JP2003165904A - Reinforced thermoplastic resin composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a reinforced polyamide resin composition excellent in electroconductivity, and good in heat stability, impact resistance, and surface appearance of a molded article. <P>SOLUTION: This reinforced thermoplastic resin composition is manufacture by adding (B) 3-50 pts.wt. of an agent for providing electroconductivity, and (C) 5-50 pts.wt. of a reinforcing member, to (A) 100 pts.wt. of a thermoplastic resin composition comprising (a) 85-50 wt.% of a polyamide resin, (b) 10-45 wt.% of a composite rubber comprising a polyorganosiloxane rubber component and a polyalkyl (meth)acrylate rubber component, and (c) 5-40 wt.% of an impact resistance improving agent. This composition is used for manufacturing a molded article. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforced thermoplastic resin composition, and more specifically, it retains high conductivity and has heat resistance, impact resistance, surface appearance of molded articles,
The present invention relates to a reinforced polyamide resin composition having excellent fluidity.

[0002]

2. Description of the Related Art In recent years, the development of materials in which conductivity is imparted to a resin has been vigorously developed, and in order to impart conductivity, conductive fillers such as carbon black and Ketjen black and carbon fibers such as carbon fiber are used. A method of adding conductive fibers is used.

According to this method, although the conductivity and heat resistance are certainly improved, the impact resistance is largely lowered and the practicality is deteriorated. As a method for improving the impact resistance, a method in which a conductivity-imparting material and an impact resistance improving material are used in combination has been proposed (JP-A-11-49).
949). However, although the electrical conductivity which is the object of the present invention is maintained, the impact resistance is still insufficient and the practicality is poor.

[0004]

DISCLOSURE OF THE INVENTION The inventors of the present invention maintain the conductivity by using a specific rubber component and a conductivity-imparting material together, and also have heat resistance, impact resistance, surface appearance of a molded article, and fluidity. The present invention has led to the invention of a reinforced thermoplastic resin composition having excellent properties and high practicality.

[0005]

The present invention has the following constitution. That is, (1) (a) polyamide resin 85 to 50% by weight, (b)
Composite rubber 10-45 comprising a polyorganosiloxane rubber component and a polyalkyl (meth) acrylate rubber component
(B) 3 to 50 parts by weight of the conductivity-imparting material, and (C) 5 to 50 parts of the reinforcing material with respect to 100 parts by weight of the resin composition (A) consisting of 5 to 40% by weight of (c) impact modifier. A reinforced thermoplastic resin composition obtained by adding parts by weight. (2) The reinforced thermoplastic resin composition according to (1), wherein the conductivity-imparting material (B) is graphite having an average particle size of 1 to 70 μm. (3) The reinforced thermoplastic resin composition according to (1), wherein the reinforcing material (C) is talc having an average particle size of 0.5 to 10 μm. (4) The surface resistivity of the composition when dry is 10 ¹⁴
Ω or less, The reinforced thermoplastic resin composition according to any one of (1) to (3) above. (5) The thermal deformation temperature of the composition under a load of 0.46 MPa is 180 ° C. or higher, and the above (1) to
(4) The reinforced thermoplastic resin composition according to any one of the above. (6) The reinforced thermoplastic resin composition according to any one of (1) to (5) above, wherein the composition has a notched Izod impact strength at room temperature of 70 J / m or more.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The polyamide resin (A) used in the present invention is a polyamide containing amino acids, lactams, or diamines and dicarboxylic acids as main constituents. Typical examples of the main constituents are 6- Amino acids such as aminocaproic acid, 11-aminoundecanoic acid, 12-aminododecanoic acid and para-aminomethylbenzoic acid,
lactams such as ε-caprolactam and ω-laurolactam, tetramethylenediamine, hexamethylenediamine, 2-methylpentamethylenediamine, nonamethylenediamine, undecamethylenediamine, dodecamethylenediamine, 2,2,4- / 2,4 , 4-trimethylhexamethylenediamine, 5-methylnonamethylenediamine, meta-xylylenediamine, para-xylylenediamine, 1,3-bis (aminomethyl) cyclohexane,
1,4-bis (aminomethyl) cyclohexane, 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexane, bis (4-aminocyclohexyl) methane, bis (3-methyl-4-aminocyclohexyl) methane , Aliphatic, alicyclic and aromatic diamines such as 2,2-bis (4-aminocyclohexyl) propane, bis (aminopropyl) piperazine and aminoethylpiperazine, and adipic acid, suberic acid, azelaic acid, sebacic acid Aliphatic such as dodecanedioic acid, terephthalic acid, isophthalic acid, 2-chloroterephthalic acid, 2-methylterephthalic acid, 5-methylisophthalic acid, 5-sodiumsulfoisophthalic acid, hexahydroterephthalic acid, hexahydroisophthalic acid, Examples thereof include alicyclic and aromatic dicarboxylic acids. In the present invention, the polyamide homopolymers or copolymers derived from these constituents may be used alone or as a mixture of plural kinds.

