JP2007139825A - Electrophotographic transfer paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide electrophotographic transfer paper which is high in yield of an ash content during paper making even if highly compounded with a filler, is hardly degraded in the durability of paper and stiffness despite of higher compounding with the filler and higher bulking of paper, is excellent in print traveling property without jam trouble and paper powder trouble within a copying machine, further has reduce printing through and gives excellent print quality. <P>SOLUTION: The electrophotographic transfer paper is formed by setting a surface treating agent on raw paper which contains the filler prepared by surface treating inorganic particles of 0.1 to 30 μm average particle size by a cationic compound and starch other than the cationic compound and has a filling rate in the paper of 5 to 40 wt.% by solid content. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electrophotographic transfer paper that has a high filler yield during papermaking, is free from jam troubles and paper dust troubles in a copying machine, has excellent print running properties, and has excellent print quality with little show-through.

  In recent years, due to the increasing awareness of environmental protection and the reduction of paper manufacturing costs, the blending and bulking of electrophotographic transfer papers such as PPC paper and laser beam printer paper have been increased in order to reduce the amount of pulp used. It is progressing. However, in the high-filler paper, the pulp content is reduced and the increase in the inhibition of the inter-fiber binding by the filler, and in the bulk paper, the inter-fiber binding of the pulp is weakened due to the lower density. The paper strength such as the tensile strength and interlayer strength of the paper and the stiffness such as bending stiffness and waist may be lowered, which may cause a problem in quality.

  Also, electrophotographic transfer paper has a very low ash yield at the time of paper making due to the high speed of paper machines and double-sided dewatering in addition to high fillers and high recycled paper pulp.

  On the other hand, in terms of quality, the most important quality is that it can withstand the use of copying machines and laser beam printers that are printed using the electrophotographic printing method, and the requirements for post-copy curling and bending stiffness related to jam trouble are extremely severe. . Recently, since printing for a long time is increasing, problems such as image defects due to paper dust accumulation are also regarded as important. Recently, in addition to the quality related to running performance, the use of double-sided printing has been increasing, so the level of demand for the phenomenon that the image can be seen through from the opposite side, the so-called show-through, has been increasing year by year. .

  It is known that increasing the opacity of paper is the most effective way to improve the printing surface of electrophotographic transfer paper and to reduce back-through. As a method for increasing the opacity of paper, it is effective to increase the ash content in the paper by blending a filler having a high specific scattering coefficient and a large effect of increasing opacity. The increase in paper filler further improves the smoothness and reduces curl after copying. However, with electrophotographic transfer paper, increasing the paper filler significantly reduces the ash yield during papermaking and is stable. There are problems that operation becomes difficult, paper dust generated in the copying machine increases due to high filler, and jam trouble increases due to a decrease in bending stiffness.

  Also, paper bulking agents have attracted attention as a technology for reducing the density of paper. Most of these bulking agents for paper are designed to reduce the density of the paper by interposing between the pulp fibers and inhibiting the interfiber bonding of the pulp. Although the use of paper can reduce the density of the paper, there is a problem in that the paper strength and rigidity are lowered.

  As a method for increasing the paper strength such as tensile strength and interlaminar strength and bending stiffness and stiffness of the electrophotographic transfer paper by using papermaking chemicals, a method of internally adding a paper strength enhancer such as polyacrylamide or starch is generally used. However, in order to obtain a sufficient paper strength and rigidity improvement effect, an addition amount more than usual is required, which tends to cause deterioration of the paper formation, and may reduce the paper strength and stiffness. In addition, it is considered that adding these chemicals having cohesiveness and adhesiveness to the papermaking process may cause unstable operation, and that adding chemicals is difficult from the viewpoint of cost.

  There is known a method for providing an effect obtained by adding and mixing chemicals to inorganic particles such as calcium carbonate, silica, titanium oxide, and clay. For example, a method for producing calcium carbonate that does not dissolve even in acidic papermaking by mixing fatty acid with calcium carbonate (see Patent Document 1), and calcium carbonate that does not dissolve in acidic papermaking by mixing oxalic acid or stearic acid with calcium carbonate. A method for producing (see Patent Document 2), a method for improving sizing by mixing a cationic polymer as a sizing agent with calcium carbonate (see Patent Document 3), and 0.1% to 1% anionic property in an inorganic filler A method of improving sizing by mixing a substance and a cationic polymer that is a sizing agent of 0.1% to 10% (see Patent Document 4), and improving sizing by mixing fatty acid and starch in calcium carbonate A method (see Patent Document 5), a method for improving sizing by mixing a fatty acid with calcium carbonate or titanium oxide (see Patent Document 6), calcium carbonate A method of reducing friction coefficient by mixing long chain aliphatic amines with pigments, silica, kaolin, etc. (see Patent Document 7), and a method of improving sizing by mixing acrylonitrile copolymer with calcium carbonate ( Patent Document 8), and a method (see Patent Document 9) used as a drainage / retention aid by mixing polyvinylamine with calcium carbonate or bentonite. However, these methods are intended to stabilize calcium carbonate when acidic, improve size, and change the friction coefficient, and are not methods for improving paper strength and rigidity.

  On the other hand, as a technique for improving the paper strength by adding chemicals to inorganic particles, a method of mixing carboxymethyl cellulose or xanthan gum with calcium carbonate (see Patent Document 10), starch powder is mixed with the inorganic particle slurry. Although a method of heating and gelling to make a composite (see Non-Patent Document 1) has been disclosed, it is still insufficient in terms of cost, effect, and practicality, and a more effective paper strength and stiffness improvement method is available. It has been demanded.

U.S. Patent No. 1839449 JP 59-228098 U.S. Pat.No. 5,147,507 Japanese National Patent Publication No. 10-505883 U.S. Pat.No. 5,541,212 Japanese National Patent Publication No. 08-507837 JP-T 09-504057 Special Table 2002-520504 Japanese Patent Laid-Open No. 08-188983 JP-T 09-5066397 Yulin Zhao et.al., Tappi Journal, 3,40 (2), 2005. As described above, even when a high amount of filler is added, the yield of the filler during papermaking is high, and the higher the amount of filler and the bulk of the paper. Nevertheless, there is little decrease in paper strength and stiffness, high yield of filler during papermaking, no trouble in jams and no paper dust in the copier, excellent print running performance, and excellent print quality with little show-through. The development of photographic transfer paper has been desired.

