JP2017119410A - Crimp paper for ink jet recording and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crimp paper for ink jet recording excellent in color optical density of printing even when printed by an ink jet type printer using an aqueous pigment ink and having no transference of printed content to a facing surface as ink fixability is excellent.SOLUTION: A crimp paper has a pressure sensitive adhesive coating layer containing a non-detachable pressure sensitive adhesive substrate, a fine particle filler and a binder on at least one surface of a base paper, wherein the non-detachable pressure sensitive adhesive substrate is blended in a range of 100 to 130 mass% as a solid component based on the fine particle filler and the fine particle filler contains talc, settlement method silica having oil absorption measured based on ISO 787-5 of 130 to 190 ml/100 g and gel method silica having oil absorption measured based on ISO 787-5 of 300 to 330 ml/100 g.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a pressure-sensitive adhesive sheet for ink-jet recording suitable for printing by an ink-jet printer, and more particularly to a pressure-sensitive adhesive sheet for ink-jet recording suitable for printing by an ink-jet printer using a pigment-type aqueous ink.

  A pressure-sensitive adhesive paper that prints confidential information, advertisement information, etc. on the surface coated with a pressure-sensitive adhesive, then folds the paper so that the pressure-sensitive adhesive coated surface becomes the inner surface, and presses and seals it by applying a predetermined pressure. Are used in various applications. For the purpose of reducing postage costs, such pressure-bonded papers are detachably pressure-bonded with the personal information printed side facing inward, and used as postcards (hereinafter abbreviated as pressure-bonded postcards) instead of sealed letters. It is also used in various fields as pressure-bonded printed materials such as pressure-bonded advertisements.

  An example of the manufacturing method of the pressure-bonded paper is as follows. First, a pressure-sensitive adhesive composition that can be bonded by applying a certain pressure and can be re-peeled is applied to the surface of the base paper. Print on a form printer with the ink. Next, personal information (confidential information), which is variable information, is printed with various printers, folded in two or three, etc., and then passed between the pressure rolls of the dry sealer and coated with the pressure sensitive adhesive composition By bonding them together, a form is provided to the user. Here, if the paper is cut into postcard size, it becomes a crimped postcard. After receiving the pressure-bonded paper or pressure-bonded postcard, the recipient peels off the coated surface of the pressure-sensitive adhesive that has been bonded and reads the confidential information printed inside.

  In the crimping paper manufacturing process, the crimping paper is stored in advance with the fixed information (common information) printed on the crimping paper in advance, and the confidential information can be printed using as much of the stored crimping paper as necessary. It is common practice to be offered to customers. For this reason, there is often a certain amount of days after the fixed information is printed and before the confidential information is printed and provided, and the ink used for printing the fixed information is required to have weather resistance. A curable ink is generally used.

  An ink jet printer performs recording by ejecting ink as innumerable droplets by various means and adhering it to a recording sheet. However, in recent years, technical progress has been remarkably increased. It became possible and colorization became easy. As a result, it has become possible to obtain images that are not inferior to those of multi-color offset printing and color electrophotographic systems. In addition, inkjet printers have a running cost in color printing that is electrophotographic. Compared to other printers, it is cheaper and has become widespread. For these reasons, in recent years, inkjet printers are often used for printing confidential information on pressure-sensitive paper.

  Inkjet recording paper has been used for posters and drafting applications. For this reason, inkjet recording paper and inkjet recording ink have more color, color reproducibility and image weather resistance than conventional ones. It has come to be required. In response to these demands, ink jet recording inks and base materials (ink jet recording paper) have been improved. Recently, in addition to the conventionally known water-based dye inks, water-based pigment inks in which colorant pigments are dispersed in water are also used. As a result, the above requirements are met.

  Among these aptitudes, the improvement of the weather resistance due to the use of water-based pigment ink has made it possible to print fixed information with an ink jet printer instead of form printing with UV curable ink. For this reason, since the form printing process can be reduced by simultaneously printing fixed information and confidential information with an ink jet printer, it is expected to lead to a large cost improvement.

  On the other hand, when water-based pigment ink is used for the pressure-sensitive recording paper for ink jet recording, there are still some problems, and it is necessary to give new aptitude to the pressure-sensitive paper in order to cope with these problems. Specifically, it is as follows.

(1) High color density Since the colorant pigment in the aqueous pigment ink is insoluble in water unlike the colorant dye, the ratio of the colorant pigment may be increased too much in order to stably disperse the colorant pigment in the ink. It is not possible to obtain a clear color. In addition, one method of increasing the color density is to increase the blending ratio of a filler such as silica having high ink absorbency. However, in order to maintain an appropriate adhesive force as a pressure-bonded postcard, In this case, the amount of the filler in the pressure-sensitive adhesive coating layer) cannot be increased as much as that of a general ink jet recording paper.

(2) Improvement of ink fixability (prevention of print transfer when opened)
The colorant pigment in the aqueous pigment ink is less absorbable into the coating layer of the pressure-sensitive adhesive composition than the colorant dye, and the colorant pigment tends to remain on the coating layer. For this reason, the color material pigment remaining on the coating layer is transferred to the opposite surface while being pressed and held with a dry sealer, and the characters and barcodes are interpreted by the transferred color material pigment when the pressure-bonded postcard is peeled off. There is a problem that becomes difficult.

(3) Improvement of surface strength (preventing dirt on the pressure roll of dry sealer)
If the blending ratio of a highly water-absorbing filler, such as silica, is increased in order to absorb water-based pigment ink having poor absorbability, the coating layer strength of the printed coating layer will be weakened when the ink adhesion amount is increased. In addition, when pressure-bonding paper is pressure-bonded with a dry sealer and sealed, the colorant pigment is peeled off from the pressure roll of the dry sealer to contaminate the roll, and if this state continues, it accumulates in the pressure roll. There arises a problem that the stains contaminate the crimped paper.

  In order to solve these problems, various proposals related to pressure-sensitive paper for ink jet recording have been made. For example, in Patent Document 1, colloidal fine particles 5 to 25 such as silica and calcium carbonate having an average particle diameter of 1 to 100 nm with respect to 100 parts by mass of a styrene-methyl methacrylate graft copolymer natural rubber adhesive base (solid content). An information-carrying sheet excellent in fixability and water resistance of inkjet ink has been proposed by using a pressure-sensitive adhesive composition containing a mass part (see Patent Document 1).

  Further, it contains amorphous silica having an apparent specific gravity measured in accordance with JIS K 6220 of 0.25 g / ml or more as the fine particle filler of the adhesive layer, and the amorphous silica content in the adhesive layer is By setting the content to 20 to 50% by mass, a pressure-sensitive adhesive sheet excellent in suitability for high-speed inkjet printers has been proposed (see Patent Document 2).

