JPS63277262A - Plastic magnet composition - Google Patents

Abstract

PURPOSE:To obtain a plastic magnet composition having excellent thermal and mechanical characteristics and low mold shrinkage and linear expansion coefficient, etc., by adding a specific amount o a powdery magnet to an aromatic polyester having a specific structure. CONSTITUTION:The objective composition can be produced by compounding (A) 100pts.wt. of an aromatic polyester composed of (A1) 40-70mol.% of a unit of formula I (X is H, 1-4C alkyl, etc.), (A2) 1-8mol.%. of a unit of formula II (Y is -O-, etc.), (A3) 6-36mol.% of a unit of formula III and IV, (A4) 10-40mol.% of a unit of formula V and (A5) 0.1-10mol.% of a unit of formula VI (Z1 is -NH-; Z2 is -NH-, -O-, etc.) wherein the molar ratio of (unit III)/(unit III + unit IV) is 0.1-0.8 with (B) 100-1,900pts.wt., preferably 400-1,150pts.wt. of a powdery magnet (e.g. ferrite magnet powder) having a particle diameter of 0.1-100mum.

Description

Detailed Description of the Invention [Technical Field] The present invention relates to a plastic magnet composition, and particularly relates to a composition having excellent thermal and mechanical properties, low molding shrinkage, low coefficient of linear expansion, flame retardancy, and good moldability. relating to things.

<Prior art and its problems> Although the magnetic properties of plastic magnets are inferior to those of FS magnets, plastic magnets can be easily obtained into final products by injection molding, are lightweight and can be made into complex shapes, and are available in a large number of products. It has the advantage of being able to be made individually.

Epoxy resins and polyamides (6-nylon, 66 nylon) are often used as binder resins for plastic magnets.

The plastic magnet composition is determined by the resin used as a binder, mechanical strength, heat resistance, etc.
In particular, when heat-resistant epoxy resin is used, the heat distortion temperature is 100 to 120°C, and when nylon is used, it is 140 to 160°C.
It is.

In order to expand the use of plastic magnet compositions in the future, it will be important to improve their heat resistance, but generally speaking, if a resin with high heat resistance is used, the moldability will be poor. The actual situation was that complex molding and multi-piece molding were no longer possible.

<Objective of the Invention> The first object of the present invention is to improve the above-mentioned drawbacks of the prior art, and to achieve high heat resistance, high strength, and high moldability despite low melting temperature and melt viscosity. By using specific aromatic polyesters and aromatic polyesteramides having elastic modulus as binder resins, we aim to provide a plastic magnet composition with excellent moldability, high heat resistance, high strength, and high elastic modulus. .

<Structure of the invention> The first aspect of the present invention is 1.11, III below.

Consisting essentially of each unit represented by the formulas 1v and V, V-0-Ar-0- (wherein, X is H, an alkyl group of c1 to C4,
1 to C4 alkoxy group, 06 to C10 aryl group, or halogen, and 10-Ar-0- in the formula is a symmetrical dioxy unit having at least one monocyclic or condensed aromatic ring. and Y is -〇- or -C-).

Unit I: 40 to 70 mol% Unit II: 1 to 8 mol% Unit: 6 to 36 mol% Unit V: 10 to 40 mol%, and unit III/(molar ratio of unit III to decimal unit) Provided is a plastic magnet composition characterized in that it contains 100 to 1900 Ii parts of a powdered magnetic material per 100 parts by weight of an aromatic polyester having a polyester of 0.1 to 0.8.

The second aspect of the present invention is the following
, v and ■, consisting essentially of units represented by the formulas V-0-Ar-0- (wherein, X is H, a C1-C4 alkyl group, 0
1 to C4 alkoxy group, C6 to C10 aryl group, or halogen, and 10-Ar-0- in the formula is a symmetrical dioxy unit having at least one monocyclic or condensed aromatic ring. , Y is -〇- or , and Zl and 22 are in the rose or meta position of each other. ) Unit 1 40 to 70 mol% Unit II, 1 to 8 mol% unit ■ Tenth wheel ■
6 to 36 mol% Vehicle position v io to 40 mol% Unit ■ 0.1 to 10 mol%, and an aromatic polyester amide having a molar ratio of unit IIN/(unit i11 + unit + v) of 0.1 to 0.8. Provided is a plastic magnet composition characterized in that it contains 100 to 1900 parts by weight of a powdered 611 substance per 100 parts by weight.

