CN104111597B - Resin-coated carrier and two-component developing agent - Google Patents
Resin-coated carrier and two-component developing agent Download PDFInfo
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- CN104111597B CN104111597B CN201410289179.7A CN201410289179A CN104111597B CN 104111597 B CN104111597 B CN 104111597B CN 201410289179 A CN201410289179 A CN 201410289179A CN 104111597 B CN104111597 B CN 104111597B
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Abstract
The present invention relates to resin-coated carrier and two-component developing agent, solve that existing resin-coated carrier comes off in clad when used for a long time from magnetic core material and carrier assigns the problem of charged toner amount changes, image quality is brought to deteriorate during environmental change.The present invention includes the clad of magnetic core material and coated magnetic core material, the clad contains binder resin and conducting particles, its described binder resin is the copolymer at least containing 2 two kinds of monomeric units of carboxylic ethyl ester of methyl methacrylate and acrylic acid, and the dosage for synthesizing methyl methacrylate in the raw material monomer of the copolymer accounts for 1.0~95.0wt%, and the dosage of 2 carboxylic ethyl ester of acrylic acid accounts for 0.1~10.0wt%.Resin-coated carrier of the present invention is not easy to come off from magnetic core material in clad when used for a long time, the carried charge of toner stabilization can be assigned environmental change, developer of the present invention is good for durability in image forming apparatus, can inhibit the deterioration of image quality.
Description
Technical field
It coats the present invention relates to the resin-coated carrier that can be used in electrostatic image development field and containing the resin and carries
The two-component developing agent of body.
Background technology
In electrostatic image development field, the two-component developing agent system being made of carrier and toner is because of tune easy to implement
Toner carried charge is stablized, and obtains high resolution image, thus is obtained in fields such as high-speed printer, duplicator, all-in-one multifunctional machines
Extensive use.Magnetic carrier of the carrier of two-component developing agent including no coated with resin clad and there is coated with resin clad
Resin-coated carrier, for the magnetic carrier compared with no coated with resin clad, by magnetic core material and its surface coated with resin cladding
There is the resin-coated carrier that layer is formed adjustable, easy acquisition high definition image quality to be increasingly becoming mainstream.
Resin-coated carrier clad prevents carrier surface from polluting, and carried charge is inhibited to change, and adjusts developer resistance, with
And reduce the effect of carried charge distribution.Resin clad comes off from magnetic core surfaces when used for a long time, and carrier resistance is caused to drop
It is low, while the resin chips to come off can interfere the normal friction of toner and carrier to charge, and carrier is caused to assign charged toner
Amount variation brings the degradation phenomena of image quality.For it is steady that resin clad is inhibited to come off from magnetic core surfaces, assigns toner
The example of the resin-coated carrier of fixed carried charge can enumerate Patent Documents 1 to 3.
In patent document 1 (application number 201010510269.6), it is with specific structure to disclose a kind of clad resin
Copolymer hydrolyze with generate silanol and be condensed using organic titanic compound and the cross-linked material that obtains.
In patent document 2 (application number 201010248477.3), it is containing with hydroxyl to disclose a kind of clad resin
The polymer of the acrylic resin of side chain, polyalcohol and isocyanates.
In patent document 3 (application number 200980107547.9), disclosing a kind of clad resin and including at least has spy
Determine the acrylic monomer of structure and copolymerization of the acrylic compounds macromonomer as copolymerization component with specific structure
Object.
Although clad resin disclosed in above patent document 1~2 forms cross-linked structure in itself, clad resin with
Chemical bond is not formed between magnetic core material, clad resin can come off from magnetic core surfaces when used for a long time, lead to carrier
Resistance reduces, and the resin chips and exposed magnetic core material to come off can bring carrier to assign the variation of charged toner amount, bring figure
As the deterioration of image quality.Clad resin disclosed in above patent document 3 is thermoplastic resin, cladding initial resin and magnetic core material
There is certain cohesive force on surface, but final cohesive force is poor, is especially used for a long time, clad resin is easily from magnetic core surfaces
It comes off.
Invention content
The purpose of the present invention is to solve above-mentioned technical problems, provide a kind of resin-coated carrier.
The present invention also provides a kind of two-component developing agents containing above-mentioned resin-coated carrier.