  Further, the pseudo-adhesive layer contains a non-peelable adhesive mainly composed of natural rubber, a completely saponified polyvinyl alcohol, and a fine particle filler. These fine particle fillers are precipitated synthetic silica and gel synthetic silica. The blending mass ratio of 9: 1 to 7: 3 satisfies the adhesive / peeling characteristics, and is suitable for offset printing, recording density in ink jet recording, printing bleeding (feathering), ink drying / There has been proposed a pseudo-adhesive paper having improved absorbability, water resistance of ink, and transferability of a printed part during pressure bonding (see Patent Document 3).

  In addition, even if the pseudo-adhesive layer is a pseudo-adhesive sheet for pigment ink printing containing a fine particle filler together with an adhesive, and the precipitation method silica is used as the fine particle filler, the pigment ink is used for printing. There has been proposed a pseudo-adhesive sheet for pigment ink printing that is free from the risk of rubbing dirt and the like, and that does not cause the surface strength of the pseudo-adhesive layer provided on the surface of the substrate sheet to be weakened (see Patent Document 4). ).

JP 2001-262105 A (Claim 1) JP 2004-82466 A (Claim 1) JP 2009-249745 A (Claim 1) JP 2013-212671 A (Claim 1)

  However, the methods described in Patent Documents 1 and 2 do not provide sufficient surface strength and ink fixing effect when applied to a high-speed inkjet printer using aqueous pigment ink. For this reason, it has not reached the point of imparting ink smear prevention, non-transferability and the like in the dry sealer.

  In addition, the methods described in Patent Documents 3 and 4 did not provide sufficient high color density of an image when applied to a high-speed inkjet printer using aqueous pigment ink. .

  The present invention has been made in order to solve the above-described problems. Even when printing is performed with an ink jet printer using an aqueous pigment ink, the color density of printing is excellent, and the ink fixing property is excellent. An object of the present invention is to provide a pressure-sensitive recording paper for ink-jet recording in which printed contents are not transferred to the opposite surface.

  Another object of the present invention is that the pressure-sensitive adhesive coating layer is excellent in surface strength and does not stain the pressure roll of the dry sealer when sealing the postcard with the dry sealer. , To provide a pressure-sensitive adhesive sheet for inkjet recording

  Furthermore, other objects and effects of the present invention will be easily understood by those skilled in the art by referring to the following description.

  In order to solve the above-described problems, the pressure-sensitive adhesive sheet for ink jet recording according to the present invention includes a non-peelable pressure-sensitive adhesive base, a fine particle filler, and a binder on at least one surface of the base paper. A pressure-sensitive adhesive sheet for ink jet recording having an agent coating layer, wherein the non-peelable pressure-sensitive adhesive base is blended in a range of 100 to 130% by mass in solid content with respect to the fine particle filler, and the fine particle filler Talc, precipitated silica whose oil absorption measured according to ISO 787-5 is 130 to 190 ml / 100 g, and gel method whose oil absorption measured according to ISO 787-5 is 300 to 330 ml / 100 g Silica is contained, and partially saponified polyvinyl alcohol having a saponification degree of 85 to 90 mol% is contained as the binder.

  According to such a configuration, the color density of the pressure-sensitive adhesive coating layer surface (hereinafter abbreviated as “color developability”) is high, and it is applied to the opposite surface of the print recorded on the confidential surface at the time of peeling after pressure bonding with a dry sealer. Transfer (hereinafter abbreviated as “print transfer to the opposite surface”) is suppressed, and when pressure-bonding with a dry sealer, the printed pressure-sensitive adhesive coating layer adheres to the pressure roll of the dry sealer (hereinafter referred to as “ (Abbreviated as “dirt of pressure roll”). In particular, by adding partially saponified polyvinyl alcohol having a saponification degree of 85 to 90 mol%, printing transfer to the opposite surface is remarkably suppressed.

  In the pressure-sensitive adhesive paper for ink-jet recording of the present invention, it is sufficient that the pressure-sensitive adhesive coating layer provided on at least one surface satisfies the above conditions, and the other surface is pressure-sensitive adhesive having the same configuration. What is necessary is just to employ | adopt suitably structures, such as not providing an agent coating layer, a pressure sensitive adhesive coating layer of a different structure, and a pressure sensitive adhesive coating layer.

  In a preferred embodiment of the present invention, the average particle diameter of the fine particle filler by a laser diffraction method is 5.0 to 7.0 μm for the talc, and 2.0 to 4 for the precipitated silica. The gel method silica may be 6.0 to 8.0 μm.

  According to such a configuration, since the average particle diameter of the fine particle filler falls within a preferable range, it is possible to further suppress the dirt on the pressure roll of the dry sealer and the transfer of printing to the opposite surface, and recording by an inkjet printer. The color developability of the image can be further improved.

  In a preferred embodiment of the present invention, the fine particle filler is a solid content, the talc is 10 to 40% by mass, the precipitated silica is 50 to 70% by mass, and the gel silica is 10 to 20%. It may contain mass%.

  According to such a configuration, since the blending ratio of the fine particle filler becomes preferable, it is possible to further suppress printing transfer to the facing surface.

  In a preferred embodiment of the present invention, magnesium sulfate may be further blended in the pressure-sensitive adhesive coating layer in the range of 5 to 15% by mass in solid content with respect to the fine particle filler.

  According to such a configuration, it is possible to obtain a preferable pressure-sensitive adhesive paper for ink jet recording with improved ink color development and further improved bleeding prevention effect.

  In a preferred embodiment of the present invention, the pressure-sensitive adhesive coating layer further has an average particle diameter of 10 to 10 by laser diffraction method in the range of 10 to 25% by mass in solid content with respect to the fine particle filler. You may mix | blend 20 micrometers wheat flour starch.

  According to such a configuration, it contributes to the adjustment of the adhesive force of the pressure-sensitive adhesive, and it is easier to appropriately adjust the adhesive strength, thereby further improving the printing transfer to the opposite surface. Further, the absorbability of the aqueous pigment ink is also improved.

  In a preferred embodiment of the present invention, the partially saponified polyvinyl alcohol having a saponification degree of 85 to 90 mol% is 15 to 30 with respect to the fine particle filler in the pressure-sensitive adhesive coating layer. It may be contained by mass%.

  According to such a configuration, in addition to improving the transfer of printing to the opposite surface, the amount of the partially saponified polyvinyl alcohol is in an appropriate range, so that the pressure-sensitive adhesive coating layer is sufficient The ink absorbability with respect to the aqueous pigment ink is not hindered while having a high strength.

  The present invention can also be understood as a method for manufacturing a pressure-sensitive adhesive paper for ink jet recording.

  The method for producing a pressure-sensitive adhesive paper for ink jet recording according to the present invention comprises a base paper preparing step for preparing a base paper, a fine particle filler, and a pressure sensitive adhesive having a solid content of 100 to 130% by mass with respect to the fine particle filler. A pressure-sensitive adhesive composition adjusting step for adjusting a pressure-sensitive adhesive composition using a pressure-sensitive adhesive composition raw material containing a base, and the pressure-sensitive adhesive composition on at least one surface of the base paper A pressure-sensitive adhesive coating step in which an object is traveled to provide a pressure-sensitive adhesive coating layer. The fine particle filler has talc and an oil absorption measured according to ISO 787-5 of 130 to 190 ml. / 100 g of precipitated silica and gel silica having an oil absorption of 300 to 330 ml / 100 g measured based on ISO 787-5, and the binder has a saponification degree of 85 to 90 mol%. A saponified polyvinyl alcohol is included.

