JP5813998B2 - Paper conveying member - Google Patents

Description

  The present invention relates to a paper conveying member excellent in antistatic properties, abrasion resistance, surface smoothness and the like.

  It has been proposed that parts used in electronic devices such as copy machines be formed of a resin composition having antistatic properties and the like in order to prevent electronic devices from being damaged by static electricity. For example, JP-A-5-262971 (Patent Document 1) discloses (A) polyamide elastomer, (B) polycarbonate resin, (C) polyamide resin, (D) carboxyl group, epoxy group, amino group, hydroxyl group, A thermoplastic resin composition comprising a modified vinyl polymer containing at least one functional group selected from a polyalkylene oxide group or a derivative thereof, and (E) a styrene resin and / or an acrylic resin. It is disclosed.

  Japanese Patent Publication No. 7-10946 (Patent Document 2) discloses (a) an aminocarboxylic acid or lactam having 6 or more carbon atoms, or a diamine and dicarboxylic acid salt having 6 or more carbon atoms, and (b) a number average molecular weight. A polyether ester amide composed of 200 to 6000 polyethylene glycol and (c) a dicarboxylic acid having 4 to 20 carbon atoms, wherein the polyether ester amide is 95 to 10% by weight, and (B) (A) a graft copolymer obtained by graft polymerization of a monomer mixture comprising (b) an aromatic vinyl monomer and a vinyl cyanide monomer on a rubbery weight body; and (C) an aromatic vinyl. A copolymer obtained by polymerizing a monomer mixture comprising a vinyl monomer, a vinyl cyanide monomer and other vinyl monomers copolymerizable therewith, The thermoplastic resin composition containing the rubber polymer are disclosed, it is described that can mix thermoplastic polymer is other compatible such as polyamide.

  However, when a paper conveying member is formed using these thermoplastic resin compositions, the mechanical strength is not sufficient, and abrasion due to sliding of paper cannot be effectively suppressed. In particular, when a paper passing member (or contact member) such as a bill counting machine having a paper passing part (or contact part) through which paper such as bank notes passes at a high speed, a ballot counting machine is formed, a paper jam occurs. The paper cannot be counted accurately due to sliding contact with the paper. Further, burrs are easily generated on the paper conveying member, which causes a paper jam.

  Japanese Patent Application Laid-Open No. 2008-284515 (Patent Document 3) discloses a voltage application member for a dust collection element composed of a thermoplastic resin, a semiconductive component, and a flame retardant. In the examples of this document, polyamide resin, ABS resin, and AS resin as thermoplastic resins, polyetheresteramide as a semiconductive component, glass fiber as a filler, halogen flame retardant, flame retardant A voltage application member for a dust collection element composed of an auxiliary agent is produced. However, this document does not describe any paper conveying member.

JP-A-5-262971 (Claims, [0002]) Japanese Patent Publication No. 7-10946 (Claims, [Prior Art]) JP 2008-284515 A (Claims, Examples)

  Accordingly, an object of the present invention is to provide a paper conveying member (paper passing member or contact member) having excellent antistatic properties, wear resistance, and surface smoothness.

  Another object of the present invention is to provide a paper conveying member that can prevent electrification and suppress wear even when paper is passed at high speed.

  Still another object of the present invention is to provide a paper conveying member that can effectively suppress the generation of burrs and has improved slidability with respect to paper.

  Another object of the present invention is to provide a paper conveying member having improved heat resistance.

  Still another object of the present invention is to provide a paper conveying member that can suppress warping and has high dimensional accuracy.

  As a result of intensive studies to achieve the above problems, the present inventor has found that when a paper transport member is formed by combining a polyamide resin, a polymer antistatic agent, and a filler, antistatic properties, wear resistance, and surface smoothness are formed. As a result, the present invention was completed.

  That is, the paper conveying member of the present invention is formed of a thermoplastic resin composition containing a polyamide resin, a polymer antistatic agent, and a filler.

  The polymer antistatic agent may be a polyamide elastomer. The polyamide elastomer may be a polyether ester amide. The melting point of the polyamide elastomer may be 200 ° C. or less (for example, about 150 to 200 ° C.). The proportion of the polymer antistatic agent (for example, polyamide elastomer) is about 10 to 150 parts by weight with respect to 100 parts by weight of the polyamide resin. The filler may be glass fiber. The ratio of a filler is about 10 to 50 weight% with respect to the whole thermoplastic resin composition. The thermoplastic resin composition further comprises a styrene resin [for example, at least an aromatic vinyl monomer and a vinyl cyanide monomer and / or a (meth) acrylic monomer are graft-polymerized on the rubber component. Graft copolymer etc.] may be included. The thermoplastic resin composition may further contain a flame retardant.

  The present invention also provides a method for producing a paper conveying member by molding (such as injection molding) a thermoplastic resin composition containing a polyamide resin, a polymer antistatic agent (for example, polyamide elastomer), and a filler. Includes. In addition, the present invention provides a paper conveying member formed by molding (such as injection molding) with a thermoplastic resin composition containing a polyamide resin, a polymer antistatic agent (for example, polyamide elastomer), and a filler. A method for improving the surface smoothness of the conveying member is also included.

  In the present invention, since a paper transport member (paper passing member or contact member) is formed by combining a polyamide resin, a polymer type antistatic agent (for example, polyamide elastomer) and a filler, antistatic properties, abrasion resistance, And excellent surface smoothness. In particular, even when paper is passed at a high speed, high antistatic properties and abrasion resistance can be imparted, paper jams can be prevented, and paper can be counted accurately. Further, in the present invention, although a polyamide-based resin is included, the generation of burrs can be effectively suppressed, and the slidability with respect to paper can be improved. Furthermore, in the present invention, durability against paper sliding (especially high-speed sliding) can be improved, and for example, high heat resistance that can withstand frictional heat accompanying paper sliding can be imparted. When the paper conveying member of the present invention is further formed in combination with a styrenic resin, warpage can be effectively suppressed, dimensional accuracy can be improved, and mechanical properties such as impact resistance can be improved.

[Paper conveying member]
The paper conveyance member (or molded article for paper conveyance) of the present invention is a thermoplastic resin composition (or polyamide resin composition) containing a polyamide resin (non-elastomeric polyamide resin), a polymer antistatic agent, and a filler. ).

