JP4133143B2 - Thermoplastic resin composition for forming light-shielding container and container using the same - Google Patents
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Description
【０００１】
【発明の属する技術分野】
本発明は、食品や医薬品等の容器として用いる場合に遮光性、安全性等に優れた効果を発揮する遮光性容器成形用熱可塑性樹脂組成物、及び該熱可塑性樹脂組成物を用いて成形し得られる容器に関するものである。
【０００２】
【従来の技術】
従来より食品、薬品等は、空気、紫外線、可視光線に触れると変質するものが多いため、これを解決するために熱可塑性樹脂フイルムを複数積層したり、樹脂フイルム（シ−ト）にアルミニウム箔を圧着したり、アルミニウムを蒸着して、紫外線及び可視光線の遮光性に優れた容器の開発が検討されている。
特に、樹脂フイルムやシ−トにアルミニウム箔を圧着したり、アルミニウムを蒸着した熱可塑性樹脂製容器は、遮光性に優れていることから食品や薬品の長期保存性にも優れた熱可塑性樹脂製容器として盛んに使用されている。
【０００３】
しかし、該熱可塑性樹脂製容器は、充填した内容物の電子レンジによる加熱が不可能である。更に、該熱可塑性樹脂製容器の使用後の処分では、アルミニウムと熱可塑性熱可塑性樹脂の分離回収が不可能であり、リサイクルを行わず焼却による処分が行われているが、アルミニウム金属が含まれていることによって焼却の際に高温となり焼却炉を傷める等の問題点がある。
また、カ−ボンブラック配合熱可塑性樹脂使用成形品は、遮光性に優れており使用後のリサイクルも可能である。
【０００４】
このため、アルミニウムに代えた熱可塑性樹脂製容器としてカ−ボンブラックの使用も検討されているが、熱可塑性樹脂との混練の際に大気中への飛散がひどく作業環境の低下の要因となるばかりでなく、カ−ボンブラックには安全性が懸念されている微量の多環式芳香族炭化水素が含有されており、食品用熱可塑性樹脂製容器として使用することは好ましくない。
【０００５】
なお、各種の顔料を複数混合することによって、黒色系混合顔料が得られることは以前より知られているが、これらを単に複数混合した顔料を使用して黒味を帯びたフイルムを用いた熱可塑性樹脂容器では、カ−ボンブラックと同様な遮光性に優れた効果を発揮する成形品は、いまだ製造されてない。
【０００６】
【発明が解決しようとする課題】
そこで本発明者等は、カ−ボンブラックを使用せずに熱可塑性樹脂と混練した際に優れた遮光性を発揮し、しかも分散性に富んだ黒色系混合顔料を開発して、更に、これを用い遮光性良好な容器の製造を検討したのである。
【０００７】
【課題を解決するための手段】
即ち、請求項１は、熱可塑性樹脂１００重量部に、平均粒径０．１０〜０．４０μｍの黄色酸化鉄、弁柄及び複合酸化鉄から選択される一種又は二種以上の茶色系無機顔料０．７５〜６５重量部、及び青色系有機顔料０．３０〜４０重量部を混合して得られる黒色系混合顔料を、配合してなる遮光性容器成形用熱可塑性樹脂組成物を開発したのである。
【０００８】
請求項１使用の黒色系混合顔料は、平均粒径０．１０〜０．４０μｍの茶色系無機顔料０．７５〜６５重量部（以後部と略）及び青色系有機顔料０．３〜４０部を組合わせて得られるものである。
本発明の茶色系無機顔料は、平均粒径が０．１０〜０．４０μｍのものを使用したときに優れた遮光性が発揮される。０．１０μｍより小さいと隠蔽性が低下して好ましくない。また、０．４０μｍより大きい場合にも熱可塑性樹脂との混練の際に隠蔽性が低下するために、これを用いて得られる遮光性容器成形用熱可塑性樹脂組成物の遮光性効果が低下して好ましくない。
【０００９】
茶色系無機顔料の使用量は、熱可塑性樹脂１００部に対し０．７５〜６５部を使用する、この際に０．７５部より少ないと遮光性が低下し好ましくない、また６５部より多いと成形品の製膜性が困難となり好ましくない。