  According to such a configuration, it is possible to easily manufacture a pressure-sensitive adhesive sheet for ink-jet recording which has a high color density of printing, suppresses printing transfer to the opposite surface, and does not stain the pressure roll of the dry sealer.

  The pressure-sensitive adhesive paper for ink-jet recording according to the present invention has a high color density, and the pressure-sensitive adhesive coating layer has a sufficient surface strength, so that even when an aqueous pigment ink is used, the transfer of printing to the opposite surface is suppressed. The pressure roll is not soiled.

  In addition, by selecting an optimum filler as the fine particle filler to be added to the pressure-sensitive adhesive composition, or by adding another raw material to the pressure-sensitive adhesive composition, a high ink fixing property can be obtained. The surface strength of the pressure adhesive composition coating layer is also sufficiently high. Due to the increased surface strength, even when an aqueous pigment ink is used, the color developability is good, and the transfer of printing to the opposite surface and the contamination of the pressure roll are further suppressed.

It is a graph (the 1) which shows the mixing | blending of the pressure sensitive adhesive composition coating material in an Example. It is a chart (the 2) which shows the mixing | blending of the pressure sensitive adhesive composition coating material in an Example. It is a graph (the 3) which shows the mixing | blending of the pressure sensitive adhesive composition coating material in an Example. It is a graph (the 1) which shows the mixing | blending of the pressure sensitive adhesive composition coating material in a comparative example. It is a graph (the 2) which shows the mixing | blending of the pressure sensitive adhesive composition coating material in a comparative example. It is a graph (the 3) which shows the mixing | blending of the pressure sensitive adhesive composition coating material in a comparative example. It is a graph which shows the physical-property evaluation of the crimping | compression-bonding paper for inkjet recording obtained in the Example. It is a table | surface which shows the physical-property evaluation of the crimping | compression-bonding paper for inkjet recording obtained by the comparative example.

  Hereinafter, preferred embodiments of the present invention will be described in detail, but the present invention is not limited to the following descriptions.

  As described above, in the printing by the ink jet printer on the pressure-sensitive recording paper for ink jet recording, the ink jet ink ejected from the ink nozzle first adheres to the surface of the paper as a droplet, and then the dye / The pigment penetrates into the paper and fixes. Here, when water-based pigment ink is used, since the colorant pigment in the water-based pigment ink has poor absorbability to the pressure-sensitive adhesive coating layer, only water in the water-based pigment ink penetrates into the paper, and color The material pigment tends to remain on the surface of the pressure-sensitive adhesive coating layer. If the colorant pigment remaining on the surface of the pressure-sensitive adhesive coating layer is insufficiently absorbed or fixed, a problem of printing transfer to the opposite surface occurs. In addition, when the ink adhesion amount is increased in order to improve the color developability with the aqueous pigment ink, there is a possibility that the problem of contamination of the pressure roll may occur because the ink is not sufficiently absorbed by the coating layer.

  In order to solve these problems, the pressure-sensitive recording paper for ink jet recording according to the present invention employs the following configuration.

  The pressure-sensitive adhesive sheet for ink jet recording according to the present invention comprises a pressure-sensitive adhesive coating layer comprising a pressure-sensitive adhesive composition on at least one surface of a base paper. In the present invention, various information papers such as kraft paper, foam paper, high quality paper, medium quality paper, OCR paper and the like can be used as appropriate as the base paper used for the pressure-sensitive recording paper for ink jet recording. These papers may be commercially available, but when manufactured from pulp, if necessary, a wet paper strength enhancer or the like may be added to impart water resistance. Here, the fiber material of the base paper is not particularly limited, and general wood pulp can be appropriately selected and used. However, in consideration of environmental aspects, waste paper generated in the process, waste paper pulp and kenaf, Non-wood raw materials such as bagasse and bamboo may be used.

In the present invention, the rice basis weight of the pressure-sensitive recording paper for ink jet recording is not particularly limited, but it is preferably in the range of 60 to 200 g / m ² in consideration of processing into pressure-sensitive postcard paper. The selection of the tsubo is performed so as to satisfy the weight standard of the postcard in the postal method, and the weight is set in the range of 2 to 6 g when the postcard is formed into a crimped postcard.

  In the present invention, the “pressure-sensitive adhesive composition” refers to a composition that can be bonded by pressing without being bonded in a normal state and can be peeled off by manual peeling after pressing. The main material is a non-peelable adhesive base that bears the effect, a fine particle filler that contributes to ink absorption and the like, and a binder that contributes to the surface strength and the like of the pressure-sensitive adhesive coating layer. Furthermore, it is preferable to blend an ink fixing agent or the like that imparts ink fixing properties of an ink jet printer.

  In the present invention, examples of the non-peelable pressure sensitive adhesive that can be used in the pressure sensitive adhesive composition include natural rubber latex and synthetic rubber latex. As natural rubber latex, natural rubber latex obtained by graft polymerization of natural rubber with methyl methacrylate and styrene, natural rubber latex mixed with natural rubber and methyl methacrylate, natural rubber latex and protection A mixture with a colloidal acrylic copolymer emulsion or the like can be suitably used because it easily develops an appropriate adhesion ability. As the synthetic rubber latex, styrene-butadiene latex can be preferably used. These latexes can be used alone or in combination of two or more.

  Further, in the present invention, the blending amount of the non-peelable pressure-sensitive adhesive is preferably in the range of 100 to 130 parts by mass with respect to 100 parts by mass of the fine particle filler in terms of solid content. When the blending amount of the non-peeling pressure-sensitive adhesive is less than 100 parts by mass, the adhesive strength becomes weak because the blending amount of the non-peeling pressure-sensitive adhesive is small. Necessary. Since the pressure-bonding postcard paper is sealed with a strong pressure, a strong pressure is also applied between the opposed surfaces that have been pressure-bonded. On the other hand, when the blending amount of the non-peeling pressure-sensitive adhesive exceeds 130 parts by mass, the blending ratio of the fine particle filler is relatively lowered, so that the ink absorbability and the fixing property are lowered, and the pressure-sensitive adhesive coating is reduced. Since the work layer cannot fix the ink-jet ink sufficiently and quickly, the color developability may be deteriorated.

  In the present invention, talc and two types of amorphous silica are used in combination as the fine particle filler to be blended in the pressure-sensitive adhesive composition. According to the knowledge of the inventors, by using two types of amorphous silica and talc in combination, it is possible to suppress dirt on the pressure roll and to suppress printing transfer to the opposite surface.