  The problem to be solved by the present invention is that even if the filler is highly blended, the yield of the filler during papermaking is high, and despite the high blending of the filler and the bulk of the paper, there is little decrease in paper strength and stiffness, It is another object of the present invention to provide an electrophotographic transfer paper which is free from jam trouble and paper dust trouble in the copying machine, has excellent print running properties, and has excellent print quality with little show-through.

The surface of a base paper having an average particle size of 0.1 to 30 μm and containing a filler that has been surface-treated with a cationic compound and starch other than the cationic compound, and the filler content in the paper is 5 to 40% solids by weight. An electrophotographic transfer paper provided with a treatment agent.
In addition, a filler slurry consisting of inorganic particles having an average particle size of 0.1 to 30 μm, a cationic compound, and a starch paste solution other than the cationic is added to the paper to make paper, and the filler content in the paper is 5 to 40% by weight This is a method for producing an electrophotographic transfer paper in which a surface treatment agent is applied to the base paper.

In general, an interaction such as hydrogen bonding does not work between the inorganic particles and the pulp fibers, and the inorganic particles interposed between the pulp fibers inhibit the hydrogen bonding between the pulp fibers. For this reason, the greater the amount of inorganic particles internally added to the paper, the lower the paper strength and stiffness. However, in the present invention, the following remarkable effects can be obtained by internally adding a filler slurry comprising inorganic particles, a cationic compound, and a starch paste solution to the paper material and making paper for electrophotography.
(1) By mixing inorganic particles, a cationic compound, and starch paste liquid, a composite in which these inorganic particles are used as a core and the surface thereof is coated with a complex of a cationic compound and starch can be obtained. When this paper is added internally, the composite is easily fixed on the pulp fiber as a filler by the action of the complex of the cationic compound and starch, so that the filler yield on the wire is improved.
(2) In addition, the amount of cationic compounds and starch in the paper increases, and inorganic particles coated with the complex of cationic compounds and starch can be bonded to pulp fibers, thereby increasing the blending of fillers. In addition, there is little decrease in paper strength and rigidity despite the increase in bulk of electrophotographic transfer paper due to the internal use of a bulking agent for paper. The electrophotographic transfer paper containing inorganic particles coated with the cationic compound and starch complex of the present invention is paper rather than paper made by adding inorganic particles, cationic compound and starch paste separately to pulp. The force and stiffness are significantly improved.
(3) This improvement in paper strength and stiffness reduces the occurrence of jams and paper dust when used in a copier or laser beam printer.
(4) It is possible to increase the filler content in the paper while suppressing the decrease in paper strength and rigidity by adding a high composite of inorganic particles as the core and the surface coated with a complex of a cationic compound and starch. Thus, the opacity is improved.

  In the present invention, a filler slurry comprising inorganic particles having an average particle size of 0.1 to 30 μm, a cationic compound, and starch paste other than the cationic compound is added to the paper, and the filler content in the paper is 5 to 40 solids by weight% The base paper is made, and a surface coating agent is applied to the base paper to obtain an electrophotographic transfer paper.

  Inorganic particles having an average particle size of 0.1 to 30 μm used in the present invention are clay, calcined kaolin, deramikaolin, titanium dioxide, zinc oxide, silicon oxide, amorphous silica, heavy calcium carbonate, light calcium carbonate, magnesium carbonate , Barium carbonate, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide, etc., as long as they are conventionally used as fillers for papers or pigments for coated papers, there is no limitation. More than one type can be used in combination. Among these, heavy calcium carbonate and light calcium carbonate are preferable. That is, the neutral papermaking method is suitable as the papermaking method.

  The cationic compound used in the present invention includes cationized starch, polyamine epichlorohydrin, polyamide epichlorohydrin, polyvinylamine, a homopolymer of diallyldimethylammonium chloride, a copolymer of diallyldimethylammonium chloride and acrylamide, polyethyleneimine , Selected from the group of polyaluminum chloride and sulfuric acid band. These are used in the form of aqueous solutions or emulsions. These 1 type, or 2 or more types of mixed liquids can be used. The raw material of the cationized starch is not limited, and raw material starches such as corn, waxy maize, tapioca, sweet potato, potato, wheat and rice can be used. The cationic group may be a tertiary amine group or a quaternary ammonium group, and the degree of substitution (D.S.) is not limited.

  The starch paste used in the present invention is selected from the group of oxidized starch, urea-phosphorylated starch, hydroxyethylated starch, amphoteric starch, acetylated starch, and raw starch, and one or more of these are selected. A mixed paste can be used. The raw materials for these starches are not limited, and starches such as corn, waxy maize, tapioca, sweet potato, potato, wheat, rice, etc. can be used. Further, there is no limitation on the degree of substitution of these ether groups and ester groups.

In the present invention, a filler slurry is prepared by mixing inorganic particles having an average particle size of 0.1 μm to 30 μm, a cationic compound, and starch paste under stirring. The order of addition of the inorganic particles, the cationic compound, and the starch paste at the time of mixing is not particularly limited, and for example, the following various addition orders can be employed.
(1) Add 1) the slurry of inorganic particles in the order of 2) an aqueous solution or emulsion of a cationic compound, and 3) starch paste.
(2) 1) Add to the slurry of inorganic particles in the order of 2) starch paste and 3) cationic compound.
(3) 1) Add to aqueous solution or emulsion of cationic compound in order of 2) slurry or powder of inorganic particles, 3) starch paste.
(4) Add 1) an aqueous solution or emulsion of a cationic compound in the following order: 2) starch paste, 3) slurry or powder of inorganic particles.
(5) Add 1) a slurry or powder of inorganic particles and 3) an aqueous solution or emulsion of a cationic compound to the starch paste solution in this order.
(6) To 1) the inorganic particle slurry, 2) an aqueous solution or emulsion of a cationic compound and a starch paste solution mixed in advance.
(7) Add 1) slurry or powder of inorganic particles in the order of 1) an aqueous solution or emulsion of a cationic compound and a starch paste solution.

