙げられる。また、発泡剤として粉末状の物は、樹脂或
いは各種添加剤によってマスターバッチ化した物や、物
理発泡剤をベース樹脂に含浸した物を用いても良い。よ
り好適には、発泡剤として、表面外観の点から無機系発
泡剤が望ましい。In the present invention, a method using a foaming agent is suitably used for foaming the working composition. In this case, the foaming agent is not particularly limited, and various chemical foaming agents and physical foaming agents can be used. Specifically, examples of the chemical foaming agent include organic ones such as azodicarbonamide, azobisisobutyronitrile, and p-toluenesulfonyl hydrazide, and inorganic blowing agents such as sodium hydrogencarbonate and sodium citrate. Examples of the physical foaming agent include propane, butane, pentane, water, carbon dioxide, and nitrogen. In addition, the powdery material as the foaming agent may be a material that is made into a masterbatch with a resin or various additives, or a material in which a physical foaming agent is impregnated in a base resin. More preferably, the foaming agent is preferably an inorganic foaming agent from the viewpoint of surface appearance.
【0018】本発明において、必要に応じて樹脂添加剤
として、一般に使用されている着色剤、エチレンビスア
マイド等の滑剤、ヒンダードフェノール系やリン系の酸
化防止剤を添加しても良い。In the present invention, a colorant generally used, a lubricant such as ethylene bisamide, a hindered phenol-based or phosphorus-based antioxidant may be added as a resin additive, if necessary.
【0019】本発明において使用されるスチレン−イソ
プレンブロック共重合体水素添加物(以下SEPSとい
う)とは、スチレンからなる重合体ブロックA 1個以
上と、イソプレンからなる重合体ブロックB 1個以上
からなり、全体の数平均分子量が5,000から50
0,000の範囲にあり、重合体ブロックA全体の含有
率が10〜70重量%であるブロック共重合体であっ
て、かつ(AB)n又はA−(BA)n(nは整数で1
以上5以下)のブロック形態を有し、ブロックB全体の
脂肪族二重結合の少なくとも70%以上を水素添加して
得られる水素ブロック共重合体である。また、スチレン
及び共役ジエン炭化水素よりなるブロック共重合体(以
下STRという)とはスチレンからなる重合体ブロック
A 1個以上と、共役ジエン(ブタジエン、イソプレ
ン)からなる重合体ブロックB 1個以上からなり、全
体の数平均分子量が5,000から500,000の範
囲にあり、重合体ブロックA全体の含有率が10〜80
重量%であるブロック共重合体であって、かつ(AB)
n又はA−(BA)n(nは整数で1以上5以下)のブ
ロック形態を有するブロック共重合体である。The hydrogenated styrene-isoprene block copolymer (hereinafter referred to as SEPS) used in the present invention is composed of at least one polymer block A composed of styrene and at least one polymer block B composed of isoprene. The total number average molecular weight is from 5,000 to 50
A block copolymer having a content of the entire polymer block A of 10 to 70% by weight, and (AB) n or A- (BA) n (n is an integer of 1
The hydrogen block copolymer has a block form of (5 or less) and is obtained by hydrogenating at least 70% or more of the aliphatic double bond of the entire block B. The block copolymer (hereinafter referred to as STR) composed of styrene and conjugated diene hydrocarbon is composed of one or more polymer blocks A composed of styrene and one or more polymer blocks B composed of conjugated dienes (butadiene, isoprene). The total number average molecular weight is in the range of 5,000 to 500,000, and the content of the entire polymer block A is 10 to 80.
% By weight of the block copolymer, and (AB)
It is a block copolymer having a block form of n or A- (BA) n (n is an integer of 1 to 5).
