Title:
BOND MAGNET AND COMPOSITION FOR BOND MAGNET
Document Type and Number:
Japanese Patent JP2019067957
Kind Code:
A
Abstract:
To provide a composition for a bond magnet, by which a bond magnet superior in both of heat resistance and magnetic characteristic can be obtained while ensuring moldability.SOLUTION: A composition of the present invention comprises one or more kinds of rare earth magnet particles and a binding resin, and is used for manufacturing a bond magnet. The rare earth magnet particles include at least Nd-based magnet particles in which a rare earth element is Nd, and the total amount of the rare earth magnet particles is 90-95 mass% to a whole amount of the composition. The binding resin consists of polyamide 66(PA66) in which a total amount of terminal groups consisting of carboxyl and amino groups is 175 mmol/kg or less to a total amount of the binding resin. Even if PA66 of which the total amount of the terminal groups is adjusted touches the rare earth magnet particles serving to bring about a catalyst effect, the start of the increase in viscosity is delayed. So, the stable moldability can be ensured even if the content of the rare earth magnet particles is large. A bond magnet which can be obtained from the composition like this would be superior in both of magnetic characteristic and heat resistance.SELECTED DRAWING: Figure 2A
Inventors:
MASAI YUYA
NEGI YUKINARI
NEGI YUKINARI
Application Number:
JP2017193002A
Publication Date:
April 25, 2019
Filing Date:
October 02, 2017
Export Citation:
Assignee:
UNITIKA LTD
International Classes:
H01F1/057; C08K3/08; C08L77/06; H01F1/055; H01F1/08; H01F7/02
Domestic Patent References:
| JP2007335676A | 2007-12-27 | |||
| JP2013253219A | 2013-12-19 | |||
| JP2013098254A | 2013-05-20 | |||
| JP2003049204A | 2003-02-21 | |||
| JP2015199874A | 2015-11-12 |
Foreign References:
| WO2015182693A1 | 2015-12-03 |