JP2002311631A - Lubricant composition for electrophotographic transfer paper, coating composition and transfer paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lubricant composition which prevents double feed and paper jamming of electrophotographic transfer paper sheets and improves the running performance of the paper, to provide a coating composition for electrophotographic transfer paper containing a lubricant composition and to provide electrophotographic transfer paper containing the coating composition. SOLUTION: In electrophotographic transfer paper obtained by applying and drying a coating composition containing a pigment and an adhesive as essential components on base paper, a specified wax component having 0.01-10 μm cumulative average particle diameter is incorporated into the coating composition of the uppermost layer by 0.2 to 10 parts by mass (expressed in terms of solid matter) based on 100 parts by mass of all the pigment to obtain the objective electrophotographic transfer paper having high quality mage reproducibility, less to cause double feed and paper jamming in copying and having excellent running performance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lubricant composition for transfer paper for electrophotography. More specifically, a lubricant composition for preventing double feeding and paper jam of electrophotographic transfer paper and improving runnability, a coating composition for electrophotographic transfer paper containing the same, and an electronic composition containing the same It relates to a photographic transfer paper.

[0002]

2. Description of the Related Art In recent years, as the performance of electronic copiers and printers has been improved, not only high-quality image reproducibility but also higher processing speed has been demanded for the efficiency of copying work. However, with this, problems such as double feeding and paper jam at the time of copying have become remarkable, and development of electrophotographic transfer paper having excellent running properties has been promoted.

[0003]

In recent years, as an electrophotographic transfer paper, a coated paper provided with a coating layer mainly composed of a pigment and an adhesive on a base paper in order to improve printability has been used. However, such coated paper is considered to increase the frictional resistance between transfer papers for electrophotography and cause running troubles such as double feeding and paper jam. As a method for preventing the double feeding trouble, a method of adding 2 to 10 parts by mass of silica having a particle size of 1 μm or less in Japanese Patent Publication No. 2-48892 and a method of styrene-acrylic acid or styrene- A method of applying a surface sizing agent, which is a copolymer of methacrylic acid, has been proposed, but the effect of preventing double feed is insufficient, and the development of transfer paper for electrophotography that is excellent in the effect of preventing double feed is required. Had been.

[0004]

Means for Solving the Problems The present inventors have made intensive studies to solve such problems, and as a result, have completed the present invention. That is, in the present invention, the cumulative average particle diameter is 0.1.
The lubricant composition for an electrophotographic transfer paper containing a wax component of 0.01 to 10 μm as an essential component, and the above lubricant composition in terms of solid content with respect to 100 parts by mass of all pigments in the coating composition of the uppermost layer. An electrophotographic transfer paper coating composition characterized by containing 0.2 to 10 parts by mass, and a coating composition containing a pigment and an adhesive as a main component coated on a base paper and dried. Wherein the lubricant composition contains 0.2 to 10 parts by mass in terms of solids based on 100 parts by mass of the total pigment in the coating composition of the uppermost layer. Transfer paper.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The wax component that can be used in the lubricant composition for electrophotographic transfer paper of the present invention means a substantially water-insoluble wax.

The wax component which can be used in the lubricant composition for electrophotographic transfer paper of the present invention includes polyethylene wax, polypropylene wax, ethylene-propylene copolymer wax, Fischer-Tropsch wax and partial oxides thereof or ethylene. Synthetic hydrocarbon waxes such as copolymers with unsaturated unsaturated carboxylic acids, modified waxes such as montan wax derivatives, paraffin wax derivatives, microcrystalline wax derivatives,
Hydrogenated waxes such as hardened castor oil and hardened castor oil derivatives; higher fatty acids such as cetyl alcohol, stearic acid and 12-hydroxystearic acid; alcohols; ester waxes such as glyceryl stearate and polyethylene glycol stearate; fatty acid amides; fatty acid metal salts Phthalic anhydride, chlorinated hydrocarbons and the like. Preferred among these are polyethylene wax, polypropylene wax, ethylene-
Modification of synthetic hydrocarbon waxes such as propylene copolymerized waxes, Fischer-Tropsch waxes and their partial oxides or copolymers with ethylenically unsaturated carboxylic acids, montan wax derivatives, paraffin wax derivatives, microstalin wax derivatives, etc. Waxes, higher fatty acids and alcohols such as cetyl alcohol, stearic acid and 12-hydroxystearic acid, fatty acid amides and fatty acid metal salts, more preferably polyethylene wax, polypropylene wax, ethylene-propylene copolymer wax, Fischer-Tropsch Synthetic hydrocarbon waxes such as waxes and their partial oxides or copolymers with ethylenically unsaturated carboxylic acids, fatty acid amides and fatty acid metal salts, especially Those Masui include polyethylene wax, polypropylene wax, ethylene - propylene copolymer wax, Fischer-Tropsch wax and their partial oxide, fatty acid amides and fatty acid metal salts.

