JPS62246959A - Antistatic resin composition - Google Patents

Abstract

PURPOSE:To provide the titled compsn. having excellent mechanical strength and dimensional stability, consisting of an injection-moldable resin composed of a polyamide-imide and/or a polyetherimide, specified electrically conductive carbon black, natural scaly graphite and an inorg. filler. CONSTITUTION:35-90wt% injection-moldable resin (A) composed of at least one member selected from the group consisting of polyamide-imides and polyetherimides is blended with 0.5-3.0wt% electrically conductive carbon black (B) having DBP absorption of not lower than 400ml/100g and contg. not more than 200ppm (in total) of Ni and V, 2-18wt% natural scaly graphite (C) having an average particle size of 0.8-1.2mu and 5-40wt% inorg. filler (D) having an average particle size of not larger than 50mu, composed of at least one member selected from the group consisting of talc, mica and carbonates, sulfates, phosphates and silicates of Ca, Mg and Ba in such a proportion that the combined amount of the components B and C is 4-20wt%.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an antistatic resin composition of if polyamideimide or polyetherimide.

<Prior Art> In recent years, injection moldable polyamide-imide or polyetherimide resins have become increasingly useful as materials for injection molding of mechanical parts and the like due to their excellent heat resistance, mechanical strength, and sliding properties.

On the other hand, as a conductive resin composition, a moldable resin composition in which a thermoplastic resin or a thermosetting resin is mixed and kneaded with ordinary carbon black, ordinary graphite, and a non-conductive filler is disclosed in JP-A-59-96142. It is known from the official gazette.

<Problems to be Solved by the Invention> When the technique described in JP-A-59-96142 is applied to polyamideimide or polyethylimide resin, antistatic properties can certainly be obtained.

However, these pine resins, which originally have extremely high melt viscosity and have problems with injection moldability, are made worse by the application of such technology, that is, antistatic, and the dimensional stability is impaired due to forced molding. It also has defects such as a significant loss of mechanical strength.

Therefore, as a result of intensive study on the issue of providing a resin composition that has antistatic properties and also has higher levels of injection molding fluidity, dimensional stability, and mechanical strength than conventional ones, we have developed a special carbon black, certain graphite,
In other words, the inventors have discovered that the object can be achieved by using a relatively small amount of scaly graphite, and have arrived at the present invention.

Means for Solving the Problems> The purpose of this defense is (35 to 90% by weight of an injection moldable resin consisting of one or a mixture of two or more selected from Al polyamideimide and polyetherimide, fblDBP oil absorbing ffica 400 me/L 00g or more and 0.5 to 3.0% by weight of conductive carbon black with a total amount of nickel and vanadium of 200ppm or less, +C1 natural scaly graphite 2 to 18% by weight, (d) calcium, magnesium, barium Contains 5 to 40% by weight of an inorganic filler consisting of one or a mixture of two or more selected from salts, sulfates, phosphates, acid salts, talc, and mica, and contains fb) and icl components. This was achieved by an antistatic and heat-resistant resin composition characterized by a total amount of 4 to 20% ffi.

The injection-moldable resin targeted by the present invention is one or a mixture of two or more heat-resistant resins having any of the following three chemical structural formulas as a main component.

(1) Polyamideimide O However, R represents a functional group selected from the following group (a) to (f).

CH, O Y knee S-1-C-1-C-1a: l~250
CHs Arl, (ll and (c), b:l~1O0OH
HO Ar: (a), (b) and (c) (2) polyetherimide formulas (1) to (3) (Dn o and m are lo to lo
o.

Indicates an integer.

The blending amount of these resins is required to be 35% by weight or more in the resin composition in order to maintain molding fluidity and mechanical strength. On the other hand, in order to impart antistatic properties and dimensional stability by other components of the present invention, the upper limit of the blending amount of the resin is 90-fold.

Next, the conductive carbon black used in the present invention is DB
The P oil absorption basin is 400 m, 17,100 g or more, and the total amount of nickel and vanadium is 200 ppm or less.

The total amount of nickel and vanadium in commonly used conducting force bomb black is usually over 11,000 pI), but in the present invention, it is
It is important to use conductive carbon black with a content of 0 ppm or less, and it is particularly preferable that the vanadium content is in the range of aoppm or less and the nickel content is in the range of 40 ppm or less.

If the total amount exceeds 200 ppm, the dispersibility of carbon black will decrease, and not only will the mechanical strength of the composition decrease, but the antistatic effect will also significantly decrease.

