JP2015036408A - Composition for forming print fixed layer, and medium with print fixed layer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composition for forming a print fixed layer, which provides the print fixed layer having excellent print characteristics and excellent handleability.SOLUTION: A composition for forming a print fixed layer comprises binder resin, inorganic fine particles, and fluororesin fine particles of 10 pts.wt.or more relative to the weight of the binder resin.

Description

  The present invention relates to a composition for forming a print fixing layer, a print fixing layer formed thereby, a print medium having the print fixing layer, and a passbook having the print fixing layer. In particular, the present invention relates to a composition for forming a print fixing layer having good handleability and excellent printability, a print fixing layer formed thereby, and a print medium having the print fixing layer. The printing medium of the present invention is a bankbook for financial institutions in particular.

  As shown in FIG. 1, the cover of the bankbook (10) used in a financial institution such as a bank has the name of the account holder on the surface (1) of the cover made of cloth cloth or paper cloth processed with resin. For example, a print fixing layer (2) is provided. For example, Patent Document 1 discloses a passbook having a print fixing layer containing a print fixing agent such as silica and a curable resin.

  Patent Document 2 discloses a medium having a print fixing layer containing inorganic fine particles such as silica, a resin, and wax. Here, since the print fixing layer contains wax, the scratch resistance of the print fixing layer is improved.

  In Patent Document 3, it is a plastic card having a print fixing layer, and the print recording layer is an acrylic resin as a main component, a vinyl acetate resin as a binder, 0.5 to 2.8% by mass of a particulate polyethylene wax, And a plastic card comprising 0.2 to 0.5% by weight of finely divided polytetrafluoroethylene wax.

Japanese Utility Model Publication No. 58-17172 JP 2002-79618 A JP 2010-131753 A

  In the passbook and the like including the above-mentioned fixing of the printing layer, although the printing characteristics are improved, there is still room for improvement with respect to the printing characteristics. In addition, in automatic issue machines such as bankbooks and automatic carry-over machines, delivery may not be performed normally, leaving room for improvement in handling.

  Therefore, an object of the present invention is to provide a composition for forming a print fixing layer that solves these problems, a print fixing layer formed thereby, and a print medium having the print fixing layer.

The present inventors have found that the above problems can be solved by the following means.
[1] A composition for forming a print fixing layer comprising a binder resin, inorganic fine particles, and 10 parts by weight or more of fluorine-based resin fine particles based on the weight of the binder resin.
[2] The composition for forming a print fixing layer according to [1], wherein the wax is 10 parts by weight or less based on the weight of the binder resin.
[3] The composition for forming a print fixing layer according to [1] or [2], wherein the fluororesin fine particles are 90 parts by weight or less based on the weight of the binder resin.
[4] The fluororesin fine particles are composed of monofluoroethylene resin, difluoroethylene resin, trifluoroethylene resin, tetrafluoroethylene resin, tetrafluoroethylene / hexafluoropropylene copolymer resin, derivatives thereof, and mixtures thereof. The composition for forming a print fixing layer according to any one of [1] to [3], which is fine particles of a resin selected from the group consisting of:
[5] The binder resin according to [1] to [4], wherein the binder resin is selected from the group consisting of polyester, polyacrylate, polyvinyl chloride, polyvinyl acetate, polyamide, polystyrene, and derivatives thereof, and mixtures thereof. The composition for forming a print fixing layer according to any one of the above.
[6] The inorganic fine particles are selected from the group consisting of silica, talc, kaolin, clay, alumina white, calcium carbonate, magnesium carbonate, aluminum sulfate, barium sulfate, and mixtures thereof [1] to [5] The composition for forming a print fixing layer according to any one of the above.
[7] A print fixing layer formed by the composition for forming a print fixing layer according to any one of [1] to [6].
[8] A print medium comprising the print fixing layer of [7].
[9] A bankbook including the print fixing layer of [7].

  According to the present invention, it is possible to provide a print medium with a print fixing layer having a print fixing layer having excellent print characteristics and excellent handleability, particularly a bankbook for a financial institution.

It is the schematic of the passbook which is one embodiment of this invention. It is the schematic of the apparatus for measuring a static friction coefficient.