In the present invention, the cumulative average particle diameter of the wax component (50% volume average particle diameter by a laser diffraction type particle size distribution analyzer) is usually 0.01 to 10 μm, preferably 0.05 to 5 μm, and more preferably 0 to 5 μm. .05-3μ
m. When the cumulative average particle diameter is smaller than 0.01 μm or larger than 10 μm, sufficient double feed prevention performance cannot be obtained.

[0008] The wax component in the present invention may be added to the coating composition as a powder or may be added as a water dispersion. The aqueous dispersion of the wax component is prepared by first pulverizing the wax component and dispersing it in water with a stirring mixer or a disperser in the presence of the emulsifying dispersant, or adding water, the wax component and the emulsifying dispersant to a reaction vessel, And then cooled by emulsifying and dispersing with a stirrer or disperser, or rapidly adding the wax component heated above the melting point to water in the presence of an emulsifying dispersant to disperse or heating above the melting point. The wax component is obtained by, for example, adding water little by little to the wax component and then dispersed. However, the present invention is not limited thereto, and an aqueous dispersion may be obtained by using any emulsification and dispersion method.

The lubricant composition for transfer paper for electrophotography of the present invention contains, in addition to the wax component, an essential component, an emulsifying dispersant used for emulsifying and dispersing the wax component, an antioxidant, an ultraviolet absorber, and a water retention agent. Agents, flow improvers, thickeners, water resistance agents, preservatives and fungicides, bactericides, defoamers, fragrances, dyes, pigments, and the like.

The emulsifying dispersant used for emulsifying and dispersing the wax component is not particularly limited as long as the wax component can be dispersed or emulsified and dispersed in water. Nonionic surfactants, anionic surfactants, and cationic surfactants Agent,
Amphoteric surfactants and / or water-soluble polymers can be used.

Examples of the nonionic surfactant include sorbitan fatty acid ester, glycerin fatty acid ester, polyoxyethylene castor oil fatty acid ester, polyoxyethylene hardened castor oil fatty acid ester, diglycerin fatty acid ester, sucrose fatty acid ester, and polyglycerin fatty acid ester. Polyglycerol condensed ricinoleate, polyether modified silicone, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene sorbite fatty acid ester, polyoxyethylene glycerin fatty acid ester, polyoxyethylene alkyl phenyl ether (polyoxyethylene octyl phenyl ether and polyoxyethylene) Ethylene nonyl phenyl ether, etc.), polyoxyethylene alkyl ether (polyoxyethylene stearyl) And polyoxyethylene secondary tridecyl ethers), polyoxyethylene propylene alkyl phenyl ether, polyoxyethylene castor oil ether, polyoxyethylene hydrogenated castor oil ether, polyoxyethylene alkylamine and polyoxyethylene fatty acid amide (laurin) Acid diethanolamide and stearic acid monoethanolamide).

