JPS61158337A - Electrostatic developer - Google Patents

Abstract

PURPOSE:To obtain the titled developer having no tendency for generating a fog in a copied image and having a good cleaning property and moisture resistance and also having a less deterioration during a lapse of time by melt- kneading and dispersing magnetic materials having a hydrophilic property and a hydrophobic property with a binder resin. CONSTITUTION:The hydrophilic material comprises an acid, an alkaline or a surface active agent having >=10 HLB. The magnetic substance composed of the hydrophilic or the hydrophobic magnetic substances comprises a metal such as cobalt and iron, an another metal alloy or a metal oxide. Said magnetic substance may be used independently or its combination contg. two kinds of metals and is used as a powder. The particle size of the magnetic substance is preferably 0.01-10mum, most preferably 0.1-4mum in a practical application. A method of coating a surface of particle with the hydrophilic or the hydrophobic substance is for example, a dipping method etc. preferably the dipping method. The usable binder resin is a styrene such as P-chlorostyrene and methylstyrene.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a static emitter for fp polishing +*V printing formed in an electrophotographic method, a static recording method, and a #grind printing method g4. [Prior Art] In general, a so-called two-component visual agent is used as a so-called two-component visual agent, which is made by mixing a carrier with a binder resin particle containing a coloring agent, etc. It can be roughly divided into so-called one-component type developer which is used without being mixed with a carrier. One-component magnetostatic one-quadrant agents are preferable in that they essentially do not have the problem of changes in the color of the toner. In addition, the magnetic toner is composed of a fine powder of a magnetic substance dispersed therein. In such a magnetic toner, since the five magnetic substances contained have a high specific soft affinity for the particles, it has high durability. For example, due to the absorption of moisture, the custom-made abrasive belt of the toner becomes masculinized over time, causing so-called fogging.
This may lead to adverse effects such as a decrease in transfer rate.For this reason, the parent (F
The ffL technique has been developed to improve the wI properties of magnetic toners by using I3 notes, etc., and such fIEi toners include: A magnetic toner obtained by blending a hydrophilic magnetic material and a lipophilic magnetic material and forming a binder resin in the same person's imagination by combining the single stranded material component's vs. the turbidity, 0 As disclosed in Japanese Patent Publication No. 58-40736, a magnetic toner containing an oil-based bar 70 alkylated @ first in a binder resin;
A magnetic white mill containing a hydrophilic magnetic material whose surface is coated with a titanium thread compensating agent and having a temperature of 0.degree. C. is known, as disclosed in Japanese Patent No. 738J. [Problems to be Solved by the Invention] However, in the above fail toner (①), since the toner particles are formed by the aqueous dispersion medium and the highly lipophilic hydrophilic It appears that the magnetic material exists with a relatively high distribution probability near the surface of the toner particles, and as a result, the toner has a surface state similar to that of a magnetic toner using only a hydrophilic magnetic material. As a result, similar to using only hydrophilic magnetic materials alone,
It is not possible to sufficiently improve properties such as @ resistance. In addition, in the above magnetic toner manufactured by ■, the surface of the toner particles is composed of a lipophilic substance, so whether a sufficient effect can be expected regarding A, which is improvement in moisture resistance, and other = It has been found that what can be done to solve the problem of VC toner, which is made up of only hydrophilic magnetic materials and which is difficult to dye the photoreceptor. The mechanism that causes this contamination of the photoreceptor is not necessarily clear.
