Polyamide composition, molded article, manufactured from the composition, and component for fuels

Abstract

Polyamide resin composition comprising a polyamide resin, a PAN carbon fiber, carbon black, a black dye, glass fiber, and a fluidity-enhancing agent, wherein the amount of PAN carbon fiber is 7.5 to 25 wt.% based on the weight of the composition, the amount of carbon black is 0.03 to 0.52 wt.% based on the weight of the composition, the amount of black dye is 0.02 to 0.5 wt.% based on the weight of the composition, the amount of glass fiber is 15 to 60 wt.% based on the weight of the composition, the amount of fluidity-enhancing agent is 0.01 to 5 wt.% based on the weight of the composition, and the polyamide resin comprises at least one polyamide resin selected from the group consisting of polyamide 6, polyamide 66, polyamide 610, polyamide 1010, polyamide 6 / 66, and polyamide 11. Polyamide 12, polyamide 6 / 12 and polyamide 6 / 66 / 12.

Description

Field of the InventionThe present invention relates to a polyamide resin composition and a molded article made from the composition, and a component for fuels requiring laser marking comprising the composition.Prior ArtPolyamide resins have excellent resistance to organic solvents such as gasoline and also have high fluidity upon melting so as to have excellent moldability, and have excellent thermal properties and mechanical properties. Therefore, polyamide resins are widely used as vehicle exterior materials and engine compartment interior members.Components for fuels, such as a fuel cap, which come into contact with both a fuel and a part of a human body are associated with the risk that an electrostatic discharge, which is generated, for example, when opening or closing a cap, can cause ignition. For this reason, for the purpose of suppressing the occurrence of discharge, for example, a composition containing soot having electrical conductivity has been used in components for fuels.On the other hand, components for fuels are frequently printed, and it is required that the components for fuels are suitable for laser marking excellent in cost and productivity.In order to achieve excellent laser marking ability and excellent impact resistance, Japanese Unexamined Patent Publication No. 2011-32320 has proposed a composition comprising carbon black, a carbon fiber, aramid, and a masterbatch of a metal-plated organic fiber. Further, Japanese Patent No. 4889987 has proposed a polyamide resin composition comprising an ethylene-α-olefin copolymer, modified high density polyethylene and carbon black.Patent Document 3 describes a highly rigid and simultaneously tough reinforced polyamide molding composition which has heat distortion temperature values HDT / A (1.8 MPa), measured according to ISO 75, of above 242° C., and HDT / C (8 MPa) of above 150° C. The polyamide molding composition contains, as a polyamide matrix, a mixture of polyamide 66 and a copolyamide and a filler component. The copolyamide is composed of 50 to 80 parts by weight of units derived from terephthalic acid in combination with hexamethylenediamine in a nearly equimolar ratio and 50 to 20 parts by weight of units derived from isophthalic acid in combination with hexamethylenediamine in a nearly equimolar ratio, the parts by weight of these two components together being 100 parts by weight. The filler component contains a mixture of glass fibers and carbon fibers. The weight percentages of polyamide 66, copolyamide, glass fibers and carbon fibers together are 100%. Further, the weight percentages of the polyamide 66 and the copolyamide together are 20 to 60%, the weight ratio of the polyamide 66 to the copolyamide is 50 / 50 to 95 / 5, the weight percentages of the glass fibers and the carbon fibers together are 40 to 80%, and the weight ratio of the glass fibers to the carbon fibers is 80 / 20 to 95 / 5.Patent Document 4 describes a black polyamide resin composition comprising a polyamide resin and coloring agent, wherein nigrosine, aniline black and carbon black are contained as coloring agent. The polyamide resin composition enables the production of molded articles, in particular injection molded articles, which can be fiber-reinforced.PRIOR ART REFERENCESPatent DocumentsPatent Document 1: Japanese Unexamined Patent PublicationPatent Publication No. JP 2011-32320 APatent Document 2: Japanese Patent No. JP 4889987 B2Patent Document 3: US 2007 / 0 123 632 A1Patent Document 4: U.S. Pat. No. 5,804,638 ASUMMARY OF THE INVENTIONProblems to be Solved by the InventionHowever, the composition described in Japanese Unexamined Patent Publication No. 2011-32320 additionally requires a separate step for preparing a master batch. Further, the polyamide resin composition described in Japanese Patent No. 4889987 is not satisfactory in both electric conductivity and laser inscription ability.It is an object of the present invention to provide a polyamide resin composition having both excellent electric conductivity and excellent laser inscription ability.Means for Achieving the ObjectsThe present inventors have conducted extensive and intensive studies. As a result, it was found that a polyamide resin composition containing a PAN carbon fiber, carbon black and a black dye in specific amounts, respectively, in a polyamide resin has excellent electric conductivity and laser inscription ability.More specifically, the present invention includes the following embodiments.The first embodiment is a polyamide resin composition comprising a polyamide resin, a PAN carbon fiber, carbon black, a black dye, a glass fiber and a fluidity improving agent, wherein the amount of the PAN carbon fiber is 7.5 to 25 wt% based on the weight of the composition, the amount of the carbon black is 0.03 to 0.52 wt% based on the weight of the composition, the amount of the black dye is 0.02 to 0.5 wt% based on the weight of the composition, the amount of the glass fiber is 15 to 60 wt% based on the weight of the composition, the amount of the fluidity improving agent is 0.01 to 5 wt% based on the weight of the composition, and the polyamide resin is at least one polyamide resin selected from the group consisting of, consisting of polyamide 6, polyamide 66, polyamide 610, polyamide 1010, polyamide 6 / 66, polyamide 11, polyamide 12, polyamide 6 / 12 and polyamide 6 / 66 / 12.The second embodiment is a molded article made of the above-mentioned polyamide resin composition.The third embodiment is a component for fuels requiring laser marking comprising the above-described polyamide resin composition.Effects of the InventionBy the present invention, there can be provided a polyamide resin composition having both excellent electric conductivity and excellent laser inscription ability.BRIEF DESCRIPTION OF THE DRAWINGS[FIG. 1 ] A view illustrating the method for visually evaluating laser inscription capability.