JP2002006749A - Tacky adhesive paper for self-peelable label, method for manufacturing the same and label using this tacky adhesive paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an efficient manufacturing method for tacky adhesive paper for labels without using release paper and to provide the tacky adhesive labels which may be inexpensively produced in small lots. SOLUTION: This method for manufacturing the tacky adhesive paper for the self-peelable labels has a process step of applying a thermosetting silicone to the front surface of a paper base material having high bulk density to the state of not allowing penetration down to the rear surface of the paper base material and a process step of applying a tacky adhesive to the rear surface of the paper base material. This tacky adhesive paper for the self-peelable label is obtained by this method. The labels are formed by using the tacky adhesive paper. Paper of >=0.75 g/cm3 in bulk density, >=30 seconds in air permeability (JIS P8117) and >=40 seconds in Bekk smoothness (JIS P8119) as the base material is used as the paper base material. A non-solvent thermosetting silicone of >=300 cP in viscosity is used as the silicone and is cured by heat treatment within 5 second after application to the state that the silicone does not penetrate down to the rear surface of the paper base material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-peeling label adhesive paper in which release paper is omitted, a method for producing the same, and a label using the adhesive paper.

[0002]

2. Description of the Related Art Label adhesive paper has label information continuously printed on its front face, and is cut or perforated so that each piece of label information can be easily separated. (1) a release paper (release paper) is placed on the surface of the adhesive layer to protect the adhesive layer, the release paper is peeled off and attached to a desired place, 2) The back surface (adhesive surface) in the state where a layer with release properties (release agent layer) is provided on the surface and wound into a roll
There is a self-peelable type which can be protected by a release agent layer and does not require a release paper.

[0003] Label paper adhesive paper of the type (1) combined with release paper has a large degree of freedom in selecting the shape and material,
The production cost is high, and it is necessary to remove the release paper during use. Moreover, the release paper after peeling becomes dust. For this reason, they are mainly used for office and personal use such as floppy (registered trademark) labels, price stickers and address stickers, as well as for promoting and explaining products, and for industrial use such as "handling care" used for transported goods. No need for release paper as label for (2)
The self-peeling type is often used.

[0004] Self-peeling type adhesive labels include:
A roll-shaped label tape is used in which printing is performed on the paper surface, an adhesive is applied to the back surface, and wax (polyethylene wax or the like) is applied on the printing surface to impart releasability and water resistance. However, depending on the storage environment, there are problems such as stickiness of the adhesive component and heavy peeling.

A self-peeling label sheet coated with silicone instead of wax is also known (for example,
JP-A-6-340190). Such a silicone is usually used in the form of a solution dissolved in an organic solvent for the purpose of easy application and avoiding uneven coating. However, since the silicone solution easily penetrates the paper, it is difficult to form a sufficient film on the surface. Increasing the amount of coating to form a sufficient film increases the cost, and furthermore, the silicone penetrates to the surface to which the pressure-sensitive adhesive is applied, preventing the effect of the pressure-sensitive adhesive. For this reason, there is a problem that desired label characteristics (self-peeling property and adhesiveness) cannot be realized. Therefore, usually, as shown in FIG. 3, a barrier layer 23 for preventing permeation of a silicone solution by laminating a polyolefin-based resin is provided on a surface of the paper 21 as a base material opposite to the adhesive layer 24. After applying a silicone solution on the surface of the barrier layer 23, the solvent is volatilized to form the release agent layer 22.

Characters and figures as label information can be printed on a paper base material before and after lamination. However, after lamination, the laminating layer hinders the adhesion and fixation of the ink to the paper substrate, causing cracks on the dried ink layer surface and problems such as printing dropping just by rubbing the printing surface. I do. Therefore, printing is usually performed before lamination. However, since the processes from printing to laminating are performed in an integrated manner, the fact is that in the production of small lot labels, the production unit price is quite high. Also, composite paper containing polyethylene laminate cannot be recycled as waste paper in the recycled paper process because polyethylene flakes remain as impurities.

