MAGNETIC RESIN COMPOSITION FOR INJECTION MOLDING, AND INJECTION MOLDED BODY FOR MAGNETIC SHIELDS

• Main Authors: MASUDA Keisuke, FUKUHARA Koichiro, YANAGISAWA Makoto, GONDO Ryosuke
• Format: Patent
• Language: English; French; German
• Published: 07.08.2024
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; INDUCTANCES; MAGNETS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS

The present invention provides: a magnetic resin composition for injection molding, said magnetic resin composition exhibiting excellent moldability and having high relative magnetic permeability even after injection molding; and an injection molded body for magnetic shields. A magnetic resin composition according to the present invention uses, as magnetic particles (B), scale-like particles that are formed of an Fe-Si-Al alloy, and has a mass ratio of a thermoplastic resin (A) that has a melting point of from 100°C to 400°C to the Fe-Si-AI alloy of from 10/90 to 15/85; and a cross-sectional surface (52) in the thickness direction of a sheet (50) that is formed from this magnetic resin composition (1) satisfies the conditions (1) and (2) described below. (1) The total area of the magnetic particles (B) subjected to image processing is from 40% to 65% of the area of the image processing region. (2) The number of the magnetic particles (B) subjected to image processing is from 200 to 500.