WO2006035878A1 - 電子写真用転写紙 - Google Patents
電子写真用転写紙 Download PDFInfo
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- WO2006035878A1 WO2006035878A1 PCT/JP2005/017966 JP2005017966W WO2006035878A1 WO 2006035878 A1 WO2006035878 A1 WO 2006035878A1 JP 2005017966 W JP2005017966 W JP 2005017966W WO 2006035878 A1 WO2006035878 A1 WO 2006035878A1
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- paper
- weight
- transfer paper
- calcium carbonate
- electrophotographic transfer
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
- G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
- G03G7/0013—Inorganic components thereof
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
- G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
- G03G7/002—Organic components thereof
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
- G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
- G03G7/002—Organic components thereof
- G03G7/0026—Organic components thereof being macromolecular
- G03G7/004—Organic components thereof being macromolecular obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
- G03G7/006—Substrates for image-receiving members; Image-receiving members comprising only one layer
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
- G03G7/006—Substrates for image-receiving members; Image-receiving members comprising only one layer
- G03G7/0066—Inorganic components thereof
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
- G03G7/006—Substrates for image-receiving members; Image-receiving members comprising only one layer
- G03G7/0073—Organic components thereof
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
- Y10T428/253—Cellulosic [e.g., wood, paper, cork, rayon, etc.]
Definitions
- the present invention relates to an electrophotographic transfer paper, and in particular, satisfies the continuous paper passing property in an electrophotographic sheet high-speed copying machine or printer (hereinafter referred to as "high-speed copying machine"),
- the present invention relates to an electrophotographic transfer paper that has excellent performance in terms of color printability and is suitable for text paper.
- electrophotographic high-speed paper compatible paper uses a continuous paper type or continuous paper supplied by winding.
- electrophotographic copying machines or printers that use small-judgment paper have been developed that have a speed of 135 to 180 sheets per minute.
- sheet paper small judgment paper
- An electrophotographic copying machine and a printer are devices suitable for small lot printing of several thousand copies or less, such as manuals called on-demand printing and self-publishing. For this reason, it is preferable to use a sheet that can respond to customer demands.
- sheet-fed copiers and printers have the disadvantage that it is difficult to achieve high-speed printing compared to continuous paper.
- Sheet-fed copiers and printers have low passability because they are fed sequentially with a roll or belt that does not grab the paper with a nail like a sheet-fed offset printing machine. When paper (mainly low stiffness) is used, the paper cannot be passed between rolls, so that it becomes impossible to pass paper called jam, and continuous printing becomes difficult.
- high-quality paper has been used as a sheet suitable for a sheet-type high-speed electrophotographic copying machine or printer.
- coated paper type paper that can respond to a wide range of customer demands and has excellent printability and can be continuously printed by a high-speed copying machine. It came to be done.
- weight (basis weight) and thickness are important when used as text paper for books. Per sheet of paper Although the weight of is small, when it becomes a large number of aggregates like a book, it becomes quite heavy. In particular, books that use coated paper as the text paper are very heavy, so light and thin books are required.
- the conventional technology for electrophotographic paper provided with a pigment-containing coating layer on the base paper surface is a coating layer containing a pigment having a specific particle size and an adhesive on the base paper surface.
- a paper is disclosed that is subjected to a smoothing treatment after being provided to define a center line average roughness, surface electrical resistance, or a coefficient of static friction between papers (Patent Documents 1 to 3).
- Patent Documents 1 to 3 these electrophotographic papers have not been satisfactory in terms of image quality reproducibility and paper feedability.
- Patent Document 4 by adjusting the basis weight, surface roughness and stiffness of the coating layer, it is possible to improve image suitability and paper passing. Is not enough, and high-speed paper passing performance is obtained!
- Patent Document 1 Japanese Patent Laid-Open No. 62-198875
- Patent Document 2 Japanese Patent Laid-Open No. 62-198876
- Patent Document 3 Japanese Patent Application Laid-Open No. 62-198877
- Patent Document 4 Japanese Unexamined Patent Publication No. 2000-172001
- an object of the present invention is to provide an electrophotographic transfer paper that is excellent in full-color image reproducibility even at a low basis weight, and also excellent in paper passing properties to a high-speed copying machine or the like. is there.
- the present inventors have determined that in an electrophotographic transfer paper in which a coating layer having a pigment and an adhesive is provided on the surface of the base paper, kaolin and Z having a specific particle size distribution in the coating layer.
- a delaminated tray having a specific average particle size as a pigment it is excellent in color printability and, in addition, not only continuous paper passing in high-speed electrophotographic copying machines and printers, but also small judgment judgment. It was found that the paper passing performance of the paper was also good.