1! Since the lipophilic substance contained in the a-type toner has a large affinity for the surface of the photoconductor, the adhesion force of the magnetic toner to the photoconductor is relatively large. Be able to think. If the photoreceptor becomes contaminated with magnetic toner, the photoreceptor's function will be inhibited. 11i111 This may cause problems such as a decrease in cross-section or rounding. [Object of the Invention] The present invention has been made against the above-mentioned background, and its objects are as follows: IJ) [No generation of capri in the armpit of the photograph, Q) Photosensitivity after development processing Good cleaning/cleaning properties on the body, 0) Poor moisture resistance and little deterioration over time, (4)
We have solved technical issues such as a good transfer rate of toner acid formed on the photoreceptor during development to the transfer material, and (5) less chance of contamination of the photoreceptor, resulting in stable and good copying at all times. The purpose is to provide a qlJ1 wish electronic system that can form a painter. [Means for Coupling the Object] The above object is to provide a static adhesive agent characterized in that it is dispersed in a hydrophilic magnetic material, a lipophilic magnetic material, and a binder resin by melt-kneading. Work hard and achieve it. Hereinafter, a case in which the present invention is applied to magnetic toner will be described in detail. In the Mi magnetic toner of the present invention, binder I: Powder of a hydrophilic magnetic material having a high affinity for water, a powder of a lipophilic magnetic material having a low affinity for water, and optionally It has a structure in which the additives added according to the conditions are dispersed, and is formed by mixing the binder resin, magnetic material, and T & eggplant agent, and going through the various steps of melt-kneading, cooling, pulverization, and classification as necessary. It is something that will be done. Here, the compositional allocation of the hydrophilic magnetic material and the lipophilic magnetic material is preferably 5:95 to 95:5, more preferably 20:80 to +150:20. Practically speaking, the most preferred range is 40:60 to 60:40. In addition, the whole toilet mouse of the magnetic material flows into the toner and f
It should be within the range of 140-7511 degrees, preferably 45-55 degrees. In the present invention, the hydrophilicity or lipophilicity of a magnetic material is defined based on the results of the following determination test. In the determination test, a powdered magnetic material with a particle size of 3 mm or less was left in an ambient atmosphere at a temperature of 20 degrees Celsius and a humidity of 50 degrees Celsius for 24 hours, and then omitted as a sample.
, a sogcv magnetic material was collected, a beaker with a capacity of 100 mt and 50 ml of distilled water at a temperature of 20°C was prepared, and the sample was poured onto the water surface from a height of 1 Q cm or less above the water surface in the beaker. This is done by quietly bringing it down. As a result of the judgment test, most of the sample did not settle and was suspended on the surface of the bottle, some remained deaf, or part or all of the sample settled but there was a small amount of it at the interface between the magnetic material and water. In the present invention, a lipophilic magnetic material in which air bubbles are present is defined as a lipophilic magnetic material, and a material in which all of the magnetic materials are adjacent to each other and the sedimented magnetic material and water do not have air bubbles at the interface and both The materials that are in contact with each other in a compatible state are referred to as hydrophilic magnetic materials in the present invention. In addition, in the determination test, if the particles of the magnetic material are aggregated at the time of sample collection, the aggregated particles are crushed as necessary to reduce the diameter of the fii material to 1 field or less. In the present invention, the hydrophilic magnetic material may preferably be a powder of Ia magnetic material normally used in magnetic toner, and the particle surface of the powder may be coated with a hydrophilic substance. You may also use the The above-mentioned hydrophilic substances include alkali, alkali, or) I
Examples include surfactants with LB of about 10 or more. When these hydrophilic substances are used, the magnetic material is 0.01 to 10 degrees, preferably 0.07 to 10 degrees.
