JP2916548B2 - Liquid developer for electrostatic photography - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is an electric resistance 10 ⁹ [Omega] cm or more, and relates to an electrostatic photographic liquid developer formed by dispersing at least resin dielectric constant of 3.5 or less of the carrier liquid, especially redispersion And a liquid developer having excellent resist properties.

[0002]

2. Description of the Related Art A general liquid developer for electrophotography uses 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 as a petroleum-based liquid developer. 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. .

[0003] In such a developer, the resin is dispersed as insoluble latex particles in the form of particles having a diameter of several nm to several hundreds nm. It is important that the particles do not agglomerate or precipitate, and if they are not satisfied, it will lead to failure of the developing machine such as poor reproducibility of the image area, contamination of the non-image area, or clogging of the liquid feed pump of the developing device. Would.

[0004] As these improvements, non-aqueous dispersion polymerization methods for obtaining insoluble latex particles having a fine particle size and good monodispersity have been proposed, and various studies have been made.
For example, U.S. Patent Nos. 3,990,980 and 4,61.
8,557, JP-A-1-257969, 2-74
No. 956, No. 1-282566, No. 2-173667
No. 3,12,666, No. 3-15862, etc., a method of improving with a soluble dispersion stabilizing resin is disclosed in U.S. Pat. No. 4,842,975, JP-A No. 62-151868,
JP-A-1-237668, JP-A-2-168276 and the like describe a method of modifying the surface of latex particles by coexisting an insolubilizing monomer and another compound having physicochemical interaction. It is disclosed that the degree of dispersion, particle size, redispersibility, and storage stability can be improved.

[0005]

On the other hand, in recent years, the practical use or development of a direct lithographic printing system to which the electrophotographic technique is applied has been actively performed. These systems are
After a toner image portion is formed on the surface of an electrophotographic photosensitive material by electrophotography, the non-image portion is converted into hydrophilic by processing, thereby obtaining a lithographic printing original plate. As a method for hydrophilizing the non-image portion, a method in which the portion is eluted with a processing solution and the hydrophilicity of the surface of the support of the electrophotographic photosensitive layer is used, or the surface portion of the non-image portion of the photosensitive layer is used. The main method is a method of modifying lipophilicity to hydrophilicity.

In recent years, the latter method has been disclosed in Japanese Patent Application Laid-Open Nos. 62-21669 and 1-19 as improvements of conventionally known methods for desensitizing photoconductive zinc oxide in a photosensitive layer.
No. 1157, No. 2-15277, etc., by converting the binder resin used for the photosensitive layer to hydrophilic by treatment,
It is disclosed that improvement in hydrophilicity is achieved.
In these systems, in the process of making the toner hydrophilic, it is important to maintain the image portion of the toner image portion without any change with respect to the processing liquid (hereinafter, referred to as resist properties for the processing liquid).

When a known liquid developer containing insoluble resin particles having good redispersibility is used for such an electrophotographic plate making system, if the non-image area is sufficiently hydrophilized, the resist property of the toner image area becomes insufficient. However, there was a case where the image part was missing. In particular, this problem is remarkable in a place where the area of the toner image portion such as a thin line, a character, or a halftone dot portion is small, and the printed matter is deteriorated. Insoluble latex particles (for example, styrene-based latex) having high durability with respect to the processing solution have sufficient resist properties, but have poor charge stability and re-dispersibility as toner particles. Fixing of toner particles is inferior and sufficient fixing requires a long time with high heat and a long fixing time.

The present invention solves the above-mentioned problems of the conventional liquid developer. The purpose of the present invention is
An object of the present invention is to provide a liquid developer excellent in dispersion stability, redispersibility, fixing property, and resist property of a hydrophilic treatment liquid in an electrophotographic plate making system. Another object of the present invention is to provide a liquid developer capable of preparing an offset printing original plate excellent in reproducibility of a copied image with respect to an original image by an electrophotographic method. 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. Still another object of the present invention is to provide a liquid developer capable of preparing an original plate for offset printing using a recording method of various recording processes such as ink jet recording, cathode ray tube recording and pressure change or electrostatic change. It is.

[0009]

The above objects of the present invention are:
In a liquid developer for electrophotography comprising at least resin particles dispersed in a non-aqueous solvent having an electric resistance of 10 ⁹ Ωcm or more and a dielectric constant of 3.5 or less, the dispersed resin particles are one of the polymer main chains. Having a weight average molecular weight of 1 × 10 ³ obtained by bonding a polymerizable double bond group represented by the following general formula (I) only to the terminal of
A comb-type copolymer containing at least one kind of macromonomer (M) of at least 1 to 2 × 10 ⁴ as a copolymer component, and a repeating unit of a main chain portion and / or a comb portion of the copolymer represented by the following general formula ( In the presence of a dispersion stabilizing resin [P] which is soluble in the non-aqueous solvent and contains at least the component represented by II), a monofunctional monomer which is soluble in the non-aqueous solvent but insolubilized by polymerization Polymerizing a solution containing at least one of each of the polymer (A) and a polyfunctional monomer (D) having two or more polymerizable functional groups copolymerizable with the monomer (A). This is achieved by a liquid developer for electrophotography, which is a copolymer resin particle obtained by the above method.

[0010]

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In the formula (I), X ⁰ is -COO-, -OCO
_{-, - CH 2 OCO -,} - CH 2 COO -, - O -, -
SO ₂ —, —CO—, —CONR ¹¹ —, —SO ₂ NR ¹¹
- (wherein R ¹¹ represents a hydrogen atom or a hydrocarbon group), or a phenylene group (hereinafter, phenylene group -Ph-, -Ph- is 1,2-phenylene, 1,3-phenylene group And 1,4-phenylene groups). a ¹ and a ² may be the same or different from each other;
A hydrogen atom, a halogen atom, a cyano group, a hydrocarbon group,
-COO-Z ¹ , or -COO-Z via a hydrocarbon group
¹ (here, Z ¹ represents a hydrogen atom or a hydrocarbon group).

[0012]

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In formula (II), X ¹ has the same content as X ⁰ in formula (I). Q ¹ represents an aliphatic group having 6 to 32 carbon atoms. b ¹ and b ² may be the same or different from each other, and represent the same contents as a ¹ and a ² in the formula (I).

[0014] Preferably, the dispersion stabilizing resin [P] used in the present invention has -PO _{3 at} one end of the polymer main chain.
_{H 2, -SO 3 H, -COOH} , -P (= O) (OH)
R ¹ [where R ¹ represents a hydrocarbon group or —OR ² (R ² represents a hydrocarbon group)], —OH, —SH, formyl group, —CONR ³ R ⁴ , —SO ₂ NR ³ R ⁴ [wherein R ³ and R ⁴ each independently represent a hydrogen atom or a hydrocarbon group], a cyclic acid anhydride-containing group, and at least one polar group selected from an amino group. Resin.

More preferably, the dispersion stabilizing resin [P]
Is a resin characterized by containing a polymerizable functional group copolymerizable with the monomer (A) at one end of the polymer main chain.

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,
As the carrier liquid having a dielectric constant of 3.5 or less, preferably, a linear or branched aliphatic hydrocarbon, alicyclic hydrocarbon, or aromatic hydrocarbon, and a halogen-substituted product thereof can be used. For example, octane, isooctane, decane, isodecane, decalin, nonane, dodecane, isododecane, cyclohexane, cyclooctane, cyclodecane, benzene, toluene, xylene, mesitylene, isoper E, isoper G, isoper H, isoper L
(Isoper; trade name of Exxon), Shersol 7
0, Shellsol 71 (Shellsol; trade name of Shell Oil), Amsco OMS, Amsco 460 solvent (Amsco; trade name of Spirits) and the like are used alone or in combination.

The non-aqueous dispersion resin particles (hereinafter sometimes referred to as latex particles), which are the most important components in the present invention, are composed of a non-aqueous solvent containing the macromonomer (M) as a copolymer component. Type copolymer,
Polymerization is carried out by polymerizing at least one monofunctional monomer (A) and at least one polyfunctional monomer (D) in the presence of a dispersion stabilizing resin [P] soluble in the non-aqueous solvent. It is a grain.

Preferably, the dispersion stabilizing resin [P] is
It is a resin containing the specific polar group described above at one end of the polymer main chain. More preferably, the dispersion stabilizing resin [P] is added to the monomer (A) at one end of the polymer main chain.
It is a resin containing a polymerizable functional group that can be copolymerized with.

Here, as the non-aqueous solvent, basically,
Any material can be used as long as it is miscible with the carrier liquid of the liquid developer for electrostatography. That is, the solvent used in 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, isoper E,
Isopar G, Isopar H, Isopar L, Shellsol 70, Shellsol 71, Amsco OMS, Amsco 460 solvent and the like are used alone or in combination.

Solvents that can be used by mixing with these organic solvents include alcohols (eg, methyl alcohol, ethyl alcohol, propyl alcohol, butyl alcohol, fluorinated alcohol, etc.) and ketones (eg, acetone, methyl ethyl ketone, etc.). Carboxylic acid esters (eg, methyl acetate,
Ethyl acetate, propyl acetate, butyl acetate, methyl propionate, ethyl propionate, etc.), ethers (eg, diethyl ether, dipropyl ether, tetrahydrofuran, dioxane, etc.), halogenated hydrocarbons (eg, methylene dichloride, chloroform, Carbon tetrachloride, dichloroethane, methyl chloroform, etc.).

It is desirable that the nonaqueous solvent used by mixing these is distilled off under heating or under reduced pressure after polymerization granulation. However, even if the nonaqueous solvent is brought into the liquid developer as a latex particle dispersion, There is no problem as long as the liquid resistance of the liquid is in a range that can satisfy the condition of 10 ⁹ Ωcm or more. Usually, it is preferable to use the same solvent as the carrier liquid in the step of producing the resin dispersion, and as described above, a linear or branched aliphatic hydrocarbon, alicyclic hydrocarbon, aromatic hydrocarbon, halogenated Hydrocarbons and the like.

The monofunctional monomer (A) in the present invention comprises:
Any monofunctional monomer that is soluble in a nonaqueous solvent but insolubilized by polymerization may be used. Specific examples include a monomer represented by the following general formula (III).

[0023]

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In the formula (III), T ¹ is -COO-, -OCO
_{-, - CH 2 OCO -,} - CH 2 COO -, - O -, -
^{CON (W 1) -, -} SO 2 N (W 1) -, or a phenylene group (-Ph-). W ¹ is a hydrogen atom or an optionally substituted aliphatic group having 1 to 18 carbon atoms (for example, a methyl group, an ethyl group, a propyl group, a butyl group,
Chloroethyl group, 2-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 group, 3-
Methoxypropyl group).

D ¹ is a hydrogen atom or an optionally substituted aliphatic group having 1 to 6 carbon atoms (eg, a methyl group, an ethyl group, a propyl group, a butyl group, a 2-chloroethyl group, a 2,2-dichloroethyl group) 2,2,2-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.).

D ¹ and d ² may be the same or different and each has the same content as a ¹ or a ² in formula (I).