【0020】SEPSの添加量は3〜20重量部が好ま
しく、STRの添加量は2〜20重量部が好ましい。こ
の範囲において実用的に適度な強度を有しながら、容器
を潰す際にそれを可能とする引き裂き強度等の物性がバ
ランスし減容廃棄することが可能となる。すなわち、実
用的には容器に惣菜等を入れて運搬しても容器が破損す
ることはなく、かつまた容器を廃棄する際に容器を潰
し、或いは裂いて見かけの容積を減らすことが可能とな
る。SEPS或いはSTRの添加量が少ないといずれの
場合もシートの強度、特に引き裂き強度が低下して好ま
しくない。逆に添加量が多すぎると強度が低下し柔軟と
なる。そのため容器に内容物をいれた時その重みで容器
の形状が変形して好ましくなく、電子レンジ耐熱性も低
下する。The added amount of SEPS is preferably 3 to 20 parts by weight, and the added amount of STR is preferably 2 to 20 parts by weight. In this range, physical properties such as tearing strength that enable the container to be crushed when the container is crushed are balanced, and the container can be discarded with reduced volume while having a practically appropriate strength. In other words, in practice, the container is not damaged even if the prepared food is put into the container and transported, and the apparent volume can be reduced by crushing or tearing the container when disposing the container. . If the amount of SEPS or STR is too small, the strength of the sheet, particularly the tear strength, is undesirably low in any case. Conversely, if the addition amount is too large, the strength decreases and the material becomes flexible. Therefore, when the contents are put into the container, the shape of the container is deformed by the weight, which is not preferable, and the heat resistance of the microwave oven is also reduced.
【0021】発泡シート製造に共する樹脂組成物は、発
泡剤を除いてシート押出し加工の前に予め単軸あるい
は、2軸押出機で溶融混合したものを用いても、溶融混
練せずにブレンド、ドライブレンドしたものを用いても
良い。また、無機充填剤の混合方法として、無機物をポ
リプロピレンに、予め高濃度で溶融混合してマスターバ
ッチ化したものを使用しても良い。The resin composition used in the production of a foamed sheet may be prepared by melt-mixing with a single-screw or twin-screw extruder prior to sheet extrusion, excluding the foaming agent, without using a melt-kneading process. Alternatively, a dry-blended product may be used. As a method of mixing the inorganic filler, a material obtained by melt-mixing an inorganic substance with polypropylene at a high concentration in advance and forming a master batch may be used.
【0022】本発明の発泡シートは、一般に使用されて
いる押出し加工法が適用でき、ダイとしては、Tダイ、
サーキュラーダイ及び異形ダイの何れであってもよい。
また、加飾等の為に、発泡シートに無発泡層を共押出し
や予めフィルム化した物を熱ラミネートする等の方法で
積層しても良い。For the foamed sheet of the present invention, a commonly used extrusion method can be applied.
Any of a circular die and a modified die may be used.
In addition, for decoration or the like, a non-foamed layer may be laminated on a foamed sheet by a method such as co-extrusion or heat lamination of a previously formed film.
【0023】本発明の成形体としては、本発明で得られ
る発泡シートを用い通常の熱成形、たとえば真空成形、
圧空成形、真空圧空成形、プラグアシスト成形、プレス
成形等により成形された物が挙げられる。As the molded article of the present invention, the foamed sheet obtained by the present invention is used for ordinary thermoforming such as vacuum forming.
Products formed by pressure molding, vacuum pressure molding, plug assist molding, press molding, and the like can be given.
【0024】このようにして得られた容器は、食品、惣
菜等の容器、或いは弁当容器として好適に使用される。
特に油の多い食品を用い、電子レンジデンカ化工熱して
も十分な耐熱性を有するため、変形したり、穴があいた
りするようなことはない。The container thus obtained is suitably used as a container for foods, prepared foods and the like, or as a lunch box container.
Particularly, a food containing a lot of oil is used, and even if it is heated by microwave oven, it has sufficient heat resistance, so that it is not deformed or punctured.
【0025】[0025]
【発明の効果】本発明による熱可塑性樹脂発泡シートを
用いた成形容器は、電子レンジにかけることができ、食
品、惣菜或いは弁当容器として好適に用いられる。The molded container using the thermoplastic resin foam sheet according to the present invention can be microwaved and is suitably used as a food, prepared food or lunch box container.