The present invention will be explained in detail below.

First, the aromatic polyester and aromatic polyester amide used in the compositions of the first and second aspects of the present invention will be explained, and then the powdered magnetic material will be described.

The aromatic polyester used in the composition of the first aspect of the invention is substantially composed of the following units (I) to (V).

(1) p-hydroxybenzoic acid at jl'-position (I) is
It may be p-hydroxybenzoic acid whose benzene nucleus is substituted with 01-C4-alkyl, C1-C4 alkoxy, C6-C10-aryl, or halogen (preferably chlorine, bromine). Preferably, unsubstituted p-hydroxybenzoic acid, and ester-forming derivatives thereof such as acetate, propionate, benzoate, methyl, ethyl, and phenyl are representative examples.

Unit (I) is about 40-70 mol%, preferably about 45-70 mol%
The content is preferably 65 mol%.

When the content of the 1st position (I) is less than 40 mol% and more than 70 mol%, the mechanical strength of the resulting polyester decreases.

(2)! # (Natsuri is an isophthaloyl moiety represented by the following formula (II-i) and/or the following formula (II
-if) is the m-hydroxybenzoic acid moiety.

The benzene nucleus of (o-i) and (o-4i) is 0
1-C4-alkyl, C1-C4-alkoxy, C6-
It may be substituted with C10-aryl or halogen (preferably chlorine, bromine).

The unit (II-i) is an isophthaloyl moiety, and representative examples include isophthalic acid and/or methyl, ethyl, and phenyl mono- or diester derivatives of isophthalic acid.

-QL(n (II-ii) is a m-hydroxybenzoic acid moiety, and representative examples include m-hydroxybenzoic acid and/or its acetate, propionate, benzoate, methyl, ethyl, and phenyl mono- or diester derivatives. Can be done.

The unit (II) represented by (II-i) and/or (Summer I-ii) is about 1 to 8 mol%, preferably 2 to 5 mol%.
expressed as mol%.

If the unit (I) is less than 1 mol%, the flow temperature of the polyester will become high and it will be difficult to mold, and the unit (+!) will be 8%.
If it exceeds this value, the heat resistance of the polyester will decrease.

(3) Units (III) and (IV) are typically terephthalic acid and 2,6-naphthalene dicarboxylic acid, and their methyl, ethyl, and phenyl mono- or diester derivatives.

The number 1 (Ill) thousand units (IV) is 6 to 36 mol%, preferably 12 to 27 mol%.

Molar ratio of unit (III) and unit (IV) [(III)
/((+i+) + HV) ) ] is 0.1 to 0.8
, preferably about 0.3 to 0.7°. The molar ratio is 0.
If it is less than 1, the flow temperature of the polyester will be high and it will be difficult to mold, and the heat resistance will be low.If it is more than 0.8, the flow temperature will be high and it will be difficult to mold.

When the unit (III) thousand units (rv) is less than 6 mol%, the flow temperature of the polyester becomes high and molding becomes difficult, and when the unit (III) thousand units (rv) exceeds 36 mol%, the aromatic polyester It becomes discolored and loses its mechanical strength.

(4) Unit (V) is a symmetric dihydroxy compound,
It is represented by HO-Ar-OH, where Ar means a divalent group consisting of at least one aromatic ring. Unit (V) is 10~
It is contained in an amount of 40 mol%, preferably 17.5 to 27.5 mol%.

Examples of the symmetrical dihydroxy aromatic compound include those that form the following units in the copolyester.

10 beni and 0 beni and 0- In particular, hydroquinone, bisphenol A14.4'-dihydroxybiphenyl, dihydroxybiphenyl ether, 2,6-dihydroxynaphthalene, etc., or mono- or diester derivatives thereof such as acetate, propionate, benzoate, etc. There is. Particularly preferred compounds are 4,4'-dihydroxybiphenyl, 2,6-
It is hydroxynaphthalene.

