JP5743937B2 - Stirring member - Google Patents

Description

  The present invention relates to a stirring member used for stirring a developer containing toner.

As shown in FIG. 1, an agitating screw 200 is provided as an agitating member in the toner cartridge 100 of an electrophotographic copying machine or printer in order to agitate a developer containing toner inside (for example, (See Patent Documents 1 and 2).
As shown in FIG. 1, the stirring screw 200 is provided with, for example, a screw portion 211 having a spiral shape or a blade shape so as to protrude outward from the rotating shaft portion 210, and both ends of the rotating shaft portion 210 are connected to the casing. The bearing unit 110 is rotatably supported.

Further, as shown in FIG. 2, as the stirring screw 200, when the screw body 201 is formed by injection molding a thermoplastic resin composition to which a filler such as mica is added, a bearing portion of the rotary shaft portion 210 is formed. A metal collar 300 is inserted into the receiving part.
That is, the stirring screw 200 increases the wear strength at the bearing portion of the rotating shaft portion 210 by forming the outer peripheral surface of the portion received by the bearing portion of the casing 110 having a large frictional resistance due to rotation with the metal collar 300, Ensures durability.

JP-A-7-253706 JP-A-8-190268

However, although the metal collar 300 portion generates heat due to the rotation of the stirring screw 200, the heat of the metal collar 300 portion is difficult to escape because the thermal conductivity of the thermoplastic resin composition constituting the screw body 201 is poor.
That is, when the frequency of use of a printer, a copying machine, or the like is high, the metal color 300 portion becomes extremely hot, and there is a possibility that the toner existing in the vicinity of the metal color 300 may be altered.

Therefore, it is necessary to provide a large number of cooling means such as fans in the printer and copying machine, which is an obstacle to downsizing and cost reduction of the printer and copying machine.
In recent years, the toner has been fixing at low temperatures to meet the needs of energy saving driving, so that not only the heat dissipation performance of the frictional heat with the bearing part of the stirring screw but also the heat generation due to the frictional resistance with the toner at the screw part. There is a demand for reducing heat dissipation easily.

  In view of the above circumstances, an object of the present invention is to provide an agitating member that easily dissipates frictional heat generated by agitation and that hardly damages or aggregates toner by agitation blades.

In order to achieve the above object, a stirring member according to the present invention has a rod-shaped rotating shaft portion and a stirring blade portion provided so as to project outward from the periphery of the rotating shaft portion, and at least a toner. And the entire stirring member is formed by injection molding a thermoplastic resin composition, and the thermoplastic resin composition has a thermal conductivity measured by a laser flash method. A hollow cylindrical specimen having an inner diameter of 2.00 cm, an outer diameter of 2.56 cm, and a height of 1.5 cm using a JIS K 7218 A method tester of 0.8 W / m · k or more and S45C carbon The limit PV value obtained by bringing the mating material into contact with the end face of the mating steel and sliding the mating material at a peripheral speed of 20 cm / sec at room temperature and applying a test load stepwise is 100 kgf / cm · sec or more. A stirring member having certain physical properties, the heatable The plastic resin composition includes a polycarbonate resin, an acrylonitrile-styrene copolymer resin, and graphite .

In the present invention, the thermoplastic resin composition is limited to a thermal conductivity of 0.8 W / m · k or more because the thermal conductivity is less than 0.8 W / m · k, Alternatively, it is difficult to dissipate heat generated in the bearing portion through the stirring blade portion, and toner is aggregated by heat generated by friction in the stirring blade portion.
The thermal conductivity of the thermoplastic resin composition is not particularly limited as long as it is 0.8 W / m · k or more, but 0.8 to 12.0 W / m · k is preferable, and 1.0 to 7. 0 W / m · k is more preferable.

The thermoplastic resin composition used in the present invention is a hollow cylindrical test piece having an inner diameter of 2.00 cm, an outer diameter of 2.56 cm, and a height of 1.5 cm using a JIS K 7218 A method tester. The limit obtained by bringing the test material made of the thermoplastic resin composition and the end surfaces of the S45C carbon steel mating members into contact with each other, sliding at a peripheral speed of 20 cm / sec at room temperature, and applying the test load in stages. The PV value is limited to 100 kgf / cm · sec or more. The reason is that if the limit PV value is less than 100 kgf / cm · sec, the frictional resistance with the developer is large and the frictional heat causes This is because the toner easily aggregates and the durability (damage due to wear) of the stirring member itself deteriorates.
The limit PV value of the thermoplastic resin composition is not particularly limited as long as it is 100 kgf / cm · sec or more, but is preferably 500 kgf / cm · sec or more, more preferably 600 kgf / cm · sec or more.