- certain light carbonate carbonate in the base paper Um z When silica composites are included as fillers, the stiffness of electrophotographic transfer paper is improved, paper penetration is improved even at low basis weights, and image density is improved. Means to solve
- the present invention is an electrophotographic transfer paper in which a coating layer having a pigment and an adhesive is provided on at least one side of a base paper that also has pulp and filler power.
- a coating layer having a pigment and an adhesive is provided on at least one side of a base paper that also has pulp and filler power.
- kaolin has a particle size distribution included 65% or more in the range of 2 m, and / or, together with the containing Deramine one Ted clay having an average particle diameter of 3. 5 to 20 m 30 weight 0/0 or more
- the electrophotographic transfer paper is characterized in that the Clark stiffness in the CD direction of the electrophotographic transfer paper is 20 cm 3 Zl00 or more.
- the light calcium carbonate Z silica composite preferably contains a light calcium carbonate Z silica composite in which the surface of the light calcium carbonate particles is coated with silica in the base paper.
- the weight ratio of light calcium carbonate to silica in the product (light calcium carbonate Z silica) force is more preferably 30Z70 to 70Z30.
- the time required for the maximum value of the charged voltage to decay to 1Z2 is particularly preferably 0.25 seconds or less. Yes.
- the transfer sheet for electrophotography of the present invention not only has excellent color printability, but also has good image density and gloss of the printed part, and also has good continuous paper passing properties in a high-speed electrophotographic copying machine or the like.
- the paper-passing property is good even with a small judgment paper having a low basis weight, it is convenient for self-publishing and suitable as a text sheet for books.
- FIG. 1 is a conceptual diagram for measuring a suspended curl.
- the base paper used in the present invention mainly has pulp and filler power.
- the pulp used include LBKP (hardwood bleached kraft pulp), NBKP (softwood bleached kraft pulp), L Chemical pulps such as BSP (hardwood bleached sulfite pulp), NBSP (softwood bleached sulfite pulp), Stone Grand Pulp (SGP), Pressed Stone Grand Pulp (PGP), Refined Grand Pulp (RGP), Chemi Grand Pulp (CGP) , Thermo Grand Pulp (TGP), Grand Pulp (GP), Thermo Mecha-Cal Pulp (TMP), Chemi-thermo Mecha-Culp Pulp (CTMP), Refiner Mecha-Culp Pulp (RMP), etc., and deinked pulp (D IP)
- At least one selected from the group of used paper pulp strength can be blended at an arbitrary ratio and used as appropriate. In the present invention, in order to improve the full color suitability and improve the white
- mechanical pulp In order to improve air permeability, it is preferable to contain 10% or more of mechanical pulp per pulp weight. However, in terms of whiteness, mechanical pulp is preferably 60% by weight or less, more preferably 40% by weight or less. Among mechanical pulps, the contribution to low density is high, and it is preferable to use ground pulp.
- Fillers used for the base paper include heavy calcium carbonate, talc, magnesium carbonate, barium carbonate, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, clay, calcined kaolin, and delaminated.
- examples thereof include inorganic fillers such as kaolin, amorphous silicate, titanium dioxide, zinc oxide, silicon oxide, and amorphous silica, urea formalin resin, polystyrene resin, phenol resin, and fine hollow particles.
- Specific examples of amorphous silicates that are insoluble silicates include water-containing aluminum silicate, water-containing aluminum sodium silicate, water-containing calcium silicate, and water-containing magnesium silicate.
- fillers can be used, but from the viewpoint of improving the image quality and paper passing properties, it may contain 2 to 10% by weight of amorphous silicate as the filler content in the paper. I like it.
- the total filler content in the paper of the total filler is preferably 1 to 30% by weight, more preferably 3 to 25% by weight, and even more preferably 5 to 25% by weight. If it exceeds 30% by weight, the stiffness of the base paper will decrease, and not only the paper passing property in a copying machine etc. but also the handling workability will tend to be inferior.
- a light calcium carbonate Z-silica composite as a filler in addition to the filler.
- Use light calcium carbonate Z silica composite thus, the stiffness of Clark can be increased without increasing the basis weight.
- “light calcium carbonate Z-silica composite” means a surface of light calcium carbonate particles coated with silica, which is low density (bulky) and excellent in whiteness and opacity. Since the base paper containing this light calcium carbonate Z-silica composite as a filler has high rigidity, it is excellent in paper passing and workability in a copying machine or a laser beam printer.
- the light calcium carbonate Z-silica composite may be used alone or in combination with the above-described filler. However, the amount of the light calcium carbonate Z-silica composite is determined as the filler content in the paper.
- 1 to 25% by weight is preferred, and 3 to 25% by weight is more preferred.
- the most preferred content is 5 to 20% by weight.
- the filler content in the paper is less than 1% by weight, effects such as bulkiness and opacity are not sufficient.
- the filler content in the paper exceeds 25% by weight, the stiffness tends to decrease and the paper passing property tends to deteriorate.