【0026】[0026]
【実施例】以下実施例により更に詳細に説明する。 (実施例1)メルトインデックスが9でランダム共重合
体であるポリプロピレン樹脂(グランドポリマー社製F
229D)50重量部、タルク(白石カルシウム社製、
タルクFVS)30重量部、ポリスチレン樹脂(電気化
学工業社製、HRM−5)20重量部、発泡剤(永和化
成社製、SC−K)0.25重量部、流動パラフィン
0.2重量部、SEPS(1)(クラレ社製、セプトン
2104、スチレンとイソプレンのトリブロック共重合
体の水添物、スチレン含量65重量%)をドライブレン
ドした後、65mmΦの単軸押出機にて樹脂温度236
℃、樹脂圧153kg/cm3、押出量77.9kg/
hの条件で厚さ0.6mmのシートを製造した。The present invention will be described in more detail with reference to the following examples. (Example 1) A polypropylene resin having a melt index of 9 and a random copolymer (F manufactured by Grand Polymer Co., Ltd.)
229D) 50 parts by weight, talc (manufactured by Shiraishi Calcium Co., Ltd.)
30 parts by weight of talc FVS), 20 parts by weight of a polystyrene resin (manufactured by Denki Kagaku Kogyo Co., HRM-5), 0.25 parts by weight of a blowing agent (manufactured by Eiwa Chemical Co., SC-K), 0.2 part by weight of liquid paraffin, After dry blending SEPS (1) (Kuraray Co., Ltd., Septon 2104, hydrogenated product of triblock copolymer of styrene and isoprene, styrene content 65% by weight), the resin temperature was 236 with a single screw extruder of 65 mmφ.
° C, resin pressure 153kg / cm3, extrusion rate 77.9kg /
A sheet having a thickness of 0.6 mm was manufactured under the condition of h.
【0027】シートの発泡倍率は1.22倍、シートの
押出方向と平行方向及び直行する方向の発泡セルの最大
径は各々237μ、100μであった。このシートにつ
いて以下の評価を行った。The expansion ratio of the sheet was 1.22 times, and the maximum diameters of the foam cells in the direction parallel to and perpendicular to the sheet extrusion direction were 237 μm and 100 μm, respectively. The following evaluation was performed on this sheet.
【0028】(1)デュポン衝撃 デュポン衝撃試験機(東洋精機製作所製)を用い、撃芯
先端直径1/2インチ、重錘100gでシートの50%
破壊エネルギーを測定した。(1) DuPont Impact Using a DuPont impact tester (manufactured by Toyo Seiki Seisaku-sho, Ltd.), 50% of the sheet with a tip diameter of 1/2 inch and a weight of 100 g was used.
The breaking energy was measured.
【0029】(2)手折り感 シートを幅25mm、長さ50mmに切り出し、長さ方向に
両端を折り曲げ、幅方向に折り目を入れた際にシートが
割れるかどうかを観察し、割れなかったものを○、割れ
のきっかけが発生した物を△、割れたものを×とした。(2) Feeling of hand folding A sheet is cut into a width of 25 mm and a length of 50 mm, both ends are bent in the length direction, and it is observed whether or not the sheet is broken when the crease is formed in the width direction. 、, a substance having a trigger for cracking was rated as △, and a cracked one was rated as ×.
【0030】(3)引裂強度 JIS K−6772に準拠した。すなわち、幅40mm
長さ150mmの試験片を資料の縦及び横の方向からそれ
ぞれ3枚ずつとり、各試験片の短辺の中央から長辺に平
行に内部へ長さ約75mmに切り込みを入れる。試験片の
切り込みを入れた辺の両側が表裏になるように引張試験
機のつかみ具に取り付け、切り込みの方向に平行に毎分
200±20mmの引っ張り速度で引き裂き、最大荷重を
求める。方向は切り込みの方向を示す。(3) Tear strength: Based on JIS K-6772. That is, width 40mm
Three test pieces each having a length of 150 mm are taken from the vertical and horizontal directions of the sample, and a cut is made into the inside of each test piece to a length of about 75 mm from the center of the short side to the inside in parallel with the long side. The test piece is attached to a gripper of a tensile tester such that both sides of the cut side are turned upside down, and the test piece is torn in parallel with the cut direction at a pulling speed of 200 ± 20 mm / min to determine a maximum load. The direction indicates the direction of the cut.
