JPS60118851A - Color toner - Google Patents

Abstract

PURPOSE:To prevent repulsion of toners from each other and to improve resolving power by distributing uniformly a charge control agent having a positive polarity in a color toner consisting of a polyester resin of a type electrifying to a negative polarity and a coloring material so as to expose a part of said agent on the surface. CONSTITUTION:(A) 100pts.wt. a polyester resin of a type electrifying to a negative polarity, (B) about 1-15pts.wt. a coloring agent (e.g.; benzidine yellow G, methyl violet lake) and (C) 0.05-0.7pts.wt. a charge control agent having a positive polarity and <=3mum average grain size (e.g.; nigrosine base) are uniformly mixed so as to expose a part of the C component thereby forming the intended color toner. The charge control agent having a positive polarity is thus uniformly distributed so as to expose a part thereof on the surface and therefore the repulsion of the toners from each other is suppressed without spoiling the quantity of friction electrification as the whole toner and the scattering of the toner in the periphery of the image, the blurring of the image, etc. are suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a color toner. In particular, the present invention relates to a color toner using a negatively charged polyester resin as a binder resin.

Conventional technology polyester resin. in general. It itself has a sufficient amount of negative triboelectric charge. On the other hand. Polyhydric carboxylic acid that can be used as an esterifying agent. There are many types of polyhydric alcohols. Therefore, the electromagnetic and thermal properties of polyester resins obtained using these esterifying agents can be freely adjusted. Therefore, matching between the copying machine and the toner becomes easy. If polyester resin is used as a binder resin in toner, it can improve image characteristics, reduce maintenance, and save energy. It becomes possible to fully meet market demands such as higher speeds. However, this polyester resin has a large negative charging characteristic.
When this is used as a binder resin for a toner, the negative charge characteristics of the polyester resin on the surface of the toner particles make the distribution of negative charges too uniform, causing the 9-polar toner particles in the toner image developed on the electrostatic latent image to overlap each other. Repulse each other.

This causes toner scattering and image blurring in the periphery of the image.

OBJECTS OF THE INVENTION An object of the present invention is to provide a color toner using a polyester resin as a resin binder. The object of the present invention is to disperse positive charges caused by a positive charge control agent in the uniform distribution of negative charges on the toner surface made of polyester resin, thereby preventing toners from repelling each other and producing color with excellent resolution. The goal is to provide toner.

SUMMARY OF THE INVENTION In the present invention, the reason why the resolution of the color toner using polyester resin as a binder is low is because the amount of 9-polar charge of the polyester resin is large and the negative charge on the toner surface is too uniform. This is the result of opposing each other.

By interspersing the positive charges caused by the positive charge control agent in the distribution of negative charges on the surface of the toner particles, the repulsion between the toners is suppressed and the resolution is improved without damaging the amount of triboelectric charge of the toner as a whole. improves. This was completed based on the findings of the present inventor. Therefore, (1) the color toner of the present invention has a positive polarity charge of 0.05 to 0.7 parts by weight per 100 areas of 1M polyester resin in a color toner mainly composed of a negatively charged polyester resin and a colorant. The above object is achieved by uniformly distributing the control agent so that a portion thereof is exposed on the surface.

The polyester resin used as a binder in the present invention is obtained, for example, by condensation polymerization of a diol component represented by the following general formula and a polyhydric carboxylic acid, its acid anhydride, or a derivative thereof as an acid component. Polyester 6111& thus obtained is preferably used in terms of non-offset properties and fixing properties: CH.

Here, ``rei'' is an ethylene group or a propylene group, and 9m
and n is a positive integer.