- the method for producing a light calcium carbonate Z-silica composite used in the present invention includes a method of reacting a kaic acid in the process of producing calcium carbonate, and a method of reacting the surface of the produced calcium carbonate with the kaic acid. and so on.
- a method of reacting the surface of the produced calcium carbonate with caic acid is preferable from the viewpoint of improving the balance of quality such as bulkiness, opacity and rigidity. This method will be described below.
- light calcium carbonate is dispersed in water.
- the crystal form of the light calcium carbonate may be either calcite or aragonite.
- the shape may be any of acicular, columnar, spindle, spherical, cubic, amorphous, and rosetta types.
- Rosetta-type light calcium carbonate in particular, has a primary aggregate of spindle-shaped light calcium carbonate and agglomerated shape. It has a higher specific surface area and oil absorption than other light calcium carbonates. I like it because of its characteristics.
- the light calcium carbonate Z silica composite prepared using this Rosetta-type light calcium carbonate was used as a filler
- the light calcium carbonate Z silica composite prepared using another light calcium carbonate was used as the filler.
- the resulting electrophotographic transfer paper is excellent in bulkiness, opacity and rigidity, and improves paper passing properties.
- Light calcium carbonate may be used after being pulverized.
- the concentration of the light calcium carbonate in the reaction stock solution is preferably 1 to 20% by weight. Yes. This concentration is determined by taking into account the effect of the concentration of caustic acid because the blending ratio of light calcium carbonate and caic acid is important. If the concentration is less than 1% by weight, the productivity per batch will be small and the productivity will be poor. In addition, when the amount exceeds 20% by weight, the amount of alkali silicate used for the reaction is increased in proportion to the amount of light calcium carbonate used, which increases the viscosity during the reaction and increases the operability. Becomes worse.
- a caustic acid dissolved in an alkaline aqueous solution such as sodium or potassium.
- an alkaline aqueous solution such as sodium or potassium.
- Those used for industrial purposes are generally sodium thorium silicate and potassium silicate.
- the molar ratio of the caustic acid to the alkali may be arbitrary.
- O has a molar ratio of (3 to 3.4): 1 and is easily available.
- the weight ratio of the light calcium carbonate to the alkali silicate is adjusted so that it falls within the target range of the weight specific force of calcium carbonate and silica in the light calcium carbonate Z-silica composite.
- the solid weight ratio (CaCO 3 / SiO 2) between calcium carbonate and silica of the light calcium carbonate Z silica composite is preferably 30Z70 to 70Z30.
- the obtained slurry is stirred with an agitator, a homomixer, a mixer or the like to sufficiently disperse the slurry.
- an agitator a homomixer, a mixer or the like to sufficiently disperse the slurry.
- the mineral acid used in this case can be appropriately selected from known strengths.
- the mineral acid may contain an acid metal salt such as a sulfate band or magnesium sulfate. From the viewpoint of industrial mass production, it is preferable to use an acid that can be purchased relatively inexpensively, such as sulfuric acid and hydrochloric acid.
- an acid that can be purchased relatively inexpensively such as sulfuric acid and hydrochloric acid.
- sulfuric acid and hydrochloric acid When a high concentration of acid is used during neutralization, if the stirring is insufficient, a portion with low rhodium is formed due to the addition of acid, and light calcium carbonate is decomposed. In order to prevent this, it is necessary to use a homomixer or the like and stir vigorously at the acid addition port. On the other hand, if too dilute acid is used at the time of neutralization, the total capacity is extremely increased by the addition of acid, which is not preferable.
- the concentration of the acid used for neutralization is preferably 0.05 or more.
- the addition of the mineral acid and the aqueous acid metal salt solution to be added as necessary is alkaline. It is performed at a temperature below the boiling point of the mixture of the acid metal salt aqueous solution and light calcium carbonate. When the caustic acid content is precipitated by this neutralization treatment, the precipitated amorphous key acid coats the surface of the light calcium carbonate particles.
- the above acid addition may be performed in several steps. Aging may be performed after the addition of the acid. Aging means that the acid addition is temporarily stopped and left stirring. The shape of the particles may be controlled by vigorously stirring the slurry during ripening or grinding the agglomerated light calcium carbonate.
- the light calcium carbonate Z-silica composite produced in this manner is in the state of a suspension of light calcium carbonate particles whose surfaces are coated with silica.
- This suspension may be used as it is in the papermaking process, but the by-product salt remaining in the liquid is changed to a sparingly soluble metal salt such as calcium sulfate in the papermaking process.
- a sparingly soluble metal salt such as calcium sulfate in the papermaking process.
- the cake-like composite having a solid concentration of 10 to 50% by weight is re-dispersed using water or ethanol, and then solid-liquid separation is performed again to obtain light calcium carbonate Z silica composite. You can also get things.