  The mixing ratio of the inorganic particles, the cationic compound, and the starch paste is a solid weight ratio, and is in the range of inorganic particles / cationic compound / starch = 100 / 0.1 / 0.1 to 100/100/100, preferably 100 / 0.1 /0.1 to 100/50/100, more preferably 100 / 0.1 / 1 to 100/10/50. When the addition amount of the cationic compound and / or starch is less than 0.1% by weight, the yield improvement effect of the composite as a filler is small, and further, the effect of improving the paper strength and the rigidity cannot be obtained, exceeding 100% by weight. Even if added, the effect reaches a peak, which is uneconomical.

  The apparatus for preparing the filler slurry by mixing the inorganic particles, the cationic compound, and the starch paste solution is not particularly limited as long as it can sufficiently stir and mix these. Mixing is between several minutes to several tens of minutes. The solid content concentration of the slurry at the time of mixing is not particularly limited, but is preferably 80% by weight or less, more preferably 70% by weight or less. The mixing temperature is preferably 10 to 50 ° C.

  The filler slurry of the inorganic particles, the cationic compound, and the starch paste solution may be temporarily stored and then added to the paper material, or may be added continuously immediately after mixing. The addition place should just be a place where the filler is normally added, and it adds between a mixer and a head box.

  In paper machines, white water dehydrated in wire parts is being collected and reused in paper machines with the aim of saving water and heat energy. If present, the slime will propagate using this as a nutrient source, the slime layer adhering to the white water wall surface will fall off and be incorporated into the paper, resulting in paper defects such as foreign matter, and this may cause paper breaks during paper making May cause problems. In the present invention, since a large amount of starch is used for the treatment of inorganic particles, it is also considered that a problem of slime reproduction occurs. In order to avoid this, it is desirable to remove as much as possible the cationic compound and starch paste that are not firmly adsorbed on the inorganic particles, and the prepared filler slurry comprising the inorganic particles, the cationic compound, and the starch paste is filtered or filtered. The separated water can be separated by centrifugation, and the separated water can be drained out of the paper machine system, and the resulting dewatered cake can be redispersed in water, and then this dispersed slurry can be added to the paper stock.

  The content of the inorganic particles in which the cationic compound and starch are mixed in the paper is in the range of 5 to 40 solids by weight, preferably 10 to 35 solids, and more preferably 10 to 30 solids. When the solid content is less than 5% by weight, the amount of inorganic particles that hinder hydrogen bonding between pulp fibers is small, so that paper having high paper strength and rigidity can be obtained without coating treatment as in the present invention. Therefore, even if the mixed slurry comprising the inorganic particles, the cationic compound, and the starch paste of the present invention is added as a filler, the effect of improving the paper strength and rigidity of the present invention is small. On the other hand, if it exceeds 40% by weight, the effects of improving the paper strength, rigidity and opacity of the present invention can be obtained, but there is a problem that papermaking itself becomes difficult.

  Inorganic particles treated with a cationic compound and starch paste solution are added to the stock as a filler and incorporated into the paper to obtain a base paper for electrophotographic transfer paper. The composition ratio of the inorganic particles present in the paper Is in the range of inorganic particles / cationic compound / starch = 100 / 0.05 / 0.05 to 100/90/90, and its presence can be easily confirmed by analyzing the composition of the inorganic particles in the paper. . As a method of separating the inorganic particle / cationic compound / starch composition from the paper, for example, the paper is disaggregated in a solvent that does not dissolve the cationic compound and starch, and then the pulp and the inorganic particles are separated by specific gravity. The method of separating based on the above can be mentioned. The inorganic particles separated from the paper by such a method adsorb cationic compounds and starch. By quantifying the amount of inorganic particles, cationic compounds, and starch in the separated inorganic particles, the inorganic particles / The composition ratio of the cationic compound / starch can be determined. The method for quantifying the inorganic particles, the cationic compound, or the starch may be any method that allows quantification with high accuracy, and a known quantification method may be employed.

  The raw material pulp used in the present invention may be any pulp that is usually used for electrophotographic transfer paper, and is not particularly limited. Chemical pulp (CP), groundwood pulp (GP), chemiground pulp (CGP), Refiner ground pulp (RGP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), pulp of various production methods such as semi-chemical pulp (SCP), and these softwood, hardwood pulp, bleached, unbleached Pulp and pulp obtained by appropriately blending deinked pulp (DIP) or the like according to the type of paper.

  If necessary, known internal sizing agents such as alkyl ketene dimer (AKD) sizing agents, alkenyl succinic anhydride (ASA) sizing agents, and neutral rosin sizing agents can be used.

  When making a base paper for electrophotographic transfer paper, various conventional nonionic and cationic retention agents, freeness improvers, paper strength improvers, and other internal additives for papermaking are used as necessary. It is appropriately selected and used. Further, for example, sulfuric acid bands, aluminum chloride, sodium aluminate, basic aluminum compounds such as basic aluminum chloride and basic polyaluminum hydroxide, water-soluble aluminum compounds such as water-degradable alumina sol, sulfuric acid A polyvalent metal compound such as ferrous sulfate or ferric sulfate, silica sol, or the like may be internally added. Other starches for papermaking, various starches, polyacrylamide, urea resin, melamine resin, epoxy resin, polyamide resin, polyamide, polyamine resin, polyamine, polyethyleneimine, vegetable gum, polyvinyl alcohol, latex, polyethylene oxide, hydrophilic cross-linked polymer Various compounds such as particle dispersions and derivatives or modified products thereof can be used. Furthermore, internal additives for papermaking such as dyes, fluorescent brighteners, pH adjusters, antifoaming agents, pitch control agents, slime control agents and the like can be appropriately added depending on the intended use.

  In recent years, a technology for increasing the bulk (lowering density) of paper by adding a bulking agent for paper has been developed. Most of these bulking agents lower the paper strength and stiffness of paper. When the present invention is applied to a bulky paper containing such a bulking agent and having reduced paper strength and stiffness, the paper strength and stiffness are reduced. The effect of grant is great.

  The electrophotographic transfer paper containing the paper bulking agent will be described. The bulking agent is internally added to the stock. Specific examples of this bulking agent include oil-based nonionic surfactants, sugar alcohol-based nonionic surfactants, sugar-based nonionic surfactants, polyhydric alcohol-type nonionic surfactants, polyhydric alcohols and Fatty acid ester compound, higher alcohol or polyoxyalkylene adduct of higher fatty acid, polyoxyalkylene adduct of higher fatty acid ester, polyoxyalkylene adduct of polyhydric alcohol and fatty acid ester compound, fatty acid polyamidoamine, linear fatty acid Examples include monoamides and unsaturated fatty acid diamidoamines.