≪Composition for printing fixing layer≫
The composition for forming a print fixing layer of the present invention contains 10 parts by weight or more of fluororesin fine particles with respect to the weight of the binder resin, inorganic fine particles, and binder resin.

  The passbook is held in an automatic manner in the automatic issuing machine and the automatic carry-over machine such as a passbook. When a new passbook is sent out in the machine, the passbook to be sent out is rubbed with the adjacent passbook. The inventors of the present invention have found that the cause of the failure of sending out the passbook is due to rubbing between the passbooks, and that the delivery failure can be improved by lowering the friction coefficient of the print fixing layer.

  In this regard, even in a conventional composition for forming a print fixing layer using wax, the friction coefficient of the print fixing layer can be reduced by containing a large amount of wax. However, the print fixing layer formed by containing a large amount of wax deteriorates the printing characteristics. In contrast, the present inventors have unexpectedly provided that the composition for forming a print fixing layer of the present invention using fluororesin fine particles provides a print fixing layer having a low friction coefficient and good print characteristics. I found.

(Binder resin)
The binder resin used in the present invention is not particularly limited as long as it fixes inorganic fine particles or the like on the substrate forming the print fixing layer. For example, shellac, rosin and derivatives thereof, nitrified cotton and fiber derivatives, polyamide, Polyacrylate, polyvinyl chloride, polyvinyl acetate, polystyrene, petroleum resin, cyclized rubber, chlorinated rubber, chlorinated polypropylene, polyurethane, epoxy resin, polyester, vinyl chloride-vinyl acetate copolymer, butyral resin, polyvinylidene chloride, A water-soluble resin or the like can be used. Alternatively, a UV ink containing a prepolymer that is copolymerized and cured by ultraviolet rays may be used. Examples of the copolymerizable compound used therefor include polyol acrylate, polyester acrylate, epoxy acrylate, urethane acrylate, and alkyd acrylate.

  Among these, polyester, polyacrylate, polyvinyl chloride, polyvinyl acetate, polyamide, and polystyrene are preferably used. In addition, as a binder resin, you may mix and use 2 or more types from the said substance. In preparing the composition for forming a print fixing layer, these resins may be provided as a dispersion or a solution in a liquid medium.

(Inorganic fine particles)
The inorganic fine particles used in the present invention need only have a property of receiving printing ink and the like. As the inorganic fine particles, for example, silica, talc, kaolin, clay, alumina white, calcium carbonate, magnesium carbonate, aluminum sulfate, barium sulfate and the like can be used, and porous inorganic fine particles can be preferably used. In addition, as said inorganic fine particle, you may mix and use 2 or more types from the said substance. Among these, porous silica is particularly preferable.

  As the particle size of the inorganic fine particles used in the present invention, those having a median diameter (d50) of 0.1 to 50 μm can be used, and preferably the median diameter is 0.5 to 20 μm, 1.0 to 10 μm, or 2 It is preferable that it is 0.0-8.0 micrometers. Here, the median diameter can be measured using a “model LS-230” (laser diffracted light scattering method) particle size distribution analyzer manufactured by Beckman Coulter. In this case, water is used as a solvent and 200 W output is dispersed for 1 minute using a homogenizer as a sample.

Inorganic fine particles used in the present invention is preferably a porous material, the specific surface area ^{value, 0.1~2000m 2 /g,0.5~500m} 2 / ^g, or, 1.0~50m ² / It is preferable that it is g. The BET method specific surface area can be measured using a measuring machine “4-SORB U2” manufactured by Yuasa Ionics.

(Fluorine resin fine particles)
The composition for forming a print fixing layer of the present invention contains 10 or more parts by weight of fluororesin fine particles with respect to the weight of the binder resin. Preferably, the fluororesin fine particles are contained in an amount of 20 parts by weight or more, 30 parts by weight or more, or 40 parts by weight or more based on the weight of the binder resin, and 150 parts by weight or less, 120 parts by weight or less, 100 parts by weight or less. , 90 parts by weight or less, or 80 parts by weight or less. When included in such a range, the obtained print fixing layer has a sufficiently low coefficient of friction, and has good print characteristics such as print density and print fixability when printed.

