JP2006225576A - Resin composition - Google Patents
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Abstract
【課題】 ポリプロピレン樹脂またはポリエチレン樹脂からなる成形品の成形寸法が、添加する顔料の種類によって異なることなく、色替えを行った場合にも、成形寸法が安定した成形品が得られる樹脂組成物を提供すること。
【解決手段】 その成形品が成形寸法の安定したものとなる樹脂組成物であって、顔料を含有するポリプロピレン樹脂またはポリエチレン樹脂に、結晶核剤が含有されてなることを特徴とする樹脂組成物。
【選択図】なしPROBLEM TO BE SOLVED: To provide a resin composition capable of obtaining a molded product having a stable molding dimension even when the color is changed without changing the molding dimension of a molded product made of polypropylene resin or polyethylene resin depending on the kind of pigment to be added. To provide.
SOLUTION: A resin composition in which the molded product has a stable molding dimension, wherein a crystal nucleating agent is contained in a polypropylene resin or polyethylene resin containing a pigment. .
[Selection figure] None
Description
本発明は、樹脂組成物に関する。更に詳しくは、ポリプロピレン樹脂またはポリエチレン樹脂に顔料を含有してなる樹脂組成物において、得られる成形品の成形寸法の安定化が達成できる樹脂組成物に関する。 The present invention relates to a resin composition. More specifically, the present invention relates to a resin composition comprising a polypropylene resin or a polyethylene resin containing a pigment and capable of achieving stabilization of the molding dimension of the resulting molded product.
従来より、結晶性のポリプロピレン樹脂またはポリエチレン樹脂を成形する場合に、添加した着色剤によって、得られる成形品の成形寸法が変化することが知られている。これは、着色剤である顔料、特に有機顔料が結晶核剤となってポリプロピレン樹脂またはポリエチレン樹脂の結晶化を促進することによると考えられる。このため、ポリプロピレン樹脂またはポリエチレン樹脂に添加する顔料の種類によって、得られる成形品の収縮率（成形寸法）が異なることが生じ、成形品の色替えを行った場合に、得られる成形品が、前色の成形品と同じ寸法のものとならないことが起こる。このことは、キャップや電子材料部品などの精密成形品や、コンテナなどの大型成形品においては深刻な問題となっている（非特許文献１参照）。 Conventionally, when a crystalline polypropylene resin or polyethylene resin is molded, it is known that the molding dimension of a molded product to be obtained varies depending on the added colorant. This is considered to be due to the fact that pigments as colorants, particularly organic pigments, become crystal nucleating agents to promote crystallization of polypropylene resin or polyethylene resin. For this reason, depending on the type of pigment added to the polypropylene resin or polyethylene resin, the shrinkage rate (molding dimension) of the obtained molded product varies, and when the molded product is color-changed, Occasionally, it does not have the same dimensions as the molded product of the previous color. This is a serious problem in precision molded products such as caps and electronic material parts and large molded products such as containers (see Non-Patent Document 1).
従って、色替えをした成形品について同じ成形寸法を得ようとすると、着色剤ごとに金型寸法の修正が必要となり、成形時の作業性などに支障がある。また、成形時に樹脂の流れ方向によって、成形品中に収縮率の異なる部分が発生し、成形品に歪みを与えることもある。このような場合には、成形品の歪みを矯正するために、成形後にアニーリングする工程が必要となる。 Therefore, when trying to obtain the same molding dimension for the molded product whose color has been changed, it is necessary to correct the mold dimension for each colorant, which hinders workability during molding. Further, depending on the flow direction of the resin during molding, a portion having a different shrinkage rate may occur in the molded product, which may cause distortion of the molded product. In such a case, in order to correct the distortion of the molded product, a step of annealing after molding is required.
