Crystalline radical polymerizable composition for fixing a magnet of a rotating electric machine rotor core, a rotating electric machine rotor core using the composition, and a method of manufacturing the rotating electric machine rotor core

A method for fixing a magnet inserted in a magnet accommodating portion provided in a rotor core of a rotating electric machine formed of a laminated steel sheet and the laminated steel sheet,

• comprising a step of carrying out a fixation between the magnet and the laminated steel sheet using a crystalline radical polymerizable composition,
• wherein the crystalline radical polymerizable composition contains at least a crystalline radical polymerizable compound A, an inorganic filler B, a silane coupling agent C, and a radical polymerization initiator D,
• wherein the crystalline radical polymerizable compound A is solid at 23° C. and has the property capable of imparting fluidity by heating,
• wherein the inorganic filler B is contained in an amount of 50 to 90% by mass based on the total amount of the crystalline radical polymerizable composition, and the melt viscosity of the crystalline radical polymerizable composition measured by an enhanced flow tester is 500 Pa·s or more at 90° C. and a shear rate of 1/s,
• wherein the melt viscosity of the crystalline radical polymerizable composition measured by the enhanced flow tester is 100 Pa's or less at 90° C. and a shear rate of 250/s, and
• wherein the quotient (A)/(B) of the melt viscosity of the crystalline radical polymerizable composition measured by the enhanced flow tester is in the range of 10 to 100
• (A) Melt viscosity at shear rate 1/s
• (B) Melt viscosity at a shear rate of 250/s.