Examples of the anionic surfactant include sulfonates (dodecylbenzene sulfonate, dioctyl sulfosuccinate, α-olefin sulfonate, secondary alkane sulfonate, polystyrene sulfonate, naphthalene sulfonate) Formalin condensate),
Sulfate salt (lauryl alcohol sulfate salt,
Polyoxyethylene stearyl alcohol sulfate and polyoxyethylene nonyl phenyl ether sulfate, etc.), phosphates (stearyl alcohol phosphate, polyoxyethylene lauryl alcohol phosphate and polyoxyethylene nonyl phenyl ether phosphorus) Acid ester salts) and fatty acid ester salts (such as palmitate, oleate and stearate). Salts include amine compounds such as ammonia, alkylamines (such as monoethylamine, monobutylamine and triethylamine) and alkanolamines (such as monoethanolamine, diethanolamine and triethanolamine), and metals of Group 1 of the Periodic Table of the Elements (lithium,
Metals such as sodium and potassium) and Group 2 metals of the periodic table (eg magnesium, calcium and zinc)
And the like, and may be completely or partially salted.

Examples of the cationic surfactant include a primary amine salt (such as lauryl ammonium chloride and stearyl ammonium bromide), a secondary amine salt (such as dilauryl ammonium chloride and distearyl ammonium chloride), and a tertiary amine salt (such as lauryl ammonium chloride and distearyl ammonium chloride). Lauryl dimethyl ammonium chloride and benzyl dimethyl ammonium chloride, etc.), quaternary ammonium salts (lauryl trimethyl ammonium chloride, stearyl trimethyl ammonium bromide, etc.)
And so on.

Examples of the amphoteric surfactant include amino acid-type amphoteric surfactants (such as sodium laurylaminopropionate and sodium stearylaminodiacetate) and betaine-type amphoteric surfactants (such as stearyldimethylbetaine and lauryldihydroxyethylbetaine). can give.

Water-soluble polymers that can be used as emulsifying dispersants include cellulose, pullulan, sodium alginate, gum arabic, guar gum, carrageenan, gelatin, curdlan, agar, starch, hyaluronic acid, scleroglucan, schizophyllan, lentinan, Paramylon, callose, laminaran, glucomannan, arabinogalactan, xanthan gum, welan gum, ramzan gum, tragacanth gum, carob gum, locust bean gum, pectin, quince seed, alge colloid,
Glycyrrhizic acid, dextran, collagen, casein, albumin, agarose, glycogen, methylcellulose, ethylcellulose, nitrocellulose, carboxymethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, hydroxyethylmethylcellulose, cellulose sodium sulfate, carboxymethylethylcellulose, propylene alginate Glycol esters, polyvinylpyrrolidone, carboxymethyl starch, methylhydroxypropyl starch, cellulose acetate phthalate, polyvinyl alcohol (partially saponified polyvinyl alcohol, fully saponified polyvinyl alcohol and those having a sulfone group introduced into them), polyethylene oxide, poly Xylene propylene copolymer, polyacrylamide, polymethacrylamide, polyacrylic acid, polyacrylate, polymethacrylic acid, polymethacrylate, polystyrenesulfonic acid, polystyrenesulfonic acid, naphthalenesulfonic acid formalin condensate, naphthalenesulfone Salt of acid formalin condensate, copolymer of acrylamide and acrylic acid, copolymer of acrylamide and methacrylic acid, copolymer of methacrylamide and acrylamide, copolymer of methacrylamide and methacrylic acid, methacrylamide and methacrylic acid And copolymers of salts. In addition,
Salts include amine compounds such as ammonia, alkylamines (such as monoethylamine, monobutylamine and triethylamine) and alkanolamines (such as monoethanolamine, diethanolamine and triethanolamine), and metals of the first group of the periodic table (lithium and sodium). And potassium, etc.) and metals of Group 2 of the periodic table (magnesium, calcium, zinc, etc.) and the like, and may be completely or partially salted.

The proportion of the emulsifying and dispersing agent used is the wax component 1
The amount is 0.3 to 50 parts by mass, preferably 0.5 to 20 parts by mass, and more preferably 0.5 to 10 parts by mass with respect to 00 parts by mass. If the amount of the emulsifying dispersant is less than 0.3 part by mass, aggregation of the wax component and layer separation occur, and a stable aqueous dispersion having a concentration of 10% by mass or more cannot be obtained. If the amount exceeds 50 parts by mass, the printing quality and the like deteriorate.

As the stirring mixer, a propeller type stirring machine,
Dissolvers, homomixers, ball mills, sand mills, ultrasonic dispersers, kneaders and line mixers can be used.