【0031】シートから真空成形で図1の様な形状の弁
当容器をつくり、以下の試験を行った。 (1)落下強度 弁当容器に300gの重りを全体に均一になるよう固定
し、50cmから短手方向の縁が垂直になる方向で落下
させて、弁当容器が破壊するかどうかをみた。なお、蓋
は用いなかった。 (2)オーブン耐熱性 弁当容器を130℃のギヤオーブンに10分間放置して
容器の変形の有無をみた。 (3)電子レンジ耐熱性 弁当容器に食用サラダ油を8分目(約300g)を入れ
て、5分間蓋なしで電子レンジ加熱し、容器の変形、油
もれの有無等をみた。実施例1の組成を表1に、評価結
果を表2に示す。A lunch box having a shape as shown in FIG. 1 was prepared from the sheet by vacuum forming, and the following test was conducted. (1) Drop strength A 300 g weight was fixed to the lunch container so as to be uniform, and dropped from 50 cm in a direction in which the edge in the short direction became vertical to see if the lunch container was broken. Note that no lid was used. (2) Oven heat resistance The lunch container was left in a 130 ° C. gear oven for 10 minutes to check for deformation of the container. (3) Heat resistance of microwave oven The edible salad oil was put into a lunch box for 8 minutes (about 300 g), heated in a microwave oven without a lid for 5 minutes, and the deformation of the container, the presence or absence of oil leakage and the like were examined. Table 1 shows the composition of Example 1 and Table 2 shows the evaluation results.
【0032】[0032]
【表1】 [Table 1]
【0033】[0033]
【表2】 [Table 2]
【0034】(実施例2)票1に示された原料を単軸押
出機で事前に混練りした以外は実施例1と同様に行っ
た。(Example 2) The same procedure as in Example 1 was carried out except that the raw materials shown in the form 1 were previously kneaded by a single screw extruder.
【0035】(実施例3)表1に示された原料を二軸押
出機で事前に混練りした以外は実施例1と同様に行っ
た。Example 3 The same procedure as in Example 1 was carried out except that the raw materials shown in Table 1 were previously kneaded with a twin-screw extruder.
【0036】(実施例4)表1の様にSEPS(1)を
10重量部とした以外は実施例1と同様に行った。Example 4 The procedure of Example 1 was repeated except that SEPS (1) was changed to 10 parts by weight as shown in Table 1.
【0037】(実施例5)SEPS(1) 5重量部と
PS 10重量部を混合した後、PS 10重量部と混
合した以外は実施例1と同様に行った。Example 5 The same operation as in Example 1 was carried out except that 5 parts by weight of SEPS (1) and 10 parts by weight of PS were mixed, and then mixed with 10 parts by weight of PS.
【0038】(実施例6)SEPS(1)の代わりにS
EPS(2)(クラレ社製、セプトン2043、スチレ
ンとイソプレンのトリブロック共重合体の水添物、スチ
レン含量13重量%)を用いた以外は実施例1と同様に
行った。(Embodiment 6) S instead of SEPS (1)
The procedure was performed in the same manner as in Example 1 except that EPS (2) (manufactured by Kuraray Co., Ltd., Septon 2043, hydrogenated product of a triblock copolymer of styrene and isoprene, styrene content: 13% by weight) was used.
