JP5521673B2 - Coated paper for crimping sheets - Google Patents

Description

The present invention relates to a coated paper for a pressure-bonding sheet, and more specifically, a coated paper having a coating layer having an offset printing suitability and a recording suitability by a high-speed ink jet printer, wherein the coating is performed by offset printing and recording by an ink jet printer. A coated sheet for pressure-sensitive adhesive sheets used for post-glue-type pressure-sensitive adhesive sheets, which is formed by applying a pressure-sensitive varnish on the work layer to form an adhesive layer and then bending the adhesive layer so that the faces of the adhesive layer face each other. It is.

As a method for producing a pressure-bonding sheet, a method is known in which an adhesive layer is provided by a front-paste method or a post-paste method, or a laminate for pressure-bonding is performed on a printing surface. The pre-glue method is a method in which a pressure-sensitive adhesive sheet having an adhesive layer on the surface of a paper substrate is printed and then subjected to a pressure-bonding process to form a pressure-sensitive adhesive sheet. Before printing, the adhesive layer (glue) Is applied to the surface of the coated paper, so it is called “tip glue”. The pressure-bonding sheet produced by the tip paste method is mainly used in combination with a porous pigment such as silica and a natural rubber-based adhesive as an adhesive layer, and the printed surface after peeling is a mat.

The post-glue method is called “post-glue” because it is a method in which an adhesive layer is applied to the coated paper and then subjected to a pressure-bonding process to form a pressure-bonded sheet. Clear varnish is used for the adhesive sheet made by the post-glue method, and the printed surface after peeling reflects the surface properties of the coated paper and can be selected from mat to gloss. In addition, the amount of use has increased in recent years because it is cheaper than providing a laminate.

As a method for printing on coated paper, offset printing is widely used. Since offset printing is capable of high-speed and large-scale full-color printing, it is used for various printed materials and has become the mainstream of printed material manufacturing methods. On the other hand, as the speed and image quality of inkjet systems have been increasing in recent years, address information for postal items used for direct marketing can be recorded by additionally recording variable information on printed materials produced by conventional printing methods. The use of so-called hybrid printing, in which variable data such as coupons, lucky numbers, barcodes, QR codes, etc. are additionally printed by inkjet printers on printed matter pre-printed with fixed data by full-color offset printing, has attracted attention. .

As a result, the use of the pressure-sensitive adhesive sheet as a post-adhesive pressure-sensitive adhesive sheet is increased after the hybrid printing is performed and the pressure-sensitive adhesive is applied by the post-adhesive method and then the pressure-bonding process is performed. Yes.

Currently, the coated paper used in the preparation of such a post-glue type pressure-sensitive adhesive sheet is usually in the field of commercial printing (offset printing) as described in JP-A-7-189179 (Patent Document 1). It has been common to use what has been used. The coated paper is usually produced by applying a coating layer coating containing pigment, binder, etc. at least 10 g / m ² per side of the base paper using various coaters, and then smoothing the surface by calendering. Has been. These general coated papers are mainly used for offset printing, and these coated papers for offset printing have problems such as picking, in which weak spots on the surface of the paper are pulled out due to the adhesiveness of the ink, and printing is lost in a dotted pattern. The coating layer does not cause problems such as blistering, where the water in the paper substrate expands as water vapor when heated to dry the ink, and the printed surface is broken like a blister The coating is strongly designed.

On the other hand, there are problems such as poor adhesive stability of the post-glue method, the desired adhesive strength cannot be obtained, and the postcard base material breaks without peeling from the peeling surface, or the inkjet Since the ink absorption required for recording is inferior, it can be used for hybrid printing by offset printing and ink jet recording method, and after applying pressure-sensitive adhesive by post-glue method, press-bonding treatment is sufficient and stable A post-glue type pressure-sensitive adhesive sheet paper that retains a good adhesive force has not been obtained.

In order to obtain good suitability in both offset printing and inkjet recording methods, for example, a method of providing a pigment coating layer mainly composed of silica as disclosed in JP-A-2002-127578 (Patent Document 2). However, although such a coating layer has good ink jet recording suitability, the strength of the coating layer is not always sufficient, and it is unavoidable that a problem of picking may occur in offset printing. It was not satisfactory.

Japanese Patent Application Laid-Open No. 2004-84141 (Patent Document 3) discloses that in a coated paper for printing in which a coating layer mainly composed of a pigment and a latex binder is provided on a base paper, the base paper has a molecular weight of 20000 or less. Alkylamine / epihalohydrin polycondensate and / or alkylamine / ammonia / epihalohydrin polycondensate is adhered to 1.0 to 2.0 g / m ² per both sides, and light calcium carbonate is used as a pigment to form the coating layer. More than 30% by mass, and the ink transfer amount is 9.0 ml / m ² or more when the absorption time is 0.7 seconds according to the Bristow method (J.TAPPI No. 51-87, liquid absorption test method for paper and paperboard). By using coated paper for printing, which is characterized by being suitable for the offset printing method and the high-speed inkjet recording method of the rotary method It has been proposed to balance aptitude. However, it has not always been satisfactory to maintain a sufficient and stable adhesive force as a post-paste type pressure-sensitive adhesive sheet paper, in which a pressure-sensitive adhesive is applied after the post-paste type is applied.

On the other hand, in Japanese Patent Application Laid-Open No. 2005-36379 (Patent Document 4), in a coated paper in which a paper-like base material and at least two coating layers are provided on at least one surface thereof, the paper-like base is provided. The inner coating layer adjacent to the material contains a pigment having a crystal structure of any one of acicular crystals, spindle-shaped crystals, columnar crystals, and rice granular crystals, and is formed on the inner coating layer. In addition, a coated paper characterized in that the outermost coated layer contains thermoplastic organic fine particles having a glass transition temperature of 20 to 150 ° C. has been proposed. This is a coated paper that generates cracks on the surface of the recording paper, increases the air permeability of the coating layer, and prevents the occurrence of blisters during offset printing. In addition to having good performance, the image recording paper can be used for thermal transfer system, ink jet system and the like. However, since there are a large number of cracks on the surface of the paper, the ink spreads along the cracks in the inkjet ink having a very low viscosity as compared with the ink for offset printing and the heat-fused electrophotographic toner. There is a problem that a so-called feathering phenomenon, in which ink bleeds like a feather easily occurs. In this way, surface strength capable of offset printing, high ink absorption performance, ink jet recording suitability, and sufficient and stable adhesive strength even after pressure-sensitive adhesive is applied and then pressure-bonded. At present, no coated paper suitable for a post-bonding type pressure-sensitive sheet can be obtained.

JP 7-189179 A JP 2002-127578 A JP 2004-84141 A JP 2005-36379 A

An object of the present invention is a post-glue type pressure-sensitive adhesive sheet that has excellent offset printing suitability, has high-speed inkjet printer recording suitability, and retains sufficient and stable adhesive force when a crimping varnish is applied and crimped. Coating paper is provided.

The present invention includes the following modes.