Resin-coated carrier of the present invention, the clad including magnetic core material and coated magnetic core material, the clad is containing viscous
Resin and conducting particles, the binder resin are at least to contain methyl methacrylate and acrylic acid -2- carboxylics two kinds of lists of ethyl ester
The copolymer of body unit, and the dosage for synthesizing methyl methacrylate in the raw material monomer of the copolymer account for 1.0~
95.0wt%, the dosage of acrylic acid -2- carboxylic ethyl esters account for 0.1~10.0wt%.
Further, in the clad, relative to the binder resin of 100 mass parts, contain 3~30 mass parts
Conducting particles.
The present inventor is had found by research experiment：The present invention adds acrylic acid -2- in the raw material monomer of synthetic copolymer
Carboxylic ethyl ester, the carboxylic acid in copolymer on acrylic acid -2- carboxylic acetate monomer units can be chelated with iron in magnetic core material ferrite, be increased
Cohesive force between binder resin and magnetic core material, inhibits clad to come off from magnetic core material；In the monomer of synthetic copolymer
Methyl methacrylate is added in raw material, using the In frared spectra of methyl, carrier can be enhanced, the negative electrical charge of toner is assigned
Give ability, raw material monomer acrylic acid -2- carboxylics ethyl ester and methyl methacrylate are poor there are polarity in addition, the two be easily copolymerized and
There is two kinds of monomeric units in copolymer is alternately inclined to, and carrier can be inhibited to assign charged toner amount in environmental change and become
Change.
In the present invention, the dosage of methyl methacrylate in the raw material monomer (total 100wt%) of the copolymer is synthesized
Preferably 1.0~95.0wt%, more preferably 10.0~60.0wt%.The dosage of methyl methacrylate is less than 1.0wt%, carries
It is low that body assigns charged toner amount；The dosage of methyl methacrylate is more than 95.0wt%, and the enhancing of binder resin hydrophily carries
Body assigns charged toner amount and reduces.In the present invention, the use of acrylic acid -2- carboxylic ethyl esters in the raw material monomer of the copolymer is synthesized
Amount is preferably 0.1~10.0wt%, more preferably 0.3~5.0wt%.The dosage of acrylic acid -2- carboxylic ethyl esters is less than 0.1wt%,
Cohesive force between binder resin and magnetic core material is insufficient, and clad is used for a long time and easily comes off from magnetic core material；Acrylic acid -2-
The dosage of carboxylic ethyl ester is more than 10.0wt%, the enhancing of binder resin hydrophily, and carrier assigns charged toner amount and reduces.
Binder resin of the present invention is poly- (methyl methacrylate-(acrylic acid -2- carboxylics ethyl ester)) copolymer, poly- (methyl-prop
E pioic acid methyl ester-styrene-(acrylic acid -2- carboxylics ethyl ester)) copolymer or it is poly- (methyl methacrylate-cyclohexyl methacrylate -
(acrylic acid -2- carboxylics ethyl ester)) one kind in copolymer.Wherein preferably it is poly- (methyl methacrylate-cyclohexyl methacrylate-
(acrylic acid -2- carboxylics ethyl ester)) copolymer.
In the present invention, the copolymer that binder resin uses can use well-known method to manufacture, and can enumerate lotion
Polymerization, suspension polymerization, solution polymerization process, dispersion copolymerization method etc..
In the present invention, binder resin weight average molecular weight preferably 50,000~300,000, more preferable 80,000~250,000.Weight average molecular weight is small
In 50,000, carrier imparting charged toner amount is used for a long time and easily changes；Weight average molecular weight is more than 300,000, binder resin and magnetic
Property core material between initial adhesive force be deteriorated, be used for a long time clad easily come off from magnetic core material.
Conducting particles of the present invention can be one kind in carbon black, tin oxide, titanium oxide, zinc oxide, aluminium oxide.Wherein preferably
Carbon black.
In the present invention, preferably 0.01~0.35 μm, more preferable 0.03~0.30 μm of conductive particle size.Conductive particle size
It less than 0.01 μm, is easily aggregated between conducting particles, conducting particles is unevenly distributed in clad, and carrier assigns charged toner amount
Distribution broadens；Conductive particle size is more than 0.35 μm, and conducting particles easily comes off from clad, and toner easily absorption is coated in carrier
Layer surface, image density reduce.
