JPH0798905B2 - Resin discoloration prevention method - Google Patents
Resin discoloration prevention methodInfo
- Publication number
- JPH0798905B2 JPH0798905B2 JP1238259A JP23825989A JPH0798905B2 JP H0798905 B2 JPH0798905 B2 JP H0798905B2 JP 1238259 A JP1238259 A JP 1238259A JP 23825989 A JP23825989 A JP 23825989A JP H0798905 B2 JPH0798905 B2 JP H0798905B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- cyclodextrin
- antioxidant
- discoloration
- added
- 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 - Fee Related
Links
Landscapes
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
【発明の詳細な説明】 〈産業上の利用分野〉 本発明は、熱可塑性樹脂を加熱、溶融して成形する際に
生じる樹脂の変色を防止する方法に関する。TECHNICAL FIELD The present invention relates to a method for preventing discoloration of a resin that occurs when a thermoplastic resin is heated and melted to be molded.
〈従来の技術〉 従来、例えばポリプロピレン樹脂などの熱可塑性樹脂を
フィルムに成形する場合、熱により樹脂が劣化（特に酸
化劣化）することを防ぐため、酸化防止剤を添加して成
形することが一般的であった。<Prior Art> Conventionally, when a thermoplastic resin such as polypropylene resin is formed into a film, it is generally formed by adding an antioxidant in order to prevent the resin from being deteriorated (especially by oxidative deterioration) due to heat. It was target.
〈発明が解決しようとする課題〉 上記酸化防止剤を添加すると確かに樹脂の酸化劣化は防
止できる。しかしながら、酸化防止剤を添加した場合、
その酸化防止剤自身の分解生成物等により、樹脂の変色
が著しくなるという問題があった。この変色は、例えば
成形物を包装用材料として用いる場合には外観上好まし
いものではなかった。<Problems to be Solved by the Invention> Addition of the above-mentioned antioxidant can certainly prevent oxidative deterioration of the resin. However, when an antioxidant is added,
There has been a problem that the discoloration of the resin becomes remarkable due to the decomposition products of the antioxidant itself. This discoloration is not preferable in appearance when the molded product is used as a packaging material.
そこで本発明は、酸化防止剤を添加した場合であって
も、加熱成形時の樹脂の変色を防止する方法を提供する
ものである。Therefore, the present invention provides a method of preventing discoloration of a resin during heat molding even when an antioxidant is added.
〈課題を解決するための手段〉 すなわち本発明は、酸化防止剤が0.02〜3wt％混合され
た熱可塑性樹脂を熱溶融させ成形するに際して、熱可塑
性樹脂にシクロデキストリンを添加することを特徴とす
る、樹脂変色防止方法である。<Means for Solving the Problems> That is, the present invention is characterized by adding cyclodextrin to the thermoplastic resin when the thermoplastic resin in which the antioxidant is mixed in 0.02 to 3 wt% is heat-melted and molded. , A resin discoloration prevention method.
〈作用〉 本発明は、シクロデキストリンを用いることにより、酸
化防止剤の分解される部分をシクロデキストリンが覆い
隠し、分解反応を抑制するため樹脂の成形の際の変色が
防止される。<Action> In the present invention, by using cyclodextrin, the portion of the antioxidant to be decomposed is covered with cyclodextrin and the decomposition reaction is suppressed, so that discoloration during molding of the resin is prevented.
〈実施例〉 本発明の対象となる熱可塑性樹脂は、ポリプロピレン、
ポリスチレン、ポリ塩化ビニル、ポリ塩化ビニリデン、
ポリ酢酸ビニル、ポリメタクリル酸エステル、ポリアク
リル酸エステルなどの酸化劣化を生じやすい、酸化防止
剤の添加を必要とする樹脂である。この熱可塑性樹脂に
添加される酸化防止剤としては、モノフェノール系、ビ
スフェノール系、高分子型フェノール系、イオウ系、リ
ン系などのものが知られており、トコフェロール（ビタ
ミンＥ）、ブチルヒドロキシトリオール（BHT）、テト
ラキス−〔メチレン−３−（3,5−ジ−第３−ブチル−
４−ヒドロキシフェニル）プロピオネート〕メタン（商
品名イルガノックス、日本チバガイギー社製）などが例
示できる。この酸化防止剤の一般的な添加量は、0.02〜
3wt％程度である。<Example> The thermoplastic resin targeted by the present invention is polypropylene,
Polystyrene, polyvinyl chloride, polyvinylidene chloride,
It is a resin such as polyvinyl acetate, polymethacrylic acid ester, polyacrylic acid ester, etc., which is prone to oxidative deterioration and requires addition of an antioxidant. As antioxidants added to this thermoplastic resin, monophenol type, bisphenol type, polymer type phenol type, sulfur type, phosphorus type and the like are known, and tocopherol (vitamin E), butylhydroxytriol. (BHT), tetrakis- [methylene-3- (3,5-di-tert-butyl-
4-Hydroxyphenyl) propionate] methane (trade name Irganox, manufactured by Nippon Ciba Geigy) and the like can be exemplified. The general addition amount of this antioxidant is 0.02 ~
It is about 3 wt%.
本発明は、上述の熱可塑性樹脂に、シクロデキストリン
を添加するものである。このシクロデキストリンは食品
衛生上安全であるので、成形物を食品包装材料として使
用する場合であっても問題がない。The present invention is to add cyclodextrin to the above-mentioned thermoplastic resin. Since this cyclodextrin is safe for food hygiene, there is no problem even when the molded product is used as a food packaging material.
