JP6590615B2 - Crimp postcard paper - Google Patents

Description

  The present invention relates to a crimped postcard paper. More specifically, the present invention relates to a post-adhesive type postcard paper for ink jet recording that does not have a pigment coating layer, and is excellent in ink water resistance and printability of fine images such as barcodes.

  The ink jet recording system is a system in which ink droplets are ejected and deposited on recording paper to form dots and recording is performed. In recent years, high-speed recording has become possible due to technological advances in ink jet printers, inks, and recording media.

  Inkjet printer technology is used not only in personal printers used at home, but also in fields such as commercial printing in which variable information is digitized and printed at high speed. That is, in recent years, in the field of commercial printing, a so-called on-demand printing method is being introduced, and many ink jet printers adopting the on-demand printing method have appeared. This on-demand printing method is suitable for printing a small number of copies because information can be directly printed on a medium such as paper without making a plate.

  Conventionally, a crimped postcard is used for notification by post of personal information transmitted to individuals from banks, government offices, insurance companies or credit companies. There are a front paste type and a back paste type in the crimped postcard. The pre-adhesive type postcard is a postcard that is printed on a base plate with a pressure-sensitive adhesive layer and various information is printed thereon and then subjected to a pressure-bonding process. This is called “adhesive” because a pressure sensitive adhesive (glue) is applied to the surface of the base paper before printing various information. The pre-glue type pressure-bonded postcard paper is mainly composed of a pressure-sensitive adhesive layer in combination with a porous pigment such as silica and a natural rubber adhesive.

  On the other hand, a post-adhesive type postcard prints various information on the surface of the base paper, and then applies a pressure-sensitive adhesive to the surface of the printed base paper to provide a pressure-sensitive adhesive layer. It is processed into a crimped postcard. This is called “post glue” because a pressure sensitive adhesive (glue) is applied to the surface of the base paper after printing various information. In the post paste type crimped postcard, a highly transparent resin such as clear varnish is generally used for the pressure sensitive adhesive layer. The post-paste type pressure-bonded postcard paper is advantageous in terms of cost because it does not require the use of a relatively expensive porous pigment and natural rubber adhesive as compared with the pre-paste type pressure-bonded postcard paper.

  As such a post-glue type pressure-bonded postcard paper, a pressure-bonded postcard paper provided with a coating layer mainly composed of an adhesive and a pigment is disclosed (for example, see Patent Document 1).

JP 2008-002033 A

  In recent years, inkjet printers have also been introduced in the field of crimped postcards. In addition, a fine image such as a barcode may be printed on the crimped postcard. Accordingly, the pressure-sensitive postcard paper is required to be printed with a fine image such as a barcode by an ink jet printer. Since the pressure-sensitive postcard sheet described in Patent Document 1 is provided with a coating layer containing a pigment having excellent ink absorbability, it is easy to satisfy the printability of a fine image such as a barcode by an ink jet printer. On the other hand, in order to provide a coating layer containing an adhesive and a pigment, it is not possible to make full use of cost merit, even though it is a post-adhesive type postcard paper. However, the pressure-bonded postcard paper not provided with the coating layer containing the pigment has poor ink absorbability, and it has been difficult to print a fine image such as a barcode with an inkjet printer without bleeding. Furthermore, the post-paste type pressure-bonded postcard paper is required to have a high level of performance (hereinafter sometimes referred to as ink water resistance) that does not flow even when the inkjet printing unit is immersed in water. For example, after printing with an ink jet printer, ink water resistance is required so that ink hardly flows down even when immersed in water. In other words, in a post-adhesive type postcard, a pressure-sensitive adhesive (glue solution) is applied after printing on an ink jet printer, so if the ink water resistance is low, ink flows out when the pressure-sensitive adhesive is applied. High ink water resistance is required.

  Accordingly, an object of the present invention is a post-adhesive type postcard paper having both printability of a fine image such as a barcode by an ink jet printer and water resistance, although it does not have a pigment coating layer. Is to provide.

The pressure-bonded postcard paper according to the present invention is a post-glue type pressure-bonded postcard paper for inkjet recording, and the pressure-bonded postcard paper does not have a pigment coating layer and has a molecular weight of 100,000 to 600,000. containing molecules, Stockigt sizing degree 15 to 150 Byodea is, further, characterized by 0.001~0.050g / ^{m 2} containing a cationic sizing agent. By containing a cationic sizing agent, the printability of fine images such as barcodes can be further improved.

  The crimped postcard paper according to the present invention further contains a rosin sizing agent, and the content of the rosin sizing agent is 0.10 to 0.90 parts by mass with respect to 100 parts by mass of the pulp in the crimped postcard paper. Preferably there is. The Steecht sizing degree can be adjusted within a predetermined range, and the ink water resistance and the printability of a fine image such as a barcode can be further improved.

The crimping postcard paper according to the present invention, the content of the cationic polymer of the pressure-bonded postcard in the paper, 0.10~2.00g / ^m are ^two der basis weight of the crimp postcard paper, 80 it is preferably 180 g / ^{m 2.} Ink water resistance and printability of fine images such as barcodes can be further improved. In the crimped postcard according to the present invention, the cationic polymer may be polyamine, polyamine polyamide epichlorohydrin, polyallylamine, polydiallylamine, polyallylamine hydrochloride, polyethyleneimine, epichlorohydrin modified polyalkylamine, dimethylamine ammonia epichlorohydrin, polyvinyl. Benzyltrimethylammonium halide, polydiacryldimethylammonium halide, polydimethylaminoethyl methacrylate hydrochloride, polyvinylpyridium halide, cationic polyacrylamide, cationic polystyrene copolymer, diallyldimethylammonium chloride polymer, diallyldimethylammonium chloride sulfur dioxide Polymer, copolymer of diallyldimethylammonium chloride amide , Dicyandiamide formalin polycondensate, dicyandiamide diethylenetriamine polycondensate, polyacrylamide resin, polyamide epoxy resin, melamine resin acid colloid, urea resin, cation-modified polyvinyl alcohol, amino acid type amphoteric surfactant, betaine type compound, polyamidine compound, In addition, a quaternary ammonium salt, a cation-modified polyurethane resin, or a copolymer of amine compounds is preferable.

  The present invention provides a post-adhesive type postcard paper having both printability of a fine image such as a barcode by an ink jet printer and water resistance, although it does not have a pigment coating layer. Can do.

  Next, the present invention will be described in detail with reference to embodiments, but the present invention is not construed as being limited to these descriptions. As long as the effect of the present invention is exhibited, the embodiment may be variously modified.

  The pressure-bonded postcard paper according to this embodiment is a post-glue type pressure-bonded postcard paper for inkjet recording, and the pressure-bonded postcard paper does not have a pigment coating layer and has a molecular weight of 60,000 to 600,000. Contains molecules and has a Steecht sizing degree of 15 to 150 seconds.

  The pressure-bonded postcard paper according to this embodiment has pulp as a main component. As the pulp used here, as chemical pulp, LBKP (hardwood bleached kraft pulp) or NBKP (softwood bleached kraft pulp), etc .; as mechanical pulp, GP (ground wood pulp), PGW (pressurized ground wood pulp), RMP (refinery mechanical) Pulp), TMP (thermomechanical pulp), CTMP (chemithermomechanical pulp), CMP (chemimechanical pulp), CGP (chemiground pulp), etc .; as recycled pulp, DIP (deinked pulp), etc .; or as non-wood pulp There are kenaf, bagasse, bamboo or cotton. These can be used alone or in combination at any ratio. In addition, a synthetic fiber can be further blended within a range that does not impair the object and effect of the present invention. It is desirable to blend ECF (Elemental Chlorine Free) pulp or TCF (Totally Chlorine Free) pulp with low environmental impact. In paper, known fillers such as heavy calcium carbonate, light calcium carbonate, magnesium carbonate, titanium oxide, synthetic silica, alumina, talc, calcined kaolin clay, kaolin clay, bentonite, zeolite, aluminum hydroxide or zinc oxide, Various paper making chemicals such as known paper strength agents, sulfuric acid bands, yield improvers, dyes, or fluorescent dyes may be used as long as the effects of the present invention are not impaired. The pressure-bonded postcard paper can be made by applying a known paper machine such as a circular paper machine, a long paper machine, or a twin wire paper machine using a pulp-based material. You can make paper or multi-layer paper. Further, a size press solution or a gate roll coater coating solution containing a known water-soluble polymer such as starch, polyvinyl alcohol or polyacrylamide is applied to the surface of the paper using a size press or a gate roll coater. May be.