  Further, the PV value is a product of the contact pressure (P) speed (V) between the surfaces, and the limit PV value is, for example, while applying a constant surface pressure to the surface of the molded product such as a square plate, The product of the speed and surface pressure of the mating material when abnormal damage occurs in the surface where the molded material contacts the mating material by rotating and contacting the hollow cylindrical mating material made of steel at a constant speed.

  The thermoplastic resin as the main component of the thermoplastic resin composition is not particularly limited. For example, styrene resins such as polypropylene resin, AS resin, ABS resin, modified polyphenylene oxide resin, polyamide resin, polycarbonate resin, polyphenylene Examples include ether resins, polyphenylene sulfide resins, polyester resins such as polyethylene terephthalate, polyarylate resins, polyester elastomers, polyamide elastomers, thermoplastic elastomers such as acrylic elastomers, and the like, and these resins may be mixed. Among them, a thermoplastic resin containing 50% by weight or more of a polycarbonate resin is preferable, preferably a thermoplastic resin containing 60% by weight or more, more preferably 70% by weight or more.

Such a polycarbonate resin may be various polycarbonate resins having a high heat resistance or a low water absorption, which are polymerized using other dihydric phenols, in addition to the commonly used bisphenol A type polycarbonate. The polycarbonate resin may be produced by any production method, and in the case of interfacial polycondensation, a terminal stopper of a monohydric phenol is usually used. The polycarbonate resin may also be a branched polycarbonate resin obtained by polymerizing trifunctional phenols, and further a copolymer obtained by copolymerizing an aliphatic dicarboxylic acid, an aromatic dicarboxylic acid, or a divalent aliphatic or alicyclic alcohol. Polycarbonate may be used. The viscosity average molecular weight of the polycarbonate resin is preferably 13,000 to 40,000, more preferably 15,000 to 38,000. The viscosity average molecular weight (M) of the aromatic polycarbonate resin is obtained by inserting the specific viscosity (ηsp) obtained at 20 ° C. from a solution of 0.7 g of the polycarbonate resin in 100 ml of methylene chloride into the following equation. Details of the polycarbonate resin are described in JP-A No. 2002-129003.
ηsp / c = [η] + 0.45 × [η] 2c (where [η] is the intrinsic viscosity)
[Η] = 1.23 × 10 −4 M0.83
c = 0.7

As specific examples of various polycarbonate resins polymerized using other dihydric phenols and having high heat resistance or low water absorption, the following can be suitably exemplified.
(1) In 100 mol% of the dihydric phenol component constituting the polycarbonate, 4,4 '-(m-phenylenediisopropylidene) diphenol (hereinafter abbreviated as "BPM") component is 20 to 80 mol% (more preferable) 40 to 75 mol%, more preferably 45 to 65 mol%), and 9,9-bis (4-hydroxy-3-methylphenyl) fluorene (hereinafter abbreviated as "BCF") component is 20 to 20 mol. Copolycarbonate which is 80 mol% (more preferably 25 to 60 mol%, more preferably 35 to 55 mol%).
(2) In 100 mol% of the dihydric phenol component constituting the polycarbonate, the bisphenol A component is 10 to 95 mol% (more preferably 50 to 90 mol%, more preferably 60 to 85 mol%), And a BCF component in an amount of 5 to 90 mol% (more preferably 10 to 50 mol%, and still more preferably 15 to 40 mol%).
(3) In 100 mol% of the dihydric phenol component constituting the polycarbonate, the BPM component is 20 to 80 mol% (more preferably 40 to 75 mol%, more preferably 45 to 65 mol%), and The 1,1-bis (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane component is 20 to 80 mol% (more preferably 25 to 60 mol%, more preferably 35 to 55 mol%). Copolycarbonate.

  These special polycarbonates may be used alone or in combination of two or more. Moreover, these can also be mixed and used for the bisphenol A type polycarbonate generally used.

The thermoplastic resin composition used in the present invention is blended with a filler for imparting thermal conductivity having high thermal conductivity for the purpose of imparting thermal conductivity.
The filler for imparting thermal conductivity is not particularly limited, but metal oxides such as aluminum oxide, boron nitride, aluminum nitride, silicon nitride, magnesium oxide, zinc oxide, silicon carbide, quartz, and aluminum hydroxide, metal nitrides , Metal carbide, metal hydroxide, graphite and the like, and graphite is preferable.