[0007] Instead of a laminate layer, a layer of an ultraviolet curable resin, a hot melt resin, or the like may be provided (see JP-A-11-288222).
Or a special undercoat layer containing an acrylic emulsion polymer as a base paper for labeling by on-machine coating (that is, an operation of coating a semi-dry paper material in a paper machine) (JP-A-11-291407). ) Or by dissolving a silicone resin in a supercritical fluid (Japanese Unexamined Patent Publication No.
No. 68936), a method of forming a silicone thin layer without a solvent has also been proposed, but all of these methods have the problem that the process becomes complicated, special equipment and paper are required, and the cost is increased.

On the other hand, a kraft tape for packaging has a specific interlayer strength (100 g) without a barrier layer.
/ 15 mm), size degree (12 seconds or more), supercalendering on the surface of kraft paper having air permeability (12 seconds or more) to smoothness of 200 seconds or more, and solventless silicone having a viscosity of 200 cP or more. Method for producing pressure-sensitive adhesive tape paper base material which is applied to form release agent layer
No. 196994), a method for producing a pressure-sensitive adhesive tape paper base material in which a solvent-free silicone is applied in two steps to kraft paper having the same specific interlayer strength, size and air permeability to form a release agent layer (Japanese Patent Laid-Open No. No. 34047) have been proposed, but these are not intended for use as labels, so that it is difficult to obtain proper printing characteristics, and processing costs such as super calendar processing are large.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in a self-peeling label adhesive paper which does not use a release paper. The purpose is to provide useful adhesive paper as label paper.

[0010]

Means for Solving the Problems The present inventors have developed a conventional release agent layer / adhesive paper for a self-releasable label adhesive paper which does not use a release paper.
After examining a configuration different from the barrier layer / paper substrate / adhesive layer structure, use a solvent-free silicone with a high-rigidity and high-smoothness paper as the base material and a specific range of viscosity after coating. The present inventors have found that a heat treatment within a short period of time can provide a pressure-sensitive adhesive paper for a label in which lamination or sealing can be omitted, thereby completing the present invention. That is,
The present invention provides the following self-releasing adhesive paper for labels, a method for producing the same, and a label using the adhesive paper.

(1) A step of applying a thermosetting silicone to the surface of a paper substrate having high tension so as not to penetrate to the back surface of the paper substrate and curing the same; and applying an adhesive to the back surface of the paper substrate. A method for producing a self-peeling label pressure-sensitive adhesive paper, comprising a step of applying. (2) The above-mentioned 1 using a solvent-free thermosetting silicone.
5. The method for producing a self-peelable pressure-sensitive adhesive paper according to the above. (3) The method for producing a self-peeling label adhesive paper according to the above (1), comprising a step of printing on the surface of the paper base material before the step of applying and curing the thermosetting silicone on the paper base material. . (4) The method for producing a self-peeling label pressure-sensitive adhesive paper according to the above item 3, wherein an ultraviolet-curable ink containing an ultraviolet-curable silicone is used for printing. (5) The method for producing a self-peeling label adhesive paper according to the above 1, further comprising a step of forming a cut or a perforation for separating the label. (6) Tension 0.75 g / cm ³ or more, air permeability (JIS P8117)
2. The method for producing an adhesive paper for a self-peeling label according to the above 1, wherein a paper base material having a Beck smoothness (JIS P8119) of 40 seconds or more is used for 30 seconds or more.

(7) The method for producing a self-peeling label adhesive paper according to the item (6), wherein the paper substrate is selected from high-quality paper, lightweight coated paper and coated paper. (8) The self-peeling property as described in 1 above, wherein a solvent-free thermosetting silicone having a viscosity of 300 cP or more is applied, and heat treatment is performed within 5 seconds after application to cure the silicone without penetrating to the back surface of the paper base material. A method for producing adhesive paper for labels. (9) The coating amount of the thermosetting silicone is 0.5 to 2 g / c.
9. The method for producing a self-peeling label pressure-sensitive adhesive paper according to any one of the above 1 or 8, which has a range of m ² . (10) 100 to 15 curing steps after silicone coating
9. The method for producing a self-peeling label pressure-sensitive adhesive paper according to the above 1 or 8, wherein the method is carried out by maintaining the temperature at 0 ° C. for 1 to 30 seconds. (11) Thermosetting cured and applied to the surface of a paper substrate in a state where it does not penetrate to the back surface of self-peeling label adhesive paper that has printed material on the surface and has been cut or perforated for cutting An adhesive paper for a self-releasable label, comprising: an adhesive silicone layer; and an adhesive layer applied to the back surface of a paper substrate. (12) An adhesive paper for a self-peelable label obtained by any one of the above-mentioned methods 1 to 10. (13) A label using the self-peeling label pressure-sensitive adhesive paper manufactured by the method according to any one of (1) to (10) above.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The self-peeling label pressure-sensitive adhesive paper of the present invention is provided with a silicone (release agent) layer inside the paper base without reaching the front and back of the base without using a barrier layer. It is. Hereinafter, the structure and production method of the pressure-sensitive adhesive paper for a label of the present invention and the label using the same will be described in detail.