In the present invention, conducting particles dosage is preferably the 3~30% of the binder resin quality, more preferably described bonding
The 5~20% of resin quality.Conducting particles content is less than 3%, and toner easily absorption is in carrier cover surface, image density drop
It is low；Conducting particles content is higher than 30%, and carrier attachment easily occurs for carrier electrification.
In the present invention, can also have in the zone of reasonableness for not influencing present inventive concept, in clad needs to add it in fact
Its additive, such as carried charge controlling agent, common carried charge controlling agent can enumerate organic siliconresin, fluororesin, phenolic aldehyde tree
Fat, unsaturated polyester (UP), epoxy resin, Lauxite, melmac, polyurethane.
Method of the present invention for manufacturing resin-coated carrier is not particularly limited, and can be well known any method,
Wet method cladding can enumerate the infusion process that carrier core material is made to be soaked in clad dispersion liquid；Clad dispersion liquid is sprayed to load
Spray-on process on body core material；Using air flow to the fluidized bed process of the carrier core material spray coated layer dispersion liquid of suspended state；
Dry method cladding, which can be enumerated, will coat layer component addition carrier core material using dry bag method of impact force cladding etc..
Specific example can be enumerated：Clad dispersion is obtained as first added in binder resin, conducting particles in toluene
Carrier core material is then immersed in clad dispersion liquid by liquid, then evaporates solvent, sieve classification is to get resin-coated carrier；
Or binder resin, conducting particles are added directly into mixing in carrier core material, resin combination is made to exist followed by impact force
Carrier core material surface bonding extends, and then sieve classification, obtains resin-coated carrier.
Preferably 0.05~3 μm, more preferable 0.1~2 μm of the coating thickness that the present invention is formed.Coating thickness is less than 0.05
μm, toner, additive can be attached to exposed magnetic core surfaces；Coating thickness is more than 3 μm, and toner easily absorption is carrying
Body cover surface, image density reduce.To reach certain cladding thickness and clad ratio, the quality dosage of binder resin is preferred
It is 1~5 mass parts relative to magnetic 100 mass parts of core material.
The magnetic core material particle that the present invention uses can use well-known magnetic particle, can enumerate Mn systems iron oxygen
Body, Mn-Mg based ferrites, Mn-Mg-Sr based ferrites.Magnetism core material can obtain high saturation and magnetic intensity when containing Mn, when containing
Magnetic core material proportion can be reduced by having during Mg, can improve magnetic core material saturation magnetization when containing Sr.
In the present invention, magnetic core material particle volume intermediate value (D50) preferably 15~80 μm, more preferable 20~60 μm.Magnetic core
Material particle diameter is less than 15 μm, is easily aggregated between magnetic core material particle；Magnetic core material particle diameter is more than 80 μm, it is difficult to obtain steady
Fixed high resolution image.
In the present invention, magnetic core material particle saturation magnetization preferably 30~100emu/g, more preferable 50~80emu/g.
Saturation magnetization is less than 30emu/g, and carrier may be developed in photosensitive drums together with toner；Saturation magnetization is higher than
100emu/g, carrier are not easily shifted on developer roll.
In the present invention, magnetic core material particle volume resistivity preferably 1 × 103~1 × 1011Ω cm, more preferable 1 × 105
~1 × 109Ω·cm.Magnetic core material particle volume resistivity is less than 1 × 103Ω cm, charged toner amount may be decreased, easily
Carrier attachment occurs；Magnetic core material particle volume resistivity is higher than 1 × 1011Ω cm easily occur toner and are attached on carrier,
Image density reduces.
The two-component developing agent of the present invention includes toner and above-mentioned resin-coated carrier.
The manufacturing method of the toner is not particularly limited, can be with as long as meeting the requirement of electrostatic image forming apparatus
Use such as manufactures such as comminuting method, suspended polymerization, emulsification agglutination, the suspended method of dissolving and polyester extension method of existing various methods
Method.
Advantageous effect：
Resin-coated carrier of the present invention contains acrylic acid -2- carboxylics ethyl ester and first by being used in clad binder resin
The copolymer of two kinds of monomeric units of base methyl acrylate improves the cohesive force between clad resin and magnetic core material, in environment
Carrier can be inhibited to assign charged toner amount during variation to change.Resin-coated carrier of the present invention is coating when used for a long time
Layer is not easy to come off from magnetic core material, and the carried charge of toner stabilization can be assigned environmental change, and developer of the present invention is used
Durability is good in image forming apparatus, can inhibit the deterioration of image quality.