In addition, the surface area of conductive carbon black is also an important basic condition, and if expressed in terms of DBP oil absorption, it is 400 m1/l.
O0g or more is required. The DBP oil absorption herein refers to the oil absorption measured according to the method specified in ASTM-D 2414-79. If the DBP oil absorption of this carbon black is less than 400 ml/100 g, a large amount of carbon black must be added to obtain a composition with sufficient antistatic properties, and this will affect the moldability and mechanical properties of the final composition. This is not preferable because the strength is impaired.

Regarding the conductive carbon black targeted by the present invention, there is no particular restriction on the upper limit of the DBP oil absorption, but for manufacturing reasons, it is usually preferably used that is 750 m6/loOg or less.

The amount of carbon black added must be in the range of 0.5 to 3.0% by weight, and more preferably 0.7 to 2.51% by weight.
Meng% is preferred.

If the amount of the conductive carbon black added is less than 0.5% by weight, it will be difficult to impart antistatic properties within a practical range even when used in combination with the specific graphite targeted by the present invention, which is not preferred. On the other hand, if it exceeds 3.0% by weight, it becomes difficult to maintain sufficient molding fluidity and mechanical strength of the composition, which is not preferable.

Next, the graphite used in the present invention needs to be natural scaly graphite. Graphite as an industrial material is generally divided into artificial graphite, which is made by graphitizing coke, tar, pitch, etc. at high temperatures, and natural graphite. Furthermore, natural graphite is classified into scale graphite and bead graphite depending on the production area. The present inventors have discovered that a particular type of graphite, natural flaky graphite, is particularly coated for the following reason.

(1) Provides higher antistatic effect than artificial graphite and globular graphite.

(2) This is because it has the highest effect of increasing the dispersion of the conductive carbon black applied to the present invention.

Significantly reduces deterioration in moldability and mechanical strength due to the addition of carbon black.

In the present invention, the particle size of the natural flaky graphite is not particularly limited, but it is relatively preferable to have an average particle size of 0.8 to 12 μm as determined by microscopic measurement.

Further, the concentration of the graphite added must be in the range of 2 to 18% by weight. If it is less than 2% by weight, it is difficult not only to obtain the effect of increasing the antistatic property of the graphite itself, but also to sufficiently increase the dispersibility of the conductive carbon black.

On the other hand, if the amount of conductive carbon black exceeds 18% by weight, the graphite itself will provide sufficiently high antistatic properties even if the content is less than 0.5% by weight, but the influence of orientation during injection molding will increase, resulting in dimensional stability of the molded product. This is not preferable because it reduces the quality of the product.

This effect appears, for example, in the form of a larger difference in the linear expansion coefficient of the molded product between the flow direction of the resin composition and the direction perpendicular to the flow, impairing the practical value of precision molded products that require high dimensional accuracy.

Furthermore, the total amount of conductive carbon black and natural scaly graphite targeted by the present invention needs to be in the range of 4 to 20% by weight. When the total amount is less than 4% by weight, if the proportion of carbon black is small, the antistatic property is insufficient, and if the proportion of carbon black is large, even if the antistatic property is sufficient, the graphite If the amount is too small, the dispersibility of the conductive carbon black will be poor, and injection moldability and mechanical strength will be significantly impaired. Moreover, if the total amount exceeds 20% by weight, the adverse effects of orientation during injection molding will increase, and the mechanical strength of the molded product will also decrease significantly, which is not preferable.

Next, as the fourth component of the resin composition of the present invention, one or a mixture of two or more selected from calcium, magnesium, barium carbonate, sulfate, phosphate, malt, talc, and mica. 5 to 40 inorganic fillers
Weight% required. In the resin composition of the present invention, such an inorganic filler is necessary in order to impart high dimensional stability to the injection molded article. In addition, such inorganic fillers have the effect of enhancing the antistatic effect of conductive carbon black and graphite, and are also useful in terms of increasing rigidity and heat resistance. The amount of these inorganic fillers added must be determined appropriately depending on the required performance, but is generally in the range of 5 to 40% by weight.

If it is less than 5% by weight, the dimensional stabilizing effect will be poor, and if it exceeds 40% by weight, it will be difficult to maintain mechanical strength.

Further, the particle size of such an inorganic filler is not particularly limited, but in most cases, an average particle size of 50 μm or less is suitable.

