JPS62105156A - Color toner for developing electrostatic charge image - Google Patents

Abstract

PURPOSE:To obtain a desired sharp color copy image by using a complex of a salicylic acid deriv. and titanium as an electric charge controlling agent. CONSTITUTION:A color toner contains a binder resin and coloring agent as essential components in addition to the charge controlling agent. The complex of the salicylic acid or salicylic acid deriv. and titanium is incorporated as the charge controlling agent into the binder resin at 0.5-10pts.wt. by 100pts.wt. said resin. The complex of the salicylic acid or salicylic acid deriv. and titanium which is the charge controlling agent is colorless and can provide a substantial negative electrostatic charge characteristic to the toner. The color toner of a desired color is thus obtd. simply by changing the color of the coloring agent in the stage of preparing the color toners of different colors.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a color toner for developing electrostatic latent images in electrophotography, electrostatic recording, and the like.

(Prior Art) Generally, a toner for developing an electrostatic latent image is obtained by dispersing a dye or pigment as a coloring agent in a binder resin to obtain a toner of a desired color. Furthermore, dyes, pigments, and the like are added as charge control agents to impart preferable charging characteristics to the toner. However, since the charge control agent is generally colored, the color of the charge control agent used must be similar to the color of the color toner in view of the saturation of the color toner. However, since the types of charge control agents that can be used in color toners are limited, it is difficult to freely obtain color toners of desired colors.

As a negative charge control agent, a metal complex with salicylic acid or alkyl salicylic acid using chromium, nickel, cobalt, or copper has been proposed, as described in Japanese Patent Publication No. 55-42752. Experiments have shown that although these charge control agents can impart sufficient negative charging characteristics to toner, they are slightly colored yellow-green, and when used in color toners, the color becomes muddy and the desired color cannot be obtained. It was not enough to obtain toner.

Therefore, there is a need for a charge control agent that is colorless, white, or light-colored to the extent that it can be considered substantially colorless.

(Problems to be Solved by the Invention) The object of the present invention is to overcome the above-mentioned drawbacks and provide a desired color,
Another object of the present invention is to provide various color toners having sufficiently negative charging characteristics.

(Means for Solving the Problems) The color toner of the present invention is a color toner for developing an electrostatic image characterized by containing a complex of a salicylic acid derivative with titanium. A color toner having sufficient charging characteristics is provided.

The complex of salicylic acid or a salicylic acid derivative with titanium, which is the charge control agent of the present invention, is colorless and can impart sufficient negative charging characteristics to the toner. Therefore, the use of the charge control agent of the present invention does not affect the original color of colorants such as dyes and pigments. Therefore, when producing color toners of different colors, the desired color toner can be changed simply by changing the color of the colorant.

The color toner of the present invention contains a binder resin and a colorant as essential components in addition to the charge control agent.

The charge control agent, binder resin, and colorant will be described below.

0 parts by weight of salicylic acid or a complex of a salicylic acid derivative with titanium as a charge control agent was added to 100 parts by weight of the binder resin.
．． It is preferable to contain 5 to 10 parts by weight.

Examples of the binder resin used in the present invention include polystyrene, chloropolystyrene, poly-α-methylstyrene, styrene-chlorostyrene copolymer, styrene-propylene copolymer, styrene-vinyl chloride copolymer, and styrene-malein. Acid copolymer, styrene-acrylic acid ester copolymer, (styrene-methyl acrylate copolymer, styrene-ethyl acrylate copolymer, styrene-butyl acrylate copolymer, styrene-octyl acrylate copolymer) , styrene-phenyl acrylate copolymer, etc.), styrene-methacrylate ester copolymer (styrene-methyl methacrylate copolymer, styrene-ethyl methacrylate copolymer, styrene-butyl methacrylate copolymer, styrene- phenyl methacrylate copolymer, etc.)
, styrene resins such as styrene-α-methyl chloroacrylate copolymer, styrene-acrylonitrile-acrylic acid ester copolymer (styrene or a homopolymer or copolymer containing a styrene substitute), vinyl chloride resin, styrene -Vinyl acetate copolymer, rosin-modified maleic acid resin,
There are phenyl resins, epoxy resins, polyester resins, low molecular weight polypropylene, ionomer resins, polyurethane resins, silicone resins, ketone resins, ethylene-ethyl acrylate copolymers, xylene resins, polyvinyl butyral resins, etc., but the above resins are used alone. It is not only possible to use two or more types in combination.

Furthermore, examples of the coloring agent used in the present invention include the following pigments and dyes.

Black colorants carbon black, acetylene black, lamp black, aniline black.

Yellow colorants: yellow lead, zinc yellow, cadmium yellow, yellow iron oxide, mineral fast yellow, nickel titanium yellow, navels yellow, naphthol yellow G1 Hansa Yellow G1 Hansa Yellow 10G3 Henjin Yellow G1
Benzidine Yellow GR1 Quinoline Yellow Lake,
Permanent yellow NCG, tartrazine lake.