- the average particle size of the light calcium carbonate Z-silica composite can also be adjusted by controlling the morphology of the particles by vigorous stirring and grinding during the aging of the slurry.
- the solid after the completion of the neutralization reaction, or the solid further solid-liquid separated after the completion of the neutralization reaction may be adjusted using a wet pulverizer so as to achieve the target average particle size.
- the average particle size of the light calcium carbonate Z silica composite used in the present invention is preferably 20 ⁇ m or less, particularly preferably 1 to 10 ⁇ m.
- an internal sizing agent can be used in addition to the knob and filler.
- sizing agents such as rosin sizing agents, synthetic sizing agents, petroleum oil sizing agents, and neutral sizing agents can be used.
- neutral sizing agents particularly alkyl ketene dimers and alkale succinic anhydride sizing agents.
- paper additive agents such as paper strength enhancers, dyes, pH control agents, antifoaming agents, and pitch control agents can be appropriately added according to the purpose.
- the base paper used in the present invention it is possible to make paper using a known apparatus such as a long net paper machine, an on-top twin-wire paper machine, or a gap former as appropriate.
- a known apparatus such as a long net paper machine, an on-top twin-wire paper machine, or a gap former as appropriate.
- the pulp beating degree, jet wire ratio, profile, press, carrier render, etc. are adjusted.
- various surface sizes such as starch, polybutyl alcohol, latex, maleic anhydride size, olefin type size, styrene monoacrylic acid type size are applied to the surface of the resultant paper in the size press process.
- a dimensional stabilizer such as an agent, ethylene urea resin, inorganic conductive agents such as sodium chloride, potassium chloride and sodium sulfate, organic conductive agents such as dimethylaminoethyl methacrylate, and surfactants.
- Application methods in the size press process include conventional size press (2 roll, pound method), gate tool size press, rod metering size press, metering blade type size press, bill blade, short dwell coater, etc. Can be used.
- a light calcium carbonate Z-silica composite is used as a filler, it is preferably a neutral paper having a papermaking pH of 6-9. This is because when the paper is made acidic, the light calcium carbonate inside the composite particles is decomposed or dissolved by the acid in the paper slurry. In addition, alkaline papermaking with a pH exceeding 9 is not preferable because the whiteness of the base paper is lowered.
- the transfer type electrophotographic transfer paper of the present invention is good in terms of color image quality and paper passing properties even at a low basis weight, so that the basis weight of the base paper is 30 gZm 2 to 200 gZm 2 . Can be used in a range.
- the basis weight is preferably 40 to: LOOgZm 2 and more preferably 50 to 85 gZm 2 . Furthermore, 50 ⁇ 75gZcm 2 der Rukoto is most preferred.
- At least one surface of the base paper has a volume reference of 0.
- Kaolin having a particle size distribution in which particles distributed in the range of 4 to 4.2 ⁇ m are 65% or more, and Z or an average particle size based on volume measured by laser diffraction method is 3.5 to 20 / ⁇
- the electrophotographic transfer paper of the present invention can be obtained by providing a coating layer containing a pigment containing 30 wt% or more of ⁇ delaminated clay and an adhesive.
- the smoothing process can be performed under a lower pressure condition than the normal calendar process.
- a coating layer with good coverage is uniformly present on the surface of the paper, and uneven charging is less likely to occur, so that it is excellent in toner transferability and fixability, as well as image density and gloss of the printed part. The degree is improved.
- the above-described excellent paper passing property, toner transfer property and fixing property can be obtained, and the image density and glossiness can be improved.
- kaolin having a particle size distribution of less than 65% in the range of 0.4 to 4.2 / zm is used, the print density, glossiness after printing, and paper passing properties of the resulting transfer paper are reduced. To do.
- the delaminated clay used in the present invention is obtained by peeling a normal clay laminated with hexagonal plate-like clay into a single layer (delamination). Since this delaminated tray has many particles with a relatively large particle size, a large particle size of the plate-shaped clay tends to be oriented on the surface of the coating layer, so that the coating amount on the base paper is relatively low. Even when coated, the base paper coverage is good. Therefore, since the smooth processing can be performed under a lower pressure condition than the normal calendar processing, it is possible to obtain a coated paper for electrophotography having a low density and good base paper coverage.
- the kaolin and the delaminated clay may be used alone or in combination. Further, the usage amount of the kaolin and Z or the delaminated clay needs to be 30 parts by weight or more per 100 parts by weight of the pigment in the coating layer, and more preferably 50 parts by weight or more. It is most preferable to add 60 parts by weight or more.
- the particle diameter in the present invention means a particle diameter measured on a volume basis using a laser diffraction method.
