RESIN COLORING MASTER BATCH, RESIN COMPOSITION AND METHOD FOR PRODUCING MOLDED ARTICLE THEREOF

PROBLEM TO BE SOLVED: To provide a method for easily producing a resin coloring master batch which contains no coarse particles of a coloring material such as a pigment or a dye in a master batch and in which a coloring material is homogeneously dispersed in a master batch resin and to provide a method for producing a thermoplastic resin composition and a molded article using the resin coloring master batch.SOLUTION: There is provided a method for producing a resin coloring master batch which comprises: a step (1) of preliminarily melt-kneading a coloring material (a1) and a thermoplastic resin (b1) to obtain a first master batch (m1); and a step (2) of melt-kneading a batch obtained by further adding a thermoplastic resin (b2) to the first master batch (m1) obtained in the step (1). In addition, there is provided a method for producing a thermoplastic resin composition which comprises a step (3) of melt-kneading a batch obtained by adding a thermoplastic resin (c) to the resulting resin coloring master batch (m2). 【課題】 マスターバッチ中に顔料や染料などの色素の粗大粒子がなく、マスターバッチ用樹脂中に色素が均一に分散された樹脂着色用マスターバッチを簡便に製造する方法、さらに当該樹脂着色用マスターバッチを用いた熱可塑性樹脂組成物、成形品の製造方法を提供すること。【解決手段】 予め色素（ａ１）および熱可塑性樹脂（ｂ１）を溶融混練して第１マスターバッチ（ｍ１）を得る工程（１）、前記工程（１）で得られた第１マスターバッチ（ｍ１）に、さらに、熱可塑性樹脂（ｂ２）を加えて溶融混練する工程（２）、を有する樹脂着色用マスターバッチの製造方法、さらに、得られた樹脂着色用マスターバッチ（ｍ２）に、熱可塑性樹脂（ｃ）を加えて溶融混練する工程（３）を有する熱可塑性樹脂組成物の製造方法。【選択図】 なし