Orange colorant red yellow lead, molybdenum orange, permanent orange GTR, pyrazolone orange, palkan orange, indanthrene brilliant orange RK, benzidine orange G, indanthrene brilliant orange GK.

Red colorant red color, cadmium red, red lead, mercury cadmium sulfide, permanent red 4R, resol red, viraduron resod, odocamacium salt, lake red D5, brilliant carmine 6B, eosin lake, rhodamine lake B, alizarin lake, brilliant Carmine 3B purple colorants Manganese Purple, Fast Violet B, Methyl Violet Lake.

Blue colorants: navy blue, cobalt blue, alkali blue lake, Victoria blue lake, phthalocyanine blue, metal-free phthalocyanine blue, fast sky blue, indane screen blue-BC.

Green colorant Chrome Clean, Chromium Oxide, Pigment Green B1
Malachite Green Lake, Final Yellow Green.

white colorant Zinc white, titanium oxide, antimony white, zinc sulfide.

Various dyes such as nigrosine, methylene blue, rose bengal, quinoline yellow, ultramarine blue, etc.

In addition to these, offset inhibitors such as polyolefins may also be added as appropriate within a range that does not affect the color of the color toner.

The invention is illustrated by the following examples.

(Example) Example 1 Styrene-acrylic resin (XPA-525: manufactured by Mitsui Toatsu Chemical Co., Ltd.) 100 parts by weight Red colorant (Fast Red 2BE: manufactured by Yamama Shiki Co., Ltd.)
5 parts by weight titanium complex of salicylic acid derivative (Bontron E
-84: manufactured by Orient Kagaku Co., Ltd.) 2 parts by weight of low molecular weight polypropylene (Viscol 550P: manufactured by Kochu Kasei Co., Ltd.) 2 parts by weight The above materials were mixed and melt-kneaded in a twin-screw extruder, then cooled and then processed in a feather mill. 2
Coarsely grind to a fineness of fl or less. Thereafter, the powder was finely pulverized using a jet mill, and particles of 5 μm or less were removed using an Alpine classifier to obtain a classified product with an average particle size of 11.5 μm.

Furthermore, hydrophobic silica fine particles (R-972
A red toner was obtained by adding 3% of Nippon Aeroseal (manufactured by Nippon Aeroseal Co., Ltd.) to improve fluidity. 25g of red toner thus obtained
A developer was prepared by mixing 475 g of ferrite carrier (F141-1530: manufactured by Nippon Tetsuko Co., Ltd.), and DC-11I
C (manufactured by Sanda Kogyo Co., Ltd.) was used for copying, and a bright red copy image was obtained.

Comparative Example 1 A red toner developer was prepared in the same manner as in Example 1, using a chromium complex (Bontron E-81: manufactured by Orient Chemical Co., Ltd.) instead of the complex of salicylic acid derivative with titanium used in Example 1. did. When the image was copied using a DC-11IC copying machine, the resulting image was dull red.

Example 2 100 parts by weight of styrene-acrylic resin (Prioride ACL, manufactured by Gusodoyer Co., Ltd.) 5 parts by weight of blue colorant (Suren Blue, manufactured by Yamama Shiki Co., Ltd.) Salicylic acid SA 6 titanium complexes (Bontron E-8)
4: manufactured by Orient Kagaku Co., Ltd.) 3 parts by weight of low molecular weight 'IF polypropylene (Viscol 550P: manufactured by Kochu Kasei Co., Ltd.) 3 parts by weight of the above materials in Example 1
A blue toner developer was prepared in the same manner as above. When the image was copied using a DC-111C copying machine, a bright blue copy image was obtained.

Comparative Example 2 A blue toner developer was prepared in the same manner as in Example 1 except that a chromium complex (Bontron E-81) was used in place of the titanium complex of the salicylic acid derivative used in Example 2. Then, I copied it using a DC-111C copying machine (
It was a clear blue copy image.

Example 3 Styrene-acrylic resin (XPA-525: manufactured by Mitsui Toatsu Chemical Co., Ltd.) 100 parts by weight Green colorant (phthalocyanine green: manufactured by Yamama Shiki Co., Ltd.) 6
Titanium complex of salicylic acid derivative (Bontron E-
847 Orient Chemical Co., Ltd.) 2 parts by weight low molecular weight polyethylene wax (Sunwax 161P
(manufactured by Kochu Kasei Co., Ltd.) 2 parts by weight A green toner developer was prepared using the above material in the same manner as in Example 1. And D
When it was copied using a C-111C copying machine, a bright blue copy image was obtained.

Comparative Example 3 A green toner developer was prepared in the same manner as in Example 1 except that a chromium complex (Bontron E-81) was used in place of the titanium complex of the salicylic acid derivative used in Example 3. When the image was copied using a DC-111C copying machine, the resulting image was a dull blue color.

(Effects) As described above, by using a complex of salicylic acid derivative with titanium as a charge control agent, desired clear color copied images can be obtained, and furthermore, a wide variety of color toners with sufficiently negative charging characteristics can be produced. can be provided.

Claims (1)

[Claims] A color toner for developing electrostatic images characterized by containing a complex of a salicylic acid derivative with titanium.