CN102063030A - Xerographic insulating dry single-component electropositive developer - Google Patents
Xerographic insulating dry single-component electropositive developer Download PDFInfo
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- CN102063030A CN102063030A CN2009102282891A CN200910228289A CN102063030A CN 102063030 A CN102063030 A CN 102063030A CN 2009102282891 A CN2009102282891 A CN 2009102282891A CN 200910228289 A CN200910228289 A CN 200910228289A CN 102063030 A CN102063030 A CN 102063030A
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Abstract
The invention relates to a xerographic insulating dry single-component electropositive developer for an electrostatic xerographic printer, which comprises the following components in percentage by weight: 40 to 80 percent of adhesive resin, 20 to 60 percent of magnetic material, 1 to 8 percent of charge controlling agent, 0.1 to 0.8 percent of internal additive and 0.1 to 0.8 percent of external additive, wherein the adhesive resin adopts a styrene-acrylic acid copolymer with the polymerization rate of 70:25:5, the average molecular weight of 0.1 to 0.2 million and the melt index MI of 1.5 to 5.5; the magnetic material adopts ferroferric oxide, and has the average particle size of 0.1 to 2.0 mu m, and magnetic characteristics such as the saturation magnetization of 60 to 100 emv/g and the coercive force of 90 to 1400 e in the magnetic field of 10 Koe; and the charge controlling agent adopts an aniline black dye. The developer simplifies processing technique and reduces the production cost, and can xerox images which have high concentration and high resolution with less bottom ash.
Description
Technical field
The present invention relates to a kind of xerox magnetic positive-charged developer, particularly a kind of positive electricity Xerox xerox insulated type dry type one-component positive-charged developer that is used for.
Background technology
In existing Xerox developer manufacturing technology, the magnetic ink powder class of producing is thinner, only is suitable for the Xerox of single type mostly, and the composition complexity of this magnetic ink powder, processing difficulties, and cost is higher.Selecting for use aspect the adhering resin, general multiselect is polymerized with the adhesive resin of two or more various criterion, this magnetic is owing to all have strict requirement and restriction to ink powder chargeding performance, magnetic property and powder characteristics and process, thereby make manufacturing process more complicated and strengthen cost of products, it is narrow that ink powder uses accommodation simultaneously, often can only be used for the duplicating machine of single type.
Summary of the invention
The object of the present invention is to provide a kind of picture depth height, resolution height, bottom ash is little and good endurance, to stronger, easy to process, the lower-cost xerox insulated type of multiple electropositivity duplicating machine applicability dry type one-component positive-charged developer.
Technical scheme of the present invention is that xerox insulated type dry type one-component positive-charged developer is made up of adhering resin, magnetic material, charged correctives and interior external additive, adhering resin is selected the styrene-propene acid copolymer for use, can also select styrene, 0-methyl styrene, N-methyl styrene, P-methyl styrene, P-Benzene Chloride ethene, 3 for use, 4-benzene dichloride ethene and each derivant; Unsaturated single hydro carbons such as ethene, propylene, butylene, isobutylene, ethlyene dichloride, ethylene bromide, ethylene fluoride, ethylene halide etc.; Two or more multipolymer in the acid of unsaturated olefins such as vinyl acetate, acrylic acid ethene.Magnetic material is selected tri-iron tetroxide for use, also can select other ferrites and iron oxide for use.Charged correctives is selected aniline black byestuffs for use.In add agent and select low-molecular polypropylene for use.Additive is selected hydrophobic silica for use.
Each component of developer constitutes weight ratio: adhering resin 40～80%, magnetic material 20～60%, charged correctives 1～8%, in add agent 0.1～0.8, additive 0.1～0.8%.
Specific requirement for the key component selection: it is 70: 25: 5 that adhesive resin is selected the polymerization ratio of styrene-propene acid copolymer for use, and the number mean molecular weight is 10～200,000, melting index 1.5～5.5.Magnetic material is selected tri-iron tetroxide for use, and its mean grain size is 0.1～2.0 μ m, the magnetic characteristic under the magnetic field of 10Koe: fullization intensity is 60～100emv/g, and coercive force is 90～140Oe.Additive is selected hydrophobic silica for use, and its hydrophobic deg is 20～40.
The making of developer is with above-mentioned adhering resin, magnetic material is through weighing, after the mixing, use special-purpose high precision mixing facilities constant temperature mixing, polypropylene, materials such as charge adjusting agent are distributed in the potpourri equably, raw material is through after mixing, again through cooling, precomminution, coarse crushing and micro mist are broken, semi-manufacture are made in classification, in the classification product, add additive in 3% ratio at last, promptly add hydrophobic silica, fully mix, again through sieving the aggregate of the trace that removes bulky grain and in mixed process, produce, the filling machine filling, packing forms formal product.
The invention has the beneficial effects as follows: both required performance index good in the selection, and considered simplified processing process again and reduce cost.Select the styrene-propene acid copolymer for use as adhering resin, the people of both having contained two kinds of different components is imitated composition, has improved the performance index of developer, has simplified production technology again and has reduced cost, enlarged the scope of application of developer simultaneously, the duplicating machine that is used for different types of machines is respond well.Charged correctives is selected aniline black byestuffs for use, stablizes on the one hand the carried charge of developer, on the other hand up to the effect of toner.In addition the hydrophobic deg of hydrophobic silica is controlled, in case the conglomeration of the developer moisture absorption influences photocopying effect.Because above improvement, make the developer copy image concentration height of acquisition, resolution height, bottom ash are little.