31 [Wrinkles are desirable. The lipophilic magnetic material in the present invention is prepared by introducing a large number of hydrophobic groups into the surface of the Mi magnetic powder particles, which are usually used in Mi-based toner, by introducing a large number of hydrophobic groups into the surface of the powder particles. A material coated with a substance can be used. The above lipophilic substances include surfactants with small iLB values, bar 70 alkyl compounds, titanium camping agents, silane coupling agents, etc. The proportion of these lipophilic substances in the magnetic material is 0.01 to 10 凰Huanchi, preferably 0.05 to 5 Kei %. More preferably, the amount is 0.07 to 3N. The titanium-based camping agent used in the present invention includes:
The following compounds may be mentioned. [Exemplary compound] Commercial product name: A-1 (TPT) (Nippon Rudatsusha!liriA
-(2) Ti+0-n-C4H9) 4 Commercial product name: B-1 (TBT) (manufactured by Nippon Soda Co., Ltd.) A -(3)
T i + (J-CH2C)icH2CH2C
kiz CH3) 4 Commercial product name: TOT (
Nippon Sodasha! a) A-(4) T i+(J-
C1? ) i35) 4 Commercial product name: TST (
Nippon Soda Co., Ltd.) A-(5) (n-c4Hg(
J+2Ti+(JC2)14N+C2M4αsu2)2 Commercial product name: TAT (Nippon Sodasha guri A-(6
) U)1TiMo(JC)12
C1-1cHc3Hd). O2H5 Commercial product name: TUG (manufactured by Nippon Soda Co., Ltd.) Commercial product name: Prene Act 41B (manufactured by Ajinomoto Co., Ltd.) Commercial product name: Solé/Act 44 (Ajinomoto Co., Ltd.) Commercial product name: Prene Aku
TTS (manufactured by Ajinomoto Co., Ltd.) 8-(t)
Ol n-C4Hg -0-Ti+0-Ce17H3s) 3
Commercial product name: TBSTA (manufactured by Nippon Soda Co., Ltd.) Commercial product name: Prene Act 2S (manufactured by Ajinomoto Co., Ltd.) O Commercial product name: Niprene Act 11 (manufactured by Ajinosaku Co., Ltd.) Commercial product name: Prene Act 7 (manufactured by Ajinomoto Co., Ltd.) Commercial product name: Prene Act 201 (manufactured by Ajinomoto Co., Ltd.) (manufactured by) Commercial product name: Plain Ac)
134S (Ajinomoto Co., Ltd. Commercial product name: Plain Ac 118
(Ajinomoto Sharif) Commercial product name: Blenaku) 388 (Ajinomoto Sharif) Commercial product name: Plenact 12 (manufactured by Ajinoyusha)
A-Q2 0-n mct
H. Commercial product name: Plain Aku) 2388 (Ajinomotosha Rip) 7'f
Product name: TAA (Natabond-50) (manufactured by Nippon Soda Co., Ltd.) (manufactured by Nippon Soda Co., Ltd.) n-C4Hs-0MoTi O-Sarn-C+Hs0-
n-C4H9 m= 2++t7 or ]O Commercial product name: TnT Polymer (manufactured by Nippon-Tatsusha) B-2
(m=2)B-4(m=4)B-7(m=4)B-
10 (JTI-JO) A-(t) O O-CCxtHas n-C4Hg-0MoTi-10-11-n-C4H9
C)-n-C4Hg Commercial product name: TBSTA polymer TBSTA-400 (manufactured by Nippon Soda Co., Ltd.) As the silane thread coupling agent used in the present invention,
Can you name the following compound 'a'? [Exemplary compounds] B-Q) C)12=C)i-8i((JC)ia
)s Part name: [VTS-MJ (manufactured by Chisso Corporation)] B -
(2) C)12=CH-8i((JC2Hs)3
Product name: “VTs-BJ (manufactured by Chisso Corporation)” “KBE”
1003J (manufactured by Yuetsu Kagaku Kogyo Co., Ltd.) B-(3) C)12=cH-8i(lJc2H4
(JCH3)a Product name: "VTS-MJ (manufactured by Chisso Corporation)""KB (, 1003J (manufactured by Tomietsu Chemical Industry Co., Ltd.) B-(4) cle3. stop-", 6S Otori (
UC1--

[Manufactured by Shin-Etsu Chemical Co., Ltd.]