(A) Thermoplastic resin (or resin component)
(A1) Polyamide resin The polyamide resin may be either a homopolymer of an amide-forming component (homopolyamide) or a copolymer of a plurality of amide-forming components (copolyamide). Examples of the amide-forming component include a pair of components (both components obtained by combining a diamine component and a dicarboxylic acid component), a lactam component, an aminocarboxylic acid component, and the like.

Of the pair of components, the diamine component includes an aliphatic diamine or an alkylene diamine component (for example, C _4-16 alkylene diamine such as tetramethylene diamine, hexamethylene diamine, trimethyl hexamethylene diamine, octamethylene diamine, dodecane diamine, etc. ), Alicyclic diamine component [diamino C _5-10 cycloalkane such as diaminocyclohexane; di (amino C _1-4 alkyl) C _6-10 cycloalkane such as hydrogenated metaxylylenediamine; bis (4-aminocyclohexyl) ) Bis (amino C _5-8 cycloalkyl) C _1-3 alkane etc.) such as methane], aromatic diamine component [di (amino C _1-4 alkyl) C _6-10 arene etc. such as metaxylylenediamine, etc. ] Etc. can be illustrated. These diamine components may be used alone or in combination of two or more. Of these diamine components, aliphatic diamine components are preferred.

The dicarboxylic acid component, aliphatic dicarboxylic acid or alkane dicarboxylic acid component (e.g., adipic acid, pimelic acid, azelaic acid, sebacic acid, dodecanedioic acid, C _4-20 alkane dicarboxylic acids such as dimer acid or a hydrogenated product thereof ), Alicyclic dicarboxylic acid component (C _5-10 cycloalkane-dicarboxylic acid such as cyclohexane-1,4-dicarboxylic acid, cyclohexane-1,3-dicarboxylic acid, etc.), aromatic dicarboxylic acid (terephthalic acid, isophthalic acid, etc.) C _6-10 arene-dicarboxylic acid such as acid) and the like. The dicarboxylic acid component also includes lower alkyl esters ( _C1-4 alkyl esters such as methyl esters) of the dicarboxylic acids, acid halides, and the like. These dicarboxylic acid components may be used alone or in combination of two or more. Of these dicarboxylic acid components, aliphatic dicarboxylic acid components are preferred.

Examples of the lactam component include δ-valerolactam, ε-caprolactam, ω-heptalactam, ω-octacactam, ω-decane lactam, ω-undecanactam, ω-laurolactam (or ω-laurinlactam), and the like. Examples thereof include C _4-20 lactam, and examples of the aminocarboxylic acid component include C _4-20 aminocarboxylic acids such as ω-aminodecanoic acid, ω-aminoundecanoic acid, and ω-aminododecanoic acid. These lactam components and aminocarboxylic acid components may be used alone or in combination of two or more.

  These amide-forming components may be used alone or in combination of two or more. The copolyamide based on two or more amide-forming components is (i) a copolyamide based on a first amide-forming component (diamine component and dicarboxylic acid component), and at least one of the diamine component and dicarboxylic acid component is A copolyamide composed of a plurality of components having different carbon numbers; (ii) selected from a first amide-forming component (diamine component and dicarboxylic acid component) and a second amide-forming component (lactam component and aminocarboxylic acid component) (Iii) a copolyamide formed with a second amide-forming component (at least one component selected from a lactam component and an aminocarboxylic acid component), comprising: a lactam component; One of the aminocarboxylic acid components is a copolymer composed of a plurality of components having different carbon numbers. ; (Iv) carbon atoms and the like copolyamide identical or different lactam component and aminocarboxylic acid component. The copolyamide may be a multi-component copolymer (for example, a binary copolymer to a quaternary copolymer).

  The polyamide resin may contain a small amount of units derived from a polycarboxylic acid component and / or a polyamine component. That is, the polyamide resin may be a modified polyamide such as a polyamide into which a branched chain structure is introduced.

Typical polyamide resins include aliphatic polyamides, for example, a condensate of an aliphatic diamine component and an aliphatic dicarboxylic acid component (for example, polyamide 46, polyamide 66, polyamide 610, polyamide 612, polyamide 1010, polyamide 1012, polyamide 1212). Homopolymers of lactams (such as C _4-20 lactams such as ε-caprolactam, ω-laurolactam) or aminocarboxylic acids (such as C _4-20 aminocarboxylic acids such as ω-aminoundecanoic acid) Polyamide 6, polyamide 11, polyamide 12, etc.); copolyamides in which these amide-forming components are copolymerized (for example, copolyamide 6/11, copolyamide 6/12, copolyamide 66/6, copolyamide 66/11, copolyamide Polyamide 66/12) It is.

  The polyamide resin does not contain a polyamide elastomer (in particular, a polyamide elastomer as a polymer type antistatic agent described later).

  These polyamide resins can be used alone or in combination of two or more. Preferred polyamide resins often contain units derived from amide-forming components selected from polyamide 6 and polyamide 66.

  The number average molecular weight of the polyamide resin may be, for example, about 6,000 to 100,000, preferably 8,000 to 50,000, and more preferably about 10,000 to 30,000 in terms of polystyrene. The molecular weight of the polyamide resin can be measured by gel permeation chromatography using, for example, HFIP (hexafluoroisopropanol) as a solvent.

  The polyamide resin may be amorphous or may have crystallinity. The melting point (or softening point) of the polyamide resin may be, for example, 200 to 280 ° C. (for example, 220 to 280 ° C.), preferably 230 to 270 ° C., and more preferably about 240 to 260 ° C. The melting point of the polyamide resin can be measured with a differential scanning calorimeter (DSC).

  The melt flow rate (MFR) of the polyamide resin is, for example, about 1 to 200 g / 10 minutes, preferably 5 to 150 g / 10 minutes, more preferably about 10 to 120 g / 10 minutes under the conditions of a load of 1 kg and 230 ° C. There may be.

  A polyamide resin is usually used as a base resin. The ratio of the polyamide resin may be, for example, about 20 to 80% by weight, preferably about 25 to 70% by weight, and preferably about 30 to 60% by weight with respect to the entire thermoplastic resin composition.

