JP3151894B2 - Transfer paper for electrophotography - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic transfer paper used for an electrophotographic copying machine or printer.

[0002]

2. Description of the Related Art Conventionally, as a transfer paper for electrophotography, as disclosed in JP-A-54-18740 and JP-A-54-22831, talc, kaolin, clay and the like are used as fillers. The acidic paper used is dominant. However, in the paper industry in recent years, when producing high quality paper for printing and writing, calcium carbonate is used as a filler,
In addition, the use of neutral sizing agents as sizing agents, that is, so-called neutralization, is increasing. The advantage of neutralizing high-quality paper is that the use of inexpensive calcium carbonate as a filler can reduce the production cost of paper, as well as energy saving in paper production,
It is possible to achieve various purposes such as saving resources, improving productivity, extending the life of equipment, and purifying wastewater.

Examples of the application of such neutral papermaking technology to electrophotographic transfer paper include JP-A-59-162560, JP-A-61-63854, JP-A-61-67038, JP 62
-6994, etc., and alkenyl succinic anhydride and alkyl ketene dimer are disclosed as sizing agents used in these cases. However, when alkenyl succinic anhydride or alkyl ketene dimer is used as a sizing agent, stains are generated particularly in the wire section, the press section, the dryer section, etc. of the papermaking system during the production of electrophotographic transfer paper, and as a result, There are quality problems such as spots on the paper. In order to solve such a quality problem, it is sufficient to clean the generated dirt, but there is a disadvantage that the operability is greatly reduced. Further, as a problem peculiar to the alkyl ketene dimer, there is also a problem at the time of using the formed paper such that the transfer paper is supplied in an overlapped manner at the time of electrophotographic printing because the coefficient of friction of the formed paper is low.

Further, there is a movement to use recycled paper using waste paper for transfer paper for electrophotography in order to cope with global environmental problems such as protection of forest resources. However, neutral recycled paper that uses waste paper is classified into ground pulp (GP),
Since a high-yield pulp such as thermomechanical pulp (TMP) is mixed, a sufficient sizing effect is hardly obtained when alkenyl succinic anhydride or alkyl ketene dimer is used as a sizing agent. Further, the alkyl ketene dimer is usually made at pH 8 or more,
When the pH is 8 or more, there is a problem that the whiteness of the paper decreases due to the effect of the resin component contained in the high-yield pulp.
The size effect is insufficient near ~ 8 neutrality.

[0005]

DISCLOSURE OF THE INVENTION The present invention uses waste paper containing no papermaking stains, having an optimum friction coefficient for electrophotographic transfer paper, and containing high-yield pulp. An object of the present invention is to provide an electrophotographic transfer paper having an excellent size effect even on recycled paper.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, have prepared a paper using an aqueous emulsion containing a specific rosin substance as a dispersed phase as an internal sizing agent. And the paper obtained in this way
Apply a specific conductive agent to the surface to obtain a specific surface property value range
In the case of adjusting to, it has been found that the above problems can be completely solved, and the present invention has been completed.

That is, the present invention relates to an electrophotographic transfer paper obtained by making a paper at pH 6 to 8 containing pulp fiber, a sizing agent and a filler as main components, and (a) rosin as the sizing agent; (B) A polyhydric alcohol and (c) an α, β-unsaturated carboxylic acid derivative are reacted sequentially or simultaneously, and the charged ratio of (b) hydroxyl equivalent to (b) carboxyl equivalent is 0. 1-1.
5. A transfer paper for electrophotography in which a rosin material of No. 5 is formed using an aqueous emulsion as a disperse phase, and then a conductive agent is applied to the surface of the transfer paper, and the smoothness (J. TAPPINo. 2.5 by Wang ceremony)
28 seconds, electric resistance (relative humidity 65%, temperature 20 ° C) is 1
0 ⁹ ~10 ¹⁰ Ω, static friction coefficient (J.TAPPI No.
30 (based on the horizontal method) of 0.03 or less .

In the present invention, (a) rosins, (b) polyhydric alcohols, and (c) α, β-unsaturated carboxylic acid-modified rosin esters formed from α, β-unsaturated carboxylic acid derivatives are mainly used. An aqueous emulsion having a specific rosin substance as a component as a dispersed phase is used as a sizing agent.

Here, (a) rosins are gum rosin,
Wood rosin, tall oil rosin and the like. In addition, rosins may be partially used in combination with modified rosins such as hydrogenated rosin, disproportionated rosin, polymerized rosin, and aldehyde-modified rosin.

