JP2640163B2 - Liquid developer for electrostatic photography - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a liquid developer for electrostatography comprising at least a resin dispersed in a carrier liquid having an electric resistance of not less than 10 ⁹ Ωcm and a dielectric constant of not more than 3.5. In particular, the present invention relates to a liquid developer having excellent redispersibility, storage stability, stability, image reproducibility, and fixability.

(Prior Art) A general liquid developer for electrophotography is a petroleum-based resin such as an organic or inorganic pigment or dye such as carbon black, nigrosine or phthalocyanine blue and a natural or synthetic resin such as alkyd resin, acrylic resin, rosin or synthetic rubber. Dispersed in a liquid with high insulation and low dielectric constant such as aliphatic hydrocarbons, and added with a polarity controlling agent such as a polymer containing metal soap, lecithin, linseed oil, higher fatty acid, and vinylpyrrolidone. .

In such a developer, the resin is dispersed in the form of particles having a diameter of several nm to several hundred nm as insoluble latex particles,
In the conventional liquid developer, the soluble dispersion stabilizing resin and the polarity controlling agent were easily diffused into the solution due to insufficient bonding between the soluble dispersion stabilizing resin and the polarity controlling agent and the insoluble latex particles. For this reason, there has been a drawback that the soluble dispersion stabilizing resin is detached from the insoluble latex particles due to long-term storage or repeated use, and the particles settle, aggregate, accumulate, and the polarity becomes unclear. Also, once aggregated,
The deposited particles are difficult to re-disperse, so that the particles remain attached to the developing device everywhere, leading to failure of the developing device such as contamination of an image area and clogging of a liquid feeding pump.

In order to improve these drawbacks, a means for chemically bonding a soluble dispersion stabilizing resin and insoluble latex particles has been devised, and is disclosed in US Pat. No. 3,990,980.
However, the dispersion stability of these liquid developers against spontaneous sedimentation of particles has been improved to some extent, but it is still insufficient, and when used in an actual developing device, the toner adhered to each part of the device becomes a coating film. In addition, it is difficult to re-disperse, and furthermore, it is not sufficient for re-dispersion stability which can be used practically, for example, it causes a failure of the apparatus, stains of a copied image, and the like. Further, in the method for producing resin particles described above, in order to produce monodisperse particles having a narrow particle size distribution, there is a remarkable restriction on the combination of a dispersion stabilizer to be used and a monomer to be insolubilized. This resulted in particles having a large amount of coarse particles and a wide roughness distribution, or polydisperse particles having two or more average particle diameters. In addition, it was difficult to obtain a desired average particle size with monodisperse particles having a narrow particle size distribution, and large particles of 1 μm or more or very fine particles of 0.1 μm or less were formed. Further, there is a problem that the dispersion stabilizer to be used must be produced through a complicated and time-consuming production process.

Furthermore, in order to improve the above-mentioned drawbacks, insoluble dispersed resin particles of a copolymer of a monomer to be insolubilized and a monomer containing a long-chain alkyl moiety or a monomer containing two or more polar components. The method of improving the dispersibility of the particles, redispersibility, storage stability by the method described in JP-A-60-179751, 62-15
It is disclosed in 1868 and the like. Further, in the presence of a polymer utilizing a bifunctional monomer or a polymer utilizing a polymer reaction, an insoluble dispersed resin particle of a copolymer of a monomer insolubilized and a monomer containing a long-chain alkyl moiety Methods for improving the dispersibility, redispersibility and storage stability of the particles are disclosed in JP-A-60-185963 and JP-A-61-63855.

(Problems to be Solved by the Invention) On the other hand, in recent years, a method of printing a large number of 5,000 or more sheets using a master plate for offset printing by an electrophotographic method has been attempted. It has become possible to print 10,000 sheets or more in plate size. Further, the operation time of the electrophotographic plate making system has been shortened, and improvement in speeding up the development-fixing process has been performed.

In addition, the demand for rationalization in the electrophotographic plate making system has been increased, and more specifically, the maintenance period of the plate making machine has been extended. This demands a liquid developer that can be used for a long time without replacement.

JP-A-60-179751, JP-A-62-151868, JP-A-60-18596
No. 3, the dispersed resin particles manufactured according to the means disclosed in No. 61-63855, when using a long maintenance period or when the development speed is increased,
In the case of a master plate having a large plate size (for example, A-3 size or larger), the dispersibility, redispersibility, and printing durability of the particles are still not necessarily satisfactory. It was not the performance to be performed.

In particular, when the maintenance period of the plate making machine is lengthened to improve operability, or even when a large plate making machine for a large plate size master plate is used, the developing device is not stained and the copied image is not damaged. When trying to improve the image quality, improving the redispersibility of the dispersed resin particles has been a major issue.

The present invention solves the problems of the conventional liquid developer as described above.

An object of the present invention is to provide a liquid developer having excellent dispersion stability, redispersibility and fixability even in an electrophotographic plate making system in which a development-fixing process is accelerated and a maintenance interval is set to be long. To provide.

Another object of the present invention is to provide a liquid developer which has a rapid development-fixing process and has excellent dispersion stability, redispersibility and fixability even in an electrophotographic plate making system using a large-size master plate. To provide.

Another object of the present invention is to provide a liquid developer capable of producing an offset printing master having excellent printing ink oil sensitivity and printing durability by electrophotography.

Another object of the present invention is to provide a liquid developer suitable for various kinds of electrophotography and various kinds of transfer in addition to the above-mentioned applications.

Still another object of the present invention is to provide a liquid developer that can be used in any system where a liquid developer can be used, such as ink jet recording, cathode ray tube recording, and recording of various change processes such as pressure change or electrostatic change. That is.

(Means for solving the problem) The above-mentioned objects are to achieve an electric resistance of at least 10 ⁹ Ωcm and a dielectric constant of 3.5
A liquid developer for electrostatography comprising at least resin particles dispersed in the following non-aqueous solvent, wherein the dispersed resin particles comprise a block A containing at least a polymer component represented by the following general formula (I): , Carboxyl group, sulfo group, hydroxyl group, formyl group, amino group, phosphono group, and (Q ₀ represents a —Q ₁ group or —OQ ₁ group, and Q ₁ represents a hydrocarbon group.) A polymer component and / or a monofunctional monomer containing at least one polar group selected from And a block B comprising a polymer component corresponding to (A), comprising an AB block copolymer having a weight average molecular weight of 1 × 10 ^{4 to} 5 × 10 ⁵ and soluble in the non-aqueous solvent. In the presence of the dispersion stabilizing resin, the monofunctional monomer (A) which is soluble in the non-aqueous solvent but is insolubilized by polymerization, and the following general formula (I)
A) a solution containing at least one monomer (B) containing an aliphatic group having 8 or more carbon atoms and having a copolymerization reaction with the monomer (A) shown in I), This has been achieved by a liquid developer for electrostatography, which is a copolymer resin particle obtained by a polymerization reaction.

General formula (I) Wherein (I), V ₀ is _{-COO -, - OCO-, CH 2} l COO-,
CH _{2 l} OCO— or —O— (1 represents an integer of 1 to 3).

R ₀ represents an aliphatic group having 10 or more carbon atoms.

a ₁ and a _{2, which} may be the same or different, a hydrogen atom, a halogen atom, a cyano group, a hydrocarbon group, -COO-D ₁ or -COO-D ₁ (D ₁ via a hydrocarbon group hydrogen Atom or a hydrocarbon group which may be substituted).