(A) Label Adhesive Paper As shown in the cross-sectional view of FIG. 1, the adhesive paper of the present invention has a release agent layer 2a on one surface (surface) of a high-tension paper substrate 1. A part of the release agent has a release agent permeable layer 2b in the base material within a range not reaching the back surface of the paper base material. The release agent layer 2a and the release agent permeable layer 2b are cured silicone layers, and the release agent permeable layer 2b
Is a layer in which silicone penetrates between the constituent materials of the base material (fiber such as cellulose, coating agent and other additives) and is hardened. The pressure-sensitive adhesive layer 4 is provided on the opposite surface (back surface) of the paper base material, and a region 3 in which silicone has not penetrated is interposed between the release agent permeable layer 2b and the pressure-sensitive adhesive layer 4. The paper used as the base material in the present invention is a high-tensile paper. Here, the high tension refers to a tension at which the porosity is 50% or more, and is usually a tension.
0.75 g / cm ³ or more. In particular, (i) a tension of 0.75 g / cm
³ or more, (ii) air permeability (JIS P8117) 30 seconds or more, and (ii)
i) Smoothness (JIS P8119) Paper satisfying the condition of 40 seconds or more is preferable.

In the present invention, the tension, which is the apparent density of paper,
It must be 0.75 (g / cm ³ ) or more. When the tension is lower than this (that is, when the porosity is high), the penetration into the paper base proceeds in a short time even if a specific silicone having a relatively high viscosity which can be applied as described later is used, and the paper base It is difficult to control so that it does not penetrate to the back surface. It is preferably 0.75 or more for uncoated paper and 0.9 or more for coated paper.
The upper limit of the tension may be such that the silicone can penetrate to the extent that it does not reach the back surface. However, uncoated paper with a tension of more than 1.1 (for example, glassine paper) is expensive and may be manufactured as label base paper. The cost is high.

The air permeability is a value representing the time required for a predetermined amount of air to pass vertically through the paper in seconds.
The lower the air permeability, the higher the vertical permeability of the paper. The air permeability is related to the porosity of the paper base material. When the air flow path exists between the front and back of the base material, the value of the air permeability is small even if the porosity is low (that is, the air permeability). Is higher). The air permeability of the paper substrate used in the present invention is 30 seconds or more, preferably 40 seconds or more. If the air permeability is less than 30 seconds, the penetration of the silicone liquid into the paper base proceeds in a short time due to the capillary phenomenon, so that it is difficult to control the penetration depth.

The smoothness is a measure of the smoothness of the paper surface, and the Beck smoothness is such that a test paper is placed on a flat bed having a hole in the center, and the test paper is a predetermined weight plate having a smooth bottom surface. It is a value measured in seconds until a predetermined amount of air is sucked by covering and sucking through the hole.
If there is unevenness on the surface of the test paper, this becomes a flow passage and air flows in. Therefore, the larger the unevenness on the paper surface, the smaller the Beck smoothness. The Beck smoothness of the paper substrate used in the present invention is 40 seconds or more, preferably 50 seconds or more. Smoothness is 4
If the time is less than 0 second, the formation of the film by the silicone becomes insufficient or non-uniform due to large surface irregularities. The upper limit is not particularly limited, but generally, the smoothness is improved by a calendering process or a coating process, so that the manufacturing cost increases to increase the smoothness.