As the diol component represented by the above general formula (1),
Polyoxypropylene-2,2-bis(4-hydroxyphenyl)propane; Polyoxyethylene-2,2-bis(4-hydroxyphenyl)propane; Polyoxypropylene-polyoxyethylene-2,2-bis(4- Examples include hydroxyphenyl)propane. Carboxylic acid components include maleic acid, fumaric acid,
Mesaconic acid, citraconic acid, itaconic acid, glutaconic acid, phthalic acid, isophthalic acid, terephthalic acid, cyclohexanedicarboxylic acid, succinic acid, adipic acid, cepatic acid, malonic acid, liluic acid, l+2τ4 benzenetricarboxylic acid, l・2・5benzenetricarboxylic acid, 1τ
2.4 cyclohexanetricarboxylic acid, 2.5.7 naphthalenetricarboxylic acid, 1.2.4 naphthalenetricarboxylic acid.

1.2:5 hexanetricarboxylic acid, 1.2.4 butanetricarboxylic acid, 1+3-dicarboxy-2-methylcarboxypropene, 1.3-dicarboxy-2-methyl-2-methylcarboxypropane tetra[methylenecarboxy] Mention may be made of methane, 1.2I718 octane tetracarboxylic acid, embol trimer and acid anhydrides thereof.

In the condensation polymerization of the diol component and the polycarboxylic acid component, the number of carboxyl groups in the carboxylic acid component is 1.2 to 0.
8. In particular, it is preferably 1.1 to 0.9. For example, the catalyst at that time is 2.

tin oxide, zinc oxide, titanium oxide, dibutyltin oxide,
Dibutyltin diurarate and the like may be used. Further, in addition to the etherified bisphenol represented by the general formula +11F-, a diol component of 1113 such as ethylene glycol and bisphenol A can be used in combination within a range of 10 molar ratio or less.

Coloring agents used in the present invention include, for example, the following organic pigments: Yellow pigments: Hansa Yellow G; Hansa Yellow 10G; Hansa Yellow GR Den Hanser Yellow 5Gi H゛Chi Yellow 3G; Benzidine Yellow G; Benzidine yellow G
R; Quinoline Yellow Lake; Permanent Yellow NCG
.

Orange pigment: Permanent Orange GTR + Pyrazolone Orange; Palkan Orange; Indanthrene Brilliant Orange RKi Benzidine Orange G; Indanthrene Brilliant Orange GKi Palkan Orange.

Red pigments: Brilliant first scarlet; Permanent red 4; Lysole red; Pyrazolone red; Watching red calcium salt; Lake red D; Brilliant carmine 6Bi eosin lake; Rhodamine lake B; Alizarin lake Brilliant carmine 3B; Toluidine red: Permanent red F4RH.

Purple pigment: Fast Violet B; Methyl Violet Lake;
Crystal Violet Lake; Rhodamine B.

Blue pigments: Victoria Blue Lake; Phthalocyanine Blue 1 Metal Free Phthalocyanine Blue; Phthalocyanine Blue Partially Chlorinated Product; Fast Sky Blue; Indan Stremburu-BC, and.

Green pigments: Pigment Green B; Malachite Green Lake; Final Yellow Green G; Diamond Green Lake: Green Gold; Phthalocyanine Green.

The above-mentioned organic pigments are used in an amount of 1 to 15 parts by weight per 100 parts by weight of the polyester resin.

If the amount is less than the above range, the color tone as a color toner will not be maintained. If the amount exceeds the above range, the pigment itself may be released from the resin binder and contaminate the carrier.

The positive charge control agent used in the present invention is:

A positive load is dotted in the distribution of negative charges on the surface of the toner particles without significantly reducing the amount of negative charges possessed by the polyester resin as a binder.The amount used is 100 parts by weight of the polyester resin. 0.0
It is 5 to 0.7 weight parts, preferably 0.1 to 0.5 weight parts. If the positive polarity control agent is used too little [phase],
Uniform distribution of negative charges on the toner particle surface cannot be prevented. If it is too large, the amount of charge on the toner decreases, making it impossible to obtain the desired single-top image.

As the positively charged side f-agent, it is positively charged and hangs due to friction with the carrier, such as Nioleosole Blue G (C, I+8o1vent B), which has the following properties.
11).