When graphite is used as the filler for imparting thermal conductivity, the blending amount is not particularly limited, but is preferably 5 to 30 parts by weight with respect to 100 parts by weight of the thermoplastic resin, and 5 to 20 parts by weight. Is more preferable, and 5 to 15 parts by weight is particularly preferable. That is, if the blending amount of graphite is too small, the thermal conductivity of the present invention cannot be achieved, and if it is too large, there may be a problem in moldability.
In addition, the graphite is not particularly limited, and examples thereof include natural phosphorus graphite, pyrolytic graphite, and quiche graphite.
Although it does not specifically limit as a particle diameter of graphite, 8 micrometers-1000 micrometers are preferable. That is, if the particle size of graphite is too small, the extrusion stability during the production of the thermoplastic resin composition is poor and the productivity is lowered, and if the particle size is too large, the appearance of the surface of the molded product may be deteriorated.

  The method for setting the limit PV value to 100 kgf / cm · sec or more is not particularly limited, but can be achieved by blending 5 parts by weight or more of the above graphite.

  Further, the thermoplastic resin composition, in addition to the filler for imparting thermal conductivity, within a range that does not impair the purpose of the present invention, if necessary, improved rigidity, reduced frictional resistance, improved weather resistance, The following other additives can be added for the purpose of improving thermal stability and imparting flame retardancy.

[Other additives]
(1) Inorganic fillers Inorganic fillers are used to improve rigidity and are not particularly limited. For example, inorganic fillers such as mica, talc and wollastonite, glass fibers, glass milled fibers, carbon Examples thereof include fibrous fillers such as fibers and metal-coated carbon fibers, and these may be used alone or in combination.

(2) Lubricant Lubricant is used for reducing frictional resistance, and is not particularly limited. For example, olefin wax, esterified product of higher fatty acid (for example, aliphatic carboxylic acid having 16 to 60 carbon atoms), polymerization degree 10 Examples include about -200 polyalkylene glycol, silicone oil, and fluorocarbon oil. Examples of the olefin wax include paraffin wax, microcrystalline wax, Fischer-Tropsch wax, and α-olefin polymer.

(3) Phosphorus stabilizers Phosphorus stabilizers are used to impart even better rigidity and thermal stability. For example, phosphorous acid, phosphoric acid, phosphonous acid, phosphonic acid, and esters thereof can be used. Can be mentioned.
Specifically, as the phosphite compound, for example, triphenyl phosphite, tris (nonylphenyl) phosphite, tridecyl phosphite, trioctyl phosphite, trioctadecyl phosphite, didecyl monophenyl phosphite, dioctyl monophenyl Phosphite, diisopropyl monophenyl phosphite, monobutyl diphenyl phosphite, monodecyl diphenyl phosphite, monooctyl diphenyl phosphite, 2,2-methylenebis (4,6-di-tert-butylphenyl) octyl phosphite, tris ( Diethylphenyl) phosphite, tris (di-iso-propylphenyl) phosphite, tris (di-n-butylphenyl) phosphite, tris (2,4-di-tert-butylpheny) ) Phosphite, tris (2,6-di-tert-butylphenyl) phosphite, distearyl pentaerythritol diphosphite, bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite, bis (2 , 6-Di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, bis (2,6-di-tert-butyl-4-ethylphenyl) pentaerythritol diphosphite, phenylbisphenol A pentaerythritol diphosphite Phyto, bis (nonylphenyl) pentaerythritol diphosphite, dicyclohexyl pentaerythritol diphosphite, and the like.
Further, as other phosphite compounds, those which react with dihydric phenols and have a cyclic structure can be used. For example, 2,2′-methylenebis (4,6-di-tert-butylphenyl) (2,4-di-tert-butylphenyl) phosphite, 2,2′-methylenebis (4,6-di-tert- Butylphenyl) (2-tert-butyl-4-methylphenyl) phosphite, 2,2′-methylenebis (4-methyl-6-tert-butylphenyl) (2-tert-butyl-4-methylphenyl) phosphite 2,2′-ethylidenebis (4-methyl-6-tert-butylphenyl) (2-tert-butyl-4-methylphenyl) phosphite.
Examples of the phosphate compound include tributyl phosphate, trimethyl phosphate, tricresyl phosphate, triphenyl phosphate, trichlorophenyl phosphate, triethyl phosphate, diphenyl cresyl phosphate, diphenyl monoorxenyl phosphate, tributoxyethyl phosphate, dibutyl phosphate, dioctyl phosphate, Examples thereof include diisopropyl phosphate, and triphenyl phosphate and trimethyl phosphate are preferable.
Examples of the phosphonite compound include tetrakis (2,4-di-tert-butylphenyl) -4,4′-biphenylenediphosphonite, tetrakis (2,4-di-tert-butylphenyl) -4,3′-biphenylenedi. Phosphonite, tetrakis (2,4-di-tert-butylphenyl) -3,3′-biphenylenediphosphonite, tetrakis (2,6-di-tert-butylphenyl) -4,4′-biphenylenediphosphonite Tetrakis (2,6-di-tert-butylphenyl) -4,3′-biphenylene diphosphonite, tetrakis (2,6-di-tert-butylphenyl) -3,3′-biphenylene diphosphonite, bis (2,4-di-tert-butylphenyl) -4-phenyl-phenylphosphonite, bis (2,4-di-ter -Butylphenyl) -3-phenyl-phenylphosphonite, bis (2,6-di-n-butylphenyl) -3-phenyl-phenylphosphonite, bis (2,6-di-tert-butylphenyl) -4 -Phenyl-phenylphosphonite, bis (2,6-di-tert-butylphenyl) -3-phenyl-phenylphosphonite, and the like, and tetrakis (di-tert-butylphenyl) -biphenylenediphosphonite, bis ( Di-tert-butylphenyl) -phenyl-phenylphosphonite is preferred, tetrakis (2,4-di-tert-butylphenyl) -biphenylenediphosphonite, bis (2,4-di-tert-butylphenyl) -phenyl -Phenylphosphonite is more preferred. Such a phosphonite compound is preferable because it can be used in combination with a phosphite compound having an aryl group in which two or more alkyl groups are substituted.
Examples of the phosphonate compound include dimethyl benzenephosphonate, diethyl benzenephosphonate, and dipropyl benzenephosphonate.
In addition, the said phosphorus stabilizer can be used not only 1 type but in mixture of 2 or more types. Among the phosphorus stabilizers, phosphite compounds or phosphonite compounds are preferable. In particular, a phosphite compound typified by trimethyl phosphite is preferably blended.