[1] After printing on coated paper, an adhesive layer area is provided on at least one surface of the paper, and the adhesive layers can be bonded by high pressure treatment so that they face each other. In the pressure-sensitive adhesive sheet coated paper used as a pressure-sensitive adhesive sheet in the post-glue pressure bonding method, the pressure-sensitive adhesive sheet coated paper has at least one layer of a base paper and two or more layers mainly composed of a pigment and a binder. The outermost coating layer contains calcium carbonate having an average particle diameter of 1.5 to 2.5 μm as a pigment and styrene / butadiene copolymer latex as a binder. The ratio of styrene / butadiene copolymer latex per 100 parts by mass of the coating layer is 5 to 30 parts by mass, and an inner coating layer is provided between the substrate and the outermost coating layer, Inner coating layer is average grain Calcium carbonate particles of size 3.0 to 4.0 .mu.m, containing styrene-butadiene copolymer latex as a binder, the inner coating layer 100 mass parts per styrene-butadiene copolymer ratio scheme latex 1 to 10 A coated paper for a pressure-bonding sheet, characterized by being a mass part.

[2] The coated paper for pressure-bonding sheets according to [1], wherein the calcium carbonate is heavy calcium carbonate.
[3] The pressure-sensitive adhesive sheet according to either [1] or [2], wherein the density of the coated paper according to JIS-P8118: 1998 is 0.90 to 1.15 g / cm ³ . Coated paper.
[4] The coated paper for pressure-bonding sheets according to any one of [1] to [3],
[5] The pressure-sensitive adhesive sheet coated paper is a pressure-sensitive adhesive sheet coated paper used as a pressure-sensitive adhesive sheet using a UV curable pressure bonding varnish. The coated paper for pressure-bonding sheets according to any one of the above.

The present invention is a pressure-sensitive adhesive sheet coated paper excellent in offset printing suitability and suitable for hybrid printing with high-speed inkjet printer recording suitability, which is sufficiently and stable when applied with a crimping varnish and subjected to a crimping treatment. This is a coated paper for a pressure-sensitive adhesive sheet, which is used for a pressure-sensitive adhesive sheet of a post-glue method that retains adhesive strength, and has a suitable matte surface.

The pressure-sensitive adhesive sheet coated paper of the present invention has an inner coated layer and an outermost coated layer made of a calcium carbonate particle pigment having a specific average particle diameter on one or both sides of the base paper. The outermost coating layer and the inner coating layer have sufficient dry pick strength and wet pick strength by containing calcium carbonate particles and a styrene / butadiene copolymer latex in a specific ratio, and are good. It is a coating layer having a suitable offset printability. Furthermore, since the calcium carbonate particles of the outermost coating layer are in the range of 1.5 to 2.5 μm, the surface of the coating layer is not disturbed by preventing the ink jet ink driven by hybrid printing from being absorbed into the coating layer. The penetration of the coated crimping varnish into the coating layer is effectively suppressed, and sufficient adhesive force can be obtained by performing the crimping process with the adhesive layers facing each other, resulting in inkjet recording. It is considered that the sheet has excellent suitability as a pressure-bonding sheet paper on which hybrid printing using the method is performed. In particular, if the surface on which the outermost coating layer is provided is a matte surface, there is a possibility that sufficient adhesive force may not be obtained when a pressure-bonding process is performed by a post-glue method, but the outermost coating layer of the present invention. The coated paper for the pressure-bonding sheet provided with has good suitability for pressure-bonding treatment even on the matte surface. In the coated paper for pressure-bonding sheets of the present invention, an inner coating layer having calcium carbonate particles in the range of 3.0 to 4.0 μm is further provided below the outermost coating layer. Thus, the ink jet ink that has penetrated the outermost coating layer can quickly penetrate the voids in the inner coating layer, and has extremely excellent ink jet recording suitability.
The coated paper for pressure-bonding sheets of the present invention has a structure in which the inner coating layer and the outermost coating layer are combined as described above, so that the ink-jet ink has excellent absorbability and a pressure-bonding varnish adhesive layer. It is possible to achieve both compatibility as a pressure-bonding sheet paper that can be formed.

Crimping coated paper sheet of the present invention, after printing, the realm of the adhesive layer on at least one surface of the surface provided, can adhere by strong pressure processed as the adhesive layer are opposed to each other, after bonding A pressure-sensitive adhesive sheet coated paper used as a pressure-bonding sheet in a post-glue pressure-bonding method that can be peeled between adhesive layers, and the coated paper is mainly composed of a pigment and a binder on at least one surface of the base paper. Two or more coating layers are provided, and the outermost coating layer contains calcium carbonate particles having an average particle diameter of 1.5 to 2.5 μm as a pigment and styrene / butadiene copolymer latex as a binder. The ratio of the styrene / butadiene copolymer latex per 100 parts by mass of the outermost coating layer is 5 to 30 parts by mass, and an inner coating layer is provided between the substrate and the outermost coating layer. Having the inner coating layer Average particle size 3.0 to calcium carbonate particles of 4.0 .mu.m, containing styrene-butadiene copolymer latex as a binder, the ratio of the coating coating layer per 100 mass parts of styrene-butadiene copolymer latex 1 It is characterized by 10 parts by mass.

In the post-glue type pressure-sensitive adhesive sheet coated paper that has excellent offset printing suitability and high-speed inkjet printer recording suitability, and is applied with a crimping varnish and is subjected to a crimping process, the inventors have shared the functions on the base paper. By providing two or more coating layers mainly composed of a pigment and a binder, a coated sheet for a pressure-bonding sheet having a suitable matte surface with sufficient and stable adhesion can be obtained. I found what I can do.

[Base paper]
For the types of pulp constituting the base paper of the present invention, chemical pulp such as KP, mechanical pulp such as SGP, RGP, BCTMP or CTMP, waste paper pulp such as deinked pulp, or kenaf, bamboo, straw, hemp, etc. Such non-wood pulp may be used. In addition, organic synthetic fibers such as polyamide fibers and polyester fibers, recycled fibers, polynosic fibers, glass fibers, ceramic fibers, carbon fibers and other inorganic fibers can be used in combination, and the production method is within the range not impairing the effects of the present invention. The type is not particularly limited. As the pulp used for the base paper, it is preferable to use chlorine-free pulp such as ECF pulp or TCF pulp from the viewpoint of environmental considerations.

The pulp used for the base paper is beaten for the purpose of promoting the entanglement of the fibers and improving the bond strength inside the paper layer. The degree of beating of the pulp can be adjusted by the beating degree (canada standard freeness; csf). In the base paper of the present invention, the preferred beating degree is not particularly limited, but 300 to Adjust in the range of 550 ml (csf). If the beating process has not progressed and the beating degree exceeds 550 ml (csf), the entanglement and adhesion at the third position are insufficient, and sufficient internal bond strength cannot be obtained, There is a risk of causing a problem that blisters occur during offset printing. On the other hand, when the beating degree is less than 300 ml (csf), although the adhesive force due to the entanglement of the fibers is saturated, the strength of the single fibers is lowered, and the printing strength may be lowered. A more preferable range of beating degree is 350 to 520 ml (csf).

Moreover, a filler can be mix | blended with a base paper as needed. As the filler, various pigments generally used for fine paper can be used, and are not necessarily limited, but kaolin, calcined kaolin, calcium carbonate, calcium sulfate, barium sulfate, titanium dioxide, talc, zinc oxide, alumina , Smectite clay minerals such as magnesium carbonate, magnesium oxide, silica, white carbon, bentonite, mineral pigments such as zeolite and sericite, or polystyrene resin, urea resin, melamine resin, acrylic resin vinylidene chloride Examples thereof include organic pigments such as hollow fine particles such as resin, solid particles, and through-hole particles.

