JP4190128B2 - UV-absorbing polymer composition - Google Patents
UV-absorbing polymer composition Download PDFInfo
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- JP4190128B2 JP4190128B2 JP2000060998A JP2000060998A JP4190128B2 JP 4190128 B2 JP4190128 B2 JP 4190128B2 JP 2000060998 A JP2000060998 A JP 2000060998A JP 2000060998 A JP2000060998 A JP 2000060998A JP 4190128 B2 JP4190128 B2 JP 4190128B2
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- polymer composition
- oryzanol
- polyethylene terephthalate
- weight
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- 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.)
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- Manufacture Of Macromolecular Shaped Articles (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は紫外線を吸収し、内容物を紫外線から保護することができる食品等の包装容器等の製造に適した紫外線吸収性ポリマー組成物に関する。
【０００２】
【従来の技術】
食品等を包装するプラスチック容器は、内容物を保護するために外部からの紫外線をカットすることが必要である。そのために、従来からベンゾフェノン系、ベンゾトリアゾール系、サリシレート系、シアノアクリレート系やニッケル錯塩等の有機系の紫外線吸収剤がプラスチックに添加されている。
しかしながら、これらの紫外線吸収剤は、プラスチックとの相溶性が悪いものが多く、プラスチック製容器等の表面へブルームし易いことから、最近の安全性指向の動きのなかで食品包装用や医薬品包装用に使用するには問題がある。
又、微粒子酸化チタンや微粒子酸化亜鉛の様な金属酸化物も紫外線を吸収することができるが、これらの使用では透明な容器や無色の容器を得ることはできない。
【０００３】
【発明が解決しようとする課題】
従って、本発明の目的はブルームしても食品衛生上安全であり、且つ透明なポリマー製容器やフィルム等の製造が可能な紫外線吸収性に優れたポリマー組成物を提供することである。
本発明者は、上記目的を達成すべく検討した結果、充分な耐熱性を有する天然物質で食品添加物リストに記載されているγ−オリザノールを使用することによって、紫外線を吸収して内容物を保護できるポリマー成形物が得られること、更には、その耐候性も向上することを見いだし、本発明を完成するに至った。
【０００４】
【課題を解決するための手段】
上記の目的は、以下の本発明によって達成される。即ち、本発明は、ポリエチレンテレフタレート樹脂に、該樹脂１００重量部当たり０．０２〜３重量部のγ−オリザノールが、ポリエチレンテレフタレート樹脂が溶融する温度で混合して配合されてなることを特徴とする紫外線吸収性ポリエチレンテレフタレートポリマー組成物及び上記組成物を成形してなることを特徴とする食品用包装材である。
【０００５】
【発明の実施の形態】
次に発明の実施の形態を挙げて本発明を更に詳細に説明する。
本発明で使用するポリマーはポリエチレンテレフタレートポリマーである。
【０００６】
本発明で使用するγ−オリザノールは、米油、胚芽油や米ぬか等の植物由来の物質であり、トリペンテルアルコールや各種植物ステロールのフェルラ酸エステルの総称である。γ−オリザノールとしては、築野食品工業株式会社やオリザ油化株式会社等の市販品が使用できる。
γ−オリザノールのポリマーへの配合量は、ポリマー１００重量部に対して０．０２〜３重量部の割合である。少な過ぎると紫外線吸収が不十分となり、多過ぎると紫外線吸収性は飽和状態となり不経済である。
【０００７】
本発明のポリマー組成物は、ポリエチレンテレフタレートと加熱溶融状態でγ−オリザノールとを混合して製造される。例えば、ポリエチレンテレフタレートとγ−オリザノールとをヘンシェルミキサー等で混合し、得られた混合物を２軸押出機等により混練し、ペレット状に加工される。その際、必要により、顔料、安定剤、充填剤等の公知の添加剤を適宜添加することができる。
【０００８】
かくして得られる本発明のポリマー組成物は、使用目的に従って、フィルム、シート、パイプ、繊維、その他の成形物に射出成形、ブロー成形、押出成形や圧縮成形等の通常のプラスチックの成形方法を用いて成形される。
本発明のポリマー組成物を用いた成形物は、紫外線吸収性（紫外線遮断性）とともに耐候性にも優れているので、食品用の各種包装材（フィルム、袋、容器等）に好適である。
【０００９】
【実施例】
次に実施例及び比較例を挙げて本発明を具体的に説明する。
【００１０】
実施例１
ＰＥＴ（ポリエチレンテレフタレート：ユニチカ社製ＭＡ１３４４）９５重量部にγ−オリザノール（築野食品工業社製γ−オリザノール、純度９９．９重量％）５．０部を配合し、容器中で簡単に混合してから４５ｍｍ二軸押出機にて混練し、ペレット化した。
得られたペレット状の組成物とＰＥＴ樹脂を４：１００の重量比率で混合し、Ｔダイ押出機にて厚み０．５ｍｍの透明シートを作製した。
得られた透明シートの光透過率を分光光度計で測定した。結果を図１に示す。
【００１１】
比較例１
実施例１のＰＥＴ樹脂だけを使用して実施例１と同様にＴダイ押出機にて厚み０．５ｍｍのシートを作製し、この光透過率を分光光度計で測定した。結果を図２に示す。
【００１２】
又、実施例１と比較例１のＰＥＴシートの耐候性をサンシャインウェザオーメーターで評価した。５００時間照射後のエローインデックスの差で比較した結果を表１に示す。
表 １