- kaolin and Z or delaminated clay in addition to the kaolin and Z or delaminated clay, kaolin having different particle size ranges, delaminated clay having different average particle sizes, clay, heavy calcium carbonate, light calcium carbonate, talc, titanium dioxide, sulfuric acid
- kaolin having different particle size ranges delaminated clay having different average particle sizes
- clay heavy calcium carbonate, light calcium carbonate, talc, titanium dioxide, sulfuric acid
- One or more conventionally used pigments such as barium, calcium sulfate, zinc oxide, key acid, key salt, colloidal silica, organic pigments such as satin white, and organic pigments such as plastic pigments. May be used in combination.
- Adhesives used in the pigment coating layer in the transfer paper of the present invention include styrene / butadiene, styrene / acrylic, ethylene / butyl acetate, butadiene / methyl methacrylate, butyl acetate / butyl acrylate.
- Synthetic adhesives such as polybutyl alcohol, maleic anhydride copolymer, acrylic acid 'methyl methacrylate copolymer, casein, soy protein, synthetic protein proteins , Oxidized starch, positive starch, urea phosphated starch, etherified starch such as hydroxyethyl etherified starch, starches such as dextrin, cellulose derivatives such as carboxyethyl cellulose, hydroxyethyl cellulose and hydroxymethylcellulose Etc., publicly known At least one selected from the above adhesives for coated paper is used. These binders are preferably used in an amount of 5 to 50 parts by weight per 100 parts by weight of the pigment, and particularly preferably 5 to 25 parts by weight. In addition, as required, various auxiliary agents to be added to ordinary coated paper coating compositions such as dispersants, thickeners, water retention agents, antifoaming agents, water resistance agents, colorants, and printability improvers. Are used as appropriate.
- the maximum value of the charged voltage when a voltage of lOkv is applied in an atmosphere of 23 ° C and 50% RH is 0.25 seconds or less, more preferably 0.20 seconds or less, the chargeability can be made favorable.
- the charging property suitable the paper passing property and the image quality are also improved.
- the conductive agent include sodium salt, sodium salt, potassium salt, calcium salt, magnesium chloride, sodium carbonate, sodium hydrogen carbonate, sodium sulfate, sodium aluminate, sodium phosphate and other inorganic salts, and formic acid.
- Organic salts such as potassium and sodium odorate, surfactants such as sarcophagus, phosphate and carboxylate, polymer electrolytes such as quaternary ammonium salt, polyacrylate and styrenemaleic acid
- an inorganic salt such as sodium chloride, sodium carbonate, or sodium bicarbonate.
- a coating liquid containing a pigment having a specific particle size distribution, an adhesive, and, if necessary, an auxiliary agent or a conductive agent is applied to at least one surface of the base paper. Apply to.
- the solid content concentration of the coating liquid in the present invention is preferably 45 to 70% by weight from the viewpoint of image quality and coating suitability.
- two roll size press coaters, gate roll coaters, blade metering size press coaters, and rod metering size press presses are used.
- Film transfer type roll coater such as 1 turter, shimsizer, etc., Hradet nip Z blade coater, jet fountain Z blade coater, short dwell time applicate type coater Rod metallin using rods, etc.
- There are methods using a known coater such as a gucoater, curtain coater, or die coater.
- the pigment coating layer provided on the base paper can be provided as a single layer or two or more layers on one side or both sides of the base paper.
- the coating amount of the present invention from the viewpoint of printability and sheet passing property, it is more favorable preferable is the preferred instrument particularly 5 ⁇ 9GZm 2 it is per side 2 ⁇ 15gZm 2.
- various types of dryers such as a heated hot air air dryer, a heating cylinder, a gas heater dryer, an electric heater dryer, and an infrared heater dryer can be used alone or in combination.
- a heated hot air air dryer a heating cylinder
- a gas heater dryer a gas heater dryer
- an electric heater dryer a heater dryer
- an infrared heater dryer can be used alone or in combination.
- the smoothness of the coated paper obtained as described above can be increased by performing a calendar process.
- the calendering process is usually performed by using a super calender, dalos calender, soft calender, etc., or a combination thereof, which is used for smoothing the coated paper. Since it is good, the smoothing process can be performed under a lower pressure condition than the normal calendar process. In order to achieve a good balance between image quality and paper passing property, it is preferable to perform a soft calendar process. In addition, it is preferable to set the processing temperature of the metal roll at 100 ° C. or higher in the calendar process in order to reduce the clark stiffness of the transfer paper and improve the paper passing property and image quality. A power of 150 to 250 ° C. S is preferable. Further, the calendar linear pressure is preferably 10 to 200 kg / cm, and more preferably 10 to 100 kgZcm.
- the maximum value of the charged voltage is attenuated to 1 Z2 when a voltage of 1 Okv is applied to the transfer paper surface in an atmosphere of 23 ° C and 50% RH.
- the time required for this is 0.25 seconds or less, it is possible to improve the image quality and paper passing performance.