[FIG. 2 ] A view showing the measurement locations of the molded article used for measurement of a dimensional change rate after immersion in the fuel.INVENTIVE EMBODIMENTAs for the amount of the component of the composition, as far as a plurality of materials corresponding to the components are present in the composition, the amount of the components in the composition in the present specification denotes the total amount of the materials present in the composition unless otherwise specified.The polyamide resin composition of the present invention is a polyamide resin composition comprising a polyamide resin, a PAN carbon fiber, carbon black, a black dye, a glass fiber and a fluidity improving agent, wherein the amount of the PAN carbon fiber is 7.5 to 25 wt% based on the weight of the composition, the amount of the carbon black is 0.03 to 0.52 wt% based on the weight of the composition, the amount of the black dye is 0.02 to 0.5 wt% based on the weight of the composition, the amount of the glass fiber is 15 to 60 wt% based on the weight of the composition, the amount of the fluidity improving agent is 0.01 to 5 wt% based on the weight of the composition, and the polyamide resin of at least one polyamide resin, Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide Polyamide.[Polyamide resin]In the present invention, the polyamide resin is at least one polyamide selected from the group consisting of polyamide 6, polyamide 66, polyamide 610, polyamide 1010, polyamide 6 / 66, polyamide 11, polyamide 12, polyamide 6 / 12, and polyamide 6 / 66 / 12, preferably at least one polyamide selected from the group consisting of polyamide 6, polyamide 66, polyamide 6 / 66, polyamide 11, polyamide 12, polyamide 610, and polyamide 1010, and more preferably polyamide 6 and / or polyamide 66, from the viewpoint of moldability.The polyamide resin preferably has a relative viscosity of 1.0 to 6.0 as measured under the conditions in 96% by mass sulfuric acid at a polyamide concentration of 1% by mass at a temperature of 25° C. according to JIS K-6920. When the relative viscosity of the polyamide resin is within the above range, the resulting composition has an appropriate viscosity upon melting, so that the molding of the composition is facilitated, making it possible to impart excellent mechanical properties to the obtained molded article. From the same viewpoint, the relative viscosity of the polyamide resin is more preferably 1.5 to 5.0, more preferably 1.7 to 4.5, and particularly preferably 2.2 to 3.5.From the viewpoint of adhesion in injection welding, it is preferable that the polyamide resin comprises a polyamide resin having an amino group terminal concentration (10 -5 eq / g) greater than a carboxyl group terminal concentration (10 -5 eq / g). It is particularly preferred that the whole polyamide resin is a polyamide resin having an amino group terminal concentration (10 -5 eq / g) greater than a carboxyl group terminal concentration (10 -5 eq / g). Further, it is preferable that the ratio of the concentration of terminal amino groups to the concentration of terminal carboxyl groups is 1.1 or greater, more preferably 1.5 to 40.0.The concentration of terminal amino groups (10 -5 eq / g) can be measured by dissolving a polyamide resin in a phenol / methanol mixed solution and subjecting the resulting solution to titration with 0.05N hydrochloric acid. The carboxyl terminal group concentration (10 -5 eq / g) can be measured by dissolving a polyamide resin in benzyl alcohol and subjecting the resulting solution to titration with 0.05N-sodium hydroxide solution.Terminally modified polyamide is produced by conducting polymerization or copolymerization in the presence of an amine by a known method such as melt polymerization, solution polymerization or solid phase polymerization. Alternatively, terminal modified polyamide is prepared by conducting polymerization and then melt-kneading the resulting polymer in the presence of an amine. Thus, an amine may be added in any phase during the polymerization or in any phase during melt kneading after the polymerization. However, taking the adhesion in the spin welding into consideration, it is preferable to add an amine in a phase during the polymerization.Examples of the amines include monoamines, diamines, triamines, and polyamines. In addition to the amine, a carboxylic acid such as a monocarboxylic acid, a dicarboxylic acid or a tricarboxylic acid may be added, if necessary, in such an amount as to satisfy the above-mentioned requirements for the terminal group concentrations. The amine and the carboxylic acid may be added simultaneously or separately. Further, the amines and carboxylic acids mentioned below may be used singly or in combination.Specific examples of the monoamines added include aliphatic monoamines such as methylamine, ethylamine, propylamine, butylamine, pentylamine, hexylamine, heptylamine, octylamine, 2-ethylhexylamine, nonylamine, decylamine, undecylamine, dodecylamine, tridecylamine, tetradecylamine, pentadecylamine, hexadecylamine, octadecylamine, octadecylenamine, eicosylamine and docosylamine; alicyclic monoamines such as cyclohexylamine and methylcyclohexylamine; aromatic monoamines such as benzylamine and β-phenylmethylamine; symmetrical secondary amines such as N,N-dimethylamine, N,N-diethylamine, N,N-dipropylamine, N,N-dibutylamine, N,N-dihexylamine and N,N-dioctylamine, and mixed secondary amines such as N-methyl-N-ethylamine, N-methyl-N-butylamine, N-methyl-N-dodecylamine, N-methyl-N-octadecylamine, N-ethyl-N-hexadecylamine, N-ethyl-N-octadecylamine, N-propyl-N-hexadecylamine and N-propyl-N-benzylamine. These may be used singly or in combination.Specific examples of the added diamines include aliphatic diamines such as 1,2-ethanediamine, 1,3-propanediamine, 1,4-butanediamine, 1,5-pentadiamine, 1,6-hexadiamine, 1,7-heptatanediamine, 1,8-octanediamine, 1,9-nonanediamine, 1,10-decanediamine, 1,11-undecanediamine, 1,12-dodecanediamine, 1,13-tridecanediamine, 1,14-tetradecanediamine, 1,15-pentadecanediamine, 1,16-hexadecanediamine, 1,17-heptadecanediamine, 1,18-octadecanediamine, 2-methyl-1,5-pentanediamine, 3-methyl-1,5-pentanediamine, 2-methyl-1,8-octanediamine, 2,2,4-trimethyl-1,6-hexanediamine, 2,4,4-trimethyl-1,6-hexanediamine and 5-methyl-1,9-nonanediamine, alicyclic diamines, such as 1,3-bis(aminomethyl)cyclohexane, 1,4-bis(aminomethyl)cyclohexane, bis(4-aminocyclohexyl)methane, 2,2-bis(4-aminocyclohexyl)propane, bis(3-methyl-4-aminocyclohexyl)methane, 