Specific monofunctional monomers (A) include:
For example, vinyl esters or allyl esters of aliphatic carboxylic acids having 1 to 6 carbon atoms (acetic acid, propionic acid, butyric acid, monochloroacetic acid, trifluoropropionic acid, etc.); acrylic acid, methacrylic acid, crotonic acid, itaconic acid, C1-C4 alkyl esters or amides of unsaturated carboxylic acids such as maleic acid (for example, methyl, ethyl, propyl, butyl, 2-chloroethyl, 2-chloroethyl, Bromoethyl group, 2-fluoroethyl 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-
Styrene derivatives (eg, styrene, vinyltoluene, α-methylstyrene,
Vinylnaphthalene, chlorostyrene, dichlorostyrene, bromostyrene, vinylbenzenecarboxylic acid, vinylbenzenesulfonic acid, chloromethylstyrene, hydroxymethylstyrene, methoxymethylstyrene, N, N
-Dimethylaminomethylstyrene, vinylbenzenecarboxamide, vinylbenzenesulfonamide, etc.); unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, maleic acid, and itaconic acid; cyclic acid anhydrides of maleic acid and itaconic acid; Acrylonitrile; Methacrylonitrile; Heterocyclic compound containing a polymerizable double bond group (specifically, for example, “Polymer Data Handbook -Basic Part-”, edited by The Society of Polymer Science, pp. 175-184, Baifukan (1986) ), For example, N-vinylpyridine, N
-Vinylimidazole, N-vinylpyrrolidone, vinylthiophene, vinyltetrahydrofuran, vinyloxazoline, vinylthiazole, N-vinylmorpholine, etc.)
And the like. Two or more monomers (A) may be used in combination.

Next, a monomer (D) having two or more polymerizable functional groups copolymerizable with the monofunctional monomer (A) (hereinafter referred to as a polyfunctional monomer) is used together with the monofunctional monomer (A). Monomer (D)
) Will be described. Multifunctional monomer (D)
The polymerizable functional group contained in may be any as long as it can be copolymerized with the monomer (A), and specific examples include a functional group represented by the following general formula (IV).

[0029]

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[0030] In the formula ^{(IV), d 1, d} 2 and T ¹ have the same meanings as d ^1, d ² and T ¹ in the general formula (III).

The polyfunctional monomer (D) may be a monomer having two or more of the same or different polymerizable functional groups, and the monomer (A) By co-polymerizing, a polymer insoluble in a non-aqueous solvent is formed.

Specific examples of the monomer (D) having two or more polymerizable functional groups include, as monomers having the same polymerizable functional group, styrene derivatives such as divinylbenzene and trivinylbenzene; Polyhydric alcohols (for example, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol # 200, # 40
0, # 600, 1,3-butylene glycol, neopentyl glycol, dipropylene glycol, polypropylene glycol, trimethylolpropane, trimethylolethane, pentaerythritol and the like, or polyhydroxyphenol (for example, hydroquinone, resorcinol, catechol and the like) Methacrylic acid, acrylic acid or crotonic acid esters, vinyl ethers or allyl ethers; dibasic acids (eg, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, maleic acid, phthalic acid) Vinyl esters, allyl esters, vinylamides or allylamides of itaconic acid; polyamines (eg, ethylenediamine, 1,3-propylenediamine, 1,4-butylenediamine, etc.) and vinyl Carboxylic acids having (e.g.,
Condensates with methacrylic acid, acrylic acid, crotonic acid, allyl acetic acid, etc.).

Further, as a monomer having a different polymerizable functional group, for example, a carboxylic acid having a vinyl group [eg,
Methacrylic acid, acrylic acid, methacryloyl acetic acid, acryloyl acetic acid, methacryloyl propionic acid, acryloyl propionic acid, itaconiloyl acetic acid, itaconiloyl propionic acid, a reactant of a carboxylic anhydride with an alcohol or an amine (for example, allyloxycarbonylpropionic acid, Ester derivatives or amide derivatives containing a vinyl group such as oxycarbonylacetic acid, 2-allyloxycarbonylbenzoic acid, allylaminocarbonylpropionic acid, etc. (for example, vinyl methacrylate, vinyl acrylate, vinyl itaconate, allyl methacrylate) , Allyl acrylate, allyl itaconate, vinyl methacryloyl acetate, vinyl methacryloyl propionate,
Allyl methacryloylpropionate, vinyloxycarbonylmethyl methacrylate, vinyloxycarbonylmethyloxycarbonylethylene acrylate, N-allylacrylamide, N-allylmethacrylamide, N-allylitaconamide, allylamide methacryloylpropionate); or And amino alcohols (eg, aminoethanol, 1-aminopropanol, 1-aminobutanol, 1-aminohexanol, 2-aminobutanol, etc.) and carboxylic acids containing vinyl groups.

The monomer (D) having two or more polymerizable functional groups used in the present invention is used in an amount of 20 mol% or less, preferably 10 mol% or less of all monomers, and To form a resin.

The dispersion stabilizing resin [P] of the present invention, which is used to convert a solvent-insoluble polymer produced by polymerizing a monomer in a non-aqueous solvent into a stable resin dispersion, is a polymer. A weight-average molecular weight of 1 × 10 ³ to which the polymerizable double bond group represented by the general formula (I) is bonded to only one end of the main chain.
A comb-type copolymer containing at least one 2 × 10 ⁴ macromonomer (M) as a copolymer component, and a main chain portion and / or a comb portion of the copolymer represented by the general formula (II) ) Containing at least the component represented by
Resin soluble in the non-aqueous solvent.

The dispersion stabilizing resin [P] is represented by the general formula (I) as a repeating unit of the main chain portion and / or the comb portion.
It contains at least one component represented by I). Preferably, both the main chain portion and the comb portion contain the repeating unit represented by the general formula (II). General formula (II)
The proportion of the repeating unit represented by in the dispersion stabilizing resin [P] is determined by the proportion of the repeating unit as a copolymer component other than the macromonomer (M) in the main chain portion and the macromonomer (M) constituting the comb portion. 5 for the total number of repeating units
0-100 wt%, preferably 70-100 wt%
%. If the repeating unit of the general formula (II) is less than 50% by weight, the redispersibility of the resin particles obtained by polymerization granulation decreases, which is not preferable.

The proportion of the macromonomer (M) as a copolymer component of the comb-type copolymer is 5 to 80 wt%, preferably 10 to 60 wt%, based on all components of the dispersion stabilizing resin [P]. %. When the proportion of the macromonomer (M) is less than 5 wt%, the number of comb portions is significantly reduced, and the redispersibility of the resin particles, which is an effect of the present invention, is reduced. On the other hand, the ratio of the macromonomer (M) was 8
If it exceeds 0 wt%, the copolymerizability of the macromonomer (M) and the monomer to be copolymerized at the time of synthesizing the comb copolymer is reduced.

The weight-average molecular weight (hereinafter abbreviated as "Mw") of the dispersion stabilizing resin [P] which is the comb-type copolymer of the present invention is 2 × 10 ⁴ to 1 × 10 ⁶ , preferably 3 × 10 ^4.
10 ^{4 to} 5 × 10 ⁵ . Mw less than 2 × 10 ⁴ or 1
If it exceeds × 10 ⁶ , the redispersibility of the resin particles obtained by polymerization granulation is undesirably reduced. The Mw of the macromonomer (M) is 1 × 10 ³ to 2 × 1
0 is ^4, and preferably from ^{3 × 10 3 ~1 × 10 4} .

Hereinafter, the dispersion stabilizing resin [P] of the present invention will be described in more detail. In the formula (I), X ⁰ represents —CO
O -, - OCO -, - CH 2 OCO -, - CH 2 COO
-, - O -, - SO 2 -, - CO -, - CONR 11 -,
—SO ₂ NR ¹¹ — or —Ph— (where R ^{11 is}
Represents a hydrogen atom or a hydrocarbon group). a ¹ and a ² are
They may be the same or different, and each represents a hydrogen atom, a halogen atom, a cyano group, a hydrocarbon group, -COO-Z ¹ , or -COO-Z ¹ via a hydrocarbon group (here, Z
¹ represents a hydrogen atom or a hydrocarbon group). In the formula (II), X
¹ represents the same content as X ⁰ in the formula (I). Q ¹ represents an aliphatic group having 6 to 32 carbon atoms. b ¹ and b ² may be the same or different from each other, and a ¹ and a ² in the formula (I)
Represents the same content as. In the general formulas (I) and (II), the hydrocarbon group and the aliphatic group may be substituted.

In the general formula (I), R ¹¹ in the substituent represented by X ⁰ is a hydrogen atom, and a preferable hydrocarbon group is an alkyl group having 1 to 22 carbon atoms which may be substituted (for example, Methyl, ethyl, propyl, butyl, heptyl, hexyl, octyl, decyl,
Dodecyl, tridecyl, tetradecyl, hexadecyl, octadecyl, 2-chloroethyl, 2-bromoethyl, 2-cyanoethyl, 2-methoxycarbonylethyl, 2-methoxyethyl, 3-bromopropyl, etc. An alkenyl group having 4 to 18 carbon atoms which may be substituted (for example, a 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, etc.),
An aralkyl group having 7 to 12 carbon atoms which may be substituted (for example, benzyl group, phenethyl group, 3-phenylpropyl group, naphthylmethyl group, 2-naphthylethyl group, chlorobenzyl group, bromobenzyl group, methylbenzyl group, An ethylbenzyl group, a methoxybenzyl group, a dimethylbenzyl group, a dimethoxybenzyl group or the like, an alicyclic group having 5 to 8 carbon atoms which may be substituted (for example, cyclohexyl group,
-Cyclohexylethyl group, 2-cyclopentylethyl group, etc.), an optionally substituted aromatic group having 6 to 12 carbon atoms (for example, phenyl group, naphthyl group, tolyl group, xylyl group, propylphenyl group, butylphenyl group, Octylphenyl, dodecylphenyl, methoxyphenyl, ethoxyphenyl, butoxyphenyl, decyloxyphenyl, chlorophenyl, dichlorophenyl, bromophenyl, cyanophenyl, acetylphenyl, methoxycarbonylphenyl, ethoxycarbonyl Phenyl group, butoxycarbonylphenyl group, acetamidophenyl group, propioamidophenyl group, dodecyloylamidophenyl group, etc.).

When X ⁰ represents -Ph- (phenylene group), the benzene ring may have a substituent. Examples of the substituent include a halogen atom (eg, chlorine atom, bromine atom, etc.), an alkyl group (eg, methyl group, ethyl group, propyl group, butyl group, chloromethyl group, methoxymethyl group, etc.), an alkoxy group (eg, methoxy group, Ethoxy groups,
Propyloxy group, butoxy 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, a bromine atom, a fluorine atom, etc., a cyano group, an alkyl group having 1 to 4 carbon atoms (for example, a methyl group, an ethyl group,
Propyl, butyl, etc.), -COO-Z ¹ , or -COO-Z ¹ via a hydrocarbon group (Z ¹ is preferably a hydrogen atom or an alkyl, alkenyl, or aralkyl group having 1 to 18 carbon atoms) represents an alicyclic group or an aryl group, which may be substituted, specifically, represent represent) the same contents as those described above R ^11. Examples of the hydrocarbon in the —COO—Z ¹ group via the above hydrocarbon group include a methylene group, an ethylene group, and a propylene group.