  This bulking agent is exemplified in the patent literature as follows. Paper bulking agent described in Japanese Patent No. 3128248, paper bulking agent described in Japanese Patent No. 3453505, paper bulking agent described in Japanese Patent No. 3482336, paper bulking agent described in Japanese Patent No. 3576962, Patent No. No. 3482337, a paper bulking agent described in Japanese Patent No. 2971447, a paper making paper quality improving agent described in Japanese Patent No. 3283248, a drying efficiency improving agent described in Japanese Patent No. 3338333, and a Japanese Patent No. 3387036. Smoothness and air permeability improver described in Japanese Patent No. 3517200, additive for papermaking described in Japanese Patent No. 3517200, paper quality improver described in Japanese Patent Laid-Open No. 2001-248100, and paper quality improvement described in Japanese Patent Laid-Open No. 2003-336196 Agent, paper quality improver described in JP 2004-52216 A, paper quality improver described in JP 2004-107865 A, paper quality improver described in JP 2004-91950 A, JP 2005-60921 A The powdery papermaking composition described in the above, the papermaking drug particles described in JP2005-68633, and the paper non-use paper described in JP2000-273792A. A clarifying agent, an additive for recycling used paper described in JP-A-2002-129497, an additive for recycling used paper described in JP-A-2002-275786, an additive for recycling used paper described in JP-A-2002-294586, A bulking agent described in JP-A-2002-294594, a bulking agent for paper described in JP-A-2003-96692, a bulking agent described in JP-A-2003-96693, and an additive for recycling used paper described in JP-A-2003-96694 Used paper recycling additive described in JP-A-2003-96695, paper thickness improving agent described in JP-A-2003-171897, bulking agent for paper described in JP-A-2003-247197, JP-A-2003-253588 Paper bulking agent described in JP-A-2003-253589, paper bulking agent described in JP-A-2003-253590, paper bulking agent disclosed in JP-A-2003-253590, paper density-increasing agent described in JP-A-2003-328297 Paper densifying agents described in JP-A-2003-313799, paper-making additives described in JP-A-2004-11058, paper-density reducing agents described in JP-A-2004-27401, JP-A 2004 -115935 for paper Agent, paper bulking agent described in JP-A-2004-76244, paper modifier described in JP-A-2004-176213, paper additive described in JP-A-2004-308095, JP-A-2005- No. 42278, a bulking agent described in JP-A-2005-42279, a bulking agent for papermaking described in JP-A-2005-60891, a paper softening agent described in Japanese Patent No. 3521422, JP-A-2002 -275792, bulky sizing agent described in JP 2002-275792, paper bulk sizing agent described in JP 2003-286692, paper manufacture described in JP 2004-270074 Bulking agent composition for paper, Bulking agent for papermaking described in JP-A-2004-285490, Bulking agent for paper described in JP-A-2004-339629, Bulking agent described in JP-A-2005-54330, JP-A-2005- A bulking agent described in Japanese Patent No. 68592.

  The bulking agent for paper referred to in the present invention is a general term for compounds having both a hydrophobic group and a hydrophilic group in a molecule, which can reduce the density of paper when paper is added internally to the stock. . In addition to the bulking agent as described in the above-mentioned patent document, the papermaking paper quality improver, drying efficiency improver, smoothness and air permeability improver, papermaking additive, paper quality improver, paper opacifier, waste paper recycling Additives, paper thickness improvers, paper densifying agents, paper modifiers, paper softening agents, bulky softening agents, papermaking bulky sizing agents, and the like.

  The bulking agent is usually added in the range of 0.2 to 20% by solid weight with respect to the raw material pulp. If the solid content is less than 0.2% by weight, the effect of reducing the density is small, and even if added in excess of 20% by solid weight, the bulky effect reaches its peak, so there is no meaning and the cost cannot be put into practical use.

  The bulking agent is preferably added after the raw material mixer and before the addition of a filler slurry consisting of the inorganic particles of the present invention, a cationic compound, and starch paste, and other fillers.

When making an electrophotographic transfer paper with improved paper strength and stiffness according to the present invention, surface coating may be applied for the purpose of improving surface strength, imparting water resistance, and improving ink deposition. There are no particular restrictions on the type of surface treatment agent. For example, raw starch, modified starch such as oxidized starch, esterified starch, cationized starch, enzyme-modified starch, aldehyde-modified starch, and hydroxyethylated starch, carboxy Cellulose derivatives such as methylcellulose, hydroxyethylcellulose, methylcellulose, modified alcohols such as polyvinyl alcohol and carboxyl-modified polyvinyl alcohol, styrene butadiene copolymers, polyvinyl acetate, vinyl chloride-vinyl acetate copolymers, polyvinyl chloride, polyvinylidene chloride, Polyacrylic acid ester, polyacrylamide and the like can be used alone or in combination. Among them, coating of hydroxyethylated starch excellent in the effect of improving surface strength is preferable, and among hydroxyethylated starch, after hydroxyethylation reaction of starch, in a solid state with a moisture content of 5 to 17%, hydrogen chloride gas, A dry low molecular weight hydroxyethylated starch that has been reduced in molecular weight by acid treatment with hydrochloric acid, sulfuric acid or the like, or oxidation treatment with ammonium persulfate, hydrogen peroxide, chlorine gas or the like is more preferable. In addition to the above-mentioned agents, surface sizing agents such as styrene acrylic acid, styrene maleic acid, olefinic compounds, and cationic sizing agents can be applied to the surface treatment agent. When applying a surface treating agent, the coating amount per both surfaces is 0.05-2.0 g / m < ² > by solid content weight.

  In addition, in the production of the electrophotographic transfer paper of the present invention, an inorganic conductive agent such as sodium chloride, sodium sulfate or potassium chloride or an organic conductive agent such as dimethylaminoethyl methacrylate is externally added to control electrical resistance. In this case, the coating agent and the coating amount are appropriately prepared.