これに対して、ポリプロピレン樹脂またはポリエチレン樹脂からなる成形品の成形寸法が、添加する顔料の種類によって異なるという問題を防ぐために、顔料の結晶核剤的な作用を低減させ、成形品の収縮率に影響を与えない顔料が上市されている。しかしながら、これらの顔料は、顔料が本来有している鮮明な色調及び着色力に劣るため、場合によっては成形品の品質が損なわれるという問題がある。更に、これらの顔料は高価であるため、経済性に劣るという問題もある。 On the other hand, in order to prevent the problem that the molding size of a molded product made of polypropylene resin or polyethylene resin varies depending on the type of pigment to be added, the action of the crystal nucleating agent of the pigment is reduced, and the shrinkage rate of the molded product is reduced. Pigments that have no effect are on the market. However, since these pigments are inferior in the clear color tone and tinting strength inherent to the pigments, there is a problem that the quality of the molded product is impaired in some cases. Furthermore, since these pigments are expensive, there is also a problem that they are not economical.
従って、本発明の目的は、ポリプロピレン樹脂またはポリエチレン樹脂からなる成形品の成形寸法が添加する顔料の種類によって異なることなく、色替えを行った場合にも、成形寸法が安定した成形品が得られる樹脂組成物を提供することにある。 Accordingly, an object of the present invention is to obtain a molded article having a stable molding dimension even when the color is changed without changing the molding dimension of a molded article made of polypropylene resin or polyethylene resin depending on the kind of pigment to be added. The object is to provide a resin composition.
本発明者らは、上記した課題を解決すべく鋭意検討した結果、顔料を含有するポリプロピレン樹脂またはポリエチレン樹脂に結晶核剤を添加すれば、使用する顔料の種類に関わらず、成形寸法が安定した成形品が得られ、色替えを行った場合にも一定の成形寸法に収斂した成形品が得られる樹脂組成物となることを見出して、本発明に到達した。 As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention have stabilized molding dimensions regardless of the type of pigment to be used by adding a crystal nucleating agent to a polypropylene resin or polyethylene resin containing a pigment. The present inventors have found that a molded product is obtained, and when the color is changed, the resin composition can be obtained in which a molded product converged to a certain molding size is obtained, and the present invention has been achieved.
上記の目的は、下記の本発明によって達成される。すなわち、本発明は、その成形品が成形寸法の安定したものとなる樹脂組成物であって、顔料を含有するポリプロピレン樹脂またはポリエチレン樹脂に、結晶核剤が含有されてなることを特徴とする樹脂組成物である。 The above object is achieved by the present invention described below. That is, the present invention is a resin composition in which a molded product has a stable molding dimension, and is characterized in that a crystal nucleating agent is contained in a polypropylene resin or a polyethylene resin containing a pigment. It is a composition.
また、本発明にかかる樹脂組成物の好ましい形態としては、上記結晶核剤は、ソルビトール系結晶核剤、安息香酸塩系結晶核剤、リン酸塩系結晶核剤およびノルボルネンジカルボン酸塩系結晶核剤からなる群から選ばれる樹脂組成物、或いは、結晶核剤が、ポリプロピレン樹脂またはポリエチレン樹脂１００質量部に対して、０．０１〜５質量部含有されてなる樹脂組成物が挙げられる。 In addition, as a preferable form of the resin composition according to the present invention, the crystal nucleating agent includes a sorbitol crystal nucleating agent, a benzoate crystal nucleating agent, a phosphate crystal nucleating agent, and a norbornene dicarboxylate based crystal nucleus. Examples thereof include a resin composition selected from the group consisting of an agent or a resin composition containing 0.01 to 5 parts by mass of a crystal nucleating agent with respect to 100 parts by mass of a polypropylene resin or a polyethylene resin.
本発明にかかる樹脂組成物を用いることで、樹脂組成物に添加する顔料を替えた場合にも、同一の金型で、成形寸法の安定した各色の成形品を得ることができ、従来、色替え時に起こりやすかった成形品の成形寸法が変化するといった問題が解消される。更に、成形時における樹脂の流れ方向による成形品の歪みの発生の問題が解消された、成形寸法の安定した成形品が得られる樹脂組成物が提供される。 By using the resin composition according to the present invention, even when the pigment added to the resin composition is changed, it is possible to obtain molded products of various colors with stable molding dimensions using the same mold. The problem that the molding dimension of the molded product that is likely to occur at the time of replacement is solved. Furthermore, a resin composition is provided in which a molded product with a stable molding dimension is obtained, which eliminates the problem of distortion of the molded product due to the flow direction of the resin during molding.