(A2) Polymer type antistatic agent Since the polymer type antistatic agent is excellent in antistatic properties and charge attenuation properties, it can effectively prevent damage to electronic equipment due to electrostatic force, and can be applied to the surface of the molded product. It is possible to prevent impurities such as dust from adhering. In addition, the polymer antistatic agent can smooth the surface of the molded body and improve the slidability with respect to paper. Furthermore, the polymer antistatic agent can also improve impact resistance, molding processability and the like. In addition, by combining the polyamide resin and the polymer type antistatic agent, durability against frictional force and frictional heat caused by sliding of paper (especially high-speed sliding) (strength and heat resistance of the molded product) is also achieved. It can be secured.

The polymer type antistatic agent is not particularly limited, and for example, an olefin block (for example, a polyolefin block composed of a C _2-6 olefin monomer such as ethylene or propylene) and a hydrophilic block (polyethylene). A block copolymer with ethylene oxide, polypropylene oxide, poly _C2-4 alkylene oxide such as polyethylene oxide-polypropylene oxide) may be used, but a polyamide elastomer is preferred from the viewpoint of affinity with a polyamide resin.

  As the polyamide elastomer (polyamide block copolymer), a polyamide block copolymer composed of polyamide as a hard segment (or hard block) and a soft segment (or soft block), for example, polyamide-polyether block copolymer Examples thereof include a polymer, a polyamide-polyester block copolymer, and a polyamide-polycarbonate block copolymer.

As the polyamide constituting the hard segment, the amide-forming component alone or a copolymer (for example, a polyamide containing a C _6-12 alkylene chain, in particular, polyamide 6, polyamide 11, polyamide 12, polyamide 66, polyamide 610, polyamide) 612, and polyamides containing units derived from amide-forming components selected from polyamide 1010). The polyamide as the hard segment usually contains units derived from C _6-12 aminocarboxylic acid components such as 6-aminohexanoic acid and 12-aminododecanoic acid.

  The ratio of the hard segment is, for example, about 20 to 70% by weight, preferably about 25 to 50% by weight with respect to all the segments (the total of the hard segment and the soft segment).

  A typical polyamide elastomer is a polyamide-polyether block copolymer. In the polyamide-polyether block copolymer, the polyether (polyether block) may be, for example, an aliphatic diol, an alicyclic diol, or an alkylene oxide adduct (polyalkylene oxide) of an aromatic diol. Good.

Examples of the aliphatic diol include C _2-10 alkane diols such as ethylene glycol, propylene glycol, 1,2-, 1,3-, 1,4-, or 2,3-butanediol, and 1,6-hexanediol. Can be illustrated. Examples of the alicyclic diol include dihydroxy C _5-10 cycloalkanes such as 1,3-cyclopentanediol, 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, 1,4-cyclooctanediol, and di ( Hydroxy _C1-4 alkyl) _C5-10 cycloalkane etc. can be illustrated. Examples of the aromatic diol include dihydroxyarene (such as dihydroxy C _6-10 arene such as hydroquinone, catechol, resorcin, and naphthalenediol), and dihydroxybiaryl (4,4′-dihydroxybiphenyl, 1,1′-bi-2-naphthol). Dihydroxybi C _6-10 aryl, etc.), bis (hydroxyaryl) alkane [bis (hydroxy C _6-10 aryl) C _1-4 alkane, such as bisphenol A, B, C, F, S, AD], etc. Can be illustrated.

Examples of the alkylene oxide added to the diol include C _2-6 alkylene oxides such as ethylene oxide, propylene oxide, and butylene oxide. The alkylene oxide may be optionally substituted with a substituent (such as an epoxy group). These alkylene oxides may be added to the diol singly or in combination of two or more. When two or more kinds of alkylene oxides are added, the addition form may be random and / or block. Of these alkylene oxides, C _2-4 alkylene oxides such as ethylene oxide and / or propylene oxide are preferred.

  The average added mole number of alkylene oxide may be about 1 to 300 (for example, 5 to 200), preferably about 10 to 150, and more preferably about 10 to 100 (for example, 20 to 80).

A typical polyether (or polyether block) is an alkylene oxide adduct (polyalkylene glycol) of an aliphatic diol. Examples of the polyalkylene glycol include poly C _2-6 alkylene glycol (preferably poly C _2-4 alkylene glycol) such as polyethylene glycol, polypropylene glycol, and polytetramethylene glycol.

  Examples of the polyamide-polyether block copolymer include a block copolymer obtained by copolycondensation of a polyamide block having a reactive end group and a polyether block having a reactive end group, such as polyether amide ( For example, a block copolymer of a polyamide block having a diamine end and a polyether block having a dicarboxyl end, a block copolymer of a polyamide block having a dicarboxyl end and a polyether block having a diamine end), polyether Examples thereof include block copolymers of ester amides (polyamide blocks having dicarboxyl ends and polyether blocks having dihydroxy ends). A preferred polyamide-polyether block copolymer is a polyetheresteramide.

  These polymer antistatic agents can be used alone or in combination of two or more.

  The number average molecular weight of the polymer type antistatic agent [for example, polyamide elastomer (polyamide block copolymer)] is 1000 or more (for example, 1000 to 100,000), preferably 2000 to 60000, more preferably 2000 to 2000 in terms of polystyrene. It is about 50000 (for example, 3000 to 20000). The molecular weight of the polymer antistatic agent can be measured by gel permeation chromatography using, for example, HFIP (hexafluoroisopropanol) as a solvent.

  The melting point of the polymer antistatic agent (for example, polyamide elastomer) is, for example, about 150 to 250 ° C., preferably 160 to 240 ° C., more preferably about 170 to 230 ° C. (for example, 180 to 220 ° C.). It may be 200 ° C. or lower (for example, about 150 to 200 ° C.). The melting point of the polymer antistatic agent can be measured with a differential scanning calorimeter (DSC).

The surface resistivity (Ω) of the polymer antistatic agent (for example, polyamide elastomer) is, for example, 1 × 10 ⁶ to 1 × 10 ¹⁰ , preferably when left at a temperature of 23 ° C. and a humidity of 50% RH for 24 hours. May be about 5 × 10 ⁶ to 1 × 10 ⁹ , more preferably about 1 × 10 ⁷ to 1 × 10 ⁸ (for example, 2 × 10 ^{7 to} 5 × 10 ⁸ ).

  The polymer antistatic agent alone has high antistatic properties, but may be used in combination with metal salts. When combined with metal salts, the metal ions dissociated from the metal salts act on the hydrophilic block (for example, polyether block) of the polymer antistatic agent to develop ionic conductivity, thereby preventing antistatic The durability of the agent can be further improved. In addition, as the metal salts that can impart such ion conductivity, for example, metal salts described in JP-A Nos. 2003-277622 and 2004-175945 can be used.