【0039】(実施例7)SEPS(1)の代わりにS
TR(電気化学工業社製STR−1602、スチレンと
ブタジエンのトリブロック共重合体)を2.5重量部用
いた以外は実施例1と同様に行った。(Embodiment 7) S instead of SEPS (1)
The same procedure was performed as in Example 1 except that 2.5 parts by weight of TR (STR-1602, manufactured by Denki Kagaku Kogyo KK, triblock copolymer of styrene and butadiene) was used.
【0040】(実施例8)SEPS(1)の代わりにS
TR(電気化学工業社製STR−1602、スチレンと
ブタジエンのトリブロック共重合体)を5重量部用いた
以外は実施例1と同様に行った。(Embodiment 8) S instead of SEPS (1)
The same operation as in Example 1 was performed except that TR (STR-1602, manufactured by Denki Kagaku Kogyo KK, triblock copolymer of styrene and butadiene) was used in an amount of 5 parts by weight.
【0041】(比較例1)ポリプロピレン樹脂50重量
部、タルク30重量部、ポリスチレン樹脂20重量部、
発泡剤0.25重量部、流動パラフィン0.2重量部を
ドライブレンドした後、65mmΦの単軸押出機にて樹
脂温度228℃、樹脂圧140kg/cm3、押出量7
7.4kg/hの条件で厚さ0.6mmのシートを製造
した。配合組成を表3に示す。Comparative Example 1 50 parts by weight of a polypropylene resin, 30 parts by weight of talc, 20 parts by weight of a polystyrene resin,
After dry blending 0.25 parts by weight of a foaming agent and 0.2 parts by weight of liquid paraffin, the resin temperature was 228 ° C., the resin pressure was 140 kg / cm 3, and the throughput was 7 using a 65 mmφ single screw extruder.
A sheet having a thickness of 0.6 mm was manufactured under the condition of 7.4 kg / h. Table 3 shows the composition.
【0042】[0042]
【表3】 [Table 3]
【0043】シートの発泡倍率は1.19倍、シートの
押出方向と平行方向及び直行する方向の発泡セルの最大
径は各々208μ、78μであった。このシート及びシ
ートより成形された弁当容器について実施例と同様の評
価を行った。評価結果を表4に示す。The expansion ratio of the sheet was 1.19 times, and the maximum diameters of the foam cells in the direction parallel to and perpendicular to the sheet extrusion direction were 208 μm and 78 μm, respectively. The same evaluation as in the example was performed for the sheet and the lunch container formed from the sheet. Table 4 shows the evaluation results.
【0044】[0044]
【表4】 [Table 4]
【0045】(比較例2)表3の様にSEBS(旭化成
社製、タフテック H1041、スチレンとブタジエン
のトリブロック共重合体の水添物)5重量部を添加した
以外は実施例1と同様に行った。Comparative Example 2 As in Table 3, the same procedure as in Example 1 was carried out except that 5 parts by weight of SEBS (Taftec H1041, manufactured by Asahi Kasei Corporation, a hydrogenated product of a triblock copolymer of styrene and butadiene) was added. went.
【0046】(比較例3)票2の様にSEBC(日本合
成ゴム社製、ダイナロン 4600P、スチレン−ブタ
ジエン−オレフィン結晶ブロック共重合体の水添物)5
重量部を添加した以外は実施例1と同様に行った。Comparative Example 3 SEBC (Dynallon 4600P, hydrogenated product of styrene-butadiene-olefin crystal block copolymer, manufactured by Nippon Synthetic Rubber Co.)
The procedure was performed in the same manner as in Example 1 except that parts by weight were added.
【0047】(比較例4)SEPS2.5重量部を添加
した以外は実施例1と同様に行った。(Comparative Example 4) The same operation as in Example 1 was carried out except that 2.5 parts by weight of SEPS was added.
【0048】SEPS(1)を25重量部添加した以外
は実施例1と同様に行った。The procedure was performed in the same manner as in Example 1 except that 25 parts by weight of SEPS (1) was added.
【0049】市販のPP/Fについて評価を行った、組
成を表3に、評価結果を表4に示す。Table 3 shows the composition of the commercially available PP / F, and Table 4 shows the evaluation results.
