JPS58215659A - Toner for developing electrostatic latent image - Google Patents

Abstract

PURPOSE:To obtain a titled toner which has a wide practicable temp. range for fixation and has excellent flow characteristic and shelf life by compounding a binder resin and two kinds of polyalkylene differing in softening point. CONSTITUTION:(A) A binder resin (e.g.; polystyrene) which contains a high mol.wt. compondnt and a low mol.wt. component and of which the ratio Mw/ Mn of a weight averagle mol. wt. Mw with respect to the number average mol.wt. Mn thereof is >=3.5 is mixed with (B) 0.1-20wt% a mixture mixed with (a) polyalkylene (e.g.; PE) of 80-150 deg.C softening point and (b) polyalkylene of 120-180 deg.C softening point which is higher than the softening point of the component (a) and is 10-60 deg.C difference in the softening point between the component (a) and the component (b) at 1:9-9:1 weight ratio, (C) 1-20pts.wt. a coloring agent (e.g.; carbon black) based on 100pts.wt. the component A and, if necessary, (D) 20-70pts.wt. magnetic powder (e.g.; Heusler alloy) having 0.1- 1mum average grain size and after the mixture is melted and kneaded to grind to 5-50mu grain size.

Description

[Detailed description of the invention]

The present invention relates to a toner for developing electrostatic images formed in electrophotography, electrostatic printing, electrostatic recording, and the like. In the process of developing an electrostatic image, charged fine particles are attracted by electrostatic attraction and attached to the surface of an electrostatic image support.
This is the process of visualizing the electrostatic charge image. Specific methods (3) for carrying out such a development process include a wet development method using a liquid developer in which pigments or dyes are finely dispersed in an insulating organic coating, and a natural or synthetic method. Dry developing methods such as the cascade method, bristle brush method, magnetic brush method, impression method, and powder cloud method that use a powder developer consisting of a toner containing a coloring agent such as carbon black dispersed in a resin binder; There is. The image visualized in the developing step may be fixed on the support as it is, but usually it is transferred to another support such as transfer paper and then fixed. In this way, toner is not only subjected to the development process, but also to the subsequent processes, that is, the transfer process and the fixing process. However, it is required to have good transfer and fixing properties. Among these, the conditions related to fixing properties are the most severe, and many studies and results have been published in the past on improving the fixing properties of this toner. The fixation of the toner image formed in the developing process or the image to which it is transferred is generally advantageously carried out by a heat fixing method (% formula %) (27). and a contact heating fixing method such as heat roller fixing.The contact heating fixing method is superior in that it has high thermal efficiency, and is particularly capable of high-speed fixing and is suitable for fixing in high-speed copying machines. Since a relatively low-temperature heat source can be used, this method requires less power consumption, making it possible to downsize the copying machine and save energy.Furthermore, if paper accumulates in the fuser, Although the contact heat fixing method is preferable from various points of view as described above, it has a serious problem of the occurrence of an offset phenomenon. This is a phenomenon in which part of the toner that makes up the image is transferred to the surface of the heat roller during fixing, and this is transferred again to the transfer paper that is sent next, staining the image. To prevent this offset phenomenon, In the past, various proposals have been made and some have been put into practical use.