  The fluororesin fine particles used in the present invention are preferably fluoroolefin resin fine particles. The fluoroolefin resin is usually a polymer or copolymer containing a fluoroethylene structure. Specific examples thereof include monofluoroethylene resin, difluoroethylene resin, trifluoroethylene resin, tetrafluoroethylene resin, tetrafluoroethylene / hexafluoro. Examples include propylene copolymer resins, derivatives thereof, and mixtures thereof, among which tetrafluoroethylene resin (polytetrafluoroethylene, PTFE) is preferable.

  The median diameter (d50) of the fluororesin fine particles used in the present invention is preferably 0.1 to 20 μm, 0.5 to 15 μm, 1.0 to 10 μm, or 2.0 to 8.0 μm. This particle size can be measured using a “Model LS-230” (laser diffraction light scattering method) particle size distribution measuring machine manufactured by Beckman Coulter.

  The fluororesin fine particle resin used in the present invention preferably has a relatively low molecular weight, and its heat resistance temperature is preferably in the range of 100 ° C to 500 ° C, 150 ° C to 400 ° C, or 200 ° C to 300 ° C. . Here, the heat resistant temperature means a temperature at which 80% or more of the fluororesin fine particles can maintain the shape of the particles when heated to that temperature.

(Other ingredients-wax)
The composition for forming a print fixing layer of the present invention preferably has a wax content of 10 parts by weight or less, 5 parts by weight or less, 3 parts by weight or less, 1 part by weight or less, 0.5 parts by weight based on the weight of the binder resin. Part or less, or 0.1 part by weight or less. The composition may be substantially free of wax.

  Here, the wax is a substance that is solid at normal temperature and is liquefied and oily at 150 ° C., 120 ° C., 100 ° C., 80 ° C., or 60 ° C. As used herein, the term “wax” is used. Does not contain the above-mentioned fluororesin fine particles. Examples of such wax include petroleum wax (paraffin wax, microcrystalline wax, etc.), plant wax (carnauba wax, candelilla wax, rice wax, wood wax, etc.), animal wax (beeswax, whale wax, etc.). And mineral waxes (montan wax, ozokerite, ceresin, etc.), synthetic waxes (polyethylene wax, Fischer-Tropsch wax, amide wax, hardened castor oil, etc.).

(Other components-solvent)
The composition for forming a print fixing layer of the present invention may contain a solvent for coating when forming the print fixing layer. As such a solvent, the binder resin component and other additives described above are dissolved or dispersed so that the composition for forming a print fixing layer of the present invention can be suitably applied to a substrate, and after coating, The solvent is not particularly limited as long as it can be easily dried. Examples of such solvents include water, alcohols (eg, methanol, ethanol, propanol, isopropanol, n-butanol, s-butanol, t-butanol, benzyl alcohol, PGME, ethylene glycol), ketones (eg, acetone, Methyl ethyl ketone, methyl isobutyl ketone, cyclopentanone, cyclohexanone, heptanone, diisobutyl ketone, diethyl ketone), aliphatic hydrocarbon (eg, hexane, cyclohexane), halogenated hydrocarbon (eg, methylene chloride, chloroform, carbon tetrachloride), Aromatic hydrocarbons (eg, benzene, toluene, xylene), amides (eg, dimethylformamide, dimethylacetamide, n-methylpyrrolidone), ethers (eg, diethyl ether, dioxane, tetrahydrofuran) Emissions), ether alcohols (e.g., 1-methoxy-2-propanol), esters (e.g., methyl acetate, ethyl acetate, butyl acetate, isopropyl acetate) and the like.

≪Print fixing layer≫
The print fixing layer of the present invention is formed from the above-mentioned composition for forming a print fixing layer. Here, first, the composition for forming a print fixing layer is applied to a substrate, and dried as necessary to form a print fixing layer.

  The printing fixing layer forming composition can be applied to gravure coating, gravure reverse coating, gravure offset coating, spinner coating, roll coating, reverse roll coating, kiss coating, wheeler coating, dip coating, solid coating by silk screen, wire bar Examples of the coating method include a coating method, a flow coating, a comma coating, a flow-through coating, a brush coating, and a spray coating.

(Coefficient of friction)
The print fixing layer of the present invention preferably has a static friction coefficient of 0.80 or less, 0.70 or less, 0.60 or less, 0.50 or less, or 0.40 or less. When the friction coefficient is low, the medium having the print fixing layer can be handled easily.