(4) Flame retardant Examples of the flame retardant include organic halogen flame retardants and phosphate ester flame retardants.
Organic halogen flame retardants include halogenated carbonate oligomers, halogenated epoxy compounds, halogenated polystyrene, halogenated triazine compounds, halogenated diphenylalkane compounds, halogenated indane compounds, and halogenated aromatic phthalimide compounds. Among them, a halogenated carbonate oligomer and a halogenated epoxy compound are preferable because they are excellent in compatibility with polycarbonate and have good heat resistance and thermal stability.
As the phosphorus-based flame retardant, phosphate esters, phosphonate esters, phosphazene oligomers, and the like are preferable.

(5) Fluorine-containing anti-drip agent Examples of the fluorine-containing anti-drop agent include a fluorine-containing polymer having a fibril-forming ability. Examples of such a polymer include polytetrafluoroethylene and tetrafluoroethylene copolymers (for example, tetra Fluoroethylene / hexafluoropropylene copolymer, etc.), partially fluorinated polymers as shown in US Pat. No. 4,379,910, polycarbonate resin produced from fluorinated diphenol, and the like. Among them, polytetrafluoroethylene (hereinafter sometimes referred to as PTFE) is preferable.
PTFE having a fibril forming ability has a very high molecular weight, and tends to be bonded to each other by an external action such as shearing force to form a fiber. The molecular weight is 1 million to 10 million, more preferably 2 million to 9 million in the number average molecular weight determined from the standard specific gravity. Such PTFE can be used in solid form or in the form of an aqueous dispersion. In addition, PTFE having such fibril forming ability can improve the dispersibility in the resin, and it is also possible to use a PTFE mixture in a mixed form with other resins in order to obtain better flame retardancy and mechanical properties. is there.
Examples of commercially available PTFE having such fibril forming ability include Teflon (registered trademark) 6J from Mitsui DuPont Fluorochemical Co., Ltd., Polyflon MPA FA500 and F-201L from Daikin Industries, Ltd. Commercially available PTFE aqueous dispersions include Asahi IC Fluoropolymers' full-on AD-1, AD-936, Daikin Kogyo's full-on D-1 and D-2, Mitsui Dupont Fluoro A typical example is Teflon (registered trademark) 30J manufactured by Chemical Corporation.
As a mixed form of PTFE, (a) a method in which an aqueous dispersion of PTFE and an aqueous dispersion or solution of an organic polymer are mixed and co-precipitated to obtain a co-aggregated mixture (Japanese Patent Laid-Open No. 60-258263; (A method described in JP-A-63-154744), (b) a method of mixing an aqueous dispersion of PTFE and dried organic polymer particles (a method described in JP-A-4-272957), (C) A method of uniformly mixing an aqueous dispersion of PTFE and an organic polymer particle solution, and simultaneously removing each medium from the mixture (described in JP-A-06-220210, JP-A-08-188653, etc.) And (d) a method of polymerizing monomers forming an organic polymer in an aqueous dispersion of PTFE (a method described in JP-A-9-95583), and (e) A method in which an aqueous dispersion of TFE and an organic polymer dispersion are uniformly mixed, and a vinyl monomer is further polymerized in the mixture dispersion, and then a mixture is obtained (described in JP-A-11-29679, etc.). Those obtained by (Method) can be used. Examples of commercially available PTFE in a mixed form include “Metablene A3000” (trade name) manufactured by Mitsubishi Rayon Co., Ltd. and “BLENDEX B449” (trade name) manufactured by GE Specialty Chemicals.