  The pressure-bonded postcard according to the present embodiment contains a cationic polymer having a molecular weight of 60,000 to 600,000. The method for incorporating the cationic polymer into the paper may be added to the stock, or may be added to the size press solution or the gate roll coater coating solution, and is not particularly limited. . The molecular weight of the cationic polymer can be measured, for example, by gel permeation chromatography. In addition, the molecular weight as used in the field of this invention is a weight average molecular weight.

  The cationic polymer used here functions as a fixing agent for inkjet inks. For example, polyamine resins such as polyamine, polyamine polyamide epichlorohydrin, polyallylamine, polydiallylamine or polyallylamine hydrochloride, polyethyleneimine, Epichlorohydrin-modified polyalkylamine, dimethylamine ammonia epichlorohydrin, polyvinylbenzyltrimethylammonium halide, polydiacryldimethylammonium halide, polydimethylaminoethyl methacrylate hydrochloride, polyvinylpyridium halide, cationic polyacrylamide, cationic polystyrene copolymer, diallyldimethyl Ammonium chloride polymer, diallyldimethylammonium chloride Sulfur oxide copolymer, diallyldimethylammonium chloride amide copolymer, dicyandiamide formalin polycondensate, dicyandiamide diethylenetriamine polycondensate, polyacrylamide resin, polyamide epoxy resin, melamine resin acid colloid, urea resin, cation-modified polyvinyl alcohol, An amino acid type amphoteric surfactant, a betaine type compound, a polyamidine compound, other quaternary ammonium salts, or a cation-modified polyurethane resin. These may be used alone or in combination of two or more. In the present invention, it is preferable to use a polyamine resin from the viewpoint of fading. The polyamine-based resin may be a copolymer of amine compounds or a copolymer of an amine compound and another compound in addition to the above-described compound. The copolymer of amine compounds is, for example, a copolymer of allylamine hydrochloride and diallylamine hydrochloride. Moreover, the copolymer of an amine compound and another compound is, for example, a copolymer of diallylamine and acrylamide.

The molecular weight of the cationic polymer is 60,000 to 600,000. When the molecular weight is less than 60,000, the ink is poor in water resistance. If it exceeds 600,000, the ink absorbability of the paper is deteriorated and the printability of a fine image such as a barcode is inferior. The molecular weight of the cationic polymer is preferably 80,000 to 500,000, more preferably 15 to 400,000. In the present embodiment, the content of the cationic polymer in the paper is preferably 0.10 to 2.00 g / m ² . If the content of the cationic polymer is less than 0.10 g / m ² , the ink water resistance may be poor. If it exceeds 2.00 g / m ² , the printability of a fine image such as a barcode may be inferior. The content of the cationic polymer in the paper is more preferably 0.20 to 1.50 g / m ² .

  It is preferable that the pressure-bonded postcard according to the present embodiment further contains a cationic sizing agent. The printability of a fine image such as a barcode can be further improved. The method for incorporating the cationic sizing agent into the paper is not particularly limited, and may be added to the paper stock or may be added to the size press solution or the gate roll coater coating solution. Since the cationic sizing agent has good compatibility with the cationic polymer, the cationic sizing agent and the cationic polymer are added simultaneously to the coating liquid to be applied in the stock or with a size press or a gate roll coater. It is also possible to apply. Further, after applying a coating liquid containing one of a cationic polymer or a cationic sizing agent, a coating liquid containing the other of the cationic polymer or the cationic sizing agent may be applied, One of the cationic polymer or the cationic sizing agent may be added to the liquid, and the other of the cationic polymer or the cationic sizing agent may be added to the size press liquid or the gate roll coater liquid.

Examples of the cationic sizing agent used here include known sizes such as alkyl ketene dimer (AKD), alkenyl succinic anhydride (ASA), styrene / acrylic copolymer, styrene / methacrylic copolymer, or rosin sizing agent. It is an agent and its ionicity is cationic. These may be used alone or in combination of two or more. Since the ink-jet ink is anionic, by containing a cationic sizing agent, the fixability of the ink is appropriately improved and bleeding is eliminated, and the printability of a fine image such as a barcode can be further improved. In the present invention, the content of the cationic sizing agent in the paper is preferably 0.001 to 0.100 g / m ² . More preferably, it is 0.005-0.050 g / m < ² >. Most preferably, it is 0.006-0.020 g / m < ² >. If the content of the cationic sizing agent is less than 0.001 g / m ² , the ink may bleed and the printability of a fine image such as a barcode may be inferior. On the other hand, if it exceeds 0.100 g / m ² , the ink drying property is lowered, and ink drying failure may occur particularly in printing by a high-speed inkjet printer.