  For example, for a passbook, the print fixing layer has the static friction coefficient as described above, so that the difference in the friction coefficient between the print fixing layer and a passbook cover member other than the print fixing layer is reduced. Accordingly, the cover member is less likely to be caught due to the high friction coefficient of the print fixing layer, and it is considered that the occurrence of errors when sending the passbook is reduced in the automatic issuing machine and the automatic carry-over machine. Such an improvement in handleability due to a low coefficient of friction is considered to be beneficial in various media other than a passbook.

  Note that the print fixing layer that has been coated and dried may have a high coefficient of friction, and the coefficient of friction is lowered by rubbing as necessary. When the print fixing layer of the present invention is formed on a passbook, this rubbing may be achieved by rubbing the passbook, which naturally occurs in the passbook manufacturing process. In the passbook manufacturing process, there are printing process, collating process, cutting / back glue process, sewing machine process, folding process, magnetic tape application process, etc. The print fixing layer is rubbed and rubbed in each of these processes The coefficient is low.

The static friction coefficient can be measured in accordance with JIS P8147, and in particular, it can be measured using a friction measuring machine (Toyo Seiki Seisakusho, TR-2). Here, the horizontal movement speed at the time of measurement is 100 mm / min, and 200 g (40 cm ² ) can be used as the sliding piece (weight).

  FIG. 2 shows a schematic view of the measuring apparatus. Here, the present invention is applied to the entire surface of the cover (paper cloth) (1a and 1b) of two passbooks (10a and 10b) using a solid silk plate. The composition for forming a print fixing layer is applied. Print fixing layers (2a, 2b) obtained by drying after coating (at 35 ° C. for 15 minutes or longer) were obtained. In order to measure the coefficient of static friction by rubbing the two passbooks against each other, one passbook (10a) is fixed to the measurement unit (3), and the other passbook (10b) is fixed to the stand (6) fixed portion (4 ). Moreover, a 200-g weight (5) is put on these passbooks (10a and 10b), and the stand (6) is pulled horizontally at a speed of 100 mm / min. The measurement is performed 15 times, and the static friction coefficients of the 13th to 15th times are averaged. This is because the friction coefficient is not sufficiently lowered and the measured value may not be stabilized in the 10th to 12th rubbing after the formation of the print fixing layer.

(Print density and fixability)
When printing is performed on the print fixing layer of the present invention, the printed portion has a good print density. Here, with respect to the print fixing layer printed with a black solid portion having a sufficient print density, a spectrocolorimeter SpectroEye manufactured by Gretag Macbeth (light source: D ₅₀ , viewing angle: 2 °, density standard: DIN) , White standard: Abs, built-in filter: NO), when defined as an average optical density (OD value) measured at a plurality of points, the print density is preferably 0.70 or more, 0.75 or more 0.80 or more, 0.83 or more, or 0.85 or more.

  Further, the printed portion has a high print fixing property. When the print fixability is defined as the print density after rubbing 20 times with a plastic eraser immediately after printing, the print fixability is preferably 0.45 or more, 0.50 or more, 0.55 or more, It is 0.60 or more, or 0.65 or more.

≪Print media and passbook≫
The medium having the print fixing layer of the present invention is not particularly limited as long as it is preferable to promote printing by the print fixing layer. For example, a plastic card, an optical disk, a resin-coated paper, and a fiber Etc. Here, the print medium refers to a medium on which characters or the like can be printed or written.

  In order to improve the adhesion of the print fixing layer, another anchor layer may be formed between the print medium and the print fixing layer. Such layers include chlorine-containing polymers such as polyvinyl chloride, vinyl chloride-vinyl acetate copolymers, vinyl chloride-vinyl acetate-vinyl alcohol copolymers, vinyl chloride-vinyl acetate-maleic acid copolymers, Vinyl chloride-acrylate copolymer, polyvinylidene chloride, vinylidene chloride-vinyl chloride copolymer, vinylidene chloride-acrylonitrile copolymer, etc .; polyester resins such as polyethylene terephthalate resin, polybutylene terephthalate resin, terephthalic acid or isophthalic acid Condensed ester resin of acid component and alcohol component such as ethylene glycol or cyclohexanedimethanol (for example, PETG: trademark of Eastman Chemical Company), etc .; biodegradable plastic resin, polylactic acid resin, starch and modified polyvinyl alcohol Natural polymer resins composed of, etc., microbially produced resins composed of β-hydroxybutyric acid and β-hydroxyvaleric acid, polyamide resins; acrylic resins; silicone resins, etc. Alternatively, a laminate obtained by combining these materials may be used.