Further, in the present invention, as the rosin substance, those obtained by esterifying the above-mentioned (a) rosin and (b) polyhydric alcohol are used. And esterification of at least one of α, β-unsaturated carboxylic acid-modified rosins, which includes both full esterification and partial esterification.

(B) As the polyhydric alcohol, various known alcohols can be used, but trihydric or tetrahydric alcohols are preferable. For example, glycerin, trimethylolpropane, trimethylolethane, 3-methylpentane-
Trihydric alcohols such as 1,3,5-triol; tetrahydric alcohols such as pentaerythritol and diglycerin; amino alcohols such as triethanolamine and triisopropanolamine; and one or more of these are used. .

In the present invention, rosins are represented by (c) α,
Modification with a β-unsaturated carboxylic acid derivative is required, which improves the size effect in the neutral region.
Examples of the α, β-unsaturated carboxylic acid derivatives include maleic anhydride, maleic acid, maleic acid monoesters or maleic acid diesters obtained from lower alcohols and maleic anhydride, fumaric acid, N-alkylmaleimides, itaconic acid , Itaconic anhydride, acrylic acid, etc., among which maleic anhydride, maleic acid, maleic monoesters, itaconic acid and itaconic anhydride are preferred.

The α, β-unsaturated carboxylic acid-modified rosin ester, which is a rosin substance constituting the disperse phase in the aqueous emulsion of the present invention, comprises (a) a rosin, (b) a polyhydric alcohol and (c) α, It is obtained by reacting with a β-unsaturated carboxylic acid derivative sequentially or simultaneously. Here, “sequentially” means that (b) may be reacted after (b) is reacted with (a), or (b) may be reacted after reacting (c) with (a). Means

The case of reacting (c) after reacting (b) with (a) will be described. First, (a) rosin and the (b) polyhydric alcohol are esterified by a known method. That is, after both are charged, dehydration condensation is carried out with stirring at a temperature of about 150 to 300 ° C. for about 3 to 40 hours under normal pressure, reduced pressure or increased pressure, depending on the boiling point of the polyhydric alcohol. In the reaction, if necessary, a solvent such as benzene, toluene or xylene can be used to perform azeotropic dehydration.

In the present invention, the rosin and the polyhydric alcohol are used in a specific charge ratio, that is, an equivalent ratio of the hydroxyl group of the polyhydric alcohol to the carboxyl group of the rosin [-OH (eq) /-COOH. (Eq)] is 0.1
To 1.5, preferably 0.1 to 1.0. When the equivalent ratio is less than 0.1, the sizing effect of the obtained sizing agent in the neutral region is not sufficiently improved, which is not preferable. Further, when the equivalent ratio exceeds 1.5, a large amount of free hydroxyl groups remains in the polyhydric alcohol esters of rosin to be formed. Therefore, when this is used as a sizing agent, it is caused by residual hydroxyl groups. This is not preferable because the size effect is reduced.

According to the above reaction, usually, a fully esterified product in which all of the hydroxyl groups of the polyhydric alcohol are esterified with a carboxyl group of the rosin, a partially esterified product in which a part of the hydroxyl groups are esterified, and A mixture containing reaction raw materials is produced. In the present invention, the mixture is then modified with (c) an α, β-unsaturated carboxylic acid derivative according to known modification conditions. That is, after adding (c) to the reaction product of (a) and (b) obtained above, the reaction can be performed under normal reaction conditions, for example, at a temperature of 150 to 300 ° C.
The desired rosin substance can be obtained by reacting for about 0.5 to 24 hours.

The amount of (c) the α, β-unsaturated carboxylic acid derivative used in the above reaction is usually 1 mol or less, preferably 0.05 to 0.75 mol per 1 mol of rosin. It is about mol, particularly preferably about 0.10 to 0.70 mol.

After reacting (a) with (c),
(B) can also be reacted. In this case, (a)
The rosins are modified with (α) an α, β-unsaturated carboxylic acid derivative under the same modification conditions as described above, and the obtained reaction product is subjected to the above-mentioned ( B) The desired rosin substance can be obtained by esterification using a polyhydric alcohol. Furthermore, (a),
(B) and (c) can be simultaneously reacted. In this case, (a) the rosin and the (b) polyhydric alcohol and the (c) α, β-unsaturated carboxylic acid derivative within the above-mentioned equivalent ratio range are usually added at a temperature of about 150 to 300 ° C. for 3 to 3 hours.
By reacting for about 40 hours, the desired rosin substance can be obtained.