以上のように、プラスチックシート中のγ−オリザノールによって特に波長が約３２０〜３７０ｎｍの紫外線の吸収に顕著な効果が得られるとともに耐候性向上効果も得られることが確認された。
【００１４】
以上の本発明によれば、紫外線吸収性及び耐候性に優れた透明な成形物の製造が可能なポリマー組成物が提供される。
本発明のポリマー組成物は、安全性にも優れていることから、特に、食品用の包装材の製造に好適である。
【図面の簡単な説明】
【図１】 実施例１のＰＥＴシートの光透過率の測定結果である。
【図２】 比較例１のＰＥＴシートの光透過率の測定結果である。[0001]
BACKGROUND OF THE INVENTION
The present invention absorbs ultraviolet light, the contents regarding ultraviolet absorbing polymer compositions suitable for the production of such packaging containers food be rinsed can be protected from ultraviolet rays.
[0002]
[Prior art]
A plastic container for packaging food or the like needs to cut ultraviolet rays from the outside in order to protect the contents. For this purpose, organic ultraviolet absorbers such as benzophenone, benzotriazole, salicylate, cyanoacrylate and nickel complex salts have been added to plastics.
However, many of these UV absorbers have poor compatibility with plastics, and since they tend to bloom to the surface of plastic containers, etc., they are used for food packaging and pharmaceutical packaging in recent safety-oriented movements. There is a problem to use.
Further, metal oxides such as fine particle titanium oxide and fine particle zinc oxide can also absorb ultraviolet rays. However, when they are used, a transparent container or a colorless container cannot be obtained.
[0003]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to provide a polymer composition that is safe for food hygiene even when blooming, and that is capable of producing transparent polymer containers, films, and the like, and that is excellent in ultraviolet absorption.
As a result of studying to achieve the above-mentioned object, the present inventor has absorbed natural ultraviolet rays by using γ-oryzanol, which is a natural substance having sufficient heat resistance and described in the food additive list. It was found that a polymer molded product that can be protected was obtained, and that the weather resistance was also improved, and the present invention was completed.
[0004]
[Means for Solving the Problems]
The above object is achieved by the present invention described below. That is, the present invention is characterized in that 0.02 to 3 parts by weight of γ-oryzanol per 100 parts by weight of the resin is mixed and blended with the polyethylene terephthalate resin at a temperature at which the polyethylene terephthalate resin melts. A UV-absorbing polyethylene terephthalate polymer composition and a food packaging material obtained by molding the composition.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, the present invention will be described in more detail with reference to embodiments of the invention.
Polymer used in the present invention is Ru polyethylene terephthalate polymer der.
