CN104111597A - Resin coated carrier and dual-component developer - Google Patents
Resin coated carrier and dual-component developer Download PDFInfo
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- CN104111597A CN104111597A CN201410289179.7A CN201410289179A CN104111597A CN 104111597 A CN104111597 A CN 104111597A CN 201410289179 A CN201410289179 A CN 201410289179A CN 104111597 A CN104111597 A CN 104111597A
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Abstract
The invention relates to a resin-coated carrier and a double-component developing agent. The problem that the picture quality of an image is low due to shedding of a coating layer from a magnetic core material during a long-term usage of an existing resin-coated carrier and changed electric quantity of a color matching agent by the carrier when the environment changes can be solved. The carrier comprises the magnetic core material and the coating layer covering the magnetic core material, wherein the coating layer comprises adhesive resin and conductive particles, the adhesive resin is a copolymer containing at least two monomer units of methyl methacrylate and acrylic acid-2-carboxylethyl acrylate, and the monomer raw materials for synthesizing the copolymer comprise 1.0-95.0wt% of methyl methacrylate and 0.1-10.0wt% of acrylic acid-2-carboxylethyl acrylate. According to the invention, shedding of the coating layer from the magnetic core material during long-term usage of the resin-coated carrier is difficult, stable electric quantity can be provided to the color matching agent even the environment changes, the developer has good endurance for being used in an image formation apparatus, and the degradation of the picture quality of the image is suppressed.
Description
Technical field
The present invention relates to can be used in the resin-coated carrier in electrostatic image development field, and the two-component developing agent that contains this resin-coated carrier.
Background technology
In electrostatic image development field, the two-component developing agent system being made up of carrier and toner is stable because easily realizing toner carried charge, obtains high resolution image, thereby is used widely in fields such as high-speed printer (HSP), duplicating machine, all-in-one multifunctional machines.The carrier of two-component developing agent comprises the magnetic carrier and the resin-coated carrier that has coated with resin clad without coated with resin clad, compared with the magnetic carrier without coated with resin clad, that the resin-coated carrier being made up of magnetic core and its surface-coated resin-coating layer has is adjustable, easily obtain high definition image quality becomes main flow gradually.
Resin-coated carrier clad prevents that carrier surface from polluting, and the variation of inhibition zone electric weight, adjusts developer resistance, and reduces the effect that carried charge distributes.When long-term use, resin-coating layer comes off from magnetic core surface, cause carrier resistance to reduce, the resin chips simultaneously coming off can hinder the normal frictional electrification of toner and carrier, causes carrier to give toner carried charge and changes, and brings the degradation phenomena of image quality.For the example that inhibition resin-coating layer comes off, gives the resin-coated carrier of the stable carried charge of toner from magnetic core surface can be enumerated patent documentation 1～3.
In patent documentation 1 (application number 201010510269.6), disclosing a kind of clad resin is that the multipolymer with ad hoc structure is hydrolyzed to produce silanol and utilizes organic titanic compound to carry out the cross-linked material that condensation obtains.
In patent documentation 2 (application number 201010248477.3), disclosing a kind of clad resin is the polymkeric substance that contains acryl resin, polyvalent alcohol and the isocyanates with hydroxyl side chain.
In patent documentation 3 (application number 200980107547.9), disclose a kind of clad resin and at least comprised the acrylic compounds macromonomer that there is the acrylic monomer of ad hoc structure and the there is ad hoc structure multipolymer as copolymerization component.
Although the disclosed clad resin of above-mentioned patent documentation 1～2 itself has formed cross-linked structure, but do not form chemical bond between clad resin and magnetic core, when long-term use, clad resin can come off from magnetic core surface, cause carrier resistance to reduce, the resin chips coming off and exposed magnetic core can bring carrier to give the variation of toner carried charge, bring the deteriorated of image quality.The disclosed clad resin of above-mentioned patent documentation 3 is thermoplastic resin, and there is certain cohesive force on coated initial resin and magnetic core surface, but final cohesive force is poor, uses especially for a long time, and clad resin easily comes off from magnetic core surface.