  Since amorphous silica is porous and has a high absorption capacity for water-based pigment inks, the ink absorbability and ink of the pressure-sensitive adhesive coating layer when blended in a pressure-sensitive adhesive composition Fixability is improved, and the aqueous pigment ink can be quickly absorbed and fixed. Here, the degree of ink absorption of amorphous silica can be evaluated by the amount of oil absorption, and it is generally considered that as the amount of oil absorption increases, the absorptivity of the inkjet ink increases.

  One of the two types of amorphous silica used in the present invention has a sedimentation amount of 130 to 190 ml / 100 g of oil absorption (hereinafter sometimes simply referred to as “oil absorption”) measured based on ISO 787-5. It is a method silica, and the other is a gel method silica having an oil absorption of 300 to 330 ml / 100 g. By using such precipitated silica and gel silica together, it is possible to produce a pressure-sensitive postcard paper for inkjet which has excellent color developability of printing / printed images, good ink absorbability and ink fixability, and no print transition at the time of opening. Can be obtained.

  Here, when the oil absorption amount of the precipitated silica is less than 130 ml / 100 g, sufficient fixing ability of the water-based pigment ink cannot be imparted to the pressure-sensitive adhesive coating layer, and printing transfer to the opposite surface occurs. There is. On the contrary, when the oil absorption amount of the precipitated silica exceeds 190 ml / 100 g, the ink absorbability of the pressure-sensitive adhesive coating layer becomes too high, and a large amount of ink is absorbed into the coating layer. The ink remaining in the ink may be reduced, and the color developability may be deteriorated.

  On the other hand, when the oil absorption amount of the gel method silica is less than 300 ml / 100 g, the ink absorptivity becomes too weak and the color developability may deteriorate. Further, when the oil absorption amount of the gel method silica exceeds 330 ml / 100 g, not only the ink absorbability becomes too strong, but also the adhesive is absorbed by the excessive absorbency, and the pressure roll may be soiled. There is.

  The average particle diameter of these fine particle fillers by laser diffraction method is talc is 5.0 to 7.0 μm, the precipitated silica is 2.0 to 4.0 μm, and the gel silica is 6.0. It is preferable that it is thru | or 8.0 micrometers. By using such a fine particle filler having an average particle diameter, the adhesive strength and the coating layer strength are preferable, and the pressure roll stain of the dry sealer and the printing transfer to the opposite surface are further suppressed, and recording by an ink jet printer is performed. The color developability of the image can be further improved.

  Here, when the average particle diameter of talc is less than 5.0 μm, the strength of the coating layer is likely to be weak, and there is a possibility that the pressure roll of the dry sealer is soiled. On the other hand, when the average particle diameter of talc exceeds 7.0 μm, talc has a lower ink absorbability than precipitated silica or gel method silica, and therefore the proportion of talc with low ink absorbability on the coating layer surface increases. As a result, the ink absorptivity of the surface of the coating layer is deteriorated, and there is a possibility that the color developability is deteriorated and the color unevenness occurs.

  Moreover, when the average particle diameter of precipitation method silica is less than 2.0 micrometers, there exists a possibility that the viscosity of a pressure sensitive adhesive composition may rise and coating suitability may worsen. On the other hand, if the average particle diameter of the precipitated silica exceeds 4.0 μm, there is a risk that printing transfer to the opposite surface is likely to occur due to a decrease in ink fixability.

  On the other hand, if the average particle size of the gel method silica is less than 6.0 μm, the effect of fine irregularities due to the fine particle filler is reduced, and there is a possibility that printing transfer to the opposite surface occurs. On the other hand, if the average particle diameter of the gel method silica exceeds 8.0 μm, the occupancy ratio of the gel method silica having a high ink absorbency on the surface of the coating layer increases, so that the ink fixation is caused by excessive ink absorbability. There is a possibility that the colorability deteriorates and the color developability also deteriorates.

  In the present invention, it is preferable that the fine particle filler contains 10 to 40% by mass of talc, 50 to 70% by mass of precipitated silica, and 10 to 20% by mass of gel silica by solid content. By adopting such a configuration, it is possible to further suppress printing transfer to the facing surface.

  Here, when the blending ratio of talc is less than 10% by mass, the coating layer strength is lowered, and there is a possibility that the pressure roll is soiled. On the other hand, if the blending amount of talc exceeds 40% by mass, the color developability deteriorates, and there is a possibility that printing transfer to the opposite surface may occur due to poor ink absorbability.

  In addition, when the compounding ratio of the precipitated silica is less than 50% by mass, the ink absorbability and fixability are deteriorated, and there is a possibility that printing transfer to the opposite surface occurs. On the other hand, when the compounding ratio of the precipitated silica exceeds 70% by mass, the ink absorbability and fixability are further improved, but the color developability may be deteriorated.

  Moreover, when the compounding ratio of the gel method silica is less than 10% by mass, the ink absorbability of the pressure-sensitive adhesive coating layer is lowered and the color developability may be deteriorated. On the other hand, when the blending amount of the gel method silica exceeds 20% by mass, the blending ratio of the adhesive is relatively lowered, and the gel method silica mixed excessively absorbs the adhesive as well. There is a risk of roll contamination.

  Further, in the present invention, in addition to the main component of the pressure-sensitive adhesive composition, magnesium sulfate is blended in the pressure-sensitive adhesive composition as an ink fixing agent in a solid content of 5 to 15% by mass with respect to the fine particle filler. It is also possible to improve ink colorability and to prevent bleeding by blending magnesium sulfate. This is because magnesium sulfate fixes the colorant pigment in the aqueous pigment ink to the surface of the pressure-sensitive adhesive coating layer, and the ink solvent is absorbed into the coating layer and the ink coloring property is improved. This is because ink bleeding is suppressed. Furthermore, in order to make a co-paper for water-based dye / pigment inks, oligomers or polymers of primary to tertiary amines or quaternary ammonium salts, dimethylamine / epihalohydrin polycondensate, acrylamide / diallylamine copolymer, polyvinyl A cationic resin mainly composed of an amine copolymer, dicyandiamide, dimethyl / diallyl / ammonium chloride or the like may be used in combination.

  The pressure-sensitive adhesive composition of the present invention is blended with wheat starch having an average particle size of 10 to 20 μm by laser diffraction method in a range of 10 to 25 mass% in solid content with respect to the fine particle filler. May be. By blending wheat starch in an appropriate range, the adhesive strength is adjusted appropriately to improve printing transfer to the opposite surface, compared to the case of talc and amorphous silica only on the pressure-sensitive adhesive coating layer surface. Also, large irregularities are generated, and the absorbability of the aqueous pigment ink is further improved.

  In the present invention, a binder is blended in order to improve the strength of the pressure-sensitive adhesive coating layer. Here, as the binder, partially saponified polyvinyl alcohol having a saponification degree of 85 to 90 mol% is used. The reason is not clear, but by using partially saponified polyvinyl alcohol with a saponification degree of 85 to 90 mol% as the binder, the strength of the pressure-sensitive adhesive coating layer is improved and the transfer of printing to the opposite surface is suppressed. can do. Here, when the saponification degree of polyvinyl alcohol exceeds 90 mol%, it is not possible to satisfy the suppression of printing transfer to the opposite surface. On the other hand, when the degree of saponification is less than 85 mol%, the adhesive performance of the pressure-sensitive adhesive coating layer is lowered. If the adhesive performance is reduced, in order to give an appropriate adhesive strength as a pressure-bonded postcard, pressure bonding at a higher pressure is required. However, if pressure bonding at a higher pressure is performed, Printing transition is likely to occur.