  The type of the paper machine for making the base paper is not particularly limited, and can be appropriately made with a long net paper machine, a twin wire machine, a Yankee paper machine, or the like. The press line pressure is used within the normal operating range. The calendar may be bypassed or processed within the normal operating range.

  The apparatus for applying the surface coating agent to the electrophotographic transfer paper base paper is not particularly limited, and a film transfer type such as a shim sizer or a gate roll size press is preferable.

  The electrophotographic transfer paper of the present invention may have a basis weight in the range of about 40 to 80 g / m <2>, and may be a level having a smoothness, a friction coefficient, and the like that of a normal electrophotographic transfer paper. The electrophotographic transfer paper of the present invention can also be used as an information recording paper such as an ink jet common paper.

  Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. However, the present invention is not limited to these examples. In the examples, “%” and “part” indicate solid weight% and solid weight part, respectively.

In the following examples and comparative examples, physical properties, paper Clark stiffness, and pure bending stiffness were measured by the following methods.
(1) Average particle size: After treating the average particle size of the surface-treated inorganic particles and untreated inorganic particles with an ultrasonic disperser for 5 minutes, a laser scattering particle size measuring device Mastersizer 2000 (manufactured by MARVERN) was used. Measured.
(2) Zeta potential: The zeta potential of surface-treated inorganic particles and untreated inorganic particles was measured using ZETASIZER3000HAS (manufactured by MALVERN).
(3) Breaking length: Conforms to JIS P 8113
(4) Pure bending stiffness: The initial pure bending stiffness of the paper was measured using a pure bending stiffness measuring device (manufactured by Suga Test Instruments Co., Ltd.). The pure bending stiffness is not a stiffness measurement method stipulated by JIS, but shows a measured value close to the feel when the paper is actually bent by hand.
(5) ISO whiteness: measured in accordance with JIS P8148.
(6) ISO opacity: measured in accordance with JIS P8149.
(7) Filler yield: The amount of filler in the paper was calculated from the basis weight and ash content of the paper, and was calculated from the ratio to the charged amount of filler.
(8) Starch yield: The amount of starch in paper was measured using Biosensor BF-2 (manufactured by KS Systems) and calculated from the ratio to the amount of starch charged.
(9) Evaluation method of the number of jams, the amount of paper dust, and back-through: When using a Fuji Xerox copier (Vivache 555), printing black and white at a speed of 55 sheets / min on A4 paper, and printing 1,000 sheets The number of jams was counted and the amount of paper dust was measured. The strike-through was evaluated in three stages: ◎ (excellent), ○ (good), and x (defect) by visually observing the black solid surface when printing 1,000 copies.
[Example 1]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, polyvinylamine (trade name: Katio) having a concentration of 2% as a cationic compound. Fast VFH (manufactured by BASF) Add 10 parts of aqueous solution, and further add 10 parts of raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) with a concentration of 2% as starch paste liquid, and stir at room temperature for 10 minutes to make a filler slurry And a mixed composition which was a composite obtained by surface-treating the filler was obtained. A sulfuric acid band was added to the LBKP pulp slurry at 0.8% per pulp weight, and the mixed composition as a filler was added at 30% by weight per paper weight. The slurry was made with a long net test machine to obtain a base paper having a basis weight of 64 g / m ² . Coating this base paper with a test gate roll coater at a coating speed of 1,200 m / min and 0.2 parts of sodium chloride mixed with 100 parts of dry low molecular weight hydroxyethylated starch (trade name: ETHYLEX2025, manufactured by Staley) The electrophotographic transfer paper was obtained by coating and drying the working solution at 1.0 g / m ² on both sides. The results are shown in Table 1.
[Example 2]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, polyvinylamine (trade name: Katio) having a concentration of 2% as a cationic compound. Fast VFH, manufactured by BASF) Add 10 parts of aqueous solution, and then add 100 parts of 2% unprocessed potato starch (manufactured by Nihon Food Processing Co., Ltd.) as starch paste, and mix at room temperature for 10 minutes. I got a thing. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 3]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, polyvinylamine (trade name: Katio) having a concentration of 2% as a cationic compound. Fast VFH, manufactured by BASF) Add 10 parts of aqueous solution, and then add 100 parts of 2% urea-phosphorylated starch (trade name: Splet # 250, manufactured by Nippon Food Processing Co., Ltd.) as starch paste. The mixture composition was obtained by stirring for 10 minutes. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 4]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, polyvinylamine (trade name: Katio) having a concentration of 2% as a cationic compound. Fast VFH (manufactured by BASF)) Add 10 parts of aqueous solution, and then add 100 parts of amphoteric starch (trade name: CATO3210, NSC Japan) paste solution with a concentration of 2% as starch paste solution and stir at room temperature for 10 minutes. Thus, a mixed composition was obtained. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 5]
While stirring 100g slurry of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles with a solid content concentration of 20% at room temperature, polyamine epichlorohydrin with 2% concentration as a cationic compound (trade name) : AC7300, manufactured by Seiko PMC) Add 10 parts of aqueous solution, and then add 100 parts of 2% unprocessed corn starch (manufactured by Nippon Food Processing Co., Ltd.) as starch paste, and mix by stirring for 10 minutes at room temperature. A composition was obtained. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 6]
While stirring 100 parts slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, 2% polyamine epichlorohydrin (product) Name: AC7300, manufactured by Seiko PMC) Add 10 parts of aqueous solution, and then add 100 parts of amphoteric starch (product name: CATO315, manufactured by NSC Japan) as starch paste solution for 10 minutes at room temperature. The mixture composition was obtained by stirring. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 7]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, cationized starch (trade name: 2%) as a cationic compound. CATO304 (manufactured by NSC, Japan) Add 10 parts of paste, and then add 100 parts of 2% unprocessed corn starch (manufactured by Nippon Food Processing Co., Ltd.) as starch paste, and stir at room temperature for 10 minutes to mix A composition was obtained. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 8]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, cationized starch (trade name: 2%) as a cationic compound. Add 10 parts of paste solution (CATO302, NSC Japan), and add 100 parts of 2% oxidized starch (trade name: SK-20, Nippon Corn Starch) paste solution as starch paste solution for 10 minutes at room temperature. The mixture composition was obtained by stirring. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 9]
Cationized starch with 2% concentration as a cationic compound (trade name: CATO304, manufactured by NSC Japan) 10 parts of starch paste, oxidized starch with 2% concentration as starch paste (trade name: MS-3800, Nippon Food Processing Co., Ltd.) (Product made) 100 parts of paste solution was added and stirred at room temperature for 10 minutes. This mixture was added as inorganic particles to 100 parts of a slurry of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) having a solid content concentration of 20% and stirred at room temperature for 10 minutes to obtain a mixed composition. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 10]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, cationized starch (trade name: 2%) as a cationic compound. CATO304 (manufactured by NSC, Japan) 10 parts of paste liquid is added, and then 100 parts of hydroxyethylated starch (trade name: ETHYLEX2025, manufactured by Staley) paste concentration 2% as starch paste liquid is added and stirred at room temperature for 10 minutes Thus, a mixed composition was obtained. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 11]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, cationized starch (trade name: 2%) as a cationic compound. CATO304 (manufactured by NSC, Japan) 10 parts of paste solution is added, and then 100 parts of acetylated starch (trade name: Z-300, manufactured by Nissho Chemical Co., Ltd.) with a concentration of 2% as starch paste solution is added at room temperature. The mixture composition was obtained by stirring for 10 minutes. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 12]
While stirring 100 parts slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, polyamide epichlorohydrin with 2% concentration as a cationic compound (product) Name: WS4020, manufactured by Seiko PMC) Add 10 parts of aqueous solution, and then add 100 parts of 2% unprocessed corn starch (manufactured by Nippon Food Processing Co., Ltd.) as starch paste, and stir at room temperature for 10 minutes. A mixed composition was obtained. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 13]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, diallyldimethylammonium chloride (Table 1) having a concentration of 2% as a cationic compound. Among them, 10 parts of an aqueous solution of homopolymer (trade name: AC7304, manufactured by Seiko PMC) is added, and 2% unprocessed corn starch (manufactured by Nippon Food Processing Co., Ltd.) paste 100 Part was added and stirred for 10 minutes at room temperature to obtain a mixed composition. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 14]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, diallyldimethylammonium chloride (Table 1) having a concentration of 2% as a cationic compound. Among them, 10 parts of an aqueous solution of a copolymer of acrylamide and acrylamide (trade name: N7527, manufactured by OndeoNalco) is added, and then 2% unprocessed corn starch (manufactured by Nippon Food Processing Co., Ltd.) 100 parts were added and stirred at room temperature for 10 minutes to obtain a mixed composition. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 15]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, polyethyleneimine (trade name: Katio) with a concentration of 2% as a cationic compound. (Fast SF, manufactured by Seiko PMC) Add 10 parts of aqueous solution, and then add 100 parts of 2% non-processed raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) as starch paste, and mix by stirring for 10 minutes at room temperature. A composition was obtained. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 16]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, polyaluminum chloride (trade name: 2%) as a cationic compound. (PAC, manufactured by Nippon Light Metal Co., Ltd.) Add 10 parts of aqueous solution, and then add 100 parts of raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) with a concentration of 2% as starch paste liquid, and stir at room temperature for 10 minutes to mix. I got a thing. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 17]