If the unit (V) is less than 10 mol%, the flow temperature of the polyester will be high and it will be difficult to mold, and if the unit (V) is less than 40 mol%
If it exceeds mol%, the heat resistance of the polyester decreases, which is not preferable.

The polymerization method is not particularly limited, and any polymerization method may be used as long as the units (I) to (V) are present in the aromatic polyester in the composition ratio of the present invention.

[2] Next, each unit (I) substantially constituting the aromatic polyesteramide used in the composition of the second aspect of the present invention
~(Vl) will be explained.

The aromatic polyester amide has a unit (Vl) described below in addition to the units (I) to (V) of the above-mentioned aromatic polyester.

The unit (■) is a unit having an anilino group (phenylamino group), and is represented by the following formula, Zl is -NH-, and Z2 and -22 are located at the rose position or the meta position with respect to each other.

The unit (Vl) should be present in an amount of 0.1 to 10 mol% based on the total number of moles of units (I) to (Vl),
If it is less than 0.1 mol%, the relaxation of anisotropy due to the introduction of an amide group, which is a feature of the present invention, will not be "-min", and
If 10 mol% is added, the melting temperature and melt viscosity will increase, resulting in poor moldability and a decrease in heat resistance and mechanical strength. The preferred amount of units (Vl) present is 1 to 8 mol%.

The aromatic polyesteramide used in the present invention alleviates anisotropy without impairing the properties of the aromatic polyester described above, and has high strength in the direction perpendicular to the orientation direction (TD direction) during melt processing and molding.

[3] The powdery magnetic material used in the present invention is not particularly limited, but may be MOFe20s (here, M is Ba, Sr, Ca,
Mg, Mn% Fe, Cu.

Ferrite (Ni, Co, Zn, Pb) magnetic powder or RCO, (R is a rare earth element such as Sm, Pr, Ce, La), Sm2 X17 (X is Co, Fe,
Examples include rare earth magnetic powders such as Cu, Zr, Ti%Hf)NdFeB, and these may be used alone or in a mixture of two or more.

The preferred particle size of the magnetic powder used in the present invention is not particularly limited, but is preferably about 0.1 to 100 μm, more preferably about 1 to 50 μm.

If the particle size is 0.1 μm or less, the particles tend to aggregate and the magnetic powder cannot be uniformly dispersed in the composition.
If it exceeds μm, the surface smoothness will be lost, the appearance will be poor, and furthermore, molding will become extremely difficult.

The content of the 6u powder is 100 to 1900 parts by weight, preferably 400 to 115 parts by weight, based on 100 parts by weight of the binder resin.
0 parts by weight is preferable.

If it is less than 100 parts by weight, the magnetic properties of the molded product will be significantly reduced and it will no longer function as a magnet.

Moreover, if it exceeds 1,900 parts by weight, the fluidity during melting deteriorates, making molding extremely difficult, and the mechanical strength of the molded product decreases.8 The magnetic powder used in the present invention may be surface-treated. Examples of the surface treatment agent include silane coupling agents, titanate coupling agents, borane coupling agents, higher fatty acids, and wetting agents such as surfactants. These surface treatment agents may be adsorbed onto the surface of the magnetic powder before kneading the resin and magnetic powder, or may be supplied into a kneading device together with the resin and magnetic powder during kneading.

Examples of devices for kneading these magnetic powders into the resin include an axle extruder, a twin-screw extruder, a kneader, a Banbury mixer-12 roll mill, and a Braventer.

It is also possible to add and mix magnetic powder to the resin melted in a reaction vessel, or to mold the resin and magnetic powder while mixing them in a molding machine.

The compositions of the first and second aspects of the present invention may contain other components other than the above-mentioned essential components [1], [2], and [3] as long as the object of the present invention is not impaired. good.

In addition, the resin components include [1 aromatic polyester and [2
] may be a copolymer or a mixture with an aromatic polyester amide.