5) The toner is fixed while being applied to a cloth, and the other toner is one in which the toner itself has anti-offset properties. The latter method is superior in that the structure of the fixing device is simple because a silicone oil application mechanism and the like are not required, and maintenance such as replenishment of silicone oil is not required. The offset phenomenon occurs when the temperature of the heat roller increases, and therefore, the higher the minimum temperature at which the offset phenomenon occurs (hereinafter referred to as "offset occurrence temperature"), the better the non-offset properties of the toner. However, in order for the toner to be fixed, the trap needs to be heated to a temperature above its softening point, so in an actual heat roller fuser, the temperature of the heat roller is lower than the temperature of the toner. The temperature is set to a specific temperature within the fixable temperature range, which is higher than the softening point of and lower than the offset generation temperature. However, in reality, it is not possible to maintain the temperature of the heat roller at a completely uniform preset temperature, and there are other temperature considerations that must be taken into account. However, in the contact heat fixing method, in addition to the above-mentioned offset development, in addition to the above-mentioned offset development, the transfer paper etc. is There is a problem that a so-called winding phenomenon occurs, in which the heat roller is glued and wrapped around the roller.This winding phenomenon occurs especially when the temperature of the heat roller is too low.The highest temperature at which this winding phenomenon occurs ( (hereinafter referred to as the "winding generation temperature") is considerably higher than the softening point of the toner or binder resin, and it is not rare that it is higher than the offset generation temperature.Therefore, in toner, the offset generation temperature is higher than the winding generation temperature. It is necessary, and the difference is large,
That is, it is desirable that the practical fixing temperature range is wide, with the lower limit being the winding temperature and the upper limit being the offset occurrence temperature, and that its height does not impair the advantages of the contact heat fixing method. As a means of imparting properties to the toner itself that suppress the occurrence of the offset phenomenon and the wrapping phenomenon described above, it is effective to incorporate an anti-offset agent (7) selected from various release agents into the toner. It is known that polyalkylene is used as an anti-offset agent. However, simply incorporating a certain type of polyalkylene into the toner has the following undesirable tendency. That is, when the polyalkylene has a high softening point, the temperature at which wrapping occurs becomes high, and the toner adheres and accumulates on the roller constituting the fixing device. Furthermore, if the polyalkylene has a low softening point, the fluidity of the toner will decrease, and the storage stability will also decrease.
This makes it difficult to form a good visible image. The present invention has been made based on the above circumstances, and has a high offset generation temperature but a low winding generation temperature, and therefore has a wide practical fixing temperature range (and has excellent fluidity and storage stability). An object of the present invention is to provide a toner for developing an electrostatic image that can always perform good development and fixing.The toner of the present invention is characterized by a binder M resin, a first polyalkylene, and and a second polyalkylene having a higher softening point than the first polyalkylene.The present invention will be described in detail below.The present invention basically uses a resin mainly composed of a binder resin. In a toner for developing an electrostatic image formed by containing a colorant in a powder or granule, at least two types of polyalkylene, namely, a first polyalkylene and a second polyalkylene are used as components of the resin of the resin powder. Here, the second polyalkylene has a higher softening point than the first polyalkylene, so the first polyalkylene is a low softening point polyalkylene, and the second polyalkylene is a high softening point polyalkylene. Softening point polyalkylene.First
The polyalkylene (hereinafter referred to as "L-PAJ") is 80
The second polyalkylene (hereinafter referred to as [H-P AJ) must have a softening point in the range of 120 to 150°C.