2,2-bis(3-methyl-4-aminocyclohexyl)propane, 5-amino-2,2,4-trimethyl-1-cyclopentanemethylamine, 5-amino-1,3,3-trimethylcyclohexanemethylamine, Bis(aminomethyl)norbornan 2,6-bis(aminomethyl)norbornene, 3,8-bis(aminomethyl)tricyclodecane and 4,9-bis(aminomethyl)tricyclodecane, and aromatic diamines such as m-xylylenediamine and p-xylylenediamine. These may be used singly or in combination.Specific examples of added triamines include 1,2,3-triaminopropane, 1,2,3-triamino-2-methylpropane, 1,2,4-triaminobutane, 1,2,3,4-tetraaminobutane, 1,3,5-triaminocyclohexane, 1,2,4-triaminobenzene, 1,2,3-triaminobenzene, 1,2,4-triaminonaphthalene, 2,5,7-triaminonaphthalene, and 2,4,6-triaminopyridine. Specific examples of tetraamines include 1,2,4,5-tetraaminocyclohexane, 1,2,4,5-tetraaminobenzene, 1,2,7,8-tetraaminophthalin and 1,4,5,8-tetraaminonaphthalene. These may be used singly or in combination.The polyamine added may be a compound having a plurality of primary amino groups (-NH 2) and / or secondary amino groups (-NH-), and examples of polyamines include polyalkyleneimine, polyalkylene polyamine, polyvinylamine and polyallylamine. An amino group with an active hydrogen serves as the reaction site of the polyamine.Polyalkyleneimine is produced, for example, by a method in which an alkylenimine such as ethylenimine or polylenimine is subjected to ionic polymerization or a method in which an alkyloxazoline is polymerized and the resulting polymer is then subjected to partial hydrolysis or complete hydrolysis. Examples of polyalkylene polyamines include diethylenetriamine, triethylenetetramine, pentaethylenehexamine, and reaction products of ethylenediamine and a polyfunctional compound. Polyvinylamine is obtained, for example, by polymerizing N-vinylformamide to form poly(N-vinylformamide) and then subjecting the resulting polymer to partial hydrolysis or complete hydrolysis using an acid such as hydrochloric acid. Polyallylamine is generally obtained by polymerizing a hydrochloride of an allylamine monomer and then removing hydrochloric acid from the resulting polymer. These may be used singly or in combination. Of these, polyalkyleneimine is preferred.Examples of polyalkyleneimines include homopolymers and copolymers obtained by polymerizing one or two or more alkyleneimines having 2 to 8 carbon atoms such as ethylenimine, propyleneimine, 1,2-butyleneimine, 2,3-butyleneimine or 1,1-dimethylethyleneimine by a general method. Of these, polyethyleneimine is particularly preferred. The polyalkyleneimine may be any of a branched polyalkyleneimine containing a primary amine, a secondary amine and a tertiary amine obtained by subjecting an alkylenimine as a starting material to ring-opening polymerization, linear polyalkyleneimine containing only a primary amine and a secondary amine obtained by subjecting an alkyloxazoline as a starting material to polymerization, and polyalkyleneimine having a three-dimensional crosslinked structure. Further, the polyalkyleneimines may be those containing, for example, ethylenediamine, propylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, dipropylenetriamine, tripropylenetetramine, dihexamethylenetriamine, aminopropylethylenediamine or bisaminopropylethylenediamine. The polyalkyleneimine generally has a tertiary amino group resulting from reactivity of an active hydrogen atom on the nitrogen atom contained therein, and a primary amino group and a secondary amino group (imino group) each having an active hydrogen atom.There is no particular limitation on the number of nitrogen atoms in the polyalkyleneimine. However, the number of nitrogen atoms in the polyalkyleneimine is preferably 4 to 3,000, more preferably 8 to 1,500, more preferably 11 to 500. Further, the number average molecular weight of the polyalkyleneimine is preferably 100 to 20,000, more preferably 200 to 10,000, more preferably 500 to 8,000.On the other hand, examples of the carboxylic acids added include aliphatic monocarboxylic acids such as acetic acid, propionic acid, butyric acid, valeric acid, caproic acid, enanthic acid, caprylic acid, capric acid, pelargonic acid, undecanoic acid, lauric acid, tridecanoic acid, myristic acid, myristic acid, palmitic acid, stearic acid, oleic acid, linoleic acid, arachidonic acid, behenic acid and erucic acid, alicyclic monocarboxylic acids such as cyclohexanecarboxylic acid and methylcyclohexanecarboxylic acid, aromatic monocarboxylic acids such as benzoic acid, toluylic acid, ethylbenzoic acid and phenylacetic acid, aliphatic dicarboxylic acids such as malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, and the like, Undecanedioic acid, dodecanedioic acid, hexadecanedioic acid, hexadecenedioic acid, octadecanedioic acid, octadecendioic acid, eicosanodiic acid, eicosanedioic acid, diglycolic acid, 2,2,4-trimethyladipic acid and 2,4,4-trimethyladipic acid, alicyclic dicarboxylic acids such as 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid and norbornanedicarboxylic acid, aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, phthalic acid, m-xylylenedicarboxylic acid, p-xylylenedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid and 2,7-naphthalenedicarboxylic acid, and tricarboxylic acids such as 1,2,4-butanetricarboxylic acid, 1,3,5-pentanetricarboxylic acid, 1,2,6-hexanetricarboxylic acid, 1,3,6-hexanetricarboxylic acid, 1,3,5-cyclohexanetricarboxylic acid and trimesic acid. These may be used singly or in combination.The amount of the amine used is appropriately determined by a known method taking into account the concentration of terminal amino groups, the concentration of terminal carboxyl groups and the relative viscosity of the polyamide resin to be produced. From the viewpoint of obtaining satisfactory reactivity and facilitating production of a polyamide resin having a desired viscosity, the amount of the amine added is generally preferably 0.5 to 20 meq / mol, more preferably 1.0 to 10 meq / mol, based on 1 mol of the monomer or the monomer unit constituting the repeating units. (As for the equivalent (eq) of an amino group, one equivalent corresponds to the amount of an amino group which reacts with a carboxyl group in a ratio of 1:1 to form an amide group.)As for the polyamide resin, in order to satisfy the requirements of the concentrations of the terminal groups among the above-mentioned amines, a diamine and / or a polyamine is preferably added in the polymerization, and from the viewpoint of suppressing the occurrence of gelation, at least one member selected from the group consisting of an aliphatic diamine, an alicyclic diamine and a polyamine is more preferably added.Examples of the apparatus for producing a polyamide resin include known apparatuses for producing polyamide, for example, kneading reaction extruders such as a batch-type reaction vessel, a single-chamber or multi-chamber continuous reaction apparatus, a tube continuous reaction apparatus, a single-screw kneading extruder, and a twin-screw kneading extruder. The polymerization can be carried out using a known method as a polymerization method such as melt polymerization, solution polymerization or solid phase polymerization by repeating the operations under atmospheric pressure, under a reduced pressure or under an elevated pressure. These polymerization methods may be used singly or appropriately in combination.