- the decay time is long, two or more transfer sheets are fed simultaneously at the time of feeding due to residual static electricity, and double feeding is likely to occur.
- the transfer paper tends to stick to the photosensitive drum and image defects due to partial scattering of toner tend to occur.
- a conductive agent is added to the coating layer, or a conductive pigment is used. These methods can be used alone or in combination.
- the electrophotographic transfer paper of the present invention is a CD-direction paper.
- one click stiffness is required to be 20 ⁇ 80cm 3 Zl00, more preferably it is preferred tool in a range of 30 ⁇ 80cm 3 Zl00, a 35 ⁇ 60cm 3 ZlOO.
- the electrophotographic transfer paper of the present invention has a large curl shape with the MD (longitudinal direction of A4 paper) as an axis when measuring the hanging curl of A4 size paper in the state shown in FIG.
- MD longitudinal direction of A4 paper
- CD A4 paper's short direction
- the curl can be adjusted by adjusting, for example, paper making conditions, drying conditions, and calendar processing conditions.
- DocuPrintC3530 manufactured by Fuji Xerox Co., Ltd.
- the images used were black, cyan, magenta, and yellow solid prints.
- the printed part was measured using a Macbeth densitometer RD-191 manufactured by Daletag.
- the printed part was measured for 75 degree glossiness using a gloss meter GM26D manufactured by Murakami Color Co., Ltd.
- A4 paper was hung as shown in Fig. 1, and the distance shown in the figure was measured and curled.
- STATIC HONESTMETER (TYPE H-0101) manufactured by Shishido Shokai Co., Ltd. After charging the sample surface with a voltage of lOkv for 30 seconds at 23 ° C and 50% RH, the charged potential was 1Z2 The time required to decay was measured.
- the composition of the pulp composing the base paper is 30% by weight of softwood bleached kraft pulp (NBKP), 40% by weight of hardwood bleached kraft pulp (LBKP), 30% of SGP, and as a filler, hydrous aluminum silicate per paper weight 4% by weight, 6% by weight of talc, and 0.2% by weight of rosin sizing agent as internal sizing agent and 1.0% by weight of sulfuric acid band as fixing agent to prepare pulp slurry did.
- the obtained pulp slurry was used to produce a base paper having a basis weight of 58 g / m 2 .
- kaolin force Pim DG: manufactured by Imeris Co., Ltd., volume distribution particle size 0.4 to 4.2 m: 68. 4%) 70 parts by weight, coarse-grained heavy calcium carbonate (FMT-75: manufactured by Pfematec Co., Ltd., volume ratio of 0.4 to 4.2 m particle size distribution: 69.5%) 30 parts by weight
- FMT-75 coarse-grained heavy calcium carbonate
- FMT-75 volume ratio of 0.4 to 4.2 m particle size distribution: 69.5%
- the blade coater Using the blade coater, apply the above coating liquid at a coating speed of 800 mZ on both sides of the base paper so that the coating amount per side is 7 gZm 2, and pass it through a skiff dryer. After that, it was dried using a cylinder dryer so that the moisture in the paper was 5.5% by weight.
- the pigment composition of the coating solution is 50 parts by weight of kaolin (force Pim DG: manufactured by Imeris Co., Ltd., 0.4 to 4.2 ⁇ m particle size distribution ratio: 68.4%) and coarse particles Heavy calcium carbonate (FMT—75: manufactured by Pfematec Co., Ltd., volume ratio: 0.4 to 4.2 / zm, particle size distribution ratio: 69.5%)
- kaolin force Pim DG: manufactured by Imeris Co., Ltd., 0.4 to 4.2 ⁇ m particle size distribution ratio: 68.4%
- FMT—75 manufactured by Pfematec Co., Ltd., volume ratio: 0.4 to 4.2 / zm, particle size distribution ratio: 69.5%
- the pigment composition of the coating solution was changed to kaolin (force Pim DG: made by Imeris, 0.4 to 4.2 ⁇ m on a volume basis). Ratio of particle size distribution of m: 68.4%) 65 parts by weight and coarse heavy calcium carbonate (FMT—75: manufactured by Pfematec Co., Ltd. Volume ratio of particle size distribution of 0.4 to 4.2 / zm on a volume basis: 69. 5%) An electrophotographic transfer paper of the present invention was obtained in the same manner as in Example 1, except that the content was changed to 35 parts by weight and no sodium chloride salt was added.
- Example 2 instead of the kaolin (force Pim DG) used in Example 1, Miracene: Kaolin made by Engelnode Co. (percentage of particle size distribution of 0.4 to 4.2 m on a volume basis: 60.2%) A comparative electrophotographic transfer paper was obtained in the same manner as in Example 1 except for the above.