More preferably, in the general formula (I),
X ⁰ is -COO -, - OCO -, - CH 2 OCO -, -
_{CH 2 COO -, - O -} , - CONH -, - SO 2 NH
-, or represents -Ph-, a ¹ and a ^2, which may be the same or different, each represents a hydrogen atom, a methyl group, -C
OO-Z ^1, or represents a -CH ₂ COO-Z ^1. Here, Z ¹ is more preferably a hydrogen atom or a carbon number of 1-6.
(For example, a methyl group, an ethyl group, a propyl group, a butyl group, a hexyl group, etc.). More preferably, ^one of a ¹ and a ² represents a hydrogen atom.

Specifically, as the polymerizable double bond group represented by the general formula (I), specifically, CH ₂ ＝ CH—COO
_{-, CH 2 = C (CH} 3) -COO-, CH 3 -CH =
_{CH-COO-, CH 2 = C} (CH 2 COOCH 3) -
_{COO-, CH 2 = C (CH} 2 COOH) -COO-,
_{CH 2 = CH-CONH-, CH} 2 = C (CH 3) -C
_{ONH-, CH 3 -CH = CH-} CONH-, CH 2 =
_{CH-OCO-, CH 2 = CH} -CH 2 -OCO-, C
H ₂ ＣＨCH—O—, CH ₂ ＣC (COOH) —CH ₂ —
COO—, CH ₂ ＣC (COOCH ₃ ) —CH ₂ —CO
O—, CH ₂ ＣＨCH—Ph— and the like.

In the general formula (II), b ¹ and b ² are
They may be the same or different from each other, and a ¹ , a
Represents the same content as ² . Preferred examples of b ¹ and b ² are the same as the preferred examples of a ¹ and a ^{2 in} the formula (I). X ¹
Represents the same content as X ⁰ in formula (I), and preferably represents —COO—, —OCO—, —O—, —CH ₂ OCO
-, or represents a -CH ₂ COO-. Q ¹ has 6 or more carbon atoms
Represents an aliphatic group of 32, and preferably has 8 to 22 carbon atoms.
Represents an alkyl group or an alkenyl group, for example, octyl group, decyl group, dodecyl group, tridecyl group, tetradecyl group, hexadecyl group, octadecyl group, docosanyl group, eicosanyl group, octenyl group, decenyl group,
Dodecenyl, tridecenyl, tetradecenyl, hexadecenyl, octadecenyl, linoleyl, docosenyl and the like.

The repeating unit of the main chain portion and the comb portion of the dispersion stabilizing resin [P] of the present invention may contain other repeating units in addition to the repeating unit represented by the general formula (II). Other repeating units include those represented by the above general formula (II)
The repeating unit is not particularly limited as long as it is a repeating unit composed of another monomer copolymerizable with the monomer corresponding to the repeating unit represented by. The other copolymerizable monomer may be any as long as it contains a polymerizable double bond group.
Unsaturated carboxylic acids such as acrylic acid, methacrylic acid, crotonic acid, and itaconic acid; ester or amide derivatives of unsaturated carboxylic acids having 6 or less carbon atoms; vinyl esters or allyl esters of carboxylic acids; styrenes; Nitrile; acrylonitrile; a heterocyclic compound containing a polymerizable double bond group, and the like. More specifically, a compound having the same content as the monomer (A) to be insolubilized is mentioned.

The macromonomer (M) of the present invention can be produced by a conventionally known synthesis method. For example,
A method by an ionic polymerization method in which various reagents are reacted with a terminal of a living polymer obtained by anionic polymerization or cationic polymerization to form a macromer, in a molecule,
Using a polymerization initiator and / or a chain transfer agent containing a reactive group such as a carboxyl group, a hydroxy group, and an amino group,
A radical polymerization method in which an oligomer having a terminal reactive group bond obtained by radical polymerization is reacted with various reagents to give a macromer, and an oligomer obtained by polyaddition or polycondensation reaction are produced in the same manner as the above radical polymerization method. And a method based on a polyaddition condensation method for introducing a polymerizable double bond group. Specifically, P.S. Dreyfus
s & R. P. Quirk, Encycl. Poly
m. Sci. Eng. , 7 , 551 (1987);
F. Rempp & E. Franta, Adv. Po
lym. Sci. 58 , 1 (1984); Per
Sec, Appl. Polym. Sci. , 285 , 9
5 (1984); Asami, M .; TakaRi,
Makvamol. Chem. Suppl. , 12 , 1
63 (1985); Rempp et al, Ma
kvamol. Chem. Suppl. , 8 , 3 (19
84), Yusuke Kawakami "Chemical Industry" 38 , 56 (198)
7), Yuya Yamashita "Polymer" 31 , 988 (1982),
Shiro Kobayashi "Polymer" 30 , 625 (1981), Toshinobu Higashimura "Journal of the Adhesion Society of Japan" 18 , 536 (1982), Koichi Ito "Polymer Processing" 35 , 262 (1986), Kishiro Higashi, Takashi Tsuda " Functional Materials " 1987 , No. It can be synthesized according to the methods described in reviews such as 10, 5 and literatures and patents cited therein.

Examples of the polymerization initiator containing a reactive group in the molecule include, for example, 4,4'-azobis (4-cyanovaleric acid) and 4,4'-azobis (4-cyanovaleric chloride). , 2,2'-azobis (2-cyanopropanol), 2,2'-azobis (2-cyanopentanol), 2,2'-azobis [2- (5-hydroxy-
3,4,5,6-tetrahydropyrimidin-2-yl)
Propane], 2,2'-azobis {2-methyl-N-
[1,1-bis (hydroxymethyl) -2-hydroxyethyl] propioamide}, 2,2'-azobis {2-
Methyl-N- [1,1-bis (hydroxymethyl) ethyl] propioamide {, 2,2′-azobis [2-methyl-N- (2-hydroxyethyl) propioamide],
2,2'-azobis (2-amidinopropane), 2,
2'-azobis [2-methyl-N- (2-hydroxyethyl) -propioamide], 2,2'-azobis [2-
(5-methyl-2-imidazolin-2-yl) propane], 2,2'-azobis [2- (4,5,6,7-tetrahydro-1H-1,3-diazepin-2-yl) propane] , 2,2'-azobis [2- (3,4,5,6
-Tetrahydropyrimidin-2-yl) propane],
2,2′-azobis {2- [1- (2-hydroxyethyl) -2-imidazolin-2-yl] propane}, 2,
2'-azobis [N- (2-hydroxyethyl) -2-
Azobis compounds such as methyl-propionamidine] and 2,2'-azobis [N- (4-aminophenyl) -2-methylpropionamidine].

Examples of the chain transfer agent having a reactive group in the molecule include, for example, the reactive group or a mercapto compound containing a substituent capable of being induced to the reactive group (eg, thioglycolic acid, thiomalic acid) , Thiosalicylic acid, 2-
Mercaptopropionic acid, 3-mercaptopropionic acid, 3-mercaptobutyric acid, N- (2-mercaptopropionyl) glycine, 2-mercaptonicotinic acid, 3-mercaptonicotinic acid
[N- (2-mercaptoethyl) carbamoyl] propionic acid, 3- [N- (2-mercaptoethyl) amino]
Propionic acid, N- (3-mercaptopropionyl) alanine, 2-mercaptoethanesulfonic acid, 3-mercaptopropanesulfonic acid, 4-mercaptobutanesulfonic acid, 2-mercaptoethanol, 3-mercapto-
1,2-propanediol, 1-mercapto-2-propanol, 3-mercapto-2-butanol, mercaptophenol, 2-mercaptoethylamine, 2-mercaptoimidazole, 2-mercapto-3-pyridinol, or the reactivity thereof Group or a substituent-containing iodinated alkyl compound which can be derived to the reactive group (for example, iodoacetic acid, iodopropionic acid, 2-iodoethanol,
2-iodoethanesulfonic acid, 3-iodopropanesulfonic acid, etc.). Preferably, a mercapto compound is used. The amount of the chain transfer agent or the polymerization initiator to be used is 0.1 to 10 parts by weight, preferably 0.5 to 5 parts by weight, based on 100 parts by weight of all monomers.

The dispersion stabilizing resin polymer [P] used in the present invention is specifically prepared by a known method represented by the general formula (I)
It is simple to carry out a method of polymerizing with a polymerization initiator (for example, an azobis compound, a peroxide or the like) in the presence of at least a monomer corresponding to the repeating unit represented by I) and the macromonomer (M) described above. ,preferable. The polymerization initiator used here is 0.5 to 15 parts by weight per 100 parts by weight of the total amount of the total monomers and the total macromonomer, preferably 1 to 10 parts by weight.

The dispersion stabilizing resin [P] to be used in the present invention is preferably a resin obtained by bonding a specific polar group to one end of the polymer main chain. [Hereinafter, it is referred to as dispersion stabilizing resin [PA] or resin [PA]. ] The specific polar _{group, -PO 3 H 2, -SO 3} H, -COO
H, -P (= O) ( OH) R 1 [wherein R ¹ represents a hydrocarbon group or -OR ² (R ² represents a hydrocarbon group)], -OH, -SH, formyl group, - CONR
³ R ⁴ , —SO ₂ NR ³ R ⁴ [where R ³ and R
⁴ independently represent a hydrogen atom or a hydrocarbon group], a cyclic acid anhydride-containing group, and at least one polar group selected from amino groups.

In the polar group represented by -P (= O) (OH) R ¹ , the hydrocarbon group represented by R ¹ or R ² is preferably a hydrocarbon group having 1 to 10 carbon atoms.
More preferably, an aliphatic group having 1 to 8 carbon atoms which may be substituted (for example, methyl, ethyl, propyl, butyl, pentyl, hexyl, butenyl, pentenyl, hexenyl, 2-chloroethyl) A 2-cyanoethyl group, a cyclopentyl group, a cyclohexyl group, a benzyl group, a phenethyl group, a chlorobenzyl group, a bromobenzyl group, etc., or an aromatic group which may be substituted (for example, a phenyl group, a tolyl group, a xylyl group, Mesityl group, chlorophenyl group, bromophenyl group, methoxyphenyl group,
A cyanophenyl group).

The above -CONR ³ R ⁴ and -SO ₂ NR
^{In the} polar group represented by ³ R ⁴ , R ³ and R ⁴ each independently represent a hydrogen atom or a hydrocarbon group (preferably a hydrocarbon group having 1 to 8 carbon atoms which may be substituted).
Specific examples of the hydrocarbon group represented by R ³ and R ⁴ include those having the same contents as the hydrocarbon group represented by R ¹ and R ² .

The cyclic acid anhydride-containing group is a group containing at least one cyclic acid anhydride. Examples of the cyclic acid anhydride include aliphatic dicarboxylic anhydride and aromatic dicarboxylic anhydride. Things. Examples of the aliphatic dicarboxylic anhydride include succinic anhydride, glutaconic anhydride, maleic anhydride, cyclopentane-1,2
-Dicarboxylic anhydride, cyclohexane-1,2-dicarboxylic anhydride, cyclohexene-1,2-dicarboxylic anhydride, 2,3-bicyclo [2,2,2] octanedicarboxylic anhydride, and the like, These aliphatic dicarboxylic anhydrides may be substituted with, for example, a halogen atom such as a chlorine atom or a bromine atom, or an alkyl group such as a methyl group, an ethyl group, a butyl group or a hexyl group. Examples of the aromatic dicarboxylic anhydride include phthalic anhydride, naphthalene-dicarboxylic anhydride, pyridine-dicarboxylic anhydride, thiophene-dicarboxylic anhydride and the like. The product is, for example, a chlorine atom, a halogen atom such as a bromine atom, an alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, a hydroxyl group, a cyano group, a nitro group, an alkoxycarbonyl group (as an alkoxy group, For example, it may be substituted with a methoxy group, an ethoxy group and the like.