General formula (II) In the general formula (II), E ¹ represents an aliphatic group having 8 or more carbon atoms.

U is -COO-, -CONH-, (E ² represents an aliphatic group), —OCO—, —CH ₂ COO—, or —O—.

e ¹ and e ₂ may be the same or different and each represents a hydrogen atom, an alkyl group, —COOE ³ or —CH ₂ —COOE ³ (E ³ represents an aliphatic group).

 Hereinafter, the liquid developer of the present invention will be described in detail.

The electric resistance used in the present invention is 10 ⁹ Ωcm or more, and the dielectric constant is 3.5.
As the following carrier liquid, a linear or branched aliphatic hydrocarbon, alicyclic hydrocarbon, or aromatic hydrocarbon, and a halogen-substituted product thereof can be preferably used. For example, octane, isooctane, decane, isodecane, decalin, nonane, dodecane, isododecane, cyclohexane, cyclooctane, cyclodecane, benzene, toluene, xylene, mesitylene, isoper E,
Isopar G, Isopar H, Isopar L (Isoper; trade name of Exxon), Cielsol 70, Cielsol 71 (Cielsol; trade name of Ciel Oil), AMSCO OMS, AMSCO 460 solvent (Amsco; trade name of Spirits), etc. Are used alone or in combination.

Non-aqueous dispersion resin particles, which are the most important components in the present invention (hereinafter sometimes referred to as latex particles)
Contains a monofunctional monomer (A) and an aliphatic group having 8 or more carbon atoms in a non-aqueous solvent in the presence of a dispersion stabilizing resin which is an AB type block copolymer of the present invention. It is produced by copolymerizing the monomer (B) (so-called polymerization granulation method).

Here, as the non-aqueous solvent, basically, any solvent that is miscible with the carrier liquid of the liquid developer for electrostatography can be used.

That is, the solvent used for producing the dispersed resin particles may be any solvent that is miscible with the carrier liquid, and is preferably a linear or branched aliphatic hydrocarbon, alicyclic hydrocarbon, or aromatic hydrocarbon. Hydrogen and halogen-substituted products thereof are exemplified. For example, hexane, octane, isooctane, decane, isodecane, decalin, nonane, dodecane, isododecane, isopaffin petroleum solvents such as Isopar E, Isopar G, Isopar H, Isopar L, Cielsol 70, Cielsol 71, Amsco OM
S, Amsco 460 solvent or the like is used alone or as a mixture.

Solvents that can be used in combination with these organic solvents include alcohols (eg, methyl alcohol,
Ethyl alcohol, propyl alcohol, butyl alcohol, fluorinated alcohol, etc., ketones (eg, acetone, methyl ethyl ketone, cyclohexanone, etc.), carboxylic esters (eg, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, methyl propionate, propionate) Ethyl ether, etc.), ethers (eg, diethyl ether, dipropyl ether, tetrahydrofuran, dioxane, etc.), halogenated hydrocarbons (eg, methylene dichloride, chloroform, carbon tetrachloride, dichloroethane,
Methyl chloroform, etc.).

The non-aqueous solvent used by mixing these, after polymerization granulation,
It is desirable to evaporate under heating or under reduced pressure.However, as a latex particle dispersion, even if brought into the liquid developer, there is a problem if the liquid resistance of the developer can satisfy the condition of 10 ⁹ Ωcm or more. No.

Usually, it is preferable to use the same solvent as the carrier liquid at the stage of producing the resin dispersion. As described above, linear or branched aliphatic hydrocarbons, alicyclic hydrocarbons, aromatic hydrocarbons, halogenated Hydrocarbons and the like.

Monomers used in producing the non-aqueous dispersion resin,
A monofunctional monomer (A) which is soluble in the non-aqueous solvent but insolubilized by polymerization; and a monofunctional monomer (C) having an aliphatic group having 8 or more carbon atoms represented by the general formula (II). The monomer (B) which can be copolymerized with the monomer (A) can be distinguished.

The monomer (A) in the present invention may be any monofunctional monomer which is soluble in a non-aqueous solvent but insolubilized by polymerization. Specifically, for example,
Examples include a monomer represented by the following general formula (III).

General formula (III) In the formula (III), V ₁ represents —COO—, —OCO—, —CH ₂ OCO—, —CH
_{2 COO -, - O -,} - CONHCOO -, - CONHOCO -, - SO 2 -, Represents Here, D ₂ is a hydrogen atom or an aliphatic group having 1 to 8 carbon atoms which may be substituted (for example, a methyl group, an ethyl group, a propyl group, a butyl group, a 2-chloroethyl group,
Bromoethyl group, 2-cyanoethyl group, 2-hydroxyethyl group, benzyl group, chlorobenzyl group, methylbenzyl group, methoxybenzyl group, phenethyl group, 3-phenylpropyl group, dimethylbenzyl group, fluorobenzyl group, 2-methoxyethyl A 3-methoxypropyl group).

R ₁ is a hydrogen atom or an aliphatic group having 1 to 6 carbon atoms which may be substituted (for example, a methyl group, an ethyl group, a propyl group, a butyl group, a 2-chloroethyl group, a 2,2-dichloroethyl group, 2,2-trifluoroethyl group, 2-bromoethyl group, 2-glycidylethyl group, 2-hydroxyethyl group, 2-hydroxypropyl group, 2,3-dihydroxypropyl group, 2-hydroxy-3-chloropropyl group, 2
-Cyanoethyl group, 3-cyanopropyl group, 2-nitroethyl group, 2-methoxyethyl group, 2-methanesulfonylethyl group, 2-ethoxyethyl group, N, N-dimethylaminoethyl group, N, N-diethylaminoethyl group , Trimethoxysilylpropyl group, 3-bromopropyl group, 4-
Hydroxybutyl group, 2-furfurylethyl group, 2-thienylethyl group, 2-pyridylethyl group, 2-morpholinoethyl group, 2-carboxyethyl group, 3-carboxypropyl group, 4-carboxybutyl group, 2-phosphoethyl Group, 3-sulfopropyl group, 4-sulfobutyl group, 2
-Carboxyamidoethyl group, 3-sulfamidopropyl group, 2-N-methylcarboxamidoethyl group, cyclopentyl group, chlorocyclohexyl group, dichlorohexyl group, etc.).

b ₁ and b ₂ may be the same or different, each represent the same contents as a ₁ or a ₂ in the general formula (I).

Specific monomers (A) include, for example, those having 1 to 1 carbon atoms.
6 vinyl esters or allyl esters of aliphatic carboxylic acids (acetic acid, propionic acid, butyric acid, monochloroacetic acid, trifluoropropionic acid, etc.); unsaturated acids such as acrylic acid, methacrylic acid, crotonic acid, itaconic acid, and maleic acid Alkyl esters or amides of a carboxylic acid having 1 to 4 carbon atoms which may be substituted (for example, methyl group, ethyl group, propyl group, butyl group, 2-chloroethyl group, 2-bromoethyl group, 2-fluoroethyl group as the alkyl group) Group, trifluoroethyl group, 2-hydroxyethyl group, 2
-Cyanoethyl group, 2-nitroethyl group, 2-methoxyethyl group, 2-methanesulfonylethyl group, 2-benzenesulfonylethyl group, 2- (N, N-dimethylamino)
Ethyl group, 2- (N, N-diethylamino) ethyl group, 2
-Carboxyethyl group, 2-phosphoethyl group, 4-carboxybutyl group, 3-sulfopropyl group, 4-sulfobutyl group, 3-chloropropyl group, 2-hydroxy-3-
Chloropropyl group, 2-furfurylethyl group, 2-pyridinylethyl group, 2-thienylethyl group, trimethoxysilylpropyl group, 2-carboxyamidoethyl group, etc .; styrene derivatives (eg, styrene, vinyltoluene, α-methyl) Styrene, vinylnaphthalene, chlorostyrene, dichlorostyrene, bromostyrene, vinylbenzenecarboxylic acid, vinylbenzenesulfonic acid, chloromethylstyrene, hydroxymethylstyrene, methoxymethylstyrene, N, N-dimethylaminomethylstyrene, vinylbenzenecarboxamide, Unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, and itaconic acid;
Maleic acid, itaconic acid cyclic acid anhydride; acrylonitrile; methacrylonitrile; polymerizable double bond group-containing heterocyclic compound (specifically, for example, "Polymer Data Handbook-Basic Edition-" edited by The Society of Polymer Science, Japan , P175-184, compounds described in Baifukan (1986), for example, N-vinylpyridine, N-vinylimidazole, N-vinylpyrrolidone, vinylthiophene, vinyltetrahydrofuran,
Vinyloxazoline, vinylthiazole, N-vinylmorpholine and the like).

 Two or more monomers (A) may be used in combination.

Next, the monomer (B) represented by the general formula (II) used in the present invention will be further described.

In the general formula (II), preferably, E ¹ represents an alkyl group which may be substituted having 10 or more carbon atoms or an alkenyl group having 10 or more carbon atoms, and U represents -COO-, -CONH-, [However, E ² preferably represents an aliphatic group having 1 to 32 carbon atoms (as the aliphatic group, for example, an alkyl group, an alkenyl group or an aralkyl group)], -OCO-, -CH ₂ OCO-, Or -O-.

e ¹ and e ² may be the same or different and preferably represent a hydrogen atom, a methyl group, —COOE ³ or —CH ₂ COOE ³ (provided that E
³ preferably represents an alkyl group, alkenyl group, aralkyl group or cycloalkyl group having 1 to 32 carbon atoms. ).

Still more preferably, in formula (II), U is -COO-,
-CONH- or Wherein e ¹ and e ² may be the same or different and each represent a hydrogen atom or a methyl group, and E ¹ has the same contents as described above.

Specific examples of the monomer (B) represented by the general formula (II) include an aliphatic group having a total of 10 to 32 carbon atoms (the aliphatic group is a halogen atom, a hydroxyl group, an amino group, an alkoxy group, or the like). Or a heteroatom such as an oxygen atom, a sulfur atom, a nitrogen atom, etc.
Esters of unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid and itaconic acid having a carbon bond (may be decyl, dodecyl, tridecyl, tetradecyl as aliphatic groups) Group, hexadecyl group, octadecyl group, docosanyl group,
Dodecenyl group, hexadecenyl group, oleyl group, linolein group, docosenyl group, etc.); amides of the above-mentioned unsaturated carboxylic acids (the aliphatic groups are the same as those shown for the esters); higher aliphatic vinyl esters Or allyl esters (eg, higher fatty acids such as lauric acid, myristic acid, stearic acid, oleic acid, linoleic acid, and behenic acid); or vinyl ethers (aliphatic) substituted with an aliphatic group having a total of 10 to 32 carbon atoms The group represents the same range as the above-mentioned aliphatic group of the unsaturated carboxylic acid).

The dispersion stabilizing resin used in the present invention is an AB block copolymer, and one block (referred to as block A) is composed of a polymer component comprising a repeating unit represented by the general formula (I). The other one block (referred to as block B) is a polymer component containing at least one kind of polar group selected from the above-mentioned specific polar groups and / or
Or a polymer component corresponding to the above-mentioned monofunctional monomer (A), and having a weight average molecular weight of 1 × 10 ^{4 to} 5 × 1
It is characterized by being 0 ⁵ .

The proportion of the blocks A and B in the AB block copolymer is preferably 99/1 to 50/50 (weight ratio).

The specific polar group-containing polymer component contained in the block B is preferably 1 to 30 parts by weight, more preferably 1 to 15 parts by weight, per 100 parts by weight of the dispersion stabilizing resin. When no specific polar group-containing polymer component is present in the block B, the polymer component corresponding to the monofunctional monomer (A) is preferably used in an amount of 5 to 5 parts by weight in 100 parts by weight of the resin.
0 parts by weight, more preferably 10 to 40 parts by weight.

The weight average molecular weight of the AB block copolymer is preferably 2 × 10 ⁴ to 1 × 10 ⁵ .

The repeating unit represented by the general formula (I) constituting the block A will be described in detail.

In the general formula (I), V ₀ is preferably -COO-, -O
Represents CO- or -O-.

R ₀ represents an alkyl group or an alkenyl group having 10 or more carbon atoms, which may be linear or branched. Specifically, decyl group, dodecyl group, tridecyl group, tetradecyl group, hexadecyl group, octadecyl group, eicosanyl group, docosanyl group, decenyl group, dodecenyl group, tridecenyl group, hexadecenyl group, octadecenyl group, linolel group, etc. .

a ₁ and a ₂ may be the same or different from each other, and are preferably a hydrogen atom, a halogen atom (for example, a chlorine atom,
Bromine atom, etc.), cyano group, alkyl group having 1 to 3 carbon atoms (eg, methyl group, ethyl group, propyl group, etc.), -COO
-D ₁ or -CH ₂ COO-D ₁ [D ₁ is a hydrogen atom or an optionally substituted hydrocarbon group having 22 or less carbon atoms (for example, an alkyl group, an alkenyl group, an aralkyl group, an alicyclic group, An aryl group).

D ₁ is specifically, in addition to a hydrogen atom, a preferred hydrocarbon group such as an alkyl group having 1 to 22 carbon atoms which may be substituted (for example, a methyl group, an ethyl group, a propyl group, a butyl group, a heptyl group) Group, hexyl group, octyl group, nonyl group, decyl group, dodecyl group, tridecyl group, tetradecyl group, hexadecyl group, octadecyl group, eicosanyl group, docosanyl group, 2-chloroethyl group, 2-bromoethyl group, 2-cyanoethyl group, 2-methoxycarbonylethyl group, 2-methoxyethyl group, 3-bromopropyl group, etc., alkenyl group having 4 to 18 carbon atoms which may be substituted (for example, 2-methyl-1-propenyl group, 2-butenyl group) , 2-pentenyl group, 3-methyl-2-pentenyl group, 1-pentenyl group, 1-hexenyl group, 2-hexenyl group, 4-methyl-2 -Hexenyl group, decenyl group,
A dodecenyl group, a tridecenyl group, a hexadecenyl group, an octadecenyl group, a linolel group, etc., an optionally substituted aralkyl group having 7 to 12 carbon atoms (for example, benzyl group, phenethyl group, 3-phenylpropyl group, naphthylmethyl group, 2 -Naphthylethyl group, chlorobenzyl group, bromobenzyl group, methylbenzyl group, ethylbenzyl group, methoxybenzyl group, dimethylbenzyl group, dimethoxybenzyl group, etc.), an optionally substituted alicyclic group having 5 to 8 carbon atoms (For example, a cyclohexyl group, a 2-cyclohexylethyl group, a 2-cyclopentylethyl group, etc.), and an aromatic group which may be substituted having 6 to 12 carbon atoms (for example, a phenyl group, a naphthyl group, a tolyl group, a xylyl group, Propylphenyl group, butylphenyl group, octylphenyl group, dodecylphenyl group, meth Xyphenyl group, ethoxyphenyl group, butoxyphenyl group, decyloxyphenyl group,
Chlorophenyl, dichlorophenyl, bromophenyl, cyanophenyl, acetylphenyl, methoxycarbonylphenyl, ethoxycarbonylphenyl, butoxycarbonylphenyl, acetamidophenyl, propioamidophenyl, dodecyloylamidophenyl, etc. ).

Further, in the block A of the dispersion stabilizing resin provided in the present invention, together with the repeating unit represented by the general formula (I),
Other repeating units may be contained as a copolymer component.
The other copolymer component may be any compound as long as it is composed of a monomer copolymerizable with the monomer corresponding to the repeating unit of the general formula (I).

However, it is preferable that other components are not contained, and it is used in an amount not exceeding 20 parts by weight in the block A at most. If it exceeds 20 parts by weight, the dispersion stability of the dispersed resin particles will be deteriorated.

In the block A, two or more kinds of the repeating units represented by the general formula (I) may be used in combination.

Next, the polymer component constituting the block B of the block copolymer of the present invention will be described in detail.

The block B is composed of a polymer component corresponding to the monofunctional monomer (A) and / or the specific polar group-containing polymer component described above.

Examples of the polymer component corresponding to the monofunctional monomer (A) include the same contents as described above for the insoluble monomer (A).

Preferably, it is composed of the same monomer as the monofunctional monomer (A) to be the dispersed resin particles.

Also, among specific polar groups, In the formula, Q ₀ represents a —Q ₁ group or —OQ ₁ group, and Q ₁ represents a C 1-10 hydrocarbon group. As the hydrocarbon group for Q ₁ , preferably an aliphatic group which may be substituted and has 1 to 8 carbon atoms (eg, a methyl group, an ethyl group, a propyl group, a butyl group,
Pentyl group, hexyl group, butenyl group, pentenyl group,
A hexenyl group, a 2-chloroethyl group, a 2-cyanoethyl group, a cyclopentyl group, a cyclohexyl group, a benzyl group, a phenethyl group, a chlorobenzyl group, a bromobenzyl group or the like, or an aromatic group which may be substituted (for example, a phenyl group, a tolyl group) Group, xylyl group, mesityl group, chlorophenyl group, bromophenyl group, methoxyphenyl group, cyanophenyl group, etc.).

Further, in a polar group of the present invention, the amino group, -NH _2, -NHD ₃ or Represents D ₃ and D ₄ represent a hydrocarbon group having 1 to 10 carbon atoms, preferably a hydrocarbon group having 1 to 7 carbon atoms,
Specifically, the same meaning as the hydrocarbon group for Q ₁ described above.

Even more preferably, the hydrocarbon groups of Q ₁ , D ₃ and D ₄ are
Examples thereof include an optionally substituted alkyl group having 1 to 4 carbon atoms, an optionally substituted benzyl group, and an optionally substituted phenyl group.

As the monomer corresponding to the polymer component containing the specific polar group, any monofunctional monomer containing at least one specific polar group may be used. For example, it is described in “Polymer Data Handbook [Basic Edition]” edited by the Society of Polymer Science, Baifukan (1986). Specifically, acrylic acid, α- and / or β-substituted acrylic acid (for example, α-acetoxy form, α-acetoxymethyl form, α- (2
-Amino) methyl form, α-chloro form, α-bromo form, α
-Fluoro form, α-tributylsilyl form, α-cyano form,
β-chloro form, β-bromo form, α-chloro-β-methoxy form, α, β-dichloro form, etc.), methacrylic acid, itaconic acid, itaconic acid half esters, itaconic acid half amides, crotonic acid, -Alkenylcarboxylic acids (e.g., 2-pentenoic acid, 2-methyl-2-hexenoic acid, 2-octenoic acid, 4-methyl-2-hexenoic acid, 4-ethyl-
2-octenoic acid, etc.), maleic acid, maleic acid half-esters, maleic acid half-amides, vinylbenzene carboxylic acid, vinylbenzenesulfonic acid, vinylsulfonic acid, vinylphosphonic acid, half-esters of vinyl or allyl groups of dicarboxylic acids Derivatives, ester derivatives of these carboxylic acids or sulfonic acids, and compounds containing the polar group in the substituents of the amide derivatives, and the like.

The following are specific examples of these compounds. However, in each of the following examples, e is -H, -C
H _3, shows -Cl, -Br, -CN, a -CH ₂ COOCH ₃ or -CH ₂ COOH, f represents -H or -CH _3, n ₁ represents an integer of 2 to 10, m ₁ is An integer of 1 to 10 is shown, and l ₁ is an integer of ₁ to 4. X ₁ is -COOH, -SO ₃ H, -OH, (R _a and R _{b each} represent a C _1-4 alkyl group). X ₁ is −
Represents COOH or -OH.

The AB block copolymer of the present invention can be produced by a conventionally known polymerization reaction method. In particular,
In the monomer corresponding to the polymer component containing the specific polar group, the polar group is previously protected as a functional group, and an organometallic compound (eg, alkyl lithiums, lithium diisopropylamide, alkyl magnesium halides, etc.) or Ion polymerization reaction by hydrogen iodide / iodine system, photopolymerization reaction using porphyrin metal complex as catalyst,
Alternatively, after synthesizing an AB block copolymer by a known so-called living polymerization reaction such as a group transfer polymerization reaction, a functional group having a protected polar group is subjected to a hydrolysis reaction, a hydrogenolysis reaction, an oxidative decomposition reaction or A deprotection reaction is performed by a decomposition reaction or the like to form a polar group. One example is shown in the following reaction scheme (1).

For example, P. Lutz, P. Masson et al, Polym. Bull., 12 , 79
(1984), BCAnderson, GDAndrews et al, Macromole
cules, 14 , 1601 (1981), K. Hatada, K. Ute, et al, Polym.
J., 17, 977 (1985) , the same 18, 1037 (1986), the right hand Koichi, Koichi Hatada "Polymer Processing" 36, 366 (1987), Higashimura Satoshinobe, Mitsuo Sawamoto "polymer Collected Papers" 46, 189 (1989), M. Kuroki, T. Aid
a, J. Am. Chem. Soc., 109 , 4737 (1987), Takuzo Aida, Shohei Inoue "Synthetic Organic Chemistry" 43 , 300 (1985), DYSogah, WRH
It is easily synthesized according to the synthesis method described in ertler et al, Macromolecules, 20 , 1473 (1987).

As another method for synthesizing the AB block copolymer, it can also be synthesized by a photoiniferter polymerization method using a monomer having a polar group unprotected and using a disiocarbamate compound as an initiator. . For example, Takayuki Otsu "polymer" 37, 248 (1988), Shunichi Hinokimori, Ryuichi Otsu, Polym.Rep.
Jap., 37 , 3508 (1988), JP-A-64-111, JP-A 1-2661
It is synthesized according to the synthesis method described in No. 9, etc.

