JPS63113558A - Toner for developing electrostatic charge image - Google Patents

Abstract

PURPOSE:To prevent generation of a hot offset by incorporating alcohol which is solid at an ordinary temp. into a toner. CONSTITUTION:The alcohol which is solid at the ordinary temp. is incorporated into the toner. Addition polymn. type resins such as a styrene resin and acrylic resin, condensation polymn. type resins such as polyamide resin and further epoxy resin, etc. are usable as the resin component of the toner. The alcohol is aliph. satd. alcohol which contains satd. hydrocarbon as its main chain and is in the solid state preferably at 60 deg.C. The mol.wt. thereof is 250-1,000 and such alcohol is adequately, for example, heptadecyl alcohol, melissyl alcohol, etc. The amt. of the alcohol to be used is specified to 0.5-10pts.wt. per 100pts. wt. resin component in the toner. Generation of the sticking of the toner to a fixing roll at a high temp. or 'hot offset' is thereby prevented.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention relates to an electrostatic image developing toner used for developing an electrostatic latent image formed in electrophotography, electrostatic recording, etc. It is something.

<Prior art> Electrophotography uses photoconductive materials such as selenium, zinc oxide, and organic photoconductors as photoconductors, and forms an electrical latent image by various means. Toner is applied to the image using a magnetic brush development method or the like to make it visible, and then this toner image is transferred to paper, a sheet, etc., and then fixed by heat, pressure, etc.

The heat-melting method, which is the most commonly used fixing method, can be roughly divided into two types: a non-contact type and a contact type. The contact type, especially the heated roll fixing method, has excellent thermal efficiency and is capable of high-speed fixing, so it has become the mainstream fixing method for high-speed copying machines, printers, etc. in recent years. There is.

However, this heated roll fixing method also had some drawbacks.

That is, there have been drawbacks such as unstable toner fixing properties and insufficient fixing due to the short time the toner is in contact with the fixing roll in high-speed copying machines, high-speed printers, etc. To solve this problem, increase the fixing temperature,
It is possible to take countermeasures on the copier itself, such as increasing the pressure on the fuser roll, but increasing the fusing temperature is not a good idea in terms of energy consumption, and increasing the pressure on the fuser roll may shorten the life of the fuser roll. It is extremely disadvantageous in terms of shortness and cost.

Therefore, various studies have been made to lower the temperature at which toner can be fixed.

<Problems to be Solved by the Invention> However, in the conventional method, it was possible to lower the softening point of the toner and lower the fixable temperature to some extent;
This is still insufficient and it has been difficult to completely prevent toner from adhering to the fixing roll at high temperatures, ie, the occurrence of so-called hot offset.

<Means to Solve the Problem> Therefore, the present inventors conducted intensive studies to solve the conventional problems, and as a result, they found that by incorporating a specific alcohol into the toner, the fixing temperature of the toner can be sufficiently raised. The inventors have discovered that the above-mentioned problems can be solved by reducing the amount of energy required, and have arrived at the present invention.

That is, the gist of the present invention resides in an electrostatic image developing toner comprising at least a resin and a colorant, which is characterized in that the toner contains an alcohol that is solid at room temperature.

The present invention will be explained in detail below.

As the resin component of the toner of the present invention, known resin components can be used.

That is, examples include addition polymerization type resins such as styrene resin, styrene-acrylic resin, styrene-butadiene resin, and acrylic resin, condensation polymerization type resins such as polyester resin and polyamide resin, and epoxy resins.