In the polar group of the present invention, the amino group is -N
Represents H ₂ , —NHR ⁵ or —NR ⁵ R ⁶ . R ⁵ , R ⁶
Represents a hydrocarbon group having 1 to 8 carbon atoms, and preferably represents a hydrocarbon group having 1 to 7 carbon atoms.
Those having the same contents as the hydrocarbon group represented by ¹ can be mentioned.

In the dispersion stabilizing resin [PA], at least one of the above-mentioned specific polar groups may be directly bonded to one end of the polymer main chain, or may be bonded via a linking group. Examples of a linking group for linking the main chain component and a specific polar group-containing component include a carbon-carbon bond (single bond or double bond) and a carbon-hetero atom bond (hetero atoms include, for example, an oxygen atom, a sulfur atom, Nitrogen atom, silicon atom, etc.) and any combination of heteroatom-heteroatom bond atomic groups. Further specific examples of the linking group include —CR ⁷ R ⁸ — wherein R ⁷ and R ⁸ are each independently a hydrogen atom, a halogen atom (such as a fluorine atom, a chlorine atom, or a bromine atom), a cyano group, hydroxyl group, an alkyl group (methyl group, ethyl group, propyl group, etc.) indicating the like], - (CH = CH) - , - C 6 H 10 - ( i.e., cyclohexylene), - Ph -, - O- , -S-, -CO
^{-, - NR 9 -, -} COO -, - SO 2 -, - CONR
_{^{9 -, - SO 2 NR 9}} -, - NHCOO -, - NHCO
An atom such as NH—, —Si R ⁹ R ¹⁰ —, wherein R ⁹ and R ¹⁰ each independently represent a hydrogen atom, a hydrocarbon group representing the same content as R ¹ in the polar group, etc. And a single linking group selected from the group or a linking group composed of a combination of any two or more atomic groups.

The resin polymer [PA] for dispersion stabilization used in the present invention is, specifically, a monomer corresponding to the repeating unit represented by the general formula (II), the above-mentioned macromonomer (M), A method of polymerizing a mixture of the above-mentioned chain transfer agent containing a specific polar group with a polymerization initiator (for example, an azobis compound, a peroxide or the like) or containing the polar group without using the above chain transfer agent A method of polymerizing using a polymerization initiator, or a method using a compound containing the polar group, for both the chain transfer agent and the polymerization initiator,
Further, in the above three methods, as a substituent of the chain transfer agent or the polymerization initiator, an amino group, a halogen atom,
After a polymerization reaction using a compound containing an epoxy group, an acid halide group, or the like, the compound can be produced by a method of introducing the polar group by reacting with a functional group by a polymer reaction. Specifically, P.S. Dreyfuss
& R. P. Quirk, Encycl. Polym.
Sci. Eng. , 7 , 551 (1987), Yoshiki Chujo, Yuya Yamashita "Dyes and Chemicals" 30 , 232 (198)
5), Akira Ueda, Susumu Nagai "Science and Industry" 60 , 57 (19)
86) and the methods described in the references cited therein.

Specific examples of the above-mentioned chain transfer agent containing a specific polar group or a substituent capable of deriving to the polar group include mercapto described above as the reactive group-containing chain transfer agent in the method for synthesizing the macromonomer (M). And iodide alkyl compounds. Preferably, a mercapto compound is used. Further, the above-mentioned azobis-based compound as a polymerization initiator containing a reactive group in the macromonomer (M) is also used as the polymerization initiator containing a specific polar group or a substituent which can be induced to the polar group. The amount of these chain transfer agents or polymerization initiators to be used is 0.1 to 10 parts by weight, preferably 0.1 to 10 parts by weight, based on 100 parts by weight of the total amount of all monomers and all macromonomers (M). 5 to 5 parts by weight.

More preferably, as the dispersion stabilizing resin [P] used in the present invention, a polymerizable functional group copolymerizable with the monomer (A) is bonded to one end of the polymer main chain. What is. [Hereinafter referred to as dispersion stabilizing resin [PB] or resin [PB]. ]

The specific contents of the polymerizable functional group of the dispersion stabilizing resin [PB] include the functional group represented by the general formula (IV) described as the polymerizable functional group in the polyfunctional monomer (D). And the same. Further, the polymerizable functional group may be directly bonded to one end of the polymer main chain, or may be bonded via a linking group. Examples of the linking group include those having the same contents as the linking group in the dispersion stabilizing resin [PA].

Further, in a preferred embodiment, the dispersion stabilizing resin [PB] of the present invention comprising a polymerizable functional group bonded to one end of the polymer main chain is obtained by conventionally known anionic or cationic polymerization. either reacting a reagent containing various polymerizable double bond group at the end of the living polymer, or a specific reactive group at the end of the living polymer (e.g., -OH, -COOH, -SO ₃ H,
_{-SH, -NH 2, -PO 3 H} 2, -NCO, -NC
S, an epoxy group represented by the following formula 7, -COCl, -S
O ₂ Cl), and then reacting with a reagent containing a polymerizable double bond group by a polymer reaction (method by ionic polymerization), or containing the above specific reactive group in the molecule. After radical polymerization using the polymerization initiator and / or chain transfer agent, a polymerizable reaction is carried out using a specific reactive group bonded only to one end of the polymer main chain, thereby obtaining a polymerizable double. It can be easily produced by a synthesis method such as a method of introducing a bonding group.

[0062]

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Specifically, P. Dreyfuss &
R. P. Quirk, Encycl. Poly. Sc
i. Eng. , 7 , 551 (1987), Yoshiki Chujo, Yuya Yamashita, "Dyes and Chemicals", 30 , 232 (1985), Akira Ueda, Susumu Nagai, "Chemistry and Industry" 60 , 57 (1986),
P. F. Rempp & E. Franta, Adva
nces in Polymer Science, 5
8 , 1 (1984), Koichi Ito "Polymer processing", 35 ,
262 (1986); Persec, Applie
d Polymer Science, 285 , 97
(1984), and a polymerizable double bond group can be introduced according to the method described in the literature and the like cited therein.

More specifically, a dispersion stabilizing resin [PA
The method of introducing a polymerizable double bond group by carrying out a polymer reaction using the specific polar group of the above [1] is preferable.

Dispersion stabilizing resin [P] used in the present invention
Is soluble in an organic solvent, and more specifically, it is sufficient that at least 5 parts by weight or more of the resin for dispersion stabilization is dissolved at 25 ° C. with respect to 100 parts by weight of a toluene solvent.

In order to produce the latex particles used in the present invention, generally, the dispersion stabilizing resin [P] as described above,
Thermal polymerization of the monofunctional monomer (A) and the polyfunctional monomer (D) in a non-aqueous solvent in the presence of a polymerization initiator such as benzoyl peroxide, azobisisobutyronitrile, and butyllithium. It should be done. Specifically, a method of adding a polymerization initiator to a mixed solution of the dispersion stabilizing resin [P], the monomer (A) and the monomer (D), and a solution in which the dispersion stabilizing resin [P] is dissolved A method in which the monomer (A) and the monomer (D) are added dropwise together with the polymerization initiator, or the total amount of the dispersion stabilizing resin [P] and the monomer (A) and the monomer (D) A method of optionally adding the remaining monomer (A) and monomer (D) together with a polymerization initiator to a solution containing a part of the resin, and further, dispersing a dispersion stabilizing resin [P ], A method of optionally adding a mixed solution of the monomer (A) and the monomer (D) together with the polymerization initiator, and the like. Any of these methods can be used.

The total amount of the monomers (A) and (D) is
The amount is about 5 to 80 parts by weight, preferably 10 to 50 parts by weight, based on 100 parts by weight of the nonaqueous solvent. The soluble resin as the dispersion stabilizing resin [P] is used in an amount of 1 to 100 parts by weight, preferably 10 to 50 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 120 ° C.
° C. The reaction time is preferably 1 to 15 hours.

When the above-mentioned polar solvents such as alcohols, ketones, ethers and esters are used in combination with the non-aqueous solvent used in the reaction, or when the monomer (A) or monomer When the unreacted product of the compound (D) remains, the solvent or the monomer (A) or the monomer (A) is removed by heating to a boiling point or higher or by distillation under reduced pressure. Is preferred.

The non-aqueous latex particles produced as described above exist as fine particles having a uniform particle size distribution, and at the same time, exhibit extremely stable dispersibility. However, it has good dispersibility and does not show any aggregation or precipitation in the developing device. Further, when fixed by heating or the like, a strong film was formed, and excellent fixability was exhibited. Further, when the liquid developer of the present invention is used in a plate making system,
The toner image portion had excellent resist properties even after the non-image portion hydrophilizing step, and showed excellent original image reproducibility of the printed image portion.

The liquid developer of the present invention having the above effects is made possible by the insoluble latex particles provided by the present invention. That is, the dispersed resin particles of the present invention,
The dispersion stabilizing resin [P] interacts with the insoluble resin particles and is adsorbed on the insoluble resin particles. Since the resin [P] adsorbed on the resin particles is soluble in the non-aqueous solvent, the resin [P] has a so-called steric repulsion effect which is known as stabilization of dispersion of the non-aqueous latex. At the same time, since the resin [P] is a soluble resin containing a comb-type structure, the affinity for a non-aqueous solvent is significantly improved, and the adsorbed resin [P] has a comb-type structure, so that the resin [P] is in the vicinity of the particle interface. It is presumed that this improves the amphiphilicity near the particle interface. It is considered that these factors suppress the aggregation and precipitation of the insoluble particles and significantly improve the redispersibility.

In the present invention, when a dispersion stabilizing resin [PA] containing a specific polar group at at least one end of the polymer main chain, which is a preferred embodiment, the interaction with the insoluble resin particles is reduced. It is considered that the effect of the above-mentioned dispersion stabilization is further improved by further improving the adsorption property to the particles.

In a further preferred embodiment, a dispersion stabilizing resin [PB comprising a polymerizable functional group at one end of the polymer main chain]
Is used, it is copolymerized with the monomers (A) and (D) which are insolubilized during the dispersion polymerization reaction, and is more efficiently bonded to the insoluble resin particles.

As described above, by using the dispersion stabilizing resin [P] of the present invention, the dispersion stability can be improved.
When the resin [PA] or the resin [PB] is used, the same or more effect can be obtained even if the amount used is reduced. On the other hand, in the case of the resin [PA] or the resin [PB], the stabilization of the dispersion can be achieved with a small amount of use, and the resin [P] not adsorbed on the particles is reduced. These are concentrated in the developer when the liquid developer is repeatedly used for a long period of time, and the fear of causing various problems has been improved.

