JPS587647A - Developing powder for fixing with high frequency wave heating - Google Patents

Abstract

PURPOSE:To obtain a toner capable of exhibiting good development performance even in high temperatures and high humidities in fixing with high frequency wave heating, by adding a polymer having a specified acid value and hydroxyl group value, and containing ester linkages in the main chain to a developing powder. CONSTITUTION:A polymer, such as a polyester resin having ester linkages in the main chain and both of an acid value and a hydroxyl group value of >=5 is synthesized. A developing powder for use in fixing with high-frequency heating is prepared by adding a prescribed magnetic powder to this polymer. This toner has sufficient adhesion between the toner particles and an image preserving material and that of particles with one another, and superior fixing performance is obtained even when the temperature of the image-preserving material is comparatively low.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a powder (hereinafter referred to as toner) suitable for an island frequency heating fixing method in electrophotography, electrostatic printing, magnetic recording, etc.

Electric a11! Alternatively, toner for magnetic development is conventionally made by t-melting kneading with a binder resin such as polystyrene, a coloring agent such as carbon black, and optionally additives, followed by pulverization after death. ,5~20μ
It is generally used in the form of a fine powder.

As a method for fixing the toner 1 on the 1k11II support, a thermal fixing method and an electric fixing method are generally used. Thermal fixing methods include contact heating methods such as hot roll fixing (rC) and radiation heating methods; however, #care tends to cause problems such as toner offset to the roller, and the latter tends to cause problems such as scorching and burning. It is easy to cause Furthermore, both have the disadvantage that they have a limited shelf life after the power is turned on.

In recent years, development of pressure fixing methods using pressure rollers has been active. The pressure fixing method has advantages such as instant start and energy saving, but the fixing performance is not perfect.
It also has disadvantages such as wrinkles or 1 yukare easily occurring in the adjustment, and a significant amount of originality in the # (#) after fixing.

On the other hand, the high frequency heating fixing method is Innostand Start,
It has many excellent advantages such as no problems such as burning or burning, and no offset phenomenon.
have.

It is said that when using the MJN wave heating heating fixing method, it is sufficient to use a binder resin with a dielectric constant of 10,000,000. ! Although WA does not occur for a long time in the normal humidity environment F, there is a drawback that the image density tends to decrease when the surface of the captive area is still damp. Furthermore, even in the case of a method in which multi-wrinkled carbon black is cooled in a toner, the compensability is significantly reduced when the environment becomes 111] too hot.

An object of the present invention is to provide a gutter suitable for -Ni for commercial wave heating, which exhibits excellent behavior even at high temperatures and humidity. Another object is to provide a toner that has undergone high frequency heat fixing and is rapidly fixed. Yet another object is to provide a fast, energy-saving, constant flow toner. Still another object is to provide a toner suitable for use in a frequency-heated mud layer, which has excellent physical and chemical properties such as tribocharging and non-cohesive properties.

The reason why the soap is organic is that it is a developer powder for high-frequency heat fixing that contains all monomolecular compounds containing ester bonds in the main chain and has an acid value and a water vapor value of 5 or more.31 Used in the present invention A polymer compound containing an ester bond in the main chain with both an acid value and a hydroxyl value of 5 or more is a polyester resin synthesized from a polybasic acid or its anhydride and a t-polyhydric alcohol. Direct esterification reaction and transesterification reaction between substances and polyhydric alcohols.

It is synthesized by the collar decomposition reaction and kaifukudenai.

As a multi-proximal anhydride, Q, anhydrophthal #,
Alephthalic acid, adipic acid, hexahydrophthalic anhydride, sebacic acid, m-aqueous maleic/malic anhydride, trimellitic anhydride, het-acid anhydride.

Methylcyclohexene, tricarboxylic acid #H1l: water.

Tetrachlorophthalic anhydride, hymic anhydride.

Examples include pyromellitic anhydride, citraconic acid, endomethylene ketorahydrophthalic anhydride, trimellidic anhydride, and methylnadic acid.

Examples of polyhydric alcohols include ethylene glycol, bisphenol dihydroxyprobyl alcohol, 1,3-butylene glycol, trimethylolethane, diethyle/Daricol, trishydroxymethylaminomethane, propylene glycol, glycerin, and 1,6-hexanediol. .

Trimethylolpropane, diglobylene glycol, pentaerythritol, neopentyl glycol, 11-enalene glycol, hydrogenated bisphenol A, dipentaerythritol, hisphenol A, 1.4-butylene glycol, 2.3-butylene dalicol, ■ , 5bentanediol.