It is preferable to have a softening point in the range of 80°C, and further have a softening point in the range of 80°C.
-The difference in softening point (9) between PA and L-PA is 5°C or more, preferably 10°C or more and 50°C
The following is desirable. In addition, L-PA and H-F
The softening point for A is JISK 2531-1960
This is the softening point when measured by the ring and ball method specified in . In addition, l, -PA and ) (-PA may be contained in a weight ratio of 1:9 to 9:1, and the ratio of both to the total toner of maxim 1 is 0.1 to 20% by weight, preferably 1-1
It is assumed to be 0% by weight. The type of L-PA or H-PA is not subject to any particular restrictions (L-PA and H-PA may be the same type of polyalkylene or different polyalkylenes. Specific examples of polyalkylene as L-PA or H-PA include polyethylene, polypropylene, polybutylene, and others.In addition to polyalkylene having only one type of alkylene as a monomer component, , an alkylene copolymer containing multiple types of alkylene as monomer components, or a polyalkylene containing alkylene and something other than alkylene as monomer components (10), L-P A or) 1. -PA
It can also be used as Here, alkylene as a basis weight component includes, for example, ethylene, propylene, butene-1, pentene-1, hexene-1, heptene-1, octene-1, nonene-1, decene-1, and unsaturated bonds. Isomers having different positions, as well as branched chains consisting of alkyl groups, such as 3-methyl-1-butene, 3-methyl-2-pentene, 3-propyl-5-methyl-2-hexene, etc. Includes all other alkylenes. Examples of monomers other than alkylene that form a copolymer with alkylene include vinyl ethers such as vinyl methyl ether, vinyl-n-butyl ether, and vinyl phenyl ether, such as vinyl acetate and vinyl butyrate. vinyl esters such as vinyl fluoride, vinylidene fluoride, tetrafluoroethylene, vinyl chloride, vinylidene chloride, and haloolefins such as tetrachloroethylene, such as methyl acrylic (]1
) rate, ethyl acrylate, n-butyl acrylate, methyl methacrylate, ethyl methacrylate,
n-butyl methacrylate, stearyl methacrylate, hedimethylaminoethyl methacrylate,

[-Acrylic acid esters or methacrylic acid esters such as butylaminoethyl methacrylate, such as acrylonitrile, acrylic acid derivatives such as N,N-dimethylacrylamide, such as acrylic acid, methacrylic acid, maleic acid, fumaric acid, itacon Various organic acids such as acids, diethyl fumarate, β-pinene, etc. can be mentioned. Therefore, in the present invention, the above-mentioned 1. -PA or H-P
The alkylene copolymer used as A is an alkylene copolymer consisting only of alkylene containing at least 2s or more of alkylene as a monomer component, such as ethylene-propylene copolymer, ethylene-butene copolymer, Ethylene-pentene copolymer, glopylene-butene copolymer, propylene-pentene copolymer, ethylene-3-methyl-1-butene copolymer, ethylene-propylene-butene copolymer, etc., or at least the above alkylene 1 and at least one of the monomers other than alkylene as described above as monomer components, such as ethylene-vinyl acetate copolymer, ethylene-vinyl methyl ether copolymer,
Ethylene-vinyl chloride copolymer, ethylene-methyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethylene-acrylic acid copolymer, globylene-vinyl acetate copolymer, glohylene-vinylethyl ether copolymer Copolymer, propylene-ethyl acrylate copolymer, propylene-methacrylic acid copolymer, butene-vinyl methyl ether copolymer, butene-methyl methacrylate copolymer, pentene-vinyl acetate copolymer, hexene-vinyl butyrate copolymers, ethylene-propylene-vinyl acetate copolymers, ethylene-vinyl acetate-vinyl methyl ether copolymers, and the like. (13) As the binder resin of the toner of the present invention, any of the resins conventionally used for this purpose can be used. Ratio Mw of weight average molecular weight Mw
A resin having a value of /Mn of 3.5 or more is preferable because it has good fixing properties and itself has non-offset properties. Specifically, polymers or copolymers of styrenic monomers (i.e., polymers or copolymers of one or more styrene monomers, styrene monomers and other vinyl It is preferable to use a copolymer with the styrene monomer or a polyester resin as the binder resin from the viewpoint of various properties and production.Specific examples of the styrene monomer include styrene, 0- Methylstyrene, m-methylstyrene, p-methylstyrene, α-゛methylstyrene, p-ethylstyrene, 2,4-dimethylstyrene, p-n-butylstyrene, p-tert-butylstyrene, p-”- xylstyrene, p-n-octylstyrene, p-n-nonylstyrene, (14) p-n-decylstyrene p-'-dodecylstyrene, p-methoxystyrene, p-phenylstyrene, p