次に、好ましい実施の形態を挙げて本発明を更に詳細に述べる。先ず、本発明にかかる樹脂組成物を構成するポリプロピレン樹脂またはポリエチレン樹脂について説明する。本発明に使用するポリプロピレン樹脂としては、ホモポリプロピレン樹脂、ランダムポリプロピレン樹脂およびブロックポリプロピレン樹脂など、更に、これらの混合物が挙げられる。これらはいずれも結晶性のポリプロピレン樹脂であり、その融点は、１２０〜１６５℃の範囲のものである。 Next, the present invention will be described in more detail with reference to preferred embodiments. First, the polypropylene resin or polyethylene resin constituting the resin composition according to the present invention will be described. Examples of the polypropylene resin used in the present invention include homopolypropylene resins, random polypropylene resins, and block polypropylene resins, and further mixtures thereof. These are all crystalline polypropylene resins, and their melting points are in the range of 120 to 165 ° C.
本発明に使用するポリエチレン樹脂としては、高密度ポリエチレン樹脂（ＨＤＰＥ）、線状低密度ポリエチレン樹脂（ＬＬＤＰＥ）および低密度ポリエチレン樹脂（ＬＤＰＥ）など、更に、これらの混合物が挙げられる。これらはいずれも結晶性のポリエチレン樹脂であり、その融点は、１００〜１３５℃の範囲のものである。 Examples of the polyethylene resin used in the present invention include a high density polyethylene resin (HDPE), a linear low density polyethylene resin (LLDPE), and a low density polyethylene resin (LDPE), and a mixture thereof. These are all crystalline polyethylene resins, and their melting points are in the range of 100 to 135 ° C.
本発明にかかる樹脂組成物は、上記した樹脂に顔料が含有されてなるが、特に有機顔料である場合に、前記した本発明の顕著な効果が得られる。有機顔料としては、フタロシアニン系顔料、キナクリドン系顔料、イソインドリノン系顔料、イソインドリン系顔料、アンスラキノン系顔料、ペリレン系顔料、ペリノン系顔料、アゾ系顔料、ポリアゾ系顔料、イミダゾロン系顔料、キノフタロン系顔料、ジケトピロロピロール（ＤＰＰ）系顔料およびジオキサジン系顔料などが挙げられる。これらの顔料は、ポリプロピレン樹脂またはポリエチレン樹脂に含有させた場合に、成形品の収縮率（成形寸法）に影響を与える。また、その収縮率の値は顔料の種類によって変化し、一定ではない。そして、樹脂組成物中のこれらの顔料の含有量は微量でも、樹脂組成物の成形後の収縮率に影響を与える。上記した中でも、特に、キノフタロン系顔料、ジケトピロロピロール（ＤＰＰ）系顔料およびジオキサジン系顔料などを、樹脂の着色剤として使用した場合に、本発明にかかる構成とすることによる顕著な効果が得られる。 The resin composition according to the present invention contains the pigment in the above-described resin, and particularly when the resin composition is an organic pigment, the remarkable effects of the present invention described above can be obtained. Organic pigments include phthalocyanine pigments, quinacridone pigments, isoindolinone pigments, isoindoline pigments, anthraquinone pigments, perylene pigments, perinone pigments, azo pigments, polyazo pigments, imidazolone pigments, and quinophthalone. And pigments such as diketopyrrolopyrrole (DPP) pigments and dioxazine pigments. When these pigments are contained in polypropylene resin or polyethylene resin, they affect the shrinkage rate (molding dimension) of the molded product. Further, the value of the shrinkage rate varies depending on the type of pigment and is not constant. And even if the content of these pigments in the resin composition is very small, it affects the shrinkage rate after molding of the resin composition. Among the above, particularly when a quinophthalone pigment, a diketopyrrolopyrrole (DPP) pigment, a dioxazine pigment or the like is used as a resin colorant, a remarkable effect is obtained by the configuration according to the present invention. It is done.