A major feature of the method of the present invention is that a conventional commercially available paper material can be used as it is, but it may be prepared by applying a coating agent or calendering a commercially available paper. Examples of paper that can be used in the present invention without or with these treatments include fine wood for uncoated paper. Coated paper includes coated paper such as light coated paper. Kraft paper has a tension of 0.6.
-0.7, which is not used in the present invention. As described above, on paper whose tension is lower than the range specified in the present invention,
A stable silicone film cannot be formed because the silicone solution or low-viscosity solventless silicone instantaneously penetrates into the paper substrate. Also, kraft paper, especially kraft tape, is generally treated with clupak (a process of imparting fine shrinkage wrinkles for the purpose of enhancing extensibility and making the surface rough structure), so it is intended to apply solventless silicone. Then, there is a problem that fine fibers on the surface of the kraft paper fall off due to a shearing force acting between the coating means and the uniformity of the release agent layer. Even if the surface of the kraft paper is subjected to a super calendering treatment or the like to improve the smoothness or the like of the surface, the rise in the tension is small and the production cost is increased.

The release agent used in the present invention is a polyorganosiloxane derivative generally called silicone. The viscosity of the silicone used in the present invention is 300 cP to 5000 cP or less, preferably 3000 cP or less when not dissolved in a solvent. If it is less than 300 cP, the permeability to the paper surface is high even without solvent, and the effect of the present invention cannot be sufficiently exhibited.
If the viscosity of the silicone is too high, it is difficult to form a sufficiently uniform film on the paper surface.

The thermosetting property of silicone depends on its structure, the type and amount of catalyst, but in the present invention, it is usually from 100 to 100.
One that can be cured at a temperature of 150 ° C for 1 second to 1 minute, preferably one that can be cured at a temperature of 100 to 140 ° C for 1 to 30 seconds is used. If the curing temperature and the curing time are outside the above ranges, the productivity will be reduced, and in some cases, the quality of the paper substrate will be adversely affected.

The chemical structure of the organosiloxane derivative is
There is no particular limitation as long as it has the above viscosity and is thermosetting. For example, conventionally, solventless silicone used for release paper in adhesive paper using release paper can be used as long as it satisfies the viscosity conditions and thermosetting conditions described below. Various types of such solvent-free silicones have been proposed (for example, JP-A-5-156167, JP-A-6-91818, JP-A-6-220327, JP-A-6-25602, and Patent No. 2554925). In general, it contains an organopolysiloxane in which one or more reactive groups such as unsaturated groups are bonded to one or more silicon atoms in one molecule, and usually further contains a catalyst and optionally a curing control agent. Examples of the catalyst include a tin-based catalyst for the condensation reaction-curing type and various platinum-based catalysts such as chloroplatinic acid and chloroplatinic acid for the addition-reaction curing type. It is. However, in the present invention, silicones other than those mentioned here can be used as long as the penetration depth into the substrate can be controlled by thermosetting.

The amount of silicone to be applied depends on conditions such as the tension of the base paper and the viscosity of the silicone.
5 g / m ^2, preferably from 0.5 to 2 g / m ^2, more preferably 0.6~1.5g / m ^2, more preferably 0.7 to 1.2 g / m ²
Range. If the coating amount of the silicone is small, the silicone film formed on the surface of the base material becomes insufficient, or the film is not uniformly formed and the releasability is reduced. Also, excessive use leads to an increase in the cost of the product, which is not preferable.

As the pressure-sensitive adhesive used for the label pressure-sensitive adhesive paper of the present invention, a conventional pressure-sensitive adhesive can be used. In the present invention, since there is no contact between the uncured silicone and the pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer is not limited.For example, acrylic pressure-sensitive adhesives, natural rubber-based, synthetic rubber-based rubber-based pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives Pressure-sensitive adhesives, silicone-based pressure-sensitive adhesives and the like can be mentioned. For labels and the like used outdoors, an acrylic pressure-sensitive adhesive is suitably used because it has good weather resistance. The acrylic pressure-sensitive adhesive contains an acrylic copolymer as a main component, and is preferably crosslinked with a crosslinking agent. When the demand for the weather resistance is not strict, a rubber-based pressure-sensitive adhesive is advantageous in that it is inexpensive. Examples of the base polymer of the rubber-based pressure-sensitive adhesive include a styrene-isoprene-styrene block (SIS) copolymer and a styrene-ethylenebutylene-styrene block (SEBS) copolymer. -Indene, terpene, petroleum resin,
It is formed by combining a styrene-based, phenol-based, xylene-based tackifying resin or the like. As the dosage form of the adhesive, any of a solvent type, an emulsion type, and a hot melt type can be used, but as will be described later, the emulsion type is applied to its application method in relation to printing of label information and cut processing. There is a limit.