In the composition of the present invention, other resins, antioxidants; color inhibitors;
Stabilizers; ultraviolet absorbers; plasticizers; lubricants such as molybdenum disulfide, silicone oil, fluorine resins, and graphite; flame retardants such as tetrabromobisphenol A and antimony trioxide may be blended.

<Example> This will be explained in more detail below using Examples.

First, the test method will be explained.

(1) Preparation of test material Using a φ20 m/m axle extruder (manufactured by Thermo Plastics Industries), resin and inorganic material were melt-kneaded in a predetermined ratio and pelletized.

The obtained pellet is molded into an injection molding machine (newly manufactured by Yamaguchi Seiki 5A).
V-60-52), the mold temperature was 120° C., the injection pressure was 250 Kg/cnf, and the cylinder temperature was set to a temperature at which the resin was completely filled into the mold.

(2) Injection molding temperature The cylinder temperature during injection molding described above was taken as the injection molding temperature, and it was evaluated that the lower this temperature was, the better the moldability was.

(3) Bending test A rod-shaped body measuring 1/2 x 5 x 1/4 was molded using an injection molding machine, and measured in accordance with ASTM-D790.

(4) Heat distortion temperature 18.6Kg/ct according to ASTM D648
Measured at rl.

(5) Magnetic properties A test piece with a diameter of 1 inch and a thickness of 1/2 inch was prepared from the molded sample, and its residual magnetic flux density Br, coercive force He and the maximum energy product (BH) max were measured.

[1] Next, Examples and Comparative Examples of the aromatic polyester composition of the first aspect of the present invention will be described.

(Example 1) Argon introduction tube, stirring device with tachometer/torque meter,
In a 5J2 glass reaction vessel equipped with a thermometer were added 6.66 moles (1200 g) of P-acetoxybenzoic acid, 0.334 moles (55.4 g) of isophthalic acid, and 0.4 moles of terephthalic acid.
After adding 778 mol (129 g), 1112 mol (240 g) of 2.6-naphthalene dicarboxylic acid, and 2,622 mol (soog) of 4.4'-diacetoxybiphenyl, and replacing the air with argon, the internal temperature was raised to 250°C in about 30 minutes. Once the mixture rose and the raw materials were melted, stirring was started.

After the acetic acid started to distill, the temperature was raised to 280°C over 10 minutes, the reaction was continued at this temperature for 30 minutes, and the temperature was increased to 300°C over another 10 minutes.
The temperature was raised to .degree. C., and the reaction was carried out at this temperature for 30 minutes.

Next, the temperature was raised to 310° C. over 10 minutes, and then the pressure was gradually reduced to 1 mmHg over about 20 minutes, and polymerization was continued under these conditions.

The reaction was terminated when a predetermined torque was reached at a predetermined stirring rotation speed.

After solidifying the polymer obtained in this way, it was pulverized and Ba
Type ferrite TR-M (manufactured by Tone Sangyo Co., Ltd.) and resin:
After kneading at a weight ratio of ferrite of 1:9, the mixture was formed into pellets and injection molded.

Table 1 shows the measurement results of the physical properties of the molded product.

(Example 2) P-acetoxybenzoic acid 4.44 mol (aoog), isophthalic acid 0.334 mol (55
, 4 g), 1.5 mol (248.7 g) of terephthalic acid
, 2. 1.5 mol of 6-naphthalene dicarboxylic acid (32
3.7g), 4.4”-diacetoxybiphenyl 3
．． Example 1 except that 33 mol (900 g) was used as the raw material.
An aromatic polyester was synthesized in the same manner as in Example 1, and the same Ba-based ferrite used in Example 1 was mixed, kneaded, adjusted, and evaluated in the same proportion as in Example 1. .

The results are shown in Table 1.

(Example 3) P-acetoxybenzoic acid 7.215 mol (1300
g), isophthalic acid 0.334 mol (55.4 g)
, 0.806 mol (133.8 g) of terephthalic acid,
2. 6-naphthalene dicarboxylic acid o, aoa mole (1
74g), 4.4'-diacetoxybiphenyl 0.94
An aromatic polyester was synthesized in the same manner as in Example 1, except that 3 mol (52 sg) was used as the raw material, and the obtained aromatic polyester was added to the Ba used in Example 1.
The ferrites were mixed, kneaded, adjusted, and evaluated for physical properties using the same method and proportions.