  As the metal salts, alkali metal salts and alkaline earth metal salts are usually used. In particular, metal salts of halogen-containing acids, such as alkali metal salts of perchlorate (lithium perchlorate, sodium perchlorate, perchlorate). Potassium alkaline acid metal salts (such as magnesium perchlorate), alkali metal trifluoromethanesulfonate (such as lithium trifluoromethanesulfonate, sodium trifluoromethaneate), and bis (trifluoromethanesulfonyl) imide Alkali metal salts [bis (trifluoromethanesulfonyl) imide lithium, bis (trifluoromethanesulfonyl) imide sodium, bis (trifluoromethanesulfonyl) imide potassium, etc.], alkali metal salts of tris (trifluoromethanesulfonyl) methide [tri (Trifluoromethanesulfonyl) Mechidorichiumu, tris (trifluoromethanesulfonyl) methide sodium, etc.] and the like. These metal salts can be used alone or in combination of two or more. Among these metal salts, lithium salts such as lithium metal salts having a fluorine atom and a sulfonyl group or a sulfonic acid group such as lithium trifluoromethanesulfonate, lithium bis (trifluoromethanesulfonyl) imide lithium, tris (trifluoromethanesulfonyl) methide lithium, etc. Is preferred.

  The proportion of the metal salt is, for example, 0.01 to 30 parts by weight, preferably 0.05 to 20 parts by weight, and more preferably 0.1 to 100 parts by weight of the polymer antistatic agent (for example, polyamide elastomer). About 1 to 10 parts by weight.

  The polymer type antistatic agent may be prepared by a known method, but is available from Sanyo Chemical Industries, Ltd. under the trade names “Pelestat NC6321”, “Pelestat HC6800”, and the like.

  The ratio of the polymer type antistatic agent [for example, polyamide elastomer (for example, polyether ester amide)] can be selected from a range of, for example, about 10 to 150 parts by weight with respect to 100 parts by weight of the polyamide resin. It may be about 20 parts by weight, preferably 20 to 90 parts by weight, and more preferably about 30 to 80 parts by weight (for example, 35 to 75 parts by weight). The proportion of the polymer antistatic agent [for example, polyamide elastomer (for example, polyether ester amide)] is, for example, 1 to 50% by weight (for example, 5 to 40% by weight) with respect to the entire thermoplastic resin composition. %), Preferably 10 to 35% by weight, more preferably about 15 to 30% by weight. In the present invention, even if the proportion of the polymer type antistatic agent is large, the mechanical strength and heat resistance can be sufficiently secured, and the antistatic property, surface smoothness, impact resistance, molding processability and the like can be improved.

(A3) Other thermoplastic resins The thermoplastic resin composition may further contain other thermoplastic resins other than the polyamide resin and the polymer antistatic agent. Other thermoplastic resins include olefin resins, vinyl resins, halogen-containing resins, vinyl ester resins, vinyl ether resins, (meth) acrylic resins, styrene resins, polyester resins, polycarbonate resins, polyurethane resins. Examples thereof include polyphenylene ether resins, polysulfone resins, polyphenylene sulfide resins, polyimide resins, cellulose derivatives, and thermoplastic elastomers. These thermoplastic resins can be used alone or in combination of two or more. Of these thermoplastic resins, styrenic resins are preferred because they are excellent in moldability, prevent warping of the molded body, improve dimensional accuracy, and effectively suppress the generation of burrs.

The styrenic resin is a homopolymer or a copolymer formed with an aromatic vinyl monomer as a main constituent unit. As an aromatic vinyl monomer (or styrene monomer) for forming a styrene resin, for example, styrene, styrene having an alkyl group substituted on a benzene ring (for example, vinyl toluene, vinyl xylene, p-ethyl). Styrene, p-isopropylstyrene, p-butylstyrene, C _1-6 alkyl-substituted styrene such as pt-butylstyrene), styrene having a benzene ring substituted with a halogen atom (for example, chlorostyrene, bromostyrene, etc.), Examples include α-alkyl-substituted styrene substituted with an alkyl group at the α-position (for example, α-C _1-6 alkylstyrene such as α-methylstyrene). These aromatic vinyl monomers can be used alone or in combination of two or more. Of these monomers, styrene, vinyltoluene, α-methylstyrene and the like are usually used, and styrene is particularly used.

The aromatic vinyl monomer may be used in combination with a copolymerizable monomer. Examples of the copolymerizable monomer include vinyl cyanide monomers [for example, (meth) acrylonitrile, etc.], unsaturated polyvalent carboxylic acids or acid anhydrides thereof (for example, maleic acid, itaconic acid, citracone). Acid or acid anhydride thereof), imide monomers [for example, maleimide, N-alkylmaleimide (for example, N- _C1-4 alkylmaleimide), N-cycloalkylmaleimide (for example, N- _{C5- 10} cycloalkylmaleimide), N-arylmaleimide (for example, N-phenylmaleimide)], (meth) acrylic monomer [for example, (meth) acrylic acid; (meth) acrylic acid methyl, (meth) acrylic Ethyl acetate, propyl (meth) acrylate, butyl (meth) acrylate, hexyl (meth) acrylate, (meth) acrylic Octyl, (meth) (meth) acrylic acid _{C 1-16} alkyl esters such as 2-ethylhexyl acrylate; (meth) (meth) acrylic acid _{C 5-10} cycloalkyl esters such as cyclohexyl acrylate; (meth) acrylic acid (meth) acrylic acid _{C 6-10} aryl ester such as phenyl; (meth) (meth) acrylic acid _{C 6-10} aralkyl such as benzyl acrylate; glycidyl (meth) acrylate; (meth) acrylic acid 2-hydroxyethyl And (meth) acrylic acid hydroxy C _2-4 alkyl esters such as 2-hydroxypropyl (meth) acrylate]. These copolymerizable monomers can be used alone or in combination of two or more. Of these copolymerizable monomers, at least vinyl cyanide monomers such as (meth) acrylonitrile are widely used.

  In the styrenic resin, the ratio (molar ratio) between the aromatic vinyl monomer (or the unit derived from the aromatic vinyl component) and the copolymerizable monomer (or the unit derived from the copolymerizable component) is, for example, The former / the latter = 50/50 to 99/1, preferably 60/40 to 97/3, and more preferably about 70/30 to 95/5.