(B) Method for Producing Adhesive Label In the present invention, after applying silicone onto a substrate,
A heat curing treatment is performed within a short time to control the depth of penetration of the silicone into the paper substrate. The time from application to thermal curing is about 0.1 to 5 seconds, preferably 2 seconds or less. If this time is too long, the penetration of the silicone into the base material proceeds,
The structure shown in FIG. 1 cannot be obtained. In order to shift to the heat curing treatment within such a short time, for example, a manufacturing process described below is employed.

FIG. 2 schematically shows a typical process for producing a label adhesive paper according to the present invention.
In the figure, the continuous paper 11 drawn from the base paper roll 10 is
The rollers 12a to 12e are wound as a product roll 19 through a printing unit 13, a silicone coating unit 14, a drying unit (thermosetting unit) 15, a cut processing unit 16, an adhesive application unit 17, and a drying unit 18. In the printing unit 13, label information is printed, and in the silicone applying unit 14, silicone is applied to the surface by, for example, a roller coater. The continuous paper 11 coated with silicone is immediately led to the drying unit 15 provided immediately after the coating unit.
The time during this period is about 0.1 to 5 seconds, preferably 2 seconds or less, as described above. While passing through the drying unit 15, the silicone is cured (cured). After curing, the continuous paper 11 is subjected to a cut processing for cutting in a cut processing section 16, and then guided to an adhesive application section 17 to be coated with an adhesive, and a drying section 18 provided as necessary. Is wound up and held by the product roll 19. Although not shown in the figure, usually, the product is cut into a predetermined width and length, and then wound up as a product roll.

In the above-mentioned process, for example, as a means for applying the silicone liquid, a roll coater, a gravure coater, an air coater, a curtain flow coater or other conventional application means can be used according to the viscosity. The same applies to the application of the adhesive. Various methods such as hot air and radiant heat (for example, an electric heater) can be used as the drying means. The above example is an example of the manufacturing process of the present invention, and various changes and modifications are possible.
For example, only the application and drying of silicone may be performed as a series of steps, and this may be held as base paper, and an adhesive may be applied as needed to complete the adhesive paper. Alternatively, it is also possible to use the cut paper instead of the continuous paper, and to continuously apply and dry the silicone by using a conveying means such as a belt conveyor.

(C) Printing and Cut Processing In the above process, printing can be performed by any method. Although the type of ink is not limited, when a certain kind of ink is used, the self-releasable label is wound in a roll shape and held, and then unwrapped, the ink may be transferred to the adhesive layer in a dotted manner. is there. Although the cause has not been identified, a problem occurs remarkably particularly when vermilion ink is used, and it is conceivable that inorganic ions in the ink may act as a catalyst poison during silicone curing. It has been found that this problem is overcome by including silicones, especially UV-curable silicones, in the ink. For example, the above problem can be solved by a method in which an ultraviolet-curing silicone is mixed with the ink, and after printing, the printing layer is formed by irradiating ultraviolet rays, followed by formation of a release layer and formation of an adhesive layer. The amount of silicone added to the ink depends on the degree of occurrence of the above problem, but is usually 10% by weight or less. Preferably, the added silicone and the ink are simultaneously cured by using the UV-curable ink in combination.

The UV-curable silicone which can be used may be a conventional one. For example, (meth) at the molecular end or side chain
An acryloyl group, a methacryloyl group, a vinyl group, a silicone resin having a functional group such as an epoxy group, an acrylate or methacrylate containing a long-chain alkyl group and a silicone-modified compound thereof, and, if necessary, a photoreaction initiator and a sensitizer. In addition, compositions formed are mentioned. The ultraviolet curable ink that can be used is not particularly limited. Examples of such inks include, for example, inks containing an ultraviolet curable resin such as polyester acrylate, urethane acrylate, epoxy acrylate, and polyol acrylate.

