JPH0424222B2 - - Google Patents
Info
- Publication number
- JPH0424222B2 JPH0424222B2 JP58140520A JP14052083A JPH0424222B2 JP H0424222 B2 JPH0424222 B2 JP H0424222B2 JP 58140520 A JP58140520 A JP 58140520A JP 14052083 A JP14052083 A JP 14052083A JP H0424222 B2 JPH0424222 B2 JP H0424222B2
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- polybutadiene
- polystyrene
- sheet
- styrene
- 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.)
- Expired - Lifetime
Links
- 239000005062 Polybutadiene Substances 0.000 claims description 18
- 229920002857 polybutadiene Polymers 0.000 claims description 18
- 239000004793 Polystyrene Substances 0.000 claims description 17
- 229920002223 polystyrene Polymers 0.000 claims description 17
- 229920001971 elastomer Polymers 0.000 claims description 14
- 239000005060 rubber Substances 0.000 claims description 14
- 239000004798 oriented polystyrene Substances 0.000 claims description 13
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 8
- 239000012778 molding material Substances 0.000 claims description 7
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 5
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims description 4
- 229920001400 block copolymer Polymers 0.000 claims description 3
- 229920001577 copolymer Polymers 0.000 claims 1
- 239000000203 mixture Substances 0.000 description 8
- 239000003921 oil Substances 0.000 description 7
- 238000003475 lamination Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 235000013305 food Nutrition 0.000 description 4
- 229920005669 high impact polystyrene Polymers 0.000 description 4
- 239000004797 high-impact polystyrene Substances 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 239000003925 fat Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- 239000008162 cooking oil Substances 0.000 description 1
- 238000009820 dry lamination Methods 0.000 description 1
- 239000008157 edible vegetable oil Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000009823 thermal lamination Methods 0.000 description 1
- 238000003856 thermoforming Methods 0.000 description 1
Landscapes
- Wrappers (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Laminated Bodies (AREA)
Description
【発明の詳細な説明】
本発明は、改良されたストレスクラツキング耐
性を有するポリスチレン系シート成形材料に関す
るものである。二軸延伸ポリスチレンシート（以
下OPSシートと略記する）は、透明で美しく、
剛性が高く、熱成形容易である為に、食品包装用
に適して居り、非常に大きな用途を有している。
然しこの材料は、ストレスクラツキングに対する
耐性が弱い為に、その用途分野を制限されてい
た。ここでストレスクラツキングと云うのは、例
えば、食用油脂、特に幾分酸化された食用油脂な
どを表面に付着させると、シート材料中に内在す
るストレスにより、クラツクを生じる現象であ
る。この為に、OPSシートは、油脂分の多い食
品などの包装には不適当であつた。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to polystyrene sheet molding materials with improved stress cracking resistance. Biaxially oriented polystyrene sheets (hereinafter abbreviated as OPS sheets) are transparent and beautiful.
Because it has high rigidity and can be easily thermoformed, it is suitable for food packaging and has a wide range of uses.
However, this material has limited application because of its poor resistance to stress cracking. Here, stress cracking is a phenomenon in which, for example, when edible fats and oils, particularly edible fats and oils that have been slightly oxidized, are attached to the surface, cracks occur due to stress inherent in the sheet material. For this reason, OPS sheets were unsuitable for packaging foods with a high oil and fat content.
本発明のシート成形材料は、上記の欠点を改良
したものである。本発明は、ポリブタジエン由来
の成分含有量が3.5乃至40％のゴム強化ポリスチ
レン二軸延伸フイルムを表面に張り合わせた透明
な二軸延伸ポリスチレンシート成形材料である。 The sheet molding material of the present invention has improved the above-mentioned drawbacks. The present invention is a transparent biaxially oriented polystyrene sheet molding material in which a rubber-reinforced polystyrene biaxially oriented film having a polybutadiene-derived component content of 3.5 to 40% is laminated on the surface.