Summary of the invention
The object of the invention is, in order to solve the problems of the technologies described above, provides a kind of resin-coated carrier.
The present invention also provides a kind of two-component developing agent that contains above-mentioned resin-coated carrier.
Resin-coated carrier of the present invention, comprise the clad of magnetic core and coated magnetic core, described clad is containing binder resin and conducting particles, described binder resin is the multipolymer that at least contains methyl methacrylate and two kinds of monomeric units of acrylic acid-2-carboxylic ethyl ester, and in the raw material monomer of synthetic described multipolymer, the consumption of methyl methacrylate accounts for 1.0～95.0wt%, and the consumption of acrylic acid-2-carboxylic ethyl ester accounts for 0.1～10.0wt%.
Further, in described clad, with respect to the described binder resin of 100 mass parts, the conducting particles that contains 3～30 mass parts.
The inventor finds by research experiment: the present invention adds acrylic acid-2-carboxylic ethyl ester in the raw material monomer of synthetic copolymer, carboxylic acid in multipolymer on acrylic acid-2-carboxylic ethyl ester monomeric unit can with iron chelating in magnetic core ferrite, increase the cohesive force between binder resin and magnetic core, suppress clad and come off from magnetic core; In the raw material monomer of synthetic copolymer, add methyl methacrylate, utilize the In frared spectra of methyl, can strengthen carrier and give ability to the negative charge of toner, in addition raw material monomer acrylic acid-2-carboxylic ethyl ester and methyl methacrylate exist polarity poor, two kinds of monomeric units in copolymerization and multipolymer easily occur for the two alternately tendency, can suppress carrier and give toner carried charge and change in the time of environmental change.
In the present invention, in the raw material monomer of synthetic described multipolymer (adding up to 100wt%), the consumption of methyl methacrylate is preferably 1.0～95.0wt%, more preferably 10.0～60.0wt%.The consumption of methyl methacrylate is less than 1.0wt%, and it is low that carrier is given toner carried charge; The consumption of methyl methacrylate is greater than 95.0wt%, and binder resin water wettability strengthens, and carrier is given toner carried charge and reduced.In the present invention, in the raw material monomer of synthetic described multipolymer, the consumption of acrylic acid-2-carboxylic ethyl ester is preferably 0.1～10.0wt%, more preferably 0.3～5.0wt%.The consumption of acrylic acid-2-carboxylic ethyl ester is less than 0.1wt%, and the cohesive force deficiency between binder resin and magnetic core is used clad easily to come off from magnetic core for a long time; The consumption of acrylic acid-2-carboxylic ethyl ester is greater than 10.0wt%, and binder resin water wettability strengthens, and carrier is given toner carried charge and reduced.
Binder resin of the present invention is the one in poly-(methyl methacrylate-(acrylic acid-2-carboxylic ethyl ester)) multipolymer, poly-(Methyl Methacrylate-Styrene-(acrylic acid-2-carboxylic ethyl ester)) multipolymer or poly-(methyl methacrylate-cyclohexyl methacrylate-(acrylic acid-2-carboxylic ethyl ester)) multipolymer.Wherein preferably gather (methyl methacrylate-cyclohexyl methacrylate-(acrylic acid-2-carboxylic ethyl ester)) multipolymer.
In the present invention, the multipolymer that binder resin uses can use well-known method manufacture, can enumerate emulsion 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 preferably 80,000～250,000.Weight-average molecular weight is less than 50,000, uses for a long time carrier to give toner carried charge and easily changes; Weight-average molecular weight is greater than 300,000, and the initial adhesion power variation between binder resin and magnetic core, is used clad easily to come off from magnetic core for a long time.
Conducting particles of the present invention can be the one in carbon black, tin oxide, titanium dioxide, zinc paste, aluminium oxide.Wherein preferred carbon black.