- kaolin force Pim DG
- Miracene Kaolin made by Engelnode Co. (percentage of particle size distribution of 0.4 to 4.2 m on a volume basis: 60.2%)
- a comparative electrophotographic transfer paper was obtained in the same manner as in Example 1 except for the above.
- An electrophotographic transfer paper having a CD stiffness of 17 cm 3 Zl00 was obtained in the same manner as in Example 1 except that the basis weight of the base paper was 39 gZm 2 .
- An electrophotographic paper (brand name: ST), which is a designated paper of the Fuji Xerox electrophotographic copying machine DocuT ec hl35, was used.
- the transfer paper for electrophotography was excellent in image quality with high color image density and gloss, in addition to good continuous paper-passability.
- the image density and the glossiness of the image area are inferior
- the image density and the continuous paper passing property are inferior
- the image density and the image area are inferior. It was confirmed that the glossiness was inferior.
- the pulp composition constituting the base paper, NBKP30 weight 0/0, LBKP40 weight 0/0, and SGP30 4% by weight of hydrated aluminum silicate and 6% by weight of tartar are added as filler, and rosin sizing agent is 0.2% by weight as an internal sizing agent, and a sulfuric acid band is used as a fixing agent.
- a pulp slurry was prepared by adding 0% by weight. The obtained pulp slurry was used to produce a base paper having a basis weight of 58 g / m 2 .
- Delaminated clay As a pigment, Delaminated clay (Power Pim CC: made by Imeris Co., Ltd., volume-based average particle size: 4.9 m) 70 parts by weight and coarse heavy calcium carbonate (FMT-75: made by PMMA Tech, volume-based) (Average particle size 0.95 m)
- FMT-75 coarse heavy calcium carbonate
- Add 30 parts by weight of poly (sodium polyacrylate) as a dispersant to 100 parts by weight of pigment add water to the pigment, add water, and use a scheme mixer. A pigment slurry having a solid content concentration of 70% by weight was prepared.
- the pigment composition of the coating liquid was adjusted to 50 parts by weight of delaminated clay (Power Pim CC: IMERIS, volume-based average particle size 4.9 m) and coarse heavy calcium carbonate (FMT-75: Faimate)
- An electrophotographic transfer paper was obtained in the same manner as in Example 4 except that the volume average particle size (0.95 m) manufactured by Cook was changed to 50 parts by weight.
- the pigment composition of the coating liquid was adjusted to 65 parts by weight of delaminated clay (Power Pim CC: IMERIS, volume-based average particle size 4.9 m) and coarse heavy calcium carbonate (FMT-75: The volume average particle size (0.95 m) manufactured by K. Co., Ltd. Obtained.
- the pigment composition of the coating solution was adjusted to 25 parts by weight of delaminated clay (Power Pim CC: Imeris, volume-based average particle size of 4.9 m) and coarse heavy calcium carbonate (FMT-75: manufactured by Huay Matec).
- An electrophotographic transfer paper was obtained in the same manner as in Example 4 except that the volume-based average particle size was 0.95 m) and was changed to 75 parts by weight.
- Example 4 instead of the large particle size delaminated clay used in Example 1 (force Pim CC: volume average standard particle size 4.9 m manufactured by Imeris), delaminated clay (Nu-Clay: volume standard manufactured by Engelhard) An electrophotographic transfer paper was obtained in the same manner as in Example 4 except that the average particle size of 2.4 m) was used.
- An electrophotographic transfer paper was obtained in the same manner as in Example 4 except that the coated paper was calendered at 200 ° C. and a calendar linear pressure of 300 kgZcm.
- Example 46 The transfer papers of Example 46 and Comparative Example 46 were evaluated in the same manner as in Example 1. The results are shown in Table 2.
- a part of the obtained light calcium carbonate Z-silica composite A was redispersed in ethanol to about 10%, filtered again, dried at 105 ° C using a dryer, and oil absorption A powder sample for measuring the quantity and BET specific surface area was used.
- the average particle diameter was 3.4 m
- the oil absorption was 159 mlZl00 g.
- the average particle size of the commercially available Rosetta-type light calcium carbonate used as the core was 3.
- the oil absorption was 119 mlZlOOg.
- a norp mixed with 30 parts by weight of NBKP, 40 parts by weight of LBKP, and 30 parts by weight of SGP is used.
- Manufactured by Nippon Sci Co., Ltd. per 1.0% pulp, respectively, 1.0% by weight and 0.8% by weight cationic polyacrylamide as a yield improver, 0.02% by weight per pulp, Using a slurry to which acrylamide was added to 0.01% by weight per pulp, light calcium carbonate Z silica composite A was added so that the filler content in paper was 5% by weight, and talc was added so that the filler content in paper was 5% by weight. Paper was made using an on-top twin wire single paper machine.