Oriental Oilb/l/-K (C, I, 5o
lvent Blue12j.

Orient Oil Blue BO (C, i, 5olve
nt Blue25).

Sudan Blue U (C,1,5olvent Bl
ue35).

Sumipuraatob/l/ -OA (C,1,8o1ve
nt B1ue36).

Zapon First Blue FLK (C, 1, 8o1ve
ntBlue55).

Eisenspiron Blue (C, 1,5olvent B
lue73).

Sumiplastogly-7G (C, 1,5olvent G
reen3).

-1-7 TOT I Jl/BRA'7 RI1-EB
B, (C,1,5olventB1ack3).

Nigroshinbe 7. (C,1,5olvent Bl
ack 7).

Victoria Blue (C, 1,8o1vent Blue
2).

Orient Oil Yeo-GIJ(C,1,8o 1
ventYellow2).

+'Ho77 T -Stoey L Low CGG(C,1
,SolventYellow15L Eisenspi CI F-Low GRH(C,1,5o
lventYel low 61).

Iketonii x o -GRextra (C, i, S
oventOrange 1)l Isense Hiron Orange GRH (C, 1, Solve
ntOrange 37).

Aizensbiron Ferry Red BH (C, I.

5o1vent Red 81).

Eisenspiron Pink BH (C, 1,5olvent
Red82).

Eisenspiro 717'ydo BEH (C, 1,5ol
vent Red83).

Orient Oil Violet≠730 (C, I.

5olvent Violet 13).

Eisenspiron Violet R) L (e, 1.5o
lventViolat 21 )+ One of the 4'6T4 charge control ii:i agents that is most useful in the present invention is nigrosine-based because of its positive charging properties. Nigrosine base itself has a blackish-purple color, but in the present invention, the amount used is so small that it hardly affects the color tone of the toner.

The average particle size of the charge tliil 1+Ill*'l is 3 μm
It is preferable that it is below. If the particle size becomes too large, it becomes difficult to uniformly disperse the particles into individual toner particles, and as a result, it becomes impossible to uniformly scatter positive charges on the toner surface, and the object of the present invention is not achieved.

In the color toner of the present invention, silicone oil is used in the method in which the developer is fixed with a hot roll.

Offset inhibitors such as low molecular weight olefins and various waxes may be used in an amount of 2 to 15% by weight. In applications where the developer is fixed with a pressure roll, a pressure fixing property imparting portion such as paraffin wax, various animal/vegetable waxes, fatty acid amides, etc. may be used in an amount of 5 to 30% by weight of the whole.

In the color toner of the present invention, positive charges are scattered in the distribution of negative charges on the toner particle surface 1m.

In the separation of positive charges, it is necessary to expose one portion of the 'ts load control' l111 to the toner surface. The charge control agent is usually a fine powder and is uniformly dispersed in the toner. Therefore, as a method of exposing the fine powder of the charge control agent on the toner surface, Toner! ! By using the scrap crushing method, it is possible to make one charge control agent come out in a certain 9m. The color toner of the present invention therefore has the following characteristics:
Polyester Resin 9 Various components such as a colorant and a positive charge control agent are mixed by three-roll, twin-screw extrusion, etc., and the resulting kneaded composition is cooled at room temperature, and then coarsely pulverized and then finely pulverized. , obtained by classification so that the average particle size is 5 to 25 μm. The particle size of this color toner particle is 1
Usually, it is preferable to have a radius of 5 to 25 μm.

In addition, to further improve the spreadability of this color toner, a fluidizing agent such as vapor phase silica may be added, if necessary, by means such as dry blending or sprinkling.

Actually, I collapse example The present invention will be described below with reference to Examples.