【図1】 実施例で容器の物性を測定する際に使用した
容器の形状図。FIG. 1 is a shape diagram of a container used when measuring physical properties of the container in Examples.
Claims (4)
重量部、(B)ポリスチレン系樹脂10〜30重量部、
(C)無機充填剤10〜40重量部及び、(D)スチレ
ン−イソプレンブロック共重合体水素添加物3〜20重
量部を含有する発泡倍率が1.05〜3倍の熱可塑性樹
脂発泡シート。(A) Polypropylene resin 40 to 60
Parts by weight, (B) 10 to 30 parts by weight of a polystyrene resin,
A thermoplastic resin foam sheet containing (C) 10 to 40 parts by weight of an inorganic filler and (D) 3 to 20 parts by weight of a hydrogenated styrene-isoprene block copolymer and having an expansion ratio of 1.05 to 3 times.
重量部、(B)ポリスチレン系樹脂10〜30重量部、
(C)無機充填剤10〜40重量部及び、(D)スチレ
ン及び共役ジエン炭化水素よりなるブロック共重合体2
〜20重量部を含有する発泡倍率が1.05〜3倍の熱
可塑性樹脂発泡シート。2. (A) Polypropylene resin 40 to 60
Parts by weight, (B) 10 to 30 parts by weight of a polystyrene resin,
(C) 10 to 40 parts by weight of an inorganic filler and (D) a block copolymer 2 composed of styrene and a conjugated diene hydrocarbon
A foamed thermoplastic resin sheet having a foaming ratio of 1.05 to 3 times containing 〜20 parts by weight.
ートよりなる電子レンジ加熱可能であることを特徴とす
る成形容器。3. A molded container comprising the thermoplastic resin foam sheet according to claim 1 and capable of being heated in a microwave oven.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23673197A JP3789212B2 (en) | 1997-09-02 | 1997-09-02 | Thermoplastic resin foam sheet and container |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23673197A JP3789212B2 (en) | 1997-09-02 | 1997-09-02 | Thermoplastic resin foam sheet and container |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH1180401A true JPH1180401A (en) | 1999-03-26 |
JP3789212B2 JP3789212B2 (en) | 2006-06-21 |
Family
ID=17004960
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23673197A Expired - Fee Related JP3789212B2 (en) | 1997-09-02 | 1997-09-02 | Thermoplastic resin foam sheet and container |
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Country | Link |
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JP (1) | JP3789212B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000027906A1 (en) * | 1998-11-11 | 2000-05-18 | Kaneka Corporation | Extrusion-foamed board of resin blend comprising modified polypropylene resin and polystyrene resin |
JP2006076590A (en) * | 2004-09-08 | 2006-03-23 | Denki Kagaku Kogyo Kk | Container for heating in microwave oven |
CN110291154A (en) * | 2017-02-21 | 2019-09-27 | 普立万公司 | Super vibration damping thermoplastic elastomer (TPE) blend and the low-gravity product thus prepared |
-
1997
- 1997-09-02 JP JP23673197A patent/JP3789212B2/en not_active Expired - Fee Related
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000027906A1 (en) * | 1998-11-11 | 2000-05-18 | Kaneka Corporation | Extrusion-foamed board of resin blend comprising modified polypropylene resin and polystyrene resin |
US6262138B1 (en) | 1998-11-11 | 2001-07-17 | Kaneka Corporation | Extrusion-foamed board of resin blend comprising modified polypropylene resin and polystyrene resin |
JP2006076590A (en) * | 2004-09-08 | 2006-03-23 | Denki Kagaku Kogyo Kk | Container for heating in microwave oven |
CN110291154A (en) * | 2017-02-21 | 2019-09-27 | 普立万公司 | Super vibration damping thermoplastic elastomer (TPE) blend and the low-gravity product thus prepared |
Also Published As
Publication number | Publication date |
---|---|
JP3789212B2 (en) | 2006-06-21 |
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