青色系有機顔料の使用量は、熱可塑性樹脂１００部に対し０．３〜４０部を使用する、この際に０．３部より少ないと遮光性が低下し好ましくない、また４０部より多いと成形品の製膜性が困難となり好ましくない。
【００１０】
本発明の茶色系無機顔料は、黄色酸化鉄、弁柄、複合酸化鉄が挙げられる。
本発明で使用する青色系有機顔料としては、汎用の有機顔料であれば良く、例えば、銅フタロシアニンブルー、アンスラキノン系ブルー、異種金属フタロシアニンブルー等が挙げられる。
【００１１】
茶色系無機顔料として、請求項１記載の黄色酸化鉄、弁柄及び複合酸化鉄から選択される一種又は二種以上の茶色系無機顔料に限定した場合、得られる黒色系混合顔料の遮光性が著しく改良された、本発明の遮光性容器成形用熱可塑性樹脂組成物が得られるので好ましい。
この際に、０．１０〜０．４０μｍに限定された粒度分布を持つ黄色酸化鉄、弁柄及び／又は複合酸化鉄の茶色系無機顔料を含有の黒色系混合顔料を使用することで優れた遮光性効果が発揮されている。
【００１２】
請求項２は、茶色系無機顔料と青色系有機顔料の配合割合を１０：４〜１０：６とすることで遮光性に優れた最適な黒色系混合顔料が得られる。
該黒色系混合顔料を熱可塑性樹脂に配合した組成物を用いた成形品は、黒味は程々であるが、遮光性はカーボンブラックと変わらない優れた遮光性を発揮するものである。
該配合割合に於いて、茶色系無機顔料１０に対して、青色系有機顔料が４より少ないと紫外線の遮蔽効果が低下し好ましくない、また、６より多い場合には可視光線の遮蔽効果が低下して、請求項２に記載の優れた効果は得られず好ましくない。
【００１３】
請求項３は、熱可塑性樹脂１００部に、平均粒径０．１０〜０．４０μｍの茶色系無機顔料０．７５〜６５部、青色系有機顔料０．３０〜４０部、及び平均粒径０．０５〜０．４０μｍ酸化チタン０．１〜６５部を混合して得られる黒色系混合顔料を配合し得られる遮光性容器成形用熱可塑性樹脂組成物である。請求項３の遮光性容器成形用熱可塑性樹脂組成物は、請求項１記載の黒色系混合顔料に平均粒径０．０５〜０．４０μｍの酸化チタンを配合することで、請求項１又は請求項２の方法よりも優れた遮光性効果が得られるものである。
【００１４】
本発明で使用する酸化チタンとしては、平均粒径が０．０５〜０．４０μｍのものを使用すると隠蔽性の向上のみならず、請求項１又は請求項２での茶色系無機顔料及び青色系有機顔料の使用量が減少されるので好ましい。
平均粒径が０．０５μｍ以下であると可視光線の遮蔽効果が低下して好ましくない、また平均粒径が０．４０μｍ以上であると透明性となり隠蔽性が低下して好ましくない。
酸化チタンの使用量は、熱可塑性樹脂１００部に対して０．１〜６５部を使用する、この際に０．１部より少ないと可視光線遮蔽が十分に発揮されない、また酸化チタンを配合した場合の特徴である隠蔽性が十分に発揮されない、また６５部より多いと熱可塑性樹脂使用製品の成形性が低下して好ましくない。
【００１５】
尚、請求項３での茶色系無機顔料及び青色系有機顔料の使用量は、請求項１に準じて使用すれば良い。
特に、請求項３での酸化チタンの使用は、黒色を視覚的にソフトにする場合や可視部の遮蔽効果を補充するときに平均粒径０．１０〜０．４０μｍのものを使用すると良い。
このため、請求項３での効果は、酸化チタンを配合しない請求項１又は請求項２記載の方法では満足する遮光性が得られない肉厚の薄い容器や包装品を製造する場合にも、優れた遮光性効果が得られるのである。
【００１６】
請求項４は、請求項１〜３のいずれかに記載の遮光性容器成形用熱可塑性樹脂組成物を用いて成形し得られる容器である。
該容器は、本発明の遮光性容器成形用熱可塑性樹脂組成物のみからなるフイルムの単層でも、他の樹脂フイルムを複数積層し成形した容器でも良い。これら積層品は、目的に応じて層を増やし、その一層に本発明品使用のフイルムを積層することで遮光性に富んだ容器が容易に得られる。