シクロデキストリンの添加量は、0.1〜1.0wt％とするこ
とが好ましい。0.1wt％より少ないと目的とする効果が
得られず、1.0wt％を越えて添加した場合には樹脂との
相溶性が悪く分離してしまう。The amount of cyclodextrin added is preferably 0.1 to 1.0 wt%. If it is less than 0.1 wt%, the desired effect cannot be obtained, and if it is added in excess of 1.0 wt%, the compatibility with the resin is poor and separation occurs.
次に、本発明の効果を確認するため、ポリプロピレン樹
脂に酸化防止剤、シクロデキストリン、および両者をそ
れぞれ所定量添加し、Ｔダイにて押し出してフィルムを
成形し、酸化度および黄変度を測定した。押し出し温度
は210℃であった。結果を下表に示す。なお、酸化度は
樹脂を押し出した際の融解粘度速度（MFR）で確認し、
黄変度は分光光度計（ハンター社製）を用い、対照区
（ポリプロピレンのみ一回押出、添加剤無添加）を１と
して示した。Next, in order to confirm the effects of the present invention, an antioxidant, cyclodextrin, and both are added in a predetermined amount to polypropylene resin and extruded with a T die to form a film, and the degree of oxidation and yellowing are measured. did. The extrusion temperature was 210 ° C. The results are shown in the table below. The degree of oxidation is confirmed by the melt viscosity rate (MFR) when the resin is extruded,
The degree of yellowing was measured by using a spectrophotometer (manufactured by Hunter Co.) and indicated as 1 in the control group (only polypropylene was extruded once and no additive was added).
以上の結果から、シクロデキストリンを添加したものは
無添加のものに比べて黄変度が小さく、変色が抑制され
ていることがわかる。 From the above results, it can be seen that the one to which cyclodextrin was added had a smaller degree of yellowing and the discoloration was suppressed as compared with the one to which cyclodextrin was not added.
〈発明の効果〉 本発明は以上述べたように、シクロデキストリンを添加
したので、樹脂の加熱による変色を抑制することができ
る。従って、得られた成形物は外観上美麗であり、食品
包装材料として用いても何ら問題がない。また、使用す
るシクロデキストリンは食品衛生上も安全であり、食品
包装材料として用いるのに好適である。さらに、得られ
た成形物は、繰り返しの熱可塑性樹脂履歴によっても黄
変が防がれるので、例えばレトルト殺菌やボイル殺菌な
どに適用するのにも都合がよいなど、本発明の利用価値
は多大である。<Effects of the Invention> As described above, in the present invention, since cyclodextrin is added, discoloration due to heating of the resin can be suppressed. Therefore, the obtained molded product has a beautiful appearance and there is no problem even if it is used as a food packaging material. The cyclodextrin used is also safe in terms of food hygiene and is suitable for use as a food packaging material. Furthermore, since the obtained molded product can prevent yellowing due to repeated thermoplastic resin history, it is convenient for application to, for example, retort sterilization or boil sterilization, and the utility value of the present invention is great. Is.
Claims (2)
塑性樹脂を熱溶融させ成形するに際して、熱可塑性樹脂
にシクロデキストリンを添加することにより、酸化防止
剤の分解を抑制することによって変色を防止することを
特徴とする、樹脂変色防止方法。1. Discoloration by suppressing decomposition of an antioxidant by adding cyclodextrin to the thermoplastic resin when a thermoplastic resin containing 0.02 to 3 wt% of an antioxidant is hot melted and molded. A method for preventing resin discoloration, which comprises:
％であることを特徴とする、請求項１記載の樹脂変色防
止方法。2. The amount of cyclodextrin added is 0.1 to 1.0 wt.
%, The method for preventing resin discoloration according to claim 1, wherein
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1238259A JPH0798905B2 (en) | 1989-09-13 | 1989-09-13 | Resin discoloration prevention method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1238259A JPH0798905B2 (en) | 1989-09-13 | 1989-09-13 | Resin discoloration prevention method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03100065A JPH03100065A (en) | 1991-04-25 |
| JPH0798905B2 true JPH0798905B2 (en) | 1995-10-25 |
Family
ID=17027524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1238259A Expired - Fee Related JPH0798905B2 (en) | 1989-09-13 | 1989-09-13 | Resin discoloration prevention method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0798905B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5492947A (en) * | 1994-06-23 | 1996-02-20 | Aspen Research Corporation | Barrier material comprising a thermoplastic and a compatible cyclodextrin derivative |
| US5776842A (en) * | 1994-06-23 | 1998-07-07 | Cellresin Technologies, Llc | Cellulosic web with a contaminant barrier or trap |
| FR2732026B1 (en) * | 1995-03-21 | 1997-06-06 | Roquette Freres | PROCESS FOR IMPROVING RECIPROCAL COMPATIBILITY OF POLYMERS |
| US5882565A (en) * | 1995-12-11 | 1999-03-16 | Cellresin Technologies, Llc | Barrier material comprising a thermoplastic and a compatible cyclodextrin derivative |
| US6851462B2 (en) | 2001-10-30 | 2005-02-08 | The Goodyear Tire & Rubber Company | Rubber compositions containing a cyclodextrin compound |
| US7166671B2 (en) * | 2002-12-10 | 2007-01-23 | Cellresin Technologies, Llc | Grafted cyclodextrin |
| JP4763305B2 (en) * | 2005-02-15 | 2011-08-31 | 東北リコー株式会社 | Thermoplastic resin molding |
| JP5077846B2 (en) * | 2007-03-28 | 2012-11-21 | 国立大学法人東京農工大学 | Synthetic resin composition |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63218063A (en) * | 1986-09-24 | 1988-09-12 | 株式会社近久 | Packaging material |
-
1989
- 1989-09-13 JP JP1238259A patent/JPH0798905B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03100065A (en) | 1991-04-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |