High magnetic strenght magnets containing a flexible...

Details High magnetic strenght magnets containing a flexible... High magnetic strenght magnets containing a flexible...

C - Chemistry, Metallurgy

08

F

402/322, 400/511

C08F 220/12 (2006.01) C08L 33/06 (2006.01) H01F 1/08 (2006.01) H01F 1/117 (2006.01) H01F 1/375 (2006.01)

Patent

CA 1339867

An emulsion acrylate copolymer is provided which unexpectedly is an effective magnetic binder inasmuch as it can be loaded with high amounts of one or more magnetic particles such as ferrite or ferrite containing materials to provide a flexible permanent type magnetic composition of high magnetic energy. The copolymer is made from an alkyl acrylate and a salt of 2-acrylamido-2-methylpropane sulfonic acid (AMPS~). A carboxylated ethoxy alkyl phenol surfactant is utilized which provides good processability and permits a blend of the magnetic particles with the emulsion acrylate copolymer to be precipitated from a latex solution by high shear mixing. Flexible high magnetic energy magnets can thus be made and utilized in various applications such as refrigerator doors, electrical motors, and the like.

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