In the present invention, conducting particles particle diameter is 0.01～0.35 μ m preferably, more preferably 0.03～0.30 μ m.Conducting particles particle diameter is less than 0.01 μ m, easily aggegation between conducting particles, and conducting particles is skewness in clad, and carrier is given the distribution of toner carried charge and is broadened; Conducting particles particle diameter is greater than 0.35 μ m, and conducting particles easily comes off from clad, and toner is easily adsorbed on carrier cover surface, and image density reduces.
In the present invention, conducting particles consumption is preferably 3～30% of described binder resin quality, and more preferably 5～20% of described binder resin quality.Conducting particles content is lower than 3%, and toner is easily adsorbed on carrier cover surface, and image density reduces; Conducting particles content is higher than 30%, and carrier is charged, carrier easily occurs and adhere to.
In the present invention, not affecting in the zone of reasonableness of aim of the present invention, can also tool in clad need to add in fact other adjuvant, as carried charge controlling agent, common carried charge controlling agent can be enumerated organic siliconresin, fluororesin, phenolics, unsaturated polyester (UP), epoxy resin, Lauxite, melamine resin, polyurethane.
The present invention is not particularly limited for the manufacture of the method for resin-coated carrier, can be known any method, and coated can the enumerating of wet method makes carrier core be soaked in the infusion process in clad dispersion liquid; Clad dispersion liquid is sprayed to the spray-on process on carrier core; Utilize the fluidized bed process of air flow to the carrier core spray coated layer dispersion liquid of suspended state; Coated can the enumerating of dry method adds carrier core to utilize coated dry bag method of impulsive force etc. clad component.
Concrete example can be enumerated: obtains clad dispersion liquid as first binder resin, conducting particles added in toluene, then carrier core is immersed in clad dispersion liquid, and then evaporating solvent, sieve classification, obtains resin-coated carrier; Or binder resin, conducting particles are directly joined in carrier core and mixed, then utilize impulsive force to make resin combination in the bonding extension in surface of carrier core, then sieve classification, obtains resin-coated carrier.
Preferably 0.05～3 μ m of coating thickness that the present invention forms, more preferably 0.1～2 μ m.Coating thickness is less than 0.05 μ m, and toner, additive can be attached to exposed magnetic core surface; Coating thickness is greater than 3 μ m, and toner is easily adsorbed on carrier cover surface, and image density reduces.For reaching certain coated thickness and clad ratio, the quality consumption of binder resin is preferably 1～5 mass parts with respect to magnetic core 100 mass parts.
The magnetic core material particle that the present invention uses, can use well-known magnetic particle, can enumerate Mn based ferrite, Mn-Mg based ferrite, Mn-Mg-Sr based ferrite.In the time containing Mn, magnetic core can obtain high saturation and magnetic intensity, can reduce magnetic core proportion in the time containing Mg, can improve magnetic core saturation magnetization in the time containing Sr.
In the present invention, magnetic core particle volume intermediate value footpath (D
50) preferably 15～80 μ m, more preferably 20～60 μ m.Magnetic core particle diameter is less than 15 μ m, easily aggegation between magnetic core material particle; Magnetic core particle diameter is greater than 80 μ m, is difficult to obtain stable high resolution image.
In the present invention, preferably 30～100emu/g of magnetic core material particle saturation magnetization, more preferably 50～80emu/g.Saturation magnetization is lower than 30emu/g, and carrier may be developed in photosensitive drums together with toner; Saturation magnetization is higher than 100emu/g, and carrier is difficult for mobile on developer roll.
In the present invention, magnetic core particle volume resistivity preferably 1 × 10
3～1 × 10
11Ω cm, more preferably 1 × 10
5～1 × 10
9Ω cm.Magnetic core particle volume resistivity is lower than 1 × 10
3Ω cm, toner carried charge may reduce, and carrier easily occurs and adhere to; Magnetic core particle volume resistivity is higher than 1 × 10
11, easily there is toner and be attached on carrier in Ω cm, image density reduces.
Two-component developing agent of the present invention comprises toner and above-mentioned resin-coated carrier.
