US 12,075,606 B2
Orientation of magnetic fillers to optimize film properties
Michael S. Graff, Woodbury, MN (US); Derek J. Dehn, Maplewood, MN (US); Paul T. Hines, St. Paul, MN (US); Charles L Bruzzone, Woodbury, MN (US); Bharat R. Acharya, Woodbury, MN (US); Ronald D. Jesme, Plymouth, MN (US); William J. Kopecky, Hudson, WI (US); Jennifer J. Sokol, Mahtomedi, MN (US); and Sergei A. Manuilov, Bayport, MN (US)
Assigned to 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Appl. No. 17/607,991
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed May 8, 2020, PCT No. PCT/IB2020/054388
§ 371(c)(1), (2) Date Nov. 1, 2021,
PCT Pub. No. WO2020/229975, PCT Pub. Date Nov. 19, 2020.
Claims priority of provisional application 62/848,245, filed on May 15, 2019.
Prior Publication US 2022/0354032 A1, Nov. 3, 2022
Int. Cl. H05K 9/00 (2006.01); H01F 1/20 (2006.01); H01F 1/26 (2006.01); H01F 1/28 (2006.01); H01F 27/36 (2006.01); H01F 38/14 (2006.01); H01F 41/16 (2006.01)
CPC H05K 9/0075 (2013.01) [H01F 1/20 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A magnetic shielding film comprising opposing first and second major surfaces and a plurality of particles dispersed therebetween, each particle having a magnetic permeability, a thickness H along a thickness direction of the particle, and a longest dimension L along a length direction of the particle orthogonal to the thickness direction, L/H greater than or equal to 2, the particles defining a plurality of voids therebetween, the length directions of at least 60% of the particles oriented within 5.5 degrees of a same orientation direction,
such that in a cross-section of the magnetic shielding film in a vertical direction substantially orthogonal to at least one of the first and second major surfaces, the magnetic shielding film comprises a plurality of pairs of vertically adjacent particles, wherein a plurality of substantially parallel elongate polymeric elements connects the particles in each of the pairs of vertically adjacent particles.