Resin composition for bonded magnet and bonded magnet using the same
AssigneeToda Kogyo Corporation
InventorsShigeru Takaragi, Minoru Ohsugi, Takahiro Araki, Takayoshi Ohara
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Abstract
A resing composition for bonded magnet of the present invention comprises: magnetic particles; and an aromatic polyamide resin comprising an aromatic carboxylic acid and an aliphatic diamine, which has a molar rational of residual end carboxyl groups to residual end amino groups of 0.1 to 1.0 and a solution viscosity of not more than 1.1 dl/g. The resin composition for bonded magnet is excellent inmoldability, and a bonded magnet using such a resing composition is excellent in mechanical strength and heat resistance.
Claims12
A resin composition for bonded magnet, comprising:
- magnetic particles;
- and
- an aromatic polyamide resin comprising an aromatic carboxylic acid and an aliphatic diamine, which has a molar ratio of residual end carboxyl groups to residual end amino groups of 0.1 to 1.0 and a solution viscosity of not more than 1.1 dl/g.
A resin composition for bonded magnet, comprising:
- magnetic particles;
- and
- an aromatic polyamide resin comprising an aromatic carboxylic acid and an aliphatic diamine comprising a linear diamine and a branched diamine, which has a molar ratio of residual end carboxyl groups to residual end amino groups of 0.1 to 1.0 and a solution viscosity of not more than 1.1 dl/g,
- a molar ratio of the linear diamine to the branched diamine being less than 4.0.
A resin composition for bonded magnet, comprising:
- magnetic particles;
- and
- an aromatic polyamide resin comprising an aromatic carboxylic acid and an aliphatic diamine comprising a linear diamine and a branched diamine, which has a molar ratio of residual end carboxyl groups to residual end amino groups of 0.1 to 1.0 and a solution viscosity of not more than 1.1 dl/g,
- a molar ratio of the linear diamine to the branched diamine being less than 4.0, and
- the resin composition having a melt flow rate (MFR) of 70 to 500 g/10 min, and a torque increasing time upon kneading by plastomill of 15 to 60 minutes.
A resin composition for bonded magnet, comprising:
- magnetic particles;
- and
- an aromatic polyamide resin comprising an aromatic carboxylic acid and an aliphatic diamine comprising a linear diamine and a branched diamine, which has a solution viscosity of not more than 1.1 dl/g,
- a molar ratio of the linear diamine to the branched diamine being less than 4.0.
A bonded magnet obtained by molding a resin composition comprising magnetic particles and an aromatic polyamide resin comprising an aromatic carboxylic acid and an aliphatic diamine, which has a molar ratio of residual end carboxyl groups to residual end amino groups of 0.1 to 1.0 and a solution viscosity of not more than 1.1 dl/g, the bonded magnet having an IZOD impact strength of 10 to 20 kJ/m2 and a flexural strength of 100 to 180 MPa.
A bonded magnet obtained by molding a resin composition comprising magnetic particles and an aromatic polyamide resin comprising an aromatic carboxylic acid and an aliphatic diamine comprising a linear diamine and a branched diamine, which has a molar ratio of residual end carboxyl groups to residual end amino groups of 0.1 to 1.0 and a
- solution viscosity of not more than 1.1 dl/g,
- a molar ratio of the linear diamine to the branched diamine beimg less than 4.0, and
- the bonded magnet having an IZOD impact strength of 10 to 20 kJ/m2 and a flexural strength of 100 to 180 MPa.
Dependencies are inferred from the claim text.