  The styrene resin may be a rubber-containing styrene resin (or rubber reinforced styrene resin). The rubber-containing styrenic resin is used to improve impact resistance and buffering properties, and has a form in which rubber components are dispersed in the form of particles in a matrix composed of the styrenic resin. The rubber-containing styrene resin is, for example, a mixture (or blend) of a styrene resin and a rubber component, or a copolymer obtained by copolymerizing at least an aromatic vinyl monomer (graft polymerization, block polymerization, etc.) with the rubber component. Usually, a graft copolymer obtained by graft-polymerizing at least an aromatic vinyl monomer to a rubber component by a conventional method (bulk polymerization, bulk suspension polymerization, solution polymerization, emulsion polymerization, etc.) (Rubber-grafted polystyrene polymer).

Examples of the rubber component (rubber-like polymer) of the rubber-containing styrene resin include diene rubber [polybutadiene (low cis type or high cis type polybutadiene), polyisoprene, copolymer rubber (eg, styrene-butadiene copolymer). Styrene-isoprene copolymer, styrene-diene copolymer such as styrene-isobutylene-butadiene copolymer, butadiene-acrylonitrile copolymer, isobutylene-isoprene copolymer)), ethylene-vinyl acetate copolymer, Acrylic rubber (copolymer elastomer mainly composed of polyacrylic acid C _2-8 alkyl ester), ethylene-α-olefin copolymer [ethylene-propylene rubber (EPR), etc.], ethylene-α-olefin-polyene Copolymer [Ethylene-propylene-diene rubber (EP M), etc.], urethane rubber, silicone rubber, butyl rubber, hydrogenated diene rubbers (hydrogenated styrene - butadiene copolymer, and hydrogenated butadiene polymer), and polyester elastomer. In these rubber components, the copolymer may be a random or block copolymer, and the block copolymer has a structure such as an AB type, an ABA type, a tapered type, or a radial teleblock type. May be. These rubber components can be used alone or in combination of two or more.

  Preferred rubber components are diene rubbers (particularly butadiene rubbers), such as polybutadiene (butadiene rubber), isoprene rubber, and styrene-butadiene rubber (polystyrene-polybutadiene block copolymer).

  The content of the rubber component is about 1 to 60% by weight, preferably 3 to 50% by weight, more preferably 5 to 30% by weight (for example, 10 to 30% by weight) with respect to the entire rubber-containing styrenic resin. is there.

  The form of the rubber-like polymer dispersed in the matrix composed of the styrene resin is not particularly limited, and may be a salami structure, a core / shell structure, an onion structure, or the like.

  The particle size of the rubbery polymer constituting the dispersed phase is, for example, a volume average particle size of 0.5 μm or more (for example, 0.5 to 30 μm), preferably 0.5 to 10 μm, more preferably 0.5 to 7 μm. It can be selected from a range of about (for example, 0.5 to 5 μm). The graft ratio of the rubbery polymer is about 5 to 150%, preferably about 10 to 150%.

These styrenic resins can be used alone or in combination of two or more. Of these styrene resins, rubber-containing styrene resins are preferred. Typical rubber-containing styrene resins are (i) impact-resistant polystyrene (or rubber-reinforced polystyrene, HIPS) in which an aromatic vinyl monomer is graft-polymerized on a rubber component, and (ii) aromatic vinyl on a rubber component. A monomer, a vinyl cyanide monomer and / or a (meth) acrylic monomer [for example, a (meth) acrylic acid C _1-4 alkyl such as methyl (meth) acrylate], and the like. Examples thereof include a polymer obtained by polymerization (such as graft polymerization) of an unsaturated polyvalent carboxylic acid or an acid anhydride thereof and / or an imide monomer. Specifically, these rubber-containing styrene resins include ABS resin (acrylonitrile-butadiene rubber-styrene resin), modified ABS resin [for example, methyl methacrylate-modified ABS resin (transparent ABS resin), carboxylic acid-modified ABS resin. Carboxylic anhydride-modified ABS resin, imide-modified ABS resin, etc.], AXS resin [rubber component X (acrylic rubber, chlorinated polyethylene, ethylene-propylene rubber, ethylene-vinyl acetate copolymer, etc.), acrylonitrile A and styrene S Graft-polymerized resin such as AAS resin (acrylonitrile-acrylic rubber-styrene resin), AES resin (acrylonitrile-ethylene / propylene rubber-styrene resin), etc., modified AXS resin (for example, methyl methacrylate-modified AXS resin) , MBS Fat (methyl methacrylate - butadiene rubber - styrene resin), and others.

  The rubber-containing styrenic resins can be used alone or in combination of two or more. Of the rubber-containing styrene resins, unmodified or modified ABS resins (for example, unmodified or carboxylic acid modified ABS resins) are preferable.

  In the rubber-containing styrenic resin, the proportion of units derived from the modifying component [unsaturated polyvalent carboxylic acid or its acid anhydride, imide-based monomer, etc.] is the single unit that forms the styrene resin of the rubber-containing styrenic resin. It may be, for example, about 0 to 30% by weight, preferably 0 to 20% by weight, and more preferably 0 to 10% by weight (for example, 0.1 to 10% by weight) with respect to the entire monomer.

  The weight average molecular weight of the styrene resin (matrix resin in the case of a rubber-containing styrene resin) is 10,000 to 1,000,000, preferably 50,000 to 500,000, more preferably 100,000 to 500,000. About 000.

  The ratio of other thermoplastic resins (for example, styrene resin) is not particularly limited as long as the effect of the present invention is not impaired, and is about 0.1 to 100 parts by weight with respect to 100 parts by weight of polyamide resin. For example, 0.5 to 50 parts by weight, preferably 1 to 40 parts by weight, and more preferably about 5 to 30 parts by weight.

(B) Additives (B1) Fillers As fillers (or fillers or fillers), organic fillers (fibrous fillers such as aramid fibers and cellulose fibers; granular fillers, etc.), inorganic fillers (glass) Examples thereof include fibrous fillers such as fibers, silica fibers, alumina fibers, carbon fibers, and metal fibers; and particulate fillers such as talc, mica, and glass flakes). These fillers can be used alone or in combination of two or more. Of these fillers, fibrous fillers such as glass fibers are preferable from the viewpoint of improving surface smoothness. The fibrous filler such as glass fiber may be surface-treated with a surface treatment agent (or sizing agent). Examples of the surface treatment agent include a urethane resin, an epoxy resin, an acrylic resin, a coupling agent (such as a silane coupling agent), and the like. These surface treatment agents can be used alone or in combination of two or more.