On the other hand, the insoluble resin particles of the present invention are characterized in that the particles form a crosslinked structure by polymerization and granulation using a polyfunctional monomer (D). This allows
After forming an image as toner particles, even after going through a hydrophilization treatment step to make a printing original plate, the suitability of the processing liquid (resist property) is improved, and damage to the toner image area can be significantly reduced. Was. Further, in order to ease the fixing conditions, it is important for the apparatus to have a resin structure having a low glass transition point as the insoluble resin particles, and these resins having a low glass transition point include, for example, an ester structure, Since a polar structure such as an ether structure or an amide structure is contained, the compound is easily dissolved in a treatment liquid in the hydrophilic treatment step, and as a result, the resist property of the toner portion on the image portion is reduced. This undesirable phenomenon can be significantly suppressed by partially crosslinking the inside of the resin particles. The dispersed resin particles of the present invention bring about the effects of the present invention by these effects.

In the liquid developer of the present invention, a coloring agent may be used if desired. 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,
And phthalocyanine blue. 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, another method is disclosed in
As disclosed in JP-A-54029, there is a method in which a dispersing resin and a dye are chemically bonded, or as described in JP-B-44-22955, etc. In addition, there is a method of using a monomer containing a dye in advance to obtain a dye-containing copolymer.

Various additives may be added to the liquid developer of the present invention, if desired, for the purpose of enhancing the charging characteristics or improving the image characteristics. For example, Yuji Harazaki “Electrophotography”, Vol. What is specifically described in No. 2, p. 44 is used. For example, a copolymer containing a metal salt of di-2-ethylhexyl sulfosuccinic acid, a metal salt of naphthenic acid, a metal salt of a higher fatty acid, lecithin, poly (vinylpyrrolidone), and a hemimaleamide component;
Examples include polyethers and waxes. But,
It is not limited to these.

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 used as desired) are used in an amount of 0.5 parts by weight to 1000 parts by weight of the carrier liquid.
50 parts by weight are preferred. If the amount is less than 0.5 parts by weight, the image density becomes insufficient, and if it exceeds 50 parts by weight, fogging to a non-image portion is apt to occur. Further, the carrier liquid soluble resin for dispersion stabilization is also used as needed, and can be added in an amount of about 0.5 to 100 parts by weight based on 1000 parts by weight of the carrier liquid. The charge control agent as described above is a carrier liquid 100
0.001 part by weight to 1.0 part by weight based on 0 part by weight is preferred. 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, if the electric resistance of the liquid developer from which the toner particles have been removed is lower than 10 ⁹ Ωcm, it becomes difficult to obtain a high-quality continuous tone image. Therefore, the amount of each additive is controlled within this limit. It is necessary.

[0078]

EXAMPLES The production examples of the dispersion stabilizing resin of the present invention, the production examples of latex particles and the examples are shown below, and the effects of the present invention will be described in more detail. However, the present invention is not limited to these examples. Absent.

Production Example 1 of Macromonomer (M) Macromonomer M-1 A mixed solution of 100 g of methyl methacrylate, 5 g of mercaptopropionic acid and 200 g of toluene was heated to a temperature of 75 ° C. while stirring under a nitrogen stream. 1.0 g of 2,2'-azobisisobutyronitrile (abbreviated as AIBN) was added, and the mixture was reacted for 4 hours. I. B. N. Was added for 3 hours, and A. I. B. N. 0.3 g
The reaction was performed for 3 hours. Next, 8 g of glycidyl methacrylate, 1.0 g of N, N-dimethyldodecylamine and 0.5 g of t-butylhydroquinone were added to the reaction solution, and the mixture was stirred at a temperature of 100 ° C. for 12 hours. After cooling, the reaction solution was reprecipitated in 2 liters of methanol to obtain 82 g of a white powder. The weight average molecular weight of the polymer was 6,500.

[0080]

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Production Examples 2 to 27 of Macromonomer (M)
Macromonomer M-2 to M-27 The reaction was performed in the same manner as in Production Example 1 except that only methyl methacrylate was replaced with a compound corresponding to Table A below in Production Example 1 of the macromonomer, and the macromonomers M-2 to M-27 were reacted. M
-27 was synthesized. The weight average molecular weight of each obtained macromonomer was in the range of 5,000 to 7000.

[0082]

[Table 1]

[0083]

[Table 2]

[0084]

[Table 3]

Production Example 28 of Macromonomer (M): Macromonomer M-28 90 g of dodecyl methacrylate, 10 g of methacrylic acid,
A mixed solution of 5 g of thioethanol and 200 g of toluene was heated to a temperature of 70 ° C. while stirring under a nitrogen stream. A.
I. B. N. Was added and reacted for 4 hours. Furthermore,
A. I. B. N. Was added for 3 hours, and then A. I. B. N. Was added and reacted for 3 hours. The reaction solution was cooled to room temperature, 18.2 g of 2-carboxyethyl methacrylate was added, and a mixed solution of 24 g of dicyclohexylcarbodiimide (abbreviated as DCC) and 150 g of methylene chloride was added dropwise over 1 hour. t-
1.0 g of butyl hydroquinone was added, and the mixture was stirred for 4 hours. The filtrate obtained by filtering the precipitated crystals was reprecipitated in 2 liters of methanol. The precipitated oil was collected by decantation, dissolved in 150 ml of methylene chloride, and re-precipitated in 1 liter of methanol. The oily substance was collected and dried under reduced pressure to obtain a polymer having a weight average molecular weight of 5,800 in a yield of 54 g.

[0086]

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Production Examples of Macromonomer (M) 29 to 3
5: Macromonomer M-29 to M-35 In the production example of macromonomer M-28, M-methacrylate monomer (corresponding to dodecyl methacrylate) and unsaturated carboxylic acid (corresponding to 2-carboxyethyl methacrylate) were replaced with M- In the same manner as in Production Example 28, the macromonomers shown in Table B below were produced. The weight average molecular weight of each obtained macromonomer is 5,000 to 70.
00.

[0088]

[Table 4]

[0089]

[Table 5]

Preparation Example 36 of Macromonomer (M): Macromonomer M-36 A mixed solution of 70 g of n-dodecyl methacrylate, 30 g of t-butyl methacrylate, 4 g of 2-mercaptoethylamine and 200 g of tetrahydrofuran was added to a temperature of 70 ° C. under a nitrogen stream. Warmed. A. I. B. N. Was added and reacted for 4 hours. I. B. N. 0.5 g
Reacted for hours. Next, the reaction solution was cooled in a water bath to a temperature of 20 ° C., 6.5 g of triethylamine was added, and 5.6 g of acrylic acid chloride was added dropwise with stirring at a temperature of 25 ° C. or lower. After the addition, the mixture was further stirred for 1 hour. Thereafter, 0.5 g of t-butylhydroquinone was added, and the temperature was adjusted to 60.
C. and stirred for 4 hours. After cooling, reprecipitation in 2 liters of methanol was performed twice to obtain a pale yellow viscous material 6.
3 g were obtained. The weight average molecular weight was 6,600.

[0091]

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Preparation Example 37 of Macromonomer (M) Macromonomer M-37 A mixed solution of 100 g of octadecyl methacrylate, 150 g of tetrahydrofuran and 50 g of isopropyl alcohol was heated to a temperature of 75 ° C. under a nitrogen stream. 4,4 '
-Azobis (4-cyanovaleric acid) (abbreviation: A.C.
V. ) Was added and reacted for 5 hours. C. V.
Was added and reacted for 4 hours. After cooling, the reaction solution was reprecipitated in 1.5 liters of methanol, and the oil was collected by decantation and dried under reduced pressure. The yield was 85 g. 50 g of the obtained oil (oligomer), 15 g of glycidyl methacrylate, 1.0 g of N, N-dimethyldodecylamine and 2,2'-methylenebis (6-t
-Butyl-p-cresol) at a temperature of 10
Stirred at 0 ° C. for 15 hours. After cooling, the reaction solution was reprecipitated in 1 liter of petroleum ether to obtain 42 g of a white powder. The weight average molecular weight was 7,500.

[0093]

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Preparation Example 38 of Macromonomer (M): Macromonomer M-38 In Preparation Example 37 of Macromonomer, 50 g of the obtained intermediate oligomer, 2.8 g of 2-hydroxyethyl methacrylate and 100 g of methylene chloride were mixed. The solution was added with stirring at room temperature. C. C. , 4.0 g of 4-dimethylaminopyridine and 10 g of methylene chloride were added dropwise over 1 hour. The mixture was further stirred for 4 hours. The precipitated crystals were separated by filtration, the operation of reprecipitating the filtrate in 1 liter of methanol was performed twice, and the obtained powder was dried under reduced pressure. The yield was 43 g and the weight average molecular weight was 7,30.
It was 0.

[0095]

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Production Example 1 of Resin for Stabilizing Dispersion [P]: Resin P
-1 Octadecyl methacrylate 70 g, macromonomer M
A mixed solution of 30 g of -1 and 200 g of toluene was heated to a temperature of 85 ° C. while stirring under a nitrogen stream. 2,2'-
Azobis (isobutyronitrile) (abbreviated as AIB)
N. ) Was added and reacted for 4 hours. Further, A. I.
B. N. Was added and reacted for 2 hours. I.
B. N. Was added and reacted for 2 hours. After cooling, the mixed solution was reprecipitated in 1.5 l of methanol, and the powder was collected by filtration and dried to obtain 88 g of a white powder. The weight average molecular weight (abbreviated as Mw) of the obtained polymer is 4.5.
× 10 ⁴ .

Production Examples 2 to 14 of dispersion stabilizing resin [P]:
Resins P-2 to P-14 In Production Example 1 of dispersion stabilizing resin [P], the monomers of Table C below and macromonomer (M) were used instead of octadecyl methacrylate and macromonomer M-1, respectively. Each dispersion stabilizing resin was produced in exactly the same manner as in Production Example 1. Mw of each resin is 4.0 × 10 ^{4 to} 6 × 10 ⁴
Met.

[0098]

[Table 6]

Preparation Example of Dispersion Stabilizing Resin [PA] 1: Resin PA-1 80 g of octadecyl methacrylate, macromonomer M
A mixed solution of 20 g of -1 and 150 g of toluene was heated to a temperature of 75 ° C. while stirring under a nitrogen stream. A. C.
V. Was added and reacted for 4 hours. C. V. Was added for 2 hours. C. V. Was added and reacted for 3 hours. After cooling, the precipitate was reprecipitated in 2 liters of methanol, collected by filtration and dried to obtain 76 g of a white powder. Mw
Was 4.8 × 10 ⁴ .

[0100]

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Production Examples 2-1 of Dispersion Stabilizing Resin [PA]
5: Resin PA-2 to PA-15 The reaction was carried out in the same manner as in Production Example 1 except that octadecyl methacrylate and macromonomer M-1 were replaced with the compounds shown in Table D below in Production Example 1 of Resin PA-1. The respective dispersion stabilizing resins were produced. Mw of each resin is 3.5 × 10 ⁴ or more.
It was 5.0 × 10 ⁴ .