ゴム強化ポリスチレン二軸延伸フイルムとは、
ゴム成分の混合により強化されたハイインパクト
ポリスチレンを二軸延伸したフイルムである。 What is rubber reinforced polystyrene biaxially oriented film?
This is a biaxially stretched film made of high-impact polystyrene reinforced by a mixture of rubber components.
混合されるゴム成分とは、ポリブタジエン又
は、スチレンブタジエンゴムにスチレンをグラフ
ト共重合させたゴム成分及びスチレンとブタジエ
ンとのブロツク共重合体よりなるゴム成分とを含
有する組成物、又はこれらゴム成分にポリスチレ
ンを混合した組成物である。 The rubber component to be mixed refers to a composition containing polybutadiene, a rubber component obtained by graft copolymerizing styrene to styrene-butadiene rubber, and a rubber component consisting of a block copolymer of styrene and butadiene, or a composition containing these rubber components. It is a composition mixed with polystyrene.
ゴム成分は上記のように、種々な状態で混合さ
れるが、ここでは、これらのゴム成分の含有量
を、赤外分析法により測定されるポリブタジエン
成分の濃度として表わすことによる。赤外分析法
で使用するポリブタジエン成分の特性吸収と濃度
との関係は、使用するゴムによりポリブタジエン
の構造が異るために、一律には決められないが、
使用するゴムを決めれば実測により決めることが
できる。 As mentioned above, the rubber components are mixed in various states, but here, the content of these rubber components is expressed as the concentration of the polybutadiene component measured by infrared analysis. The relationship between the characteristic absorption and concentration of the polybutadiene component used in infrared analysis cannot be determined uniformly because the structure of polybutadiene differs depending on the rubber used.
Once the rubber to be used is determined, it can be determined by actual measurements.
ポリブタジエンの由来成分含有量が合計3.5乃
至40％の範囲がよい。3.5％未満では、ストレス
クラツク耐性が不十分であり、40％を超えるとゴ
ム強化ポリスチレン二軸延伸フイルムのブロツキ
ング性が大きくなりOPSシートとの張り合わせ
加工適性が低下する。 The total content of components derived from polybutadiene is preferably in the range of 3.5 to 40%. If it is less than 3.5%, the stress crack resistance will be insufficient, and if it exceeds 40%, the blocking property of the rubber-reinforced polystyrene biaxially stretched film will increase and the suitability for lamination with the OPS sheet will decrease.
ゴム強化ポリスチレン二軸延伸フイルムと、
OPSシートとの張り合わせ加工は、接着剤を使
用するドライラミ法も用い得るが、加熱圧着のみ
による熱ラミ法が用い得る。熱ラミ法は生産性の
高い安価な張り合わせ加工法であり、本発明のた
めの張り合わせ加工法として特に有利である。 Rubber reinforced polystyrene biaxially stretched film,
For lamination processing with the OPS sheet, a dry lamination method using an adhesive can be used, but a hot lamination method using only heat and pressure bonding can be used. The thermal lamination method is a highly productive and inexpensive laminating method, and is particularly advantageous as a laminating method for the present invention.
ゴム強化ポリスチレン二軸延伸フイルムの厚み
は、8μ乃至50μ程度の範囲が適当である。薄すぎ
るフイルムは、加工時に切れ易く、又、厚すぎる
フイルムは、熱ラミの際に、速度をあげることが
困難になる。フイルムは、OPSシートの両面に
張り合わせてもよいが、油との接触が片面に限ら
れる場合には、片面だけに張り合わせることもで
きる。 The thickness of the rubber-reinforced polystyrene biaxially stretched film is suitably in the range of about 8μ to 50μ. A film that is too thin will easily break during processing, and a film that is too thick will have difficulty increasing the speed during hot lamination. The film may be attached to both sides of the OPS sheet, but if contact with oil is limited to one side, it can also be attached to only one side.
ゴム強化ポリスチレン二軸延伸フイルムにあら
かじめ種々な印刷を施したものを張り合わせて美
観を高めることもできる。 It is also possible to enhance the aesthetic appearance by laminating a rubber-reinforced polystyrene biaxially stretched film with various printings applied in advance.