Furthermore, of course, in the resin composition of the present invention, other appropriate fillers and heat stabilizers may be added in addition to the above four components to strengthen, suppress thermal expansion, increase sliding properties, improve heat resistance, etc. It is also possible to provide effects such as increased dimensional stability. The filler that can be added is not particularly limited, but fibrous materials and solid fine powders with excellent heat resistance are effective. As the fiber material, those having excellent heat resistance and durability, such as glass fiber, carbon fiber, steel fiber, brass fiber, and potassium titanate whisker, are used.

Further, as the solid fine powder, colloidal silica, quartz powder, tungsten disulfide, molybdenum disulfide, boron nitride, ferrite powder, magnetite powder, etc. are used. Among these fillers, carbon fibers, steel fibers, and brass fibers have the effect of reducing conductive carbon black and graphite within the addition range of the present invention from the viewpoint of antistatic properties.

In addition, in a small amount, known thermoplastic polymers such as polysulfone, polyethersulfone, polyallylsulfone, polyarylate, polyetheretherketone, and injection moldable polyimide may be added to the resin composition of the present invention. may be used together.

The resin composition of the present invention can be obtained by mixing and kneading the component raw materials described above. Kneading can be carried out in the usual manner, for example, by Bavchi kneading using a Banbury mixer or the like, followed by pulverization, or by tri-blending using a Henschel mixer, followed by continuous kneading and extrusion using an extruder to form pellets, or A method of pulverizing it into irregularly shaped particles can be adopted.

<Example> Next, it will be explained in detail using examples.

The method for measuring isotropy of volume resistivity and coefficient of linear expansion described in Examples and Comparative Examples is as follows.

(1) Volume resistivity A diameter of 40 mm was injection molded using an Ultramegome meter, model 5M-10E, manufactured by Toa Electronics Co., Ltd.
m11, thickness 3wx disc with surface load 5 kg/cll”
1,1) Ill voltage 1000V, atmosphere 23℃, 60
Measured in %RH.

(2) Isotropic film with linear expansion coefficient Cross section from the center of a 3011 square, 3 m thick flat plate injection molded using a gate mold, 3 square in cross section, length 16
A prismatic column No. 111 is cut out in the flow direction of the resin and in a direction perpendicular to the flow. (Create one flat blank test piece) The coefficient of linear expansion in the length direction of this test piece was determined using a thermomechanical analyzer (TMA) manufactured by Rigaku Denki, and the temperature was increased at a heating rate of 10/min.
Measurement is carried out in a measurement temperature range of 30 to 80°C. The isotropy of the coefficient of linear expansion is expressed as the difference between the coefficient of linear expansion of the resin in the flow direction and the coefficient of linear expansion in the direction perpendicular to the flow, and it is determined that the smaller this difference is, the greater the dimensional stability is.

The compositions of Examples 1 to 7 and Comparative Examples 1 to 8 are shown in Table 1, and the physical property measurement results are shown in Table 2. Examples 8 to 19% Comparative Example 9
The compositions of samples 1 to 14 are shown in Table 3, and the measurement results of their physical properties are shown in Table 4.

Example 1 Polyamideimide (PAI) represented by the following chemical structural formula
Powder m/n=70/30 MoJl/ratio 3,5 kg
and DBP oil absorption 480m6/100g, nickel content 15
Conductive carbon black with pI)m and vanadium content soppm (manufactured by Lion Akzo, EC-DJ 600)
0.15kg Natural scale graphite (CP, Nippon Graphite Kogyo f
i) 15 kg and calcium carbonate powder (KSS-100
0, manufactured by Kaneko Mining) 2.4 kg and glass fiber (chopped strand, TN-101, manufactured by Nippon Glass Electric) 2.4
After uniformly mixing 5 kg with a 506 drum tumbler for 10 minutes, a 45 m/mφ twin-screw extruder (PCM-45,
Set the cylinder temperature to 335℃ using M shell [engineering W).
The mixture was kneaded and extruded at a screw rotation speed of 8 Qrpm, and pelletized by hot cutting. 75 TO of the obtained pellets
A volume resistivity test piece (40 m in diameter, 3m disc), No. 1 dumbbell (
ASTM-D-638), flexural modulus measurement test piece (13
0wg x 12.4mm x 3mm), linear expansion coefficient measurement test piece (
3011I
V), tensile strength (TS) and flexural modulus (FM) were measured as strength, and isotropy such as linear expansion (ELE) was measured as a measure of dimensional stability. As shown in Table 1, the molding fluidity of the obtained composition is above practical, and the RV shows an average value of 8XlO'Ω・α, with a variation range (n=50).
7 X l O' ~ 9 X 10' Ω・1, which is sufficiently uniform for practical use, TS800 kg/z", FM 2
2 X I O4kg/QM2, ELEO, 02x l
It exhibited Cr-6/''C, had excellent antistatic properties, and had sufficient strength and dimensional stability as a molding material.