該容器は可視光線や紫外線等によって変質し易い、食品や医療品等の包装に最適な容器が得られる。例えば、食品類では容器内への太陽光の遮蔽によって、牛乳、ヨーグルト、食用油、スナック菓子等の保存性に優れた効果を発揮する。
【００１７】
尚、本発明容器の製造には、従来より汎用されている通常方法で成形すれば良く、例えば、積層容器では本発明の遮光性容器成形用熱可塑性樹脂組成物使用のフイルムを中間層に、外表層に印刷可能フイルム層を、また最内層に酸化チタン配合樹脂フイルム層からなる三層積層容器等各種の積層容器が挙げられる。
【００１８】
また、本発明の遮光性容器成形用熱可塑性樹脂組成物シ−ト単層からなる、例えばブロ−成形品が挙げられる。
本発明で使用の熱可塑性樹脂としては、ポリエチレン、ポリプロピレン、エチレン−プロピレン共重合体等のポリオレフィン系樹脂、ポリスチレン、ポリエチレンテレフタレ−ト、ポリアミド等が使用可能であり、また、これらの混合物でも良い。
そして、本発明の遮光性容器成形用熱可塑性樹脂組成物は、それを用い得られる容器の形態及び用途に基づき、使用する樹脂を決定すれば良い。
【００１９】
この際に使用する成形機についても、ブロ−成形機、Ｔダイ成形機、インジェクション成形機、インフレ−ション成形機等各種成形機を、用途に従って使用すれば良い。
本発明の遮光性容器成形用熱可塑性樹脂組成物及びそれを用いた成形品の製造は、従来より採用されている方法、混合機、押出機、ブロ−成形機等を用い製造可能である。
尚、本発明の遮光性容器成形用熱可塑性樹脂組成物は、その性質を損なわない範囲で各種の添加剤、例えば酸化防止剤、顔料、帯電防止剤、滑剤等を任意に配合しても良い。
【００２０】
以下に実施例及び比較例を記載する。尚、重量部は部と記載する。
実施例１
ＭＦＲが５．０、密度０．９３の低密度ポリエチレン１００部に対して、予め茶色系無機顔料として平均粒径０．１２μｍの複合酸化鉄（ＣＩピグメントブラウン３３）４部、及び青色系有機顔料として銅フタロシアニンブルー（ＣＩピグメント１５：１）２部に必要に応じて分散剤を配合した黒色系混合顔料を、混合装置を用い混合した後に、直径４０ｍｍ押出機を使用して１５０℃で混練して、本発明の遮光性容器成形用熱可塑性樹脂組成物を製造した。
【００２１】
上記の遮光性容器成形用熱可塑性樹脂組成物組成物をインフレ−ション成形機を使用して温度１５０℃で厚さ５０μｍの熱可塑性樹脂フイルムを製造した。
該熱可塑性樹脂フイルムを中間層に、外表面にナイロンフイルムを、また最内層に未着色熱可塑性樹脂フイルムを積層した三層からなる遮光フイルムを用い内容積５００ｍｌの容器を作成した。
次に実施例１〜４及び比較例１〜６について、▲１▼製膜性、▲２▼遮光性、及び▲３▼保存性（食品）について、以下に示す方法により測定して、その結果を表１に記載する。
【００２２】
▲１▼製膜性
インフレ−ション成形機を用い製造した５０μｍ樹脂フイルムに、製膜性について、目視により測定した。
○………通常方法により、容易に製膜する。
△………ときどきフイルム切れが発生する。
×………フイルム切れが屡々発生して成形困難。
【００２３】
▲２▼遮光性
上記▲１▼で使用の厚さ５０μｍ樹脂フイルムの遮光性について、比較用試料として実施例１使用の低密度ポリエチレンにカ−ボンブラックを１．５重量％配合した厚さ５０μｍフイルムを基準にし、目視により比較検討した。
○………基準と変わらぬ遮光性あり
△………基準より、遮光性が若干劣る
×………基準より、かなり遮光性が劣る
【００２４】
▲３▼保存性（食品）
上記▲１▼で使用の厚さ５０μｍの樹脂フイルムを中間層に、外表面にナイロンフイルムを、最内層に未着色熱可塑性樹脂フイルムを積層した三層からなる遮光フイルムを用い内容積５００ｍｌの容器を作成し。
これに油性スナック菓子を充填密閉して、太陽光線下で１日６時間を７日間放置後に、開封してスナック菓子の味覚について比較した。