B-(7) H8C3H6Si (OCH3)3 Product name: "MPS-MJ (manufactured by Chisso Corporation) 1'-KBM8
03J (manufactured by Shin-Etsu Chemical Co., Ltd. 9 Product name: l'-cPS-M” (Chisso Corporation!! Ri “K
BM403" (manufactured by Shin-Etsu Chemical Co., Ltd.) Product name: "EE8-M" (manufactured by Chisso Corporation) "KBM30
3J (manufactured by Shin-Etsu Chemical Co., Ltd.) Product name: "MOPS-M" (manufactured by Chisso Corporation) [KBM5
03J (Shin-Etsu Chemical Industry Minister) B -Qj C3H6Si(OCH3)3B -(J
2 CFsCH2CHz8i (OCH3)3B (
13HzNC31(ssi(OCH3)3B-(J4)
C3H6Si(OC2H5)3B-Bright CH3(
CH4) 3 Si (OCH3)3B-Q5 C
H35i(C)C2H5)3B-Q7) C)i3
NHc2H4si((JCH3)3B-(t)
O C2H5S 5 (OCCH3) 3 B-11) (J CF3COC3H6Si(OCH3)sB-■ C2H
58i(OCzHs)aB-G! I) H8C2H45
i(OCzHs)zB -93CH2=C)icHzs
i(OC2H5)3B -@ClCsHg1:3
i(OCzHs)aB-(c) CH2=CHCH4
NH(CH2)35i(QC)13-3B-g8C
H3(GHz)s:1i((JC)L3)3B-υ)
CH3 CH2=C-C()(CH2)3Si((JCH3)3
H2J'JC-N-(CH2)3 Si (CHs
) 3B - (to) CH38i ((JC3H))
38-(4)CH3Si((JC(CHa)2)3B
-(to) CH35i((JU)izcHz(JCB
3) 3B-(g) H2NC2H4-8-CzH4Si
(QC) is) 3h H ′″″ (to)h・N(C)12)・N(C town) 2N(C
)12)・S・(QC)i・]・B −(33NCCH
2CHzSi(UCz)is)aB-(g)C)is
(CH2) 4 S i (QC)is ) 3B
-Hn-CaHnSr((JC2Hs)sg -QQ
C) is(CH2)uSi((JCH3)3B −
-Bu CHa (CHz) 1f8
i ((JC2Hs)3) As the surfactant used in the present invention, a general surfactant having a hydrophilic group and a hydrophobic group in the molecule, particularly one having low Hl and B, can be used. The surfactants can be classified into anionic surfactants, cationic surfactants, amphoteric surfactants, and nonionic surfactants. Examples of these surfactants include the following compounds. [Exemplary compounds] C' (1) OCH3CHasoC)i
z→10 C-N-CHz CO(JMC-(2)
U CH3II + CHz (CHz→)C tri=C)←5CH2 rough C-N
-C) 12(X)OMC-mouth) OH I 1 CHsfCHz+xo C-N-C) 12COOMCH
3soC)12-)us(J2-N-C)12COQMC
-(6) CH3I CH3+GHz+uSOz-N-CHzCOUMC-(
7) Hl CH3fCH2flCki=CJ-1+cHz+vsU
2-N-CHzCooMC-(S)
OCH3+CH4+7C)i=C
)i+CHz+sOP-OM(,IM C-(9) O CH3+CH2+u(JP-t)M Width C-(1:l C)i3+CH2+llfJsc)
3MC-(141C83+1.,:H2→13S(J
3MC-(g) C1(3+C)i29, ((JCHz
CHZ, (JSt) 3Mc - (r4
uCHj (C top-1
2) Five 7 (J-Cki2 CHCH4-(J-C+CH
2-n, 6c)i 3CH C-(6) O CM3+CH2+HC-(J ChzCHe)12-(
J) 1h C-α9 U CH4+CH2 □6C-U-C)12C)icH2-
(J) 1CH C-(1) Glycerin hardening and mustard oil fatty acid ester C
-■ 0 CHJ+CH2-)1oC-NH+C112CH2Q-
)2)1■ CH2 C-(c) U Cf)i j5C-N)i(,:)12(,')12
Nso021-i5u2C-) C171 (35S
to O2 HCH2CH2NH2 (M in the above formula represents sodium, lithium, calcium, ammonia, or a fatty amine having a long carbon chain) I can do it. C-4iE9 C4FsC00H C-G! 7) C7F1sSO3NaC-(g)
Cs F 170 CH3C-(t) CF35O3
C2H5 C-■ C7F15CONH2 C-@ C4F9803N)14
CC-(to) C4F g NC0 C-@CtoFzxSNa CH30)i ) C1(3 CH3 L( CHa OH -〇)12(CF2CF'2)3)1 ) C1C1
-12Ck-12(J)i h3 CH3 (J)f CH3 -c)i2 C1-1田2UCH2(CFzeFz)z
Written by H U)l 薯-CH2CHChi2UCH2(Ck"zCk'2)
3) i-0-i2 CHCHzLX old 2 (CF2Ck
'z)zHl H C)i, U)1 0HCH3 CH3C))i C-(E) l-13 cm(4 (JsFx 7U(CH2csmall(CH3)3) I-
Q9 C-η CH3 Ct;Q Cek'xtO(C2H4U)nCH3(
However, n is 1 to 20) alkyl group or substituted alkyl group) C-(support) C-β C9Ft7(J(CzH4(J)ncH2cH2N(C
H3)3 I (however, n is 1 to 20) (However, R is an alkyl group having 1 to 6 carbon atoms or a direct
/ Yaru base (however, n is 1 to 20) The hydrophilic magnetic material or parent bolted magnetic material 1 of the present invention is horizontally 1
(Material bodies include 11 types of ferrite such as cobalt, iron, nickel, aluminum such as magnetite, cobal), m, &, lead, nickel, magnesium,