The manufacture method of described toner is not particularly limited, and forms matching requirements as long as meet electrostatic image, can use existing the whole bag of tricks as comminuting method, be suspended polymerization, emulsification agglutination, dissolve and be suspended the manufacture method such as method and polyester extension method.
Beneficial effect:
Resin-coated carrier of the present invention, by use the multipolymer that contains acrylic acid-2-carboxylic ethyl ester and two kinds of monomeric units of methyl methacrylate in clad binder resin, improve the cohesive force between clad resin and magnetic core, in the time of environmental change, can suppress carrier and give toner carried charge and change.Resin-coated carrier of the present invention clad in the time of long-term use is difficult for coming off from magnetic core, even if environmental change also can give toner stable carried charge, developer of the present invention, for image processing system good endurance, can suppress the deteriorated of image quality.
Embodiment
Hereinafter, except being otherwise noted, record " part ", " % " represent respectively " mass parts ", " quality % ".
The manufacture of magnetic core
By 72.5mol%Fe
2o
3, 8.3mol%Mn
3o
4, 19.2mol%MgO is converted into required di-iron trioxide, mangano-manganic oxide, magnesian quality, then weighs and mixes, and makes the amount of substance of product constituent reach aforementioned proportion value.Then in above-mentioned support core material raw material, add the aqueous solution of appropriate poly carboxylic acid ammonium spreading agent and the aqueous solution of polyvinyl alcohol (PVA) binder, stirring makes 50% slurries, these slurries are ground to 2h in commercially available circulating agitating ball mill, obtain volume intermediate value footpath (D
50) be the mixed slurry of 1.0 μ m.This mixed slurry is carried out to granulation processing with commercially available spray dryer, and obtaining particle diameter is the preformed particle of 10～100 μ m, then, from room temperature, by 120 DEG C/h, rises to 920 DEG C, and insulation 2h is cooling with stove, is down to room temperature and comes out of the stove, and makes presintering thing.Presintering thing is carried out to break process with commercially available mechanical crusher, obtain the basically identical presintering composition granule of target grain size.
Then in the presintering composition granule of crossing to 100 parts of break process, add 0.11 part of CaO and 0.01 part of SiO on one side
2, stir the potpourri that obtains presintering thing; On one side to the polyvinyl alcohol (PVA) binder that adds 0.25 part of poly carboxylic acid ammonium spreading agent and 5.0 part 10.0% in water, drop into wherein again the potpourri of above-mentioned this presintering thing, stirring obtains 50% slurries, then in commercially available circulating agitating ball mill, grinds 3h, obtains volume intermediate value footpath (D
50) be the particle slurry of 1.0 μ m, then carry out granulation processing with commercially available spray dryer, obtaining particle diameter is the granules particle of 10～100 μ m, then from room temperature, by 50 DEG C/h, rise to 450 DEG C, insulation 2h, then, by 120 DEG C/h, rises to 800 DEG C, insulation 2h, then by 50 DEG C/h, rise to 1240 DEG C, insulation 2h, cooling with stove, be down to room temperature and come out of the stove.Then with mechanical crusher, double sintering thing is carried out to break process, sieve and remove out coarse particle with 325 object SUS screen clothes, remove out fine grained by air classification, then use electromagnetic separator from carrier core material particle, to sub-elect the weak particle of magnetic force, obtain volume intermediate value footpath (D
50) be 38 μ m, the carrier core material particle that saturation magnetization is 60emu/g, specific insulation is 1 × 10
9the 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-(acrylic acid-2-carboxylic ethyl ester)) multipolymer, Mw:25 × 10
4), 0.53 part of carbon black puts into 100 parts of magnetic cores (volume intermediate value footpath D
50: 38 μ m, saturation magnetization: 60emu/g, specific insulation: 1 × 10
9Ω cm) in, stir and evenly mix, adopt dry method to be coated, after upper coated, being coated, sieves by granulating machine (model: NMG-10L, manufacturer: Japanese NARA) air classification with 325 object SUS screen clothes.The carrier obtaining is called resin-coated carrier 1.