  The content of the partially saponified polyvinyl alcohol having a saponification degree of 85 to 90 mol% in the pressure-sensitive adhesive coating layer is preferably 15 to 30% by mass in solid content with respect to the fine particle filler. More preferably, it is 20 to 27% by mass. If the content of the partially saponified polyvinyl alcohol having a saponification degree of 85 to 90 mol% exceeds 30% by mass, the absorptivity of the water-based pigment ink may be impaired, and the suppression of printing transfer to the opposite surface may not be satisfied. is there. On the other hand, if it is less than 15% by mass, the strength of the pressure-sensitive adhesive coating layer is insufficient, and there is a possibility that stains on the pressure roll cannot be suppressed.

  Moreover, as a binder, ethylene-vinyl acetate copolymer resin, acrylic ester resin, complete saponified polyvinyl alcohol, etc. can be used together. Further, various modified polyvinyl alcohols such as silanol modification, carboxyl group modification, acetoacetyl group modification, and cation modification may be used. The total amount of binder in the pressure-sensitive adhesive coating layer is preferably in the range of 15 to 30% by mass in terms of solid content with respect to the fine particle filler.

  In the pressure-sensitive adhesive composition of the present invention, other known additives used in the technical field may be appropriately used as necessary. Examples of such additives include antifoaming agents, thickeners, pH adjusters, lubricants, dispersants, wetting agents, dyes, anti-aging agents, preservatives, and the like. In addition, when using these additives, it is necessary to pay attention to the blending amount so as not to impair the object of the present invention.

In the pressure-sensitive adhesive sheet for ink-jet recording of the present invention, the pressure-sensitive adhesive composition is preferably applied in a range of 3 to 12 g / m ² in terms of solid content on one side of the base paper. Moreover, the coating apparatus for forming the pressure-sensitive adhesive coating layer on the base paper is not particularly limited, and a known coating apparatus used in the general coated paper manufacturing field can be appropriately used. For example, a blade coater, an air knife coater, a roll coater, a reverse roll coater, a curtain coater, a bar coater, a gravure coater, a size press coater, a bill blade coater, or the like can be used.

  Examples of the pressure-sensitive recording paper for ink-jet recording according to the present invention will be specifically described below, but the present invention is not limited thereby. In addition, unless otherwise indicated, the part and% in each Example and a comparative example show a dry mass part and mass%. Moreover, the oil absorption amount of the silica in each Example and Comparative Example represents the oil absorption measured based on ISO 787-5, and talc, precipitated silica, gel silica and wheat starch in each Example and Comparative Example. The average particle diameter of represents a value measured by a laser diffraction method.

<Example 1>
Adjustment of pressure-sensitive adhesive composition: As a fine particle filler, 25 parts by mass of talc (VE-TT, manufactured by Katsumiyama Mining Co., Ltd.) having an average particle size of 6.1 μm, an average particle size of 3.0 μm and an oil absorption of 140 ml 60 parts by mass of sedimentation method silica (Carplex FPS-101, manufactured by Degussa) / 100 g, and gel method silica (silojet P407, manufactured by Grace) having an average particle size of 7.1 μm and an oil absorption of 300 to 330 ml After adding 15 parts by mass to water and adding 2.5 parts by mass of a dispersant and sufficiently dispersing, partially saponified polyvinyl alcohol (hereinafter abbreviated as “partially saponified PVA”) as a binder (JP- 05, degree of saponification: 87-89 mol%, manufactured by Nihon Vineyard-Poval Co., Ltd.) 25 parts by mass, natural rubber-based latex, polymerized with methyl methacrylate as a non-peelable pressure-sensitive adhesive After mixing 115 parts by mass and adding 0.8 parts by mass of a silicone-based antifoaming agent, 10 parts by mass of magnesium sulfate and 15 parts by mass of wheat starch with an average particle diameter of 18 μm are added to form a pressure-sensitive adhesive composition. Paint was created.
Manufacture of pressure-sensitive recording paper for ink-jet recording: Apply the prepared paint to both sides of foam paper with a basis weight of 113 g / m ² with an air knife coater so that the coating amount on each side becomes 6.0 g / m ^{2 in} solid content The ink-jet recording paper was obtained.

<Example 2>
In Example 1, talc (VE-TT, manufactured by Katsumiyama Mining Co., Ltd.) having an average particle diameter of 6.1 μm was changed to talc (Microace P-2, manufactured by Nippon Talc Co., Ltd.) having an average particle diameter of 7.0 μm. A pressure-sensitive adhesive paper for ink-jet recording was obtained in the same manner as in Example 1 except that.

<Example 3>
In Example 1, sedimentation method silica (Carplex FPS-101, manufactured by Degussa) having an average particle size of 3.0 μm and an oil absorption of 140 ml / 100 g was precipitated using an average particle size of 2.0 μm and an oil absorption of 130 ml. A pressure-sensitive adhesive sheet for ink jet recording was obtained in the same manner as in Example 1 except that it was changed to method silica (Mizukasil P-527, manufactured by Mizusawa Chemical Industry Co., Ltd.).

<Example 4>
In Example 1, gel method silica (Silojet P407, manufactured by Grace Co.) having an average particle size of 7.1 μm and an oil absorption of 300 to 330 ml / 100 g was used. The average particle size was 6.6 μm and the oil absorption was 315 ml / 100 g. A pressure-sensitive adhesive paper for ink jet recording was obtained in the same manner as in Example 1, except that the gel method silica was changed to Nipgel AZ-400 (manufactured by Tosoh Silica).

<Example 5>
In Example 1, gel method silica (Silojet P407, manufactured by Grace Co.) having an average particle size of 7.1 μm and an oil absorption of 300 to 330 ml / 100 g was used. The average particle size was 7.4 μm and the oil absorption was 315 ml / 100 g. A pressure-sensitive adhesive paper for ink jet recording was obtained in the same manner as in Example 1 except that the gel method silica (Nipgel AZ-600, manufactured by Tosoh Silica Co., Ltd.) was used.

<Example 6>
In Example 1, sedimentation method silica (Carplex FPS-101, manufactured by Degussa) having an average particle size of 3.0 μm and an oil absorption of 140 ml / 100 g was precipitated using an average particle size of 2.0 μm and an oil absorption of 130 ml. The method silica (Mizukasil P-527, manufactured by Mizusawa Chemical Industry Co., Ltd.) was changed to a gel method silica (Silojet P407, manufactured by Grace Co.) having an average particle size of 7.1 μm and an oil absorption of 300 to 330 ml / 100 g. A pressure-sensitive adhesive sheet for ink jet recording is obtained in the same manner as in Example 1 except that the gel method silica (nip gel AZ-600, manufactured by Tosoh Silica Co., Ltd.) having an average particle size of 7.4 μm and an oil absorption of 315 ml / 100 g is used. It was.