[PAN carbon fiber]The PAN carbon fiber is a carbon fiber obtained by carbonizing a polyacrylonitrile fiber.As for the fiber length of the PAN carbon fiber, the PAN carbon fiber may be a short fiber or a continuous fiber having a length up to 1,000 mm depending on the use of the composition. However, from the viewpoint of productivity, for example, feed properties of the composition in a twin-screw kneader, the fiber length of the PAN carbon fiber before being kneaded is preferably 0.1 to 20 nm, more preferably 1 to 15 mm.As for the fiber diameter of the PAN carbon fiber, there is no particular limitation. However, a PAN carbon fiber having a small fiber diameter is likely to provide strength in the resulting resin composition or molded article, while the PAN carbon fiber having too small a fiber diameter is likely to suffer from fiberization of the carbon fiber, for example, when it is supplied to a kneader, which lowers production efficiency in kneading. From the viewpoint of productivity using a kneader and mechanical-physical properties such as strength, a PAN carbon fiber having a fiber diameter of 5 to 15 μm is preferable. A masterbatch prepared in advance by adding a carbon fiber in a high concentration to a resin or granulated carbon fibers are unlikely to suffer from fiberization of the carbon fiber during production of a polyamide resin composition, and therefore a very fine carbon fiber is preferably used.[Carbon Black]The carbon black may be any of furnace carbon black obtained by furnace method, channel carbon black obtained by channel method, acetylene carbon black obtained by acetylene method, and thermal carbon black obtained by thermal or furnace method, but is preferably acetylene carbon black in view of electrical conductivity, and preferably furnace carbon black in view of availability and cost.[Black Dye]Examples of black dyes include nigrosine and aniline black, and any of these can be used to achieve a similar effect, but from the standpoint of cost and moldability, nigrosine is preferred. Examples of commercially available nigrosin products include SPIRIT BLACK SB, SPIRIT BLACK AB, SPIRIT BLACK SA, SPIRIT BLACK SZ; Nigirosin Base EE, Nigrosin Base EX and Nigrosin Base EX-BP manufactured by Orient Chemical Industries, Co., Ltd.[Glass fiber]The polyamide resin composition contains a glass fiber from the viewpoint of improving impact resistance.Considering the feed properties of the composition in a kneader or the like, the glass fiber is preferably sized with a sizing agent.As for the sizing agent, a urethane resin and / or an acrylic resin is preferred from the viewpoint of compatibility with the polyamide resin. From the viewpoint of further improving compatibility with the polyamide resin, an acrylic resin is more preferred.From the viewpoint of improving dispersibility in polyamide resin and adhesion to polyamide resin, the glass fiber is preferably surface-treated with a surface treatment agent. Examples of surface treatment agents include a silane compound, a chromium compound and a titanium compound, and preferred is a surface treatment agent comprising a silane compound and / or a titanium compound.As the surface treatment agent comprising a silane compound, an aminosilane coupling agent having excellent adhesion to the sizing agent is preferred, and examples of such aminosilane coupling agents include γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-phenyl-γ-aminopropyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, N-β-(aminoethyl)-γ-aminopropyltriethoxysilane, γ-aminodithiopropyltrihydroxysilane, γ-(polyethylenamino)propyltrimethoxysilane, N-β-(aminopropyl)-y-aminopropylmethyldimethoxysilane, N-(trimethoxysilylpropyl)-ethylenediamine, and γ-dibutylaminopropyltrimethoxysilane. These may be used singly or in combination.Examples of surface treatment agents comprising a titanium compound include isopropyltriisostearoyl titanate, isopropyltri(N-aminoethyl) titanate, Isopropyltris(dioctylpyrohosphat)titanat Tetraisopropylbis(dioctylphosphit)titanat tetraisopropyl titanate, tetrabutyl titanate, Tetraoctylbis(ditridecylphosphit)titanat isopropyltrioctanoyl titanate, isopropyltridodecylbenzenesulfonyt titanate, isopropyltri(dioctylphosphate) titanate, bis(dioctyl pyrophosphate)ethylene titanate, Isopropyldimethacrylisostearoyltitanat tetra(2,2-diallyloxymethyl-1-butyl)bis(ditridecyl phosphite) titanate, isopropyltricumylphenyl titanate, bis(dioctyl pyrophosphate)oxyacetate titanate, and isopropylisostearoyldiacryl titanate. These may be used singly or in combination.Of these, preferred is at least one member selected from the group consisting of N-β-(aminoethyl)-aminopropyltrimethyldimethoxysilane, N-β-(aminoethyl)-aminopropylmethyldimethoxysilane, and γ-aminopropyltriethoxysilane.As for the glass fiber, a glass fiber having a circular cross section along the direction perpendicular to the longitudinal direction and / or a glass fiber having a non-circular cross section along the direction perpendicular to the longitudinal direction may be used.As for the average fiber diameter of the glass fiber having a circular cross section, there is no particular limitation. However, from the viewpoint of dimensional stability and mechanical properties of the obtained molded article, the average fiber diameter of the glass fiber having a circular cross section is preferably 5 to 25 μm, more preferably 5 to 24 μm, more preferably 6 to 23 μm.The average fiber diameter of the glass fiber having a circular cross section can be measured according to JIS R3420.In the glass fiber having a non-circular cross section along the direction perpendicular to the longitudinal direction, the ratio of the long diameter to the short diameter in the cross section along the direction perpendicular to the longitudinal direction of the fiber is 1.2 to 10. In view of a slight warp and the mechanical properties, the ratio of the long diameter to the short diameter in the cross section along the direction perpendicular to the longitudinal direction