The manufacture of resin-coated carrier 2～6
In the manufacture of resin-coated carrier 1, except binder resin kind, copolymerization component copolymerization mass ratio, molecular weight and binder resin consumption, conducting particles carbon black loading are changed to shown in table 1, the identical resin-coated carrier 2～6 that obtains of other conditions.
The manufacture of resin-coated carrier 7
By 2.00 parts of P (MMA-CHMA-(β-CEA)) (poly-(methyl methacrylate-cyclohexyl methacrylate-(acrylic acid-2-carboxylic ethyl ester)) multipolymer, Mw:8 × 10
4) be dissolved in 40 parts of toluene, then add 0.20 part of carbon black stirring and make clad dispersion liquid, then in this clad dispersion liquid, add 100 parts of magnetic cores (volume intermediate value footpath D
50: 38 μ m, saturation magnetization: 60emu/g, specific insulation: 1 × 10
9Ω cm), adopt infusion process, upper coated at kneader (model: HKD2.5, manufacturer: German IKA), coated rear except desolventizing, then by 325 object SUS screen cloth screenings, air classification.The carrier obtaining is called resin-coated carrier 7.
The manufacture of resin-coated carrier 8～13
In the manufacture of resin-coated carrier 7, except binder resin kind, copolymerization component copolymerization mass ratio, molecular weight and binder resin consumption, conducting particles carbon black loading are changed to shown in table 1, the identical resin-coated carrier 8～13 that obtains of other conditions.
The manufacture of resin-coated carrier 14
In the manufacture of resin-coated carrier 1, except charge-coupled point of methylate methyl acrylate copoly not, the identical resin-coated carrier 14 that obtains of other conditions.
The manufacture of resin-coated carrier 15
In the manufacture of resin-coated carrier 1, except not adding acrylic acid-2-carboxylic ethyl ester copolymerization component, the identical resin-coated carrier 15 that obtains of other conditions.
The manufacture of resin-coated carrier 16
In the manufacture of resin-coated carrier 1, except binder resin molecular weight is changed to 40 × 10
4in addition, the identical resin-coated carrier 16 that obtains of other conditions.
Table 1
In table:
(1): P (MMA-CHMA-(β-CEA)), poly-(methyl methacrylate-cyclohexyl methacrylate-(acrylic acid-2-carboxylic ethyl ester)) multipolymer
(2): P (MMA-St-(β-CEA)), poly-(Methyl Methacrylate-Styrene-(acrylic acid-2-carboxylic ethyl ester)) multipolymer
(3): P (MMA-(β-CEA)), poly-(methyl methacrylate-(acrylic acid-2-carboxylic ethyl ester)) multipolymer
(4): P (CHMA-(β-CEA)), poly-(cyclohexyl methacrylate-(acrylic acid-2-carboxylic ethyl ester)) multipolymer
(5): P (MMA-CHMA), poly-(methyl methacrylate-cyclohexyl methacrylate) multipolymer
As can be seen from Table 1, the carried charge of carrier of the present invention before and after endurancing changes and specific insulation changes slightly, no problem in practical.As can be seen from Table 1, carrier 14 clad multipolymer used is not containing methyl methacrylate monomer unit, and carrier 15 clad multipolymer used is not containing acrylic acid-2-carboxylic ethyl ester monomeric unit, and carrier 16 clad multipolymer weight-average molecular weight used is 40 × 10
4(be greater than 30 × 10
4), test result shows that the carried charge of carrier 14～16 before and after the endurancing changes and specific insulation has at least 1 to have problems in practical in changing the two, comprehensive evaluation is defective.
Embodiment 1～13
Above-mentioned " resin-coated carrier 1～13 " and " toner " are mixed as follows, manufacture embodiment bi-component " developer 1～13 ".Make 92 parts of carriers in mixer, mix 10min with 8 parts of toners, prepare two-component developing agent; Above-mentioned with 5 parts to 95 parts " toners " " resin-coated carrier 1～13 " mixed simultaneously, prepare 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 ".Make 92 parts of carriers in mixer, mix 10min with 8 parts of toners, prepare two-component developing agent; Above-mentioned with 5 parts to 95 parts " toners " " resin-coated carrier 14～16 " mixed simultaneously, prepare replenishment developer.
Developer is evaluated
Use commercially available color copy machine (print speed: colored 65ppm, black and white 65ppm.Transform test machine as) as image forming apparatus, the corresponding color bits that above-mentioned " developer 1～16 " is successively placed in developing apparatus is put, and homochromy replenishment developer is placed on to corresponding position.Under ambient temperature and moisture (20 DEG C/50%RH)/low temperature and low humidity (10 DEG C/30%RH)/hot and humid (30 DEG C/80%RH)/ambient temperature and moistures (20 DEG C/50%RH) environment, carry out successively 20K/30K/30K/20K and open image formation test.
Complete 100K by mensuration and open image and form before and after test carried charge and the carrier bulk resistivity of carrier on developer roll carrier permanance is evaluated, for each assessment item, be evaluated as A, it is qualified when B, to represent.Evaluation result is in table 1.
By complete 100K open image form test machine internal contamination, image density, bottom ash are evaluated, for each assessment item, be evaluated as A, it is qualified when B, to represent.Evaluation result is in table 2.
Carrier durability evaluation
Belt carrier electric quantity change is evaluated
Belt carrier electric weight before and after endurancing uses body of powder electrification amount determining device (model: TB-203, manufacturer: Japanese Kyocera) to measure.The ratio of carried charge before the absolute value of the difference of endurancing front and back belt electric weight and endurancing is defined as to carried charge rate of change.Evaluation result is in table 1.
Carry out the evaluation of belt carrier electric quantity change according to Recording criteria below.
A: endurancing front and back belt electric quantity change is slight (being less than or equal to 5%) extremely, out of question in practical;
B: endurancing front and back belt electric quantity change slight (be greater than 5% and be less than or equal to 10%), out of question in practical;
C: endurancing front and back belt electric quantity change is (be greater than 10% and be less than or equal to 20%) obviously, out of question in practical;
D: endurancing front and back belt electric quantity change serious (being greater than 20%), in practical existing problems.
Carrier bulk change in resistance is evaluated
Specific insulation uses teraohmmeter (model: SM-8220, manufacturer: Japanese HIOKI) to measure.The absolute value of difference and the ratio of endurancing front volume resistivity of specific insulation before and after endurancing are defined as to specific insulation rate of change.Evaluation result is in table 1.
Carry out specific insulation Assessment of Changes according to Recording criteria below.
A: extremely slight (being less than or equal to 5%) of volume change in resistance before and after endurancing, out of question in practical;
B: volume change in resistance slight (be greater than 5% and be less than or equal to 10%) before and after endurancing, out of question in practical;
C: obviously (be greater than 10% and be less than or equal to 20%) of volume change in resistance before and after endurancing, out of question in practical;
D: volume change in resistance serious (being greater than 20%), in practical existing problems before and after endurancing.
Machine internal contamination is evaluated
Open image formation test by completing 100K, developing apparatus periphery is carried out to visual inspection, according to the situation of dispersing of carrier and toner, machine internal contamination situation is evaluated.Evaluation result is in table 2.
Carry out machine internal contamination evaluation according to Recording criteria below.
A: do not observe the machine internal contamination being caused by dispersing of carrier and toner, out of question in practical;
B: observe the extremely slight machine internal contamination causing by dispersing a little less than carrier and toner atomic, but in the time of maintenance without using suction cleaner to eliminate, out of question in practical;
C: observe the faint slight machine internal contamination of dispersing and causing by carrier and toner, but need use suction cleaner to eliminate in the time of maintenance, out of question in practical;
D: observe the remarkable machine internal contamination being caused by obviously dispersing of carrier and toner, need to use suction cleaner and wash one's hands after operation in the time of maintenance, existing problems in practical.