本発明にかかる樹脂組成物中の顔料の含有量は、通常、ポリプロピレン樹脂またはポリエチレン樹脂１００質量部に対して０．００１質量部〜１０質量部である。顔料の含有量が０．００１質量部未満では得られる成形品に十分な着色を与えることができず、１０質量部を超えると樹脂物性が低下するので好ましくない。 Content of the pigment in the resin composition concerning this invention is 0.001 mass part-10 mass parts normally with respect to 100 mass parts of polypropylene resins or polyethylene resins. If the pigment content is less than 0.001 part by mass, sufficient coloration cannot be imparted to the resulting molded product, and if it exceeds 10 parts by mass, the physical properties of the resin will deteriorate, such being undesirable.
次に、本発明を特徴づける結晶核剤について説明する。本発明において使用する結晶核剤としては、ソルビトール系結晶核剤、安息香酸塩系結晶核剤、リン酸塩系結晶核剤およびノルボルネンジカルボン酸塩系結晶核剤などが例示できる。但し、タルクやガラス繊維などの核剤は有効ではなく、前記した本発明の顕著な効果を達成するものとしては、好適なものではない。 Next, the crystal nucleating agent characterizing the present invention will be described. Examples of the crystal nucleating agent used in the present invention include sorbitol-based crystal nucleating agents, benzoate-based crystal nucleating agents, phosphate-based crystal nucleating agents, and norbornene dicarboxylate-based crystal nucleating agents. However, nucleating agents such as talc and glass fiber are not effective, and are not suitable for achieving the remarkable effects of the present invention described above.
樹脂組成物中における上記に列挙したような結晶核剤の好ましい含有量は、ポリプロピレン樹脂またはポリエチレン樹脂１００質量部に対して、０．０１質量部〜５質量部である。結晶核剤の含有量が０．０１質量部未満では、前記した本発明の顕著な効果が十分に発現されない場合があるので好ましくなく、５質量部を超えても成形後の成形寸法の安定化に対する効果に顕著な差はなく、経済性の点から好ましくない。 The preferable content of the crystal nucleating agent as listed above in the resin composition is 0.01 part by mass to 5 parts by mass with respect to 100 parts by mass of the polypropylene resin or the polyethylene resin. If the content of the crystal nucleating agent is less than 0.01 parts by mass, the above-described remarkable effects of the present invention may not be sufficiently exhibited. There is no significant difference in the effect on the value, which is not preferable from the viewpoint of economy.
なお、本発明にかかる樹脂組成物には、必要に応じて、紫外線吸収剤、光安定剤、酸化防止剤、難燃剤、帯電防止剤、スリップ剤或いは無機フィラーなど、通常、樹脂組成物に使用される各種添加剤を含有していてもよい。 The resin composition according to the present invention is usually used in a resin composition such as an ultraviolet absorber, a light stabilizer, an antioxidant, a flame retardant, an antistatic agent, a slip agent, or an inorganic filler, if necessary. Various additives to be used may be contained.
次に、本発明にかかる樹脂組成物の製造方法、更に、該樹脂組成物を使用して成形品を製造する方法について、例を挙げて説明する。本発明にかかる樹脂組成物は、その利便性から、主に、着色樹脂ペレット或いはマスターバッチとして提供することが好ましい。
（イ）着色樹脂ペレットは、ポリプロピレン樹脂またはポリエチレン樹脂に、顔料と結晶核剤の両方、及び必要に応じて適宜に添加剤を含有させて混合し、溶融混練してペレタイズすることによって得られる。
（ロ）マスターバッチは、ポリプロピレン樹脂またはポリエチレン樹脂に、顔料と結晶核剤の両方を高濃度に含有させ、必要に応じて適宜に添加剤を含有させた材料を混合し、溶融混練してペレタイズすることによって得られる。
Next, a method for producing a resin composition according to the present invention and a method for producing a molded product using the resin composition will be described with examples. It is preferable to provide the resin composition concerning this invention mainly as a colored resin pellet or a masterbatch from the convenience.
(A) Colored resin pellets can be obtained by mixing and mixing polypropylene pigment or polyethylene resin with both pigment and crystal nucleating agent and, if necessary, additives as appropriate, melt-kneading and pelletizing.
