MAGNETIC RESIN COMPOSITION FOR INJECTION MOLDING AND INJECTION MOLDED PRODUCT FOR MAGNETIC SHIELD

• Main Authors: MASUDA KEISUKE, GONDO RYOSUKE, YANAGISAWA MAKOTO, FUKUHARA KOICHIRO
• Format: Patent
• Language: English; Japanese
• Published: 21.01.2022
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BASIC ELECTRIC ELEMENTS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; ELECTRICITY; GENERAL PROCESSES OF COMPOUNDING; INDUCTANCES; MAGNETS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSFORMERS; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

To provide a magnetic resin composition for injection molding which has high relative magnetic permeability even when being subjected to injection molding, and is excellent in moldability, and an injection molding for magnetic shield.SOLUTION: A magnetic resin composition uses scaly particles composed of an Fe-Si-Al alloy as magnetic particles (B), in which a mass ratio of a thermoplastic resin (A) having a melting point of 100-400°C to the Fe-Si-Al alloy is 10/90 to 15/85, and a cut surface in a thickness direction of a sheet formed of a magnetic resin composition satisfies conditions (1) and (2). (1) The total area of the magnetic particles (B) that have been subjected to image processing is 40-65% of the area of an image processing region. (2) The number of magnetic particles (B) that have been subjected to image processing is 200-500.SELECTED DRAWING: Figure 2B 【課題】射出成形を行っても比透磁率が高く、成形加工性に優れる射出成形用磁性樹脂組成物および磁性シールド用射出成形体を提供する。【解決手段】本発明の磁性樹脂組成物は、磁性粒子（Ｂ）としてＦｅ－Ｓｉ－Ａｌ合金からなる鱗片状粒子を用い、融点が１００～４００℃の熱可塑性樹脂（Ａ）／Ｆｅ－Ｓｉ－Ａｌ合金の質量比を１０／９０～１５／８５とし、磁性樹脂組成物から形成したシートの厚み方向の切断面が（１）、（２）の条件を満たす。（１）画像処理した磁性粒子（Ｂ）の総面積が画像処理領域の面積の４０～６５％である。（２）画像処理した磁性粒子（Ｂ）の個数が２００～５００個である。【選択図】図２Ｂ