While stirring 100 parts of a 20% solids slurry of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles, add 10 parts of 2% sulfuric acid band aqueous solution as a cationic compound. Further, 100 parts of raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) having a concentration of 2% as starch paste was added and stirred at room temperature for 10 minutes to obtain a mixed composition. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 18]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, polyvinylamine (trade name: Katio) having a concentration of 2% as a cationic compound. Fast VFH, manufactured by BASF) Add 10 parts of aqueous solution, and further add 100 parts of 2% unprocessed corn starch (manufactured by Nihon Food Processing Co., Ltd.) as starch paste, and mix at room temperature for 10 minutes. I got a thing. A pulp slurry containing 10% NBKP, 20% TMP, and 70% NDIP as raw material pulp, 0.8% sulfuric acid band per pulp weight, 1.0% paper bulking agent (trade name: KB-110, manufactured by Kao Corporation) per pulp weight, The mixed composition was added as a filler so as to be 15% by weight based on the paper weight. The slurry was made with a long net test machine to obtain a base paper having a basis weight of 64 g / m ² . Coating this base paper with a test gate roll coater at a coating speed of 1,200 m / min and 0.2 parts of sodium chloride mixed with 100 parts of dry low molecular weight hydroxyethylated starch (trade name: ETHYLEX2025, manufactured by Staley) The electrophotographic transfer paper was obtained by coating and drying the working solution at 1.0 g / m ² on both sides.
The results are shown in Table 1.
[Example 19]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, cationized starch (trade name: 2%) as a cationic compound. CATO302 (manufactured by NSC, Japan) Add 10 parts of paste, and then add 100 parts of 2% unprocessed corn starch (manufactured by Nippon Food Processing Co., Ltd.) as starch paste, and mix by stirring for 10 minutes at room temperature. A composition was obtained. A pulp slurry containing 10% NBKP, 20% TMP, and 70% NDIP as raw material pulp, 0.8% sulfuric acid band per pulp weight, 1.0% paper bulking agent (trade name: KB-110, manufactured by Kao Corporation) per pulp weight, The mixed composition was added as a filler so as to be 15% by weight based on the paper weight. The slurry was made with a long net test machine to obtain a base paper having a basis weight of 64 g / m ² . Coating this base paper with a test gate roll coater at a coating speed of 1,200 m / min and 0.2 parts of sodium chloride mixed with 100 parts of dry low molecular weight hydroxyethylated starch (trade name: ETHYLEX2025, manufactured by Staley) The electrophotographic transfer paper was obtained by coating and drying the working solution at 1.0 g / m ² on both sides.
The results are shown in Table 1.
[Example 20]
While stirring 100 parts of a 20% solid slurry of heavy calcium carbonate (trade name: Super # 2000, manufactured by Maruo Calcium Co., Ltd.) as inorganic particles at room temperature, polyvinylamine (product of 2% concentration as a cationic compound) Name: Catifast VFH, manufactured by BASF) Add 10 parts of aqueous solution, and then add 100 parts of 2% unprocessed corn starch (manufactured by Nippon Food Processing Co., Ltd.) as starch paste, and stir at room temperature for 10 minutes. Thus, a mixed composition was obtained. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 21]
While stirring 100 parts of a 20% solids slurry of talc (trade name: NTL, manufactured by Nippon Talc Co., Ltd.) as inorganic particles at room temperature, 2% polyvinylamine (trade name: Cachio Fast VFH as a cationic compound) (Manufactured by BASF) Add 10 parts of aqueous solution, add 100 parts of 2% untreated corn starch (manufactured by Nippon Food Processing Co., Ltd.) as starch paste, and stir at room temperature for 10 minutes to mix the composition. Obtained. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 22]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, polyvinylamine (trade name: Katio) having a concentration of 2% as a cationic compound. Fast VFH (manufactured by BASF)) Add 25 parts of aqueous solution, then add 250 parts of raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) with a concentration of 2% as starch paste, and mix for 10 minutes at room temperature. I got a thing. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 23]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, polyvinylamine (trade name: Katio) having a concentration of 2% as a cationic compound. (Fast VFH, manufactured by BASF) 50 parts of aqueous solution was added, and further 500 parts of raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) with a concentration of 2% as starch paste solution was added and stirred at room temperature for 10 minutes to mix composition I got a thing. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Example 24]
While stirring 100 parts of a slurry of 20% solid concentration of light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as inorganic particles at room temperature, polyvinylamine (trade name: Katio) having a concentration of 2% as a cationic compound. Fast VFH (manufactured by BASF)) Add 100 parts of aqueous solution, and further add 1000 parts of raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) with a concentration of 2% as starch paste liquid, and stir at room temperature for 10 minutes to mix composition I got a thing. The same procedure as in Example 1 was performed except that this mixed composition was used in place of the mixed composition of Example 1. The results are shown in Table 1.
[Comparative Example 1]
To the LBKP pulp slurry, a sulfate band was added at 0.8% per pulp weight, and light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as a filler was added at 30% by weight per paper weight. Furthermore, polyvinylamine (trade name: Cassiofast VFH, manufactured by BASF) is added to 1% by weight per filler weight, and raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) paste liquid becomes 10% by weight per filler weight. Were added. The slurry was made with a long net test machine to obtain a base paper having a basis weight of 64 g / m ² . Coating this base paper with a test gate roll coater at a coating speed of 1,200 m / min and 0.2 parts of sodium chloride mixed with 100 parts of dry low molecular weight hydroxyethylated starch (trade name: ETHYLEX2025, manufactured by Staley) The electrophotographic transfer paper was obtained by coating and drying the working solution at 1.0 g / m ² on both sides. The results are shown in Table 1.
[Comparative Example 2]
To the LBKP pulp slurry, a sulfate band was added at 0.8% per pulp weight, and light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as a filler was added at 30% by weight per paper weight. Furthermore, add 10g aqueous solution of polyamine epichlorohydrin (trade name: AC7300, manufactured by Seiko PMC) at a concentration of 2% to 1% by weight of filler, and paste raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) It added so that it might become 10 weight% per filler weight. The slurry was made with a long net test machine to obtain a base paper having a basis weight of 64 g / m ² . Coating this base paper with a test gate roll coater at a coating speed of 1,200 m / min and 0.2 parts of sodium chloride mixed with 100 parts of dry low molecular weight hydroxyethylated starch (trade name: ETHYLEX2025, manufactured by Staley) The electrophotographic transfer paper was obtained by coating and drying the working solution at 1.0 g / m ² on both sides. The results are shown in Table 1.
[Comparative Example 3]
To the LBKP pulp slurry, a sulfate band was added at 0.8% per pulp weight, and light calcium carbonate (trade name: PCX, manufactured by Shiraishi Calcium Co., Ltd.) as a filler was added at 30% by weight per paper weight. Add 10 parts of paste solution of 2% cationized starch (trade name: CATO304, manufactured by NSC Japan) to 1% by weight of filler, and add raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) paste solution. It added so that it might become 10 weight% per filler weight. The slurry was made with a long net test machine to obtain a base paper having a basis weight of 64 g / m ² . Coating this base paper with a test gate roll coater at a coating speed of 1,200 m / min and 0.2 parts of sodium chloride mixed with 100 parts of dry low molecular weight hydroxyethylated starch (trade name: ETHYLEX2025, manufactured by Staley) The electrophotographic transfer paper was obtained by coating and drying the working solution at 1.0 g / m ² on both sides. The results are shown in Table 1.
[Comparative Example 4]
LBKP pulp slurry, sulfuric acid band 0.8% per pulp weight, paper bulking agent (trade name: KB-110, manufactured by Kao Corporation) 1.0% per pulp weight, light calcium carbonate as filler (trade name: PCX, Shiroishi) Calcium Co., Ltd.) was added at 30% by weight per paper weight. Furthermore, polyvinylamine (trade name: Cassiofast VFH, manufactured by BASF) is added to 1% by weight per filler weight, and raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) paste liquid becomes 10% by weight per filler weight. Were added. The slurry was made with a long net test machine to obtain a base paper having a basis weight of 64 g / m ² . Coating this base paper with a test gate roll coater at a coating speed of 1,200 m / min and 0.2 parts of sodium chloride mixed with 100 parts of dry low molecular weight hydroxyethylated starch (trade name: ETHYLEX2025, manufactured by Staley) The electrophotographic transfer paper was obtained by coating and drying the working solution at 1.0 g / m ² on both sides. The results are shown in Table 1.
[Comparative Example 5]
LBKP pulp slurry, sulfuric acid band 0.8% per pulp weight, paper bulking agent (trade name: KB-110, manufactured by Kao Corporation) 1.0% per pulp weight, light calcium carbonate as filler (trade name: PCX, Shiroishi) Calcium Co., Ltd.) was added at 30% by weight per paper weight. Furthermore, cationized starch (trade name: CATO302, manufactured by NSC Japan) paste liquid is added to 1% by weight of filler, and raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) paste liquid is 10% by weight of filler. It added so that it might become. The slurry was made with a long net test machine to obtain a base paper having a basis weight of 64 g / m ² . Coating this base paper with a test gate roll coater at a coating speed of 1,200 m / min and 0.2 parts of sodium chloride mixed with 100 parts of dry low molecular weight hydroxyethylated starch (trade name: ETHYLEX2025, manufactured by Staley) The electrophotographic transfer paper was obtained by coating and drying the working solution at 1.0 g / m ² on both sides. The results are shown in Table 1.
[Comparative Example 6]
To the LBKP pulp slurry, a sulfate band was added at 0.8% per pulp weight, and heavy calcium carbonate (trade name: Super # 2000, manufactured by Maruo Calcium Co., Ltd.) as a filler was added at 30% by weight per paper weight. Furthermore, polyvinylamine (trade name: Cassiofast VFH, manufactured by BASF) is added to 1% by weight per filler weight, and raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) paste liquid becomes 10% by weight per filler weight. Were added. The slurry was made with a long net test machine to obtain a base paper having a basis weight of 64 g / m ² . Coating this base paper with a test gate roll coater at a coating speed of 1,200 m / min and 0.2 parts of sodium chloride mixed with 100 parts of dry low molecular weight hydroxyethylated starch (trade name: ETHYLEX2025, manufactured by Staley) The electrophotographic transfer paper was obtained by coating and drying the working solution at 1.0 g / m ² on both sides. The results are shown in Table 1.
[Comparative Example 7]
To the LBKP pulp slurry, a sulfuric acid band was added at 0.8% per pulp weight, and talc (trade name: NTL, manufactured by Nippon Talc Co., Ltd.) as a filler was added at 30% by weight per paper weight. Furthermore, polyvinylamine (trade name: Cassiofast VFH, manufactured by BASF) is added to 1% by weight per filler weight, and raw corn starch (manufactured by Nippon Food Processing Co., Ltd.) paste liquid becomes 10% by weight per filler weight. Were added. This pulp slurry was weighed so that the basis weight of the sheet after paper making was 64 g / m ² and paper was made with a 150 mesh wire (area 200 cm ² ) using a round TAPPI paper machine. The slurry was made with a long net test machine to obtain a base paper having a basis weight of 64 g / m ² . Coating this base paper with a test gate roll coater at a coating speed of 1,200 m / min and 0.2 parts of sodium chloride mixed with 100 parts of dry low molecular weight hydroxyethylated starch (trade name: ETHYLEX2025, manufactured by Staley) The electrophotographic transfer paper was obtained by coating and drying the working solution at 1.0 g / m ² on both sides. The results are shown in Table 1.