尚、基準としては、中間フイルム層に▲１▼で使用の厚さ５０μｍ樹脂フイルムに代えてアルミニウム蒸着フイルムを用い、比較用５００ｍｌ容器を製造し比較検討した。
○………基準と、全く変わらない
△………基準に比較して、若干風味が低下する
×………基準に比較して、風味が変化している
【００２５】
【表１】
実施例２
ＭＦＲ５．０、密度０．９３の低密度ポリエチレン１００部に対して、予め茶色系無機顔料として平均粒径０．１２μｍの弁柄（ＣＩピグメントレッド１０１）４部、及び青色系有機顔料としアンスラキノン系ブルー（ＣＩピグメントブルー６０）２部を配合した黒色系混合顔料を混合装置を用い混合した後に、直径４０ｍｍ押出機を用い１５０℃で混練して、本発明の遮光性容器成形用熱可塑性樹脂組成物を製造した。
その後、該遮光性容器成形用熱可塑性樹脂組成物をインフレーション成形機を用いて、樹脂フイルムを製造した。
以後、実施例１と同様な方法により上記の樹脂フイルムを用い、三層よりなる遮光性容器を製造した。
【００２７】
実施例３
ＭＦＲが５．０、密度０．９３のポリエチレン１００部に対して、予め茶色系無機顔料として平均粒径０．１２μｍの黄色酸化鉄（ＣＩピグメントイエロー４２）４部、平均粒径０．１２μｍの酸化チタン４部及び青色系有機顔料として銅フタロシアニンブルー（ＣＩピグメント１５：１）２部必要に応じて分散剤を混合装置を用い混合した後に、直径４０ｍｍ押出機を用い１５０℃で混練して、本発明の遮光性容器成形用熱可塑性樹脂組成物を製造した。
以後、実施例１と同様操作によりインフレーション成形機を用い厚さ５０μｍの樹脂フイルムを製造し、測定用試料とする。
【００２８】
実施例４ 実施例３で使用のポリエチレンをＭＦＲ１０、密度０．９１のポリプロピレンにかえる以外は実施例３と同じである。尚、この際に使用する押出機温度及びインフレ−ション成形機温度は２００℃である。
【００２９】
比較例１ 実施例１の茶色系無機顔料使用量を０．６５部とする以外は、実施例１と同じである。
比較例２ 実施例１の茶色系無機顔料の使用量を７５部とする以外は、実施例１と同じである。
比較例３ 実施例１で使用の青色系有機顔料の使用量を０．２部とする以外は、実施例１と同じである。
【００３０】
比較例４ 実施例１で使用の青色系有機顔料の使用量を５０部とする以外は、実施例１と同じである。
比較例５ 実施例１で使用の茶色系無機顔料の平均粒径を０．０５μｍとする以外は、実施例１と同じである。
比較例６ 実施例１で使用の茶色系無機顔料の平均粒径を０．５５μｍとする以外は、実施例１と同じである。
【００３１】
【発明の効果】
本発明の遮光性容器成形用熱可塑性樹脂組成物は、カ−ボンブラック配合品と同等な遮光性に富んでいる。
即ち、本発明の遮光性容器成形用熱可塑性樹脂組成物は、太陽光線で酸化され易い物質、例えば不飽和な油類をスナック菓子類容器に使用した場合にも、内容物に変化を来たさない優れた効果を発揮するので、食品、医薬品等容器に最適な樹脂組成物を提供するのである。
また、使用する樹脂を熱可塑性樹脂のみ限定しており、従って容易にリサイクルが可能である。しかも、本発明の遮光性容器用熱可塑性樹脂組成物を使用の容器は、焼却処分を行った場合にも有害なガスを発生する心配は全くない。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a thermoplastic resin composition for molding a light-shielding container that exhibits an effect excellent in light-shielding property, safety, etc. when used as a container for foods, pharmaceuticals, and the like, and molding using the thermoplastic resin composition. It relates to the resulting container.
[0002]
[Prior art]
Conventionally, many foods, chemicals, and the like change in quality when exposed to air, ultraviolet rays, and visible light. To solve this problem, multiple thermoplastic resin films are laminated, or aluminum foil is applied to the resin film (sheet). Development of a container excellent in light-shielding property of ultraviolet rays and visible light by pressure bonding or vapor-depositing aluminum has been studied.
In particular, thermoplastic resin containers that are made by crimping aluminum foil on resin film or sheet or vapor-deposited aluminum are made of a thermoplastic resin that has excellent light-shielding properties and therefore excellent long-term storage stability for food and chemicals. It is actively used as a container.
[0003]
However, the thermoplastic resin container cannot heat the filled contents with a microwave oven. Furthermore, in the disposal after use of the thermoplastic resin container, it is impossible to separate and recover the aluminum and the thermoplastic thermoplastic resin, and the disposal by incineration is performed without recycling, but aluminum metal is included. Therefore, there is a problem that the incinerator is damaged due to high temperature during incineration.
In addition, the molded product using carbon black-containing thermoplastic resin is excellent in light shielding properties and can be recycled after use.
[0004]
For this reason, the use of carbon black as a thermoplastic resin container in place of aluminum is also being studied, but scattering into the atmosphere during kneading with a thermoplastic resin is a cause of a decrease in working environment. Not only that, carbon black contains a trace amount of polycyclic aromatic hydrocarbons, whose safety is a concern, and is not preferable for use as a food-made thermoplastic resin container.
[0005]
In addition, it has been known that black mixed pigments can be obtained by mixing a plurality of various pigments. However, a heat that uses a blackish film using a pigment obtained by simply mixing a plurality of these pigments. In the plastic resin container, a molded product that exhibits the same excellent light-shielding effect as that of carbon black has not been produced yet.
[0006]
[Problems to be solved by the invention]
Accordingly, the present inventors have developed a black mixed pigment that exhibits excellent light-shielding properties and is highly dispersible when kneaded with a thermoplastic resin without using carbon black. The production of a container with good light-shielding properties was studied.
[0007]
[Means for Solving the Problems]
That is, claim 1 is one or two or more kinds of brown inorganic pigments selected from yellow iron oxide having a mean particle size of 0.10 to 0.40 μm, petrol and composite iron oxide in 100 parts by weight of a thermoplastic resin. Because we developed a thermoplastic resin composition for molding light-shielding containers, which is made by blending 0.75 to 65 parts by weight and a black mixed pigment obtained by mixing 0.30 to 40 parts by weight of a blue organic pigment. is there.
[0008]
The black mixed pigment used in claim 1 is 0.75 to 65 parts by weight (hereinafter abbreviated as “part”) of a brown inorganic pigment having an average particle diameter of 0.10 to 0.40 μm and 0.3 to 40 parts of a blue organic pigment. It is obtained by combining.
The brown inorganic pigment of the present invention exhibits excellent light shielding properties when it has an average particle size of 0.10 to 0.40 μm. If it is smaller than 0.10 μm, the concealability is lowered, which is not preferable. Further, even when the thickness is larger than 0.40 μm, the concealing property is lowered during kneading with the thermoplastic resin, so that the light shielding effect of the light shielding container molding thermoplastic resin composition obtained by using this is lowered. It is not preferable.
[0009]
The amount of the brown inorganic pigment used is 0.75 to 65 parts with respect to 100 parts of the thermoplastic resin. In this case, if the amount is less than 0.75 parts, the light-shielding property is deteriorated, and more than 65 parts. The film forming property of the molded product becomes difficult, which is not preferable.
The amount of the blue organic pigment used is 0.3 to 40 parts with respect to 100 parts of the thermoplastic resin. In this case, if the amount is less than 0.3 part, the light-shielding property is deteriorated, and more than 40 parts. The film forming property of the molded product becomes difficult, which is not preferable.
[0010]
Examples of the brown inorganic pigment of the present invention include yellow iron oxide, dial, and composite iron oxide.
The blue organic pigment used in the present invention may be a general-purpose organic pigment, and examples thereof include copper phthalocyanine blue, anthraquinone blue, and different metal phthalocyanine blue.
[0011]
When the brown inorganic pigment is limited to one or two or more brown inorganic pigments selected from the yellow iron oxides, petals and composite iron oxides according to claim 1 , the black mixed pigment obtained has a light-shielding property. The thermoplastic resin composition for molding a light-shielding container of the present invention, which is remarkably improved, is preferable because it can be obtained.
In this case, it was excellent by using a black mixed pigment containing a brown inorganic pigment of yellow iron oxide having a particle size distribution limited to 0.10 to 0.40 μm, a petite and / or composite iron oxide. The light shielding effect is exhibited.
[0012]
According to the second aspect of the present invention, an optimum black mixed pigment having excellent light shielding properties can be obtained by setting the blending ratio of the brown inorganic pigment and the blue organic pigment to 10: 4 to 10: 6.
A molded product using a composition in which the black mixed pigment is blended with a thermoplastic resin has moderate blackness, but exhibits excellent light-shielding properties that are the same as carbon black.
In the blending ratio, when the amount of the blue organic pigment is less than 4 with respect to the brown inorganic pigment 10, the ultraviolet shielding effect is unfavorable, and when it is more than 6, the visible light shielding effect is lowered. Thus, the excellent effect described in claim 2 is not obtained, which is not preferable.
[0013]
In claim 3 , 100 parts of thermoplastic resin, 0.75 to 65 parts of brown inorganic pigment having an average particle diameter of 0.10 to 0.40 μm, 0.30 to 40 parts of blue organic pigment, and an average particle diameter of 0 A thermoplastic resin composition for molding a light-shielding container obtained by blending a black mixed pigment obtained by mixing 0.1 to 65 parts of 0.05 to 0.40 μm titanium oxide. Light-shielding container forming thermoplastic resin composition according to claim 3, by blending titanium oxide having an average particle size of 0.05~0.40μm black based mixed pigment of claim 1, claim 1, wherein The light shielding effect superior to the method of Item 2 is obtained.
[0014]
Titanium oxide used in the present invention, an average particle size not only improve the hiding property using those 0.05～0.40Myuemu, brown inorganic pigment and blue in claim 1 or claim 2 This is preferable because the amount of the organic pigment used is reduced.
An average particle size of 0.05 μm or less is not preferable because the visible light shielding effect is lowered, and an average particle size of 0.40 μm or more is not preferable because it becomes transparent and concealment is lowered.
The amount of titanium oxide used is 0.1 to 65 parts with respect to 100 parts of the thermoplastic resin. If the amount is less than 0.1 parts, the visible light shielding is not sufficiently exhibited, and titanium oxide is blended. The concealability which is the characteristic of the case is not sufficiently exhibited, and when it exceeds 65 parts, the moldability of the product using the thermoplastic resin is undesirably lowered.
[0015]
Incidentally, the amount of brown inorganic pigment and organic blue-based pigments in claim 3, may be used according to claim 1.
In particular, when titanium oxide is used in the third aspect, it is preferable to use titanium oxide having an average particle diameter of 0.10 to 0.40 μm when visually softening black or supplementing the shielding effect of the visible portion.
For this reason, the effect of claim 3 can be obtained even when manufacturing a thin container or package that does not have satisfactory light shielding properties by the method of claim 1 or claim 2 in which titanium oxide is not blended. An excellent light-shielding effect can be obtained.
[0016]
A fourth aspect is a container that can be molded using the thermoplastic resin composition for molding a light-shielding container according to any one of the first to third aspects .
The container may be a single layer of a film made of only the thermoplastic resin composition for forming a light-shielding container of the present invention, or a container formed by laminating a plurality of other resin films. In these laminated products, the number of layers is increased according to the purpose, and a film having good light shielding properties can be easily obtained by laminating the film of the present invention on one layer.