Further, the protective group for protecting the specific polar group of the present invention and the elimination of the protective group (deprotection reaction) can be easily carried out using conventionally known knowledge. For example, various descriptions are given in the above cited references, and furthermore, Yoshio Iwakura and Keisuke Kurita, "Reactive Polymers", published by Kodansha (1977)
TWGreene, "Protective Groups in Organic Sy
nthesis ", John Wiley & Sons (1981), JFWMoOm
ie, `` Protective Groups in Organic Chemistry '', Plen
um Press, (1973) and the like can be carried out by appropriately selecting a method described in detail.

The dispersing resin of the present invention comprises at least one kind of each of the monomer (A) and the monomer (B). What is important is that the resin synthesized from these monomers is insoluble in the non-aqueous solvent. If so, a desired dispersion resin can be obtained. More specifically, the monomer (B) represented by the general formula (II) is preferably used in an amount of 0.1 to 20% by weight, more preferably 0.3 to 8% by weight, based on the monomer (A) to be insolubilized. % By weight. Further, the molecular weight of the dispersion resin of the present invention is preferably from 10 ³ to 10 ⁶ , more preferably from 10 ⁴ to 10 ⁶ .

In order to produce the dispersion resin (latex particles) used in the present invention, generally, the dispersion stabilizing resin, monomer (A) and monomer (B) as described above are mixed in a non-aqueous solvent. Heat polymerization may be performed in the presence of a polymerization initiator such as benzoyl oxide, azobisisobutyronitrile, and butyllithium.

Specifically, a method of adding a polymerization initiator to a mixed solution of a dispersion stabilizing resin, a monomer (A) and a monomer (B),
A method in which the monomer (A) and the monomer (B) are dropped together with a polymerization initiator into a solution in which the dispersion stabilizing resin is dissolved,
Alternatively, a method of optionally adding the remaining monomer mixture together with the polymerization initiator to a mixed solution containing the entire amount of the dispersion stabilizing resin and a part of the mixture of the monomer (A) and the monomer (B), Furthermore, there is a method of optionally adding a mixed solution of a dispersion stabilizing resin and a monomer together with a polymerization initiator in a non-aqueous solvent, and the like, and any of these methods can be used.

The total amount of the monomers (A) and (B) is
0 to 5 parts by weight to about 5 to 80 parts by weight, preferably 10
5050 parts by weight.

The soluble resin as a dispersion stabilizer is used in an amount of 1 to 100 parts by weight, preferably 3 to 20 parts by weight, based on 100 parts by weight of the total monomers used above.

The amount of the polymerization initiator is suitably from 0.1 to 5% by weight based on the total amount of the monomers.

The polymerization temperature is about 50 to 180 ° C., preferably 60 to 180 ° C.
~ 120 ° C. The reaction time is preferably 1 to 15 hours.

In the non-aqueous solvent used for the reaction, the alcohols described above,
When polar solvents such as ketones, ethers and esters are used in combination, or when unreacted monomer (A) or monomer (B) to be polymerized and granulated remains, the solvent or monomer may be used. It is preferred to remove by heating to a temperature higher than the boiling point of the body or distilling it off or by distilling it off under reduced pressure.

Non-aqueous latex particles produced as described above,
Existence of fine and uniform particle size distribution and very stable dispersibility.Especially, even if used repeatedly for a long time in the developing device, good dispersibility and re-dispersion even if development speed is improved. This is also easy, and it is not recognized at all that any contamination occurs on each part of the apparatus.

Further, when fixed by heating or the like, a strong film was formed, and excellent fixability was exhibited.

Further, the liquid developer of the present invention has excellent dispersion stability, re-dispersibility and fixability even when the development-fixing step is speeded up and the maintenance interval is long.

In particular, the non-aqueous dispersion resin described in JP-A-60-185963 or JP-A-61-63855 contains a long-chain alkyl moiety that can be copolymerized with a monomer that is polymerized and insolubilized. Along with the monomer, a random copolymer soluble in the non-aqueous solvent containing a copolymerizable component having a polymerizable double bond group at a site distant from the polymer main chain by 8 atoms or more in total for stable dispersion. The resin particles are polymerized and granulated (latex particles) used as a resin. The dispersibility and printing durability of these particles have been greatly improved compared to conventional particles. A plate making machine using a master plate for offset printing (for example, ELP-
560, ELP-820, etc.) or if the processing speed of the plate making machine is increased, there is still a problem in the dispersibility of the particles, and the plate making machine becomes dirty (especially the developing device), and the particles coagulate and settle. Or when the master plate was printed, the strength of the image area was not yet sufficient, and the printing durability was reduced. When the resin particles used in the present invention are used, no problem occurs even under such severe conditions.

As described above, the high redispersibility of the latex particles of the present invention is due to the fact that the soluble A- used together with the insolubilizing monomer (A) and the monomer having an aliphatic group having 8 or more carbon atoms (B).
It depends on the B-type block copolymer.

That is, the dispersion stabilizing resin of the present invention has a block A composed of a polymer component containing a long-chain aliphatic group having a high affinity for the non-aqueous solvent, and a small affinity for the non-aqueous solvent,
It is an AB block copolymer in which a block B composed of a polymer component having an affinity for the monomer (A) to be insolubilized is bonded.

Thereby, the block B portion is sufficiently adsorbed to the dispersed resin particles by physicochemical interaction during polymerization granulation,
In addition, the block A portion having a high affinity for the non-aqueous dispersion medium can sufficiently solvate the solvent and sufficiently exert a steric reaction effect (so-called tail-like adsorption). It is estimated that the effects of the present invention have been achieved.

On the other hand, in a conventionally known random copolymer of the polymer component used in the block A and the polymer component used in the block B, in the polymer chain in which the component serving as the adsorbed portion is composed of a solvating component. Randomly bonded to the resin particles, the adsorption to the dispersed resin particles was not sufficient, and further, the adsorption pattern became loop-shaped, so that the steric repulsion effect was also alienated, and the dispersion stability was not sufficient. .

In addition, high printing durability which does not cause deterioration of the toner image portion when printed as an offset master master is achieved by using a monomer (A) insoluble and a monomer (B) having an aliphatic group having 8 or more carbon atoms. It is presumed that the copolymer of the above and the dispersed polymer adsorbed thereon have good compatibility with each other, are sufficiently compatible even under mild fixing conditions, and a uniform and strong film can be formed. .

If desired, a colorant may be used in the liquid developer of the present invention. The colorant is not particularly limited, and various conventionally known pigments or dyes can be used.

In the case of coloring the dispersion resin itself, for example, as one of the coloring methods, there is a method of physically dispersing the dispersion resin in a dispersion resin using a pigment or a dye. I have. For example, magnetic iron oxide powder, powdered lead iodide, carbon black, nigrosine, alkali blue, Hansa Yellow, quinacridone red, phthalocyanine blue and the like can be mentioned.

As another method of coloring, there is a method of dyeing a dispersion resin with a preferable dye as described in JP-A-57-48738. Alternatively, as another method, there is a method of chemically bonding a dispersing resin and a dye as disclosed in JP-A-53-54029, or
As described in, for example, No. 2955, there is a method of producing a dye-containing copolymer by using a monomer containing a dye in advance when producing by a polymerization granulation method.

Various additives may be added to the liquid developer of the present invention, if desired, for the purpose of enhancing charging characteristics or improving image characteristics. For example, Yuji Harazaki, "Electrophotography", Vol.
And those specifically described on page 44 are used.

For example, di-2-ethylhexylsulfosuccinic acid metal salt, naphthenic acid metal salt, higher fatty acid metal salt, lecithin,
Examples include poly (vinylpyrrolidone) and a copolymer containing a semi-maleic acid amide component.

The amounts of the main components of the liquid developer of the present invention will be described below.

The toner particles mainly composed of a resin (and a coloring agent optionally used) are used in an amount of 0.1 parts by weight per 1000 parts by weight of the carrier liquid.
5 parts by weight to 50 parts by weight are preferred. When the amount is less than 0.5 part by weight, the image density is insufficient, and when the amount is more than 50 parts by weight, fogging to a non-image portion is liable to occur. Further, the carrier liquid soluble resin for stabilizing the dispersion is also used as desired, and about 0.5 to 100 parts by weight can be added to 1000 parts by weight of the carrier liquid. The charge control agent as described above is preferably used in an amount of 0.001 to 1.0 part by weight based on 1,000 parts by weight of the carrier liquid. If desired, various additives may be added. The upper limit of the total amount of these additives is regulated by the electric resistance of the developer. That is, the electric resistance of the liquid developer from which the toner particles have been removed is 10 ⁹ Ωc
If it is lower than m, it becomes difficult to obtain a good quality continuous tone image, so it is necessary to control the amount of each additive within this limit.

(Examples) Hereinafter, a synthesis example of the dispersion stabilizing resin according to the present invention, a production example of latex particles, and an example will be described, but the content of the present invention is not limited thereto.

Synthesis Example 1 of dispersion stabilizing resin 1: P-1 95 g of dodecyl methacrylate and tetrahydrofuran 2
00 g of the mixed solution was sufficiently degassed under a nitrogen stream, and cooled to -78 ° C. 1.0 g of 1,1-diphenylbutyllithium was added and reacted for 12 hours. Further, 5 g of triphenylmethyl methacrylate and 25 g of tetrahydrofuran were added to this mixed solution.
Was sufficiently degassed under a nitrogen stream, and added, followed by further reaction for 8 hours. After the mixture was cooled to 0 ° C., 10 ml of methanol was added and reacted for 30 minutes to terminate the polymerization. The obtained polymer solution was brought to a temperature of 30 ° C. with stirring, and 30%
15 ml of a hydrogen chloride ethanol solution was added, and the mixture was stirred for 1 hour. Next, the solvent was distilled off from the reaction mixture under reduced pressure until the total amount became half, and then the reaction mixture was reprecipitated in methanol 1. The polymer obtained by collecting the precipitate and drying under reduced pressure had a weight average molecular weight of 4.5 × 10 ⁴ and a yield of 70 g.

b indicates block connection (the same applies hereinafter).

Synthesis Example 2 of Dispersion Stabilizing Resin: P-2 A mixed solution of 46 g of octadecyl methacrylate, 0.5 g of (tetraphenylporphinato) aluminum methyl and 60 g of methylene chloride was heated to 30 ° C. under a nitrogen stream. This was irradiated with light from a 300 W-xenon lamp through a glass filter from a distance of 25 cm, and reacted for 12 hours. 4 g of benzyl methacrylate was further added to this mixture, and the mixture was similarly irradiated with light for 8 hours. Thereafter, 3 g of methanol was added to the reaction mixture, followed by stirring for 30 minutes to terminate the reaction. Next, Pd—C was added to the reaction mixture, and a catalytic reduction reaction was performed at a temperature of 25 ° C. for 1 hour.

After filtering off the insoluble matter, reprecipitate in 500 ml of methanol,
The precipitate was collected and dried. The obtained polymer had a yield of 33 g and a weight average molecular weight of 3 × 10 ³ .

Synthesis Example 3 of dispersion stabilizing resin: P-3 A mixed solution of 90 g of tridecyl methacrylate and 200 g of tetrahydrofuran was sufficiently degassed under a nitrogen stream,
Cooled to ° C. 0.8 g of lithium 1,1-diphenyl-3-methylpentyl was added and stirred for 6 hours. Further, 10 g of 4-vinylphenyloxytrimethylsilane was added to this mixture, and the mixture was stirred for 6 hours. Then, 3 g of methanol was added, and the mixture was stirred for 30 minutes.

The reaction mixture is then added to a 10% 30% hydrogen chloride ethanol solution.
g, and the mixture was stirred at 25 ° C. for 1 hour, and then reprecipitated in methanol 1 to collect a precipitate. 300m of methanol in the precipitate
Washed twice with l and dried. The obtained polymer had a weight average molecular weight of 3.5 × 10 ⁴ in a yield of 58 g.

Synthesis Example 4: Dispersion Stabilizing Resin: P-4 A mixture of 95 g of hexadecyl methacrylate and 2.0 g of benzyl N, N-diethyldithiocarbamate was sealed in a container under a nitrogen stream, and heated to a temperature of 60 ° C. This is passed through a glass filter from a distance of 10 cm with a 400 W high-pressure mercury lamp,
Light irradiation was carried out for a time to carry out photopolymerization. After 5 g of acrylic acid and 180 g of methyl ethyl ketone were added thereto, the atmosphere was replaced with nitrogen and light irradiation was performed again for 10 hours.

The obtained reaction mixture was reprecipitated in 1.5 l of methanol, collected, and dried. The obtained polymer had a weight average molecular weight of 4 × 10 ⁴ in a yield of 68 g.

Synthesis Example 5 of dispersion stabilizing resin: P-5 A mixed solution of 80 g of stearyl methacrylate and 200 g of tetrahydrofuran was sufficiently degassed under a nitrogen gas flow, and was subjected to -78 ° C.
And cooled. 1.0 g of potassium 1,1-diphenyl-3-methylpentyl was added, and the mixture was stirred for 10 hours. Further, 20 g of styrene was added to this mixture, and the mixture was stirred for 8 hours. Then, the temperature of the reaction mixture was adjusted to 0 ° C., and 10 ml of methanol was added. Next, this was reprecipitated in 1.5 l of methanol, and the precipitate was collected by filtration and dried. The obtained polymer had a yield of 68 g and a weight average molecular weight of 3 × 10 ⁴ .

Production Example 1 of Latex Particles: D-1 A mixed solution of 15 g of dispersion stabilizing resin P-1, 100 g of vinyl acetate, 1.0 g of octadecyl methacrylate and 384 g of Isopar H was heated to 70 ° C. while stirring under a nitrogen stream.
2,2'-azobis (isovaleronitrile) (abbreviation AIV
N.) was added and reacted for 6 hours. Twenty minutes after the addition of the initiator, cloudiness occurred and the reaction temperature rose to 88 ° C. Temperature 100
C. and stirred for 2 hours to remove unreacted vinyl acetate.
After cooling, the white dispersion obtained by passing through a 200-mesh nylon cloth was a latex having a conversion of 90% and an average particle size of 0.24 μm.

Latex Particle Production Examples 2 to 4: D-2 to D-4 Same as Production Example 1 except that the dispersion stabilizing resin P-1 was replaced with each resin shown in Table 1 below in Production Example 1 of latex particles. Thus, each latex particle D-2 to D-4 was produced.

Production Examples 5 to 9 of Latex Particles: D-5 to D-9 Same as Production Example 1 except that the dispersion stabilizing resin P-1 was replaced with each resin shown in Table 2 below in Production Example 1 of latex particles. Thus, each latex particle D-5 to D-9 was produced. The conversion was 83-88% for each latex.