[0102]

[Table 7]

[0103]

[Table 8]

Production Example 16 of Dispersion Stabilizing Resin [PA] Resin PA-16 70 g of octadecyl methacrylate, macromonomer M
-10, 30 g, thiomalic acid 0.8 g, toluene 10
0 g and a mixed solution of 50 g of isopropyl alcohol,
The mixture was heated to a temperature of 80 ° C. under a nitrogen stream. 1,1′-azobis (cyclohexane-1-carbocyanide) (abbreviation: A.
B. C. C. ) Was added and reacted for 4 hours.
B. C. C. Was added for 3 hours. B.
C. C. Was added and reacted for 4 hours. After cooling, the precipitate was reprecipitated in 2 liters of methanol, collected by filtration and dried to obtain 78 g of a white powder. Mw of the obtained resin is 3.8 × 10
^{Was 4} .

[0105]

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Production Examples of Dispersion Stabilizing Resin [PA] 17-2
5: Resin PA-17 to PA-25 In Production Example 16 of Resin PA-16, octadecyl methacrylate, macromonomer M-10 and mercapto compound (thiomalic acid) were each replaced with a compound corresponding to Table E below, and the production example was changed. Reaction with each resin PA
-17 to PA-25. Mw of each resin is 3.0
× 10 ⁴ to 4 × 10 ⁴ .

[0107]

[Table 9]

[0108]

[Table 10]

Production Examples 26 to 3 of Dispersion Stabilizing Resin [PA]
1: Resin PA-26 to PA-31 In Production Example 1 of resin PA-1, polymer initiator A.
C. V. Was replaced with each of the resins PA-26 to PA-A in the same manner as in Production Example 1 except that the azobis compound shown in Table F below was used.
-31 was produced. The Mw of each resin obtained was 3.0 × 1
0 ^{4 to} 6 × 10 ⁴ .

[0110]

[Table 11]

Preparation Example 32 of Dispersion Stabilizing Resin [PA] Resin PA-32 85 g of n-dodecyl methacrylate, macromonomer M
A mixed solution of -28 (15 g) and toluene (150 g) was heated to a temperature of 75 ° C under a nitrogen stream. A. C. V. Was added for 4 hours, and A. C. V. Was added and reacted for 3 hours. Further, A. C. V. Was added, and the mixture was heated to a temperature of 90 ° C. and reacted for 2 hours. After cooling, the reaction product was reprecipitated in 2 liters of methanol, and the precipitated viscous substance was collected by decantation and dried under reduced pressure.
The yield of the transparent viscous material was 76 g, and the weight average molecular weight was Mw.
Was 4.3 × 10 ⁴ .

[0112]

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Production Example 1 of Dispersion Stabilizing Resin [PB] Resin PB -1 Resin PA synthesized in Production Example 1 of Dispersion Stabilizing Resin [PA]
-1 was stirred at a temperature of 25 ° C. while stirring a mixed solution of 50 g, allyl alcohol 5 g and tetrahydrofuran 100 g.
Set to. To this solution, 8 g of dicyclohexyl dicarbodiimide (abbr. DCC), 0.2 g of 4- (N, N-diethylamino) pyridine and methylene chloride 2 g
0 g of the mixed solution was added dropwise over 1 hour. Further, the reaction was continued for 3 hours to complete the reaction. Next, 10 g of 80% formic acid was added to the reaction mixture, and the mixture was stirred for 1 hour. Then, insolubles were filtered off, and the filtrate was reprecipitated in 1 liter of methanol. After the precipitate was collected by filtration, it was dissolved again in 90 g of toluene, the insoluble matter was removed by filtration, and the filtrate was reprecipitated in 500 cc of methanol.
The precipitate was collected by filtration and dried. The yield of the obtained polymer was 3
At 2 g, Mw was 3 × 10 ⁴ .

[0114]

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Production Examples 2 to 7 of Dispersion Stabilizing Resin [PB]:
Resin PB-2 to PB-7 In Production Example 1 of dispersion stabilizing resin [PB], resin PA
-1 and allyl alcohol in place of resin PA in Table G below
Each dispersion stabilizing resin was produced in exactly the same manner as in Production Example 1 except that a polymerizable group-introducing compound was used.

[0116]

[Table 12]

Production Example 8 of dispersion stabilizing resin [PB]: Resin PB-8 A mixed solution of 75 g of octadecyl methacrylate, 2 g of 2-mercaptoethanol, 25 g of macromonomer M-29 and 250 g of tetrahydrofuran was heated to 70 ° C. under a nitrogen stream. Was heated. A. I. B. N. Was added and reacted for 4 hours. I. B. N. 0.3 g
Reacted for hours. Next, the reaction mixture was cooled to 25 ° C., and 8 g of vinyl acetic acid was added thereto. C.
C. Was added dropwise over 1 hour to a mixed solution of 10 g of 4-g, 4- (N, N-diethylamino) pyridine and 30 g of methylene chloride. Next, 30%
5 g of a hydrogen chloride ethanol solution and 5 g of water were added, and the mixture was stirred for 1 hour. After filtering off insolubles, the filtrate was reprecipitated in 2 liters of methanol. The precipitate was collected by filtration and dried. Mw of the obtained polymer was 3 × 10 ⁴ .

[0118]

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Production Example 9 of dispersion stabilizing resin [PB]: Resin PB-9 hexadecyl methacrylate 60 g, macromonomer M
A mixed solution of 40 g of −30 and 200 g of tetrahydrofuran was heated to a temperature of 75 ° C. under a nitrogen stream. 2,2'-azobis (2-cyanoheptanol) (abbreviation: AB
C. H. ) Was added and reacted for 4 hours. B. C.
H. Was added and reacted for 4 hours. Next, the reaction mixture was cooled to 25 ° C., and 6 g of methacrylic acid was added thereto. C. C. 9.5 g, 4- (N, N
A mixed solution of 0.4 g of-(diethylamino) pyridine and 40 g of methylene chloride was added dropwise over 1 hour.
Stirred for hours. Next, 10 g of an 85% formic acid aqueous solution was added,
The mixture was stirred for 1 hour. After filtering off insolubles, the filtrate was reprecipitated in 2 liters of methanol. The precipitate is collected by filtration,
Dried. Mw of the obtained polymer was 5.5 × 10 ⁴ .

[0120]

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Production Examples of Dispersion Stabilizing Resin [PB] 10-1
8: Resins PB-10 to PB-18 In Production Example 9 of dispersion stabilizing resin [PB], hexadecyl methacrylate, macromonomer M-30, and methacrylic acid as a polymerizable group-introducing compound were described in Table H below. Each dispersion stabilizing resin was produced in the same manner as in Production Example 9 except that each compound corresponding to each component was used. The Mw of the obtained resin was in the range of 4.5 × 10 ^{4 to} 6 × 10 ⁴ .

[0122]

[Table 13]

[0123]

[Table 14]

Production Example 19 of Dispersion Stabilizing Resin [PB]: Resin PB-19 Resin P synthesized in Production Example 17 of Dispersion Stabilizing Resin [PA]
A-17 100 g, glycidyl methacrylate 8 g,
A mixture of 1.0 g of N, N-dimethyldodecylamine, 0.5 g of t-butylhydroquinone and 200 g of toluene was stirred at a temperature of 100 ° C. for 12 hours. After cooling, the reaction solution was reprecipitated in 1.5 liters of methanol, collected by filtration, and dried to obtain 78 g of a pale yellow powder. Mw of the obtained polymer was 6.8 × 10 ⁴ .

[0125]

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Production Example 20 of Dispersion Stabilizing Resin [PB]: Resin PB-20 Resin P synthesized in Production Example 25 of Dispersion Stabilizing Resin [PA]
A solution of 100 g of A-25 dissolved in 200 g of tetrahydrofuran was cooled in a water bath to a temperature of 20 ° C., 10.2 g of triethylamine was added, and 14.5 g of methacrylic acid chloride was added dropwise with stirring at a temperature of 25 ° C. or lower. After the addition, the mixture was further stirred for 1 hour. Thereafter, 0.5 g of t-butylhydroquinone was added, the mixture was heated to a temperature of 60 ° C, and stirred for 4 hours. After cooling, the mixture was added dropwise to 1 liter of water while stirring (about 10 minutes), stirred for 1 hour, and allowed to stand.
Water was removed by decantation. 2 more water washes
After repetition, it was dissolved in 100 ml of tetrahydrofuran and reprecipitated in 2 liter of petroleum ether. The precipitate was collected by decantation and dried under reduced pressure. The yield of the obtained viscous material was 65 g, and Mw was 4.5 × 10 ⁴ .

[0127]

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Production Example 1 of Latex Particles: Latex Particle D-1 16 g of dispersion stabilizing resin P-1, 100 g of vinyl acetate,
A mixed solution of 5 g of divinyl adipate and 384 g of Isopar H was heated to a temperature of 70 ° C. while stirring under a nitrogen stream. 0.8 g of 2,2′-azobis (isovaleronitrile) (abbreviated AIVN) was added as a polymerization initiator,
The reaction was performed for 3 hours. Twenty minutes after addition of the initiator, cloudiness occurred and the reaction temperature rose to 88 ° C. Further, after adding 0.5 g of an initiator and reacting for 2 hours, the temperature was raised to 100 ° C. and the mixture was stirred for 2 hours to distill off unreacted vinyl acetate. After cooling, the mixture was passed through a 200-mesh nylon cloth, and the resulting white dispersion was a latex having a conversion of 90% and an average particle size of 0.23 μm. Particle size is CAPA-500 (Horiba, Ltd.)
Manufactured).

Latex Particle Production Examples 2 to 21: Latex Particles D-2 to D-21
Except for using the dispersion stabilizing resin and the monomer (D) shown in Table I below in place of -1 and divinyl adipate, the same procedure as in Production Example 1 was carried out except that the latex particles D- of the present invention were used. 2-D-21 were prepared. The polymerization rate of each obtained latex particle is 85 to 90%, and the average particle size is 0.15 to
The monodispersity was good within the range of 0.25 μm.

[0130]

[Table 15]

Production Example 22 of Latex Particles: Latex Particles D-22 A mixed solution of 8 g of dispersion stabilizing resin PB-9, 100 g of methyl methacrylate, 5 g of ethylene glycol diacrylate and 375 g of Isopar H was stirred while being stirred under a nitrogen stream. Heated to 40 ° C. A. I. V. N. To 0.
7 g was added and reacted for 4 hours. I. V. N. To 0.
5 g was added and reacted for 4 hours. After cooling, the mixture was passed through a 200-mesh nylon cloth, and the resulting white dispersion was a latex having a conversion of 98% and an average particle size of 0.25 μm.

Production Example 23 of Latex Particles: Latex Particle D-23 12 g of dispersion stabilizing resin PB-3 and 17 g of Isopar H were used.
7 g of the mixed solution was heated to a temperature of 60 ° C. while stirring under a nitrogen stream. 50 g of methyl methacrylate, 50 g of methyl acrylate, 5 g of ethylene glycol diacrylate
And 200 g of Isopar G and A.I. I. V. N. Was added dropwise over 2 hours, followed by stirring for 2 hours. Further, A. I. V. N. Was added and stirred for 3 hours. After cooling, the mixture was passed through a 200-mesh nylon cloth, and the resulting white dispersion was a latex having a conversion of 100% and an average particle size of 0.24 μm.

Latex Particle Production Examples 24 to 30: Latex Particles D-24 to D-30 Monomer (A) (that is, methyl methacrylate and methyl acrylate) used in latex particle production example 23, for dispersion stabilization Resin PB-3 and monomer (D)
Latex particles were produced in the same manner as in Production Example 23 except that the compounds shown in Table J below were used instead of (that is, ethylene glycol diacrylate).
The polymerization rate of each obtained latex particle is 95 to 100%.
The average particle size was in the range of 0.20 to 0.35 μm, and the monodispersity was good.

[0134]

[Table 16]

Production Example 31 of Latex Particles: (Comparative Example A) A latex particle was treated in the same manner as in Production Example 1 except that a mixed solution of 20 g of poly (octadecyl methacrylate), 100 g of vinyl acetate and 380 g of Isopar H was used. A white dispersion as latex particles having a polymerization rate of 88% and an average particle size of 0.23 μm was obtained.

Production Example 32 of Latex Particles: (Comparative Example B) Comparative dispersion stabilizing resin (1) having the following structure and synthesized by the method disclosed in JP-A-61-43775 was
Except that a mixed solution of 2 g, 100 g of vinyl acetate, 6 g of divinylbenzene and 388 g of Isopar H was used, the same treatment as in Production Example 1 of latex particles was carried out to obtain a conversion of 88%.
As a result, a white dispersion as latex particles having an average particle size of 0.18 μm was obtained.

[0137]

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Production Example 33 of Latex Particles: (Comparative Example C)
Except that 5 g of divinyl adipate was removed as in Example 1, the polymerization rate was 90% and the average particle size was 0.22.
A white dispersion as μm latex particles was obtained.

Production Example 34 of Latex Particles: (Comparative Example D) 97 g of octadecyl methacrylate, acrylic acid 3
g and a mixed solution of 200 g of toluene were heated to a temperature of 75 ° C. under a nitrogen stream. A. I. V. N. 1.0 g
Reacted for hours. Next, 6 g of glycidyl methacrylate,
1.0 g of t-butylhydroquinone and 1.2 g of N, N-dimethyldodecylamine were added, and 18
Stirred for hours. After cooling, the reaction solution was reprecipitated in 2 liters of methanol, collected by filtration and dried to obtain 84 g of a white powder.
I got Mw of the obtained comparative dispersion stabilizing resin (2) having the following structure was 5 × 10 ⁴ .

[0140]

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In the same manner as in Preparation Example 23 of latex particles, except that 18 g of the comparative dispersion stabilizing resin (2) was used instead of 12 g of the dispersion stabilizing resin PB-3 in Preparation Example 23 of latex particles. Thus, a white dispersion as latex particles having a polymerization rate of 98% and an average particle diameter of 0.30 μm was obtained.

Preparation Example 35 of Latex Particles: (Comparative Example E) In Preparation Example 23 of latex particles, 5 g of ethylene glycol diacrylate was used as the monomer (D).
The polymerization rate was 1 in exactly the same manner as in Production Example 23 except that
A white dispersion was obtained which was a latex particle having an average particle size of 0.23 μm at 00%.

Example 1 10 g of a dodecyl methacrylate / acrylic acid copolymer (copolymerization ratio: 95/5 by weight), 10 g of nigrosine and 30 g of Isopar G were placed on a paint shaker (manufactured by Tokyo Seiki Co., Ltd.) together with glass beads. Put it in for 4 hours,
A fine dispersion of nigrosine was obtained. Manufacturing of latex particles
30 parts of the resin dispersion of Preparation Example 1 (latex particles D-1)
g, 2.5 g of the above nigrosine dispersion, branched octadecyl alcohol FOC-1800 (manufactured by Nissan Chemical Industries, Ltd.) 1
A liquid developer for electrostatography was prepared by diluting 5 g and 0.07 g of octadecene-half-maleic acid octadecylamide copolymer into 1 liter of Isopar G.

(Preparation of Comparative Developers A to C) Three kinds of liquid developers A, B and C for comparison were prepared by replacing the resin dispersion in the production of the above liquid developer with the following resin dispersion. . Comparative liquid developer A: resin dispersion of Production Example 31 of latex particles. Comparative liquid developer B: resin dispersion of Production Example 32 of latex particles. Comparative liquid developer C: resin dispersion of Production Example 33 of latex particles.

Using these liquid developers for an electrophotographic plate making system, various characteristics were evaluated. The results are shown in Table K.

[0146]

[Table 17]

The measurement of each evaluation item in Table K was performed as follows. (Note 1) Stain on the developing device and plate image of the 2000th sheet: ELP404V, a fully automatic plate making machine (manufactured by Fuji Photo Film Co., Ltd.), and ELP Master II type electrophotographic photosensitive material using liquid developer (Fuji Photo Film Co., Ltd.) was exposed and developed. Plate making speed is 7
Performed at plate / min. Further, the presence or absence of toner adhesion stains on the developing device after processing 2,000 sheets of the ELP Master II type was observed. The blackening rate (image area) of the copied image is 30
% Of the manuscript.

(Note 2) Fixing property of image: Liquid developer was used for EL
A plate was prepared using the electrophotographic photosensitive material P-1 prepared as described below, using the developer of P404V, and the strength of the image area was visually evaluated using a friction tester. A liquid developer ELP-T (manufactured by Fuji Photo Film Co., Ltd.), which has practically sufficient fixability, was used as a liquid developer as a reference for evaluation. <Preparation of electrophotographic photosensitive material P-1> 34 g of binder resin B-1 having the following structure, 6 g of binder resin B-2 having the following structure, 200 g of photoconductive zinc oxide, 0.03 g of uranine, and 0 Rose Bengal A mixture of 0.06 g, 0.02 g of tetrabromophenol blue, 0.30 g of phthalic anhydride, 0.01 g of o-chlorophenol and 300 g of toluene was treated with a homogenizer (manufactured by Nippon Seiki Co., Ltd.) at 1 × 10 ⁴ r.
The dispersion was performed at a rotation speed of pm for 10 minutes. This dispersion for forming a photosensitive layer was applied to a conductive treated paper with a wire bar so as to have a dry adhesion amount of 26 g / m ² , dried at 100 ° C. for 30 seconds, and then heated at 120 ° C. for 1 hour. Then 2 in the dark
The mixture was allowed to stand for 24 hours at 0 ° C. and 65% RH to produce an electrophotographic photosensitive material P-1.

[0149]

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(Note 3) Resist property of toner image: An etching machine was used to make a plate-making master using a desensitizing liquid ELP-EX (manufactured by Fuji Photo Film Co., Ltd.) under the same conditions as in (Note 2) above. Was passed through once, immersed in a hydrophilic treatment solution E-1 of a photoconductive layer binder resin having the following formulation for 5 minutes, and then washed with water and dried. The image portion of the obtained printing original plate was observed with an optical microscope, and the presence or absence of damage to the image portion was visually evaluated. <Preparation of Hydrophilizing Solution E-1> Monoethanolamine 8
0 g, Newcol B4SN (Nippon Emulsifier Co., Ltd.) 8
g and 100 g of benzyl alcohol in distilled water.
After adjusting to liter, the pH was adjusted to 11.0 with potassium hydroxide to prepare a treatment liquid E-1.

(Note 4) Printing durability: The printing plate precursor subjected to plate making and hydrophilizing treatment under the conditions of (Note 3) was diluted 20 times with distilled water as a fountain solution. Using a solution and a neutral paper as a base paper for printing, under the condition that a printing machine Hamadaster 800SX (manufactured by Hamadastar Co., Ltd.) is used.
And the number of printed sheets in which the image portion of the printed matter was not lost was examined.

From the results shown in Table K, the developers of the present invention and Comparative Example C did not cause stains on the developing device, and the image on the 2,000 th plate was clear, showing good results.
This indicates that the dispersibility and the redispersibility are good. On the other hand, in the developers of Comparative Examples A and B, the redispersibility deteriorated, and the reproducibility of the actual copied image was adversely affected.

When the mechanical strength of the toner image area was evaluated by forcibly rubbing, all the toner particles were good. That is, it was confirmed that the particles of the present invention had practically sufficient fixability.

Further, when the zinc oxide and the binder resin B-1 in the non-image area of the plate surface after plate making are each converted to hydrophilic by chemical treatment, the image area is sufficiently resisted by the toner layer, and the image area is deficient. Examination was made under forced conditions to determine whether or not the toner particles were generated. As a result, defects were found in fine areas of the toner image portion such as fine lines and fine characters, except for the toner particles of the present invention. In addition, when processed under normal desensitizing conditions and printed as an offset master plate, clear prints were obtained with only the present invention even after printing 5,000 sheets. Comparative Examples A and B
In the case of, a decrease in the reproducibility of the copied image at the time of plate making appeared in the printed matter as it was, and the lack of fine lines and fine characters was observed from the start of printing. Further, in Comparative Example C, at the time of printing, thin lines, fine characters, and the like were missing on about 2,000 sheets from the start of printing.

As described above, only the liquid developer of the present invention
In an electrophotographic plate making system using an electrophotographic photoreceptor having improved printing characteristics, excellent dispersibility / redispersibility and printing durability were satisfied.

Example 2 Production Example 24 of Latex Particle (Latex Particle D-2)
30 g of the resin dispersion of 4) , 10 g of branched hexadecyl alcohol FOC-1600 (manufactured by Nissan Chemical Industries, Ltd.), and 0.06 g of octadecyl vinyl ether / half-maleic acid dodecylamide copolymer were diluted to 1 liter of Isopar G. Thus, a liquid developer for electrostatography was prepared.

(Preparation of Comparative Developers D and E) Two kinds of liquid developers D and E for comparison were prepared by replacing the resin dispersion in the production of the above liquid developer with the following resin dispersion. Comparative liquid developer D: resin dispersion of Production Example 34 of latex particles. Comparative liquid developer E: resin dispersion of Production Example 35 of latex particles.

Using these liquid developers for an electrophotographic plate making system, various characteristics were evaluated. The results are shown in Table L.

[0159]

[Table 18]

In Table L, the dirt on the developing device and 200
Measurement of the evaluation items of the 0th plate image was performed in the same manner as in Example 1. The other evaluation items were measured as follows. (Note 5) Resist property of toner image: Electrophotographic photosensitive material P-2 prepared according to the following prescription was used in a dark place with a surface potential of +450 V.
2.8-mW output gallium-aluminum-arsenic semiconductor laser (oscillation wavelength 780)
nm) on the photosensitive material surface using 60 erg / cm
Under the irradiation amount of ² , pitch 25μm and scanning speed 3
After exposure at a speed of 00 m / sec, a toner image was obtained by applying a bias voltage of 30 V to the counter electrode and developing using each of the above liquid developers. Further, the toner image was fixed by heating at 100 ° C. for 1 minute.

<Preparation of Electrophotographic Photosensitive Material P-2> X-type metal-free phthalocyanine (manufactured by Dainippon Ink KK) as an organic photoconductive compound was 1.9 parts by weight, and as an additive, a thiobarbitur having the following structure was used. 0.15 parts by weight of an acid compound, 17 parts by weight of a binder resin B-3 having the following structure, and 1 part by weight of a mixed solution of tetrahydrofuran / cyclohexane in an 8/2 weight ratio.
00 parts by weight were put together with glass beads in a glass container of 500 ml and dispersed with a paint shaker for 60 minutes. Then, the glass beads were separated by filtration to obtain a dispersion for a photoconductive layer. Next, the dispersion liquid for a photoconductive layer is coated on a grained aluminum plate having a thickness of 0.25 mm, and dried to obtain an electrophotographic printing plate precursor having a photoconductive layer having a dry film thickness of 6.0 μm. It was adjusted.