Can metal oxides such as tin, zinc, gold, silver, copper, zirconitum, other metals such as gold, aluminum oxide, iron oxide, and nickel acid be used? These magnetic materials can be used singly or in combination of two or more rods. The magnetic material is used in the form of a magnet, and its diameter is preferably 0.01 to 301 Am, more preferably 0.05 to 5 μm, and more preferably 0.1 to 4 μm for practical purposes. As a method for coating the surface of magnetic particles with the above-mentioned hydrophilic or oleaginous substances, coating methods such as dipping, fluid swimming, and roll milling can be used. preferable. Examples of fats in the binder 1 that can be used in the present invention include styrenes such as p-chlorostyrene and methylstyrene; vinyl halides such as vinyl chloride, vinyl bromide, and vinyl heptanide; Vinyl esters such as vinyl propionate, vinyl penzoate, vinyl rI6 acid, methyl acrylate, ethyl acrylate, rRn-butyl acrylate, isobutyl acrylate, dodecyl acryl, n-octyl acryl, 3-octyl acrylate
α-Methylene B￥1 monocarbon esters such as chloroethyl, acrylic phenyl, α-chloroacrylic atom methyl, methacrylic methyl, methacrylic ether, methacryl@n-butyl, methacrylic 1so-butyl; acrylonitrile , methacrylonitrile, acrylamide, vinyl methyl ether, vinyl isobutyl ether, vinyl ethyl ether. Polymerized monopolymer or other side B
Epoxy tree 8 effect, rosin note 7 enol hono V as k
Marine resin, 1 Le Rose Mausoleum, polyether resin, polyvinyl butyral resin, polyester resin, styrene
61 materials such as butadiene resin, polyurethane side B material, polyvinyl formal side surface material, melamine material B material, polycarbonate resin material, and fluorine material such as Teflon may be used alone or in a blend. In addition, the binder resin can be obtained by adding a divinyl compound such as divinylbenzene or a crosslinkable MA body such as a diallyl compound to the above ratio as a rat body yield. It may be a homopolymer. Examples of the desilting agent that may be used as necessary in the present invention include a coloring agent, a coloring agent, an offsetting agent, an m-line, and others. As the color ThJ, for example, carbon black, nigrosine dye (C, 1, 5
0415B), Aniline Blue (C, t, Pigeon 50405)
), Calco Oil Blue (e, I・Nn1zOeCBl
ue 3), chrome yellow (C, l-m140
90), Ultramariy 7” Roux (C, 1, m7
7103), DuPont Oil Red (0,1-m261
05), Orient Manil Reddna 330 (C/Engineering/N
Q60505), Quinoline Yellow (C, I, floor 470
05), methylenez. Luke chloride (C, I-floor 52015), phthalocyanine blue (C, 1, m74] 60), malachite green off-bray) (C, 1-Yang 42,000), lamp black (C, engineering, -77266), rose penga/ I
/(L: , I/N45435), oil black,
Azo oil and other substances can be used alone or in combination. Also, conventionally known anti-inflammatory agents, anti-offset agents, lubricants, etc. can be used. . The magnetic toner of the present invention is manufactured by a bath melt kneading method (Vc), and specifically, toner components such as a binder resin and a magnetic material coloring agent are prepared in advance. After mixing, heat the binder resin until it becomes molten. Each toner component is kneaded until it becomes uniform. A two-roll, three-roll, extruder, panburi mixer, etc. can be preferably used for kneading, and the kneading temperature is usually 100-180°C, preferably 120-170°C.