In the paper making of the base paper, various anionic, nonionic, cationic or amphoteric retention improvers and drainage improvers that are conventionally used in the stock within the range that does not impair the effects of the present invention. Auxiliaries, dry paper strength enhancers, wet paper strength enhancers, binders, coloring agents such as dyes, fluorescent whitening agents, pH adjusters, antifoaming agents, pitch control agents, slime control agents, and other papermaking aids Can be appropriately added and used. Examples of the dry paper strength enhancer include an anionic, cationic or amphoteric polyacrylamide resin. Examples of the wet paper strength enhancer include polyamide resin, melamine-formaldehyde resin, urea-form. Examples include aldehyde resins, polyamide / polyamine / epichlorohydrin resins, and polyethyleneimine resins. Examples of the binder include water-soluble polymer compounds such as starch and various modified starches, polyvinyl alcohol resins, and cellulose derivatives such as carboxymethyl cellulose.

The sizing degree of the base paper used in the present invention is not particularly limited, but the Steecht sizing degree is preferably 100 seconds or less. The sizing degree of the base paper can be adjusted by using an internal sizing agent added to the raw material of the base paper, a surface sizing agent in the surface treatment with a size press or the like, or appropriately combining these. As the internal sizing agent, rosin-based sizing agents such as rosin soap, petroleum resin-based sizing agents and other synthetic sizing agents, alkyl ketene dimers, alkenyl succinic anhydride, etc. are adapted to paper making methods such as acidic paper making and neutral paper making. It is appropriately used together with a fixing agent such as a sulfuric acid band and cationized starch. The surface sizing agent is not necessarily limited, but in addition to the materials used as the internal sizing agent, styrene / maleic acid copolymer, styrene / acrylic acid (ester) copolymer, Examples thereof include styrene / methacrylic acid (ester) copolymers.

The paper making method of the base paper of the present invention is not particularly limited, and the acid paper making method performed in the vicinity of 4.5 as the paper making pH, or in the weakly acidic to weakly alkaline region where the paper making pH is about 6 to 9, The neutral papermaking method etc. which can use alkaline fillers, such as these, can be used suitably. As the equipment used for papermaking, a long net paper machine, a twin wire type paper machine, a round net paper machine, or a known means can be used as appropriate, and it is dried by a multi-cylinder dryer and finished, or a single gloss by a Yankee dryer. It can also be used as a base paper as paper.

[Inner coating layer]
The pressure-sensitive adhesive sheet coated paper of the present invention contains calcium carbonate particles having an average particle diameter of 1.5 to 2.5 μm as a pigment, and a styrene / butadiene copolymer latex as a binder, under the outermost coated layer. calcium carbonate particles having an average particle diameter of 3.0 to 4.0 .mu.m, containing styrene-butadiene copolymer latex as a binder, the ratio of the coating coating layer per 100 mass parts of styrene-butadiene copolymer latex 1 The inner coating layer is 10 parts by mass.
With this configuration, the pressure-sensitive adhesive sheet coated paper of the present invention has a sufficient inter-pigment particle gap in the lower inner coating layer, and has a high ink solvent absorption rate in inkjet recording, and is sufficient in offset printing. Surface strength can be obtained.

As the calcium carbonate used for the inner coating layer of the present invention, heavy calcium carbonate, light calcium carbonate, and aggregated calcium carbonate can be used.
Light calcium carbonate is synthesized by a carbon dioxide reaction method or a soluble salt reaction method, and is also called precipitated calcium carbonate. Depending on the conditions during synthesis, trigonal calcite, orthorhombic aragonite, hexagonal vaterite are obtained, calcite is cubic to spindle-shaped particles, aragonite is columnar to needle-shaped particles, Vaterite is obtained in the form of spherical particles. Agglomerated calcium carbonate is obtained by adjusting the growth process of single crystals and the aggregation process of fine single crystals under the production conditions of light calcium carbonate, and rosette-like particles formed by agglomerating spindle-shaped and columnar primary particles Things are known. On the other hand, heavy calcium carbonate can be obtained by wet or dry pulverization of calcium carbonate minerals such as limestone and marble, weathered shells, etc., which are naturally produced, and classified appropriately. Usually, heavy calcium carbonate is the most stable calcite at normal temperature, and the shape of its single particles is usually irregular particles by grinding.

As the calcium carbonate used for the inner coating layer of the present invention, any of heavy calcium carbonate, light calcium carbonate, and agglomerated calcium carbonate can be used.In particular, heavy calcium carbonate is inexpensive, Even with a small amount of binder, a coating layer with high surface strength can be obtained. As a result, the amount of binder used can be kept low and the gaps between the calcium carbonate pigment particles can be prevented from being blocked. Since a coating layer with improved properties can be obtained, it can be preferably used.

If the average particle size of the calcium carbonate pigment used for the inner coating layer is less than 3.0 μm, the solvent absorbability of the inkjet ink is insufficient. When an adhesive layer is provided and a pressure-bonding process is performed to obtain a pressure-sensitive adhesive sheet of a post-glue method, sufficient adhesive force cannot be obtained. The average particle diameter of the calcium carbonate pigment used for the inner coating layer of the present invention is in the range of 3.0 to 4.0 μm.

The average particle diameter of the pigment particles is a weight average particle diameter obtained from a weight-based particle diameter distribution of the pigment particles dispersed in the dispersion as primary particles or secondary particles. The weight average particle diameter can be determined from, for example, a particle diameter distribution measured using a laser diffraction / scattering particle diameter distribution measuring apparatus (trade name: Microtrack 3300EXII, manufactured by Nikkiso Co., Ltd.).

The calcium carbonate used for the inner coating layer is preferably contained in an amount of 30 to 90 parts by mass, more preferably 40 to 80 parts by mass in 100 parts by mass of the coating layer. If the content of calcium carbonate is less than 30 parts by mass, it is difficult to obtain sufficient solvent absorbability of the inkjet ink, and if the content of calcium carbonate exceeds 90 parts by mass, sufficient surface strength may not be obtained. May cause picking problems during offset printing.

As the pigment for the inner coating layer, various known pigments can be used in combination with the above-mentioned calcium carbonate pigment as long as the effects of the present invention are not impaired. Such a pigment is not particularly limited, but kaolin such as calcined kaolin, structural kaolin, delaminated kaolin and modified products thereof, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, alumina, Amorphous silica such as magnesium carbonate, particulate magnesium carbonate, magnesium oxide, white carbon, colloidal silica, magnesium aluminosilicate, particulate calcium silicate, satin white, bentonite and other smectite clay minerals, zeolite, sericite and other mineral materials Various organic pigments such as various inorganic pigments, polystyrene resins, urea resins, melamine resins, acrylic resins, vinylidene chloride resins, benzoguanamine resins and other hollow microparticles, solid particles, and through-hole microparticles It is possible.

A styrene / butadiene copolymer latex is used as the binder of the inner coating layer of the present invention. Styrene / butadiene copolymer latex improves the wet pick strength of the coating layer and has excellent suitability as a binder for coated paper for offset printing.
The ratio of styrene / butadiene copolymer latex per 100 parts by mass of the inner coating layer is 1 to 10 parts by mass. If it exceeds 10 parts by mass, the solvent absorbability of the ink-jet ink is lowered and sufficient absorption cannot be obtained. If it is less than 1 part by mass, sufficient surface strength cannot be obtained, and there is a problem of picking during offset printing. May occur.