Also, a separation line such as a cut or perforated line is provided so that a label can be attached to a predetermined place without using cutting tools such as scissors. Such a separation line must be provided for each label display unit so as not to divide the contents of the label display (for example, the display of “Handling Caution”). The method of forming the separation line may be a method using a slitter, a method of pressing a comb-shaped blade, a method of moving a gear-shaped cutting tool at right angles to the traveling direction of paper, a method of sequentially piercing with a pin, and the like. Methods can also be used. In FIG. 2, the cut processing step is performed after the adhesive is dried, but may be provided at any stage. For example, it can be performed before and after the printing step, or between the drying step after applying silicone and the adhesive applying step. When an emulsion-type adhesive is used, the strength of the paper is reduced due to the inclusion of moisture. Therefore, it is preferable to provide a perforation after applying the adhesive and drying. In addition,
The pressure-sensitive adhesive label of the present invention is suitably used as a roll-shaped product having the above-mentioned perforations, but is a stack-shaped product obtained by cutting a predetermined size and stacking such that the pressure-sensitive adhesive layer and the release agent layer are in contact with each other. It is also possible to use

[0030]

The present invention will be described more specifically with reference to the following examples and comparative examples. In the following examples, the measurement of the peeling force and the adhesive force was performed according to the following procedure. Peel Force Measurement Test The manufactured pressure-sensitive adhesive paper sample was cut into an appropriate length, and bonded so that the pressure-sensitive adhesive layer overlapped the release agent layer. This corresponds to a state in which the self-peeling adhesive paper is wound in a roll shape. After standing one day and night, the sample was cut into 5 cm width, pulled at 180 ° angle at a peeling speed of 0.3 m / min using a tensile tester, and the force (g) required to peel off the adhesive paper in the bonded state was measured. It was measured. Adhesive strength measurement test Adhesive strength was evaluated by attaching the adhesive paper to a washed and dried aluminum plate, and measuring the force (g) required to peel off the attached adhesive paper from the aluminum plate in the same manner as described above. In addition, since the adhesive force greatly depends on the state of the adhered surface, the following example is used only for the purpose of evaluating whether or not the adhesive force has changed with time.

Example 1 As a base material (base paper), high quality paper ("Shiraoi" manufactured by Daishowa Paper Co., Ltd .; basis weight: 64 g / m ² , tension: 0.81 g / m ³ , air permeability: 33 seconds, A continuous sheet having a smoothness of 51 seconds) was used. After printing on the base paper surface by letterpress printing using black ink, solvent-free silicone (KNS-3051 manufactured by Shin-Etsu Chemical Co., Ltd .; viscosity: 400 cP; containing 2% of a platinum-based catalyst) was added to the base paper using a roll coater. g / m ² ,
It was introduced into the dryer set at 130 ° C. in 1.5 seconds, and passed through the dryer as it was over 15 seconds.

After drying, an adhesive (PSA.AV-6025 manufactured by Showa Polymer Co., Ltd .; strong adhesive type) is coated on the surface opposite to the release agent layer at a solid content of 25 g / m ² . After drying, the rolls were wound up into rolls, and the rolls were piled up sideways in an environment of 25 ° C. and 60% RH, kept for 1 day, 1 week and 1 month, and examined over time for changes in label characteristics. As a result, it was confirmed that there was no displacement between the layers even after being left for one month, and it was possible to smoothly rewind. In addition, the state of the adhesive surface after rewinding is good, and
Almost no change in the adhesive force with time was observed. Transfer of the ink to the adhesive surface was not observed with the naked eye.

[0033] performs printing on entire one surface of the paper substrate using an ultraviolet curing ink for red instead Comparative Example 1 black ink, after the ink curing by ultraviolet radiation, to produce a red label in the same manner as in Example 1 And the label characteristics (peeling force / adhesive force) were evaluated. Almost no change in label characteristics over time was observed, but it was observed that the red ink was transferred to the adhesive surface as fine dots in some places.

Example 2 The same procedure as in Comparative Example 1 was carried out except that 5 parts by weight of an ultraviolet-curable silicone (SD-7333 manufactured by Dow Corning Toray Co.) was added to 100 parts by weight of the ink, and the entire surface of the paper substrate was coated. A printed red label was manufactured, and the label characteristics were evaluated. Almost no change in label characteristics over time was observed, and no transfer of the red ink to the adhesive surface was observed.
The peeling force of this label after pasting it all day and night is 20g / 5
cm, which is about the same level as the peeling force of a commercially available highly adhesive label paper, and it was confirmed that the sheet was easily peelable. In addition,
The kraft adhesive tape (No. 712 manufactured by Nitto Denko) has a peeling force of 140 g / 5 cm, which is seven times as high as the label of the present invention.