Among these resins, monomers for forming addition polymerization type resins include styrene, 0-methylstyrene, m-methylstyrene, p-methylstyrene, α-methylstyrene, p-ethylstyrene, S, tt- dimethylstyrene,
p-n-butylstyrene, p-tart-butylstyrene, p-n-hexylstyrene, p-n-octylstyrene, p-n-nonylstyrene, p-n-decylstyrene j p''-dodecylstyrene, p- Methoquinostyrene, p-phenylstyrene, p-chlorostyrene,
3. Styrenes in Kudichlorostyrene; ethylenically unsaturated monoolefins such as ethylene, chlorostyrene, styrene, and isobutylene; j Vinyl halides such as vinyl chloride, vinylidene chloride, vinyl bromide, and vinyl fluoride; 9
g Vinyl esters such as vinyl acetate, vinyl propionate, vinyl benzoate, vinyl butyrate; methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, propyl acrylate, n-octyl acrylate, acrylic acid Dodecyl, lauryl acrylate, monoethylhexyl acrylate, stearyl acrylate, p2-chloroethyl acrylate, phenyl acrylate, methyl α-chloroacrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate,
n-butyl methacrylate, isobutyl methacrylate, ゛8'°-n-octyl methacrylate, dodenyl methacrylate, lauryl methacrylate, methacrylic acid! -Esters of α-methylene aliphatic monocarboxes such as ethylhexyl, stearyl methacrylate, phenyl methacrylate, dimethylamine ethyl methacrylate, and diethylaminoethyl methacrylate; acrylic acids such as acrylonitrile, methacrylonitrile, and acrylamide; Methacrylic acid derivatives; vinyl ethers such as vinyl methyl ether, vinyl ethyl ether, vinyl isobutyl ether; vinyl methyl ketone, vinyl hexyl ketone,
Vinyl ketones such as methyl isopropenyl ketone; 1
N-vinyl compounds such as 1-vinylpyrrole, N-vinylcarbazole, N-vinylindole, and N-vinylpyrrolidone; monoolefinic monomers such as pinylnaphthalene; pukopadiene, butadiene, isoprene, chloroprene, pentadiene, hexadiene Examples include diolefin monomers such as. These monomers can be used alone or in combination of two or more.

In addition, the monomers forming the condensation polymerization type resin include ethylene glycol, triethylene glycol,
2-propylene glycol, /, 3-propylene glycol, /2 μm phytanediol, neopentyl glycol, /, Hiro-butenediol, /, ≠-bis(hydroxymethyl)cyclohexane, bisphenol A %
Hydrogenated bisphenol A1 Polyhydric alcohols such as polyoxyethylenated bisphenol A and polyoxypropylenated bisphenol A, polyhydric amines such as ethylenediamine, tetramethylenediamine, pentamethylenediamine, piperazine, hexamethylenediamine, and
maleic acid, fumaric acid, mesaconic acid, citraconic acid,
itaconic acid, curtaconic acid, phthalic acid, isophthalic acid,
Polyhydric carboxylic acids such as terephthalic acid, cyclohexanedicarboxylic acid, succinic acid, adipic acid, sepatic acid, malonic acid, or their acid anhydrides or esters with lower alcohols, and dimers of liluic acid can be exemplified. .

Further, as a charge control agent that may be used as necessary in the toner of the present invention, for example,
Fetschwarz HBN (Fet t El
ChWa r Z HBN y C-l-NO,2 Otsu/
jO), alcohol-soluble nigrosine (Nigros
in; C,■.

No, rot, t/s), Sudan Chief Schwarz B
B(5udan tiefschwarz B B,”
Norpento Black 3; q engineering, No, 26/30)
, Brilliant Spirit Schwarz T N (Br1
llantsprit =:schwarzTpT;
Zaponschwarz X;
Falberke, produced by Hoechst), Ceresschwarz (RIG), which has negative triboelectricity
rz(R)G; Falpen, Fapriken, Bahia), Chromogenschwarz E T OO (Chrom
oganschWarz ETOO,” C,I,
NO, / II A II j ), Azo Oil Black (R1 (AZo 011 Black (R)
5 National, manufactured by Aniline), Spin Black TR
Examples include dyes such as H (manufactured by Hodogaya Chemical Co., Ltd.), Bontron S3≠ (manufactured by Orient Chemical Co., Ltd.), and JJJR such as phthalocyanine blue.

Further, examples of the colorant used in the toner of the present invention include carbon black, nigrosin bengal, phthalocyanine blue, and mixtures thereof.

Toner components other than colorants may include additives such as low molecular weight olefin polymers and finely powdered silica to improve fixing properties and fluidity.

The present invention can also be applied to color toners by selecting color dyes and pigments instead of the colorants.

In the present invention, it is important to contain an alcohol that is solid at room temperature in the toner, and such alcohol is an aliphatic saturated alcohol that has a saturated hydrocarbon main chain and is solid at room temperature, preferably 10"C. The molecular weight of such alcohol is preferably -2 to O.
~/, 000, specifically heptadesol alcohol, stearyl alcohol, nonadenor alcohol,
Eicosyl alcohol, ceryl alcohol, mericyl alcohol, etc. are preferably used.

The amount of alcohol used above is 100% of the resin component in the toner.
The amount x parts is preferably 03 to 70 parts by weight. Note that if this amount range is used, the temperature at which the toner can be fixed will not be appropriate, which is not preferable, but the point is that the temperature at which the toner can be fixed will vary depending on the model of copier or printer. Just adjust it so that it is appropriate.

The toner can be produced by kneading the above-mentioned components in a machine, cooling, pulverizing, and classifying.