Example 1 Bisphenol type polyester 4m resin (AT R-2
010, manufactured by Kao Soap Co., Ltd.) 100 @Okibe, red azo lake pigment (II'ast-ed 2BE-1218,
C, I Pigment Red48. Manufactured by Sanyo Shikisha) 6
Weight parts - and Nigrosine base to Grosine base EX
, manufactured by Orient Kado Co., Ltd.] using a twin screw extruder PCM-30.
The mixture was heated and melted at 50°C. After cooling, the kneaded material is crushed into a coarse powder frame using a hammer mill, and then finely ground using an ultrasonic jet mill. The obtained fine powder was classified using a zigzag classifier to obtain a red toner having a particle size distribution of 5 to 25 μm. In order to understand the distribution of charge 1U control ablation in the obtained red toner, the particle cross section was observed using an electron microscope using a microtome, and it was confirmed that the nigrosine base was uniformly exposed on the surface. to this.

R-972 (vapor phase silica, manufactured by Japan Yerosil) and -A
j! , 0. - C (vapor phase process alumina, manufactured by Nippon Aerosil Co., Ltd.) was added in an amount of 0.1 wt 4 and textured on the back side of the toner using a Henschel mixer. For 10 parts by weight of this toner, 1 iron powder carrier (8'rV-25T, manufactured by Nippon Tetsuko Co., Ltd.)
00 parts by weight were mixed to obtain a developer. When this image enhancement image was copied using a commercially available PPC (DC-131, manufactured by Sanda Kogyo), the image (ff density 1.24 and background fog density 0.
A clear red copy with excellent resolution and no image blur of 0.001 or less was obtained. The blow-off rate of this developer was measured and found to be -24.3 .mu.c/g.

Comparative Example 11 A toner was obtained in exactly the same manner as in Example 1 except that nigrosine base j (X was removed) from the composition and proboscis. Copied using commercially available PPC-DC-1a 1 in the same manner as in Actual Example 1. A red copy was obtained in which the image was significantly smeared and fine lines were blurred, making it unsuitable for practical use.The blow-off friction zone weight of this developer was measured and was -31.4 .mu.c/g.

Example 2 Bisphenol type polyester +1 resin (AT R-2
010) 100 parts by weight, 6 parts by weight of blue phthalocyanine pigment (Cyanine Blue FG, manufactured by Dezumi Shiki Co., Ltd.) and 0.0 parts by weight of Nigrosine Base EX (average particle size 2.0 μFF+).
3 parts by weight were made into a toner in exactly the same manner as in Example 1.
Example 1: Obtaining a blue toner with a particle size distribution of ~20 μm
When copied using a commercially available PPCDO-131 in the same manner as above, the density of one image was 1.29 and the background fog density was 0.0.
A clear blue copy with excellent resolution and no image blurring of 01 or less was obtained. The blow-off friction zone* amount of this developer was measured and was -2.05 μc/g.

Comparative Example 2 A toner was obtained in exactly the same manner as in Example 1, except that Nigrosine Base EX was removed from the composition of Example 2. When copying was done using PCIJC-131 (also available on the market), a blue copy was obtained which was unsuitable for practical use, with significant image smearing and thin lines.When the blow-off triboelectric charge amount of this developer was measured, it was -26.1 μc/ It was g.

Effect of the invention In the color toner of the present invention, as described above.

Since the positive polarity control agent is uniformly distributed so that a portion of it is exposed on the surface, repulsion between the toners is suppressed without damaging the toner as a whole and the amount of silt.
Toner scattering and image blurring at the periphery of the image are suppressed. As a result, it becomes possible to obtain an image with excellent resolution.

that's all Applicant: Sanda Kogyo Co., Ltd. Agent: Patent Attorney Shusaku Yamamoto

Claims (1)

[Scope of Claims] 1. In a color toner mainly composed of a negatively charged polyester resin and a colorant, 0.05 to 0.7 parts by weight of positive charge per 100 parts by weight of the polyester resin; A color toner made by uniformly distributing a control agent so that a portion of it is exposed on the surface. -2. The color toner according to claim 1, in which the positive charge control agent is based on nigrosine. 3. The claim in which the positive charge control agent has an average particle size of 3 μm or less.