(6) Hindered phenol stabilizers Hindered phenol stabilizers are used, for example, to prevent hue deterioration during molding processing and hue deterioration during long-term use, such as α-tocopherol, butyl. Hydroxytoluene, sinapyl alcohol, vitamin E, n-octadecyl-β- (4′-hydroxy-3 ′, 5′-di-tert-butylfell) propionate, 2-tert-butyl-6- (3′-tert- Butyl-5'-methyl-2'-hydroxybenzyl) -4-methylphenyl acrylate, 2,6-di-tert-butyl-4- (N, N-dimethylaminomethyl) phenol, 3,5-di-tert -Butyl-4-hydroxybenzylphosphonate diethyl ester, 2,2'-methylenebis (4-methyl-6-tert- Tilphenol), 2,2′-methylenebis (4-ethyl-6-tert-butylphenol), 4,4′-methylenebis (2,6-di-tert-butylphenol), 2,2′-methylenebis (4-methyl) -6-cyclohexylphenol), 2,2'-dimethylene-bis (6-α-methyl-benzyl-p-cresol) 2,2'-ethylidene-bis (4,6-di-tert-butylphenol), 2, 2'-butylidene-bis (4-methyl-6-tert-butylphenol), 4,4'-butylidenebis (3-methyl-6-tert-butylphenol), triethylene glycol-N-bis-3- (3-tert -Butyl-4-hydroxy-5-methylphenyl) propionate, 1,6-hexanediol bis [3- (3,5-di-te t-butyl-4-hydroxyphenyl) propionate], bis [2-tert-butyl-4-methyl 6- (3-tert-butyl-5-methyl-2-hydroxybenzyl) phenyl] terephthalate, 3,9-bis {2- [3- (3-tert-Butyl-4-hydroxy-5-methylphenyl) propionyloxy] -1,1, -dimethylethyl} -2,4,8,10-tetraoxaspiro [5,5 ] Undecane, 4,4′-thiobis (6-tert-butyl-m-cresol), 4,4′-thiobis (3-methyl-6-tert-butylphenol), 2,2′-thiobis (4-methyl-) 6-tert-butylphenol), bis (3,5-di-tert-butyl-4-hydroxybenzyl) sulfide, 4,4′-di-thiobis (2,6- -Tert-butylphenol), 4,4'-tri-thiobis (2,6-di-tert-butylphenol), 2,2-thiodiethylenebis- [3- (3,5-di-tert-butyl-4- Hydroxyphenyl) propionate], 2,4-bis (n-octylthio) -6- (4-hydroxy-3 ', 5'-di-tert-butylanilino) -1,3,5-triazine, N, N'- Hexamethylene bis- (3,5-di-tert-butyl-4-hydroxyhydrocinnamide), N, N′-bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyl] Hydrazine, 1,1,3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, 1,3,5-trimethyl-2,4,6-tris (3,5-di- ert-butyl-4-hydroxybenzyl) benzene, tris (3,5-di-tert-butyl-4-hydroxyphenyl) isocyanurate, tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate 1,3,5-tris (4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl) isocyanurate, 1,3,5-tris 2 [3 (3,5-di-tert-butyl- 4-hydroxyphenyl) propionyloxy] ethyl isocyanurate, and tetrakis [methylene-3- (3 ′, 5′-di-tert-butyl-4-hydroxyphenyl) propionate] methane.