The binder in the inner coating layer is not necessarily limited. For example, starches, hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose, gelatin, casein, gum arabic, diisobutylene / maleic anhydride copolymer salt , Styrene / maleic anhydride copolymer salt, ethylene acrylic acid copolymer salt, styrene / acrylic acid copolymer salt, urea resin, melamine resin, amide resin, acrylic resin latex, polyurethane latex, styrene, acrylic acid , Methacrylic acid, acrylic acid ester, methacrylic acid ester, acrylamide, methacrylic acid methyl vinyl ether and other vinyl polymers or copolymers, synthetic rubber latex such as methyl methacrylate / butadiene resin, polyurethane resin Polyester resins, polyamide resins, and olefin-maleic anhydride resins described above, can be used together to styrene-butadiene copolymer latex. Water-soluble polymer compounds, particularly various starches, are preferably used because they can be expected to improve the coating suitability as a binder to be used in combination with the styrene / butadiene copolymer latex and are relatively inexpensive materials.

In the inner coating layer, surfactants, pH adjusters, viscosity modifiers, softeners, gloss-imparting agents, waxes, dispersants, flow modifiers, stabilization, as long as the effects of the present invention are not impaired. Contains various auxiliaries such as additives, antistatic agents, crosslinking agents, sizing agents, fluorescent brighteners, colorants, UV absorbers, antifoaming agents, water-proofing agents, plasticizers, lubricants, preservatives, and fragrances. I can do it.

The coating amount of the inner coating layer of the present invention is preferably 6 to 30 g / m ² as the dry coating amount. When the coating amount is less than 6 g / m ² , when the inner coating layer is provided directly on the base paper, the unevenness on the surface of the base paper cannot be sufficiently filled. The gloss of the surface coated with the pressure bonding varnish may be lowered. On the other hand, if the coating amount exceeds 30 g / m ² , drying during coating of the inner coating layer is difficult, leading to a decrease in operability and a decrease in productivity. A more preferable coating amount range is 8 to 15 g / m ² .

[Outermost coating layer]
The coated paper for pressure-bonded sheets of the present invention contains calcium carbonate particles having an average particle diameter of 3.0 to 4.0 μm as a pigment, and styrene / butadiene copolymer latex as a binder, on the inner coating layer, Calcium carbonate particles having an average particle size of 1.5 to 2.5 μm as a pigment, styrene / butadiene copolymer latex as a binder, and a ratio of styrene / butadiene copolymer latex per 100 parts by mass of the coating layer is 5 to The outermost coating layer is 30 parts by mass.
With this configuration, the coated paper for pressure-bonding sheets of the present invention has sufficient inter-pigment particle interstices in the outermost coating layer, and has high ink absorbability in inkjet recording, and a pressure-varying varnish by a post-glue method. Adhesive strength can be obtained when a post-glue-type pressure-sensitive adhesive sheet paper is formed after the adhesive layer is provided.

In the outermost coating layer of the present invention, heavy calcium carbonate, light calcium carbonate, and agglomerated calcium carbonate can be used. In particular, heavy calcium carbonate has a high coating amount even in a small amount of binder. The surface strength of the layer is obtained. For this reason, it is considered that the amount of the binder to be used can be suppressed as a result, and the gap between the calcium carbonate pigment particles can be hardly blocked, and the ink-jet ink absorbability can be improved, which is preferably used. The average particle diameter of the calcium carbonate pigment particles used for the outermost coating layer is 1.5 to 2.5 μm. If it is 1.5 μm or less, the solvent absorbability of the ink-jet ink is insufficient, and if it is 2.5 μm or more, the pressure-bonding varnish sinks into the coating layer. Is not formed, and a pressure-sensitive adhesive varnish is applied by a post-glue method, and then a pressure-bonding process is performed to obtain a pressure-sensitive adhesive sheet paper. The average particle diameter of the pigment particles is a weight average particle diameter obtained from a weight-based particle diameter distribution of the pigment particles dispersed in the dispersion as primary particles or secondary particles.

The calcium carbonate used in the outermost coating layer is preferably contained in 30 to 90 parts by mass in 100 parts by mass of the pigment in the coating layer. If the calcium carbonate content is less than 30 parts by mass, sufficient ink-jet ink absorbability will be difficult to obtain, and if the calcium carbonate content exceeds 90 parts by mass, sufficient surface strength may not be obtained. In some cases, picking problems may occur during offset printing.

In the outermost coating layer, pigments other than calcium carbonate can be used in combination as long as the effects of the present invention are not impaired. The pigment that can be used in combination can be appropriately selected from those exemplified above as pigments that can be used in combination with calcium carbonate in the inner coating layer.

The outermost coating layer contains 5 to 30 parts by mass of styrene / butadiene copolymer latex as a binder per 100 parts by mass of the coating layer. Styrene / butadiene copolymer latex improves the wet pick strength of the coating layer and has excellent suitability as a binder for coated paper for offset printing. If the content of the styrene / butadiene copolymer latex is less than 5 parts by mass, sufficient surface strength cannot be obtained, and a problem of picking may occur during offset printing. Moreover, when it exceeds 30 mass parts, the absorptivity of an inkjet ink will fall.

Although not necessarily limited, in the outermost coating layer, a styrene / butadiene copolymer is appropriately selected from those exemplified as the binder that can be used in combination with the inner coating layer. Can also be used in combination with latex. Water-soluble polymer compounds, particularly various starches, are preferably used because they can be expected to improve the coating suitability as a binder to be used in combination with the styrene / butadiene copolymer latex and are relatively inexpensive materials.

In the outermost coating layer, the surfactant, pH adjuster, viscosity modifier, softener, gloss imparting agent, waxes, dispersant, flow modifier, as long as the effect of the present invention is not impaired. Contains various auxiliaries such as stabilizers, antistatic agents, cross-linking agents, sizing agents, fluorescent brighteners, colorants, UV absorbers, antifoaming agents, water-resistant agents, plasticizers, lubricants, preservatives, and perfumes. I can do it.

The coating amount of the outermost coating layer of the present invention is preferably 6 to 30 g / m ² as the dry coating amount. If the coating amount is less than 6 g / m ² , sufficient coating cannot be performed and uniform surface properties may not be obtained. On the other hand, if the coating amount exceeds 30 g / m ² , drying during coating of the inner coating layer is difficult, leading to a decrease in operability and a decrease in productivity. A more preferable coating amount range is 6 to 12 g / m ² .

As the method for providing each coating layer, various known coating methods can be used, but are not necessarily limited, blade coater, air knife coater, roll coater, reverse roll coater, bar coater, curtain coater, A slot die coater, a gravure coater, a Chanplex coater, a brush coater, a two-roll type or metering blade type size press, a bill blade coater, a short dwell coater, a gate roll coater and the like can be used as appropriate. The blade coater that can apply high-concentration paints at high speed can be expected to reduce the effect that the binder component in the paint penetrates into the base paper. Since it can be set as the coating layer excellent in inkjet ink absorptivity and surface strength, and also it is easy to obtain the favorable coating layer surface excellent in surface property, it is used preferably.