  The pressure-sensitive postcard paper of the present invention has a Steecht sizing degree (JIS P8122: 2004) of 15 to 150 seconds. More preferably, it is 17 to 140 seconds. When the Steecht sizing degree is less than 15 seconds, the ink is blurred and the printability of a fine image such as a barcode is inferior. Further, the ink water resistance tends to be inferior. When the Steecht sizing degree exceeds 150 seconds, the ink drying property is lowered, and ink drying failure occurs particularly in printing by a high-speed ink jet printer. As a method for adjusting the steecht size, a known adjustment method in the papermaking technology can be used. For example, the type and amount of the sizing agent added to the paper stock, the addition to the size press solution or the gate roll coater coating solution The type of surface sizing agent to be adjusted and the amount of addition can be mentioned.

  The crimped postcard paper according to the present embodiment further contains a rosin sizing agent, and the content of the rosin sizing agent is 0.10 to 0.90 parts by mass with respect to 100 parts by mass of the pulp in the crimped postcard paper. It is preferable. More preferably, it is 0.20 to 0.70 parts by mass. The Steecht sizing degree can be adjusted within a predetermined range, and the ink water resistance and the printability of a fine image such as a barcode can be further improved. The rosin sizing agent is, for example, a nonionic rosin sizing agent, an anionic rosin sizing agent or a cationic rosin sizing agent. Of these, nonionic rosin sizing agents are more preferred because they are more effective in improving ink water resistance and printability of fine images. The rosin sizing agent may be blended in the paper stock, or may be blended in a size press solution or a gate roll coater coating solution.

The crimped postcard according to the present embodiment can be subjected to a calendar process such as a machine calendar, a soft calendar, and a super calendar, and can also be subjected to a smoothing process. The basis weight is preferably 80 to 180 g / m ² in consideration of postcard use. More preferably 90~160g / ^{m 2.} If it is less than 80 g / m ² , the basis weight of the pressure-bonded postcard paper may be too low to satisfy various strengths. When it exceeds 180 g / m ² , there is a possibility that the thickness when folded will be too large, and the suitability for processing such as crimping may be impaired.

  The pressure-bonded postcard paper according to this embodiment is a so-called non-coated paper that does not have a pigment coating layer. The pigment coating layer is a coating layer that is provided on the surface of paper or on a treated surface such as a size press or a gate roll coater and contains a pigment and an adhesive. The pigment is a general coating pigment used for coated paper, such as kaolin, talc, heavy calcium carbonate, light calcium carbonate, magnesium carbonate, barium sulfate, calcium sulfate, titanium dioxide, zinc oxide, sulfuric acid. Inorganic pigments such as zinc, zinc carbonate, calcium silicate, aluminum silicate, magnesium silicate, diatomaceous earth, aluminum hydroxide or magnesium hydroxide, or organic pigments such as acrylic, styrene, ethylene, vinyl chloride or nylon. The adhesive is a general coating adhesive used for coated paper, and includes, for example, polyvinyl alcohol (including modified polyvinyl alcohol such as silanol-modified polyvinyl alcohol and carboxyl-modified polyvinyl alcohol), styrene-butadiene latex, and polyvinyl. Acetal, oxidized starch, etherified starch, carboxymethylcellulose, hydroxyethylcellulose, casein, gelatin, soy protein, polyethyleneimide resin, polyvinylpyrrolidone resin, polyacrylic acid or copolymer thereof, maleic anhydride copolymer, acrylamide system Resin, Acrylic ester resin, Polyamide resin, Polyurethane resin, Polyester resin, Polyvinyl butyral resin, Alkyd resin, Epoxy resin, Epichlorohydrin Acrylic polymer latex such as oil, urea resin, styrene-butadiene copolymer, methyl methacrylate-butadiene copolymer, acrylic ester, methacrylic ester polymer or copolymer, or ethylene-vinyl acetate copolymer Vinyl polymer latexes such as polymers.