2.2. -4. Trimethylpentanediolu 1,
Examples include 3° pentaerythritol diallyl ether, glycerin, trimethylene dalycol, 2-ethyl-1,3-hexanediol, phenylglycidyl ether, allylglycidyl ether, and the like.

child? 1 polybasic acids and polyhydric alcohols, respectively.
Among polyester resins synthesized using 11 or more, those whose acid value and hydroxyl value are both VC5 or less are preferable for the purpose of the present invention, and among them, those whose hydroxyl value is 10 or more are particularly preferable. The above polyester resin acts as a binder resin in the toner, and the lid containing it is 1O1 of the total binder resin.
Contains not less than 1% by weight (preferably 20% by weight)
It's good to be able to do it.

In addition to the polyester resin described above, other binder resins may be used in the powder of the present invention. In this case, all the known materials are feces.

For example, polystyrene, polystyrene.

Poly-α-methylstyrene, styrene-chlorostyrene coelectrolyte, styrene-propylene copolymer, styrene-
Butadiene copolymer, stitched and non-vinyl chloride copolymer. Styrene-vinyl acetate copolymer, styrene-maleic acid copolymer.

Methyl non-acrylic ester copolymer (styrene-
Methyl acrylate copolymer, styrene-ethyl acrylate copolymer, styrene-butyl acrylate copolymer, styrene-acrylic (styrene-methyl methacrylate copolymer, styrene/-ethyl methacrylate gill 11 combination, fin/ - bunal methacrylate copolymer, styrene-noenyl methacrylate copolymer, etc.).

Styrene thread resins (styrene/or homopolymers or copolymers containing styrene substitutes) such as styrene/-α-chloroacrylic acid menal copolymer and styrene-acrylonitrile-acrylic acid ester coelectropolymer.

Vinyl chloride resin, ethylene-vinyl acetate copolymer, rosin ta-maleic acid resin, phenyl resin, epoxy resin, low-molecular polyethylene, low-molecular t-polypropylene, ionomer resin, polyurethane resin, silicone resin,
Ketone resin.

Examples include EthiF//-enal acrylate co-togopolymer, xylene resin, polyvinyl butyfur resin, and the like.

In the toner of the present invention, for purposes such as coloring and charge control,
carbon black, iron black, dalaphite, nigrosine,
Metal complexes 9 ultramarine blue, phthalocyanine blue, Hansa yellow, benzine yellow, nacridone, each i lake al: +c' italsilicity, barium titanate, etc.!
ii@It doesn't matter if you add an electric substance or the like.

4- In order to use the toner of the invention as a tidy toner,
The material containing magnetic powder t''L is good, and such magnetic powder may be any material that exhibits magnetism or can be magnetized, such as metals such as iron, manganese, nickel, cobalt, and chromium, magnetite, hematite, Various ferrites, ma/
There are gun alloys and other ferromagnetic alloys, and these have an average particle size of approximately α05 to 5μ (more preferably 0.1 to 2μ).
It can be used as a fine powder. The amount of magnetic fine particles contained in the tube is 15 to 70 weight (more preferably 25 to 50 weight wLI%) of the weight of the toner sheet.

Toner containing such magnetic powder has magnetic latent 11
It is also suitably used for high-frequency heating fixing of 1I.

Figure 1 shows an example of a frequency υt+s sublayer device using microwaves, in which the fixing process performed overnight with toner 2, S distribution member 1, special pipe 3, and the highest electric field strength. Pass the belt 5 through the 4 slits made in the # wall of the large central part.
I went to a restaurant, absorbed microwave energy, and made a picture 1.
What's the point of letting it become established? It should be noted that a large number of the illustrated special wave operators 3 are installed side by side around the corner so as to supply microwave energy to the recording unit several times. 6 indicates a belt-driving roller.

In addition, a visiting physical electric current 7 is placed in close proximity to the image surface of the recording member 1 in the waveguide 3, and is caused to absorb microwave energy and generate heat, thereby distributing the recording member 1 and the toner 2.
If the I/C@ is configured to dissipate heat from θJ, the heating efficiency can be improved, that is, the sieve frequency power supply capacity 1 can be made smaller. The dielectric material 7 is preferably made of a material with a low dielectric constant such as ceramics, glass, or Teflon, and which has good heat insulation properties.