In the present invention, a polyamide resin having a melting point of 200 ° C. or higher is particularly useful from the viewpoint of excellent heat resistance and strength. Specific examples thereof include polycaproamide (nylon 6), polyhexamethylene adipamide (nylon 66), polycaproamide / polyhexamethylene adipamide copolymer (nylon 6/6).
6), polytetramethylene adipamide (nylon 4
6), polyhexamethylene sebacamide (nylon 61
0), polyhexamethylene dodecamide (nylon 61
2), polyhexamethylene terephthalamide / polycaproamide copolymer (nylon 6T / 6), polyhexamethylene adipamide / polyhexamethylene terephthalamide copolymer (nylon 66 / 6T), polyhexamethylene adipamide / polyhexamethylene Isophthalamide copolymer (nylon 66 / 6I), polyhexamethylene adipamide / polyhexamethylene terephthalamide / polyhexamethylene isophthalamide copolymer (nylon 66 / 6T / 6I), polyhexamethylene terephthalamide / polyhexamethylene isophthalamide copolymer (Nylon 6T / 6I), polyhexamethylene terephthalamide / polydodecane amide copolymer (nylon 6T / 12), polyhexamethylene terephthalamide / poly (2-me Le pentamethylene) terephthalamide copolymer (nylon 6T / M5T), polyxylylene adipamide (nylon XD6), poly nonamethylene terephthalamide (nylon 9T), and the like and mixtures thereof or copolymers.

Particularly preferred polyamide resins are nylon 6, nylon 66, nylon 610, nylon 6/66 copolymer, nylon 6T / 66 copolymer, nylon 6T / 6I copolymer, nylon 6T / 1.
Examples thereof include 2 copolymers and nylon 6T / 6 copolymers, and it is also practically preferable to use these polyamide resins as a mixture depending on the required properties such as impact resistance, moldability and compatibility.

The degree of polymerization of these (a) polyamide resins is not particularly limited, and the relative viscosity measured at 25 ° C. of a solution of 0.25 g of polyamide resin in 25 ml of 98% concentrated sulfuric acid is 1.5 to 5.0. Is preferable, and a polyamide resin in the range of 2.0 to 4.0 is particularly preferable.

The content of the (a) polyamide resin in the (A) resin composition of the present invention is 85 to 50% by weight, preferably 80 to 50% by weight. If it is 85% by weight or more, the impact resistance is lowered, and if it is less than 50% by weight, the heat resistance is lowered, which is not preferable.

The composite rubber (b) comprising the polyorganosiloxane rubber component and the polyalkyl (meth) acrylate rubber component used in the present invention is grafted with at least one vinyl monomer containing at least an epoxy group-containing vinyl monomer. The polyorganosiloxane component having the outermost layer coated with methyl methacrylate and the polyalkyl (meth) acrylate rubber component have an interpenetrating network structure.

The content of the composite rubber (b) comprising the polyorganosiloxane rubber component and the polyalkyl (meth) acrylate rubber component contained in the resin composition (A) of the present invention is 10 to 45% by weight, and preferably Is 15 ~
It is 40% by weight. If it is less than 10% by weight, the conductivity is lowered, so that it is necessary to increase the content of the conductivity-imparting material, but it is not preferable because the fluidity is lowered. If it exceeds 45% by weight, the heat resistance is lowered, so that it is necessary to increase the content of the reinforcing material, but this is not preferable because the fluidity is lowered.