  A schematic view of a bankbook 10 having the print fixing layer 2 of the present invention is shown in FIG. A print fixing layer 2 is formed on a cover 1 which is a resin processed cloth cloth or a resin processed paper cloth. The print fixing layer 2 is printed with an account number, a name, and the like by an automatic issuing machine and an automatic carry-over machine.

  Each component described in any of Examples 1 to 8 and Comparative Example 1 described in Table 1 and cyclohexanone as a solvent were mixed to prepare a composition for forming a print fixing layer. These are applied to a base material (trade name: TS Best Cover, Tokushu Tokai Paper Co., Ltd.) using a 255 wire silk plate, dried at 35 ° C. for 30 minutes, and a print fixing layer having a thickness of about 7 μm. Got. In addition, the comparative example 4 respond | corresponds to the composition as described in Unexamined-Japanese-Patent No. 2010-131753 (patent document 3). Further, the static friction coefficient of the base material at the place where the print fixing layer was not formed was 0.32, and is shown in Table 1 as a reference.

  The print fixing layer thus obtained was evaluated for the coefficient of static friction, the print density, and the print fixability by the above methods. These results are also shown in Table 1. Note that three print fixing layers were prepared in each example, and the average value of the three is described in the evaluation results.

The details of each component contained in the composition for forming a print fixing layer are as follows:
Binder resin: PVC resin (manufactured by Seiko Advance Co., Ltd., SSPC (Z) Y1161 reducer, solid content 38% by weight)
Inorganic fine particles: Silica (manufactured by Tosoh Silica Co., Ltd., E-150J, average particle size 4.7 μm)
Fluorine resin fine particles: PTFE particles (manufactured by Kitamura, KTL8N)
Wax: Polyethylene wax (manufactured by San Nopco, trade name SL-551)

  The print fixing layer formed in the passbook using the composition for forming the print fixing layer of Example 2 and the print fixing layer of Comparative Example 2 in which the same amount of wax was added instead of the fluororesin fine particles (PTFE) of Example 2. The printing characteristics of the printing fixing layer formed on the passbook using the forming composition were compared and evaluated. The results are shown in Table 2.

1 cover of passbook 2 print fixing layer 3 measuring part 4 fixed part 5 weight 6 units 10 passbook

Claims (9)

  A composition for forming a print fixing layer, comprising a binder resin, inorganic fine particles, and 10 parts by weight or more of fluorine-based resin fine particles based on the weight of the binder resin.   The composition for forming a print fixing layer according to claim 1, wherein the wax is 10 parts by weight or less based on the weight of the binder resin.   The composition for forming a print fixing layer according to claim 1 or 2, wherein the fluororesin fine particles are 90 parts by weight or less based on the weight of the binder resin.   The fluororesin fine particles are selected from the group consisting of monofluoroethylene resin, difluoroethylene resin, trifluoroethylene resin, tetrafluoroethylene resin, tetrafluoroethylene / hexafluoropropylene copolymer resin, derivatives thereof, and mixtures thereof. The composition for forming a print fixing layer according to any one of claims 1 to 3, wherein the composition is a fine particle of a selected resin.   The binder resin according to any one of claims 1 to 4, wherein the binder resin is selected from the group consisting of polyester, polyacrylate, polyvinyl chloride, polyvinyl acetate, polyamide, polystyrene, and derivatives thereof, and mixtures thereof. The composition for print fixing layer formation of description.   The inorganic fine particles are selected from the group consisting of silica, talc, kaolin, clay, alumina white, calcium carbonate, magnesium carbonate, aluminum sulfate, barium sulfate, and mixtures thereof. The composition for forming a print fixing layer described in 1.   A print fixing layer formed by the composition for forming a print fixing layer according to claim 1.   A print medium comprising the print fixing layer according to claim 7.   A bankbook comprising the print fixing layer according to claim 7.

Images