Specific embodiment
Hereinafter in addition to being otherwise noted, " part " of record, " % " represent " mass parts ", " quality % " respectively.
The manufacture of magnetic core material
By 72.5mol%Fe2O3, 8.3mol%Mn3O4, 19.2mol%MgO be converted into required di-iron trioxide, four oxidation
The quality of three manganese, magnesia, then weighs and mixes, and the amount of the substance of product constituent is made to reach aforementioned proportion value.Then
The aqueous solution of appropriate polycarboxylic acids ammonium dispersant and the aqueous solution of polyvinyl alcohol binder are added in into above-mentioned carrier core material raw material, is stirred
Mixing obtains 50% slurries, and the slurries are ground 2h in commercially available circulating agitating ball mill, obtain volume-median diameter (D50)
For 1.0 μm of mixed slurry.The mixed slurry is subjected to granulation processing with commercially available spray dryer, obtain grain size for 10~
100 μm of preformed granular then from room temperature, by 120 DEG C/h, rises to 920 DEG C, keeps the temperature 2h, furnace cooling is down to room temperature and is gone out
Stove is made and is pre-sintered object.Object will be pre-sintered and carry out break process with commercially available mechanical crusher, obtain target grain size basic one
The pre-sintering composition granule of cause.
Then 0.11 part of CaO and 0.01 part of SiO is added into the pre-sintering composition granule that 100 parts of break process are crossed on one side2, stir
It mixes to obtain the mixture for being pre-sintered object；0.25 part of polycarboxylic acids ammonium dispersant and 5.0 part 10.0% of poly- second are added into water on one side
Enol binder, then the mixture of the above-mentioned pre-sintering object is put into thereto, 50% slurries are stirred to get, then commercially available
3h is ground in circulating agitating ball mill, obtains volume-median diameter (D50) it is 1.0 μm of particle slurries, then with commercially available spraying
Drying machine carries out granulation processing, obtains the granulation composition granule that grain size is 10~100 μm, then from room temperature, by 50 DEG C/h, rises to
450 DEG C, 2h is kept the temperature, then by 120 DEG C/h, 800 DEG C is risen to, keeps the temperature 2h, then by 50 DEG C/h, 1240 DEG C is risen to, keeps the temperature 2h, with
Furnace cooling but, is down to room temperature and comes out of the stove.Then double sintering object is subjected to break process with mechanical crusher, is sieved with the SUS of 325 mesh
Mesh screen point removes out coarse granule, and fine grained is removed out by air classification, is then divided from carrier core material particle using electromagnetic separator
The weaker particle of magnetic force is selected, obtains volume-median diameter (D50) it is 38 μm, saturation magnetization is the carrier core material grain of 60emu/g
Son, volume resistivity are 1 × 109The magnetic core material particle of Ω cm.
The manufacture of resin-coated carrier 1
By 3.50 parts of P (MMA-CHMA- (β-CEA)) (poly- (methyl methacrylate-cyclohexyl methacrylate-(propylene
Acid -2- carboxylics ethyl ester)) copolymer, Mw：25×104), 0.53 part of carbon black put into 100 parts of magnetic core material (volume-median diameter D50：38
μm, saturation magnetization：60emu/g, volume resistivity：1×109Ω cm) in, it stirs and evenly mixs, is coated using dry method, made
Grain machine (model：NMG-10L, manufacturer：Japanese NARA) on coat, after cladding with the SUS sieves of 325 mesh sieve, air classification.
Obtained carrier is known as resin-coated carrier 1.
The manufacture of resin-coated carrier 2~6
In the manufacture of resin-coated carrier 1, in addition to binder resin type, copolymerization component are copolymerized mass ratio, molecular weight
And other than binder resin dosage, conducting particles carbon black loading are changed to shown in table 1, other conditions are identical to obtain resin-coated carrier
2~6.
The manufacture of resin-coated carrier 7
By 2.00 parts of P (MMA-CHMA- (β-CEA)) (poly- (methyl methacrylate-cyclohexyl methacrylate-(propylene
Acid -2- carboxylics ethyl ester)) copolymer, Mw：8×104) be dissolved in 40 parts of toluene, it then adds 0.20 part of carbon black stirring and cladding is made
Layer dispersion liquid then adds in 100 parts of magnetic core material (volume-median diameter D into the clad dispersion liquid50：38 μm, saturated magnetization is strong
Degree：60emu/g, volume resistivity：1×109Ω cm), using infusion process, in kneader (model：HKD2.5, manufacturer：Moral
State IKA) on coat, solvent is removed after cladding, then with the SUS sieves of 325 mesh sieve, air classification.Obtained carrier is known as
Resin-coated carrier 7.