The (c) impact resistance improver used in the present invention is one that improves impact resistance when alloyed with a polyamide resin, and comprises an olefin polymerized elastic material and / or an unsaturated carboxylic acid and / or Part or all of the conjugated diene block portion of the olefin polymer elastomer and / or the conjugated diene-aromatic vinyl hydrocarbon block copolymer obtained by grafting or copolymerizing its derivative or vinyl monomer is hydrogenated. The hydrogenated block copolymer elastomer is preferably used, and the amount of unsaturated carboxylic acid and / or its derivative or vinyl monomer which is graft-reacted or copolymerized is preferably 0.01 to 20% by weight. As the unsaturated carboxylic acid used in the graft reaction or copolymerization, acrylic acid, methacrylic acid, ethacrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid,
Examples thereof include citraconic acid and butenedicarboxylic acid. Examples of the derivatives include alkyl esters, glycidyl esters, esters having a di- or tri-alkoxysilyl group, acid anhydrides or imides, and glycidyl esters, di- or tri-alkoxysilyl group-containing compounds. Saturated carboxylic acid ester,
Acid anhydrides and imides are preferred.

Preferred examples of unsaturated carboxylic acids or their derivatives are maleic acid, fumaric acid, glycidyl acrylate, glycidyl methacrylate, diglycidyl itaconic acid, diglycidyl citraconic acid,
Butenedicarboxylic acid diglycidyl ester, butenedicarboxylic acid monoglycidyl ester, maleic anhydride, itaconic anhydride, citraconic anhydride, maleic imide,
Examples thereof include itaconic acid imide and citraconic acid imide, and glycidyl methacrylate, maleic anhydride, itaconic anhydride, and maleic acid imide are particularly preferably used. Also,
Examples of vinyl monomers include aromatic vinyl compounds such as styrene, vinyl cyanide compounds such as acrylonitrile, vinyl silane compounds such as vinyltrimethoxysilane, and the like. Two or more kinds of monomers may be used in combination. Known methods can be used for the method of grafting these unsaturated carboxylic acids or their derivatives or vinyl monomers. It is also possible to use two or more kinds of these impact resistance improving materials in combination.

Specific examples of such impact modifiers include ethylene / methacrylic acid copolymers and a part or all of the carboxylic acid moieties in these copolymers with sodium, lithium, potassium, zinc and calcium. What was made into a salt, ethylene / ethyl acrylate-g-maleic anhydride copolymer, ("g" represents a graft, the same applies below), ethylene / methyl methacrylate-g-maleic anhydride copolymer, ethylene / Ethyl acrylate-g-maleimide copolymer, ethylene / ethyl acrylate-g-N
-Phenylmaleimide copolymer and partially saponified products of these copolymers, ethylene / glycidyl methacrylate copolymer, ethylene / vinyl acetate / glycidyl methacrylate copolymer, ethylene / methyl methacrylate /
Glycidyl methacrylate copolymer, ethylene / glycidyl acrylate copolymer, ethylene / vinyl acetate / glycidyl acrylate copolymer, ethylene / glycidyl ether copolymer, ethylene / propylene-g-
Maleic anhydride copolymer, ethylene / butene-1-g-
Maleic anhydride copolymer, ethylene / propylene / 1,
4-hexadiene-g-maleic anhydride copolymer, ethylene / propylene / dicyclopentadiene-g-maleic anhydride copolymer, ethylene / propylene / 2,5-norbornadiene-g-maleic anhydride copolymer, ethylene / Propylene-g-N-phenylmaleimide copolymer, ethylene / butene-1-g-N-phenylmaleimide copolymer, hydrogenated styrene / butadiene / styrene-
g-maleic anhydride copolymer, hydrogenated styrene / isoprene / styrene-g-maleic anhydride copolymer, ethylene / propylene-g-glycidyl methacrylate copolymer, ethylene / butene-1-g-glycidyl methacrylate Copolymer, ethylene / propylene / 1,4-hexadiene-g-glycidyl methacrylate copolymer, ethylene / propylene / dicyclopentadiene-g-glycidyl methacrylate copolymer, hydrogenated styrene / butadiene /
Examples thereof include styrene-g-glycidyl methacrylate copolymer. Among these, ethylene-g-methacrylic acid copolymers and those in which some or all of the carboxylic acid moieties in these copolymers are salts with sodium, lithium, potassium, zinc, calcium, ethylene / propylene-g -Maleic anhydride copolymer, ethylene / butene-1-g-maleic anhydride copolymer, hydrogenated styrene / butadiene / styrene-g-maleic anhydride copolymer are preferred, and further ethylene / methacrylic acid copolymer And those in which some or all of the carboxylic acid moieties in these copolymers are salts with sodium, lithium, potassium, zinc, calcium, ethylene / propylene-g-maleic anhydride copolymer, ethylene / butene-1. A -g-maleic anhydride copolymer is preferred.