The coated paper for pressure-bonding sheets of the present invention is subjected to a smoothing treatment after providing the inner coating layer and the outermost coating layer. As a smoothing method, various known smoothing methods such as a super calendar, a gloss calendar, and a soft calendar can be adopted, and can be appropriately performed on-machine or off-machine.
The smoothing conditions can be appropriately adjusted depending on the pressure device used, the number of pressure nips, the processing temperature, and the like. When the coated paper surface for the pressure-bonding sheet provided with the outermost coating layer is a mat surface, there is a possibility that sufficient adhesive force is difficult to be obtained when the pressure-bonding process is performed by the post-glue method. The coated paper has a mat surface with a glossiness of 30% or less, even if the 75 ° glossiness is 50% or less according to JIS-P8142: 2005 of the smoothed surface. Even in the case of paper, a sufficient and stable adhesive force can be obtained when an adhesive layer is provided on the paper so that the adhesive layers are opposed to each other and a pressure bonding process is performed.

Moreover, the preferable paper density as the coated paper for pressure-bonding sheets subjected to the smoothing treatment is 0.95 to 1.15 g / cm ³ . If the paper density is less than 0.95 g / cm ³ , the coated layer may not have sufficient surface strength. The surface strength is insufficient, and there is a risk that offset printing suitability such as dry pick strength and wet pick strength may not be obtained. On the other hand, if it exceeds 1.15 g / cm ³ , there is a risk that the ink jet ink absorption capacity will be insufficient. .

The pressure-sensitive adhesive sheet coated paper of the present invention is a pressure-sensitive adhesive sheet coating that retains a sufficient and stable adhesive force when it is subjected to a hybrid printing and then a pressure-sensitive adhesive varnish is applied by a post-glue method. As for the method of performing hybrid printing, for example, it is possible to record and print variable information with an inkjet printer after printing fixed information with normal offset printing, or to record and print variable information with an inkjet printer first. After that, offset printing can be performed. Also, offset printing and inkjet print recording can each be performed in a series of online or separately offline. In the offset printing or ink jet recording, the form of the paper may be flat or wound.

The pressure-sensitive adhesive sheet coated paper subjected to the hybrid printing is subjected to a pressure-bonding process by applying a pressure-sensitive varnish by a post-glue method.
For the pressure-sensitive adhesive sheet coated paper, a method of laminating the pressure-bonding process on the printing surface or surface treatment with a UV curable pressure-bonding varnish is used. A UV curable pressure bonding varnish is preferably used. UV-cured crimping varnish is less expensive than laminates, has the advantage that it cures quickly, requires no heat for drying, and can be processed in a short time. It is preferably used as an agent layer. The application method of the varnish is not necessarily limited. For example, the varnish is applied onto the printing surface using a coating means such as flexo or offset, and cured by UV irradiation to form an adhesive layer of the pressure varnish. The The coated paper for pressure-bonded sheets of the present invention has excellent hybrid printability, and even if it has a matte appearance, the UV-curable pressure-bonding varnish does not sink into the coating layer, Since a sufficient pressure-bonding varnish adhesive layer is formed, after applying the pressure-bonding varnish by a post-glue method, a pressure-bonding process is performed to obtain a stable and sufficient adhesive force when a pressure-bonded sheet is obtained. Various pressure-bonding sheets such as V-folding (two-folding) and Z-folding (three-folding) can be created by appropriately setting the application surface of the pressing varnish.

Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited thereto. In the examples, “parts” and “%” are parts by mass and mass% unless otherwise specified.

Example 1
[Manufacture of base paper]
An alkenyl as an internal sizing agent was added to a pulp slurry in which 90 parts by mass of hardwood bleached kraft pulp (LBKP, freeness 450 mlc.s.f.) and 10 parts by weight of softwood bleached kraft pulp (NBKP, freeness 450 mlc.s.f.) were dispersed. 0.05 part by mass of succinic anhydride (trade name: Fibran 81, manufactured by NSC Japan), polyacrylamide resin (trade name: PS194-7, manufactured by Arakawa Chemical Co., Ltd.) as a paper strength enhancer 2 parts by mass and 0.6 part by mass of a sulfuric acid band were added, and these mixtures were diluted with white water to prepare a paper stock having a pH of 5.3 and a solid content concentration of 1.1%. This stock is subjected to a papermaking machine to make a paper, and the obtained wet paper has 0.2 parts of a styrene / maleic acid copolymer (trade name: Polymeralon 385, manufactured by Arakawa Chemical Industries, Ltd.), oxidized starch. A size press solution containing 5.5% of the product name (trade name: Ace A, manufactured by Oji Cornstarch Co., Ltd.) is applied with a size press device so that the applied amount is 2 g / m ² by dry mass, and dried. Further, a smoothing process was performed using a machine calendar so that the smoothness was 30 seconds (described in J.TAPPI-5), and a base paper having a basis weight of 88 g / m ² was produced.

(Formation of inner coating layer)
The following coating liquid A was applied to both sides of the base paper using a blade coater so that the dry coating amount per side was 10 g / m ² to form an inner coating layer.
[Preparation of coating liquid A]
Oxidized starch dissolved in a 20% aqueous solution in 85 parts by weight of heavy calcium carbonate (converted to the solid content in the coating layer) prepared as a 70% dispersion by a wet pulverization method (trade name: Ace A, manufactured by Oji Cornstarch Co., Ltd.) 20 parts by mass (in terms of solid content in the coating layer) and 50% latex styrene-butadiene copolymer resin (trade name: T-2531H, manufactured by JSR Corporation) 5 A mass part (in terms of solid content in the coating layer) was added and stirred, and water was added to prepare a coating liquid A having a solid content concentration of 60%.

[Formation of outermost coating layer]
The following coating liquid a is applied onto the inner coating layer formed on both sides of the base paper using a blade coater so that the dry coating amount per side is 10 g / m ^2. A front coating layer was formed. The surface was smoothed using a super calender under the conditions of a paper passing speed of 750 m / min and a linear pressure of 350 g / cm (a nip number of 2), a basis weight of 128 g / m ² , and a density of 1.02 g / cm ^3. The coated paper for pressure bonding sheets was obtained.
[Preparation of coating solution a]
Oxidized starch dissolved in a 20% aqueous solution in 70 mass parts of heavy calcium carbonate (converted to the solid content in the coating layer) prepared as a 70% dispersion by a wet pulverization method (trade name: Ace A, manufactured by Oji Cornstarch Co., Ltd.) 10 parts by mass (in terms of solid content in the coating layer) and styrene / butadiene copolymer resin (trade name: T-2531H, manufactured by JSR Corporation) 20% latex A mass part (in terms of solid content in the coating layer) was added and stirred, and water was added to prepare a coating liquid a having a solid content concentration of 60%.

(Example 2)
In Example 1, the basis weight is the same as in Example 1 except that the following coating liquid B is used instead of the coating liquid A, and the following coating liquid b is used instead of the coating liquid a. A coated paper for a pressure-bonding sheet having a density of 128 g / m ² and a density of 1.01 g / cm ³ was obtained.
[Preparation of coating solution B]
Instead of heavy calcium carbonate prepared to have an average particle size of 3.5 μm of coating liquid A, commercially available heavy calcium carbonate (trade name: BF100, average particle size of 3.6 μm, manufactured by Bihoku Flour Industry Co., Ltd.) A coating liquid B was prepared in the same manner as the coating liquid A except that was used.
[Preparation of coating solution b]
Instead of heavy calcium carbonate prepared with an average particle size of 2.0 μm of coating liquid A, commercially available heavy calcium carbonate (trade name: Softon 1000, average particle size of 2.2 μm, manufactured by Bihoku Flourishing Co., Ltd. The coating liquid b was prepared in the same manner as the coating liquid B, except that the above was used.

