	US 11,987,695 B2
	Resin composition for forming magnetic member and method for manufacturing magnetic member
Masato Yoshida, Tokyo (JP); Wakana Nobe, Tokyo (JP); and Kensuke Notsu, Tokyo (JP)
Assigned to SUMITOMO BAKELITE CO., LTD., Tokyo (JP)
Appl. No. 17/611,687
Filed by SUMITOMO BAKELITE CO., LTD., Tokyo (JP)
PCT Filed Apr. 8, 2020, PCT No. PCT/JP2020/015869 § 371(c)(1), (2) Date Nov. 16, 2021, PCT Pub. No. WO2020/235246, PCT Pub. Date Nov. 26, 2020.
Claims priority of application No. 2019-093896 (JP), filed on May 17, 2019; and application No. 2019-199674 (JP), filed on Nov. 1, 2019.
Prior Publication US 2022/0213312 A1, Jul. 7, 2022
Int. Cl. C08L 63/00 (2006.01); B29C 43/00 (2006.01); H01F 1/28 (2006.01); H01F 41/02 (2006.01); B29K 63/00 (2006.01); B29K 505/12 (2006.01); B29K 509/02 (2006.01); B29L 31/34 (2006.01); H01F 27/255 (2006.01)

CPC C08L 63/00 (2013.01) [B29C 43/003 (2013.01); H01F 1/28 (2013.01); H01F 41/02 (2013.01); B29K 2063/00 (2013.01); B29K 2505/12 (2013.01); B29K 2509/02 (2013.01); B29K 2995/0008 (2013.01); B29L 2031/34 (2013.01); C08L 2205/02 (2013.01); H01F 27/255 (2013.01)]

17 Claims

1. A resin composition for forming a magnetic member, which is used for compression molding, comprising:

a thermosetting resin;

magnetic particles; and

non-magnetic particles having a lower specific gravity and a smaller cumulative 50% particle diameter D₅₀than the magnetic particles,

wherein the resin composition for forming a magnetic member is solid at 25° C.,

wherein the magnetic particles include two or more kinds of iron-based particles having different average particle diameters,

wherein the thermosetting resin includes an epoxy resin, and

wherein an amount of the epoxy resin in the resin composition is 0.5 to 20% by mass based on the entire resin composition.