The rosin material thus obtained usually has a softening point of about 90 to 130 ° C. and an acid value of about 140 to 270.

The rosin material is usually α, β-unsaturated carboxylic acid-modified rosin ester, rosin ester,
It is a mixture containing an α, β-unsaturated carboxylic acid-modified rosin and unreacted raw materials. In the present invention, as long as the reaction product is the above-mentioned predetermined reaction product, it can be used as it is as a dispersed phase of an aqueous emulsion. .

Generally, α, β-unsaturated carboxylic acid-modified rosin esters (completely esterified and / or partially esterified) and rosin esters not modified with the carboxylic acid (fully esterified and / or) The partially esterified product) contains about 5% by weight or more of the above rosin substance in the total solid content. In addition, the rosin substance may further contain α, β-unsaturated carboxylic acid-modified rosins, if necessary.
Rosins and the like may be added. In this case, even after the addition, the total weight of the α, β-unsaturated carboxylic acid-modified rosin ester and the rosin ester is preferably 5% by weight or more based on the total solid content, and the performance of the obtained sizing agent is taken into consideration. In this case, the content is more preferably 10% by weight or more. If the proportion of these esters is less than 5% by weight, the size effect is undesirably reduced.

The rosin substance is dispersed in water in the presence of a dispersant to form an aqueous emulsion. The dispersant is not particularly limited, and various surfactants, polymer dispersants, protective colloids and the like can be used.

As the surfactant, alkyl benzene sulfonate, alkyl sulfate, rosin soap, polyoxyethylene alkyl phenyl ether sulfate, polyoxyethylene alkyl phenyl ether sulfonate, polyoxyethylene alkyl phenyl ether sulfosuccinate, Examples thereof include anionic dispersants such as polyoxyethylene distyryl phenyl ether sulfate and sulfosuccinate of polyoxyethylene distyryl phenyl ether, and nonionic dispersants such as polyethylene oxide and polypropylene oxide.

The polymer dispersant is not particularly limited, and any of anionic copolymers, cationic copolymers and amphoteric copolymers obtained by copolymerizing various unsaturated monomers can be effectively used. . Here, generally, an anionic copolymer means 20 to 80% by weight of an anionic unsaturated monomer,
Preferably, it is a copolymer composed of 30 to 70% by weight and 20 to 80% by weight, preferably 30 to 70% by weight of a nonionic unsaturated monomer. 1 to 90% by weight, preferably 10 to 6%
0% by weight and a copolymer comprising 10 to 99% by weight, preferably 40 to 90% by weight of a nonionic unsaturated monomer.
0% by weight, preferably 10 to 40% by weight, cationic unsaturated monomer 1 to 60% by weight, preferably 10 to 40% by weight and nonionic unsaturated monomer 20 to 90% by weight, preferably 20 to 90% by weight. It refers to a copolymer consisting of 80% by weight.

Examples of the anionic unsaturated monomer include various ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, itaconic acid and maleic anhydride, and ammonium salts or alkali metal salts thereof. Of these, acrylic acid and methacrylic acid are particularly preferred. In order to convert the anionic unsaturated monomer component into an ammonium salt or an alkali metal salt, an alkali material such as ammonia, a lower amine, or an alkali metal hydroxide is used after obtaining a copolymer by a polymerization method described later. And neutralize it.

As the cationic unsaturated monomer, N, N
-Dialkylaminoalkyl (meth) acrylate,
N, N-dialkylaminoalkyl (meth) acrylamides, their mineral salts and their quaternaries; allylamine, diallylamine, diallylmonomethylamine,
Dimethyldiallylammonium chloride and the like correspond.
Of these, preferred are N, N-dimethylaminomethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, N, N-diethylaminomethyl (meth) acrylate, N, N-diethylaminoethyl ( (Meth) acrylate, N, N-dimethylaminopropyl (meth) acrylate, N, N-diethylaminopropyl (meth) acrylate, N, N-dimethylaminomethyl (meth) acrylamide, N, N-dimethylaminoethyl (meth) acrylamide , N, N-
Diethylaminomethyl (meth) acrylamide, N, N
-Diethylaminoethyl (meth) acrylamide, N,
N-dimethylaminopropyl (meth) acrylamide,
Mention may be made of N, N-diethylaminopropyl (meth) acrylamide, their mineral salts and their quaternaries. Hydrochloric acid, sulfuric acid, and the like are suitable as the mineral acids used to form the above mineral salts. The quaternizing agent is not particularly limited and various known ones can be used.
Preferable examples include epihalohydrin, methyl halide, benzyl halide, methyl sulfate and the like. In addition, the quaternization reaction can be performed not only on the monomer but also on the naturally obtained copolymer. .