The manufacture of resin-coated carrier 8~13
In the manufacture of resin-coated carrier 7, in addition to binder resin type, copolymerization component are copolymerized mass ratio, molecular weight
And other than binder resin dosage, conducting particles carbon black loading are changed to shown in table 1, other conditions are identical to obtain resin-coated carrier
8~13.
The manufacture of resin-coated carrier 14
In the manufacture of resin-coated carrier 1, other than being not added with methyl methacrylate copolymer and being combined point, other conditions
It is identical to obtain resin-coated carrier 14.
The manufacture of resin-coated carrier 15
In the manufacture of resin-coated carrier 1, other than being not added with acrylic acid -2- carboxylic ethyl ester copolymerization components, other
Part is identical to obtain resin-coated carrier 15.
The manufacture of resin-coated carrier 16
In the manufacture of resin-coated carrier 1, in addition to binder resin molecular weight is changed to 40 × 104In addition, other
Part is identical to obtain resin-coated carrier 16.
Table 1
In table：
(1)：P (MMA-CHMA- (β-CEA)), poly- (methyl methacrylate-cyclohexyl methacrylate-(acrylic acid -2-
Carboxylic ethyl ester)) copolymer
(2)：P (MMA-St- (β-CEA)), poly- (Methyl Methacrylate-Styrene-(acrylic acid -2- carboxylics ethyl ester)) copolymerization
Object
(3)：P (MMA- (β-CEA)), poly- (methyl methacrylate-(acrylic acid -2- carboxylics ethyl ester)) copolymer
(4)：P (CHMA- (β-CEA)), poly- (cyclohexyl methacrylate-(acrylic acid -2- carboxylics ethyl ester)) copolymer
(5)：P (MMA-CHMA), poly- (methyl methacrylate-cyclohexyl methacrylate) copolymer
As it can be seen from table 1 carried charge variation and volume resistivity variation of the carrier of the present invention before and after durability test
Slightly, there is no problem in practical.As it can be seen from table 1 copolymer used in 14 clad of carrier is free of methyl methacrylate
Monomeric unit, copolymer used in 15 clad of carrier are free of acrylic acid -2- carboxylic acetate monomer units, are total to used in 16 clad of carrier
Polymers weight average molecular weight is 40 × 104(it is more than 30 × 104), test result shows carrier 14~16 before and after durability test
Carried charge changes and volume resistivity changes in the two at least 1 in practical there are problem, and overall merit is unqualified.
Embodiment 1~13
Above-mentioned " resin-coated carrier 1~13 " and " toner " are mixed as follows, manufacture embodiment bi-component is " aobvious
Shadow agent 1~13 ".92 parts of carriers is made to mix 10min in mixing machine with 8 parts of toners, prepare two-component developing agent；Simultaneously by 95
Part " toner " " resin-coated carrier 1~13 " above-mentioned with 5 parts mixes, and prepares replenishment developer.
Comparative example 1~3
Above-mentioned " resin-coated carrier 14~16 " and " toner " are mixed as follows, manufacture comparative example bi-component
" developer 14~16 ".92 parts of carriers is made to mix 10min in mixing machine with 8 parts of toners, prepare two-component developing agent；Simultaneously
95 parts " toners " " resin-coated carrier 14~16 " above-mentioned with 5 parts is mixed, prepares replenishment developer.
Developer is evaluated
Use commercially available color copy machine (print speed：Colored 65ppm, black and white 65ppm.It transform test machine as) as figure
As forming equipment, the correspondence color bits that above-mentioned " developer 1~16 " is successively placed in developing apparatus is put, and homochromy supplement is developed
Agent is placed on corresponding position.Successively in ambient temperature and moisture (20 DEG C/50%RH)/low temperature and low humidity (10 DEG C/30%RH)/high temperature and humidity
20K/30K/30K/20K images are carried out under (30 DEG C/80%RH)/ambient temperature and moisture (20 DEG C/50%RH) environment and form experiment.