<Example 7>
In Example 1, the amount of talc is changed from 25 parts by mass to 15 parts by mass, the amount of precipitated silica is changed from 60 parts by mass to 65 parts by mass, and the amount of gel method silica is changed from 15 parts by mass. A pressure-sensitive adhesive paper for inkjet recording was obtained in the same manner as in Example 1 except that the amount was changed to 20 parts by mass.

<Example 8>
Inkjet recording was carried out in the same manner as in Example 1, except that the amount of talc was changed from 25 parts by mass to 15 parts by mass and the amount of precipitated silica was changed from 60 parts by mass to 70 parts by mass. A crimping paper was obtained.

<Example 9>
In Example 1, the amount of precipitation method silica was changed from 60 parts by mass to 65 parts by mass, and the amount of gel method silica was changed from 15 parts by mass to 10 parts by mass. A pressure-sensitive adhesive paper for ink jet recording was obtained.

<Example 10>
Inkjet recording was carried out in the same manner as in Example 1 except that the amount of talc was changed from 25 parts by mass to 35 parts by mass and the amount of precipitated silica was changed from 60 parts by mass to 50 parts by mass. A crimping paper was obtained.

<Example 11>
In Example 1, except that the blending amount of natural rubber latex obtained by polymerizing methyl methacrylate on natural rubber as a non-peelable pressure-sensitive adhesive was changed from 115 parts by mass to 100 parts by mass. A pressure-sensitive recording paper for recording was obtained.

<Example 12>
In Example 1, except that the blending amount of natural rubber latex obtained by polymerizing methyl methacrylate on natural rubber as a non-peelable pressure-sensitive adhesive was changed from 115 parts by mass to 130 parts by mass. A pressure-sensitive recording paper for recording was obtained.

<Example 13>
In Example 1, 25 parts by mass of partially saponified PVA (JP-05, degree of saponification: 87-89 mol%, manufactured by Nippon Vinegar Poval Co., Ltd.) was mixed with partially saponified PVA (JP-10, degree of saponification). : 86 to 90 mol%) A pressure-sensitive adhesive sheet for ink jet recording was obtained in the same manner as in Example 1 except that the amount was changed to 25 parts by mass.

<Example 14>
Example 1 in Example 1, except that the blending amount of partially saponified PVA (JP-05, degree of saponification: 87-89 mol%, manufactured by Nihon Vinegar & Poval) was changed from 25 parts by mass to 15 parts by mass. In the same manner as in Example 1, a pressure-sensitive adhesive paper for ink jet recording was obtained.

<Example 15>
Example 1 in Example 1, except that the blending amount of partially saponified PVA (JP-05, degree of saponification: 87 to 89 mol%, manufactured by Nihon Vinegar & Poval) was changed from 25 parts by mass to 30 parts by mass. In the same manner as in Example 1, a pressure-sensitive adhesive paper for ink jet recording was obtained.

<Example 16>
In Example 1, talc (VE-TT, manufactured by Katsumiyama Mining Co., Ltd.) having an average particle size of 6.1 μm was changed to talc (Microace P-6, manufactured by Nippon Talc Co., Ltd.) having an average particle size of 4.0 μm. Except for the above, a pressure-sensitive adhesive paper for ink jet recording was obtained in the same manner as in Example 1.

<Example 17>
In Example 1, talc (VE-TT, manufactured by Katsumiyama Mining Co., Ltd.) having an average particle size of 6.1 μm was changed to talc (Microace K-1, manufactured by Nippon Talc Co., Ltd.) having an average particle size of 8.0 μm. Except for the above, a pressure-sensitive adhesive paper for ink jet recording was obtained in the same manner as in Example 1.

<Example 18>
In Example 1, the amount of talc was changed from 25 parts by mass to 5 parts by mass, the amount of precipitated silica was changed from 60 parts by mass to 70 parts by mass, and the amount of gel method silica was changed from 15 parts by mass. A pressure-sensitive adhesive paper for ink jet recording was obtained in the same manner as in Example 1 except that the amount was changed to 25 parts by mass.

<Example 19>
In Example 1, the amount of talc is changed from 25 parts by weight to 40 parts by weight, the amount of precipitated silica is changed from 60 parts by weight to 40 parts by weight, and the amount of gel silica is changed from 15 parts by weight. A pressure-sensitive adhesive paper for inkjet recording was obtained in the same manner as in Example 1 except that the amount was changed to 20 parts by mass.

<Example 20>
In Example 1, the amount of talc is changed from 25 parts by mass to 10 parts by mass, the amount of precipitated silica is changed from 60 parts by mass to 80 parts by mass, and the amount of gel method silica is changed from 15 parts by mass. A pressure-sensitive adhesive paper for ink jet recording was obtained in the same manner as in Example 1 except that the amount was changed to 10 parts by mass.

<Comparative Example 1>
In Example 1, except that the blending amount of natural rubber latex obtained by polymerizing methyl methacrylate on natural rubber as a non-peelable pressure-sensitive adhesive was changed from 115 parts by mass to 85 parts by mass. A pressure-sensitive recording paper for recording was obtained.

<Comparative example 2>
In Example 1, except that the blending amount of natural rubber latex obtained by polymerizing methyl methacrylate on natural rubber as a non-peelable pressure sensitive adhesive was changed from 115 parts by mass to 150 parts by mass. A pressure-sensitive recording paper for recording was obtained.

<Comparative Example 3>
In Example 1, precipitated silica (Carplex FPS-101, manufactured by Degussa) having an average particle size of 3.0 μm and an oil absorption of 140 ml / 100 g was used. The average particle size was 3.0 μm and the oil absorption was 110 ml / 100 g. A pressure-sensitive adhesive paper for ink jet recording was obtained in the same manner as in Example 1 except that it was changed to a certain precipitation method silica (Mizukasil P-603, manufactured by Mizusawa Chemical Co., Ltd.).

<Comparative example 4>
In Example 1, precipitated silica (Carplex FPS-101, manufactured by Degussa) having an average particle size of 3.0 μm and an oil absorption of 140 ml / 100 g was used. The average particle size was 6.0 μm and the oil absorption was 200 ml / 100 g. A pressure-sensitive adhesive paper for ink-jet recording was obtained in the same manner as in Example 1 except that the precipitation method silica (Mizukasil P-801, manufactured by Mizusawa Chemical Co., Ltd.) was used.

<Comparative Example 5>
In Example 1, gel method silica (Silojet P407, manufactured by Grace Co.) having an average particle size of 7.1 μm and an oil absorption of 300 to 330 ml is used as a gel method with an average particle size of 9.9 μm and an oil absorption of 290 ml / 100 g. A pressure-sensitive adhesive sheet for ink-jet recording was obtained in the same manner as in Example 1 except that it was changed to silica (Nipgel AY-603, manufactured by Tosoh Silica).