The nonionic unsaturated monomer is represented by the following general formula (1):

[0028]

Embedded image

Acrylates or methacrylates (both are referred to as (meth) acrylates), styrenes such as styrene and α-methylstyrene, and the aromatic ring of these styrenes having carbon atoms 1-4
Styrene monomer of a styrene compound having an alkyl group of (meth) acrylamide, (meth) acrylonitrile, vinyl acetate, vinyl propionate, having 6 to 2 carbon atoms
2, α-olefins, alkyl vinyl ethers having 1 to 22 carbon atoms, vinyl pyrrolidone, and the like. Of these, (meth) acrylates and styrene monomers are particularly preferred.

Specific examples of the anionic copolymer include a styrene- (meth) acrylic acid-based copolymer and a (meth) acrylic acid- (meth) acrylate-based copolymer. Specific examples of the cationic copolymer include a styrene-N, N-dialkylaminoalkyl (meth) acrylate copolymer, a styrene-N, N-dialkylaminoalkyl (meth) acrylamide copolymer, and (meth) An acrylate-N, N-dialkylaminoalkyl (meth) acrylate-based copolymer, a (meth) acrylate-N, N-dialkylaminoalkyl (meth) acrylamide-based copolymer and the like can be mentioned. Specific examples of the amphoteric copolymer include styrene- (meth) acrylic acid-N, N-dialkylaminoalkyl (meth) acrylate copolymer, styrene- (meth) acrylic acid-N, N-dialkylaminoalkyl ( (Meth) acrylamide-based copolymer, (meth) acrylate- (meth) acrylic acid-N, N-dialkylaminoalkyl (meth) acrylate-based copolymer, (meth) acrylate- (meth) acrylic acid- N, N-dialkylaminoalkyl (meth) acrylamide copolymers and the like can be mentioned.

As the method for producing the copolymer, various known methods such as solution polymerization, emulsion polymerization and suspension polymerization can be employed as they are. In addition, since the molecular weight of the obtained copolymer is directly correlated with the dispersibility of the rosin substance, it is usually preferable that the weight average molecular weight is 1,000 to 200,000.

As the protective colloid, casein,
Lecithin, polyvinyl alcohol, cationized starch, modified epichlorohydrin of polyamide-polyamine, modified epichlorohydrin of dicyandidiamide resin, modified Mannich of polyacrylamide, acrylamide-dimethylaminoethyl methacrylate copolymer, decomposed Hofmann of polyacrylamide And a copolymer of dialkyldiallylammonium chloride and sulfur dioxide.

To produce the aqueous emulsion of the present invention, for example, JP-B-53-4866 (melting high-pressure emulsification method), JP-B-53-22090 (solvent high-pressure emulsification method) or JP-A-52-77206. , Tokiko 58-4
Any known method such as 938 (inversion emulsification method) can be adopted.

For example, in the case of the solvent high-pressure emulsification method, a dispersing agent and water, and if necessary, sodium hydroxide, potassium hydroxide, ammonia, lower grade, are added to a rosin substance previously dissolved in an organic solvent insoluble in water. An alkali substance such as an amine is added, emulsified through a homogenizer, a piston-type high-pressure emulsifier, an ultrasonic emulsifier, or the like, and then the organic solvent is distilled off.

In the case of the inversion method, a rosin material is usually heated and stirred at 90 to 160 ° C. to prepare a molten rosin material. Next, an aqueous solution of a dispersant and a predetermined amount of hot water are added to the molten rosin substance while stirring to invert the phase, thereby forming an aqueous emulsion in which the rosin substance is a dispersed phase and water is a continuous phase.

In the above solvent high pressure emulsification and inversion emulsification,
The dispersant is usually 1 to 3 on a dry weight basis relative to the rosin material.
0% by weight, preferably in the range of 2 to 20% by weight. 1
When the amount is less than 30% by weight, the dispersing power is not sufficient, and when the amount exceeds 30% by weight, it is not economical. In addition, these emulsions obtained as desired can be diluted with water or alkaline water to adjust the pH of the emulsion.