of the fiber in the glass fiber having a non-circular cross section is preferably 1.2 to 10, more preferably 1.5 to 6, more preferably 1.7 to 4.5. The long diameter indicates the largest length of the straight line connecting any two points on the cross-sectional contour, and the short diameter indicates the smallest length of a straight line perpendicular to the long diameter connecting the two points on the cross-sectional contour.In the glass fiber having a non-circular cross section, the long diameter is preferably 2 to 100 μm, and the short diameter is preferably 1 to 20 μm.The glass fiber having a non-circular cross section may be one having a predetermined ratio of the long diameter to the short diameter, and generally one having a cross section of a cocoon, ellipse, semicircle, circular arc, rectangle or parallelogram shape or a shape similar thereto is used. In view of fluidity, mechanical properties and slight warp, a glass fiber having a cross section of a cocoon, ellipse or rectangle shape is preferred in practice.[Fluidity Improving Agent]From the viewpoint of improving fluidity, the polyamide resin composition contains a fluidity improving agent.Examples of fluidity improving agents include dicarboxylic acids and polyhydric alcohols, and polyhydric alcohols are preferred from the viewpoint of reactivity with the polyamide resin.Examples of dicarboxylic acids include aliphatic dicarboxylic acids and aromatic dicarboxylic acids, and specific examples include oxalic acid, malonic acid, succinic acid, adipic acid, azelaic acid, sebacic acid, phthalic acid and terephthalic acid.Polyhydric alcohols include not only polyhydric alcohols but also partial ester compounds of a polyhydric alcohol with a fatty acid and partial ester compounds of an alkylene oxide addition product of a polyhydric alcohol with a fatty acid. Specific examples of polyhydric alcohols include ethylene glycol, propylene glycol, 1,3- / 1,4-butanediol, 2-methyl-1,3-propanediol, 1,2- / 1,3- / 1,4- / 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol, 2-ethyl-2-methyl-1,3-propanediol, 1,7-heptanediol, 2-methyl-2-propyl-1,3-propanediol, 2,2-diethyl-1,3-propanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-dicandiol, 1,11-undecanediol, 1,12-dodecanediol, glycerol, diglycerol, triglycerol, tetraglycerol, polyglycerol, trimethylolethane, trimethylolpropane, ditrimethylolpropane, tri(trimethylolpropane), trimethylolbutane, erythritol, pentaerythritol, dipentaerythritol, tripentaerythritol, Polypentaerythritol, 1,2,4-butanetriol, 1,3,5-pentanetriol, 1,2,6-hexanetriol, 1,2,3,4-butanetetraol, sorbitan, isosorbide, sorbitol, adonitol, arabitol, xylitol, mannitol, xylose, arabinose, ribose, rhamnose, glycose, fructose, galactose, mannose, sorbose, cellobiose, maltose, isomaltose, trehalose, sucrose, raffinose, gentamicinose, and melezitose.Among them, from the viewpoint of improving the fluidity, at least one polyhydric alcohol selected from the group consisting of pentaerythritol, polyglycerol, trimethylolethane, trimethylolpropane, dipentaerythritol, sorbitan, and sorbitol is preferred, and particularly preferably at least one polyhydric alcohol selected from the group consisting of pentaerythritol, dipentaerythritol, polyglycerol, trimethylolethane, and trimethylolpropane is preferred. From the viewpoint of suppressing scattering of the composition during kneading or molding and achieving excellent dispersibility, at least one polyhydric alcohol selected from the group consisting of pentaerythritol, polyglycerol, dipentaerythritol, and trimethylolethane is more preferred, and particularly preferably at least one polyhydric alcohol selected from the group consisting of pentaerythritol, dipentaerythritol, and trimethylolethane is more preferred.[Polyamide Resin Composition]The polyamide resin composition contains the PAN carbon fiber in an amount of 7.5 to 25 wt%, the carbon black in an amount of 0.03 to 0.52 wt%, the black dye in an amount of 0.02 to 0.5 wt%, the glass fiber in an amount of 15 to 60 wt%, and the fluidity improving agent in an amount of 0.01 to 5 wt% based on the weight of the composition.The polyamide resin composition contains the PAN carbon fiber in an amount of 7.5 to 25 wt% based on the weight of the composition, and in view of the electric conductivity, preferably in an amount of 8 to 20 wt%, more preferably in an amount of 8 to 15 wt%.From the viewpoint of the electric conductivity, the ratio of the PAN carbon fiber to the polyamide resin is preferably 10.0 to 40.0 wt %, more preferably 12.0 to 25.0 wt %.The polyamide resin composition contains the carbon black in an amount of 0.03 to 0.52 % by weight, preferably in an amount of 0.05 to 0.5 % by weight, based on the weight of the composition, in view of the laser marking ability.From the viewpoint of laser marking ability, the ratio of the carbon black to the polyamide resin is preferably 0.02 to 1.20 wt%, more preferably 0.05 to 1.00 wt%. From the viewpoint of the electric conductivity and the laser marking property, the ratio of the carbon black to the PAN carbon fiber is preferably 0.1 to 2.5 wt %, more preferably 0.6 to 3.5 wt %.The polyamide resin composition contains the black dye in terms of laser marking ability, moldability and impact resistance in an amount of 0.02 to 0.5 % by weight, preferably in an amount of 0.03 to 0.3 % by weight, particularly preferably in an amount of 0.05 to 0.3 % by weight, based on the weight of the composition.From the viewpoints of laser marking ability, moldability and impact resistance, the ratio of the black dye to the polyamide resin is preferably 0.02 to 2.00% by weight, more preferably 0.08 to 0.75% by weight. From the viewpoint of laser marking ability, the ratio of the black dye to the carbon black is preferably 1.5 to 99.0% by weight, more preferably 10.0 to 90.0% by weight.From the viewpoint of impact resistance, the polyamide resin composition contains the glass fiber in an amount of 15 to 60% by weight, preferably in an amount of 25 to 50% by weight, more preferably in an amount of 30 to 45% by weight, based on the weight of the composition.From the viewpoint of impact resistance, the ratio of the glass fiber to the polyamide resin is preferably 20 to 55 wt%, more preferably 35 to 50 wt%.From the viewpoint of improving the fluidity, the polyamide resin composition contains the fluidity improving agent in an amount of 0.01 to 5 % by weight, preferably in an amount of 0.03 to 4 % by weight, more preferably in an amount of 0.05 to 3 % by weight, based on the weight of the composition.From the viewpoint of improving the fluidity, the ratio of the fluidity improving agent to the polyamide resin is