  The pressure-bonded postcard paper according to the present embodiment is a post-paste type pressure-bonded postcard paper, and a pressure-sensitive adhesive layer is provided after information is printed on either side of the paper. In the pressure-bonded postcard according to this embodiment, either side of the paper may be a surface on which a pressure-sensitive adhesive layer is provided. By not specifying the surface on which the pressure-sensitive adhesive is provided, management of the front and back is unnecessary.

  The pressure-bonded postcard according to the present embodiment is compatible with a commercial high-speed inkjet printer. High speed means, for example, that the printing speed exceeds 50 m / min in rotary printing, and exceeds 100 sheets / min in sheet-fed printing. In the case of rotary printing, the printing speed is more preferably 100 m / min or more. The upper limit of the printing speed is not particularly limited, but is preferably 500 m / min or less, and more preferably 300 m / min or less. In the case of sheet-fed printing, the printing speed is more preferably 200 sheets / minute or more. The upper limit of the printing speed is not particularly limited, but is preferably 15000 sheets / minute or less, and more preferably 10,000 sheets / minute or less.

  Next, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples. In the examples, “parts” and “%” represent “parts by mass” and “mass%”, respectively, unless otherwise specified. The number of added parts is a value in terms of solid content.

Example 1
100 parts hardwood bleached kraft pulp (Canada standard freeness 475 ml CSF), 0.4 part starch (Neotac 30T: made by Nippon Food Processing Co., Ltd.), 0.39 parts nonionic rosin sizing agent (CC167: made by Seiko PMC) Were dispersed in water, and light calcium carbonate (PC-700: manufactured by Shiroishi Kogyo Co., Ltd.) was added so that the ash content after papermaking would be 9% to obtain a paper stock. This stock was made using a long paper machine to obtain a paper sheet (single-layer paper making). Thereafter, 5% of oxidized starch (MS # 3800: manufactured by Nippon Shokuhin Kako Co., Ltd.) and a polyamine-based resin which is a cationic polymer as an ink fixing agent (DK6853: manufactured by Seiko PMC Co., Ltd., molecular weight 500,000) 3% and 0.05% styrene-acrylic copolymer (Harsize CP-960E: Harima Kasei Co., Ltd.) mixed as a cationic sizing agent was dried on both sides of the paper sheet. Was applied with a size press so that the thickness was 2.0 g / m ^{2 on} both sides, and dried with a cylinder dryer to prepare a pressure-sensitive postcard paper having a basis weight of 120 g / m ² .

(Example 2)
In Example 1, the same procedure as in Example 1 was performed except that the addition amount of polyamine-based resin (DK6853: manufactured by Seiko PMC Co., Ltd., molecular weight: 500,000) as the ink fixing agent was changed to 0.7%. A crimped postcard paper was prepared.

(Example 3)
In Example 1, a pressure-bonded postcard was obtained in the same manner as in Example 1 except that the addition amount of polyamine resin (DK6853: manufactured by Seiko PMC Co., Ltd., molecular weight: 500,000) as a cationic polymer was changed to 10%. A paper was prepared.

Example 4
In Example 1, the cationic sizing agent was changed from 0.05% of a styrene-acrylic copolymer (Harsize CP-960E: manufactured by Harima Chemical Co.) to a cationic alkyl ketene dimer (SE2360: manufactured by Seiko PMC). A crimped postcard paper was produced in the same manner as in Example 1 except that the content was changed to 05%.

(Example 5)
In Example 1, 3% of a polyamine resin (DK6853: manufactured by Seiko PMC, molecular weight 500,000), which is a cationic polymer as an ink fixing agent, was mixed with allylamine hydrochloride and diallylamine hydrochloride as polyamine resins. A pressure-sensitive postcard paper was prepared in the same manner as in Example 1 except that the polymer (PAA-D11-HCL: Nittobo Co., Ltd., molecular weight 100,000) was changed to 3%.

( Reference Example 6)
In Example 1, 3% of a polyamine resin (DK6853: manufactured by Seiko PMC Co., Ltd., molecular weight: 500,000), which is a cationic polymer as an ink fixing agent, was added to an epichlorohydrin-based quaternary ammonium salt (Papiogen P-126: manufactured by Senka Co.). , Molecular weight 60,000) A pressure-sensitive postcard paper was produced in the same manner as in Example 1 except that the molecular weight was changed to 3%.