-chlorstyrene, 3,4-dichlorostyrene, and the like. As the copolymer of a styrene monomer and a vinyl monomer, a styrene-butadiene copolymer or a styrene-acrylic copolymer is particularly preferred. Examples of the acrylic monomer for the acrylic component include methyl acrylate, ethyl acrylate, flin-butyl acrylate, isobutyl acrylate, propyl acrylate, n-octyl acrylate, dodecyl acrylate, lauryl acrylate, 2-ethylhexyl acrylate, stearyl acrylate, 2-chloroethyl acrylate, phenyl acrylate, methyl α-chloroacrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, n-butyl methacrylate, methacrylate Inbutyl acrylate, n-octyl methacrylate, dodecyl methacrylate, lauryl methacrylate, methacrylic acid 2
-Ethyl (15) α-methylene aliphatic monocarboxylic acid esters such as hexyl, stearyl methacrylate, phenyl methacrylate, dimethylamine ethyl methacrylate, diethylaminoethyl methacrylate; acrylonitrile, methacrylonitrile, acrylamide, etc. Examples include acrylic acid or methacrylic acid derivatives, and others. These monomers can be used alone or in combination. In particular, a terpolymer consisting of the three components styrene-methyl methacrylate-butyl methacrylate is preferred. The polyester resin suitably used as the binder resin in the present invention is obtained by polycondensation of alcohol and carboxylic acid, and examples of the alcohol used include ethylene glycol, diethylene glycol,
Diols such as triethylene glycol, 2-globylene glycol, 1,3-propylene glycol, 1,4-butanediol, neopentyl glycol, 1,4-butynediol, 1,4-bis(hydroxymethyl ) Cyclohexane and bisphenol, hydrogenated bisphenol A1 polyoxyethylenated bisphenol A1 polyoxypropylenated bisphenol hq, etherified bisphenols, and other dihydric alcohol monomers can be suspended. Examples of carboxylic acids include maleic acid, fumaric acid, meconic acid, citraconic acid, itaconic acid, glutaconic acid, fucuric acid, isophthalic acid, terephthalic acid, cyclohexanedicarboxylic acid, succinic acid, adipic acid, cepatic acid, and malonic acid. Examples include acids, anhydrides of these acids, dimers of lower alkyl esters and υruic acid, and other divalent organic acid monomers. It is also suitable to use not only a polymer containing only a difunctional monomer as described above, but also a polymer containing a component containing a trifunctional or higher polyfunctional monomer. Examples of trihydric or higher polyhydric alcohol monomers include sorbitol, (17) 2.3.6-hexantetrol, 1.4-sorbitan, pentaerythritol, dipentaerythritol, tripentaerythritol, Sucrose, 1゜2.4-butanetriol, 1,2.5-pentanetriol, glycerol, 2-methylpronotriol, 2-methyl-
Examples include 1,2,4-butanetriol, trimethylolethane, trimethylolpropane, 1,3,5-trihydroxymethylbenzene, and others. In addition, as the trivalent or higher polyvalent carboxylic acid monomer, for example, 1
, 2.4-benzenetricarboxylic acid, 1,2°5-benzenetricarboxylic acid, 1,2.4-Schiff. Hexanetricarboxylic acid, 2,5.7-naphthalenetricarboxylic acid, 1.2',4-naphthalenetricarboxylic acid, 1,2.4-butanetricarboxylic acid, 1,2゜5-hexanetricarboxylic acid, ■,3-dicarboxylic acid carboxylu 2-
Methyl-2-methylenecarboxypropane, tetra(methylenecarboxyl)methane, 1.2,7.8-octanetetracarboxylic acid, Empol trimer acid, acid anhydrides thereof, and others (18) . The toner particles of the toner of the present invention are as described in 1. -PA and H
- Contains a coloring agent in the particles of a binder resin containing PA, and further contains a property improver that is added as necessary, and when forming a magnetic toner, it can be used together with the colorant or instead of the colorant. The magnetic material is contained in the magnetic material. As a coloring agent, carbon black, nigrosine dye (
C1I, rot50415B), aniline blue (e, I
. 450405), Calco Oil Blue (C, I, /l
6azoec131ue 3), Kurumi x o -
(C11, /1614090), Ultramarine Blue (C,1, A77103), DuPont Oil Red (C
, I, scrap 26105), quinoline yellow (C, I,
47005), methylene blue chloride (C6I
, A32015), Phthalocyanine Blue (C1I. A74160), Malachite Green Offsalate (C
, l, /VL42000), lamp black (C,
I, A77266), Rose Bengal (C, 1, rot 4