Examples 1-8, 10-17 using a mixed slurry prepared by adding a cationic compound and starch paste to light calcium carbonate and mixing them, and previously mixing the cationic compound and starch paste, Example 9 using a mixed slurry prepared by mixing in addition to calcium was more powerful than Comparative Examples 1 to 3 in which light calcium carbonate, a cationic compound, and starch paste were separately added to the pulp. Length), rigidity, filler yield, and starch yield were greatly improved, no jamming occurred in the copying machine, and the amount of paper powder was greatly reduced, resulting in a good electrophotographic transfer paper. Moreover, since the average particle diameter of the prepared mixed slurry did not become excessively large, almost no decrease in whiteness or opacity was observed. On the other hand, the same applies to a system in which a bulking agent for paper is blended, and Examples 18 to 19 using a mixed slurry prepared by adding a cationic compound and starch paste to light calcium carbonate and mixing them are light calcium carbonate. Compared with Comparative Examples 4 to 5 to which a cationic compound and starch paste were added, paper strength (breaking length), rigidity, filler yield, and starch yield were significantly improved. In addition, the amount of paper dust decreased significantly. Example 22 in which the amount of raw material corn starch, which is a cationic compound added to light calcium carbonate, which is an inorganic filler, is 2.5 times the amount of Example 1, and which is 5 times the amount of Example 1, It can be seen that the paper strength and filler yield were further improved in Example 24 in which the amount was 23 or 10 times that in Example 1. Furthermore, in the mixed slurry prepared by adding and mixing the cationic compound and starch paste to the inorganic filler, Example 20 using heavy calcium carbonate as the inorganic filler and Example 21 using talc are respectively applied to the pulp. Compared to Comparative Examples 6 and 7 where inorganic filler, cationic compound and starch paste were added separately, paper strength and rigidity, filler yield and starch yield were greatly improved, no jamming occurred in the copying machine, and the amount of paper powder As a result, the electrophotographic transfer paper could be obtained.

