Patent ID: 8852840
Filing Date: 2014-10-07
Classification: B22F,C22C,G03G,H01F

Abstract:
1. Magnetic composite particles having an average particle diameter of 10 to 100 μm and comprising at least: magnetic fine particles which are contained in the magnetic composite particles in an amount of 50 to 99.9% by weight, and a bio-based polymer which has a glass transition point of 45° C. or more and selected from the group consisting of: polylactic acid, polyglycolic acid, poly(trimethylene terephthalate), poly-α-methylene-γ-butyrolactone, chitin and a chitosan/alginic acid composite material; a copolymer comprising a monomer unit derived from polylactic acid, polyglycolic acid, poly(trimethylene terephthalate) and poly-α-methylene-γ-butyrolactone; and a polymer mixture comprising at least one of polylactic acid, polyglycolic acid, poly(trimethylene terephthalate) and poly-α-methylene-γ-butyrolactone: together with chitin and/or a chitosan/alginic acid composite material; wherein the magnetic composite particles are devoid of resins derived from underground sources.