Example 2 In Example 1, compositions were obtained by changing the amount of FAI blended, the amount of calcium carbonate added, and the amount of glass fiber blended as shown in Table 1, and the compositions were tested in the same manner as in Example 1. Display the results -
As shown in Figure 2, it was sufficient as a molding material.

Example 3 In Example 1, FAI was 9.0 kg, graphite was 0,
Same as Example 1 except that the amount of calcium carbonate was changed to 35 kg, 0.5 kg of calcium carbonate was added, and no glass fiber was added.
The results of this test are shown in Table 2.

It had good molding fluidity, and had sufficient antistatic properties, strength, and dimensional stability as a molding material.

Comparative Example 1 When the FAI blending amount was changed to 3.0 kg, calcium carbonate 2.7 kg, and glass fiber 2.65 kg in Example 1, the mixture mixed in a tumbler was transferred to the cylinder of a twin-screw presser. Although the temperature was set as high as 345°C and the pellets were finally formed into pellets by hot cutting, the test piece had poor fluidity during injection molding and could not be molded.

Comparative Example 2 In Example 1, the FAI content was 9.2 kg and the conductive carbon black was 0.5 kg. l Okg, graphite 0.20
Table 2 shows the compositions when the amount of calcium carbonate was changed to 0.5 kg, 0.5 kg of calcium carbonate, and no glass fiber was added.
Since the variation range of RV was large and the ELE was large, the dimensional stability was also poor, and it had little practical value as a molding material.

Example 4 7.0 kg of FAI powder with the following chemical structure and DBP oil absorption 420 mA'/long, = 40p
pm, vanadium content 140 0.2 kg of conductive carbon black, natural scale graphite (C5P, Nippon Graphite Industries), akg, and fine powder of calcium sulfate dihydrate (Gyudon Chemical Co., Ltd.)2. After uniformly mixing 0 kg with a 501 drum tumbler for 10 minutes, kneading, extrusion, molding, and evaluation were performed under the same conditions as in Example 1.

As shown in Table 2, the obtained composition had excellent antistatic properties, high strength level and dimensional stability, and was of high practical value.

Comparative Example 3 Test pieces were kneaded and extruded in the same manner as in Example 4, except that the DBP oil absorption of the conductive carbon black was changed by 350 ml/100 gK, and each test piece was molded and measured. As shown in Table 2, the results showed that although the antistatic property was somewhat observed, it varied widely and was unsatisfactory for practical use.

AF History Example 4 Tests were carried out in the same manner as in Example 4, except that the total amount of nickel and vanadium in the conductive carbon black was changed to 300 ppm. As the results are shown in Table 2, the dispersibility of carbon black was poor, so the molding fluidity was poor, the volume resistivity varied widely, and the dimensional stability was low.

Example 5 In Example 1, the amount of PAI added was 8.0 kg, the amount of conductive carbon black added was 0.05 kg, and the amount of graphite was L.
2.4 kg of calcium carbonate and talc (MST)
(manufactured by Takehara Chemical) 0.95kg, without glass fiber additives,
The test was carried out in the same manner as in Example 1 except that each was changed. The evaluation results are shown in Table-2. Although the antistatic property was somewhat low, it was within the practical range due to little variation, and the strength level and dimensional stability were sufficient.

Example 6 In Example 5, conductive carbon black was added to 0, 30
The test was conducted in the same manner as in Example 5, except that the amount of talc was changed to 0.70 kg. As shown in Table-2,
The obtained composition had excellent antistatic properties and dimensional stability, and had no practical problems in molding fluidity and strength.

Comparative Example 6 In Example 5, the amount of conductive carbon black added was 0.
35 kg, 135 kg of graphite, 6 kg of talc
A test was carried out in the same manner as in Example 5 except that the following values were changed. As a result, the molding fluidity was poor and the strength was extremely low.