5435), mixtures thereof, and others. These colorants need to be contained in a sufficient proportion to form a visible image of sufficient concentration (19), and are usually 1 to 20 parts per 100 parts by weight of the binder resin. It is considered a percentage. The magnetic material may be a metal or alloy that exhibits ferromagnetism such as ferrite, magnetite, iron, cobalt, or nickel, or a compound containing these elements, or a material that does not contain a ferromagnetic element but can be made by subjecting it to appropriate heat treatment. Mention may be made of alloys which become ferromagnetic, such as alloys of the type called Heusler alloys containing manganese and copper, such as manganese-copper-aluminum, manganese-steel-tin, or chromium dioxide, among others. These magnetic substances are uniformly dispersed in a binder resin in the form of fine powder with an average particle size of 0.1 to 1 micron to form a toner. The content of the magnetic material in the toner is 20 to 70 parts by weight, preferably 4 to 70 parts by weight, per 100 parts by weight of the binder resin. The toner of the present invention most generally comprises a binder resin;
H-PA and L-PA, colorant, and magnetic JP-A-8358
-215659 (6) When making a magnetic toner, it is manufactured by mixing fine powder of magnetic material and necessary property improvers, heating and melting, kneading, cooling, pulverizing and classifying. However, it is of course not limited to this method. The particle size of the toner of the present invention is 5 to 50 microns, preferably 1
It is 0 to 30 microns. The toner of the present invention can be used as either a -component toner or a two-component toner, and when used as a -component toner, it may contain a magnetic material as described above, or a two-component toner. When used as a developer, it is mixed with a carrier such as iron or glass beads to form a developer. Carriers can be broadly classified into general conductive carriers and insulating carriers, and the former is preferably oxidized or unoxidized iron powder, and the latter is iron,
A typical example is one in which the surface of carrier core particles made of a magnetic material such as nickel, cobalt, or ferrite is coated with an insulating resin. The toner for developing electrostatic images of the present invention is as described above (21).As will be clear from the description of the examples below, the toner is composed of a plurality of polyalkylenes each having an effect as an anti-offset agent and mutually compatible. L-PA and H-FA have different softening points.
Since both of these are contained, the offset generation temperature is high and excellent non-offset properties are obtained, and the winding generation temperature is low, so the practical fixing temperature range is wide and is at a suitable temperature level. Furthermore, it has excellent fluidity and storage stability, and can always produce good appearance and fixation. That is, by containing both L-PA and H-PA, it is possible to improve the unfavorable points that would appear when only -1000 is contained. Examples of the present invention will be described below, but the present invention is not limited thereto. Note that "parts" also represent parts by weight. Example 1 The weight ratio of the styrene component, methyl methacrylate component, and butyl methacrylate component was 5=2:3,
Weight average molecular weight Mw = 95000, number (22) M weight average molecular weight Mw for average molecule JI Mn IfC
100 parts of a binder resin consisting of a combination of styrene-methyl methacrylate-butyl methacrylate having a ratio Iww/MnO value of 9.9 and a softening point of 137°C as measured by a Koka type flow tester, and as H-PA. Polypropylene "Viscol 660P" with a softening point of 145℃
J (manufactured by Sanyo Chemical Industries, Ltd.) and 2 parts of polyethylene "Mitsui Hiwax 220M" with a softening point of 113°C as L-PA.
Mix 2 parts of PJ (Mitsui Petrochemical Industries, Inc.!R) with 10 parts of carbon black, and follow the usual toner manufacturing method by heating, kneading, cooling, pulverizing, and classifying to obtain an average particle size of 13 to 15. A micron toner of the present invention was produced. This is referred to as [toner IJ]. Example 2 As L-PA, polyethylene with a softening point of 122°C "Mitsui Hiwax 310MIJ (92 parts of Mitsui Petrochemical Industries Co., Ltd.) was used instead of Mitsui Hiwax 220MPJ, but in the same manner as in Example 1. A toner of the present invention having an average particle size of 13 to 15 microns was produced (23).This is referred to as "Toner 2".Example 3 H-PA, !=1."'C1l"'Hisnia-R6
60PJ (7) Instead, polypropylene 1-viscol 550PJ (manufactured by Sanyo Chemical Industries, Ltd.) with a softening point of 150°C
Using 2.5 parts of L-PA, polyethylene with a softening point of 107°C [Sunwax 1511'J (Sanyo Chemical Industries, Ltd.) was used instead of ``Mikata Hiwax 2201'' PJ.