(7) Ultraviolet absorber Examples of the ultraviolet absorber include 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-benzyloxybenzophenone, 2-hydroxy-4-methoxy-5-sulfoxybenzophenone, 2-hydroxy-4-methoxy-5-sulfoxytrihydridolate benzophenone, 2,2'-dihydroxy-4-methoxybenzophenone, 2,2 ', 4 4'-tetrahydroxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxy-5-sodiumsulfoxybenzophenone, bis (5-benzoyl- 4-hydroxy-2-methoxyphenyl) Down, 2-hydroxy -4-n-dodecyloxy benzoin phenone, and 2-hydroxy-4-methoxy-2'-carboxy specifically, benzophenone ultraviolet absorbents such as benzophenone,
2- (2-hydroxy-5-methylphenyl) benzotriazole, 2- (2-hydroxy-5-tert-octylphenyl) benzotriazole, 2- (2-hydroxy-3,5-dicumylphenyl) phenyl Benzotriazole, 2- (2-hydroxy-3-tert-butyl-5-methylphenyl) -5-chlorobenzotriazole, 2,2′-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol], 2- (2-hydroxy-3,5-di-tert-butylphenyl) benzotriazole, 2- (2-hydroxy-3,5-di -Tert-butylphenyl) -5-chlorobenzotriazole, 2- (2-hydroxy-3,5-di-tert-amylphenyl) ben Zotriazole, 2- (2-hydroxy-5-tert-octylphenyl) benzotriazole, 2- (2-hydroxy-5-tert-butylphenyl) benzotriazole, 2- (2-hydroxy-4-oct Xylphenyl) benzotriazole, 2,2′-methylenebis (4-cumyl-6-benzotriazolephenyl), 2,2′-p-phenylenebis (1,3-benzoxazin-4-one), and 2- [2-Hydroxy-3- (3,4,5,6-tetrahydrophthalimidomethyl) -5-methylphenyl] benzotriazole, and 2- (2'-hydroxy-5-methacryloxyethylphenyl) -2H-benzo Copolymers of triazole and vinyl monomers copolymerizable with the monomers and 2- (2′-hydroxy-5-acrylo) Benzotriazole-based UV absorbers such as a polymer having a 2-hydroxyphenyl-2H-benzotriazole skeleton, such as a copolymer of xylethylphenyl) -2H-benzotriazole and a vinyl monomer copolymerizable with the monomer,
2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-hexyloxyphenol, 2- (4,6-diphenyl-1,3,5-triazin-2-yl)- 5-methyloxyphenol, 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-ethyloxyphenol, 2- (4,6-diphenyl-1,3,5-triazine Examples include 2-yl) -5-propyloxyphenol and 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-butyloxyphenol. Furthermore, the phenyl group of the above exemplary compounds such as 2- (4,6-bis (2,4-dimethylphenyl) -1,3,5-triazin-2-yl) -5-hexyloxyphenol is 2,4-dimethyl. Hydroxyphenyltriazine-based UV absorbers such as compounds with phenyl groups,
2,2'-p-phenylenebis (3,1-benzoxazin-4-one), 2,2'-m-phenylenebis (3,1-benzoxazin-4-one), and 2,2'- cyclic iminoester-based ultraviolet absorbers such as p, p′-diphenylenebis (3,1-benzoxazin-4-one),
1,3-bis-[(2′-cyano-3 ′, 3′-diphenylacryloyl) oxy] -2,2-bis [(2-cyano-3,3-diphenylacryloyl) oxy] methyl) propane, and Cyanoacrylate ultraviolet absorbers such as 1,3-bis-[(2-cyano-3,3-diphenylacryloyl) oxy] benzene;
By taking the structure of a monomer compound capable of radical polymerization, the ester substituent of (meth) acrylic ester contains a benzotriazole skeleton, benzophenone skeleton, triazine skeleton, cyclic imino ester skeleton, and cyanoacrylate skeleton Examples thereof include a polymer-type ultraviolet absorber obtained by copolymerizing an ultraviolet-absorbing monomer such as a compound and / or a light-stable monomer and a monomer such as an alkyl (meth) acrylate.

(8) Light stabilizer Examples of the light stabilizer include bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate and bis (1,2,2,6,6-pentamethyl-4-piperidyl). ) Sebacate, tetrakis (2,2,6,6-tetramethyl-4-piperidyl) -1,2,3,4-butanetetracarboxylate, tetrakis (1,2,2,6,6-pentamethyl-4- Piperidyl) -1,2,3,4-butanetetracarboxylate, poly {[6- (1,1,3,3-tetramethylbutyl) amino-1,3,5-triazine-2,4-diyl] [(2,2,6,6-tetramethylpiperidyl) imino] hexamethylene [(2,2,6,6-tetramethylpiperidyl) imino]}, and polymethylpropyl 3-oxy- [4- (2, 2, 6, 6 Hindered amine light stabilizers typified by -tetramethyl) piperidinyl] siloxane and the like.
(9) Other additives Sliding agent (for example, PTFE particles), colorant (for example, pigments and dyes such as carbon black and titanium oxide), light diffusing agent (for example, acrylic crosslinked particles, silicon crosslinked particles, ultrathin glass flakes, carbonic acid) Calcium particles), fluorescent dyes, inorganic phosphors (for example, phosphors having aluminate as a base crystal), fluorescent whitening agents, antistatic agents, inorganic and organic antibacterial agents, photocatalytic antifouling agents (for example, particulate oxidation (Titanium, fine particle zinc oxide), radical generator, infrared absorber (heat ray absorber), photochromic agent and the like.