Example 7 In Example 1, the amount of FAI added was 8.0 kg, the amount of conductive carbon black added was 0.10 kg, the amount of graphite added was LO kg, and the amount of calcium carbonate was 2.4 kg.
The test was carried out in the same manner as in Example 1, except that Sugilite Mica 325-HK, Marietta Resources International Co., Ltd. (m) 0.9-, and the amount of glass fiber blended were changed to no additive. As the results are shown in Table 2, moldability, antistatic property,
The strength and dimensional stability were sufficiently satisfactory as a molding material.

Comparative Examples 7 and 8 In Example 7, the type of graphite was changed to natural clay (AP, manufactured by Nippon Graphite Industries) or artificial graphite powder (Nippon Carbon MS).
The test was conducted in the same manner as in Example 7, except that the test piece was changed to a pulverized product of EG-RH tip bar), and the results are shown in Table 2. All of the compositions had low antistatic properties and insufficient dimensional stability as compositions for precision molding in view of the isotropy of linear expansion coefficient.

Example 8 In Example 5, the amount of FAI added was 7.5 kg, the amount of conductive carbon black added was 0.25 kg, the amount of graphite added was (J, 20 kg, and 0.95 kg of talc was added to calcium phosphate (tertiary)). (Gyudon Chemicals) fine powder 2
．． The test was conducted in the same manner as in Example 5, except that the weight was changed to 0.05 kg. As shown in Table 4, the obtained composition was excellent in antistatic properties and dimensional stability, and its molding fluidity and tensile strength were also satisfactory for practical use.

Example 9 In Example 5, the amount of FAI blended was 7.5 kg.

The amount of conductive carbon black added was 0.20 kg, the amount of graphite added was 18 kg, and 0.95 kg of talc was added to 0.50 kg of magnesium carbonate (basic) powder (manufactured by Gyudon Chemical Co., Ltd.).
The test was carried out in the same manner as in Example 5, except that the weight was changed to 1 kg. As shown in Table 4, the obtained composition had an excellent balance of physical properties and was sufficient as a molding material.

Comparative Example 9 The same procedure as in Example 8 was carried out except that the amount of graphite was changed to 0.15 kg and the amount of calcium phosphate (tertiary) was changed to 2.1 kg. This result Table 1-4
As shown in the figure, due to the poor dispersibility of the conductive carbon black, the volume resistivity value varied widely and the dimensional stability was also insufficient.

Comparative Example 1O In Example 9, the amount of conductive carbon black added was 0.
Example 9 was carried out in the same manner as in Example 9, except that the amount of graphite added was changed to 10 kg and 19 kg.

Although the obtained composition had good fluidity, it had low isotropy in linear expansion coefficient, and was therefore unsatisfactory as a molding material.

Example 10 In Example 8, conductive carbon black was added to 0.15
The test was conducted in the same manner as in the example except that the amount of graphite added was changed to 0.25 kg, and the calcium phosphate powder was changed from 2.05 kg to 2.10 kg of barium carbonate powder (manufactured by Gyudon Chemical Co., Ltd.). As shown in Table 4, the obtained composition was satisfactory as a molding material.

Example 11 In Example 1O, the amount of FAI blended was 6.5 kg.

Addition of conductive carbon black, amount (Bl: 0.20k)
The test was carried out in the same manner as in Example 1O, except that the amount of graphite added (q was changed to 18 kg, barium carbonate powder was changed to 2 kg, and 1 kg was changed to 150 kg of powdered magnesium sulfate anhydride (manufactured by Gyudon Chemical). As shown in Table 4, the obtained composition had excellent antistatic properties, and had no problems in strength level and dimensional stability.

Comparative Example 11 In Example IO, the amount of conductive carbon black added (
Bl is 0.050 kg, graphite addition amount (C) is 0.2
The test was carried out in the same manner as in Example 10, except that the weight of barium carbonate powder was changed to 0 kg (CB++[C10, 25 kg) and 2.25 kg. The resulting composition had insufficient antistatic properties as shown in Table 4.

Comparative Example 12 In Example 11, the amount of conductive carbon black added (
0.30 kg of Bl ((Bl+1C12, l kg
) was carried out in the same manner as in Example 11, except that the amount of magnesium sulfate powder was changed to 140 kg. The resulting composition is shown in Table-
As shown in No. 4, although the antistatic property was excellent, the strength level and dimensional stability were also low, making it unsatisfactory as a molding material.