The content of the impact modifier (c) contained in the resin composition (A) of the present invention is 5 to 40% by weight,
It is preferably 7 to 40% by weight. If it is 5% by weight or less, impact resistance is lowered, and if it is 40% by weight or more, heat resistance and fluidity are lowered, which is not preferable.

Examples of the (B) conductivity-imparting material used in the present invention include carbon fiber, carbon black, carbon nanotube, fibrillar carbon, metal particles, metal fiber, antistatic resin, and the like. Effect, dimensional stability,
Graphite is preferable in terms of excellent surface appearance of the molded product.

The graphite used in the present invention includes so-called natural graphite and artificial graphite, but any graphite can be used. Moreover, you may use these together. The shape of graphite may be scaly, scaly, or earth-like, but scaly or scaly is preferable in terms of heat resistance and dimensional stability.

The average particle size of the graphite used in the present invention is 1 to 70 μm, preferably 3 to 30 μm, and more preferably 5 to 20 μm. This is because if the average particle size is less than 1 μm, it is not preferable because the heat resistance and the dimensional stability are deteriorated, and the work environment is deteriorated due to the scattering of fine powder, which makes manufacturing difficult. Further, if it exceeds 70 μm, the surface appearance of the molded product is deteriorated, which is not preferable.

The average particle size is obtained by cutting out a cross section of the resin composition, imaging it with a transmission electron microscope or an optical microscope, measuring the longest part of 100 randomly selected graphites, and averaging the number. To be

The content of (B) graphite of the present invention is
It is 3 to 50 parts by weight, preferably 3 to 40 parts by weight, based on 100 parts by weight of the resin composition (A). When the amount is less than 3 parts by weight, the conductivity is lowered, so that it is necessary to increase the content of the composite rubber composed of the polyorganosiloxane rubber component and the polyalkyl (meth) acrylate rubber component, but it is not preferable because the heat resistance is largely lowered. If it exceeds 50 parts by weight, impact resistance is lowered and fluidity is lowered, which is not preferable.

As the reinforcing material (C) used in the present invention, known materials generally used as a reinforcing material for resins are used. Examples thereof include glass fibers, carbon fibers, metal fibers such as stainless fibers and aluminum fibers, and silicon oxide fibers. , Ceramic fibers, gypsum fibers, whiskers such as potassium titanate whiskers, zinc oxide whiskers, aluminum borate whiskers, organic fibers such as aromatic polyamide fibers, polyphenylene sulfide fibers, liquid crystal polyester fibers, talc,
Wollastonite, zeolite, sericite, kaolin,
Silica salts such as mica, clay, bentonite, montmorillonite, asbestos and aluminosilicate, alumina, silicon oxide, magnesium oxide, zirconium oxide,
Titanium oxide, iron oxide and other metal oxides, calcium carbonate, magnesium carbonate, zinc carbonate, barium carbonate, dolomite, hydrotalcite and other carbonates, calcium sulfate, barium sulfate and other sulfates, calcium hydroxide,
Magnesium hydroxide Aluminum hydroxide, hydroxides such as basic magnesium carbonate, glass beads, glass flake ceramic beads, boron nitride, aluminum nitride,
Examples include silicon carbonate and graphite. It is also possible to add these reinforcing materials together. Further, these reinforcing materials may be treated with a coupling agent such as an isocyanate compound, an organic silane compound, an organic titanate compound, an organic borane compound or an epoxy compound before use. As the montmorillonite, organic montmorillonite in which interlayer ions are cation-exchanged with an organic ammonium salt may be used.

Among these reinforcing materials, talc is preferable because it is excellent in dimensional stability, heat resistance and surface appearance of the molded product.

The average particle size of talc used in the present invention is 0.
It is 5 to 10 μm, preferably 0.5 to 8 μm. If the average particle size is less than 0.5 μm, the reinforcing effect is small and the heat resistance and dimensional stability are poor. Further, if it exceeds 10 μm, the impact resistance is deteriorated, which is not preferable. The average particle diameter is a number average particle diameter that can be obtained as a 50% conversion value of the particle diameter measured by the laser diffraction method.