Claims (6)

  The surface of a base paper having an average particle size of 0.1 to 30 μm and containing a filler that has been surface-treated with a cationic compound and starch other than the cationic compound, and the filler content in the paper is 5 to 40% solids by weight. An electrophotographic transfer paper provided with a treatment agent.   The cationic compound is cationized starch, polyamine epichlorohydrin, polyamide epichlorohydrin, polyvinylamine, a homopolymer of diallyldimethylammonium chloride, a copolymer of diallyldimethylammonium chloride and acrylamide, polyethyleneimine, polyaluminum chloride, 2. The electrophotographic transfer paper according to claim 1, wherein the transfer sheet is at least one selected from the group consisting of a sulfate band and a crosslinked cationized starch.   The starch for surface treatment of the inorganic particles is at least one kind of starch selected from the group consisting of oxidized starch, urea phosphorylated starch, hydroxyethylated starch, amphoteric starch, acetylated starch, and raw starch. The transfer paper for electrophotography according to claim 1 or 2.   The inorganic particles are clay, calcined kaolin, deramikaolin, titanium dioxide, zinc oxide, silicon oxide, amorphous silica, heavy calcium carbonate, light calcium carbonate, magnesium carbonate, barium carbonate, aluminum hydroxide, calcium hydroxide, 4. The electrophotographic transfer paper according to claim 1, wherein the transfer sheet is at least one selected from the group consisting of magnesium hydroxide and zinc hydroxide.   The mixing ratio of the inorganic particles, the cationic compound, and the starch is inorganic particles / cationic compound / starch = 100 / 0.1 / 0.1 to 100/100/100 in terms of solid content weight ratio. The electrophotographic transfer paper according to any one of the above. In a method for producing an electrophotographic transfer paper for making a paper mainly composed of pulp and filler, a filler slurry prepared by mixing inorganic particles having an average particle size of 0.1 to 30 μm, a cationic compound, and starch paste is used as a paper. A method for producing a transfer paper for electrophotography, comprising adding to the paper, making the paper so that the filler content in the paper is 5 to 40% by weight, and coating the surface treatment agent.