As described above, the stirring member according to the present invention has the rod-shaped rotating shaft portion and the stirring blade portion provided so as to project outward from the periphery of the rotating shaft portion, and includes at least toner. It is used for at least stirring of the agent, and the entire stirring member is formed by injection molding of the thermoplastic resin composition, and the thermoplastic resin composition has a thermal conductivity of 0. 0 measured by a laser flash method. A hollow cylindrical specimen having an inner diameter of 2.00 cm, an outer diameter of 2.56 cm, and a height of 1.5 cm is formed of carbon steel of S45C using a JIS K 7218 A method tester of 8 W / m · k or more. The physical properties are such that the limit PV value obtained by bringing the mating material into contact with the end face of the mated material, sliding the mating material at a peripheral speed of 20 cm / sec at room temperature, and applying a test load in stages is 100 kgf / cm · sec or more. A stirring member comprising the thermoplastic resin composition Since the product contains polycarbonate resin, acrylonitrile-styrene copolymer resin, and graphite, the frictional heat generated in the bearing portion is easily radiated through the rotating shaft portion, and by stirring the developer such as toner Friction heat generated between the developer and the developer is reduced, and the developer such as toner is less likely to be damaged or aggregated by the stirring blade portion.

FIG. 3 is a schematic diagram illustrating an example of a toner cartridge provided with a stirring screw. It is a principal part enlarged view explaining an example of a stirring screw. It is a partial notch front view explaining the testing machine which measures a limit PV value. It is a schematic explanatory drawing of the apparatus which investigates the temperature rise of the bearing part vicinity of the rotating shaft part of the stirring member sample produced by the Example and the comparative example. It is a schematic explanatory drawing of the apparatus which investigates the temperature rise of the developer at the time of stirring using the stirring member sample produced in the Example and the comparative example.

Hereinafter, specific examples of the present invention will be described in detail together with comparative examples.
Thermoplastic resin compositions A to E were prepared.
(Thermoplastic resin composition A)
Idemitsu Kosan Co., Ltd. carbon fiber reinforced PPS (polyphenylene sulfide) resin composition (trade name T121 J1)
(Thermoplastic resin composition B)
PC / AS + mica general grade made by Teijin Chemicals Ltd. (trade name: Multilon DN1530B)
(Thermoplastic resin composition C)
PC general grade (trade name Panlite LV2225Y) manufactured by Teijin Chemicals Ltd. with 60% aluminum oxide added (thermoplastic resin composition D)
PC sliding grade (product Panlite LS2250) manufactured by Teijin Chemicals Ltd.
(Thermoplastic resin composition E)
Contains 65 parts by weight of PC, 10 parts by weight of ABS, and 10 parts by weight of graphite (thermoplastic resin composition F)
Includes 65 parts by weight of PC, 10 parts by weight of ABS, 10 parts by weight of graphite, and 5 parts by weight of PTFE (polyflon MPA from Daikin Industries, Ltd.)

Table 1 shows the thermal conductivity of the thermoplastic resin compositions A to F and the limit PV value when S45C steel is used as the counterpart material.
The thermal conductivity and the limit PV value were measured as follows.

〔Thermal conductivity〕
A sample (50 mm x 100 mm x 4 mm square plate) was molded with an injection molding machine (Toshiba Machine Co., Ltd .: IS-150EN) at a cylinder temperature of 300 ° C and a mold temperature of 80 ° C, and the thermal conductivity in the flow direction of the sample Was measured by a laser flash method.
[Limit PV value]
A cylindrical test piece (inner diameter: 2.00 cm, outer diameter: 2.56 cm, height: 1.5 cm) 2 shown in FIG. 3 is cut out from a tubular molded body injection-molded using the thermoplastic resin compositions A to D. Set the test piece 2 and the S45C steel mating material 3 on the wear friction tester (EFM-III-EN) 1 manufactured by Orientec Co., Ltd., with a surface area of 2 cm ² and a peripheral speed of 20 cm / sec. The limit PV value was obtained by sliding the test load stepwise and applying a test load stepwise.

( Reference Example 1)
Using only the thermoplastic resin composition A, as shown in FIG. 3 or FIG. 4, except for both ends of the rotating shaft portion (round bar shape of length 100 mm, diameter 6 mm) 41, the periphery of the rotating shaft portion 41 A stirring member sample 4 having a spiral stirring blade part (blade part outer diameter 14 mm, spiral pitch 25 mm) 42 was prepared by injection molding.

(Comparative Example 1)
A stirring member sample 4 was produced in the same manner as in Example 1 except that the thermoplastic resin composition B was used.

(Comparative Example 2)
A stirring member sample 4 was produced in the same manner as in Example 1 except that the thermoplastic resin composition C was used.