The results are shown in Table 1.

(Example 4) P-acetoxybenzoic acid 7.215 mol (1300
g), 0161 mol (59.9 g) of isophthalic acid,
0.409 mol (67.9 g) of terephthalic acid, 2.
6-naphthalene dicarboxylic acid 1.635 mol (353,
2g), 4. 4-diacetoxybiphenyl 2.40
Aromatic polyester was synthesized in the same manner as in Example 1 except that 5 mol (649.4 g) was used as the raw material.
The obtained aromatic polyester was mixed, kneaded, adjusted, and evaluated with the Ba-based ferrite used in Example 1 in the same manner and proportions.

The results are shown in Table 1.

(Example 5) P-acetoxybenzoic acid 7.215 mol (1300
g), isophthalic acid 0.381 mol (59.9 g)
, terephthalic acid 1.323 mol (219.6 g>
, 2. 0.722 mol (156 g) of 6-naphthalene dicarboxylic acid, 4.4-diacetoxybiphenyl 2.
An aromatic polyester was synthesized in the same manner as in Example 1, except that 405 mol (649.4 g) was used as the raw material, and the same Ba-based ferrite used in Example 1 was added to the obtained aromatic polyester. Mixing, kneading, by method and proportion
Adjustment and physical property evaluation were performed.

The results are shown in Table 1.

(Examples 6 to 8) Examples 1 to 3 were added to the polyester synthesized in Examples 1 to 3.
Using the same Ba-based ferrite as used in 3 =
Mixing, kneading, preparation, and evaluation were performed at a ratio of 17.

The results are shown in Table 1.

(Comparative Example 1) Nylon-6, A1022LP (Bukkake Kaseihin Kogyo Co., Ltd.)
Example 1 with a weight ratio of 1:9 of Ba-based ferrite and Ba-based ferrite
After kneading in the same manner as in Example 1, it was made into pellets, and after injection molding in the same manner as in Example 1, the physical properties were measured.

The results are shown in Table 1.

(Comparative Example 2.3) As a comparative example, a polyester having the composition shown in Table 1 was synthesized, and the same Ba-based ferrite was mixed, kneaded, adjusted, and evaluated in the same manner and proportions as in Example 1.

The results are shown in Table 1.

(Comparative Examples 4 to 6) The polymer used in Comparative Example 1.2.3 and Comparative Example 1.2
．． The same Ba-based ferrite used in Example 3 was mixed, kneaded, adjusted, and evaluated in the same manner at a ratio of 3:17.

The results are shown in Table 1.

Table 1 Resin i11 composition Note (Example 9) Aromatic polyester was obtained by polymerizing in the same manner as in Example 1, except that the materials charged to the reaction vessel were as follows.
A-type ferrite was mixed and molded, and physical properties were evaluated.

The results are shown in Table 2.

P-acetoxybenzoic acid 6.66 mol (1200 g), m-acetoxybenzoic acid 0.334 mol (60 g), terephthalic acid 1.026 mol (170,
4g), 2. 6-naphthalene dicarboxylic acid 1.02
8 mol (222 g), 4.4'-diacetoxybiphenyl 2.056 mol (555 g) (Example 10) Polymerization was carried out in the same manner as in Example 9 except that the materials charged to the reaction vessel were as follows. Group polyester was obtained, and similarly B
A-type ferrite was mixed and molded, and physical properties were evaluated.

The results are shown in Table 2.

P-acetoxybenzoic acid 4.44 mol (800 g), m
-acetoxybenzoic acid 0.334 mol (Box), terephthalic acid 1.58 mol (262.5 g), 2.6-naphthalene dicarboxylic acid 1.58 mol (342 g), 4.4
'-Diacetoxybiphenyl 3.17 mol (855 g
) (Example 11) An aromatic polyester was obtained by polymerizing in the same manner as in Example 9, except that the materials charged into the reaction vessel were as follows.
A-type ferrite was mixed and molded, and physical properties were evaluated.