A toner of the present invention having an average particle size of 13 to 15 microns was produced in the same manner as in Example 1, except that 2.5 parts of the toner was used. This is referred to as 1-toner 3J. Example 4 1-i-PA Using 1.5 parts of polypropylene [Viscol 660)'J with a softening point of 145°C as A, b-
As the PA, the same procedure as Example 1 was used except that 1.5 parts of polyethylene with a softening point of 128"C [Mikata Hiwax 200PJ (manufactured by Mikata Petrochemical Industry Co., Ltd.)] was used instead of [\Mikata Hiwax 220MPJ]. Similarly, average particle size 13-15
A micron toner of the present invention was produced. This is called Toner 4. As implementation f115 H-P A, polyethylene with a softening point of 132°C [three-piece high wax 4
A toner of the present invention having an average particle size of 13 to 15 microns was produced in the same manner as in Example 1 except for using 2 parts of 00PJ (manufactured by Mikata Petrochemical Industry Co., Ltd.). This is called 1 toner 5. Example 6 The ratio of styrene component, methyl methacrylate component, and n-butyl acrylate component is 75:5:20, respectively.
It consists of a high molecular weight component and a low molecular weight component in the same ratio of 70:20:10, M, w = 75,000, ratio Mw/
100 parts of styrene-methyl methacrylate-n-butyl acrylate copolymer with an Mn value of 7.5 and a softening point of 132°C as measured by a Koka type flow tester, styrene-methyl methacrylate-butyl methacrylate copolymer A toner of the present invention having an average particle size of 13 to 15 microns was produced by pressing in the same manner as in Example 1 except that the resin was used as a binder resin instead of being combined. This will be referred to as "toner 6". (25) Example 7 Triethylene glycol 300.9 and isophthalic acid 1
82 g and benzene-1,2,4-tricarvone [13
8 and 9 are placed in a round-bottomed flask equipped with a temperature side, a stainless steel stirrer, a glass nitrogen gas inlet tube, and a flow-down condenser.The flask is set on a mantle heater, and nitrogen is injected from the nitrogen gas inlet tube. Gas was introduced and allowed to flow while maintaining an inert atmosphere inside the flask. Then, 0.05.9% dibutyl oxide was added, and the reaction was allowed to proceed at a temperature of 200° C. while monitoring the reaction at the softening point, thereby producing polyester resin A. The same procedure as in Example 1 was carried out except that 100 parts of this polyester resin A was used as the binder resin.
A 15 micron toner of the present invention was produced. This will be referred to as "toner 7". Example 8 50 parts of the same polyester resin A as in Example 7, 50 parts of magnetic powder [Mapico Black HL-100J (manufactured by Titanium Kogyo Co., Ltd.)], 3 parts of Car Pump (26) rack, and nigrosine base. EXJ (e,
I, l65041511), 2 parts and H-P A
Polypropylene [Viscol 660PJ1.5fJ with a softening point of 145°C as L-FA and 1.5fJ with a softening point of 145°C as
Mix 1.5 parts of Iwatsukusu 200PJ at 28°C and follow the usual toner manufacturing method by heating, kneading, cooling, crushing, and classifying to obtain an average particle size of 13 to 15.
A micron magnetic toner according to the present invention was produced. This is referred to as "toner 8". Comparative Example 1 The first sample used as H-PA in Example 6. Polypropylene [Viscol 660P] with a softening point force of 145°C
The amount of was 4 parts, and the polyethylene with a softening point of 113°C used as L-PA was removed, except for the same procedure as in Example 6.
A comparative toner having an average particle size of 13 to 15 microns was produced in the same manner as described above. This is referred to as "Comparative Toner 11." Comparative Example 2 Polypropylene with a softening point of 145°C, which was used as H-PA in Example 6, was removed, and the polypropylene with a softening point of 113°C, which was used as L-PA (27), was removed. A comparative toner having an average particle size of 13 to 15 microns was produced in the same manner as in Example 6, except that the amount of polyethylene "Three Pieces High Wax 220i MPJO was changed to 4 parts. This is referred to as Comparative Toner 21. Experimental Example Implementation Toners 1-7 produced according to Examples 1-7 and H
Comparative Toners 1 and 2 Manufactured by Part 22 Parts 1 and 2
Nine types of developers on the gold side were prepared by mixing 95 weight parts of iron powder carrier in each of the five overprinted parts, and their fluidity and cohesiveness were examined. Then, a heat roller whose surface layer is made of DEFRON (poly, tetrafluoroethylene manufactured by DuPont) and
Constant N'c consisting of a crushing roller made of silicone rubber [E-13001 (TVJ (manufactured by Shin-Etsu Chemical Co., Ltd.)]