Examples of the disperser include a propeller type stirrer (propeller mixer, turbine mixer, desolver, etc.),
Media type that crushes and disperses using various media such as piston high-pressure emulsifier, ultrasonic emulsifier / disperser, pressure nozzle emulsifier, high-speed rotating high-shear stirring / dispersing machine, colloid mill, glass beads and steel balls. A disperser such as a sand grinder, an agitator mill, a ball mill, and an attritor can be used. Two or more of these equipments can be used in combination, and a stirring and mixing machine can be used in combination.

The coating composition of the present invention mainly comprises a pigment, an adhesive component and the lubricant composition of the present invention.
Other various types such as dispersants, water-proofing agents, water-retaining agents, fluidity improvers, thickeners, defoamers, lubricants, wetting agents, antioxidants, ultraviolet absorbers, coloring agents, and preservatives as required Auxiliaries can be used as appropriate.

The pigment used in the coating composition includes
Kaolin clay, delaminated clay, calcined clay, heavy calcium carbonate, light calcium carbonate, titanium oxide, satin white, aluminum hydroxide, talc,
Examples thereof include silica, calcium sulfate, barium sulfate, zinc oxide, activated clay, diatomaceous earth, lake and plastic pigment, and these can be used alone or in combination as appropriate.

The adhesive component used in the coating composition includes styrene / butadiene, styrene / acryl, vinyl acetate, acrylic, ethylene / vinyl acetate, methyl methacrylate / butadiene, butyl acrylate and the like. Synthetic adhesives such as copolymer latex, polyvinyl alcohol, maleic anhydride copolymer, acrylic acid / methyl methacrylate copolymer, oxidized starch, esterified starch, enzyme-modified starch, cold water soluble starch,
General pigment-coated paper adhesives such as phosphoric esterified starch, hydroxyethylated starch, casein and natural adhesives such as soybean protein are used alone or in combination.
These adhesives are usually used in an amount of 5 per 100 parts by mass of the pigment.
It is used in the range of about 30 parts by mass, preferably about 6 to 25 parts by mass. If the amount is less than 5 parts by mass, the coating layer strength is not sufficient, and if the amount exceeds 30 parts by mass, the print quality is reduced.

The content of the lubricant composition is usually 0.2 to 10 parts by mass, preferably 0.3 to 9 parts by mass in terms of solid content, based on 100 parts by mass of the total pigment in the coating composition of the uppermost layer. Parts by mass,
More preferably, it is 0.5 to 8 parts by mass. When the content is less than 0.2 parts by mass, the effect of preventing double feeding is not sufficient, and when the content is more than 10 parts by mass, toner fixability and the like deteriorate.

The method of preparing the coating composition is not particularly limited. For example, in the presence of a dispersant, the pigment is added to water using a stirring mixer or a disperser used for preparing the above-mentioned lubricant composition. After being uniformly dispersed, an adhesive component, a lubricant composition and other necessary dispersants, waterproofing agents,
Add various auxiliaries such as water retention agent, fluidity improver, thickener, defoamer, lubricant, wetting agent, antioxidant, ultraviolet absorber, coloring agent and preservative, and uniform with propeller stirring mixer Can be obtained.

The electrophotographic transfer paper of the present invention is obtained by coating the coating composition of the present invention on a base paper mainly composed of pulp fibers, on one or both sides thereof, a single layer or two or more layers, and then drying. .

The pulp used in the base paper of the present invention includes wood pulp made from wood fibers such as hardwood and softwood (mechanical pulp such as groundwood pulp, refiner groundwood pulp and thermomechanical pulp, kraft pulp and sulfite pulp, etc.). Chemical pulp, chemical ground pulp, semi-chemical pulp such as neutral sulphite semi-chemical pulp, etc.), recycled paper pulp made from newspaper, magazine, information paper and printing paper (disintegrated pulp and deinked pulp), other than wood Pulp made from non-wood fibers (pulp made from non-wood fibers such as pagasu, kenaf, reed, straw, hemp, and linter), and synthetic fibers such as nylon, vinylon, tetron, acrylic, rayon, and polyolefin into pulp Synthetic pulp, etc.) The these appropriately alone or in combination may be used.