The results are shown in Table 2.

P-acetoxybenzoic acid 7.215 mol (1300 g)
m-acetoxybenzoic acid 0.334 mol (Bog), terephthalic acid 0.887 mol (147,4K), 2.
0.889 mol (192 g) of 6-naphthalene dicarboxylic acid
), 4.4'-diacetoxybiphenyl 1.778 mol (4sOg) (Example 12) An aromatic polyester was obtained by polymerization in the same manner as in Example 9, except that the materials charged to the reaction vessel were as follows. , similarly B
A-type ferrite was mixed and molded, and physical properties were evaluated.

The results are shown in Table 2.

P-acetoxybenzoic acid 7.215 mol (1300 g)
m-acetoxybenzoic acid 0.381 mol (65 g), terephthalic acid 0.445 mol (73.9 g), 2,6-naphthalene dicarboxylic acid 1.78 mol (384.5 g),
4.225 mol (6
00.8g> (Example 13) An aromatic polyester was obtained by polymerizing in the same manner as in Example 9, except that the materials charged into the reaction vessel were as follows.
A-type ferrite was mixed and molded, and physical properties were evaluated.

The results are shown in Table 2.

P-acetoxybenzoic acid 7.215 mol (1300 g)
m-acetoxybenzoic acid 0.381 mol ([t5g),
1.503 mol (249.5 g) of terephthalic acid,
2.6-naphthalene dicarboxylic acid 0.722 mol (15
6g), 4.4'-diacetoxybiphenyl 2.22
5 mol (600.8 g) (Examples 14 to 16) Examples 9 to 11 were added to the polyesters synthesized in Examples 9 to 11.
The same Ba-based ferrite used in 11 was used in the same manner as 3.
Mixing, kneading, adjustment, and evaluation were performed at a ratio of =17.

The results are shown in Table 2.

(Comparative Example 7.8) As a comparative example, a polyester having the composition shown in Table 2 was synthesized,
The same Ba-based ferrite was mixed, kneaded, adjusted, and evaluated in the same manner and proportions as in Example 9.

The results are shown in Table 2.

(Comparative Examples 9 to 11) The polymer used in Comparative Example 1.7.8 and Comparative Example 1.7
．． The same Ba-based ferrite used in Example 8 was mixed, kneaded, adjusted, and evaluated using the same method at a ratio of 3=17.

The results are shown in Table 2.

[2] Furthermore, Examples and Comparative Examples will be described regarding the aromatic polyesteramide composition of the second aspect of the present invention.

(Example 17) 1642 g (9.12 moles) of P-acetoxybenzoic acid and 80 g (0.0 , 48 mol), terephthalic acid 186
g (1,12 mol), 346 g (16 mol) of 2,6-naphthalene dicarboxylic acid, 864 g (3,2 mol) of 4,4'-diacetoxybiphenyl, 86 g (0,48 mol) of P-acetamidobenzoic acid. After adding and purging with argon, the temperature of the inner hot water was raised to 250° C. in about 30 minutes, and when the raw materials were melted, stirring was started.

Acetic acid began to distill from around 230°C.

After polymerization was carried out at 260°C for 1 hour, 280°C for 1 hour, and 300°C for 1 hour, the pressure was gradually reduced, and finally at 32°C.
The polymerization proceeded under the conditions of 0° C. and 0.5 mmHH, and was completed when the stirrer reached a predetermined torque. The obtained aromatic polyester amide was crushed to form Ba-based ferrite (
TR-M manufactured by Done Sangyo Co., Ltd.) as resin/ferrite 1-=1
The mixture was melt-kneaded at a ratio of /9 (weight ratio), pelletized, and molded in the same manner as in Example 1.

Table 3 shows the results of this physical property evaluation.