An electrostatic charge image was formed by a normal electrophotographic method by applying each of the above-mentioned FA imagers to a modified electrophotographic copying machine "U-Bix VJ (Konishi Roku Photo Industry Co., Ltd.! A) equipped with i. was developed, the formed toner image was transferred onto plain paper, fixed using a fixed N machine, and then the blank paper was transferred to the same strip 1.
1 open"258-21!'1G59 (8) The operation of sending the toner to the fixing device at the bottom and outside and observing whether or not toner stains occur is performed while the set temperature of the heat roller of the fixing device is sequentially increased. The temperature at which offset occurs was determined by repeating the above procedure to determine the temperature at which offset occurs. Using a so-called flat black original, the operation of fixing the transfer paper with toner adhered to almost the entire surface was carried out using the constant N meter in accordance with the measurement of the temperature at which offset occurred. The set temperature of the heat roller was successively lowered to determine the temperature at which wrapping occurred, and the fixing performance was also examined with respect to the pressure of the copied image using a developer that did not cause wrapping at a temperature of 150°C. Regarding the temperature, place the sample in a container and heat it to 40℃.
The presence or absence of aggregation was examined when the sample was left in an atmosphere at ℃ for 24 hours. Toner 8 produced in Example 8 was used as a developer and used in an electrophotographic copying machine called "TJ-
The same experiment as described above was conducted, except that a modified version of Bix 'l'J (manufactured by Konishiroku Photo Industry Co., Ltd.) was used. The results of the above experiments are shown in the table below. (30) In the table, "PP" stands for polypropylene, and "P" stands for polyethylene. From the results of this table, it can be seen that according to the present invention, the offset generation temperature is high and winding occurs. The temperature is low, so the practical fixing temperature range is wide, and it is at an appropriate temperature. It has excellent fluidity, cohesiveness, and fixing properties, and can always perform good development and fixing. We can provide toner for developing charge images. Agent: Tomohiko Ooi, Benmisakishi ・1.・4- Procedural amendment (voluntary) August 29, 1980 Kazuo Wakasugi, Commissioner of the Japan Patent Office 1 Indication of the case 1982 Patent Application No. 97761 2. Title of the invention Toner for developing electrostatic image 3. Relationship to the case of the person making the amendment Patent applicant name (Name) (127) Particle size of Konishiroku Photo Industry Co., Ltd. Corrected to mean 1!t7 child A for the toner of the present invention.

Claims (1)

[Scope of Claims] 1) An electrostatic image developing device comprising a binder resin, a first polyalkylene, and a second polyalkylene having a higher softening point than the first polyalkylene. toner. 2) The softening point of the first polyalkylene is 80 to 150.
℃ range, and the softening point of the second polyalkylene is in the range of 120 to 180℃ and is higher than the softening point of the first polyalkylene by 5℃ or more, according to claim 1. Toner for developing electrostatic images. 3) The toner for developing an electrostatic image according to claim 2, wherein the difference between the softening point of the second polyalkylene and the softening point of the first polyalkylene is in the range of 10 to 50°C. 4) The weight ratio of the first polyalkylene and the second polyalkylene is 1:9 to 9:1, and (2) the total content ratio of the first polyalkylene and the second polyalkylene to the whole. The toner for developing an electrostatic image according to claim 1, wherein the amount is 0.1 to 20% by weight. 5) The toner for developing electrostatic images according to claim 1, wherein the binder resin has a ratio of weight average molecular weight to number average molecular weight of 3.5 or more. 6) The toner for developing electrostatic images according to claim 1 or 5, wherein the binder resin is made of a polymer or copolymer of styrene monomers, or a polyester resin.