[0006]
Γ-Oryzanol used in the present invention is a plant-derived substance such as rice oil, germ oil or rice bran, and is a general term for ferulic acid esters of tripental alcohol and various plant sterols. As γ-oryzanol, commercially available products such as Tsukino Food Industry Co., Ltd. and Oriza Oil Co., Ltd. can be used.
The amount of the γ- oryzanol polymer is the ratio of 0.02-3 parts by weight per 100 parts by weight of the polymer. If the amount is too small, the ultraviolet absorption becomes insufficient, and if it is too large, the ultraviolet absorption becomes saturated, which is uneconomical.
[0007]
The polymeric compositions of the present invention, Ru is prepared by mixing and γ- oryzanol in a heated molten state of polyethylene terephthalate. For example, polyethylene terephthalate and γ-oryzanol are mixed with a Henschel mixer or the like, and the resulting mixture is kneaded with a twin screw extruder or the like and processed into a pellet form. At that time, known additives such as pigments, stabilizers, fillers and the like can be appropriately added as necessary .
[0008]
Thus the polymer composition of the present invention obtained in accordance with the intended use, films, sheets, pipes, fibers, injection molding and other molding, blow molding, a molding method for conventional plastic extrusion or compression molding using To be molded.
A molded article using the polymer composition of the present invention is suitable for various food packaging materials (films, bags, containers, etc.) because it is excellent in ultraviolet absorption (ultraviolet ray shielding) and weather resistance.
[0009]
【Example】
Next, the present invention will be specifically described with reference to examples and comparative examples.
[0010]
Example 1
95 parts by weight of PET (polyethylene terephthalate: MA1344 manufactured by Unitika) is mixed with 5.0 parts of γ-oryzanol (γ-oryzanol manufactured by Tsukuno Food Industry Co., Ltd., purity 99.9% by weight) and mixed in a container. After that, the mixture was kneaded with a 45 mm twin screw extruder and pelletized.
The obtained pellet-shaped composition and PET resin were mixed at a weight ratio of 4: 100, and a transparent sheet having a thickness of 0.5 mm was prepared using a T-die extruder.
The light transmittance of the obtained transparent sheet was measured with a spectrophotometer. The results are shown in FIG.
[0011]
Comparative Example 1
Using only the PET resin of Example 1, a sheet having a thickness of 0.5 mm was prepared with a T-die extruder in the same manner as in Example 1, and the light transmittance was measured with a spectrophotometer. The results are shown in FIG.
[0012]
The weather resistance of the PET sheets of Example 1 and Comparative Example 1 was evaluated with a sunshine weatherometer. Table 1 shows the result of comparison by the difference in the yellow index after irradiation for 500 hours.
Table 1
As described above, it was confirmed that γ-oryzanol in the plastic sheet has a remarkable effect on absorption of ultraviolet rays having a wavelength of about 320 to 370 nm, and also has an effect of improving weather resistance.
[0014]
According to the present invention described above, a polymer composition capable of producing a transparent molded article excellent in ultraviolet absorption and weather resistance is provided.
The polymeric compositions of the present invention, since it is excellent in safety, in particular, is suitable for the manufacture of packaging materials for food.
[Brief description of the drawings]
1 is a measurement result of light transmittance of a PET sheet of Example 1. FIG.
2 is a measurement result of light transmittance of a PET sheet of Comparative Example 1. FIG.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000060998A JP4190128B2 (en) | 2000-03-06 | 2000-03-06 | UV-absorbing polymer composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000060998A JP4190128B2 (en) | 2000-03-06 | 2000-03-06 | UV-absorbing polymer composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001247773A JP2001247773A (en) | 2001-09-11 |
| JP4190128B2 true JP4190128B2 (en) | 2008-12-03 |
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ID=18581220
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000060998A Expired - Fee Related JP4190128B2 (en) | 2000-03-06 | 2000-03-06 | UV-absorbing polymer composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4190128B2 (en) |
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2000
- 2000-03-06 JP JP2000060998A patent/JP4190128B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| JP2001247773A (en) | 2001-09-11 |
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