(Example 3)
In Example 1, the following coating liquid C was used instead of the coating liquid A, and the following coating liquid c was used in place of the coating liquid a. A coated paper for a pressure-bonding sheet having an amount of 128 g / m ² and a density of 1.00 g / cm ³ was obtained.
[Preparation of coating liquid C]
Instead of heavy calcium carbonate prepared to have an average particle size of 3.5 μm in coating solution A, light calcium carbonate prepared to have an average particle size of 3.5 μm was used in the same manner as coating solution A. A coating liquid C was prepared.
[Preparation of coating liquid c]
Instead of heavy calcium carbonate prepared to have an average particle diameter of 2.0 μm, the light calcium carbonate prepared to have an average particle diameter of 2.0 μm was used in the same manner as coating liquid a. A coating liquid c was prepared.

Example 4
In Example 1, in place of the coating liquid a, the following coating liquid d was used, except that a coating weight d was used, as in Example 1, with a basis weight of 128 g / m ² and a density of 1.02 g / cm ³ . Coated paper was obtained.
[Preparation of coating solution F]
Instead of heavy calcium carbonate prepared to have an average particle diameter of 2.0 μm in coating liquid d, the same procedure as in coating liquid a was used except that heavy calcium carbonate prepared to have an average particle diameter of 1.6 μm was used. Thus, a coating liquid d was prepared.

(Example 5)
In Example 1, instead of the coating liquid a, the following coating liquid e was used, except that the same as in Example 1, for a pressure-sensitive sheet having a basis weight of 128 g / m ² and a density of 1.02 g / cm ³ . Coated paper was obtained.
[Preparation of coating liquid e]
Instead of heavy calcium carbonate prepared to an average particle size of 2.0 μm in coating solution a, the same procedure as in coating solution a was used except that heavy calcium carbonate prepared to an average particle size of 2.4 μm was used. Thus, a coating liquid e was prepared.

(Example 6)
In Example 1, in place of the coating liquid a, the following coating liquid f was used, except that the same as in Example 1, with a basis weight of 128 g / m ² and a density of 1.01 g / cm ³ . Coated paper was obtained.
[Preparation of coating solution f]
Oxidized starch dissolved in 20% aqueous solution in 62 parts by mass of heavy calcium carbonate (converted to solid content in the coating layer) prepared as an average particle size of 2.0 μm by a wet pulverization method and made into a 70% dispersion (trade name: Ace A) 10 parts by mass (in terms of solid content in the coating layer) and 28 parts by mass of styrene / butadiene copolymer resin (trade name: T-2531H) in a 50% latex (in terms of solid content in the coating layer) Was added and stirred, and water was added to prepare a coating solution f having a solid concentration of 60%.

(Example 7)
In Example 1, instead of the coating liquid a, the following coating liquid g was used, except that the same as in Example 1, with a basis weight of 128 g / m ² and a density of 1.00 g / cm ^{3 for} a pressure-bonding sheet. Coated paper was obtained.
[Preparation of coating liquid g]
Oxidized starch dissolved in a 20% aqueous solution in 72 parts by mass of heavy calcium carbonate (converted to solid content in the coating layer) prepared as a 70% dispersion by a wet pulverization method (trade name: Ace A) 20 parts by mass (in terms of solid content in the coating layer) and 8 parts by mass of styrene-butadiene copolymer resin (trade name: T-2531H) in the form of 50% latex (in terms of solid content in the coating layer) Was added and stirred, and water was added to prepare a coating solution g having a solid concentration of 60%.

(Example 8)
In Example 1, instead of the coating liquid A, the following coating liquid D was used, except that the same as in Example 1, for a pressure-sensitive sheet having a basis weight of 128 g / m ² and a density of 1.03 g / cm ³ . Coated paper was obtained.
[Preparation of coating solution D]
Instead of heavy calcium carbonate prepared to have an average particle size of 3.5 μm in coating solution A, the same procedure as in coating solution A was used except that heavy calcium carbonate prepared to have an average particle size of 3.2 μm was used. Thus, a coating liquid D was prepared.

Example 9
In Example 1, instead of the coating liquid A, the following coating liquid E was used, except that the same as in Example 1, with a basis weight of 128 g / m ² and a density of 0.99 g / cm ³ . Coated paper was obtained.
[Preparation of coating liquid E]
Instead of heavy calcium carbonate prepared to have an average particle size of 3.5 μm in coating solution A, the same procedure as in coating solution A was used except that heavy calcium carbonate prepared to have an average particle size of 3.8 μm was used. Thus, a coating solution E was prepared.

(Example 10)
In Example 1, in place of the coating liquid a, the following coating liquid h was used, except that the same as in Example 1, with a basis weight of 128 g / m ² and a density of 1.02 g / cm ³ . Coated paper was obtained.
[Preparation of coating liquid h]
40 parts by weight of heavy calcium carbonate prepared as an average particle size of 2.0 μm by a wet pulverization method and converted into a 70% dispersion (in terms of solid content in the coating layer) , kaolin (trade name: Hydra Gloss 90, manufactured by Huber) 30 parts (in terms of solid content in the coating layer ), 10 parts by mass of oxidized starch (trade name: Ace A) dissolved in a 20% aqueous solution (in terms of solid content in the coating layer), and styrene / butadiene as a 50% latex 20 parts by mass of copolymer resin (trade name: T-2531H) (in terms of solid content in the coating layer) was added and stirred, and water was added to prepare a coating liquid h having a solid content concentration of 60%.

(Comparative Example 1)
In Example 1, in place of the coating liquid a, except for using the following coating liquid i, the same as in Example 1, for a pressure-sensitive adhesive sheet having a basis weight of 128 g / m ² and a density of 1.03 g / cm ³ . Coated paper was obtained.
[Preparation of coating liquid i]
Instead of heavy calcium carbonate prepared to have an average particle diameter of 2.0 μm, the same as coating liquid a, except that heavy calcium carbonate prepared to have an average particle diameter of 1.2 μm was used. Thus, a coating liquid i was prepared.

(Comparative Example 2)
In Example 1, in place of the coating liquid a, except for using the following coating liquid j, the same as in Example 1 except that the basis weight is 128 g / m ² and the density is 1.00 g / cm ^{3 for} the pressure-bonding sheet. Coated paper was obtained.
[Preparation of coating liquid j]
Instead of heavy calcium carbonate prepared to an average particle size of 2.0 μm in coating solution a, the same procedure as in coating solution a was used except that heavy calcium carbonate prepared to an average particle size of 2.8 μm was used. Thus, a coating solution j was prepared.

(Comparative Example 3)
In Example 1, in place of the coating liquid a, the following coating liquid k was used, except that a coating weight k was used, as in Example 1, with a basis weight of 128 g / m ² and a density of 1.03 g / cm ³ . Coated paper was obtained.
[Preparation of coating solution k]
Instead of heavy calcium carbonate prepared to an average particle size of 2.0 μm of coating liquid a, kaolin (trade name: Capim DG, manufactured by Imeris Minerals Japan Co., Ltd.) having an average particle size of 2.0 μm was used. Except for the above, a coating liquid k was prepared in the same manner as the coating liquid a.