Latex Particle Production Example 10-15: D-10 to D-15 In the latex particle D-1 production example, instead of octadecyl methacrylate 1 g, 0.8 g of each of the monomers in Table 3 was used.
Each latex particle was produced in the same manner as in Production Example 1 except for using.

Production example 16 of latex particles: D-16 While stirring a mixed solution of 10 g of dispersion stabilizing resin P-10, 4 g of poly (octadecyl methacrylate), 100 g of vinyl acetate, 0.8 g of tridecyl methacrylate and 400 g of Isopar H under a nitrogen stream. Heated to a temperature of 75 ° C. 0.7 g of 2,2'-azobis (isobutylnitrile) (abbreviated AIBN)
After reacting for 0.5 hour, 0.5 g of AIBN was added and reacted for 2 hours. After cooling, the white dispersion obtained by passing through a 200-mesh nylon cloth was a latex having an average particle size of 0.20 μm.

Production Example 17 of latex particles: D-17 14 g of dispersion stabilizing resin P-11 having the following structure, vinyl acetate 90
g, 10 g of N-vinylpyrrolidone, 1.5 g of octadecyl methacrylate and 400 g of isododecane were heated to a temperature of 65 ° C. while stirring under a nitrogen stream. 1.5 g of AIBN was added and reacted for 4 hours. After cooling, the white dispersion obtained by passing through a 200-mesh nylon cloth was a latex having an average particle size of 0.25 μm.

Production Example 18 of Latex Particles: D-18 A mixture of 16 g of dispersion stabilizing resin P-4, 94 g of vinyl acetate, 6 g of crotonic acid, 2 g of hexadecyl methacrylate and Isopar G was stirred at a temperature of 60 ° C. under a nitrogen stream. Warmed. 1.0 g of AIVN was added and reacted for 2 hours. Further AIV
0.5 g of N. was added and reacted for 2 hours. After cooling, the white dispersion obtained by passing through a 200-mesh nylon cloth has an average particle size of 0.24μ.
m latex.

Production Example 19 of Latex Particles: D-19 25 g of dispersion stabilizing resin P-7, methyl methacrylate 1
A mixed solution of 00 g, 2 g of dodecyl acrylate, 0.8 g of n-dodecyl mercaptan and 688 g of Isopar H was heated to a temperature of 60 ° C. while stirring under a nitrogen stream. 0.7 g of AIVN was added and reacted for 4 hours. After cooling, the white dispersion obtained by passing through a 200-mesh nylon cloth was a latex having an average particle size of 0.25 μm.

Production Example 20 of latex particles: D-20 20 g of dispersion stabilizing resin P-12 having the following structure, styrene 100
g, octadecyl vinyl ether 2 g and Isopar H 380
g of the mixed solution was heated to a temperature of 45 ° C. while stirring under a nitrogen stream. A hexane solution of n-butyllithium was added in an amount of 1.0 g as a solid amount of n-butyllithium, and reacted for 4 hours. After cooling, the white dispersion obtained through a 200-mesh nylon cloth was latex having an average particle size of 0.28 μm.

Production Example 21 of latex particles: D-21 A mixed solution of 20 g of dispersion stabilizing resin P-13 having the following structure and 470 g of n-dodecane was stirred under a nitrogen stream at a temperature of 60.
Warmed to ° C. In this solution, methyl methacrylate 10
0 g, n-dodecyl mercaptan 1.0 g and AIVN 0.8 g
Was added dropwise over 2 hours. After reacting for 2 hours, 0.3 g of AIVN was added and reacted for 2 hours. After cooling, 200
The coarse particles were removed through a mesh nylon cloth, and the resulting white dispersion was a latex having an average particle size of 0.25 μm.

Latex Production Example 22: D-22 16 g of dispersion stabilizing resin P-14 having the following structure, vinyl acetate 100
g, 5 g of crotonic acid, 1.5 g of oxadecyl methacrylate and 468 g of Isopar E were heated to 70 ° C. while stirring under a nitrogen stream. After adding 0.8 g of AIVN and reacting for 6 hours, the temperature was raised to 100 ° C. and stirred for 1 hour.
Residual vinyl acetate was distilled off. After cooling, coarse particles were removed through a 200-mesh nylon cloth, and the resulting white dispersion was a latex having a conversion of 85% and an average particle size of 0.24 μm.

Production Example 23 of latex particles: D-23 14 g of dispersion stabilizing resin P-15 having the following structure, vinyl acetate 100
g, a mixed solution of 6.0 g of 4-pentenoic acid and 380 g of Isopar G were heated to a temperature of 75 ° C. while stirring under a nitrogen stream. 0.7 g of AIVN was added and reacted for 4 hours.
Was added and reacted for 2 hours. After cooling, coarse particles were removed through a 200-mesh nylon cloth, and the resulting white dispersion was latex having an average particle size of 0.23 μm.

Production Example 24 of Latex Particles: (Comparative Example A) In Production Example 1 of latex particles D-1, 20 g of poly (octadecyl methacrylate), 100 g of vinyl acetate, 1.0 g of octadecyl methacrylate and 385 g of Isopar H were used.
The same operation as in Production Example 1 was performed except that a mixed solution of was used.

The resulting white dispersion had a conversion of 85% and an average particle size of 0.20 μm.
Latex. (Latex particles described in JP-A-60-179751) Production Example 25 of Latex Particles: (Comparative Example B) In Production Example 1 of latex particles D-1, 10 g of dispersion stabilizing resin R-1 having the following structure, The same operation as in Production Example 1 was carried out except that a mixed solution of 100 g of vinyl, 1 g of monomer (I) having the following chemical structure and 385 g of Isopar H was used.

The resulting white dispersion had a conversion of 86% and an average particle size of 0.24 μm.
Latex. (Latex particles described in JP-A-61-63855) Example 1 Dodecyl methacrylate / acrylic acid (copolymerization ratio: 95 /
(5 weight ratio) 10 g of the copolymer, 10 g of nigrosine and 30 g of Shellsol 71 were placed in a paint shaker (Tokyo Seiki Co., Ltd.) together with glass beads and dispersed for 4 hours to obtain a fine dispersion of nigrosine.

30 g of the resin dispersion of Production Example 1 of latex particles, 2.5 g of the above nigrosine dispersion, 15 g of FOC-1400 (tetradecyl alcohol, manufactured by Nissan Chemical Co., Ltd.), and 0.08 of [octadecene-octadecylamide half-maleic acid copolymer] A liquid developer for electrostatography was prepared by diluting it with 1 g of Shellsol 71.

(Comparative Developers A and B) Two kinds of liquid developers A and B for comparison were prepared by replacing the resin dispersion in the above production examples with the following resin particles.

Comparative Liquid Developer A: Resin Dispersion of Production Example 24 of Latex Particles Comparative Liquid Developer B: Resin Dispersion of Production Example 25 of Latex Particles These liquid developers were fully automated plate making machine ELP560 (Fuji Photo Film ( ELP Master II type (manufactured by Fuji Photo Film Co., Ltd.), which is an electrophotographic photosensitive material, was exposed and developed. The plate making speed was 5 plates / min. Further, after the 2,000 sheets of ELP Master II type were processed, it was observed whether or not the toner adhered to the developing device. The blackening rate (image area) of the copied image was determined using a 30% original.

 The results are shown in Table-4.

When plate making was performed using each developer under the above-described plate making conditions, the developer which did not cause staining of the developing device and had a clear image on the 2000th plate making plate was only in the case of the present invention.