The container can be easily modified by visible light, ultraviolet light, or the like, and an optimal container for packaging foods, medical products and the like can be obtained. For example, foods exhibit an excellent effect of preserving milk, yogurt, edible oil, snack foods, etc. by shielding sunlight in the container.
[0017]
In addition, the production of the container of the present invention may be formed by a conventional method that has been widely used conventionally. For example, in a laminated container, the film using the thermoplastic resin composition for forming a light-shielding container of the present invention is used as an intermediate layer. Various kinds of laminated containers such as a three-layer laminated container comprising a printable film layer on the outer surface layer and a titanium oxide-containing resin film layer on the innermost layer can be mentioned.
[0018]
Moreover, for example, a blow molded article comprising the single layer of the thermoplastic resin composition sheet for light-shielding container molding of the present invention can be mentioned.
As the thermoplastic resin used in the present invention, polyolefin resins such as polyethylene, polypropylene and ethylene-propylene copolymer, polystyrene, polyethylene terephthalate, polyamide and the like can be used, and a mixture thereof may be used. .
And what is necessary is just to determine resin to be used for the thermoplastic resin composition for light-shielding container shaping | molding of this invention based on the form and application of a container obtained using it.
[0019]
Regarding the molding machine used at this time, various molding machines such as a blow molding machine, a T-die molding machine, an injection molding machine, and an inflation molding machine may be used according to the application.
The thermoplastic resin composition for molding a light-shielding container of the present invention and a molded product using the same can be manufactured using a conventionally employed method, a mixer, an extruder, a blow molding machine, or the like.
The thermoplastic resin composition for molding light-shielding containers of the present invention may optionally contain various additives such as antioxidants, pigments, antistatic agents, lubricants and the like as long as the properties are not impaired. .
[0020]
Examples and comparative examples are described below. In addition, a weight part is described as a part.
Example 1
MFR is 5.0, the low-density polyethylene 100 parts of density 0.93, pre-complexed iron oxide having an average particle diameter of 0.12μm as a brown inorganic pigment (CI Pigment Brown 3 3) 4 parts of a blue organic Black pigment mixed with dispersant as needed in 2 parts of copper phthalocyanine blue (CI pigment 15: 1) as a pigment was mixed using a mixing device and then kneaded at 150 ° C. using a 40 mm diameter extruder. And the thermoplastic resin composition for light-shielding container shaping | molding of this invention was manufactured.
[0021]
A thermoplastic resin film having a thickness of 50 μm was produced at a temperature of 150 ° C. using the above-described thermoplastic resin composition for forming a light-shielding container using an inflation molding machine.
A container having an internal volume of 500 ml was prepared using a three-layer light-shielding film in which the thermoplastic resin film was used as an intermediate layer, a nylon film on the outer surface, and an uncolored thermoplastic resin film on the innermost layer.
Next, for Examples 1 to 4 and Comparative Examples 1 to 6, (1) film-forming properties, (2) light-shielding properties, and (3) preservability (food) were measured by the following methods, and the results Are listed in Table 1.
[0022]
(1) Film-forming property The film-forming property of a 50 μm resin film produced using an inflation molding machine was measured visually.
○ ………… Easily formed into a film by the usual method.
Δ: Sometimes film breaks occur.
× ……… Several film breaks occur, making molding difficult.
[0023]
(2) Light-shielding property Regarding the light-shielding property of the 50 μm thick resin film used in the above (1), a low-density polyethylene used in Example 1 was mixed with 1.5% by weight of carbon black as a comparative sample, and a thickness of 50 μm. The film was used as a reference for visual comparison.
○ ……… There is a light-shielding property that is the same as the standard Δ ……… The light-shielding property is slightly inferior to the standard × ……… The light-shielding property is considerably inferior to the standard [0024]
(3) Preservability (food)
A container with an inner volume of 500 ml using a light-shielding film consisting of three layers in which the resin film having a thickness of 50 μm used in the above (1) is laminated on the intermediate layer, the nylon film on the outer surface, and the uncolored thermoplastic resin film on the innermost layer. And create.