preferably 0.02 to 10 % by weight, more preferably 0.08 to 6.0 % by weight.From the viewpoint of mechanical properties, the polyamide resin composition contains the polyamide resin preferably in an amount of 20 to 100 % by weight, more preferably in an amount of 70 to 100 % by weight, more preferably in an amount of 90 to 100 % by weight, based on the weight of the residue obtained by removing the PAN carbon fiber, the carbon black, the black dye, the glass fiber and the fluidity improving agent from the composition.Examples of methods for producing the polyamide resin composition include a dry mixing method using a tumbler or a mixer, a melt kneading method using a single-screw or twin-screw extruder, and a mask batch method in which the resin is preliminarily kneaded in a high concentration into the starting materials using a single-screw or twin-screw extruder and the resultant mixture is diluted before use. From the viewpoint of improving dispersibility, a melt-kneading method is preferred.The polyamide resin composition may contain various additives, modifiers or reinforcing agents which are usually incorporated, for example, a heat stabilizer, an antioxidant, an ultraviolet light absorber, a weathering stabilizer, a filler, a plasticizer, a foaming agent, an antiblocking agent, a tackifier, a sealant property improving agent, an antifogging agent, a releasing agent, a crosslinking agent, a foaming agent, a dispersant, a flame retardant, a colorant (such as a pigment or a dye), an adhesion promoter or an inorganic compound other than glass such as talc in such an amount that the properties of the composition are not sacrificed.Further, in the polyamide resin composition, a thermoplastic resin other than the polyamide resin may be used in such an amount that the properties of the composition are not sacrificed.Examples of thermoplastic resins other than the polyamide resins include polyolefin resins such as high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), ultra high molecular weight polyethylene (UHMWPE), polypropylene (PP), polybutene (PB), polymethylpentene (TPX), an ethylene / propylene copolymer (EPR), an ethylene / butene copolymer (EBR), an ethylene / vinyl acetate copolymer (EVA), an ethylene / acrylic acid copolymer (EAA), an ethylene / methacrylic acid copolymer (EMAA), an ethylene / methyl acrylate copolymer (EMA), an ethylene / methyl methacrylate copolymer (EMMA) and an ethylene / ethyl acrylate copolymer (EE), polystyrene resins such as polystyrene (PS), syndiotactic polystyrene (SPS), a methyl methacrylate / styrene copolymer (MS), a methyl methacrylate / styrene / butadiene copolymer (MBS), a styrene / butadiene copolymer (SBR), a styrene / isoprene copolymer (SIR), a styrene / isoprene / butadiene copolymer (SIBR), a styrene / butadiene / styrene copolymer (SBS), a styrene / isoprene / styrene copolymer (SIS), a styrene / ethylene / butylene / styrene copolymer (SEBS) and a styrene / ethylene / propylene / styrene copolymer (SEPS), the above-mentioned polyolefin resins and polystyrene resins containing a functional group such as a carboxyl group or a salt thereof, an acid anhydride group or an epoxy group; polyester resins such as polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polyethylene isophthalate (PEI), a poly(ethylene terephthalate / ethylene isophthalate) copolymer (PET / PEI), polytrimethylene terephthalate (PTT), polycyclohexanedimethylene terephthalate (PCT), polyethylene naphthalate (PEN), polybutylene naphthalate (PBN), polyacrylate (PAR), liquid crystalline polyester (LCP), polylactic acid (PLA) and polyglycolic acid (PGA); Polyester resins such as polyacetal (POM) and polyphenylene ether (PPO), polysulfone resins such as polysulfone (PSU), polyethylsulfone (PESU) and polyphenylsulfone (PPSU), polythioether resins such as polyphenylene sulfide (PPS) and polythioethersulfone (PTES); polyketone resins such as polyketone (PK), polyetherketone (PEK), polyether ether ketone (PEEK), polyether ketone ketone (PEKK), polyether ether ketone (PEEEEK), polyether ether ketone ketone (PEEKK), polyether ketone ketone ketone ketone (PEKKK) and polyether ketone ether ketone ketone (PEKEKK), polynitrile resins such as polyacrylonitrile (PAN), polymethacrylonitrile, an acrylonitrile / styrene copolymer (AS), a methacrylonitrile / styrene copolymer, an acrylonitrile / butadiene / styrene copolymer (ABS) and an acrylonitrile / butadiene copolymer (NBR), polymethacrylate resins such as polymethyl methacrylate (PMMA) and polyethyl methacrylate (PEMA), polyvinyl resins such as polyvinyl alcohol (PVA), polyvinylidene chloride (PVDC), polyvinyl chloride (PVC), a vinyl chloride / vinylidene chloride copolymer and a vinylidene chloride / methacrylate copolymer, cellulose resins such as cellulose acetate and cellulose butyrate, fluororesins such as polyvinylidene fluoride (PVDF), polyvinyl fluoride (PVF), polytetrafluoroethylene (PTFE), polychlorofluoroethylene (PCTFE), a tetrafluoroethylene / ethylene copolymer (ETFE), an ethylene / chlorotrifluoroethylene copolymer (ECTFE), a tetrafluoroethylene / hexafluoropropylene copolymer (FEP), a tetrafluoroethylene / hexafluoropropylene / vinylidene fluoride copolymer (THV), a tetrafluoroethylene / hexafluoropropylene / vinylidene fluoride / perfluoro (alkyl vinyl ether) copolymer (a tetrafluoroethylene / perfluoro (alkyl vinyl ether) copolymer (PFA), a tetrafluoroethylene / hexafluoropropylene / perfluoro (alkyl vinyl ether) copolymer, and a chlorotrifluoroethylene / perfluoro (alkyl vinyl ether) / tetrafluoroethylene copolymer (CPR), polycarbonate resins such as polycarbonate (PC); Polyimide resins such as thermoplastic polyimide (TPI), polyetherimide, polyesterimide, polyamideimide (PAI), and polyesteramidimide, thermoplastic polyurethane resins, polyamide elastomers, polyurethane elastomers, and polyester elastomers. These may be used singly or in combination.The polyamide resin composition has excellent electrical conductivity and laser marking ability, and therefore can be advantageously used in a component for fuels required to be laser-marked.