(Example 7)
A pressure-sensitive postcard paper was prepared in the same manner as in Example 1 except that the amount of nonionic rosin sizing agent (CC167: Starlight PMC) added was 0.20 part.

(Example 8)
A pressure-sensitive postcard paper was prepared in the same manner as in Example 1 except that the amount of nonionic rosin sizing agent (CC167: Starlight PMC) added was 0.70 part.

Example 9
A pressure-sensitive postcard paper was produced in the same manner as in Example 1 except that the amount of nonionic rosin sizing agent (CC167: Starlight PMC) added was 0.18 part.

(Example 10)
In Example 1, 3% of a polyamine resin (DK6853: manufactured by Seiko PMC Co., Ltd., molecular weight: 500,000) as a cationic polymer as an ink fixing agent was mixed with a diallylamine / acrylamide copolymer (HP-780A) as a polyamine resin. : Manufactured by Senka Co., Ltd., molecular weight 600,000).

( Reference Example 11)
In Example 1, a pressure-bonded postcard paper was produced in the same manner as Example 1 except that no cationic sizing agent was added.

(Example 12)
In Example 1, the same procedure as in Example 1 was performed except that the addition amount of polyamine-based resin (DK6853: manufactured by Seiko PMC Co., Ltd., molecular weight: 500,000) as the ink fixing agent was 0.27%. A crimped postcard paper was prepared.

(Example 13)
In Example 1, the nonionic rosin sizing agent was not blended, and instead an anionic rosin sizing agent (size pine NT-78: manufactured by Arakawa Chemical Co., Ltd.) 0.30 part was blended in the same manner as in Example 1. Crimped postcard paper was made.

(Comparative Example 1)
In Example 1, 3% of a polyamine resin (DK6853: manufactured by Seiko PMC Co., Ltd., molecular weight: 500,000), which is a cationic polymer as an ink fixing agent, was added to an epichlorohydrin quaternary ammonium salt (Papiogen P-105: manufactured by Senka Co., Ltd.) , Molecular weight 20,000) A pressure-sensitive postcard paper was prepared in the same manner as in Example 1 except that it was changed to 3%.

(Comparative Example 2)
A pressure-sensitive postcard paper was produced in the same manner as in Example 1 except that the amount of nonionic rosin sizing agent (CC167: Starlight PMC) added was 0.05 parts.

(Comparative Example 3)
A pressure-sensitive postcard paper was produced in the same manner as in Example 1 except that the amount of nonionic rosin sizing agent (CC167: Starlight PMC) added was 0.95 part.

(Comparative Example 4)
In Example 1, 3% of polyamine resin (DK6853: manufactured by Seiko PMC Co., Ltd., molecular weight: 500,000) as a cationic polymer as an ink fixing agent was mixed with diallyldimethylammonium hydrochloride (HP-46A: manufactured by Senka Co., Ltd., molecular weight). 700,000) A crimped postcard paper was produced in the same manner as in Example 1 except that the content was changed to 3%.

(Comparative Example 5)
In Example 1, a pressure-bonded postcard paper was produced in the same manner as Example 1 except that the cationic polymer was not blended.

  The following tests were carried out on the pressure-bonded postcard papers obtained in the examples and comparative examples, and the results are shown in Tables 1 and 2.

(1) Steecht size:
In accordance with JIS P8122: 2004 “Paper and paperboard—Sizing test method—Steecht method”, the Skeucht sizing degree was measured.

(2) Ink water resistance:
Using a commercial ink jet printing machine (MJP30A: manufactured by Miyakoshi Co., Ltd.), solid portions of black, cyan, magenta and yellow were printed with a water-based dye ink at a printing speed of 100 m / min and left for 1 hour. Thereafter, the printed matter was immersed in water for 1 minute, and the ink flow-off state was visually evaluated.
A: Ink does not flow at all and can be used practically.
○: Ink flows slightly, but can be used practically.
Δ: Ink flows and impractical.
X: The ink remarkably flows and is not practical.