(Comparative Example 4)
In Example 1, in place of the coating liquid a, the following coating liquid l was used, except that the same as in Example 1, with a basis weight of 128 g / m ² and a density of 1.03 g / cm ³ . Coated paper was obtained.
[Preparation of coating solution 1]
Oxidized starch dissolved in 20% aqueous solution in 62 parts by mass of heavy calcium carbonate (converted to solid content in the coating layer) prepared as an average particle size of 2.0 μm by a wet pulverization method and made into a 70% dispersion (trade name: Ace A) 3 parts by mass (in terms of solid content in the coating layer) and 35 parts by mass of styrene / butadiene copolymer resin (trade name: T-2531H) in a 50% latex (in terms of solid content in the coating layer) Was added and stirred, and water was added to prepare a coating solution 1 having a solid concentration of 60%.

(Comparative Example 5)
In Example 1, in place of the coating liquid a, the following coating liquid m was used, except that the same as in Example 1, with a basis weight of 128 g / m ² and a density of 1.02 g / cm ³ . Coated paper was obtained.
[Preparation of coating solution m]
Oxidized starch dissolved in a 20% aqueous solution in 77 parts by weight of heavy calcium carbonate (solid content conversion in the coating layer) prepared as a 70% dispersion by a wet pulverization method (trade name: Ace A) 20 parts by mass (in terms of solid content in the coating layer) and 3 parts by mass of styrene / butadiene copolymer resin (trade name: T-2531H) in the form of 50% latex (in terms of solid content in the coating layer) Was added and stirred, and water was added to prepare a coating liquid m having a solid concentration of 60%.

(Comparative Example 6)
In Example 1, instead of the coating liquid a, the following coating liquid n was used, except that the same as in Example 1, with a basis weight of 128 g / m ² and a density of 1.00 g / cm ³ . Coated paper was obtained.
[Preparation of coating liquid n]
Polyvinyl alcohol (trade name: trade name: 70% by weight of heavy calcium carbonate prepared as a 70% dispersion (converted to solid content in the coating layer) and dissolved in a 22% aqueous solution by a wet pulverization method. 30 parts by mass of PVA117 ( manufactured by Kuraray Co., Ltd.) (in terms of solid content in the coating layer) was added and stirred, and water was added to prepare a coating liquid n having a solid content concentration of 60%.

(Comparative Example 7)
In Example 1, in place of the coating liquid A, except for using the following coating liquid F, the same as in Example 1, for a pressure-sensitive sheet having a basis weight of 128 g / m ² and a density of 1.01 g / cm ³ Coated paper was obtained.
[Preparation of coating solution F]
Oxidized starch dissolved in a 20% aqueous solution in 89.5 parts by mass of heavy calcium carbonate (solid content in the coating layer) prepared as a 70% dispersion by an average particle size of 3.5 μm by a wet grinding method (product) Name: Ace A) 20 parts by mass (in terms of solid content in the coating layer) and 0.5 part by mass of styrene / butadiene copolymer resin (trade name: T-2531H) in a 50% latex (in the coating layer ) Solid content conversion) was added and stirred, and water was added to prepare a coating solution F having a solid content concentration of 60%.

(Comparative Example 8)
In Example 1, instead of the coating liquid A, the following coating liquid G was used, except that the same as in Example 1, with a basis weight of 128 g / m ² and a density of 1.03 g / cm ^{3 for} a pressure-bonding sheet. Coated paper was obtained.
[Preparation of coating solution G]
Oxidized starch dissolved in a 20% aqueous solution in 85 parts by weight of heavy calcium carbonate (converted to the solid content in the coating layer) prepared as a 70% dispersion by a wet pulverization method (trade name: Ace A) 13 parts by mass (in terms of solid content in the coating layer) and 12 parts by mass (in terms of solid content in the coating layer ) of styrene / butadiene copolymer resin (trade name: T-2531H) as a 50% latex Was added and stirred, and water was added to prepare a coating solution G having a solid concentration of 60%.

(Comparative Example 9)
In Example 1, in place of the coating liquid A, except for using the following coating liquid H, the same as in Example 1 except that the basis weight is 128 g / m ² and the density is 1.03 g / cm ³ . Coated paper was obtained.
[Preparation of coating liquid H]
Instead of heavy calcium carbonate prepared to an average particle size of 3.5 μm in coating solution A, the same procedure as in coating solution A was used except that heavy calcium carbonate prepared to an average particle size of 2.8 μm was used. Thus, a coating liquid H was prepared.

(Comparative Example 10)
In Example 1, instead of the coating liquid A, for the pressure-sensitive adhesive sheet having the basis weight of 128 g / m ² and the density of 0.99 g / cm ³ except that the following coating liquid I was used. Coated paper was obtained.
[Preparation of coating liquid I]
Instead of heavy calcium carbonate prepared to have an average particle size of 3.5 μm in coating solution A, the same procedure as in coating solution A was used except that heavy calcium carbonate prepared to have an average particle size of 4.2 μm was used. Thus, a coating liquid I was prepared.

(Comparative Example 11)
In Example 1, in place of the coating liquid A, the following coating liquid J was used, except that a basis weight of 128 g / m ² and a density of 1.03 g / cm ³ was used for a pressure-bonding sheet in the same manner as in Example 1. Coated paper was obtained.
[Preparation of coating liquid J]
Instead of heavy calcium carbonate prepared to an average particle size of 3.5 μm of the coating liquid A, kaolin (trade name: Astra Plate, manufactured by Imerizu Minerals Japan, Inc.) having an average particle size of 3.8 μm was used. Except for the above, a coating solution J was prepared in the same manner as the coating solution A.

(Comparative Example 12)
In Example 1, instead of the coating liquid A, for the pressure-sensitive adhesive sheet having the basis weight of 128 g / m ² and the density of 1.02 g / cm ³ , except that the following coating liquid K was used. Coated paper was obtained.
[Preparation of coating liquid K]
Oxidized starch dissolved in a 20% aqueous solution in 80 parts by weight of heavy calcium carbonate (converted to solid content in the coating layer) prepared as a 70% dispersion by a wet pulverization method (trade name: Ace a) 20 parts by mass (in terms of solid content in the coating layer) and a nonvolatile content of 46% of latex and acrylic ester polymer resin (trade name: Primal AC2235, Rohm and Haas Japan Co., Ltd.) 10 parts by weight ( Solid content conversion in the coating layer) was added and stirred, and water was added to prepare a coating liquid K having a solid content concentration of 60%.

The coated paper for pressure-bonding sheets obtained in the examples and comparative examples was evaluated as follows, and the results are shown in Table 1.

〔Evaluation method〕
[Glossiness of blank paper]
Using a gloss meter described in JIS-Z8741 according to JIS-P8142: 2005 (75-degree specular gloss test method for paper and paperboard), the glossiness of the white paper portion of the coated paper for pressure-bonding sheets is JIS-P8142: 2005 It was measured.
[Paper density]
The paper density was measured according to JIS-P8118: 1998 (paper and paperboard—thickness and density test method). The basis weight of the paper was measured according to JIS-P8124: 1998 (paper and paperboard—basis weight measurement method) and used.