Embodiment
Specific embodiment-:
(weight ratio): MI is 100 parts of 3.0 styrene-propene acid copolymers, 60 parts of tri-iron tetroxides, 4 parts of low-molecular polypropylenes, 2 parts of aniline black byestuffses, through after weighing, mixing, use special-purpose high precision mixing facilities constant temperature mixing above-mentioned four kinds of raw materials, be distributed to materials such as polypropylene, charge adjusting agents in the potpourri equably, raw material is through after mixing, obtains the classification product of following size-grade distribution after broken through cooling, precomminution, coarse crushing and micro mist again, the classification:
The number average diameter: 6.43 μ m, below 5.04: 26.37%,
Volume mean diameter; 8.76 μ m 16.0 μ m above 0.05%
0.6 part of hydrophobic silica is added in the above-mentioned classification product, and fully mixing promptly obtains required developer.This developer is used for NP8500 and GP605 duplicating machine, and copy image is clear, and permanance is good.
Specific embodiment two:
(weight ratio): MI is 100 parts of 2.0 styrene-propene acid copolymers, 50 parts of tri-iron tetroxides, and 4 parts of low-molecular polypropylenes, 2 parts of aniline black byestuffses obtain the classification product of following size-grade distribution after will above-mentioned four kinds of methods processing by embodiment 1:
Number average diameter: 5.71m, below 5.04: 24.37%,
Volume mean diameter; 9.35 μ m 16.0 μ m above 1.20%
0.6 part of hydrophobic silica is added in the above-mentioned classification product, and fully mixing promptly obtains required developer.This developer is used for NP8500 and GP605 duplicating machine, and copy image is clear, and permanance is good.
Specific embodiment three: (weight ratio): MI is 100 parts of 4.5 styrene-propene acid copolymers, 70 parts of tri-iron tetroxides, 4 parts of low-molecular polypropylenes, 2 parts of aniline black byestuffses will obtain the classification product of following size-grade distribution after above-mentioned four kinds of method processing by embodiment 1:
Number average diameter: 5.71m, below 5.04: 24.37%,
Volume mean diameter; 9.35 μ m 16.0 μ m above 1.20%
0.6 part of hydrophobic silica is added in the above-mentioned classification product, and fully mixing promptly obtains required developer.This developer is used for NP8500 and GP605 duplicating machine, and copy image is clear, and permanance is good.
Claims (4)
1. xerox insulated type dry type one-component positive-charged developer is made up of adhering resin, magnetic material, charged correctives and interior external additive, it is characterized in that; Described adhering resin is selected the styrene-propene acid copolymer for use, described magnetic material is selected tri-iron tetroxide for use, described charged correctives is selected aniline black byestuffs for use, add agent in described and select low-molecular polypropylene for use, described additive is selected hydrophobic silica for use, and each component constitutes weight ratio and is: adhering resin 40～80%, magnetic material 20～60%, charged correctives 1～8%, in add agent 0.1～0.8, additive 0.1～0.8%.
2. xerox insulated type dry type one-component positive-charged developer as claimed in claim 1, it is characterized in that: it is 70: 25: 5 that described adhering resin is selected the polymerization ratio of styrene-propene acid copolymer for use, the number mean molecular weight is 10～200,000, melting index MI1.5～5.5.
3. xerox insulated type dry type one-component positive-charged developer as claimed in claim 1, it is characterized in that: described magnetic material is selected tri-iron tetroxide for use, its mean grain size is 0.1～2.0 μ m, magnetic characteristic under the magnetic field of 10Koe: saturation magnetization is 60～100emv/g, and coercive force is 90～140Oe.
4. xerox insulated type dry type one-component positive-charged developer as claimed in claim 1, it is characterized in that: it is 20～40 that described additive is selected the hydrophobic deg of hydrophobic silica for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102282891A CN102063030A (en) | 2009-11-16 | 2009-11-16 | Xerographic insulating dry single-component electropositive developer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102282891A CN102063030A (en) | 2009-11-16 | 2009-11-16 | Xerographic insulating dry single-component electropositive developer |
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| CN102063030A true CN102063030A (en) | 2011-05-18 |
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| CN2009102282891A Pending CN102063030A (en) | 2009-11-16 | 2009-11-16 | Xerographic insulating dry single-component electropositive developer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253617A (en) * | 2011-06-21 | 2011-11-23 | 天津市中环天佳电子有限公司 | Magnetic anti-forgery ink powder |
| CN103529669A (en) * | 2013-10-23 | 2014-01-22 | 天津市中环天佳电子有限公司 | Non-magnetic single-component electropositive color matching agent for laser printer |
-
2009
- 2009-11-16 CN CN2009102282891A patent/CN102063030A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253617A (en) * | 2011-06-21 | 2011-11-23 | 天津市中环天佳电子有限公司 | Magnetic anti-forgery ink powder |
| CN103529669A (en) * | 2013-10-23 | 2014-01-22 | 天津市中环天佳电子有限公司 | Non-magnetic single-component electropositive color matching agent for laser printer |
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Application publication date: 20110518 |