It is. The magnetic toner of the present invention, as schematically shown in FIG.
In the toner particles T, a parent magnetic material (A), a monotonically lipophilic material (A), and a lipophilic monotonal material (S) are dispersed in a q-state. FIG. 2 shows an example of a specific device that can be used to step through the process of producing the III injection toner of the present invention. 11th@HCN, 1 is V'', 7th thread photoconductor is a drum-shaped o-amita body consisting of 44 note photoconductors, LgIkt in the direction of the arrow,,Fig. Silence wLIM on the surface due to the undisclosed Obito Russia party device! , is formed. 2 is a sleeve made of a non-magnetic material such as aluminum; 3 is a compound N provided inside the sleeve 2;
The sleeve 2 and the magnet 3 constitute a developer transport carrier. These sleeve 2 and magnet body 3 are relatively rotatable, and in the illustrated example, sleeve 2 is rotated in the direction of the arrow, and magnet body 3 is rotated (9) in the direction of connection with the sleeve. Magnet body 3ONS
The 4ii pole usually has a magnetic flux of SOO~1500 Gauss'f! 1
It is magnetized at the same time, and the sleeve 20 is
A magnetic brush is formed by the brush-like spikes that stand up in the suction area. 4 is the height of the magnetic brush; 5 is a regulating blade made of magnetic or non-magnetic material that regulates rats;
is a cleaning blade that removes the magnetic brush that has passed through the amount of seedlings A from above the sleeve 2. The surface of the sleeve 20 is -4321 in the hopper 6! l! Since the monks will do the preparations, the supply of the real preparations will be carried out accordingly. In the above-mentioned construction, the gap between the sleeve 2 and the Shizuka-Isaho support 1 is set to be several tens to 2000 pm, and the Shizuka-Isaho on the Shizuka-Isa support 1 is Now that I'm on the edge of my seat,
The magnetic brush formed on the surface of the sleeve 20 generates a magnetic flux '6! of the surface along with the LgIU of the sleeve 2. As the thorns change, they no longer vibrate and move on the sleeve 2, thereby stably and smoothly passing through the gap between the thorns and the thorns. The objective is to provide a uniform developing effect to the surface of the body 10, resulting in a stable and high level of 1I.