  The average fiber diameter of the fibrous filler may be, for example, about 1 to 30 μm, preferably 5 to 20 μm, and more preferably about 10 to 15 μm.

  The fibrous filler may be a short fiber (chopped fiber) or a long fiber. Note that breakable fibers such as glass fibers may have a short fiber length due to melt-kneading. Therefore, the weight average fiber length of the short fibers before kneading may be, for example, about 0.01 to 10 mm, preferably about 0.05 to 5 mm (for example, 0.1 to 4 mm). In a paper conveying member formed by melting and kneading a resin composition containing short fibers as a fibrous filler, the weight average fiber length of the fibrous filler is, for example, 0.01 to 1 mm, preferably 0.1 to 1 mm. More preferably, it may be about 0.1 to 0.8 mm.

  The pellet length (weight average fiber length of the long fibers before kneading) of the resin composition pellets including the fiber bundle in which long fibers are bundled in the length direction and impregnated with the resin is integrated is, for example, 4 to 50 mm, preferably May be about 5 to 45 mm (for example, 10 to 40 mm). In a paper conveying member formed by melting and kneading a resin composition containing long fibers as a fibrous filler, the weight average fiber length of the fibrous filler is, for example, 0.1 to 10 mm, preferably 0.3 to 5 mm. More preferably, it may be about 0.5 to 3 mm.

  The weight average fiber length is determined by a conventional method, for example, a fibrous filler (in the case of a molded body, the resin is incinerated at a temperature lower than the melting point of the fibrous filler and the remaining fibrous filler, etc.) is dispersed. For the dispersion, a micrograph of a predetermined size is taken, 200 fiber lengths are measured, and the dispersion can be calculated based on the following formula.

Weight average fiber length = (ΣNi × Li ² ) / (ΣNi × Li)
(In the formula, Li indicates the fiber length of each fiber, and Ni indicates the number of fiber lengths Li)
The ratio of the filler is, for example, 10 to 70 with respect to 100 parts by weight of the entire resin component [(A1) polyamide resin, (A2) polymer type antistatic agent, and (A3) other thermoplastic resin]]. It can be selected from a range of about parts by weight, and may be about 10 to 60 parts by weight, preferably 15 to 55 parts by weight, and more preferably about 20 to 50 parts by weight. Further, the ratio of the filler may be, for example, about 10 to 50% by weight, preferably 10 to 40% by weight, and more preferably about 15 to 35% by weight with respect to the entire thermoplastic resin composition.

(B2) Other additive The thermoplastic resin composition may contain other additives other than a filler, if necessary. Other additives include stabilizers (antioxidants, UV absorbers, light stabilizers, heat stabilizers, etc.), low molecular weight antistatic agents, flame retardants, flame retardant aids, compatibilizers, crosslinking agents Agent, nucleating agent, coupling agent, lubricant, sliding agent (particulate sliding agent such as spherical silicone rubber particles or silicone resin particles), plasticizer, release agent, impact resistance improving agent, hue improving agent, flow It may contain a property improver, a colorant (such as a dye), a dispersant, an antibacterial agent, and an antiseptic. These additives can be used alone or in combination of two or more. The thermoplastic resin composition may include, for example, at least one selected from a compatibilizer and a flame retardant among the additives.

  The compatibilizing agent is usually used when the thermoplastic resin composition contains (A3) another thermoplastic resin. The compatibilizing agent is not particularly limited as long as it is compatible with a plurality of thermoplastic resins. For example, when the thermoplastic resin composition contains a styrene resin (for example, a resin obtained by grafting an aromatic vinyl monomer and a vinyl cyanide monomer to a rubber component such as an ABS resin) as a compatibilizing agent. , A resin different from the styrene resin [for example, modified AS resin (carboxylic acid modified AS resin, carboxylic anhydride modified AS resin, imide modified AS resin, etc.), modified ABS resin (carboxylic acid modified ABS resin, carboxylic anhydride, etc. Modified ABS resin, imide-modified ABS resin, etc.). The compatibilizers can be used alone or in combination of two or more.

  The proportion of the compatibilizing agent can be selected from a range of about 0.1 to 100 parts by weight with respect to 100 parts by weight of (A3) another thermoplastic resin (for example, styrene resin), for example, 20 to 80 parts by weight. The amount is preferably about 30 to 70 parts by weight, more preferably about 40 to 60 parts by weight. The ratio of the compatibilizer is, for example, 0.1% with respect to the entire resin component [(A1) polyamide resin, (A2) polymer type antistatic agent, and (A3) other thermoplastic resin]]. -20% by weight, preferably 0.5-15% by weight, more preferably about 1-10% by weight.

  Examples of the flame retardant include halogen-based flame retardants [for example, brominated flame retardants (for example, tetrabromobisphenol A, tribromophenyl allyl ether, hexabromocyclododecane, bis (tetrabromophthalimide) ethane, bis (pentabromophenyl) ethane. Brominated low molecular weight compounds such as decabromodiphenyl ether; brominated polystyrene resins, brominated polycarbonate resins, brominated resins such as brominated epoxy resins, etc.); perfluoroalkanesulfonic acid metal salts, trihalobenzenesulfonic acid metal salts Halogen-containing organic acid metal salt flame retardants, etc.], phosphorous flame retardants {for example, inorganic phosphorus flame retardants (red phosphorus, etc.), organic phosphorus flame retardants [aromatic phosphate esters (condensed phosphate esters and Including halogenated aromatic phosphates), for example Tri (aryl) phosphates such as rephenyl phosphate or tri (alkyl substituted aryl) phosphates; arylene bis (aryl) phosphates such as resorcinol bis (diphenyl phosphate) or arylene bis (alkyl substituted aryl) phosphates; 4,4′-biphenol bis Bisphenol bis (aryl) phosphate such as (diphenyl phosphate) or bisphenol bis (alkyl-substituted aryl) phosphate]} and the like. These flame retardants can be used alone or in combination of two or more. Of these flame retardants, halogenated flame retardants (particularly brominated flame retardants) are widely used.