Further, the toner of the present invention can be applied not only as a two-component developer but also as a so-called one-component developer (magnetic toner) in which magnetite is kneaded, such as an encapsulated toner or a polymerized toner.

The average particle size of the toner of the present invention is preferably 20 μm to 20 μm.

Further, the carrier to be mixed with the toner of the present invention to form a developer is not particularly limited, but may be 10-200 μm.
Although iron powder having an average particle size of is preferable, there is no restriction on the particle size of the iron powder.

In this case, a so-called coated carrier coated with a fluororesin or the like can also be used for the purpose of improving durability during continuous use.

Ferrite and magnetite iron powders can still be used.

<Effects of the Invention> The toner of the present invention is a toner for developing electrostatic images in which the fixable temperature of the toner is sufficiently lowered.

Therefore, by using the electrostatic image developing toner of the present invention, it is possible to prevent the toner from adhering to the fixing roll at high temperatures, ie, from occurring so-called hot offset.

<Examples> Hereinafter, the present invention will be explained in more detail using Examples, but the present invention is not limited to the following Examples in any way unless it exceeds the gist thereof.

In addition, "parts" in the examples indicate "parts by weight."

<Example/> Styrenic resin (8 parts M-1,00 manufactured by Sanyo Chemical Co., Ltd.)
700 parts> Oil black BS (manufactured by Orielt Chemical Co., Ltd.) Part J carbon black (MA-/θO manufactured by Mitsubishi Chemical Co., Ltd.)
70 parts fatty acid incubation alcohol (molecular weight ≠, 2) and 5 parts are blended, kneaded, crushed, and classified to obtain an average particle size of // μm.
A black toner was obtained.

Using 5 parts of this toner and 100 fluororesin-coated carriers with an average particle diameter of about 700 μm, an unfixed copy sample in the form of a black band of width f cm was made using a black band-shaped document of width J' cm before entering the fixing roll. I turned off the copy machine and made it.

This sample with black band-like toner in the middle crrL is /4I! After passing it between a Teflon-coated fixing roll with a surface temperature of 0°C and a silicone rubber fixing roll, I rubbed the fixed black band with my finger.
It was well established.

If the toner is not fixed at this time, it will come off when you rub it with your fingers.

The low-temperature fixing performance of the toners of Examples 2 to 1IL and Comparative Example/ was evaluated in the same manner.

In other words, it can be said that the toner is preferable as it can be fixed at a low temperature. Furthermore, regarding the undesirable phenomenon of toner adhering to the surface of the fixing roll at high temperatures, so-called high-temperature offset, the surface of this Teflon fixing roll was set at 220° C., and the presence or absence of offset was investigated.

As a result, high temperature offset at 220°C did not occur. Therefore, the toner of Example// was a toner that could be practically used in the temperature range of ≠0 to 220°C.

<Example 2> A toner having an average particle size of 2 μm was obtained by blending, kneading, crushing, and classifying in the same manner as in Example, except that the fatty acid saturated alcohol (molecular weight≠25) was used in g parts.

Using this toner, a developer was prepared in the same manner as in Example/, and the low-temperature fixability and high-temperature offset were determined. The results were/33.
Part C satisfied the low-temperature fixability, and no high-temperature offset occurred at 220'C.

<Example 3> A toner was produced in the same manner as in Example except that the fatty acid saturated alcohol (molecular weight 7θO) was changed to 5 parts. After preparing a developer, low-temperature fixability and occurrence of high-temperature offset were examined. As a result, low-temperature fixability was satisfied at /≠θ°C, and high-temperature offset did not occur even at 220°C.

<Example≠> A toner was prepared in the same manner as in Example except that 7 parts of fatty acid saturated alcohol (molecular weight 700) was used, a developer was prepared, and the performance was evaluated, and the low-temperature fixability was satisfied at 760°C. However, high temperature offset did not occur at 220 °C.

Comparative example/〉 Example/ except that fatty acid saturated alcohol was not used
A toner was produced in the same manner as above, a developer was prepared, and its performance was evaluated.The low-temperature fixability was satisfied at 170°C, and high-temperature offset did not occur at 220°C.

Claims (3)

[Claims] (1) An electrostatic image developing toner comprising at least a resin and a colorant, characterized in that the toner contains alcohol that is solid at room temperature. (2) The toner for developing an electrostatic image according to claim 1, wherein the alcohol has a molecular weight of 250 to 1,000. (3) 0.5 to 0.5 to 100 parts by weight of the alcohol per 100 parts by weight of resin
The toner for developing an electrostatic image according to claim 1, characterized in that the toner contains 10 parts by weight.