Example 3 The same continuous sheet of high-quality paper as in Example 2 was used as a base paper, characters were printed on the surface in the same manner, and perforations were made every 20 cm by a conventional method (perforation length 1.8 mm, Perforation width 0.1mm
Example 1 was repeated except that a gap of 0.9 mm between perforations was inserted, and solvent-free silicone having a viscosity of 1500 cP (SP-7259 manufactured by Dow Corning Toray Co., Ltd.) was applied at a coating amount of 0.9 g / m ² as silicone. Coating and drying of the silicone and application of the pressure-sensitive adhesive layer were performed in the same manner as in the above. The sample was held for one day, one week and one month as in Example 2. As a result, it was confirmed that there was no displacement between the layers even after being left for one month, and it was possible to smoothly rewind. In addition, no transfer of the release agent to the adhesive surface was observed, no exudation of the adhesive from the perforations, and almost no change in the adhesive strength was observed. In addition, the separation at each perforation was smooth, and the usefulness as a label was excellent.

Example 4 As a base material (base paper), coated paper (Daishowa Paper Co., Ltd.)
Ltd. "Shiraoi coat"; basis weight 73g / m ^2, bulk density 1.17g
/ M ³ , smoothness 1600 seconds) and solvent-free silicone (KNS-3051 manufactured by Shin-Etsu Chemical Co., Ltd .; viscosity 400c)
A sample was prepared in the same manner as in Example 2 except that P) was applied at a coating amount of 0.8 g / m ² , and the sample was similarly held for one day, one week and one month. As a result, it was confirmed that there was no displacement between the layers even after being left for one month, and it was possible to smoothly rewind. In addition, no migration of the release agent to the adhesive surface was observed, and almost no change was observed in the adhesive strength.

Example 5 The same coated paper as in Example 3 was used as a base material (base paper), and printing and coating of solvent-free silicone (SP-7259 manufactured by Toray Dow Corning Co., Ltd.) were performed in the same manner as in Example 3. Quantity: 1.
After 1 g / m ² ), the mixture was introduced into a dryer set at 140 ° C. in 1.5 seconds, and passed through the dryer as it was over 15 seconds. A pressure-sensitive adhesive was applied in the same manner as in Example 1 to prepare a roll-shaped pressure-sensitive adhesive paper sample, which was held for one day, one week, and one month. As a result, it was confirmed that there was no displacement between the layers even after being left for one month, and it was possible to smoothly rewind. In addition, no migration of the release agent to the adhesive surface was observed, and almost no change was observed in the adhesive strength.

Comparative Examples 2 to 3 Ryosara Kraft paper (manufactured by Daishowa Paper Co., Ltd .; basis weight 53 g / m ² , strength 0.66 g / m ³ , air permeability 16 seconds) as a base material (base paper) A sample was prepared in the same manner as in Examples 1 and 2, except that the sample was used, and the sample was similarly held for one day to one week. It was confirmed that the peeling force of each of these was uneven after holding for one day and night, and it was difficult to perform smooth peeling.

Comparative Examples 4 and 5 The high- quality paper used in Example 1 or Example 2 was used as a base material (base paper), and the time required from application of solventless silicone to introduction into the drying chamber was 8 seconds. Other than that, an adhesive paper sample was prepared in exactly the same manner as in Example 1. After being left overnight in a roll state, when the film was rewound, uneven peeling was observed, confirming that the release agent layer was not formed sufficiently uniformly.

Comparative Examples 6 and 7 The high- quality paper used in Example 1 was used as a base material (base paper), and the coating amount of solventless silicone was 0.4 g / m ² (Comparative Example 6) or 2.2 g / m 2. An adhesive paper sample was prepared in exactly the same manner as in Example 1 except that ² (Comparative Example 7) was used. After left overnight in a roll state and then unwound, the material with a small amount of coating (Comparative Example 6) had an extremely poor peeling force exceeding 160 g / 5 cm, and the release agent layer was not sufficiently formed. Was confirmed. On the other hand, in the case of a material having an excessive amount of coating (Comparative Example 7), it was left in a roll state and rewound to check the adhesive strength.
The silicone film strength was rather weak and the deterioration with time was remarkable.