(Comparative Example 3)
A stirring member sample 4 was produced in the same manner as in Example 1 except that the thermoplastic resin composition D was used.
(Example 1 )
A stirring member sample 4 was produced in the same manner as in Example 1 except that the thermoplastic resin composition E was used.
(Example 2 )
A stirring member sample 4 was produced in the same manner as in Example 1 except that the thermoplastic resin composition F was used.

With respect to the stirring member sample 4 obtained in Examples 1 and 2 and Reference Example 1 and Comparative Examples 1 to 3, the toner increases due to the temperature rise accompanying the rotation of the portion received by the bearing 5 of the rotating shaft 41 and the stirring blade portion 42. The temperature change of the developer when the developer containing was stirred was examined as follows, and the results are shown in Table 2.

[Temperature change due to rotational friction]
As shown in FIG. 4, one end portion of the rotating shaft portion 41 of the stirring member sample 4 is rotatably supported on the bearing 5, and the other end is connected to the motor M via the coupling C and rotated at 600 rpm for one hour. The temperature of the rotating shaft 41 in the vicinity of the bearing 5 of the rotating shaft 41 was measured by thermography (NEC San-ei Instruments Ltd camera model: TH3104MR, controller model: TH31-110).

[Developer temperature change during developer agitation]
In the experimental apparatus 6 shown in FIG. 5, two stirring member samples 4 formed of the same material are set in the apparatus main body 61 as follows, and a developer (two components manufactured by Fuji Xerox Co., Ltd.) is set in the apparatus main body 61. Type), the upper opening of the apparatus main body 61 is closed with a lid 62, the developer is circulated and stirred in the arrow direction by the stirring member sample 4 for one hour, and the temperature of the developer after one hour is changed to the lid 62. Was measured using a thermocouple 65 provided so as to penetrate through and the temperature rising from the temperature before the start of stirring was examined.
The experimental device 6 includes a device main body 61 and a lid 62.
The apparatus main body 61 has a box shape having a rectangular shape in plan view of the upper opening, and a partition wall 63 is provided inside.
The partition wall 63 is provided so as to partition the inside of the apparatus main body 61 at the center in the width direction of the apparatus main body 61 except for both longitudinal sides of the apparatus main body 61.
In the apparatus main body 61, the stirring member sample 4 is rotatably set with the partition wall 63 interposed therebetween.
The two agitating member samples 4 are supported on the side wall surface of the apparatus main body 61 so that both ends of the rotating shaft portion 41 are rotatable, and one end portions are connected to each other via a gear 64.
Further, the rotating shaft portion 41 of one stirring member sample 4 is driven to rotate by a motor M.

  From Table 1 above, it can be seen that the stirring member of the present invention is suitable for stirring and transporting toner for low-temperature fixing.

  The present invention is not limited to the above embodiments. For example, in the above embodiment, the entire stirring screw is formed of the thermoplastic resin composition, but a metal collar may be provided as shown in FIG. Moreover, only the rotating shaft part or only the screw part may be formed of the thermoplastic resin composition of the present invention.

DESCRIPTION OF SYMBOLS 1 Test machine 2 Test piece 3 Opposite material 4 Stirring member sample 41 Rotating shaft part 42 Stirring blade part

Claims (4)

It has a rod-shaped rotating shaft portion, and a stirring blade portion provided so as to project outward from the periphery of the rotating shaft portion,
Used for at least stirring of a developer containing at least toner ,
The entire stirring member is formed by injection molding a thermoplastic resin composition ,
The thermoplastic resin composition has a thermal conductivity of 0.8 W / m · k or more measured by a laser flash method, and uses an A method tester of JIS K 7218, and has an inner diameter of 2.00 cm and an outer diameter of 2.56 cm. ,
A 1.5 cm high hollow cylindrical test piece is brought into contact with the end face of a mating material made of S45C carbon steel, and the mating material is slid at a peripheral speed of 20 cm / sec at room temperature. A stirring member having a physical property with a limit PV value obtained by multiplying by 100 kgf / cm · sec or more ,
The stirring member, wherein the thermoplastic resin composition contains a polycarbonate resin, an acrylonitrile-styrene copolymer resin, and graphite . The stirring member according to claim 1, wherein the thermoplastic resin composition contains a polycarbonate resin, an acrylonitrile-styrene copolymer resin, and graphite in a ratio of 65:10:10 by weight . The stirring member according to claim 2 , wherein the thermoplastic resin composition has a thermal conductivity of 1.5 W / m · k .   The stirring member according to any one of claims 1 to 3, wherein the stirring blade portion is formed in a spiral shape around the rotating shaft portion.

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