<Comparative Example 6>
In Example 1, gel method silica (Silo Jet P407, manufactured by Grace) having an average particle size of 7.1 μm and an oil absorption of 300 to 330 ml is used as a gel method with an average particle size of 5.0 μm and an oil absorption of 400 ml / 100 g. A pressure-sensitive adhesive sheet for ink-jet recording was obtained in the same manner as in Example 1 except that the silica was changed to Sunsphere H-53 (manufactured by AGC S-Tech).

<Comparative Example 7>
In Example 1, the amount of talc was changed from 25 parts by mass to 50 parts by mass, the amount of precipitated silica was changed from 60 parts by mass to 50 parts by mass, and the gel method silica was not used. In the same manner as in Example 1, a pressure-sensitive adhesive paper for ink jet recording was obtained.

<Comparative Example 8>
In Example 1, 25 parts by mass of partially saponified PVA (JP-05, degree of saponification: 87 to 89 mol%, manufactured by Nippon Vinegar Poval Co.) was completely saponified polyvinyl alcohol (V, degree of saponification: A pressure-sensitive adhesive paper for ink jet recording was obtained in the same manner as in Example 1 except that the amount was changed to 25 parts by mass (99 mol% or more, manufactured by Nippon Vinegar Poval).

<Comparative Example 9>
In Example 1, 25 parts by mass of partially saponified PVA (JP05, degree of saponification: 87 to 89 mol%, manufactured by Nippon Vinegar Poval) was used as part of saponified polyvinyl alcohol (JL-05E, degree of saponification: A pressure-sensitive adhesive paper for ink jet recording was obtained in the same manner as in Example 1 except that the content was changed to 25 parts by mass (80 to 84 mol%, manufactured by Nippon Vinegar Poval).

[Preparation of samples for physical property evaluation]
CMYK solid-color printing with aqueous pigment ink was performed on the inkjet pressure-sensitive paper obtained in each Example and Comparative Example using an inkjet printer (Truepress Jet 520, manufactured by SCREEN). Thereafter, the pressure-bonded ink-jet paper after printing was prepared so as to have a moisture content of 5.5 to 7.0%, and 10 cm × 10 cm test pieces were cut and stacked three times, and then dry sealer MS-9200II (large The confidential surfaces provided with the pressure-sensitive adhesive layer were pressure bonded to each other by Nippon Printing Co., Ltd. In addition, when pressurizing and bonding, the sealer gap was manufactured so that the gap was set to be wider than the scale that would normally provide the adhesive strength so that the peel strength immediately after bonding was about 150 g / 25 mm width. The pressure-bonded surfaces of the pressure-bonded paper test pieces thus obtained were peeled off, and various evaluations were performed in the following manner.

[Evaluation of color development]
The color density of the recorded image on the pressure-bonded surface after peeling was visually evaluated. The highest color density was 5 and the lowest color density was 1, which was evaluated in 5 stages.

[Evaluation of transition to opposite surface]
After the pressure-bonding surface was peeled off, it was visually evaluated whether or not the recorded image printed on one pressure-bonded surface had transferred to the opposite surface (the other pressure-bonded surface). Evaluation was made in 5 stages, with 5 being the least transferred to the facing surface and 1 being the most transferred to the facing surface, and 3 or more were evaluated as acceptable.

[Evaluation of dirt on pressure roll]
The pressure-sensitive paper for inkjet recording was pressure-bonded to 10,000 postcards using a dry sealer MS-9200II, and then the degree of dirt on the pressure roll of the dry sealer was visually evaluated. Evaluation was made on a five-point scale, with 5 indicating that the pressure roll was least contaminated and 1 indicating that the pressure roll was most contaminated.

  The composition of the pressure-sensitive adhesive composition paint in Examples and Comparative Examples is shown in FIGS. 1 to 6, and the physical property evaluation results of the pressure-sensitive adhesive paper for ink jet recording obtained in Examples and Comparative Examples are shown in FIGS. Has been.

  As is apparent from the results of FIG. 7, the pressure-sensitive adhesive paper for ink jet recording obtained in Examples 1 to 20 has practical problems in all of the pressure roll contamination, transfer to the opposite surface, and color developability. There was nothing.

(1) Verification of blending ratio of non-peelable adhesive base In Examples 1 to 20, in which 100 to 130 parts by mass of the non-peelable adhesive base is blended with 100 parts by mass of the fine filler, There was no practical problem in any of the contamination of the pressure roll, the transfer to the opposite surface, and the color density.

  On the other hand, in Comparative Example 1 in which 85 parts by mass of the non-peelable adhesive base was blended with 100 parts by mass of the fine particle filler, the printing transfer to the opposite surface was practically less than the acceptable level. Further, in Comparative Example 2 in which 150 parts by mass of the non-peelable adhesive base was blended with 100 parts by mass of the fine particle filler, the color developability deteriorated and was not practically acceptable.

  From the above results, it is considered appropriate that the mixing ratio of the non-peelable pressure-sensitive adhesive base is 100 to 130% by mass in terms of solid content with respect to the fine particle filler.

(2) Verification of average particle diameter of talc Example 1, Examples 3 to 15, Examples 18 to 20 using talc having an average particle diameter of 6.1 μm and talc having an average particle diameter of 7.0 μm are used. In Example 2, stains and color developability of the pressure roll were good, but in Example 16 using talc having an average particle diameter of 4.0 μm compared to these, although it was practically acceptable, The pressure roll is easily soiled. In addition, Example 17 using talc having an average particle size of 8.0 μm was slightly inferior in color developability although it was a practically acceptable level.

  From the above results, it is considered that the average particle diameter of talc is more preferably in the range of 5.0 to 7.0 μm.

(3) Verification of Oil Absorption of Precipitated Silica With regard to the oil absorption of precipitated silica, the ink-jet recording pressure-bonded paper obtained in Examples 1 to 20 is precipitated silica having an oil absorption of 130 to 140 ml / 100 g. No problem was found in practical use in any of the stains on the pressure roll, the printing transfer to the opposite surface, and the color development.

  On the other hand, the pressure-sensitive adhesive paper for inkjet recording using the precipitated silica having an oil absorption of 110 ml / 100 g obtained in Comparative Example 3 was practically less than the acceptable level in printing transfer to the opposite surface. . Further, the pressure-sensitive adhesive paper for ink jet recording using the precipitated silica having an oil absorption of 200 ml / 100 g obtained in Comparative Example 4 was inferior in color developability and practically less than the acceptable level.

  From the above results, it is considered appropriate that the oil absorption amount of the precipitated silica used as the fine particle filler is in the range of 130 to 190 ml / 100 g.

(4) Verification of the average particle size of the precipitation method silica Regarding the average particle size of the precipitation method silica, Examples 1 to 2, Examples 4 to 5 using precipitation method silica having an average particle size of 3.0 μm, and In Examples 7 to 20 and Examples 3 and 6 using 2.0 μm of precipitated silica, there is no practical problem in any of dirt on the pressure roll, printing transfer to the opposite surface, and color development. It was a thing.