The coating composition of the present invention comprises a blade coater, an air knife coater, a roll coater, a reverse roll coater, and the like, which are used in the production of ordinary pigment coated paper.
Curtain flow coater, rod coater, die coater, gravure coater, champlex coater, brush coater, two-roll or metering blade type size press coater, bill blade coater,
Coating can be performed by an on-machine or off-machine coater equipped with a coating device such as a short dwell coater and a gate roll coater. The coating amount of the coating composition is usually 5 to 40 g / m ^{2 in} dry mass per one side.
It is preferable that the coating is performed in the range of 10 to 25 g / m ² from the viewpoint of blank paper quality and printability. As a method for drying the wet coating layer on the base paper, various heating and drying methods such as hot air heating, gas heater heating, high frequency heating, electric heater heating, infrared heater heating, laser heating, and electron beam heating are appropriately used. be able to. Further, for the transfer paper of the present invention, a surface treatment device such as a super calender, a mat calender, a soft nip calender, and a machine calender may be used for adjusting the glossiness of the white paper and improving the printability.

The solid content concentration when the coating composition is coated on a base paper is generally 20 to 75% by mass.
In consideration of the operability affected by the viscosity of the coating liquid, the content is preferably 55 to 65% by mass.

The electrophotographic transfer paper of the present invention may contain various polymer compounds and additives. For example, natural polymer polysaccharides such as star gum and alginic acid derivatives, rosin derivatives, dialkyl ketones, alkenyl or alkyl succinic anhydrides, epoxidized higher fatty acid amides, sizing agents such as organic fluoro compounds and dialkyl ketene dimer emulsions, starch, Starch derivatives (cationized starch, phosphated starch, oxidized starch, etc.), polyacrylamide, polyvinyl alcohol, polyvinyl alcohol derivatives (completely saponified, partially saponified, carboxy-modified, cationic-modified, other modified polyvinyl alcohol, etc.) , Gelatin (alkali treatment, acid treatment and various modified gelatins, etc.)
Dry paper strength enhancer such as polyamide polyamine epichlorohydrin resin, melamine resin, urea resin, wet paper strength enhancer such as epoxidized polyamide resin, stabilizer, dye,
Antioxidants, optical brighteners, various latexes, inorganic electrolytes (sodium chloride, sodium sulfate, sodium phosphate, calcium chloride, lithium chloride, magnesium chloride, magnesium sulfate, barium chloride, etc.), pH adjusters, fixing agents (sulfuric acid Band, aluminum chloride, etc.), and additives such as an organic conductive agent can be appropriately combined and contained. These additives may be dispersed in the pulp slurry at the papermaking stage, may be added at a dub size after papermaking, or the solution may be applied with various coaters.

[0029]

EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to the following examples. The multifeed evaluation, the coefficient of static friction, the evaluation method of the surface smoothness and the toner fixability of the electrophotographic transfer paper obtained in Examples and Comparative Examples and the method of measuring the average particle diameter of the wax component used in Examples and Comparative Examples are described. It is shown below.

Double feed evaluation: An electrophotographic transfer machine (DocuC, manufactured by Fuji Xerox Co., Ltd.) under the conditions of 20 ° C. and 65% RH.
When 1000 sheets of A4 size paper were printed using an entre 400 FS), the number of sheets fed by double feeding was evaluated.

Toner fixability: An electrophotographic transfer machine (Fuji Xerox Co., DocuCentre 400FS) was used to print on electrophotographic transfer paper created in the evaluation of multifeed, and the fixability of the toner at that time was observed. Was evaluated. The evaluation criteria are as follows. ：: Excellent toner fixability was obtained. Δ: No problem in practical use, but inferior to that of “○”. D: Poor toner fixability, causing practical problems.

Coefficient of friction: JIS. According to P8147, the coefficient of static friction between the paper surfaces of the electrophotographic transfer paper prepared at the time of the double feed evaluation was measured using a friction coefficient measuring device (Tensilon UTIII type, manufactured by Toyo Baldwin Co., Ltd.). The smaller the coefficient of static friction, the better the slipperiness.