Pass through the carried charge of carrier and carrier bulk resistance on developer roll before and after 100K images formation experiments of measure completion
Rate evaluates carrier durability, for each assessment item, is evaluated as A, and when B represents qualified.Evaluation results are shown in Table 1.
Pollution, image density, bottom ash in machine are evaluated by completing 100K images formation experiments, to each evaluation
For project, it is evaluated as A, when B represents qualified.Evaluation result is shown in Table 2.
Carrier durability evaluation
Carrier carried charge Assessment of Changes
Carrier carried charge before and after durability test uses body of powder electrification amount determining device (model：TB-203, manufacturer：
Japanese Kyocera) it measures.By the ratio of carried charge before the absolute value of the difference of carried charge before and after durability test and durability test
It is defined as carried charge change rate.Evaluation results are shown in Table 1.
Carrier carried charge Assessment of Changes is carried out according to following Recording criteria.
A：Durability test front and back belt electric quantity change is extremely slight (being less than or equal to 5%), out of question in practical；
B：Durability test front and back belt electric quantity change is slight (be more than 5% and be less than or equal to 10%), out of question in practical；
C：Durability test front and back belt electric quantity change is apparent (be more than 10% and be less than or equal to 20%), does not ask in practical
Topic；
D：Durability test front and back belt electric quantity change is serious (being more than 20%), and there are problems in practical.
Carrier bulk change in resistance is evaluated
Volume resistivity uses teraohmmeter (model：SM-8220, manufacturer：Japanese HIOKI) it measures.Durability is tried
The ratio of absolute value of the difference and durability test front volume resistivity for testing front and rear volume resistivity is defined as volume resistivity change
Rate.Evaluation results are shown in Table 1.
Volume resistivity Assessment of Changes is carried out according to following Recording criteria.
A：Volume resistivity variation is extremely slight before and after durability test (being less than or equal to 5%), out of question in practical；
B：Volume resistivity variation is slight before and after durability test (be more than 5% and be less than or equal to 10%), does not have in practical
Problem；
C：Volume resistivity variation is apparent before and after durability test (be more than 10% and be less than or equal to 20%), does not have in practical
Problem；
D：Volume resistivity variation is serious before and after durability test (being more than 20%), and there are problems in practical.
Pollution evaluation in machine
Experiment is formed by completing 100K images, developing apparatus periphery is visually observed, according to carrier and toning
The situation of dispersing of agent evaluates pollution situation in machine.Evaluation result is shown in Table 2.
According to pollution evaluation in following Recording criteria carry out machine.
A：It does not observe by being polluted in the caused machine that disperses of carrier and toner, it is out of question in practical；
B：It observes by being polluted, but need not in maintenance in the atomic weak caused extremely slight machine that disperses of carrier and toner
It can be eliminated using dust catcher, it is out of question in practical；
C：It observes by being polluted, but need to use and inhale in maintenance in the faint caused slight machine that disperses of carrier and toner
Dirt device could be eliminated, out of question in practical；
D：It observes by being polluted in the apparent caused significantly machine that disperses of carrier and toner, needs to use in maintenance and inhale
Dirt device is simultaneously washed one's hands after the activation, and there are problems in practical.
Image relative density is evaluated
In A4 paper (80g/m2) on print solid monochrome image, the image density based on solid monochrome image region is commented
Valency.Image density is divided densimeter (model using U.S.'s X-Rite500 series：528, manufacturer：U.S. X-Rite) it measures.It surveys
Amount is relative to white background area (image density：0.00) relative density of image is printed.Evaluation result is shown in Table 2.
The evaluation of black toner print image relative density is carried out according to following Recording criteria.
A：It is very good (being more than more than 1.40), out of question in practical；
B：Well (it is more than 1.30 and is less than or equal to 1.40), it is out of question in practical；
C：Generally (it is more than 1.20 and is less than or equal to 1.30), it is out of question in practical；
D：Difference (is less than or equal to 1.20), and there are problems in practical.
Bottom ash is evaluated
Bottom ash is divided densimeter (model using U.S.'s X-Rite500 series：528, manufacturer：U.S. X-Rite) it measures.
It measures without image-text area relative to white background area (image density：0.00) relative density of image is printed.Evaluation result
It is shown in Table 2.
Bottom ash evaluation is carried out according to following Recording criteria.