  On the other hand, although not shown in the table, precipitated silica having an average particle size of 1.0 μm or less is blended into a pressure-sensitive adhesive composition, which increases the viscosity of the composition and is suitable for coating. It was not. Moreover, although the comparative example 4 which uses the sedimentation method silica whose average particle diameter is 6.0 micrometers is a pass level, it was a little inferior to the printing transfer to an opposing surface.

  From the above results, it is considered that the average particle size of the precipitated silica used as the fine particle filler is more preferably in the range of 2.0 to 4.0 μm.

(5) Verification of oil absorption amount of gel method silica Regarding the oil absorption amount of gel method silica, the pressure-sensitive adhesive paper for ink jet recording obtained in Examples 1 to 20 having an oil absorption amount of 300 to 330 ml / 100 g is colored. There was no practical problem in any of the properties, dirt on the pressure roll, and printing transfer to the opposite surface.

  On the other hand, the pressure-sensitive recording paper for ink jet recording obtained in Comparative Example 5 is the same composition as that of Example 1, except that only gel method silica is changed to an oil absorption of 290 ml / 100 g. It was less than. The pressure-sensitive adhesive paper for ink-jet recording obtained in Comparative Example 6 has the same structure as that of Example 1 except that only gel method silica is changed to an oil absorption of 400 ml / 100 g. However, it was less than the acceptable level for practical use.

  From the above results, it is considered appropriate that the oil absorption amount of the gel silica used as the fine particle filler is in the range of 300 to 330 ml / 100 g.

(6) Verification of average particle diameter of gel method silica Regarding the average particle size of gel method silica, Examples 1 to 3, Examples 7 to 20 using gel method silica having an average particle diameter of 7.1 μm, and In Example 4 using gel method silica having an average particle size of 6.6 μm and Examples 5 to 6 using gel method silica having an average particle size of 7.4 μm, smear of the pressure roll, printing on the opposite surface There was no practical problem in either transfer or color development.

  On the other hand, in Comparative Example 6 using the gel method silica having an average particle diameter of 5.0 μm, the printing transition to the opposite surface was at a pass level but was slightly inferior. Moreover, the comparative example 5 which uses the gel method silica with an average particle diameter of 9.9 micrometers is inferior in color developability, and was less than a pass level practically. Although the oil absorption amount is greatly influenced by this result, considering that the color developability of Example 5 and Example 6 having a relatively large average particle size is slightly inferior to that of Example 1, It is considered that the average particle size of the gel method silica has a considerable influence.

  From the above results, it is considered that the average particle diameter of the gel method silica used as the fine particle filler is more preferably in the range of 6.0 to 8.0 μm.

(7) Verification of blending ratio of talc, precipitated silica, and gelation silica Next, the blending ratio when talc, precipitated silica, and gel silica are used in combination as a fine particle filler is verified. Examples 7 to 10 and Examples 18 to 20 were verified by changing only the mixing ratio of the three in order to verify an appropriate mixing ratio with talc, precipitated silica and gel silica. is there.

  Here, in Example 18, where the talc content is as low as 5% by mass, although it is at an acceptable level, it is inferior to dirt on the pressure roll, while in Example 19, where the talc content is high at 50% by mass, the acceptable level. However, the color developability was inferior.

  Further, in Example 19, where the precipitating silica content is as low as 40% by mass, although it is at an acceptable level, it is inferior to the printing transition of the opposing surface, and in Example 20, where the precipitating silica is high in 80% by mass, it is acceptable. Although it was at a level, it was inferior in color developability.

  Furthermore, in Comparative Example 7 where the blending ratio of the gel method silica is as low as 0% by mass, the color developability is inferior, and in Example 18 where the blending ratio of the gel method silica is as high as 25% by mass, it is an acceptable level. It was inferior to dirt.

  From the above results, it is considered that the fine particle filler is preferably blended in the range of 10 to 40% by mass of talc, 50 to 70% by mass of precipitated silica, and 10 to 20% by mass of gel silica.

Claims (7)

A pressure-sensitive adhesive paper for inkjet recording having a pressure-sensitive adhesive coating layer containing a non-peelable pressure-sensitive adhesive base, a fine particle filler, and a binder on at least one surface of a base paper,
The non-peelable pressure-sensitive adhesive base is blended in a range of 100 to 130% by mass in solid content with respect to the fine particle filler,
The fine particle filler includes at least talc, precipitated silica having an oil absorption measured according to ISO 787-5 of 130 to 190 ml / 100 g, and an oil absorption measured according to ISO 787-5 of 300 to Including gel method silica of 330 ml / 100 g,
A pressure-sensitive adhesive paper for ink-jet recording, comprising partially saponified polyvinyl alcohol having a saponification degree of 85 to 90 mol% as the binder.   The fine particle filler has an average particle diameter by laser diffraction method, the talc is 5.0 to 7.0 μm, the precipitated silica is 2.0 to 4.0 μm, and the gel silica is 6.0. The pressure-sensitive adhesive paper for ink-jet recording according to claim 1, wherein the pressure-sensitive adhesive sheet is from 8.0 to 8.0 μm.   The fine particle filler comprises, as a solid content, 10 to 40% by mass of the talc, 50 to 70% by mass of the precipitated silica, and 10 to 20% by mass of the gel silica. The pressure-sensitive adhesive paper for ink jet recording according to 1 or 2.   The inkjet according to any one of claims 1 to 3, wherein the pressure-sensitive adhesive coating layer further contains magnesium sulfate in a range of 5 to 15 mass% in solid content with respect to the fine particle filler. Crimp paper for recording.   The pressure-sensitive adhesive coating layer further comprises wheat starch having an average particle size of 10 to 20 μm by laser diffraction method in a solid content range of 10 to 25 mass% with respect to the fine particle filler. The pressure-sensitive adhesive paper for ink-jet recording according to any one of claims 1 to 4.   6. The partially saponified polyvinyl alcohol having a saponification degree of 85 to 90 mol% is contained in a range of 15 to 30% by mass with respect to the fine particle filler. Pressure-sensitive recording paper for inkjet recording. A base paper preparation step for preparing a base paper;
Pressure-sensitive adhesive composition using a pressure-sensitive adhesive composition raw material comprising a fine particle filler, a non-peelable pressure-sensitive adhesive base having a solid content of 100 to 130% by mass with respect to the fine particle filler, and a binder A pressure-sensitive adhesive composition adjustment step for adjusting the object,
A pressure sensitive adhesive coating step of applying the pressure sensitive adhesive composition on at least one surface of the base paper to provide a pressure sensitive adhesive coating layer,
The fine particle filler includes talc, precipitated silica having an oil absorption measured according to ISO 787-5 of 130 to 190 ml / 100 g, and an oil absorption measured according to ISO 787-5 of 300 to 330 ml / And 100 g of gel method silica,
The method for producing a pressure-sensitive adhesive paper for ink jet recording, wherein the binder contains partially saponified polyvinyl alcohol having a saponification degree of 85 to 90 mol%.

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