On the other hand, a master plate for offset printing (ELP master) obtained by making a plate from each developer is printed by a conventional method, and the number of printed sheets until the occurrence of missing characters or solid blurring in the printed image is compared. As a result, the master plate obtained by using the developer of the present invention did not occur even at 10,000 sheets or more, and the master plate using Comparative Examples A and B
Occurred in about 8000 sheets.

As described above, only the developer using the resin particles of the present invention as a developer did not cause any stain on the developing device, and also significantly improved the number of printed master plates.

In the case of Comparative Example A and Comparative Example B, the plate making conditions are used under severe conditions (conventionally, the blackening rate of a copied image is about 8 to 10% at a plate making speed of 2 to 3 sheets / min). And the developing device (especially on the back electrode plate) becomes dirty.
After the 00 sheets, the quality of the copied image on the plate is affected (Dm
ax decreased, thin lines blurred, etc.).

These results show that the resin particles of the present invention are clearly superior.

Example 2 100 g of the white dispersion obtained in Production Example 2 of latex particles
And 1.5 g of Sumicaron Black were heated to a temperature of 100 ° C. and heated and stirred for 4 hours. After cooling to room temperature, pass through a 300 mesh nylon cloth to remove the remaining dye,
A black resin dispersion having an average particle size of 0.24 μm was obtained.

32 g of the above black resin dispersion, zirconium naphthenate 0.0
A liquid developer was prepared by diluting 5 g of FOC-1600 (hexadecyl alcohol, manufactured by Nissan Chemical Industries, Ltd.) into 1 of Shellsol 71.

When this was developed by the same apparatus as in Example 1, 2000
Even after sheet development, no toner adhesion stains occurred on the apparatus.

Further, the image quality of the obtained master plate for offset printing was clear, and the image quality of the printed matter after printing 10,000 sheets was also very clear.

Example 3 100 g of white dispersion obtained in Production Example 22 of latex particles
And a mixture of 3 g of Victoria Blue B at a temperature of 70 ° C. to 80 ° C.
And stirred for 6 hours. After cooling to room temperature, it was passed through a 200-mesh nylon cloth to remove the remaining dye, and the average particle size was 0.2.
A blue resin dispersion of 23 μm was obtained.

32 g of the above blue resin dispersion, zirconium naphthenate 0.0
A liquid developer was prepared by diluting 5 g to 1 of Isopar H.

This was developed with the same apparatus as in Example 1, and
Even after the development of 00 sheets, no toner adhesion stains were observed on the apparatus. Further, the image quality of the obtained master plate for offset printing was clear, and the image quality of the printed matter after printing 10,000 sheets was also very clear.

Example 4 White resin dispersion 32 obtained in Production Example 6 of latex particles
g, 2.5 g of the nigrosine dispersion obtained in Example 1, FOC-1400
A liquid developer was prepared by diluting 20 g of a tetradecyl alcohol (manufactured by Nissan Chemical Industries, Ltd.) and 0.02 g of a semi-docosanil amidated copolymer of diisobutylene and maleic anhydride into 1 of Isopar G.

When this was developed by the same apparatus as in Example 1, 2000
Even after sheet development, no toner adhesion stains were observed on the apparatus. Further, the image quality of the obtained master plate for offset printing and the image quality of the printed matter after printing 10,000 sheets were clear.

After the developer was allowed to stand for three months, the same treatment as above was performed, but it was not different from that before the lapse of time.

Example 5 10 g of poly (decyl methacrylate) and 3 parts of Isopar H
0 g and 8 g of alkali blue were put into a paint shaker together with glass beads, and dispersed for 2 hours to obtain a fine dispersion of alkali blue.

30 g of the white resin dispersion D-5 obtained in Production Example 5 of latex particles, 4.2 g of the above-mentioned alkali blue dispersion, 15 g of isostearyl alcohol and 0.06 g of a semi-docosanyl amidated copolymer of diisobutylene and maleic anhydride Was diluted to 1 of Isopar G to prepare a liquid developer.

When this was developed by the same apparatus as in Example 1, 2000
Even after sheet development, no toner adhesion stains were observed on the apparatus. In addition, the image quality of the obtained master plate for offset printing and the image quality of printed matter after 10,000 sheets were printed were very clear.

Examples 6 to 11 Liquid developers were prepared in the same manner as in Example 5 except that latex particles D-5 were replaced with the respective latexes shown in Table 5 below.

When this was developed by the same apparatus as in Example 1, 2000
Even after sheet development, no toner adhesion stains occurred on the apparatus.

Further, the image quality of the obtained master plate for offset printing was clear, and the image quality of the printed matter after printing 10,000 sheets was also very clear.

After the developer was allowed to stand for three months, the same treatment as above was performed, but it was not different from that before the lapse of time.

(Effect of the Invention) According to the present invention, a developer having excellent dispersion stability, redispersibility, and fixability was obtained. In particular, even when used under plate-making conditions with extremely high plate-making speed, the developing device did not become stained, and the image quality of the obtained master plate for offset printing and the image quality of the printed matter after 10,000 sheets were printed were very clear. Was.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-96954 (JP, A) JP-A-56-38057 (JP, A) JP-A-60-179951 (JP, A) JP-A 61-96951 63855 (JP, A) JP-A-2-116858 (JP, A) JP-A-2-81054 (JP, A)

Claims (1)

(57) [Claims] An electrophotographic liquid developer comprising at least resin particles dispersed in a non-aqueous solvent having an electric resistance of not less than 10 ⁹ Ωcm and a dielectric constant of not more than 3.5, wherein the dispersed resin particles have the following general formula: A block A containing at least the polymer component represented by (I), a carboxyl group, a sulfo group, a hydroxyl group, a formyl group, an amino group, a phosphono group, and (Q ₀ represents a —Q ₁ group or —OQ ₁ group, and Q ₁ represents a hydrocarbon group.) A polymer component and / or a monofunctional monomer containing at least one polar group selected from And a block B comprising a polymer component corresponding to (A), comprising an AB block copolymer having a weight average molecular weight of 1 × 10 ^{4 to} 5 × 10 ⁵ and soluble in the non-aqueous solvent. In the presence of a dispersion stabilizing resin, a monofunctional monomer (A) which is soluble in the non-aqueous solvent but is insolubilized by polymerization, and the following general formula (II)
A monomer (B) containing an aliphatic group having 8 or more carbon atoms and copolymerizing with the monomer (A) by a polymerization reaction
Is a copolymer resin particle obtained by subjecting a solution containing at least one of the following to a polymerization reaction. General formula (I) Wherein (I), V ₀ is, -COO -, - OCO-, CH 2 l COO-,
CH _{2 l} OCO— or —O— (1 represents an integer of 1 to 3). R ₀ represents an aliphatic group having 10 or more carbon atoms. a ₁ and a _{2, which} may be the same or different, a hydrogen atom, a halogen atom, a cyano group, a hydrocarbon group, -COO-D ₁ or -COO-D ₁ (D ₁ via a hydrocarbon group hydrogen Atom or a hydrocarbon group which may be substituted). General formula (II) In the general formula (II), E ¹ represents an aliphatic group having 8 or more carbon atoms. U is -COO-, -CONH-, (E ² represents an aliphatic group), —OCO—, —CH ₂ COO—, or —O—. e ¹ and e ₂ may be the same or different and each represents a hydrogen atom, an alkyl group, —COOE ³ or —CH ₂ —COOE ³ (E ³ represents an aliphatic group).