This was filled with oil-based snack confectionery, left under sunlight for 6 hours a day for 7 days, then opened and compared for the taste of the snack confectionery.
As a reference, a comparative 500 ml container was manufactured and compared by using an aluminum vapor deposited film instead of the 50 μm thick resin film used in (1) for the intermediate film layer.
○ ………… No change from the standard △ ………… Slightly lower flavor compared to the standard × ………… Taste is changed compared to the standard [0025]
[Table 1]
Example 2
100 parts of low density polyethylene of MFR 5.0, density 0.93, 4 parts of a petite (CI Pigment Red 101) having an average particle size of 0.12 μm as a brown inorganic pigment, and anthraquinone as a blue organic pigment after mixing with a system Blue (CI pigment Blue 60) mixing device blackish mixed pigment blended with 2 parts, and kneaded at 0.99 ° C. using a 40mm diameter extruder, thermoplastic light shielding resistant container formed form of the present invention A resin composition was produced.
Thereafter, the light-shielding container formed form a thermoplastic resin composition by using a inflation molding machine to produce a resin film.
Thereafter, a light-shielding container consisting of three layers was produced using the above resin film in the same manner as in Example 1.
[0027]
Example 3
For 100 parts of polyethylene having an MFR of 5.0 and a density of 0.93, 4 parts of yellow iron oxide (CI Pigment Yellow 42) having an average particle diameter of 0.12 μm and an average particle diameter of 0.12 μm are previously used as brown inorganic pigments. 4 parts of titanium oxide and 2 parts of copper phthalocyanine blue (CI pigment 15: 1) as a blue organic pigment After mixing the dispersant using a mixing device as necessary, kneading at 150 ° C. using a 40 mm diameter extruder, the light-shielding container formed form a thermoplastic resin composition of the present invention was produced.
Thereafter, a resin film having a thickness of 50 μm is manufactured using an inflation molding machine by the same operation as in Example 1, and used as a measurement sample.
[0028]
Example 4 Example 4 is the same as Example 3 except that the polyethylene used in Example 3 is replaced with polypropylene having an MFR of 10 and a density of 0.91. The extruder temperature and the inflation molding machine temperature used at this time are 200 ° C.
[0029]
Comparative Example 1 The same as Example 1, except that the amount of brown inorganic pigment used in Example 1 is 0.65 part.
Comparative Example 2 The same as Example 1, except that the amount of the brown inorganic pigment used in Example 1 is 75 parts.
Comparative Example 3 The same as Example 1, except that the amount of the blue organic pigment used in Example 1 is 0.2 parts.
[0030]
Comparative Example 4 The same as Example 1, except that the amount of the blue organic pigment used in Example 1 is 50 parts.
Comparative Example 5 The same as Example 1, except that the average particle size of the brown inorganic pigment used in Example 1 is 0.05 μm.
Comparative Example 6 The same as Example 1, except that the average particle size of the brown inorganic pigment used in Example 1 is 0.55 μm.
[0031]
【The invention's effect】
The thermoplastic resin composition for molding light-shielding containers of the present invention is rich in light-shielding properties equivalent to carbon black blended products.
That is, the thermoplastic resin composition for forming a light-shielding container of the present invention has changed its contents even when a substance that is easily oxidized by sunlight, such as an unsaturated oil, is used in a snack confectionery container. Therefore, the present invention provides an optimal resin composition for containers such as foods and pharmaceuticals.
Further, only the thermoplastic resin is limited to the resin to be used, so that it can be easily recycled. Moreover, the container using the thermoplastic resin composition for light-shielding container of the present invention has no fear of generating harmful gas even when incinerated.
Claims (4)
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| JP2002264857A JP4133143B2 (en) | 2002-09-11 | 2002-09-11 | Thermoplastic resin composition for forming light-shielding container and container using the same |
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| JP2002264857A JP4133143B2 (en) | 2002-09-11 | 2002-09-11 | Thermoplastic resin composition for forming light-shielding container and container using the same |
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| JP6347534B2 (en) * | 2013-04-26 | 2018-06-27 | クラリアント・ファイナンス・（ビーブイアイ）・リミテッド | Pigment composition and pigment resin mixture |
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