(B) The masterbatch is made of polypropylene resin or polyethylene resin containing both pigment and crystal nucleating agent in high concentration, mixed with materials containing additives as needed, melt-kneaded and pelletized. It is obtained by doing.
本発明にかかる樹脂組成物は、射出成形、パイプや異型に使用される押出成形、ブロー成形、インフレーション成形或いはＴダイ成形など任意の方法に使用可能である。勿論、これらの成形方法に限定されるものではなく、本発明にかかる樹脂組成物を使用することによって、いずれの場合も、成形寸法の安定した成形品を製造することができる。 The resin composition concerning this invention can be used for arbitrary methods, such as injection molding, the extrusion molding used for a pipe and a different shape, blow molding, inflation molding, or T-die molding. Of course, it is not limited to these molding methods, and by using the resin composition according to the present invention, a molded product having a stable molding dimension can be produced in any case.
以下に、実施例を挙げて本発明を詳細に説明する。本発明は、これらの実施例に限定されるものではない。なお、文中、部とあるのは特に断りのない限り質量基準である。 Hereinafter, the present invention will be described in detail with reference to examples. The present invention is not limited to these examples. In the text, “part” is based on mass unless otherwise specified.
［実施例１］
三井ポリプロＪ１０４（ホモポリプロピレン樹脂、ＭＦＲ＝９．０、三井化学製）１００部に、結晶核剤として、アデカスタブＮＡ−２１（リン酸塩系結晶核剤、旭電化製）を０．１部、下記に示した各有機顔料を０．２部、ステアリン酸マグネシウムを０．２部添加し、ブレンドした混合物を２５ｍｍφ同方向二軸押出機にて２００℃で混練・ペレット化して、色の異なる５種類の着色樹脂ペレットを作製した。また、その成形時における収縮率の比較のために、顔料を含有しない以外は上記と同様にして、無着色（ブランク）の樹脂ペレットを作製した。
[Example 1]
100 parts of Mitsui Polypro J104 (homopolypropylene resin, MFR = 9.0, manufactured by Mitsui Chemicals), 0.1 parts of ADK STAB NA-21 (phosphate crystal nucleating agent, manufactured by Asahi Denka) as a crystal nucleating agent, 0.2 parts of each organic pigment shown below and 0.2 parts of magnesium stearate were added, and the blended mixture was kneaded and pelletized at 200 ° C. in a 25 mmφ co-directional twin-screw extruder to produce 5 different colors. Various colored resin pellets were prepared. Further, for comparison of the shrinkage rate at the time of molding, an uncolored (blank) resin pellet was produced in the same manner as described above except that the pigment was not contained.
上記において使用した顔料は、イルガジンエロー３ＲＬＴＮ（イソインドリノンエロー）、クロモフタルレッド２０３０（ジケトピロロピロール（ＤＰＰ）レッド）、ＰＶファーストピンクＰＴ（キナクリドンレッド）、クロモファインブルー４９２０（シアニンブルー）、クロモファイングリーン２ＧＯ（シアニングリーン）を使用した。 The pigments used in the above are Irgazine Yellow 3RLTN (Isoindolinone Yellow), Chromophthal Red 2030 (Diketopyrrolopyrrole (DPP) Red), PV First Pink PT (Quinacridone Red), Chromofine Blue 4920 (Cyanine Blue) Chromofine Green 2GO (Cyanine Green) was used.
＜評価＞
上記で得た６種類のペレットをそれぞれ用いて、型締め圧５０ｔの射出成形機にて、２００℃で成形棒（１２７ｍｍ×１２．５ｍｍ×６．３ｍｍ）を成形した。そして、使用した金型の寸法と各成形棒の寸法から、下記計算式により、それぞれのペレットを使用した場合の成形品の収縮率を算出した。得られた結果を表１にまとめて示した。
収縮率（％）＝［（金型の長手方向の寸法−成形棒の長手方向の寸法）／金型の長手方向の寸法］×１００
<Evaluation>
Using each of the six types of pellets obtained above, a molding rod (127 mm × 12.5 mm × 6.3 mm) was molded at 200 ° C. with an injection molding machine with a clamping pressure of 50 t. And the shrinkage | contraction rate of the molded article at the time of using each pellet was computed with the following formula from the dimension of the used metal mold | die, and the dimension of each shaping | molding rod. The obtained results are summarized in Table 1.