- kaolin force Pim DG: manufactured by Imeris Co., Ltd., volume-based average particle size 0.4 to 4.2 ⁇ m: 68.4% by weight
- FMT-75 coarse heavy calcium carbonate
- FMT-75 phi Made by Matec Co., Ltd. Volume-based average particle size 0.95 m
- the light calcium carbonate Z silica composite A used in the base paper of Example 7 was used, and the pigment composition of the coating solution was changed to kaolin (force Pim DG: Imeris, volume ratio 0.4 to 4.2 / zm particle size distribution ratio: 68. 4%) 50 parts by weight and coarse heavy calcium carbonate (FMT-75: manufactured by Pfematec, volume basis (Percentage of particle size distribution of 0.4 to 4.2 m: 69.5%)
- FMT-75 manufactured by Pfematec, volume basis (Percentage of particle size distribution of 0.4 to 4.2 m: 69.5%)
- An electrophotographic transfer paper was obtained in the same manner as in Example 7 except that the amount was changed to 50 parts by weight.
- the pigment composition in the coating solution used in Example 7 was mixed with 50 parts by weight of delaminated clay (force Pim CC: manufactured by Y Meris, volume-based average particle size 4.9 m) and coarse particle weight.
- the pigment composition in the coating liquid used in Example 9 was changed to 65 parts by weight of delaminated clay (force Pim CC: manufactured by Y Meris, volume-based average particle size 4.9 m) and coarse particle weight.
- Example 9 instead of the delaminated clay used in Example 9 (force Pim CC: manufactured by Imeris, volume-based average particle size 4.9 m), delaminated clay (Nu—Clay: manufactured by Engelhard, volume-based) An electrophotographic transfer paper was obtained in the same manner as in Example 9 except that an average particle size of 2.4 ⁇ ) was used.
- the transfer sheet for electrophotography of the present invention satisfies the continuous paper passing property in a sheet high-speed copying machine and printer, particularly of the electrophotographic system, and has excellent performance in terms of color printability. Since it is useful for text papers, it has high industrial applicability.
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- General Physics & Mathematics (AREA)
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/576,430 US20080096008A1 (en) | 2004-09-30 | 2005-09-29 | Electrophotographic Transfer Paper |
EP05787589A EP1795970B1 (en) | 2004-09-30 | 2005-09-29 | Electrophotographic transfer paper |
JP2006537807A JPWO2006035878A1 (ja) | 2004-09-30 | 2005-09-29 | 電子写真用転写紙 |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-289221 | 2004-09-30 | ||
JP2004289221 | 2004-09-30 | ||
JP2005-227079 | 2005-08-04 | ||
JP2005227079 | 2005-08-04 |
Publications (1)
Publication Number | Publication Date |
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WO2006035878A1 true WO2006035878A1 (ja) | 2006-04-06 |
Family
ID=36119023
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/017966 WO2006035878A1 (ja) | 2004-09-30 | 2005-09-29 | 電子写真用転写紙 |
Country Status (4)
Country | Link |
---|---|
US (1) | US20080096008A1 (ja) |
EP (1) | EP1795970B1 (ja) |
JP (1) | JPWO2006035878A1 (ja) |
WO (1) | WO2006035878A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008040297A (ja) * | 2006-08-09 | 2008-02-21 | Nippon Paper Industries Co Ltd | 電子写真用転写紙 |
JP2012172287A (ja) * | 2011-02-24 | 2012-09-10 | Nippon Paper Industries Co Ltd | 紙の製造方法 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7611606B2 (en) * | 2004-03-30 | 2009-11-03 | Nippon Paper Industries Co., Ltd. | Low-density neutral paper |
US9637864B2 (en) | 2013-04-26 | 2017-05-02 | Pacific Nano Products, Inc. | Fibrous structured amorphous silica including precipitated calcium carbonate, compositions of matter made therewith, and methods of use thereof |
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- 2005-09-29 US US11/576,430 patent/US20080096008A1/en not_active Abandoned
- 2005-09-29 EP EP05787589A patent/EP1795970B1/en not_active Expired - Fee Related
- 2005-09-29 WO PCT/JP2005/017966 patent/WO2006035878A1/ja active Application Filing
- 2005-09-29 JP JP2006537807A patent/JPWO2006035878A1/ja active Pending
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JP2008040297A (ja) * | 2006-08-09 | 2008-02-21 | Nippon Paper Industries Co Ltd | 電子写真用転写紙 |
JP2012172287A (ja) * | 2011-02-24 | 2012-09-10 | Nippon Paper Industries Co Ltd | 紙の製造方法 |
Also Published As
Publication number | Publication date |
---|---|
EP1795970A1 (en) | 2007-06-13 |
US20080096008A1 (en) | 2008-04-24 |
EP1795970B1 (en) | 2012-04-04 |
EP1795970A4 (en) | 2010-04-28 |
JPWO2006035878A1 (ja) | 2008-05-15 |
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