The content of (C) talc of the present invention is (A)
It is 5 to 50 parts by weight, preferably 5 to 45 parts by weight, based on 100 parts by weight of the resin composition. If it is less than 5 parts by weight, heat resistance and dimensional stability are insufficient, and if it exceeds 50 parts by weight, impact resistance is insufficient and fluidity is deteriorated.

The reinforced thermoplastic resin composition of the present invention has a surface specific resistance value in an absolutely dry state from the viewpoint of preventing troubles such as electrostatic damage in a molded article obtained by molding the composition and post-processing such as painting. Is preferably 10 ¹⁴ Ω or less. This surface specific resistance value is obtained by measuring the reinforced thermoplastic resin composition of the present invention by the method described in the section of the following examples. High conductivity can be obtained by setting the surface specific resistance value in such a range. In order to achieve such a range, 10 to 45% by weight of (b) a composite rubber composed of a polyorganosiloxane rubber component and a polyalkyl (meth) acrylate rubber component contained in the resin composition, and (A) a resin composition It is obtained by adding 3 to 50 parts by weight of the conductivity-imparting material (B) to 100 parts by weight.

The reinforced thermoplastic resin composition of the present invention preferably has a heat distortion temperature of 180 ° C. or higher under a load of 0.46 MPa from the viewpoint of shape stability in a post-processing process such as metal sputtering. This heat distortion temperature is determined by measuring the reinforced thermoplastic resin composition of the present invention by the method described in the section of Examples below. High heat resistance can be obtained by setting the heat distortion temperature in this range. Moreover, in order to make such a range, it is obtained by adding 5 to 50 parts by weight of the reinforcing material (C) to 100 parts by weight of the resin composition (A).

The notched Izod impact strength of the reinforced thermoplastic resin composition of the present invention at room temperature is preferably 70 J / m or more, more preferably 80 J / m or more. The notched Izod impact strength is determined by the method described in the section of Examples below for the reinforced thermoplastic resin composition of the present invention. High impact resistance can be obtained by setting the notched Izod impact strength in this range. Further, in order to achieve such a range, it is obtained by adding 5 to 30% by weight of the (c) impact resistance improving agent contained in the (A) resin composition.

In the present invention, the fiber-reinforced thermoplastic resin composition may contain other resin components as long as the effects of the present invention are not impaired. Other resin components include polypropylene, polyethylene, ABS resin, polyphenylene ether, polybutylene terephthalate, polyethylene terephthalate, liquid crystal polyester, polyphenylene sulfide, polyacetal, polycarbonate and the like.

In the present invention, the fiber reinforced thermoplastic resin composition contains other components such as an antioxidant and a heat stabilizer (hindered phenol type, hydroquinone type, phosphite type and the like) as long as the effects of the present invention are not impaired. These derivatives, etc.), weathering agents (resorcinol-based, salicylate-based, benzotriazole-based, benzophenone-based, hindered amine-based, etc.), release agents and lubricants (montanic acid and its metal salts, their esters, their half esters, stearyl alcohol, Stearamide, various bisamides, bisurea, polyethylene wax, etc.), pigments (cadmium sulfide, phthalocyanine, carbon black, etc.), dyes (nigrosine, etc.), crystal nucleating agents (silica, kaolin, clay, etc.), plasticizers (p-oxybenzoic acid) Octyl acid, N-butylbenzenesulfone , Etc.), antistatic agents (alkyl sulfate type anionic antistatic agents, quaternary ammonium salt type cationic antistatic agents, nonionic antistatic agents such as polyoxyethylene sorbitan monostearate, betaine amphoteric antistatic agents) Agent, etc.), antistatic resin (polyether amide, polyether ester imide, quaternary ammonium salt group-containing maleimide, sodium polysulfonate, etc.), flame retardant (eg red phosphorus, melamine cyanurate,
Hydroxides such as magnesium hydroxide, aluminum hydroxide, ammonium polyphosphate, brominated polystyrene, brominated polyphenylene ether, brominated polycarbonate, brominated epoxy resin or combinations of these brominated flame retardants with antimony trioxide) , A coloring preventing agent (hypophosphite, etc.) and other polymers may be contained.