iIJ image djk degree current t] 1i! enable. [Effects of the Invention] In the magnetic toner of the present invention, since the magnetic material consisting of a hydrophilic magnetic material and a lipophilic magnetic material is mechanically separated into a binder resin by a bath melt kneading method, the magnetic toner has a hydrophilic magnetic material. Both the hydrophilic magnetic material and the lipophilic magnetic material are uniformly dispersed throughout the toner particles without being unevenly distributed, and therefore, on the surface of the toner particles, the hydrophilic magnetic material Hb lipophilic magnetic material scale or the oleophilic magnetic material is uniformly dispersed in °C depending on the fdi addition ratio. It will be distributed. As described above, since the Mi magnetic toner of the present invention has both the hydrophilic material and the lipophilic magnetic material distributed on its surface in an appropriate ratio, there are no drawbacks due to the presence of each magnetic material in excess. This will allow only the advantages of both ministries to emerge without becoming overwhelming. As a result, the magnetic toner of the present invention has a water-resistant IC, and has a small change over time due to the magnetic flux characteristics, etc., and is less likely to cause contamination of the photoreceptor. It is possible to form a clear IIMli image. In addition, by specifying the composition ratio of hydrophilic magnetic material and lipophilic magnetic material in the magnetic material, it becomes possible to easily control the Efi Toat 1 custom-made according to the current method or current 1 conditions. . Above, we have described the case where it is applied to the magnetic toner constituting the static magnetic toner of the present invention, but the static magnetic toner of the present invention is not limited to this. Second income Itogen Rin 4
It can also be used as a toner or carrier that constitutes ``, and in this case (as in the case of the above-mentioned magnetic toner, #p abrasive that can achieve good f!A@ over a long period of time, although durability is questionable) It is possible to provide a bleaching area agent. [Explanatory Practical Examples] Examples of the present invention will be described below, but the present invention is not limited to these. Actual IM example] Styrene-acrylic HA 40 parts "S-LEC R-3" (Sekisui Chemical Co., Ltd.) Styrene-butadiene resin 5 parts (monomer composition ratio of styrene and butadiene 95:5) Carbon blank
2 parts "Carbon blanker 30" (manufactured by Mitsubishi Kasei Co., Ltd.) Polypropylene 5 parts "Viscol 660PJ (manufactured by Sanyo Kasei Co., Ltd.) Loading agent
Part 1 “Nigrosine Base EXJ (
Manufactured by Orient Chemical Co., Ltd. Hydrophilic magnetizable material
10 parts 1'-BL-100J (Titan Kogyo Co., Ltd. Lipophilic magnetic material 40
"BL-120: Magnetic material BL-100 coated with a titanium-based coupling agent (exemplified compound A-Q3) of 1.0 ml to this magnetic material #+" (Titan Kogyo Co., Ltd.) Co., Ltd.) A mixture of the above substances was milled in a roll mill at a temperature of 150C.
The mixture is kneaded, then coarsely ground using a hammer mill, finely ground using a turbo mill, and then heat treated using a spray dryer.
It was classified by an air classifier to obtain toner powder with a particle size of approximately 55-30p. This toner powder has 0.2 liters of it.
Hydrophobic silica fine powder "R-972J (manufactured by Nippon Aerosil Co., Ltd.) corresponding to 1% was combined with additive a? to obtain fii injection toner!-0, which was referred to as "toner". Example 2 Styrene-acrylic resin 40 parts "Esletsuk R-3" Ethylene-zenyl acetate oil 5 parts "Waltrasen UE-630J (manufactured by Toyo Soda Co., Ltd.) Car pump 2
2 parts MA-100J (manufactured by Mitsubishi Kasei) Polypropylene 5 parts Viscole 660i'J Loading agent 1 part Oil Black B8J (manufactured by Orient Chemical Co., Ltd.) Hydrophilic magnetic material 48 parts BL-8f'J (
(Manufactured by Titan Kogyo Co., Ltd.) Lipophilic magnetic material
Part 12 "5P-20: Magnetic material BL, -8" was coated with a titanium-based coupling agent (exemplified compound A-1!3.1) of 0.8 t% with respect to the magnetic material. A magnetic toner ft was obtained in the same manner as in Example 1 except that the above substances were used. This will be referred to as "toner 2". Example 3 As a magnetic material. Hydrophilic magnetic material 27.5 parts 11
(n-gJ (manufactured by Titan Kogyo Co., Ltd.) Lipophilic 1aa material M 27.5m
(For the magnetic material RB-BL1, 0.0% for this magnetic material.