A：It is very good (being less than or equal to 0.005), out of question in practical；
B：Well (it is more than 0.005 and is less than or equal to 0.008), it is out of question in practical；
C：Generally (it is more than 0.008 and is less than or equal to 0.010), it is out of question in practical；
D：Difference (is more than 0.010), and there are problems in practical.
Table 2
Machine result on developer of the present invention, which is can be seen that, from the result of embodiment 1~13 shows that pollution (pole) is micro- in machine
Weak, the image relative density before and after durability test changes small (carried charge stability is good), and bottom ash is small, does not ask in practical
Topic.
Copolymer used in clad is can be seen that without methyl methacrylate monomer unit from the result of comparative example 1~3
(such as：Carrier 14), copolymer used in clad without acrylic acid -2- carboxylics acetate monomer units (such as：Carrier 15) or cladding
Copolymer weight average molecular weight is more than 30 × 10 used in layer4(such as：Carrier 16), upper machine result, which is shown in machine, to be polluted, durability
There are problems in practical at least 1 in bottom ash three for the front and rear image relative density variation of experiment, and overall merit is not
It is qualified.
Claims (4)
1. a kind of resin-coated carrier, the clad including magnetic core material and coated magnetic core material, the clad are set containing bonding
Fat and conducting particles, which is characterized in that the binder resin is at least to contain methyl methacrylate and acrylic acid -2- carboxylic ethyl esters
The copolymer of two kinds of monomeric units, the binder resin are copolymerized for poly- (methyl methacrylate-(acrylic acid -2- carboxylics ethyl ester))
Object, poly- (Methyl Methacrylate-Styrene-(acrylic acid -2- carboxylics ethyl ester)) copolymer or poly- (methyl methacrylate-methyl
Cyclohexyl acrylate-(acrylic acid -2- carboxylics ethyl ester)) one kind in copolymer, and synthesize in the raw material monomer of the copolymer
The dosage of methyl methacrylate accounts for 1.0~90.0wt%, and the dosage of acrylic acid -2- carboxylic ethyl esters accounts for 0.1~10.0wt%.
2. resin-coated carrier as described in claim 1, which is characterized in that the binder resin weight average molecular weight is 5~30
Ten thousand.
3. resin-coated carrier as described in claim 1, which is characterized in that in the clad, relative to 100 mass parts
The binder resin, the conducting particles containing 3~30 mass parts.
4. a kind of two-component developing agent, which is characterized in that including toner and claim 1-3 any one of them resin packets
Cover carrier.
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Citations (1)
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|---|---|---|---|---|
| CN102608887A (en) * | 2012-03-02 | 2012-07-25 | 湖北鼎龙化学股份有限公司 | Manufacturing method of carrier for electrostatic image developer |
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| JP2010072209A (en) * | 2008-09-17 | 2010-04-02 | Fuji Xerox Co Ltd | Electrostatic charge image developing toner, method for manufacturing electrostatic charge image developing toner, electrostatic charge image developing developer, and image forming device |
| US8309293B2 (en) * | 2009-09-21 | 2012-11-13 | Xerox Corporation | Coated carriers |
| US8389191B2 (en) * | 2009-10-22 | 2013-03-05 | Xerox Corporation | Coated carriers |
| US8227163B2 (en) * | 2010-03-23 | 2012-07-24 | Xerox Corporation | Coated carriers |
| US8461252B2 (en) * | 2011-11-12 | 2013-06-11 | Xerox Corporation | Powder coated carrier |
| JP2013205491A (en) * | 2012-03-27 | 2013-10-07 | Fuji Xerox Co Ltd | Electrostatic latent image developing developer, developing device, image forming device, and image forming method |
| CN103365138B (en) * | 2013-06-24 | 2015-10-21 | 湖北鼎龙化学股份有限公司 | Carrier core material and manufacture method, carrier and electrostatic charge image developer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102608887A (en) * | 2012-03-02 | 2012-07-25 | 湖北鼎龙化学股份有限公司 | Manufacturing method of carrier for electrostatic image developer |
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Address after: 315500 No. 168, Nanshan North Road, Fenghua District, Ningbo City, Zhejiang Province Patentee after: Dinglong (Ningbo) new material Co.,Ltd. Address before: 315500 No. 168, Nanshan North Road, Fenghua District, Ningbo City, Zhejiang Province Patentee before: NINGBO FLEXITONE NEW MATERIALS Co.,Ltd. |