Next, a method for obtaining the reinforced thermoplastic resin composition of the present invention will be described. The reinforced thermoplastic resin composition of the present invention can be obtained, for example, by melt-kneading a polyamide resin, a composite rubber composed of a polyorganosiloxane rubber component and a polyalkyl (meth) acrylate rubber component, an impact resistance improving material, and a reinforcing material. it can. Further, other known kneading methods can be adopted. As the treatment method, either a batch method or a continuous method can be adopted, but the continuous method is preferable in terms of productivity. The kneading device may be a single-screw or twin-screw extruder, a kneader, a kneader, or the like, and is not particularly limited, but a twin-screw extruder is preferable in terms of productivity and the like. When using a twin-screw extruder, polyamide resin, polyorganosiloxane rubber component and polyalkyl (meth)
A method of supplying composite rubber consisting of acrylate rubber component, impact resistance improving material, conductivity-imparting material, and reinforcing material to the extruder all at once, or by melt-mixing arbitrary components in advance and removing the remaining components from the extruder side. Examples of the method of supply include, but are not limited to.

The reinforced thermoplastic resin composition of the present invention can be formed by a known method. The method for obtaining a molded article includes, for example, extrusion molding,
Examples thereof include injection molding, injection compression molding, blow molding, press molding, and the like, but are not particularly limited, but injection molding and injection compression molding are preferable from the viewpoint of productivity.

Specific examples of the molded article of the reinforced thermoplastic resin composition of the present invention include OA equipment / power tool housings, electric / electronic parts, office supplies, building material-related parts, furniture parts, bumpers, fuel lids, fenders. Car exterior parts such as chassis covers, wheel covers and the like, and particularly preferably used for car exterior parts.

[0034]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following examples.

The characteristics described in Examples and Comparative Examples were evaluated by the following methods.

(1) Tensile Property Reinforcement A thermoplastic resin composition was molded into ASTM No. 1 dumbbell mold and measured according to ASTM D638.

(2) Bending property reinforced thermoplastic resin composition having a height of 1/4 inch and a width of 1/2
Molded into inch and 5 inch long, ASTM D
It was measured according to 790.

(3) The Izod impact strength-reinforced thermoplastic resin composition was molded into a molded product having a thickness of 1/8 inch and measured according to ASTM D256.

(4) Heat-deformation temperature reinforced thermoplastic resin composition is 1/4 inch in height and 1/2 in width
Molded into a 5 inch long, 5 inch long product with a load of 0.46
Measured according to ASTM D648 at 1/2 inch height in MPa.

(5) Surface resistivity value "ULTRA MEGOHMMETE" manufactured by Toa Denpa Kogyo Co., Ltd.
Using R "model SM-10E, the surface specific resistance value was measured under the condition of an applied voltage of 500 V in the vicinity of the central portion of an injection-molded square plate having a length of 80 mm, a width of 80 mm, and a thickness of 3 mm in an absolutely dry state.

(6) Surface appearance of molded product Visual inspection of an injection-molded square plate having a length of 80 mm, a width of 80 mm, and a thickness of 3 mm was evaluated as ◯ when surface irregularities were slightly conspicuous, and as ⊚ when completely inconspicuous. The materials used are shown below.

(I) Polyamide a: Nylon 6 ("Amilan" CM1017 manufactured by Toray Industries, Inc.) (II) Composite rubber composed of a polyorganosiloxane rubber component and a polyalkyl (meth) acrylate rubber component b: "Metablene" S2001 (Mitsubishi Rayon) (III) Impact resistance improving material c-1: "Himilan" 1706 (manufactured by Mitsui DuPont Polychemical Co., Ltd.) c-2: "N Tuffmer" MH5020 (manufactured by Mitsui Chemicals, Inc.) (IV) Conductivity imparting material B -1: Graphite (BF-5A manufactured by Chuetsu Graphite Co., Ltd.) average particle diameter 5 μm B-2: Graphite (manufactured by Katayama Chemical Co., Ltd.) average particle diameter 200
μm (V) Reinforcing material C-1: Talc (LMS100 manufactured by Fuji Talc) average particle diameter 6 μm C-2: Talc (NK48 manufactured by Fuji Talc) average particle diameter 24 μm.