The rosin emulsion obtained is usually 10
It has a solids content of .about.70% by weight, preferably 30.about.55% by weight, and the rosin substance is uniformly dispersed in the emulsion as particles of 1 .mu.m or less, mostly 0.5 .mu.m or less. The aqueous emulsion has a milky appearance,
It usually has a pH of 2.0 to 6.5.

The filler used in the present invention is not particularly limited, and various known calcium carbonates such as heavy calcium carbonate and precipitated calcium carbonate, and inorganic and organic fillers such as talc, clay and kaolin can be used. Further, the pulp fiber is not particularly limited, and pulp for recycled paper such as used newspaper can be sufficiently used.

In the electrophotographic transfer paper of the present invention, a filler and the above-mentioned aqueous emulsion as a sizing agent are added to pulp fibers, and the papermaking pH is 6 to 8, preferably 6.5.
The paper is adjusted by using an aluminum compound such as aluminum sulfate so as to be ~ 7.5. If the pH is to be lower than 6, a large amount of an aluminum compound is required, and when calcium carbonate or the like is used as a filler, decomposition occurs, which is not preferable. If the pH is higher than 8, the size effect becomes insufficient, which is not preferable.

In producing the electrophotographic transfer paper of the present invention using the sizing agent obtained as described above, in order to impart electrophotographic copying machine aptitude such as copy aptitude, phototacticity and curl, the following is required. The blending, adjustment, and control of the production conditions are carried out as shown in (Japanese Patent Publication No. 44-3673,
46-24199, Japanese Patent Publication No. 55-47385).

Specifically, the sizing agent is usually added to the pulp in an amount of about 0.01 to 2.0% by weight, and the filler is usually added to the pulp in an amount of about 2 to 20% by weight.
Paper-made. Further, in order to maintain an appropriate copy image density and prevent background (white background) staining, a conductive agent such as sodium chloride, potassium chloride, a styrene-maleic acid copolymer, or a quaternary ammonium salt is used for the paper machine. The surface electric resistance (according to JIS C-2111) of the transfer paper is set to 10 ⁹ Ω to 10 ¹⁰ Ω by applying the surface with a size press.
(Relative humidity 65%, temperature 20 ° C). In addition, if swelling or curling occurs due to partial absorption of the transfer paper, the degree of close contact between the photoreceptor of the copy paper and the transfer paper at the time of transfer will decrease, causing a decrease in copy image density and partial omission of the copy. To prevent this, the paper is wrapped with moisture-proof wrapping paper so that the moisture content of the paper is 4.5 to 5.5% so as to prevent moisture absorption and desorption during storage.

[0042]

According to the present invention, the papermaking machine is not stained during the electrophotographic transfer paper making process, thereby improving the commercial value of the papermaking and eliminating the need for washing work, thus improving the efficiency of papermaking work. Can also be greatly improved. Further, since the coefficient of friction of the obtained transfer paper is within an appropriate range, a great effect such as the problem of the transfer paper being overlapped during the copying operation can be achieved. In addition, recycled paper made from used paper exhibits an excellent size effect, and can contribute to global environmental problems.

[0043]

EXAMPLES The present invention will be described in more detail with reference to examples and comparative examples, but the present invention is not limited to these examples. In addition, in each example, parts and% are based on weight.

(Production Example of α, β-unsaturated carboxylic acid-modified rosin ester) Production Example 1 An acid value was placed in a 1-liter flask equipped with a stirrer, a thermometer, a nitrogen inlet tube, a water separator, and a condenser. 100 parts of gum rosin 170 and 4 parts of glycerin (charge equivalent ratio (-OH / -C
OOH) = 0.43) and 250 ° C. under a nitrogen stream.
And esterified at the same temperature for 8 hours, softening point 81
A reaction product having an acid value of 91 ° C. was obtained. Next, the reaction was
The temperature was raised to 0 ° C, 9 parts of maleic anhydride was added, and the mixture was heated and kept at 210 ° C for 2 hours to obtain a reaction product having a softening point of 102 ° C and an acid value of 183.

Production Example 2 The procedure of Production Example 1 was repeated except that the amount of glycerin was changed to 6 parts (equivalent ratio = 0.65).
A reaction product having a softening point of 105 ° C. and an acid value of 153 was obtained.