32Kt bar 70 alkyl compound (exemplary compound C
-■) [Florado Fie-134J (manufactured by 3M)) MJs, treated)? A JIa toner was obtained in the same manner as in Example 1 except for using the following. This will be referred to as "toner 3." Comparative example] As a magnetic material, 50 hydrophilic magnetic materials “BI,
A magnetic toner was obtained in the same manner as in Example 1 except that −100 J was used. This is referred to as "comparison toner l". Comparative Example 2 Lipophilic magnetic material sub-O static (Mi
The magnetic material abbreviated as RB-BL is 0.5 I for this magnetic material.
A magnetic toner was obtained in the same manner as in Example 1, except that 4J (manufactured by 3M Company) was used. This is referred to as "comparison toner 2." Examples 4 to 6 As a magnetic material, exemplified compound A-(44) was used instead of the bar 70 alkyl compound in Example 3. A magnetic toner was obtained in the same manner as in Example 3, except that each of B-■ and C-Ql) was used. Each of these is
Toner 4J, “)ner 5” and “toner 6”
shall be. (Actual photocopying test) The electrophotographic copying machine 1'-U-B x
10J (Koshiroku Photo Industry Co., Ltd. IM) at a temperature of 20°C.
We conducted a trance test in an atmosphere with a relative humidity of 50 degrees, and examined the following items. 0) The bright period of the commercial 1 Ishoku anti-live-action test and the 2.500 consecutive repetitions of Yomata (
A copy of Till Isa's picture 1 in Boku M) is reflected in the dark I
lf:,? Measured by i. (If the toner is small, the deterioration of the toner over time is small. Q) If the toner attachment part is in the non-m section of Kavli Enoki Shagatsu! j
Judgment is made by measuring the undulation using a reflection densitometer. Measurements were performed at the beginning of the copying test and at the 2,500th consecutive copying (second half). (3) Observe the total fringe copy uIi+ visually and determine the fringe occurrence state a. (4) Cleaning property The determination is made by visually observing the photoreceptor surface thI after the cleaning process. (5) Photoconductor contamination The degree of contamination caused by toner on the surface of the photoconductor is determined by measuring it with a reflection densitometer. (6) Toner scattering Visually observe and determine the state of occurrence of contamination due to toner scattering at certain locations within the electrophotographic copying machine (charging electrode wire, charging electrode puncture plate, etc.) (7) Moisture resistance actual copying Test atmosphere: temperature 20℃, relative humidity 50%<+
ambient atmosphere 1), temperature 33°C, relative humidity 80°C (atmosphere 1)
1), and under each atmosphere (・y
,:* Determined by measuring the plate concentration of the photographic image using a reflection densitometer. The above results are shown in Table 1. In addition, the above items (3) to (
Regarding 6), the rating is evaluated from a relative perspective with 0 being good enough to cause no practical problems and X being so good that it is causing practical problems. As is clear from the above results, the magnetic toner of the present invention gave excellent results in each item in the actual photographic test. On the other hand, in the comparative example, excellent results were not obtained for almost all of the items. In Comparative Example I, since the magnetic family consists only of hydrophilic ones, the water resistance is particularly insufficient and the toner deteriorates significantly over time. In Comparative Example 2, since the magnetic material is lipophilic, contamination of the photoreceptor is obvious, and the 8! I couldn't connect with the loneliness.

[Brief explanation of drawings]

Figure 1 is an explanatory cross-sectional view schematically showing the seismic imitation retardant of the present invention, and Fig. 2 can be used to carry out the current retouching process by electrostatic mass electrostatic control of the present invention. This is an explanatory W'F plane section schematically showing an example of A11ft. T... Toner particles a... Hydrophilic magnetic material b.
...Lipophilic magnetic material 1...Static support 2...Sleeve 3...Magnet 4...Regulation blade
5...Cleaning blade 6...Hopper

Claims (1)

[Claims] 1) An electrostatic image developer comprising a hydrophilic magnetic material and a lipophilic magnetic material dispersed in a binder resin by melt-kneading.