TONER

• Main Authors: MURATA MASAKAZU, SHIMIZU AKITAKA
• Format: Patent
• Language: English; Japanese
• Published: 12.08.2021
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

To provide a method for producing a toner exhibiting excellent image density of a printed matter and hot offset resistance, and a toner.SOLUTION: [1] A method for producing a toner includes a step 1 of aggregating resin particles X containing an amorphous resin A having a component derived from hydrocarbon wax W1 having a hydroxyl group or a carboxy group and a polyester resin segment in an aqueous medium in the presence of a wax D1, a wax D2 and a colorant, and obtaining aggregated particles; and a step 2 of fusing the aggregated particles obtained in the step 1. A melting point Tm1 of the wax D1 is lower than a melting point Tm2 of the wax D2, in the step 2, a temperature T at which the aggregated particles are fused in the step 2 is equal to or higher than a temperature that is lower than the melting point Tm1 of the wax D1 by 10°C or more and is equal to or lower than a temperature higher than the melting point Tm2 of the wax D2 by 10°C or more. [2] A toner contains an amorphous resin A having a component derived from hydrocarbon wax W1 having a hydroxyl group or a carboxy group and a polyester resin segment, a wax D1, a wax D2 and a colorant. A melting point Tm1 of the wax D1 is lower than a melting point Tm2 of the wax D2.SELECTED DRAWING: None 【課題】優れた印刷物の画像濃度及び耐ホットオフセット性を示すトナーの製造方法、及びトナーに関する。【解決手段】〔１〕工程１：水酸基又はカルボキシ基を有する炭化水素ワックスＷ１由来の構成成分及びポリエステル樹脂セグメントを有する非晶性樹脂Ａを含有する樹脂粒子Ｘを、水性媒体中で、ワックスＤ１、ワックスＤ２、及び着色剤の存在下で凝集させて、凝集粒子を得る工程と、工程２：前記工程１で得られた凝集粒子を融着させる工程と、を含む、トナーの製造方法であって、前記ワックスＤ１の融点Ｔｍ１が前記ワックスＤ２の融点Ｔｍ２より低く、且つ、工程２において凝集粒子を融着させる温度Ｔは、前記ワックスＤ１の融点Ｔｍ１より１０℃低い温度以上、前記ワックスＤ２の融点Ｔｍ２より１０℃高い温度以下である、トナーの製造方法、〔２〕水酸基又はカルボキシ基を有する炭化水素ワックスＷ１由来の構成成分及びポリエステル樹脂セグメントを有する非晶性樹脂Ａと、ワックスＤ１と、ワックスＤ２と、着色剤とを含み、前記ワックスＤ１の融点Ｔｍ１が前記ワックスＤ２の融点Ｔｍ２より低い、トナー。【選択図】なし