In the IIl+frequency heat constant method, it is desirable that the toner particles be designed to selectively absorb radio frequency energy and be heated.

The polynisder resin used in the present invention with an oxidation value and a hydroxyl value in the range of May is susceptible to temperature rise due to intermolecular friction caused by the vibration N rotation of dipoles formed when placed in a high frequency electric field. It is. In addition, in order to save energy in high-frequency heat fixing, even if the temperature of the fixing member at the time of application is relatively low compared to conventional methods, polyester resin with both acid value and hydroxyl value of 5 or more is used in the toner. Contains? By tightening the toner particles, sufficient adhesion between the toner particles, the compensation carrier, and the toner particles can be obtained, and good fixing properties can be obtained.

The latent image can be developed using the toner of the present invention by a magnetic brush method, a cascade development method, or a powder seal method.

Method using conductive magnetic toner described in U.S. Pat. No. 3,909,258, JP-A-54-42
141, 55-18656, etc., or a method using sheet resistance magnetic toner, etc., may be used.

Hereinafter, the present invention will be explained in detail with reference to Examples.

[Example 1] 100th part of a polyester resin with an acid value of 12 and a hydroxyl group @ti19 synthesized from terephthalic acid and ethylene glycol, and 5 parts by weight of carbon blank.

Magnetic powder (ferrite powder with an average particle size of 0.2μ) 70 electromagnetic parts, metal-containing dye (trade name, Zahoji Fast Black B, B
(manufactured by ASF') was ground and mixed in a ball mill.
Melt and knead in a roll/L, K bath. After cooling, it is coarsely ground using a hammer mill.

Then, it is finely pulverized using a supersonic jet pulverizer.

The obtained powder was classified using a wind classifier, and the size of the powder was approximately 5 to 35μ.
The particles were collected and used as toner. Add and mix 05 parts of hydrophobic colloidal silica to 100 parts of this toner,
It was used as a developer.

Using this current fw agent, a plain paper electronic copying machine (product name N)
P400-RE, manufactured by Canon) to obtain an unfixed image. The settlement is 2450 ■ mouths.

This was carried out using a magnetron with an output of IKW.

A good fixed image was obtained in 5 seconds. The images were clear and clear even at high temperatures and humidity (35°C and 85°RH) [Comparative Example 1] The same procedure as in Example 1 was conducted except that polystyrene 100% was used instead of polyester.
The fixability of the h image was poor.

[Example 2] Polyester resin 9 synthesized from bisphenol A, nomaric acid, and maleic acid, with 1 tlk, 14 tones, 4 tones, and 18 base values.
5 parts i, styrene-methyl methane rylate hem combination (monomer weight ratio 8:2) 5 parts iI, 80 parts by weight i powder (triiron tetroxide with an average particle size of 0.4μ), metal-containing dye Example 1 and l except that the toner was made from 2 parts by weight.
When I went to the WI building, I found salmon and JAZ images.
The electrical layer properties were also good.

[Example 3] Propylene glycol, isophthalic acid, anhydrous virome IJ
) Acid value synthesized from acid 11. 2 bundles of hydroxyl metal-containing dye i
When the toner was printed in the same manner as in Example 1 except that the toner was prepared from the t portion, clear me was obtained and the fixability was also good.

〔implementation? 1141 Polyester resin with acid value 1B and hydroxyl group fi21 synthesized from maleic anhydride and diethylene glycol 95 folds, 5 parts by weight of styrene-dimethyl maleate copolymer (7-mer weight ratio 9:1), carbon black 77 @ amount A bamboo-free toner was prepared in the same manner as in Example 1 from 2 parts by weight of the metal-containing dye, 12 parts by weight of this toner, 88 parts by weight of carrier iron powder (EFV250/4001=1 manufactured by Hontetsuko Co., Ltd.), and t. - Mixed to form 7.4 wound agent.

Using this developer, a plain paper electrophotographic copying machine (product name, N
Developed with P-5000 manufactured by Canon) and undetermined smm
I got it. This image was applied for 7 seconds using a 2450 MHz output IKW magnetron to obtain a good fixed image.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an example of a high frequency heat fixing device. 2... Toner. 3... Waveguide. Applicant Canon Co., Ltd. Agent: Miss Marushima-1 to

Claims (1)

[Claims] A present powder for high frequency heat fixing, characterized in that it contains a polymer compound having an ester bond in its main chain, an acid value of 5 or more, and a hydroxyl value of 5 or more.