Example 1 After all materials were dry blended in the proportions shown in Table 1, the materials were fed from the extruder hopper using a twin-screw extruder TEX-30 manufactured by Japan Steel Works, and a cylinder temperature of 260 was used.
℃, screw rotation speed 200rpm, 20k per hour
Melt kneading into pellets was carried out under the condition of a throughput of g. After vacuum-drying the obtained pellets at 80 ° C for 16 hours, a characteristic evaluation molded product is injected under the conditions of a cylinder temperature of 260 ° C and a mold temperature of 80 ° C using an injection molding machine SG75H-MIV manufactured by Sumitomo Heavy Industries, Ltd. Obtained by molding. The characteristics of the molded product are as shown in Table 1, and the surface resistivity of the molded product obtained here is as high as 2 × 10 ¹² Ω and has high heat resistance.
It was found that the material has excellent impact resistance and surface appearance of the molded product.

Examples 2, 3 In Example 2, at the ratios shown in Table 1, a, b, c-
1 and B-1 in Example 3, a, b, c-2, B
-1 was dry-blended and then dry-blended using the same extruder as in Example 1, except that C-1 was side-fed from the main hopper of the extruder in the middle of the extruder. Under the same conditions, melt kneading and pelletization, injection molding, and molded product characteristic evaluation were performed. The results are shown in Table 1. The surface resistivity of the molded product obtained here was 6 × 10 ¹³ Ω in Example 2 and 8 × 10 ¹³ Ω in Example 3, which showed high conductivity and heat resistance. It was found that the material had excellent properties, impact resistance, and surface appearance of the molded product.

Examples 4 and 5 Melt kneading, injection molding, and evaluation of the characteristics of molded articles were carried out in exactly the same manner as in Example 1 except for the blending amounts shown in Table 1. The characteristics of the obtained molded products are summarized in Table 1. It was found that the molded articles obtained here were all excellent in conductivity, heat resistance, impact resistance and surface appearance of the molded article.

Example 6 Melt kneading, injection molding, and evaluation of the characteristics of molded articles were performed in exactly the same manner as in Example 1 except for the compounding amounts shown in Table 1. The characteristics of the obtained molded products are summarized in Table 1. It was found that the molded articles obtained here were all excellent in conductivity, heat resistance, and impact resistance, and the surface appearance of the molded articles was slightly conspicuous.

Comparative Example 1 Melt kneading, injection molding, and evaluation of the characteristics of molded articles were carried out in exactly the same manner as in Example 1 except for the compounding amounts shown in Table 1. The results are shown in Table 1, and the molded product obtained here has good conductivity, heat resistance, and surface appearance of the molded product, but inferior impact resistance.

Comparative Examples 2 to 4 Melt kneading, injection molding, and evaluation of the characteristics of molded products were performed in exactly the same manner as in Example 1 except for the compounding amounts shown in Table 1. The characteristics of the obtained molded product are summarized in Table 1, and the molded product obtained here is inferior in conductivity in Comparative Example 2, inferior in heat resistance in Comparative Example 3, and in Comparative Example 4. Has poor conductivity.

[0049]

[Table 1]

[0050]

INDUSTRIAL APPLICABILITY The present invention can provide a reinforced thermoplastic resin composition which retains high conductivity, and has good heat resistance, impact resistance, and surface appearance of a molded product, and a molded product thereof.

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Claims (6)

[Claims] 1. (a) 85 to 50% by weight of polyamide resin,
(B) Composite rubber 10 comprising a polyorganosiloxane rubber component and a polyalkyl (meth) acrylate rubber component 10
45% by weight, (c) 3 to 50 parts by weight of (B) conductivity imparting material, and (C) reinforcing material 5 to 100 parts by weight of (A) resin composition consisting of 5 to 40% by weight of impact modifier. A reinforced thermoplastic resin composition obtained by adding 50 parts by weight. 2. The (B) conductivity-imparting material has an average particle size of 1 to 70.
The reinforced thermoplastic resin composition according to claim 1, wherein the reinforced thermoplastic resin composition is graphite having a diameter of μm. 3. The reinforcing material (C) has an average particle size of 0.5 to 10 μm.
The reinforced thermoplastic resin composition according to claim 1, wherein the reinforced thermoplastic resin composition is talc. 4. The reinforced thermoplastic resin composition according to any one of claims 1 to 3, wherein the surface resistivity of the composition when dried is 10 ¹⁴ Ω or less. 5. The heat distortion temperature of the composition under a load of 0.46 MPa is 180 ° C. or higher.
The reinforced thermoplastic resin composition according to any one of to 4. 6. The reinforced thermoplastic resin composition according to claim 1, wherein the composition has a notched Izod impact strength of 70 J / m or more at room temperature.