[Molded Article]The molded article produced from the polyamide resin composition of the present invention is molded, for example, by injection molding, extrusion molding, blow molding, compression molding, roll molding, expansion molding, vacuum or compression molding, or stretch molding, but injection molding is preferred from the viewpoint of productivity. That is, the present invention comprises using the above-described polyamide resin composition as a molded article and using the polyamide resin composition as an injection molded article.The molded article made from the polyamide resin composition of the present invention can be advantageously used as a injection-welded member and a member for fuels required to be laser-written, and has excellent electrical conductivity and laser-written ability, and therefore can be particularly advantageously used as a member for fuels required to be laser-written. That is, the present invention comprises using the above-described polyamide resin composition as a injection-welded member and using the polyamide resin composition as a member for fuels.ExamplesHereinafter, the present invention will be described in more detail with reference to the following Reference Examples, Examples and Comparative Examples, which should not be construed as limiting the scope of the present invention.[Relative Viscosity]A relative viscosity was measured under the conditions in 96% sulfuric acid at a polymer concentration of 1% at a temperature of 25° C. in accordance with JIS K-6920.[Concentration of terminal amino groups]A terminal amino group concentration (10 -5 eq / g) was measured by dissolving a polyamide resin in a phenol / methanol mixed solution and subjecting the resulting solution to titration with 0.05N hydrochloric acid.[Concentration of terminal carboxyl group]A carboxyl terminal group concentration (10 -5 eq / g) was measured by dissolving a polyamide resin in benzyl alcohol and subjecting the resulting solution to titration with 0.05 N-sodium hydroxide solution.[Laser Inscription Ability]The polyamide resin compositions in Reference Examples, Examples and Comparative Examples were individually molded into a 100×70×3 mm molded article by an injection molding machine, and a print was made with the molded article using a laser inscription device manufactured by Keyence Corporation using a YVO 4( yttrium vanadate) crystal laser under such conditions that the printing speed was 1,000 mm / sec, the output was 40%, and the frequency was 20 kHz.The surface of the molded article on which printing was effected by inscription under the above-mentioned conditions was visually observed as shown in Fig. 1 and evaluated by the following criteria. A: It is possible to read the letters. B: It is difficult to read letters.[Volume Resistivity (in an absolutely dry state)]The polyamide resin compositions of Reference Examples, Examples and Comparative Examples were individually molded into a 100×70×3 mm molded article by an injection molding machine, and then, using Hiresta UP MCP-HT450 manufactured by Mitsubishi Chemical Analytech Co., Ltd., the URS probe attached to Hiresta UP MCP-HT450 was brought into contact with the center of the surface of the molded article and a voltage of 10 V was applied to the molded article for 30 seconds, and after elapse of 30 seconds, a volume resistivity was measured. This operation was repeated five times, and an average of the five measurement values was obtained.For the purpose of suppressing discharge, the acceptance criterion was a volume resistivity of 10 7 Ω·cm or less.[Volume Resistivity (after being treated with CE10 at 60 °C × 1,000 hr)]The polyamide resin compositions of Reference Examples, Examples and Comparative Examples were individually molded into a 100×70×3 mm molded article by an injection molding machine. Synthetic gasoline prepared by adding ethanol in an amount of 10 vol % to Fuel C with a ratio of toluene to isooctane of 1:1 was placed in a stainless steel autoclave, and the molded article was immersed in the synthetic gasoline at 60 °C for 1,000 hours. Then, the molded article was removed from the autoclave and allowed to stand in an atmosphere at 23° C. at 50% RH for 24 hours and using Hiresta UP MCP-HT450 manufactured by Mitsubishi Chemical Analytech Co., Ltd., the URS probe attached to the Hiresta UP MCP-HT450 was brought into contact with the center of the surface of the resulting molded article and a voltage of 10 V was applied to the molded article for 30 seconds, and after elapse of 30 seconds, the volume resistivity was measured. This operation was repeated five times, and an average of the five measurement values was obtained.For the purpose of suppressing discharge, the acceptance criterion was a volume resistivity of 10 7 Ω·cm or less.[Dimensional Change Rate After Immersion in Fuel]The polyamide resin compositions of Reference Examples, Examples and Comparative Examples were individually molded by an injection molding machine into a 200 mm×40 mm×3 mm molded article shown in FIG. 2, and allowed to stand in an atmosphere at 23° C. at 50% RH for 48 hours, and then a distance between the marking lines formed on the surface of the molded article was measured with a microscope manufactured by OLYMPUS CORPORATION to obtain a dimension before immersion in the fuel. The unit of the numbers shown in Fig. 2 is mm.Then, synthetic gasoline (CE10) prepared by adding ethanol in an amount of 10 vol % to Fuel C with a ratio of toluene to isooctane of 1:1 was placed in a stainless steel autoclave, and the molded article was immersed in the synthetic gasoline at 60 °C for 1,000 hours, and then a distance between the lines of inscription formed on the surface of the molded article was measured by means of a microscope manufactured by OLYMPUS CORPORATION to obtain a dimension after immersion in the fuel.Using the dimension obtained above before immersion in the fuel and the dimension after immersion in the fuel, a dimension change rate after immersion in the fuel was determined from the calculation formula shown below. The dimensional change rate after immersion in the fuel was determined with respect to both the engine direction (MD direction) and the transverse direction (TD direction).[Polyamide resin]• PA-1 20 kg of ε-caprolactam as the polymerizable monomer and 0.5 kg of water and metaxylylenediamine were charged into a 70 1 autoclave so that the ratio of metaxylylenediamine to ε-caprolactam was 1 / 290 (eq / mol of lactam), and the autoclave was purged with nitrogen gas, and then the mixture was heated to 100°C and stirred so that the mixture became homogeneous in the autoclave. Then, polymerization was carried out in the autoclave at 260°C under 1.7 MPa to obtain polyamide 6 (hereinafter frequently referred to as "PA-1").The relative viscosity, the amino terminal group concentration and the carboxyl terminal group concentration of the obtained PA-1 were 2.47, 5.9 (10 -5 eq / g) and 4.6 (10 -5 eq / g), respectively.