以下、実施例により説明する。 Examples will be explained below.
実施例 １
30％のポリブタジエン成分を含むスチレンブタ
ジエンブロツク共重合体15％と、10％のポリブタ
ジエン成分を含むグラフト型のハイインパクトポ
リスチレンを５％と、ポリスチレン80％との混合
物からなる厚み30μのゴム強化ポリスチレン二軸
延伸フイルムを、厚み150μのOPSシートの両面
に熱ロールによる熱ラミ法によつて張り合わせて
透明な厚み210μのシートをつくつた。ゴム強化
ポリスチレン二軸延伸フイルムのポリブタジエン
由来の成分含有量は、「合計5.0％」である。この
シートを直径30mmの円筒上に巻きつけて、その表
面に、３回使用ずみの食用天プら油をうすく塗布
して放置した。比較のため150μのOPSシートを
同様の円筒上に巻きつけて同様に油を塗布して放
置した。OPSシートは、およそ１時間後から多
数のクラツクを発生しはじめたが、ゴム強化ポリ
スチレン二軸延伸フイルムを張りつけたシート
は、２ケ月経過後もクラツクの発生はなかつた。Example 1 Rubber with a thickness of 30μ made of a mixture of 15% styrene-butadiene block copolymer containing 30% polybutadiene component, 5% grafted high-impact polystyrene containing 10% polybutadiene component, and 80% polystyrene. A reinforced polystyrene biaxially stretched film was pasted onto both sides of a 150μ thick OPS sheet by hot lamination using hot rolls to create a transparent sheet with a thickness of 210μ. The content of components derived from polybutadiene in the rubber-reinforced polystyrene biaxially stretched film is "5.0% in total." This sheet was wrapped around a cylinder with a diameter of 30 mm, and the surface was lightly coated with edible tempura oil that had been used three times and left to stand. For comparison, a 150μ OPS sheet was wrapped around a similar cylinder, coated with oil in the same manner, and left to stand. The OPS sheet began to develop many cracks after about one hour, but the sheet to which the rubber-reinforced polystyrene biaxially stretched film was attached did not develop any cracks even after two months had passed.
このシート成形材料は、成形して、食用油を多
く含む食品の包装容器とするのに有用である。 This sheet molding material is useful for being molded into packaging containers for foods rich in edible oil.
比較例 １
実施例１において、ブロツク共重合体を13％と
し、これとポリスチレン87％との混合物でポリブ
タジエン由来の成分含有量を3.9％、として実施
例１の操作をくり返した。シートは３ケ月に僅か
ではあるがクラツクが発生した。Comparative Example 1 The procedure of Example 1 was repeated with the block copolymer at 13% and a mixture of this and 87% polystyrene with a polybutadiene-derived component content of 3.9%. The seat had a slight crack after 3 months.
比較例 ２
10％のポリブタジエン成分を含むグラフト型の
ハイインパクトポリスチレンを20％と、30％のポ
リブタジエン成分を含むスチレンブタジエンブロ
ツク共重合体を４％と、ポリスチレン76％との混
合物でポリブタジエン由来の成分を3.2％として
実施例１の操作をくり返した。12時間後、僅かで
はあるがクラツクの発生が認められた。Comparative Example 2 A mixture of 20% graft-type high-impact polystyrene containing 10% polybutadiene component, 4% styrene-butadiene block copolymer containing 30% polybutadiene component, and 76% polystyrene, which is a component derived from polybutadiene. The operation of Example 1 was repeated with the amount of 3.2%. After 12 hours, cracks were observed, albeit slightly.