Production Example 3 The procedure of Production Example 1 was repeated, except that 4.4 parts of pentaerythritol (equivalent ratio = 0.43) was used instead of 4 parts of glycerin. Price 1
81 reaction products were obtained.

Production Example 4 A reaction product having a softening point of 106 ° C. and an acid value of 206 was obtained in the same manner as in Production Example 1, except that the charged amount of maleic anhydride was changed to 12 parts.

Production Example 5 A reaction product having a softening point of 122 ° C. and an acid value of 183 was obtained in the same manner as in Production Example 1 except that 10.7 parts of fumaric acid were used instead of 9 parts of maleic anhydride. Was.

(Production Example of Emulsion Sizing Agent) Production Example 6 300 parts of the reaction products obtained in Production Examples 1 to 5 shown in Table 1 were heated and melted at 160 ° C., and the aqueous dispersant solution shown in Table 1 was stirred while stirring. Was added over 1 hour in terms of solid content. Hot water is gradually added to the thus obtained water-in-oil emulsion while stirring to invert the phase to form an oil-in-water emulsion, which is further diluted with hot water to have a concentration of 50%.
Was prepared.

[0050]

[Table 1]

Examples 1 to 12 L-BKP (400 ml csf freeness) and NB
The compounding ratio of KP (freeness 500ml csf) is 8
0:20 pulp (1), L-BKP (freeness 450 ml csf), N-BKP (freeness 55)
0ml csf) and newspaper DIP (Freeness 200
Using the pulp (2) having a mixing ratio of 30:20:50 with the chemical formulation shown in Table 2 or 3,
And papermaking in fourdrinier paper machine (500 meters / min) to prepare a sheet and then applying the oxidized starch 1 g / m ² and sodium chloride 0.1 g / m ² as a surface sizing agent.

Comparative Examples 1 to 8 In the same manner as in the above examples, papers were prepared according to the chemical formulations shown in Table 4 or Table 5.

The stain on the press roll during papermaking was measured as a doctor adhesion amount. As the physical properties of the electrophotographic transfer paper, whiteness (according to JIS P 8123,
Pulp (2) only), smoothness (J. TAPPI
No. 5 and the coefficient of static friction (J. TA)
(By the horizontal method of PPI No 30). Also,
The maximum value of the difference in the coefficient of static friction between the upper and lower sheets, which is related to the double feeding (feeding several sheets in a pile), was determined (the smaller the difference, the more constant the coefficient of friction, the more difficult the double feeding). Further, the measurement of the number of times of double feeding is performed by an electrophotographic copying machine (Cannon
P-4835, manufactured by Canon Inc.)
It was represented by the number of double feeds that occurred when 00 sheets were copied. The results are shown in Table 2, Table 3, Table 4, or Table 5.

[0054]

[Table 2]

[0055]

[Table 3]

[0056]

[Table 4]

[0057]

[Table 5]

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-250297 (JP, A) JP-A-60-161472 (JP, A) JP-A-3-62042 (JP, A) JP-A-3-62042 82899 (JP, A) JP-A-64-57267 (JP, A) JP-A-62-198877 (JP, A) JP-A-62-198875 (JP, A) JP-A-5-125693 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G03G 7/00 D21H 17/62

Claims (2)

(57) [Claims] 1. An electrophotographic transfer paper comprising a pulp fiber, a sizing agent and a filler as main components and obtained by making a paper at pH 6 to 8, wherein (a) a rosin and (b) a large amount The polyhydric alcohol and (c) the α, β-unsaturated carboxylic acid derivative are reacted sequentially or simultaneously, and the ratio of the (b) hydroxyl equivalent to the (a) carboxyl equivalent is 0.1-1. After making a paper using an aqueous emulsion of the rosin material 5 as a disperse phase,
An electrophotographic transfer paper obtained by applying a conductive agent to the surface of the transfer paper, and the smoothness of the surface (J. TAPPIN)
o. No. 5 according to Oken's formula) for 23 to 28 seconds, electric resistance (relative humidity 65%, temperature 20 ° C.) 10 ⁹ to 10 ¹⁰ Ω, static friction coefficient (by the horizontal method of J. TAPPI No. 30)
Wherein the maximum value of the difference is 0.03 or less . 2. The electrophotographic transfer paper according to claim 1, wherein the conductive agent is at least one selected from the group consisting of sodium chloride, potassium chloride, a styrene-maleic acid copolymer, and a quaternary ammonium salt.