  The ratio of the flame retardant is, for example, 10 to 40% by weight with respect to the entire resin component [(A1) polyamide resin, (A2) polymer type antistatic agent, and (A3) total of other thermoplastic resins]. Preferably, it may be about 15 to 35% by weight.

  You may use a flame retardant in combination with a flame retardant adjuvant as needed. Suitable flame retardant aids for combination with halogenated flame retardants are antimony containing compounds. Examples of the antimony-containing compound include antimony oxides such as antimony trioxide and antimony pentoxide; and metal antimonate salts such as sodium antimonate. These antimony-containing compounds can be used alone or in combination of two or more. A preferred flame retardant aid is antimony oxide (particularly antimony trioxide).

  The ratio of the flame retardant aid can be selected from the range of about 1 to 100 parts by weight with respect to 100 parts by weight of the flame retardant, and may be, for example, about 10 to 40 parts by weight, preferably about 20 to 30 parts by weight. .

[Method for manufacturing paper conveying member]
The thermoplastic resin composition for forming the paper conveying member can be prepared by a conventional method, for example, by mixing each component. Specifically, it can be prepared by premixing each component with a mixer (such as a tumbler, V-type blender, or extrusion mixer) if necessary, and melt-kneading with a melt-kneader (such as a single-screw or twin-screw extruder). The melt kneading temperature may be a temperature equal to or higher than the melting point of the resin component, for example, 250 to 350 ° C, preferably about 260 to 340 ° C. When the melt-kneading temperature is in such a range, for example, the breakage of the ether bond of the polyamide-polyether block copolymer can be prevented. The melt-kneaded product may be pelletized by conventional pelletizing means (such as a pelletizer).

  The paper conveying member can be obtained by molding the thermoplastic resin composition. The molding method is not particularly limited, and examples thereof include injection molding, extrusion molding, blow molding, press molding, and insert molding. Molded products (primary molded products) obtained by such a molding method can be used for free blow molding, vacuum molding, bending, compressed air molding (compressed air pressure molding), match mold molding, hot plate molding, etc., if necessary. Secondary molding may be performed by conventional thermoforming. Of these molding methods, injection molding is preferred. In the present invention, although the thermoplastic resin composition contains a polyamide-based resin, the formation of burrs can be effectively suppressed by ordinary injection molding. Therefore, in the present invention, a step of removing burrs is unnecessary, and a paper conveying member having excellent surface smoothness can be manufactured with high productivity.

  The paper conveying member is usually a molded product having a guide portion (such as a recess, a guide groove or a guide wall) for guiding paper. The shape of the paper conveying member is not particularly limited, and may be a two-dimensional structure such as a film shape or a sheet shape, such as a three-dimensional shape (plate shape or the like) having a contact portion (or paper passing portion) with paper. It may be a three-dimensional structure.

Since the paper conveying member of the present invention is formed of the thermoplastic resin composition, it is excellent in antistatic properties, abrasion resistance, surface smoothness and the like. For example, the paper conveying member of the present invention has high antistatic properties, and the surface specific resistance value is, for example, 1 × 10 ⁹ to 1 × 10 ¹² Ω, preferably 2 × under conditions of a temperature of 23 ° C. and a humidity of 50%. 10 ^{9 to} 5 × 10 ¹¹ Ω, more preferably about 5 × 10 ⁹ to 1 × 10 ¹¹ Ω, and the volume specific resistance value is, for example, 1 × 10 ⁶ to 5 ° C. under conditions of a temperature of 23 ° C. and a humidity of 50%. It is about 5 × 10 ⁹ Ω · m, preferably about 2 × 10 ⁶ to 1 × 10 ⁹ Ω · m, and more preferably about 5 × 10 ^{6 to} 5 × 10 ⁸ Ω · m. Further, the paper conveying member of the present invention has a short charge decay rate, and is, for example, 0.3 seconds or less, preferably 0.2 seconds or less, more preferably 0.18, in accordance with the half-life measurement method of JIS L1094. Seconds or less (for example, detection limit to about 0.18 seconds). Furthermore, the paper conveying member of the present invention has high surface smoothness, and the glossiness as an index of surface smoothness is, for example, 70% or more, preferably 80% or more, more preferably 85, in accordance with JIS K7105. % Or more (for example, about 85 to 99%).

  The paper conveying member is an electronic device having a paper conveying part (or a paper passing part) as a composite molded body alone or in combination with a counterpart material [for example, a copying machine (especially a high-speed copying machine or a printing machine using an electronic system) ), Image forming apparatuses such as facsimiles, scanners, or composite machines thereof; paper feeders of printing presses (paper passing devices); bill counters such as automatic teller machines (ATMs), money changers, vending machines, It can be applied to components of a counting machine such as a voting paper counter.

  In the case of banknotes, the speed at which the paper passes through the paper passing portion of the paper conveying member (paper passing speed) is, for example, 0.1 to 5 m / second, preferably 0.3 to 3 m / second, and more preferably 0.5. In the case of paper other than banknotes, it is, for example, 0.1 to 10 m / second, preferably 0.5 to 8 m / second, and more preferably about 0.5 to 5 m / second. In the present invention, even if the paper passing speed is high, charging of the paper conveying parts can be prevented and wear can be suppressed, so that paper jams can be prevented and paper can be counted accurately.

  Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples. In addition, the evaluation method of each evaluation item in an Example, and the content of each used component are as follows.

[Tensile strength and tensile strain]
Tensile strength (tensile modulus, MPa) and tensile nominal strain (nominal strain at tensile failure,%) were measured by a method based on JIS K7113.

[Bending strength and flexural modulus]
The bending strength (MPa) and the flexural modulus (MPa) were measured by a method based on ISO178.

[Charpy impact value]
The Charpy impact value (kJ / m) was measured by a method based on ISO179.

[HDT (heat distortion temperature)]
HDT was measured under a load of 1.8 MPa in accordance with ISO75.

[specific gravity]
The specific gravity was measured by a method based on JIS K7112.

[Surface specific resistance]
The surface resistivity (Ω / □) was measured by a method based on JIS K6911.

[Volume resistivity]
The volume resistivity (Ω · m) was measured by a method based on JIS K7194.

[Bari]
The length of burrs when a molded product having a length of 120 mm × width of 120 mm × thickness of 3 mm was injection-molded at a mold temperature of 120 ° C. was measured with a digital microscope YHX-200 manufactured by Keyence Corporation. The burr length was the average of the values measured at three arbitrarily selected locations.