以上説明したように本発明のポリスチレンシー
ト成形材料は、食用油によるストレスクラツクが
発生し難く、然もOPSシート本来の性質である
熱成形容易で剛性が高く透明で美しく、安価であ
るなどの有用な性質を保持しているので、油分の
多い食品の包装容器などとして用い得る有用な成
形材料である。 As explained above, the polystyrene sheet molding material of the present invention is resistant to stress cracks caused by cooking oil, and also has the inherent properties of OPS sheet, such as easy thermoforming, high rigidity, transparency, beauty, and low cost. Since it retains useful properties, it is a useful molding material that can be used as packaging containers for foods with a high oil content.
比較例 ３
60％のポリブタジエン成分を含むスチレンブタ
ジエンブロツク共重合体70％と、10％のポリブタ
ジエン成分を含むグラフト型のハイインパクトポ
リスチレン10％と、ポリスチレン20％との混合物
によつてポリブタジエン由来の成分含有量を42％
として実施例１の操作をくり返した。シートは、
ブロツキングが大きく、OPSシートとの貼り合
せ加工性が悪く実用性に劣るものであつた。Comparative Example 3 A component derived from polybutadiene was created by a mixture of 70% styrene-butadiene block copolymer containing 60% polybutadiene component, 10% grafted high-impact polystyrene containing 10% polybutadiene component, and 20% polystyrene. content 42%
The operation of Example 1 was repeated as follows. The sheet is
Blocking was large, lamination workability with the OPS sheet was poor, and the practicality was poor.
Claims (1)
らなるゴム成分とポリブタジエン又は、スチレン
ブタジエンゴムにスチレンをグラフトさせた共重
合体を含有し、該ゴム中にポリブタジエン由来の
成分含有量が合計3.5から40％含まれるゴム強化
ポリスチレンよりなる二軸延伸フイルムを表面に
貼り合わせた透明な二軸延伸ポリスチレンシート
成形材料。1 Contains a rubber component consisting of a block copolymer of styrene and butadiene and polybutadiene or a copolymer obtained by grafting styrene to styrene-butadiene rubber, and the rubber contains a total content of 3.5 to 40% of components derived from polybutadiene. A transparent biaxially oriented polystyrene sheet molding material with a biaxially oriented film made of rubber-reinforced polystyrene bonded to the surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14052083A JPS6032658A (en) | 1983-08-02 | 1983-08-02 | Polystyrene sheet molding material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14052083A JPS6032658A (en) | 1983-08-02 | 1983-08-02 | Polystyrene sheet molding material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6032658A JPS6032658A (en) | 1985-02-19 |
| JPH0424222B2 true JPH0424222B2 (en) | 1992-04-24 |
Family
ID=15270565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14052083A Granted JPS6032658A (en) | 1983-08-02 | 1983-08-02 | Polystyrene sheet molding material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6032658A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2570297B2 (en) * | 1986-06-23 | 1997-01-08 | 大日本インキ化学工業株式会社 | Biaxially stretched composite styrene resin sheet |
| JP2564257B2 (en) * | 1990-01-31 | 1996-12-18 | 出光石油化学株式会社 | Styrene resin sheet |
| JPH04215908A (en) * | 1990-11-30 | 1992-08-06 | Matsuyama Plow Mfg Co Ltd | Agricultural product packaging device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4884875A (en) * | 1972-02-15 | 1973-11-10 | ||
| JPS58129038A (en) * | 1982-01-27 | 1983-08-01 | Denki Kagaku Kogyo Kk | Transparent impact-resistant polystyrene film |
| JPS59182732A (en) * | 1983-04-01 | 1984-10-17 | 三菱化成ポリテック株式会社 | Biaxial stretched composite sheet |
-
1983
- 1983-08-02 JP JP14052083A patent/JPS6032658A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4884875A (en) * | 1972-02-15 | 1973-11-10 | ||
| JPS58129038A (en) * | 1982-01-27 | 1983-08-01 | Denki Kagaku Kogyo Kk | Transparent impact-resistant polystyrene film |
| JPS59182732A (en) * | 1983-04-01 | 1984-10-17 | 三菱化成ポリテック株式会社 | Biaxial stretched composite sheet |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6032658A (en) | 1985-02-19 |
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