Shrinkage rate (%) = [(longitudinal dimension of mold−longitudinal dimension of forming rod) / longitudinal dimension of mold] × 100
［実施例２］
結晶核剤をハイパーフォームＨＰＮ６８（ノルボルネンジカルボン酸塩系結晶核剤）に代えた以外は、実施例１と同様にして、色の異なる５種類の着色樹脂ペレットと、その成形時における収縮率の比較のために、顔料を含有しない無着色（ブランク）の樹脂ペレットを作製した。そして、これらのペレットを使用して実施例１の場合と同様に成形棒を得、該成形棒の収縮率を算出した。得られた結果を表１にまとめて示した。
[Example 2]
Except that the crystal nucleating agent was replaced with hyperform HPN68 (norbornene dicarboxylate-based crystal nucleating agent), in the same manner as in Example 1, five types of colored resin pellets having different colors were compared with the shrinkage rate at the time of molding. Therefore, an uncolored (blank) resin pellet containing no pigment was prepared. Then, using these pellets, a molded rod was obtained in the same manner as in Example 1, and the shrinkage rate of the molded rod was calculated. The obtained results are summarized in Table 1.
［実施例３］
実施例１で使用したポリプロピレン樹脂を、ジェーレックス６０８０（ＨＤＰＥ、ＭＦＲ＝６．０）に代え、さらに、結晶核剤をアデカスタブＮＡ−１１（リン酸塩系結晶核剤）に代えた以外は実施例１と同様にして、色の異なる５種類の着色樹脂ペレットと、その成形時における収縮率の比較のために、顔料を含有しない無着色（ブランク）の樹脂ペレットを作製した。そして、これらのペレットを使用して実施例１の場合と同様に成形棒を得、該成形棒の収縮率を算出した。得られた結果を表１にまとめて示した。
[Example 3]
The procedure was carried out except that the polypropylene resin used in Example 1 was replaced with J-Rex 6080 (HDPE, MFR = 6.0), and the crystal nucleating agent was replaced with ADK STAB NA-11 (phosphate crystal nucleating agent). In the same manner as in Example 1, five kinds of colored resin pellets having different colors and uncolored (blank) resin pellets containing no pigment were prepared for comparison of shrinkage ratios during molding. Then, using these pellets, a molded rod was obtained in the same manner as in Example 1, and the shrinkage ratio of the molded rod was calculated. The obtained results are summarized in Table 1.
［実施例４］
結晶核剤をゲルオールＭＤ（ソルビトール系結晶核剤）に代えた以外は、実施例３と同様にして、色の異なる５種類の着色樹脂ペレットと、その成形時における収縮率の比較のために、顔料を含有しない無着色（ブランク）の樹脂ペレットを作製した。そして、これらのペレットを使用して実施例１の場合と同様に成形棒を得、該成形棒の収縮率を算出した。得られた結果を表１にまとめて示した。
[Example 4]
Except that the crystal nucleating agent was replaced with gelol MD (sorbitol-based crystal nucleating agent), in the same manner as in Example 3, for comparison of the five kinds of colored resin pellets having different colors and the shrinkage rate at the time of molding, An uncolored (blank) resin pellet containing no pigment was prepared. Then, using these pellets, a molded rod was obtained in the same manner as in Example 1, and the shrinkage rate of the molded rod was calculated. The obtained results are summarized in Table 1.
［比較例１］
結晶核剤を使用しないこと以外は実施例１と同様にして、色の異なる５種類の着色樹脂ペレットと、その成形時における収縮率の比較のために、顔料を含有しない無着色（ブランク）の樹脂ペレットを作製した。そして、これらのペレットを使用して実施例１の場合と同様に成形棒を得、該成形棒の収縮率を算出した。得られた結果を表１にまとめて示した。
[Comparative Example 1]
In the same manner as in Example 1 except that no crystal nucleating agent is used, five types of colored resin pellets having different colors and a non-colored (blank) containing no pigment are used for comparison of shrinkage ratio at the time of molding. Resin pellets were prepared. Then, using these pellets, a molded rod was obtained in the same manner as in Example 1, and the shrinkage rate of the molded rod was calculated. The obtained results are summarized in Table 1.
［比較例２］
結晶核剤を使用しないこと以外は実施例３と同様にして、色の異なる５種類の着色樹脂ペレットと、その成形時における収縮率の比較のために、顔料を含有しない無着色（ブランク）の樹脂ペレットを作製した。そして、これらのペレットを使用して実施例１の場合と同様に成形棒を得、該成形棒の収縮率を算出した。得られた結果を表１にまとめて示した。
[Comparative Example 2]
In the same manner as in Example 3 except that no crystal nucleating agent was used, for comparison of the shrinkage rate at the time of molding with five types of colored resin pellets having different colors, no pigment (blank) containing no pigment was used. Resin pellets were prepared. Then, using these pellets, a molded rod was obtained in the same manner as in Example 1, and the shrinkage rate of the molded rod was calculated. The obtained results are summarized in Table 1.
表１の結果より、顔料と結晶核剤とを含有する本実施例の樹脂組成物から得られた成形品の収縮率は一定であり、無着色（ブランク）の場合の収縮率と同じであることが認められる。一方、結晶核剤を含有しない比較例の樹脂組成物から得られた成形品の収縮率は、使用する顔料によって不揃いであり、安定しないことがわかった。表１に示した通り、この結果は、使用した樹脂がポリプロピレン或いはポリエチレンのいずれの場合においても同様である。 From the results in Table 1, the shrinkage ratio of the molded product obtained from the resin composition of this example containing the pigment and the crystal nucleating agent is constant and is the same as that in the case of no color (blank). It is recognized that On the other hand, it was found that the shrinkage rate of the molded product obtained from the comparative resin composition containing no crystal nucleating agent was uneven depending on the pigment used and was not stable. As shown in Table 1, this result is the same regardless of whether the resin used is polypropylene or polyethylene.
本発明により得られた樹脂組成物を用いると、成形時において同一の金型で各色の成形が可能になり、色替え時に起こりやすい成形寸法の不揃いを解消することができる。同時に成形品の歪みを解消することも可能である。特に、精密部品や大型部品を成形する場合に、本発明の樹脂組成物を使用して成形することが有効である。
When the resin composition obtained according to the present invention is used, it is possible to mold each color with the same mold during molding, and it is possible to eliminate irregular molding dimensions that are likely to occur during color change. At the same time, it is possible to eliminate distortion of the molded product. In particular, when molding precision parts and large parts, it is effective to mold using the resin composition of the present invention.
Claims (3)
The resin composition according to claim 1 or 2, wherein the crystal nucleating agent is contained in an amount of 0.01 to 5 parts by mass with respect to 100 parts by mass of a polypropylene resin or a polyethylene resin.
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| JP2011111579A (en) * | 2009-11-30 | 2011-06-09 | Asahi Kasei Chemicals Corp | Polyethylene resin composition for bottle cap |
| WO2013168717A1 (en) * | 2012-05-11 | 2013-11-14 | 株式会社Adeka | Transparentizing agent composition, resin composition and molded article |
| JP2014503679A (en) * | 2011-01-25 | 2014-02-13 | ミリケン・アンド・カンパニー | Additive composition and thermoplastic polymer composition containing the same |
| JP2016531958A (en) * | 2013-09-23 | 2016-10-13 | ミリケン・アンド・カンパニーＭｉｌｌｉｋｅｎ ＆ Ｃｏｍｐａｎｙ | Polyethylene articles |
| JP2021046457A (en) * | 2019-09-17 | 2021-03-25 | 新日本理化株式会社 | Crystallization promoter for polyolefin-based resin, and polyolefin-based resin composition containing the crystallization promoter |
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| JP7368705B2 (en) | 2019-09-17 | 2023-10-25 | 新日本理化株式会社 | Crystallization promoter for polyolefin resin, and polyolefin resin composition containing the crystallization promoter |
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