[0162]

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Each of the masters thus obtained was immersed in a processing solution E-2 having the following formulation for 30 seconds to remove the photoconductive layer in the non-image area, washed with water for 30 seconds, and then dried with a drier. Air dried. <Prescription of treatment liquid E-2> Potassium silicate 40 g Potassium hydroxide 10 g Ethanol 100 g Water 800 g The presence or absence of fine lines / fine characters in the image portion of this printing original plate was checked with a 60-fold loupe (PEAK ( Co., Ltd.).

(Note 6) Printing durability: Each offset printing original plate produced by operating each photosensitive material under the same conditions as in the above (Note 5) was gummed, and then subjected to an offset printing machine (Sakurai Seisakusho Co., Ltd.) ) Oliver 52 type) indicates the number of sheets that can be printed without causing any problem in background stain on the non-image area of the printed matter and the image quality of the image area (the larger the number of printed sheets, the better the printing durability).

From the results shown in Table L, the liquid developers of the present invention and Comparative Example E showed good redispersibility, and the image on the plate after 2,000 sheets was also good. However, in Comparative Example D, toner scum was generated, the developing portion was stained, and the plate image was also missing after 2000 sheets of fine lines and fine characters.

Next, the plate after plate making was eluted from the non-image area with an alkaline processing solution to obtain an offset master plate. At this time, in Comparative Example E, a small area portion of the toner image portion such as a thin line or a thin character was missing. This indicates that the resist properties of the toner layer with respect to the processing liquid were not sufficient, and the toner layer was dissolved and eluted during the processing. On the other hand, in the present invention and Comparative Example D, these phenomena were not observed, and sufficient resist properties were shown.

Furthermore, as an offset master master,
As a result of actual printing, the image quality of the printed matter of the present invention was clear even after printing 100,000 sheets or more. However, Comparative Example D is poor copy image reproducibility during plate making, and Comparative Example E is because the resist of the processing solution dissolving and removing the non-image area is not sufficient, both well as precursor for an offset master Since high image reproducibility was not obtained, the image quality of the printed matter was deteriorated from the start of printing, and a printed matter having a sufficient image quality was not obtained.

As described above, only the liquid developer of the present invention
In an electrophotographic plate making system in which a non-image portion was eluted to be a printing original plate, excellent dispersibility, re-dispersibility and printing durability were satisfied.

Example 3 10 g of a tetradecyl methacrylate / methacrylic acid copolymer (copolymerization ratio: 95/5 by weight), and nigrosine 1
0 g and 30 g of Isopar G were put together with glass beads in a paint shaker (manufactured by Tokyo Seiki Co., Ltd.) and dispersed for 4 hours to obtain a fine dispersion of nigrosine. 30 g of the resin dispersion of Production Example 1 for latex particles, 2.5 g of the above nigrosine dispersion, 0.06 g of a hexadecene / half-maleic acid octadecylamide copolymer, and FOC-180
0 was diluted to 1 liter of Isopar G to prepare a liquid developer for electrostatography.

The obtained liquid developer of the present invention was used in Example 1.
When the contamination of the developing device and the 2000th plate image were evaluated under the same conditions as (Note 1) of the evaluation items, good results were obtained as in Example 1 in each case.

Next, the electrophotographic photosensitive material P-3 prepared according to the following formulation was charged to -6 kV in a dark place, and then a gallium-aluminum-arsenic semiconductor laser (oscillation wavelength: 780 nm) having a 2.0 mW output was used as a light source. And a pitch of 25 μm on a photosensitive material surface under an irradiation dose of 45 erg / cm ^2.
After exposure at a scanning speed of m and a scanning speed of 330 m / sec, development was performed using the liquid developer of the present invention, and further heating at 60 ° C. for 30 seconds to obtain a toner image.

<Preparation of Electrophotographic Photosensitive Material P-3> 25 g of a binder resin B-4 having the following structure was prepared.
5, 9 g of binder resin B-6 having the following structure, 200 g of photoconductive zinc oxide, 0.3 g of phthalic anhydride, 0.01 g of phenol, 0.018 of cyanine dye A having the following structure
g and 300 g of toluene were dispersed at a rotation speed of 1 × 10 ⁴ rpm for 10 minutes using a homogenizer to prepare a dispersion for forming a photosensitive layer. This was applied to a conductive treated paper with a wire bar so that the dry adhesion amount was 25 g / m ² , dried at 100 ° C. for 20 seconds, and further dried at 120 ° C. for 1 second.
Heated for hours. Then, the electrophotographic photosensitive material P is allowed to stand in a dark place at 20 ° C. and 65% RH for 24 hours.
-3 was prepared.

[0173]

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[0174]

Embedded image

The original plate thus obtained was passed through an etching machine once using ELP-EX, and then immersed in a photoconductive layer binder resin hydrophilizing solution E-3 having the following formulation for 3 minutes. Then, it was washed with water and dried. <Preparation of treatment liquid E-3> 80 g of diethanolamine, 5 g of Neosoap (manufactured by Matsumoto Yushi Co., Ltd.) and 80 g of methyl ethyl ketone were dissolved in distilled water to make 1 liter, and the pH was adjusted to 11.0 with potassium hydroxide. Treatment liquid E-3
Was prepared.

Observation of the image portion of the obtained printing original plate with an optical microscope showed that there were no defects such as fine lines and fine characters in the toner image portion, and the resist properties of the toner particles of the present invention were good. Next, the printing durability was the same as in Example 1, except that the above-mentioned master was used as an offset master master, and a solution obtained by diluting the processing solution E-3 ten times with distilled water was used as a dampening solution. As a result, 3,000 prints having good print quality were obtained.

Examples 4 to 15 In Example 1, the latex particles of the liquid developer of the present invention were used.
Each liquid developer was prepared in the same manner as in Example 1, except that latex particles shown in Table M below were used instead of the child D-1 .

[0178]

[Table 19]

Each of the obtained liquid developers was used in an electrophotographic plate making system in the same manner as in Example 1 to examine the performance. Each liquid developer shows the same performance as in Example 1,
Redispersibility, fixability, resistability and printing durability were all good.

Examples 16 to 25 In the same manner as in Example 2, except that the latex particles shown in Table N below were used instead of the latex particles D-24 of the liquid developer of the present invention, respectively. By operation, each liquid developer was produced.

[0181]

[Table 20]

The obtained liquid developers were used in an electrophotographic plate making system in the same manner as in Example 2 to examine the performance. Each liquid developer shows the same performance as in Example 2,
Redispersibility, resist properties and printing durability were all good.

Example 26 A mixture of 100 g of the white resin dispersion obtained in Production Example 29 of latex particles and 1.5 g of Sumicalon Black was heated to a temperature of 100 ° C., and heated and stirred for 4 hours. After cooling to room temperature, the remaining dye was removed by passing through a 200-mesh nylon cloth to obtain a black resin dispersion having an average particle size of 0.21 μm. A liquid developer was prepared by diluting 30 g of the above black resin dispersion and 0.05 g of zirconium naphthenate into 1 liter of Shellsol 71. When this was developed by the same apparatus as in Example 1, no toner stain was generated on the apparatus even after 2,000 sheets were developed. Also, in the same manner as in Example 1, the plate was made into a plate for offset master by performing plate making and etching treatment.
The printed matter after 3,000 sheets was a printed matter of clear image quality.

Example 27 A mixture of 100 g of the white resin dispersion obtained in Production Example 30 of latex particles and 3 g of Victoria Blue B was heated to a temperature of 70 ° C. to 80 ° C. and stirred for 6 hours. After cooling to room temperature, the remaining dye was removed through a 200-mesh nylon cloth to obtain a blue resin dispersion having an average particle size of 0.25 μm. A liquid developer was prepared by diluting 32 g of the blue resin dispersion and 0.05 of zirconium naphthenate to 1 liter of Isopar H. When this was developed by the same apparatus as in Example 3, no toner adhesion stains were observed on the apparatus even after 2,000 sheets were developed. Further, the image quality of the obtained master plate for offset printing was clear, and the image quality of the printed matter after printing 3,000 sheets was also very clear.

[0185]

According to the present invention, a liquid developer having excellent dispersion stability, redispersibility and fixability was obtained. In particular, as a developer for an electrophotographic plate making system, the resist properties of the toner image portion were excellent, and thus the printing durability of the obtained offset master plate was remarkably improved.

Claims (3)

(57) [Claims] 1. A liquid developer for electrophotography 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. The following general formula (I) is provided only at one end of the united main chain.
A comb-type copolymer containing at least one macromonomer (M) having a weight average molecular weight of 1 × 10 ³ to 2 × 10 ^{4 formed} by bonding a polymerizable double bond group represented by In the presence of a dispersion stabilizing resin [P] soluble in the non-aqueous solvent, which contains at least a component represented by the following general formula (II) as a repeating unit of the main chain portion and / or comb portion of the copolymer: A monofunctional monomer (A) that is soluble in the non-aqueous solvent but is insolubilized by polymerization; and a polyfunctional monomer having two or more polymerizable functional groups copolymerizable with the monomer (A). A liquid developer for electrophotography, which is a copolymer resin particle obtained by polymerizing a solution containing at least one kind of each of the hydrophilic monomers (D). Embedded image In the formula (I), X ⁰ represents —COO—, —OCO—, —CH _{2
OCO -, - CH 2 COO -} , - O -, - SO 2 -, -
^{CO -, - CONR 11 -,} - SO 2 NR 11 -, or a phenylene group (wherein R ¹¹ represents a hydrogen atom or a hydrocarbon group). a ¹ and a ² may be the same or different from each other, and each represents a hydrogen atom, a halogen atom, a cyano group, a hydrocarbon group, -COO-Z ¹ , or -C via a hydrocarbon group.
It represents a OO-Z ¹ (wherein Z ¹ represents a hydrogen atom or a hydrocarbon group). Embedded image In formula (II), X ¹ has the same content as X ⁰ in formula (I). Q ¹ represents an aliphatic group having 6 to 32 carbon atoms. b ¹
And b ² may be the same or different from each other, and have the formula (I)
It represents the same contents as a ¹ and a ^{2 in FIG} . 2. The dispersion stabilizing resin [P] is provided at one end of the polymer main chain with —PO ₃ H ₂ , —SO ₃ H, and —COO.
H, -P (= O) ( OH) R 1 [wherein R ¹ represents a hydrocarbon group or -OR ² (R ² represents a hydrocarbon group)], -OH, -SH, formyl group, - CONR
³ R ⁴ , —SO ₂ NR ³ R ⁴ [where R ³ and R ⁴ are
Each independently representing a hydrogen atom or a hydrocarbon group], a cyclic acid anhydride-containing group, and at least one polar group selected from amino groups. Developer. 3. The dispersion stabilizing resin [P] comprises a polymerizable functional group copolymerizable with the monomer (A) at one end of the polymer main chain. Item 4. The liquid developer for electrostatography according to Item 1.