[Combustion quality]
A combustion test was performed on a test piece having a thickness of 1.5 mm in accordance with UL94 issued by US Underwriter Laboratories. In this combustion test, ignition was performed from the gate side of the test piece.

[Surface smoothness]
The surface smoothness was evaluated by measuring the glossiness by a method based on JIS K7105.

[Charging decay rate]
The charge decay rate (seconds) was measured according to the half-life measurement method of JIS L1094.

[Slidability]
Using a reciprocating friction and wear tester (Orientec, AFT-15MS, movable speed 50 mm / second, stroke (reciprocating length) 100 mm), a piece of paper affixed to the tip of a cylindrical metal piece (10 mmφ) with double-sided tape, A load of 100 g was applied, and the specimen was reciprocated 5000 times on the test piece (90 mm × 50 mm × 3 mm). In addition, as a piece of paper, a piece of paper obtained by cutting one page of a paperback on which an alphabet with a font size of 10 was printed to a predetermined size was used.

The slidability was evaluated by the worn state of the paper piece after reciprocating sliding. Specifically, the degree of shaving (or the degree of rubbing) of about 15 to 20 characters in the back surface (within a circle of 10 mmφ) of the surface of the paper piece that contacts the cylindrical metal piece is evaluated according to the following criteria. The average value (average value for all characters and average value for scraped characters) was calculated and evaluated.
Score (level) "0" ... Scratch of characters is not visually recognized. Score (level) "1". Score (level) "2": slight shaving of characters is recognized. Score (level) “3”: The character is sharply cut, but the character can be discriminated. Score (level) “4”: The character is sharply cut, and the character cannot be discriminated.

[Content of each component]
Polyamide resin (Unitika Ltd., UN1020, polyamide 6)
Styrene resin 1 (Technopolymer Co., Ltd., DPG168, ABS resin)
Styrene resin 2 (Technopolymer Co., Ltd., DPT651, carboxylic acid modified ABS resin)
Polymer antistatic agent 1 (manufactured by Sanyo Chemical Industries, polyether ester amide, perestat NC6321)
Polymer antistatic agent 2 (manufactured by Sanyo Chemical Industries, polyether ester amide, perestat HC6800)
Flame retardant (manufactured by Albemarle Japan Ltd., brominated flame retardant, SITEX S8010)
Flame retardant aid (manufactured by Toko Sangyo Co., Ltd., antimony trioxide, APP)
Filler (manufactured by NSG Vetrotex Co., Ltd., glass fiber, RES03-TP27, average fiber diameter 13 μm, average fiber length 7 mm).

Examples 1-5 and Comparative Examples 1-15
Each component was melt-kneaded with a melt kneader (manufactured by Nippon Steel Works, twin screw extruder, TEX30α) at the ratio shown in Tables 1 to 3 and pelletized. A test piece was prepared by injection-molding this pellet with an injection molding machine (SH-NIV-1 • 100, manufactured by Sumitomo Heavy Industries, Ltd.). The results are shown in Tables 1-4.

  In Table 4, each numerical value indicated by a symbol “* 1 to * 5” is a character scraping degree, S indicated by a symbol “* 6” is S = n1 + n2 + n3 + n4, and n indicated by a symbol “* 7”. (All) is n (all) = S / N (all), and n (wear) indicated by a symbol “* 8” is n (wear) = S / N (wear).

  As is apparent from Tables 1 to 4, the surface resistivity and volume resistivity are small and the charge decay time is short in the example as compared with the comparative example, so that the antistatic property is excellent. Moreover, in an Example, it is excellent in surface smoothness and the production | generation of a burr | flash is also suppressed effectively.

  Since the paper conveying member of the present invention is excellent in antistatic property, abrasion resistance, and surface smoothness, an electronic device [for example, a copying machine (especially a high-speed copying machine) having a contact portion (or a paper passing portion) with paper. Or printing machines using electronic systems), printers, scanners, facsimiles, or multi-function printers such as these; banknote counters such as automatic teller machines (ATMs), money changers, vending machines, voting paper It can be suitably used as a part used in a number counter such as a counter.

Claims (10)

A paper conveying member formed of a thermoplastic resin composition comprising a polyamide resin, a polymer antistatic agent, a styrene resin, and a filler ,
The styrene resin includes a graft copolymer in which at least an aromatic vinyl monomer is graft-polymerized to a rubber component, and the content of the graft copolymer is 1 to 50 parts by weight with respect to 100 parts by weight of the polyamide resin. And
A paper conveying member in which the filler contains glass fibers, and the ratio of the glass fibers is 10 to 70 parts by weight with respect to 100 parts by weight of the entire resin component of the polyamide resin, the polymer antistatic agent, and the styrene resin .   2. The paper conveying member according to claim 1, wherein the polymer type antistatic agent is a polyamide elastomer.   The paper conveying member according to claim 2, wherein the polyamide elastomer is a polyether ester amide. The content of the glass fiber is 20 to 70 parts by weight with respect to 100 parts by weight of the entire resin component, and the content of the graft copolymer is 5 to 40 parts by weight with respect to 100 parts by weight of the polyamide resin. The paper conveyance member in any one of Claims 1-3 . The weight average fiber length of glass fiber, paper conveying member according to any one of claims 1 to 4 is 0.01 to 10 mm.   The proportion of the polymer type antistatic agent is 10 to 150 parts by weight with respect to 100 parts by weight of the polyamide resin, and the proportion of the filler is 10 to 50% by weight with respect to the entire thermoplastic resin composition. The paper conveyance member in any one of Claims 1-5. The styrene-based resin is a graft copolymer obtained by graft-polymerizing at least an aromatic vinyl monomer, a vinyl cyanide monomer, and / or a (meth) acrylic monomer to a rubber component . The paper carrying member according to any one of 6 . The thermoplastic resin composition, the paper transport member according to any one of claims 1 to 7 further comprising a flame retardant. The method to manufacture a paper conveyance member by shape | molding the thermoplastic resin composition in any one of Claims 1-8 containing a polyamide resin, a polymeric antistatic agent, a styrene resin, and a filler. The surface of a paper conveyance member by shape | molding a paper conveyance member with the thermoplastic resin composition in any one of Claims 1-8 containing a polyamide resin, a polymeric antistatic agent, a styrene resin, and a filler. A method for improving smoothness.