• PA-2, 20 kg of ε-caprolactam as the polymerizable monomer and 0.5 kg of water and metaxylylenediamine were charged into a 70 1 autoclave so that the ratio of metaxylylenediamine to ε-caprolactam was 1 / 290 (eq / mol of lactam), and the autoclave was purged with nitrogen gas, and then the mixture was heated to 100°C and stirred so that the mixture became homogeneous in the autoclave. Then, polymerization was carried out in the autoclave at 260°C under 1.7 MPa to obtain polyamide 6 (hereinafter frequently referred to as "PA-2").The relative viscosity, the amino terminal group concentration and the carboxyl terminal group concentration of the obtained PA-2 were 2.41, 9.6 (10 -5 eq / g) and 2.6 (10 -5 eq / g), respectively.• PA-3 polyamide 66 (hereinafter frequently referred to as "PA-3") whose relative viscosity measured under conditions in 95% by mass sulfuric acid at a polyamide concentration of 1% by mass at a temperature of 25° C. according to JIS K-6920, amino group terminal concentration and carboxyl group terminal concentration are 2.75, 3.7 (10 -5 eq / g) and 6.3 (10 -5 eq / g), respectively.• PA-4 polyamide 66 (hereinafter frequently referred to as "PA-4") whose relative viscosity measured under conditions in 95% by mass sulfuric acid at a polyamide concentration of 1% by mass at a temperature of 25° C. according to JIS K-6920, amino group terminal concentration and carboxyl group terminal concentration are 3.04, 5.2 (10 -5 eq / g) and 4.5 (10 -5 eq / g), respectively.[PAN carbon fiber]• CF-1 TR06NL B6R manufactured by Mitsubishi Rayon Co., Ltd., which is a PAN carbon fiber (hereinafter frequently referred to as "CF-1"), was used.[Carbon Black]• CB-1 HI BLACK 890B manufactured by Orion Engineered Carbons, which is furnace carbon black (hereinafter frequently referred to as "CB-1"), was used.• CB-2 Ketjen black EC600JD manufactured by Lion Corporation, which is a Ketjen carbon black (hereinafter frequently referred to as "CB-2"), was used.[Black Dye]• BA-1 SPIRIT BLACK manufactured by Orient Chemical Industries Co., Ltd., which is Nirosin (hereinafter frequently referred to as "BA-1"), was used.[Glass fiber]• GF-1 T-249 manufactured by Nippo Electric Glass Co., Ltd., which is a glass fiber having a circular cross section and a glass fiber diameter of 13 μm (hereinafter frequently referred to as "GF-1"), was used.• GF-2 T-249H manufactured by Nippo Electric Glass Co., Ltd., which is a glass fiber having a circular cross section and a glass fiber diameter of 10.5 μm (hereinafter frequently referred to as "GF-2"), was used.• GF-3 CS03TA FT692 manufactured by Owens Corning Japan Ltd., which is a glass fiber having a circular cross section and a glass fiber diameter of 23 μm (hereinafter frequently referred to as "GF-3"), was used.• GF-4 CGS 3PA-820S manufactured by Nitto Boseki Co. Ltd., which is a glass fiber having an irregular cross-sectional shape, wherein the long diameter and the short diameter in the cross section along the direction perpendicular to the longitudinal direction of the fiber are 28 μm and 7 μm, respectively, and the ratio of the long diameter to the short diameter is 4.0 (hereinafter referred to frequently as "GF-4"), was used.[Fluidity Improving Agent]• FA-1 pentarite ®, manufactured by Koei Chemical Co., Ltd., which is pentaerythritol (hereinafter frequently referred to as "FA-1") was used. • FA-2 trimethylolethane, manufactured by Mitsubishi Chemical Company, Inc., (hereinafter frequently referred to as "FA-2") was used.[Reference Examples 1 to 5 and 12, Examples 5 to 11 and 13 to 20, and Comparative Examples 1 to 6]The polyamide resin, the PAN carbon fiber, the carbon black, the black colorant, the glass fiber and the fluidity improving agent shown in Table 1 were mixed in the formulation shown in Table 1 and kneaded using a twin-screw extruder, and then pelletized by a pelletizer to obtain pellets of a polyamide resin composition. Using the obtained pellets of the polyamide resin composition, the measurements and evaluation were conducted according to the above-described methods. The results are shown in Table 1.The entire disclosure of Japanese Patent Application No. 2014-218685 (filing date: Oct. 27, 2014) and the entire disclosure of Japanese Patent Application No. 2014-223413 (filing date: Oct. 31, 2014) are incorporated into the present specification by reference thereto. All of the reference documents, patent applications, and technical standards described in the present specification are incorporated into the present specification with reference thereto to the same extent as in the case where each of the reference documents, patent applications, and technical standards is specifically and individually designated to be incorporated into the present specification by reference to each one of them.

Claims

A polyamide resin composition comprising a polyamide resin, a PAN carbon fiber, carbon black, a black dye, a glass fiber, and a fluidity improving agent, wherein the amount of the PAN carbon fiber is 7.5 to 25 wt% based on the weight of the composition, the amount of the carbon black is 0.03 to 0.52 wt% based on the weight of the composition, the amount of the black dye is 0.02 to 0.5 wt% based on the weight of the composition, the amount of the glass fiber is 15 to 60 wt% based on the weight of the composition, the amount of the fluidity improving agent is 0.01 to 5 wt% based on the weight of the composition, and the polyamide resin is at least one polyamide resin selected from the group consisting of polyamide 6, polyamide 66, Polyamide 610, polyamide 1010, polyamide 6 / 66, polyamide 11, polyamide 12, polyamide 6 / 12, and polyamide 6 / 66 / 12.The polyamide resin composition according to claim 1, which contains the black dye in an amount of 0.05 to 0.3 % by weight based on the weight of the composition.The polyamide resin composition according to claim 1 or 2, wherein the polyamide resin comprises a polyamide resin having an amino terminal group concentration greater than a carboxyl terminal group concentration.The polyamide resin composition according to any one of claims 1 to 3, wherein the polyamide resin is polyamide 6 and / or polyamide 66.The polyamide resin composition according to claim 1, wherein the fluidity improving agent is at least one polyhydric alcohol selected from the group consisting of pentaerythritol, dipentaerythritol and trimethylolethane.A molded article made from the polyamide resin composition according to any one of claims 1 to 5.The molded article according to claim 6, which is obtained by injection molding.A molded article according to claim 6 or 7, which is a component for fuels.The molded article according to claim 6 or 7, which is a component for fuels requiring laser marking.The molded article according to claim 6 or 7, which is a spray welded member.A component for fuels requiring laser marking, comprising the polyamide resin composition according to claim 1.

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