(3) Barcode printing suitability:
Ten identical barcodes (compliant with EAN128) were printed with a water-based dye black ink using a commercial inkjet printer (MJP30A: manufactured by Miyakoshi). Using a barcode detector (trade name: QUICK CHECK PC600: manufactured by Honeywell), each barcode was detected and evaluated as follows (for each sample, a total of 10 detection tests were conducted) Become). The determination result output by the barcode detector is any one of A determination, B determination, C determination, D determination, and F determination every time detection is performed. Readability is high and good.
(Double-circle): The determination more than C determination (A determination, B determination, or C determination) becomes 7 times-10 times, and can be used practically.
○: The determination more than the C determination is 4 to 6 times, which is practical.
(Triangle | delta): The determination more than C determination becomes 1 to 3 times, and is impractical.
X: The determination more than C determination becomes 0 times, and cannot be used practically.

  As is clear from Table 1, the pressure-bonded postcard papers obtained in Examples 1 to 13 were excellent in ink water resistance and barcode printability. Even when a pressure sensitive adhesive is applied to a pressure-sensitive adhesive after printing a fine image including a barcode on the pressure-bonded postcard paper, the ink does not flow almost due to its excellent water resistance. It was possible to obtain a crimped postcard that could be read without problems.

  On the other hand, as is clear from Table 2, the pressure-bonded postcard paper obtained in Comparative Example 1 was inferior in ink water resistance because the molecular weight of the cationic polymer as the ink fixing agent was less than 60,000. It was. Further, the pressure-bonded postcard paper obtained in Comparative Example 2 was inferior in bar code printing suitability because the Steecht sizing degree was less than 15 seconds, so that the ink oozed out. In addition, since the pressure-sensitive postcard paper obtained in Comparative Example 3 has a Steecht sizing degree exceeding 150 seconds, poor ink drying occurs and ink stains occur around the barcode, making it suitable for barcode printing. inferior. In addition, the pressure-bonded postcard paper obtained in Comparative Example 4 has a molecular weight of the cationic polymer, which is an ink fixing agent, exceeding 600,000, resulting in poor ink drying and ink stains around the barcode. It was inferior in barcode printing suitability. The pressure-bonded postcard paper obtained in Comparative Example 5 was inferior in ink water resistance and barcode printability because it did not contain a cationic polymer.

Claims (4)

A post-adhesive postcard paper for inkjet recording,
Piezoelectric deposition postcard paper has no pigment coating layer, molecular weight by weight of from 100,000 to 600,000 a cationic polymer, Ri Stockigt sizing degree 15 to 150 Byodea,
Furthermore, the pressure- sensitive postcard paper characterized by containing 0.001 to 0.050 g / m ^{2 of} a cationic sizing agent . In addition, it contains a rosin sizing agent,
Crimping postcard paper of claim 1 in which the content of the rosin sizing agent, characterized in that it is a 0.10 to 0.90 parts by weight per 100 parts by weight pulp of the crimping postcard in the paper. The content of the cationic polymer in the pressure-bonded postcard paper is 0.10 to 2.00 g / m ² ,
The basis weight of the crimp postcard paper, crimping postcard paper of claim 1 or 2, characterized in that a 80~180g / ^{m 2.} The cationic polymer is polyamine, polyamine polyamide epichlorohydrin, polyallylamine, polydiallylamine, polyallylamine hydrochloride, polyethyleneimine, epichlorohydrin modified polyalkylamine, dimethylamine ammonia epichlorohydrin, polyvinylbenzyltrimethylammonium halide, polydiacryldimethylammonium halide, Polydimethylaminoethyl methacrylate hydrochloride, polyvinylpyridium halide, cationic polyacrylamide, cationic polystyrene copolymer, diallyldimethylammonium chloride polymer, diallyldimethylammonium chloride sulfur dioxide copolymer, diallyldimethylammonium chloride amide copolymer , Dicyandiamide formalin polycondensation , Dicyandiamide diethylenetriamine polycondensate, polyacrylamide resin, polyamide epoxy resin, melamine resin acid colloid, urea resin, cation-modified polyvinyl alcohol, amino acid type amphoteric surfactant, betaine type compound, polyamidine compound, other quaternary ammonium salts The pressure-bonded postcard paper according to any one of claims 1 to 3 , which is a copolymer of a cation-modified polyurethane resin or an amine compound.