Image relative density is evaluated
At A4 paper (80g/m
2) on print solid monochrome image, based on the image density evaluation in solid monochrome image region.Image density use U.S. X-Rite500 series light splitting Density Measuring Instrument (model: 528, manufacturer: U.S. X-Rite) measure.Measure with respect to white background region (image density: the relative density that 0.00) prints image.Evaluation result is in table 2.
Carry out the evaluation of black toner print image relative density according to Recording criteria below.
A: very good (being greater than more than 1.40), out of question in practical;
B: good (be greater than 1.30 and be less than or equal to 1.40), out of question in practical;
C: general (be greater than 1.20 and be less than or equal to 1.30), out of question in practical;
D: poor (being less than or equal to 1.20), in practical existing problems.
Bottom ash is evaluated
Bottom ash use U.S. X-Rite500 series light splitting Density Measuring Instrument (model: 528, manufacturer: U.S. X-Rite) measure.Measure without image-text area with respect to white background region (image density: the relative density that 0.00) prints image.Evaluation result is in table 2.
Carry out bottom ash evaluation according to Recording criteria below.
A: very good (being less than or equal to 0.005), out of question in practical;
B: good (be greater than 0.005 and be less than or equal to 0.008), out of question in practical;
C: general (be greater than 0.008 and be less than or equal to 0.010), out of question in practical;
D: poor (being greater than 0.010), in practical existing problems.
Table 2
Can find out from the result of embodiment 1～13, it is faint that on developer of the present invention, machine result demonstrates machine internal contamination (utmost point), image relative density before and after endurancing changes little (carried charge good stability), and bottom ash is little, no problem in practical.
Can find out from the result of comparative example 1～3, clad multipolymer used is not for example, containing methyl methacrylate monomer unit (: carrier 14), clad multipolymer used is not for example, containing acrylic acid-2-carboxylic ethyl ester monomeric unit (: carrier 15), or clad multipolymer weight-average molecular weight used is greater than 30 × 10
4(for example: carrier 16), upper machine result demonstrates machine internal contamination, has 1 existing problem in practical in the image relative density variation before and after endurancing and bottom ash three at least, and comprehensive evaluation is defective.
Claims (5)
1. a resin-coated carrier, comprise the clad of magnetic core and coated magnetic core, described clad is containing binder resin and conducting particles, it is characterized in that, described binder resin is the multipolymer that at least contains methyl methacrylate and two kinds of monomeric units of acrylic acid-2-carboxylic ethyl ester, and in the raw material monomer of synthetic described multipolymer, the consumption of methyl methacrylate accounts for 1.0～95.0wt%, and the consumption of acrylic acid-2-carboxylic ethyl ester accounts for 0.1～10.0wt%.
2. resin-coated carrier as claimed in claim 1, it is characterized in that, described binder resin is the one in poly-(methyl methacrylate-(acrylic acid-2-carboxylic ethyl ester)) multipolymer, poly-(Methyl Methacrylate-Styrene-(acrylic acid-2-carboxylic ethyl ester)) multipolymer or poly-(methyl methacrylate-cyclohexyl methacrylate-(acrylic acid-2-carboxylic ethyl ester)) multipolymer.
3. resin-coated carrier as claimed in claim 1, is characterized in that, described binder resin weight-average molecular weight is 5～300,000.
4. resin-coated carrier as claimed in claim 1, is characterized in that, in described clad, with respect to the described binder resin of 100 mass parts, the conducting particles that contains 3～30 mass parts.
5. a two-component developing agent, is characterized in that, comprises the resin-coated carrier described in toner and claim 1-4 any one.
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| CN103102495A (en) * | 2011-11-12 | 2013-05-15 | 施乐公司 | Powder coated carrier |
| 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 |
| CN103365139A (en) * | 2012-03-27 | 2013-10-23 | 富士施乐株式会社 | Electrostatic latent image developer, developing apparatus, image forming apparatus and image forming method |
| CN103365138A (en) * | 2013-06-24 | 2013-10-23 | 湖北鼎龙化学股份有限公司 | Carrier core material and manufacturing method thereof, carrier and electrostatic charge image developing agent |
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