[Offset printing aptitude]
[Dry pick strength]
Solid printing was performed on the surface of the coated paper for pressure-bonding sheets, and the printed surface and the rubber roller (ink) surface were observed, and picking of the printed surface onto the ink surface was visually evaluated according to the following evaluation criteria.
Solid printing was performed with a RI printing tester (trade name: RI-1, manufactured by IHI Machine System Co., Ltd.) using a full surface rubber roller kneaded with test ink. Test ink (trade name: SD50 Red T-13 for Best One Paper Test, manufactured by T & K Tohka Co., Ltd.) was used.
5: Good without any picking.
4: Picking is slightly observed 3: Picking is slightly observed, but practically acceptable limit 2: Picking is frequently observed 1: Extreme picking is observed

[Wet pick strength]
Immediately after contacting the surface to be coated of the coated paper for pressure-bonding sheets with a Molton roller soaked with water using an RI printing tester, perform solid printing with a full surface rubber roller kneaded with test ink, and print surface And the rubber roller (ink) surface was observed and picking to the ink surface of a printing surface was visually evaluated on the following evaluation criteria.
The RI printing tester, rubber roller, and test ink were the same as those used in the dry pick strength evaluation.
5: Good without any picking.
4: Picking is slightly observed 3: Picking is slightly observed, but practically acceptable limit 2: Picking is frequently observed 1: Extreme picking is observed

[Inkjet ink absorption time]
The ink-jet ink absorption time was measured by the following procedure.
[Oil absorption meter (see JIS-P8130: 1994)]
a. A burette for dropping test oil, b. Roller (diameter: about 97 mm, length: about 100 mm, mass: 5.70 ± 0.05 kg, smooth-finished surface, made of chrome-plated iron), c. Roller rolling path (equipped with an oil-resistant rubber blanket with a thickness of about 1.8 mm on an iron plate, an inclined section of about 200 mm with a tilt angle of about 5 degrees, a horizontal section of about 800 mm, and a device that can hold the roller at the top. An oil coating portion having a device for receiving a roller at the other end, a dark box provided with a light projecting portion and a light receiving portion attached to a horizontal portion, and a specularly reflected light amount measuring portion comprising a galvanometer. The test piece is attached to a predetermined position in the dark box (on the rolling path at the center of the light projecting part and the light receiving part).
[Inkjet ink for testing]
Ink for Kodak Versamark DS 6240 Printing System (No. 1007)
[Second clock]
Those that can measure up to 0.1 seconds.
〔Test pieces〕
The coated sheet for the pressure-bonding sheet is cut out to about 65 × 200 mm to obtain a test piece.
[Procedure 1]
Open the cover of the dark box and attach it at a predetermined position so that the long side of the test piece is parallel to the roller rolling direction.
[Procedure 2]
Apply cellophane tape to the top of the test specimen (the direction in which the roller rolls).
[Procedure 3]
5 μl of the test ink-jet ink is dropped on the cellophane tape affixed on the test piece, and at the same time, the roller is started.
[Procedure 4]
As the roller passes over the test ink-jet ink drops, the ink drops are stretched and developed on the test strip. The disappearance of gloss on the developed ink film surface is visually observed, the number of seconds from the passage of the roller to the disappearance of gloss on the ink film surface is measured, and the ink-jet ink absorption time is measured.
The shorter the ink jet ink absorption time, the better the ink jet recording suitability, and preferably less than 5 seconds. If it is 7 seconds or more, ink absorption is slow and there is a possibility that it may have a practical effect.

[Average particle size]
As the average particle size of the pigment, the weight average particle size measured using a laser diffraction / scattering particle size distribution measuring device (trade name: Microtrack 3300EXII, manufactured by Nikkiso Co., Ltd.) was used.

[Peeling evaluation]
A two-fold pressure-bonded sheet was prepared from the coated paper for pressure-bonded sheets by the following procedure.
The created bi-fold crimped sheet was cut out to a width of 100 mm in a direction perpendicular to the fold line, and a test piece for peeling evaluation was created.
In the peeling evaluation, T-shaped peeling was performed at a peeling speed of 300 mm / min, an estimated average peeling force was drawn from the peeling curve, and the load of the peeling force was determined by N. Evaluation by peeling force was performed according to the following criteria.
When the strength of the coating layer is lower than the peeling force of the adhesive layer, the coating layer is destroyed at the time of peeling and cannot be used as a pressure-bonding sheet, and the peeling strength of the adhesive layer cannot be measured.
Peeling force less than 1.0 N: Peeling force is weak, and there is a concern of peeling during delivery of the pressure-bonded sheet.
Peeling force 1.0N or more and 3.0N or less: Range of peeling force having no practical problem.
Peeling force over 3.0 N: The peeling force is too strong, and the coated paper base material of the pressure-bonding sheet is destroyed at the time of peeling.
[Creation of two-fold crimped sheet]
Using a Mayer bar on the coated paper for the pressure-bonding sheet, a UV curable pressure-bonding varnish (trade name: Dicure Clear UV-1450HB, manufactured by Dainippon Ink & Chemicals, Inc.) has a solid content of 3 g / m ² . It was applied in such a manner that it was cured by irradiation with a 80 W / cm high pressure mercury lamp for 3 seconds to form an adhesive layer.
A dry sealer (trade name: Dry Sealer 6860, manufactured by Toppan Foams Co., Ltd.), which is formed by folding the paper so that the formed adhesive layers face each other inward and cut into a postcard size, has a pressure roll interval of 215 μm. ) Was used to make a two-fold crimped sheet.

As shown in Table 1, the pressure-sensitive adhesive sheet coated paper of the present invention has an appropriate matte feeling, excellent dry pick strength and wet pick strength, good offset printability, and inkjet ink absorption time. Is a coated paper for pressure-sensitive adhesive sheets that is short and has high ink-jet ink absorbability, and has excellent suitability as a hybrid printing paper. This is a pressure-sensitive adhesive sheet coated paper that can produce a sheet.

Claims (4)

After printing on coated paper, an adhesive layer area is provided on at least one surface of the paper, and the adhesive layers can be bonded by high pressure treatment so that they face each other. In the pressure-sensitive adhesive sheet coated paper used as a pressure-sensitive adhesive sheet in the post-glue pressure bonding method, the pressure-sensitive adhesive sheet coated paper is coated on at least one surface of the base paper with two or more layers mainly composed of a pigment and a binder. The outermost coating layer contains calcium carbonate having an average particle size of 1.5 to 2.5 μm as a pigment, and styrene / butadiene copolymer latex as a binder. The ratio of the styrene / butadiene copolymer latex per 100 parts by mass of the layer is 5 to 30 parts by mass, and the inner coating layer is provided between the substrate and the outermost coating layer. The layer has an average particle size of 3 0 to calcium carbonate particles of 4.0 .mu.m, containing styrene-butadiene copolymer latex as a binder, the ratio of the inner coating layer per 100 mass parts of styrene-butadiene copolymer latex is 1 to 10 parts by weight A coated paper for a pressure-bonding sheet, characterized by being.
The coated paper for pressure-bonding sheets according to claim 1, wherein the calcium carbonate is heavy calcium carbonate. The coated paper for pressure-bonding sheets according to claim 1, wherein the density of the coated paper according to JIS-P8118: 1998 is 0.90 to 1.15 g / cm ^3. . The pressure-sensitive adhesive sheet coated paper is a pressure-sensitive adhesive sheet coated paper used as a post-glue type pressure-sensitive adhesive sheet using a UV curable pressure-sensitive varnish. The coated paper for pressure-bonding sheets as described.