(Example 18) P-acetoxybenzoic acid 1728H (9.5 mol), m
-acetoxybenzoic acid 86.4 g (0.43 mol),
246 g (1,48 mol) of terephthalic acid, 2.6-
320 g (1,48 mol) of naphthalene dicarboxylic acid, 4
．． 4'-diacetoxybiphenyl 583 g (2,
16 mol), 154 g of 4-ace1-xyacetanilide
A resin was synthesized in the same manner as in Example 17, except that (0.8 mol) was charged. The obtained aromatic polyester amide was pulverized, and Ba-based ferrite (TR-M manufactured by Done Sangyo Co., Ltd.) was melt-kneaded at a ratio of resin/ferrite of 1 to -1/9 (weight ratio) to form pellets. It was molded in the same manner as in Example 1.

Table 3 shows the results of this physical property evaluation.

(Example 19) Resin was synthesized, kneaded, and pelletized in the same manner as in Example 17, except that the resin/ferrite ratio was 15/85 (weight ratio). After injection molding, physical properties were evaluated.

The results are shown in Table 3.

(Example 20) Resin was synthesized, kneaded, and pelletized in the same manner as in Example 18, except that the resin/ferrite ratio was 15/85 (weight ratio). After injection molding, physical properties were evaluated.

The results are shown in Table 3.

<Effects of the Invention> The plastic magnet composition of the present invention has higher heat resistance than conventional products and can be easily molded, so that plastic magnets can be widely used in a variety of applications.

Claims (2)

[Claims] (1) Substantially consists of each unit expressed by the following formulas I, II, III, IV, and V, and I ▲There are mathematical formulas, chemical formulas, tables, etc.▼ II ▲There are mathematical formulas, chemical formulas, tables, etc.▼ III ▲There are mathematical formulas, chemical formulas, tables, etc.▼ IV ▲There are mathematical formulas, chemical formulas, tables, etc.▼ V -O-Ar-O- (However, X in the formula is H, an alkyl group of C_1 to C_4, Alkoxy group, C_6 to C_1_0
is an aryl group or halogen, and -O in the formula
-Ar-O- is a symmetrical dioxy unit having at least one monocyclic or fused aromatic ring, and Y is -
O- or ▲There are mathematical formulas, chemical formulas, tables, etc.▼). Unit I: 40 to 70 mol% Unit II: 1 to 8 mol% Unit III+Unit IV: 6 to 36 mol% Unit V: 10 to 40 mol%, and the molar ratio of Unit III/(Unit III+Unit IV) is 0.
1. A plastic magnet composition comprising 100 to 1900 parts by weight of a powdered magnetic material per 100 parts by weight of an aromatic polyester having a molecular weight of 1 to 0.8. (2) It essentially consists of each unit expressed by the following formulas I, II, III, IV, V and VI, and I ▲ includes mathematical formulas, chemical formulas, tables, etc. ▼ II ▲ includes mathematical formulas, chemical formulas, tables, etc. ▼ III ▲There are mathematical formulas, chemical formulas, tables, etc.▼ IV ▲There are mathematical formulas, chemical formulas, tables, etc.▼ V -O-Ar-O- V -O-Ar-O- VI ▲There are mathematical formulas, chemical formulas, tables, etc.▼ (However, X in the formula is H, C_1 to C_4 alkyl group, C_1 to C_4 alkoxy group, C_6 to C_1_0
is an aryl group or halogen, and -O in the formula
-Ar-O- is a symmetrical dioxy unit having at least one monocyclic or fused aromatic ring, and Y is -
O- or ▲There are mathematical formulas, chemical formulas, tables, etc.▼, and Z of unit IV
_1 is -NH-, Z_2 is -NH-, -O- or ▲There are mathematical formulas, chemical formulas, tables, etc.▼, and Z_1 and Z_
2 are located in the para or meta position with respect to each other. ) Unit I 40 to 70 mol% Unit II 1 to 8 mol% Unit III + Unit IV 6 to 36 mol% Unit V 10 to 40 mol% Unit VI 0.1 to 10 mol%, and Unit III/(Unit III + Unit The molar ratio of IV) is 0.
1. A plastic magnet composition comprising 100 to 1900 parts by weight of a powdered magnetic material per 100 parts by weight of an aromatic polyester amide having a molecular weight of 1 to 0.8.