Particle size measurement: Laser light diffraction / scattering method particle size distribution analyzer (Leeds & Northrup,
MICROTRACHRA) under the following conditions. The cumulative average particle size is the particle size when the volume percentage becomes 50%. Sample solid concentration: 2.5% Flow rate: 40 ml / sec Measurement time: 30 sec

Examples 1-21 and Comparative Examples 1-11 Kaolin (ENGELHARD MINERAL & CH)
60 parts by mass of Ultra White 90 manufactured by EMICALS, 30 parts by mass of light calcium carbonate (Tamapearl TP-222H, manufactured by Okutama Industry Co., Ltd.), calcined kaolin (EN)
10 parts by mass of GELARDMINERAL & CHEMICALS Inc., Ansilex) was dispersed in water using 0.2 parts by mass of a dispersant (SN Dispersant 5040, manufactured by San Nopco Co., Ltd.), and styrene-butadiene latex (manufactured by JSR Corporation) was used. JSR0696) 1
5 parts by mass, oxidized starch (manufactured by Japan Food Processing Co., Ltd., MS-3)
600) 3 parts by mass, and the aqueous dispersions of wax components A to W (Examples 1 to 21 and Comparative Examples 1 to 11) shown in Table 1 were further added in the amounts shown in Tables 2 and 3, respectively. Thus, a coating composition having a solid content of 64% was obtained. This coating composition was applied to a high-quality paper base paper having a basis weight of 64 g / m ² , and the coating amount was 1 per side.
Using a blade coater to coat both sides using a blade coater and drying to 5 g / m ² , pass through a pressure nip composed of a metal roll and an elastic roll, and apply JIS. Electrophotographic transfer paper was prepared by adjusting the surface so that the glossiness of white paper at an incident / reception angle of 75 degrees based on Z8741 was 55%. For comparison,
A coating composition containing no wax components A to W was prepared, and an electrophotographic transfer paper whose surface was adjusted by coating and drying in the same manner was prepared (Comparative Example 12).

Tables 2 and 3 show the results of double feed evaluation, the coefficient of static friction, the surface smoothness and the toner fixability of the transfer paper for electrophotography obtained in Examples 1 to 21 and Comparative Examples 1 to 12.

[0036]

[Table 1]

[0037]

[Table 2]

[0038]

[Table 3]

[0039]

As is clear from Tables 2 and 3, the transfer paper for electrophotography of the present invention exhibits higher quality image reproducibility than the conventional transfer paper for electrophotography, and double feed during copying. There is almost no running trouble such as paper jam or paper jam, and the running performance is excellent.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4H104 BA02A BB17A BE11A CA02A CA03A CA16A DA05A EA08 FA01 FA02 PA50 QA02 4J038 BA121 BA212 CB022 CB082 CC041 CC061 CE021 CF021 CF031 CG011 CG141 HA216 HA286 HA526 HA08 MA10 NA04 PA19 PB08 PB11

Claims (5)

[Claims] 1. A lubricant composition for electrophotographic transfer paper, comprising a wax component having a cumulative average particle size of 0.01 to 10 μm as an essential component. 2. The wax component is at least one selected from the group consisting of polyethylene wax, polypropylene wax, ethylene-propylene copolymer wax, Fischer-Tropsch wax or partial oxides thereof, fatty acid amides, and fatty acid metal salts. The lubricant composition for an electrophotographic transfer paper according to claim 1. 3. The cumulative average particle size of the lubricant composition for an electrophotographic transfer paper according to claim 1 or 2 is 0.01.
A lubricant composition for transfer paper for electrophotography, which is an aqueous dispersion of 10 to 10 μm. 4. The lubricant composition according to claim 1, wherein in the coating composition containing a pigment and an adhesive as a main component, 100 parts by weight of all pigments in the coating composition of the uppermost layer. Of 0.2 to 10 parts by mass in terms of solid content. 5. An electrophotographic transfer paper obtained by coating a base paper with a coating composition containing a pigment and an adhesive as main components, and including 100% by weight of all pigments in the uppermost coating composition. Part of the lubricant composition according to any one of claims 1 to 3,
An electrophotographic transfer paper containing 0.2 to 10 parts by mass in terms of solid content.