Examples 12 to 16 In Example 5, the conductive carbon black was O,15
kg, the amount of graphite added is 0.65 kg, and the fourth ingredient is Gyudon Chemical J11! Barium phosphate powder (Example 12), Magnesium phosphate (Daiichi) powder (Example 13), Barium phosphate (meth) powder (Example 14)
), calcium silicate powder (Example 15), or magnesium silicate powder (Example 16) was changed to 120 kg, and the test was conducted in the same manner as in Example 5.

As shown in Table 4, all of the obtained compositions had well-balanced physical properties and were sufficient as injection molding materials.

Example 17 In Example 10, the amount of PAi added was 8.7 kg, the amount of graphite added was 0.65 kg, and barium carbonate was 2.1 kg.
Example 10 was carried out in the same manner as in Example 10, except that g was changed to 0.50 kg of calcium carbonate powder. As shown in Table 4, the obtained composition had an excellent balance of physical properties and was satisfactory as a molding material. there were.

Comparative Example 13 A test was carried out in the same manner as in Example 17 except that the PAI was changed to 8.9 kg and the amount of calcium carbonate added was changed to 0.30 kg. As shown in Table 4, the dimensions were It had poor stability and was unsatisfactory as a molding material.

Example 18 In Example 17, the amount of FAI blended was 5.2 kg,
The same procedure as in Example 17 was carried out except that the amount of calcium carbonate added was changed to 4.0 kg.

As shown in Table 4, the obtained composition had sufficient antistatic properties and strength, and was particularly excellent in dimensional stability, making it suitable as a molding material.

Comparative Example L4 In Example 18, the FAI blending amount was set to 4.7 kg,
Tests were conducted in the same manner as in Example 18, except that the amount of calcium carbonate added was changed to 4.5 kg, and as shown in Table 4, the strength level was insufficient as a molding material.

Example 19 Polyetherimide powder having the following chemical structural formula 5゜5
kg and DB? Conductive carbon black with oil absorption of 48 omg/loog, nickel content of 15 ppm, and vanadium content of 50 ppm (manufactured by Lion Akzo, EC-DJ 6)
00) 0.20 kg, natural scaly graphite (CSP, Nippon Graphite Industrial Membrane) LO kg, curcum powder (MST, Takehara Chemical Co., Ltd.) 0.8 kg, and glass fiber (chopped strand,
After uniformly mixing TN-102 (manufactured by Nippon Glass Electric) 2.5V with a 501 drum tumbler for 10 minutes, 3 Q
m/rnφ twin screw extrusion M (PCM-30, manufactured by Ikegai Iron Works)
The mixture was cross-extruded using a cylinder temperature set at 3ffO 0 C and a screw rotation speed of 7 orpm, and pelletized by hot cutting. The obtained pellets were molded using a 75TON injection molding machine (Cycap, manufactured by Sumitomo Heavy Industries): cylinder temperature 365°C, mold temperature 95°C, injection pressure 1050k.
The same test piece as in Example 1 was molded and measured under the conditions of g/csmJ.

OQ Table 4I The obtained composition has well-balanced molding fluidity, antistatic property, strength, and dimensional stability, all of which are maintained at sufficient levels, and it is not eroded as a molding material. there were.

Effects of Komei> The invention makes it possible to reduce the decrease in mechanical strength of polyamideimide and polyetherimide, and to obtain a resin composition that has excellent antistatic properties and excellent dimensional stability. Unlike the case of conventional heat-resistant antistatic resin compositions.

In particular, a composition excellent as a material for precision injection molding can be provided. Therefore, the resin composition of the present invention can be applied to various uses. For example, optical/magnetic application equipment such as VTR, video disc, compact disc, etc.
In sliding parts of A equipment and other general industrial equipment,
It can be used in many fields, including as a molding material for various mechanical parts that require antistatic properties, and in more special applications, as a molding material for paper separation claws in copying machines.

Claims (1)

Scope of Claims: (a) 35 to 90% by weight of an injection moldable resin consisting of one or a mixture of two or more selected from polyamideimide and polyetherimide (b) DBP oil absorption of 400ml/100g or more, and conductive carbon black with a total content of nickel and vanadium of 200 ppm or less, 0.5 to 3.0% by weight (c) natural scaly graphite 2 to 18% by weight (d) carbonates of calcium, magnesium, and barium;
5 to 40% by weight of an inorganic filler consisting of one or a mixture of two or more selected from sulfates, phosphates, acid salts, talc, and mica, and the total amount of components (b) and (c). 4
An antistatic resin composition characterized in that the content thereof is 20% by weight.