[0041]

The adhesive paper of the present invention does not include a laminating step using a laminator, and is a manufacturing process consisting of only steps that can be handled by ancillary equipment of a normal printing machine such as coating, printing, drying and perforation. Since production is possible, production in small lots is possible, and the production cost can be significantly reduced. Specifically, the manufacturing cost can be reduced to a level where the production can be profitable even with the conventional production amount of 1/1000. Further, the conventional craft tape having a barrier layer such as polyethylene cannot be used as recycled paper, and there is a possibility that a problem may occur even in a process of recycling corrugated cardboard or the like to which the tape is adhered, but the adhesive paper of the present invention is used as recycled paper. As a result, there is no problem in waste disposal.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a basic structure of an adhesive paper according to the present invention.

FIG. 2 is a schematic view showing an outline of a process for producing an adhesive paper according to the present invention.

FIG. 3 is a cross-sectional view showing a basic structure of a self-peeling label pressure-sensitive adhesive paper according to a conventional technique.

[Explanation of symbols]

 Reference Signs List 1 base material (base paper) 2a release agent layer (paper surface) 2b release agent layer (inside of paper) 3 layer composed of only base material 4 adhesive layer 10 base paper roll 11 continuous paper 12a to 12e roller 13 printing unit 14 Silicone-coated part 15 Drying part (thermosetting part) 16 Adhesive part 17 Drying room 18 Cut part 19 Product roll (adhesive paper) 21 Base material 22 Release agent layer 23 Barrier layer 24 Adhesive layer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09F 3/02 G09F 3/02 FNF term (Reference) 4D075 BB46Z CA07 DA04 DB18 DC38 EA05 EA21 EB42 4F100 AK52B BA03 BA07 BA10B BA10C DG10A EH461 GB90 HB31A JB13B JL13C JL14

Claims (13)

[Claims] 1. A step of applying and curing a thermosetting silicone on a surface of a paper substrate having high tension so as not to penetrate to the back surface of the paper substrate, and applying an adhesive on the back surface of the paper substrate. A method for producing a self-peeling label pressure-sensitive adhesive paper, comprising the steps of: 2. The method for producing a self-peeling label pressure-sensitive adhesive paper according to claim 1, wherein a solvent-free thermosetting silicone is used. 3. The self-peeling label adhesive paper according to claim 1, further comprising a step of printing on the surface of the paper base before the step of applying and curing the thermosetting silicone on the paper base. Manufacturing method. 4. The method according to claim 3, wherein an ultraviolet-curable ink containing an ultraviolet-curable silicone is used for printing. 5. The method for producing an adhesive paper for a self-peeling label according to claim 1, further comprising a step of cutting or perforating the label for separation. 6. A stiffness of 0.75 g / cm ³ or more and an air permeability (JIS P
8117) The method for producing a self-peeling label adhesive paper according to claim 1, wherein a paper base material having a Beck smoothness (JIS P8119) of 40 seconds or more is used for 30 seconds or more. 7. The method according to claim 6, wherein the paper substrate is selected from high quality paper, lightweight coated paper and coated paper. 8. The method according to claim 1, wherein a solvent-free thermosetting silicone having a viscosity of 300 cP or more is applied, and a heat treatment is performed within 5 seconds after application to cure the silicone without penetrating to the back surface of the paper substrate. A method for producing self-peeling adhesive paper for labels. 9. The coating amount of the thermosetting silicone is 0.5 to 2
method for producing self-releasing label adhesive paper as claimed in claim 1 or 8 is in a range of g / cm ^2. 10. The curing step after silicone application is 100
The method for producing a self-peeling label pressure-sensitive adhesive paper according to claim 1 or 8, wherein the method is carried out by maintaining the temperature at a temperature in the range of -150 ° C for 1-30 seconds. 11. An adhesive paper for a self-peeling label having a printed material on its surface and having been cut or perforated for cutting, which was applied to the surface of the paper base material without being penetrated to the back surface and cured. An adhesive paper for a self-peeling label, comprising a thermosetting silicone layer and an adhesive layer applied to the back surface of a paper substrate. 12. An adhesive paper for a self-peeling label obtained by the method according to claim 1. 13. A label using a self-peeling label pressure-sensitive adhesive paper produced by the method according to claim 1. Description: