JP2008248035A - Pressure-sensitive adhesive sheet and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure-sensitive adhesive sheet which has tacky portions having different tack on one or both surfaces thereof and is suitable for recycling. <P>SOLUTION: The pressure-sensitive adhesive sheet has a pressure-sensitive adhesive base paper having a plurality of tacky portions having different tack strength on one or both surfaces thereof and a release paper covering the tacky portions, and the amount of the residue in the dissociation test is less than 50 mg, and the pressure-sensitive adhesive sheet is totally dissociable, and the tacky portions having different tack strength are formed of pressure-sensitive adhesives having different tack strength, and in part of the tacky portions or all tacky portions, the pressure-sensitive adhesive layers have undergone a non-tackifying treatment. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive portion and a method for producing the same.

Adhesive sheet with adhesive part on the front or back of the sheet is sticker (tack paper) to be applied to the desired object, index sticker to be attached to paper products such as books and notebooks, adhesive and re-peelable It is used for various applications such as a sticky note, an envelope in which a sealing adhesive portion is arranged on a label, and a concealing postcard.
As described above, it is important for the pressure-sensitive adhesive sheet to design the pressure-sensitive adhesive force and the arrangement form of the pressure-sensitive adhesive portion because of the variety of uses.
In recent years, an attempt has been made to develop a pressure-sensitive adhesive sheet having two or more pressure-sensitive adhesive portions having different adhesive forces on one surface.
By the way, in order to effectively use pulp resources, paper products are actively recycled.
However, in the pressure-sensitive adhesive sheet, the pressure-sensitive adhesive may inhibit the releasability of the recycled pulp, which may hinder recycling.
For example, in magazines and catalogs in which index stickers or character stickers that are adhesive sheets are spelled as appendices, a complicated operation for removing the adhesive sheets is required for recycling.
JP 2004-271667 A

  Then, the main subject of this invention is providing the adhesive sheet which has a some adhesive part from which adhesive force differs on one side or both surfaces, and is suitable for recycling.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
An adhesive base paper having a plurality of adhesive portions with different adhesive forces on one or both sides;
A release sheet that covers the adhesive portion, and an adhesive sheet comprising:
The amount of residue in the dissociation test is less than 50 mg.
A pressure-sensitive adhesive sheet.

<Invention of Claim 2>
The pressure-sensitive adhesive sheet according to claim 1, wherein the pressure-sensitive adhesive sheet is fully dissociable.

<Invention of Claim 3>
The pressure-sensitive adhesive sheet according to claim 1 or 2, wherein the pressure-sensitive adhesive portions having different pressure-sensitive adhesive forces are formed of pressure-sensitive adhesives having different pressure-sensitive adhesive forces.

<Invention of Claim 4>
The pressure-sensitive adhesive sheet according to any one of claims 1 to 3, wherein a part or all of the pressure-sensitive adhesive portion is formed by paste-killing the pressure-sensitive adhesive layer.

<Invention of Claim 5>
The pressure-sensitive adhesive sheet according to any one of claims 1 to 4, wherein a release paper having a partial peeling function is used.

<Invention of Claim 6>
On one side of a water-decomposable or alkali-dissociable base paper, a fully-disintegrating adhesive is applied, applied or printed in a preset pattern to form an adhesive part, and then the adhesive part is hydrolysable or alkali-dissociated. A method for producing a pressure-sensitive adhesive sheet, characterized by covering with an adhesive release paper.

  As described above, according to the present invention, a pressure-sensitive adhesive sheet having a plurality of pressure-sensitive adhesive portions having different adhesive forces on one side or both sides and suitable for recycling is provided.

Next, embodiments of the present invention will be described in detail below with reference to the drawings.
“First Embodiment”
In the first embodiment, a seal product X1 in which an index sticker extending from the page edge of a book to add a headline and a check sticker that can be used as a sticky note that can be repeatedly attached and detached are formed on the same adhesive base paper. It is.
FIG. 1 is a plan view of the seal product X1, and FIG. 2 is a sectional view taken along the line II-II of FIG.

This seal product X1 is mainly composed of an adhesive base paper having an adhesive layer 2 formed of an adhesive on one side of the base paper 1 and a release paper 3 covering the adhesive layer forming surface of the adhesive base paper. Is done.
The adhesive base paper includes a plurality of index seal portions 1i, 1i,... And a plurality of check seal portions that can be individually peeled off from the release paper 3 by auxiliary cutting lines L made of perforation lines, half slit lines, slit lines, and the like. 1c, 1c... Are formed.
Although the shape of the index seal portions 1i, 1i... And the check seal portions 1c, 1c... Is not limited, the index seal portion 1i has a rectangular shape close to a square as a typical shape in this embodiment. It has a rectangular shape.
On the other hand, the pressure-sensitive adhesive layer 2 is not formed on the entire surface of the base paper 1, but is disposed so as to cover only a part of the index seal portion 1i and the check seal portion 1c.
Therefore, each of the index seal portion 1i and the check seal portion 1c has adhesive portions 2Hi and 2Lc where the adhesive layer 2 is disposed, and non-adhesive portions 2N and 2N where the adhesive layer is not disposed.

In the seal product X1 of this embodiment, the adhesive force of the adhesive part 2H applied to the index seal part 1i and the adhesive part 2L applied to the check seal part 1c are different.
The adhesive portion 2Hi of the index seal portion 1i has a relatively strong adhesive force to achieve the use as an index seal, and the adhesive portion 2Lc of one check seal portion 1c achieves the detachability required for the index seal. It is considered to have relatively weak adhesive strength.
That is, the adhesive portion 2Hi of the index seal portion 1i is composed of a relatively strong strong adhesive portion 2H, and the adhesive portion 2Lc of the check seal portion 1c is composed of a weak adhesive portion 2L having a relatively weak adhesive force.
The adhesive strength of the weak adhesive portion 2L and the strong adhesive portion 2H is 2 to 10 N / 50 mm, 15 to 15 mm when the adherend is an SUS plate by measuring the 180-degree peeling adhesive strength in 10 of JIS Z 0237. 60 N / 50 mm is preferable, and 3 to 8 N / 50 mm and 20 to 40 N / 50 mm are more preferable.

On the other hand, the seal product X1 of the present embodiment is configured to have portions with different adhesion forces as described above, and moreover, characteristically, the seal product X1 is configured so that the amount of residue in the dissociation test is less than 50 mg. Yes. More preferably, the total disaggregation should be configured.
By making the amount of residue as a whole of the seal product less than 50 mg, recycling becomes easy.
Furthermore, if it is made completely dissociable, it is possible to make it possible to collect used paper without sorting even if a seal product is bound in a magazine or catalog. The total dissociation property means that all of the base paper, release paper, and adhesive constituting the seal product are contained in a weak alkaline solution (0.025 wt% sodium hydroxide solution) used in the used paper processing process of a paper manufacturer. ) Completely dissociate.

Here, the dissociation test will be described. The dissociation test in the present invention is a test performed according to the following items (1) to (4).
(1) Preparation of sample: The seal product is cut to 30 mm × 30 mm ± 3 mm without peeling the release paper, 5.00 g ± 0.05 g is weighed, and fine paper (weighing 64 g) is 30 mm × 30 mm ± 3 mm. The test sample is combined with 45.00 g ± 0.05 g of the test piece. Each sample is adjusted in the standard state of JIS P 8111 (temperature 23 ° C. ± 1 ° C., humidity 50% ± 2%), and both the seal product and the quality paper are kept in the standard state for 12 hours or more. The above-mentioned high-quality paper is 50.00 g ± 0.05 g, and the one having almost no residue on the screen plate when the same operation as in this test is performed is used.
(2) Test equipment used: Use the standard disintegrator specified in JIS P 8220 Annex A. The flat screen uses a commercially available test flat screen and screen plate. The size of the screen box is 254mm x 304mm, the height is 220mm, and it has a structure that adjusts and maintains the water level in the screen box to 100mm by adjusting the gate. The diaphragm that vibrates up and down 3.2mm from 690 to 700 times per minute Use a vibrating screen under the screen plate. For the screen plate, use the 6-cut screen plate attached to the testing machine. Use clear water such as well water and tap water. As the alkaline solution, a solution prepared by dissolving 50.0 g of sodium hydroxide to 1000 ml is used.
(3) Test operation: First, 10 ml ± 1 ml of an alkaline solution is added to 2000 ml ± 10 ml of water at 30 ° C. ± 2 ° C., and placed in a disaggregation tank of a standard dissociator. Immediately add the sample, cover the disaggregation tank, start the disintegrator rotation, continue the disintegrator rotation for 20 minutes ± 5 seconds, and then stop the rotation.
Next, a specified screen plate is set on the flat screen, adjusted to have a specified water level and a water flow rate of 10 liters per minute, and then the clean is started, and the disaggregated sample slurry is put into the screen. Thoroughly clean the disaggregation tank and add the washing solution into the screen.
Next, the screen vibration and water flow are continued for 7 minutes ± 10 seconds from the first addition of the sample slurry, and then the water flow and vibration are stopped, the waste water tap of the screen is opened, and the residue remaining in the screen tank is screened. Collect on a plate. The residue remaining on the tank wall should be collected on the screen using the water flow of the washing bottle, and use of a large amount of water such as tap water is not preferable.
Next, the residue on the screen plate is collected using a safety razor blade, collected in an aluminum wheel cup that has been dried and weighed in advance, and the aluminum wheel cup is kept constant in a dryer adjusted to 105 ° C. ± 5 ° C. Dry and weigh until In general, 2 hours is sufficient for the drying time if a warm-air circulating thermostat is used.
After drying, the weight of the aluminum wheel cup is weighed to the nearest 1 mg.
The above operation is repeated for three sets of samples.
(4) Calculation: The amount of residue is expressed in units of 1 mg by subtracting the dry weight of the aluminum wheel cup measured in advance from the weight of the aluminum wheel cup containing the sample.

  On the other hand, in the seal product X1 of the present embodiment, in order to achieve the residual amount and the total dissociation property in the above dissociation test, hydrolyzate is used as an adhesive for forming the adhesive parts of the weak adhesive part 2L and the strong adhesive part 2H. Or pressure sensitive adhesives exhibiting alkali dissociation properties, particularly total disaggregation properties. In general, the adhesive cannot be used because it is not completely dispersed in the weak alkaline solution and remains in a lump. The pressure-sensitive adhesive exhibiting water-disintegrating property, alkali dissociating property, and total disintegrating property is not necessarily limited, but in particular, (a) having 4 carbon atoms in terms of ensuring adhesive strength that can be used as a seal product and dissociating property. 50 to 90% by weight of (meth) acrylic acid alkyl ester having ˜12 alkyl groups, (b) 5 to 45% by weight of alkoxyalkyl (meth) acrylate, and (c) 5 to 15% by weight of (meth) acrylic acid , And (d) with respect to the aqueous dispersion of the copolymer obtained by emulsion polymerization of 0 to 30% by weight of other copolymerization monomers in the presence of a basic phosphate, It is preferable to use a pressure-sensitive adhesive composition obtained by adding a tertiary amino alcohol having a boiling point of about 220 ° C. or more in an amount corresponding to 50 to 120 mol% of the carboxyl group. Furthermore, 5 to 40 parts by weight of nonionic surfactant having an HLB of 9 to 18 and 0.2 to 3 parts by weight of fatty acid soap per 100 parts by weight of the copolymer comprising (a) to (d). The pressure-sensitive adhesive composition is preferably added.

  As the (meth) acrylic acid alkyl ester having an alkyl group having 4 to 12 carbon atoms in the component (a), butyl (meth) acrylate, octyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, Examples thereof include isononyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate, and the like. This component (a) is a component that gives adhesive strength and internal cohesive strength, and it is necessary that it be contained in the adhesive at least 50% by weight. Examples of the (b) component alkoxyalkyl (meth) acrylate include methoxyethyl (meth) acrylate, methoxypropyl (meth) acrylate, ethoxyethyl (meth) acrylate, ethoxypropyl (meth) acrylate, and the like. It is done. The component (c) (meth) acrylic acid acts to neutralize the carboxyl group with a tertiary amino alcohol to impart water disintegrating properties to the pressure-sensitive adhesive, and at least 5% by weight is necessary. (D) Other copolymerizable monomers of component include methyl (meth) acrylate, ethyl (meth) acrylate, vinyl acetate, styrene, caprolactone adduct of (meth) acrylic acid, ethylene oxide of (meth) acrylic acid Examples include adducts, (meth) acrylonitrile, (meth) acrylamide and the like. As for the pressure-sensitive adhesive, pressure-sensitive adhesives having high disaggregation properties and different adhesive strengths may be mixed, and various non-adhesive substances may be mixed in order to control the pressure-sensitive adhesive strength of the pressure-sensitive adhesive. For example, non-tacky substances such as inorganic / organic pigments, waxes, adhesives and the like that do not inhibit the total disaggregation property can be mixed as appropriate to adjust the adhesive strength.

In forming the plurality of adhesive portions 2H and 2L having different adhesive strengths, for example, an appropriate plurality of adhesives having different adhesive strengths are selected from the above-mentioned dissociative adhesives, and these are selected as adhesive groups. This can be achieved by placing the base paper 1 at a desired position on the paper base.
Although not shown in the figure, after applying one type of adhesive to the base paper 1, it is applied and printed with a paste-killing agent or a release agent on the base paper 1 by a method such as halftone printing. You may make it suppress force suitably.

Various known coating machines such as an air knife coater, a roll coater, a blade coater, a rod metering coater, a comma coater, and a curtain coater can be used for coating the adhesive. When printing an adhesive, various known printing machines such as a relief printing machine, a gravure printing machine (intaglio printing machine), a screen printing machine, and an offset printing machine can be used.
When a printing machine is used, the thickness of the pressure-sensitive adhesive layer is particularly uniform. In addition, the method using a printing machine has the advantage that the type, amount, and distribution of adhesive (parts forming the adhesive layer 2) can be easily and quickly changed by pattern printing, solid printing, or the like. There is also. Furthermore, if a printing machine capable of printing and forming the weak adhesive part 2L and the strong adhesive part 2H in one pass is used, the production speed is improved.
Although the thickness of each adhesive part 2H and 2L is not specifically limited, It is suitable that there is no difference in both. Both are usually 5 to 50 μm, preferably 10 to 30 μm. The basis weight of the adhesive part can be appropriately changed depending on the type of the adhesive used, but is 5 to 50 g / m ² , preferably 10 to 30 g / m ² in terms of solid content.

The paste-killing agent used in the case of using the paste-killing layer is not particularly limited, but it is preferable to avoid those that react with water or alkali to form lumps. It becomes difficult to make the amount of residue less than 50 mg. Examples of the paste killing agent that can be used include, for example, printing inks and varnishes that are generally used as raw material components.
The formation method of the paste-killing layer is not particularly limited, and can be performed by coating, printing, etc., as with the pressure-sensitive adhesive layer. However, the paste-killing layer is formed on the surface of the release paper 3 and the paste-killing layer is formed on the back surface of the pressure-sensitive adhesive layers 2L and 2H as the release paper is bonded to the back surface of the pressure-sensitive adhesive layers 2L and 2H. It can also be in the form of transition and formation.

On the other hand, the base paper 1 before application of the pressure-sensitive adhesive serving as the base of the pressure-sensitive adhesive base paper is not particularly limited, but those exhibiting water decomposability and alkali dissociation excellent in reusability are used.
Kraft paper, fine paper, glassine paper, parchment paper, rayon paper, coated paper, and the like can be used. Various recycled papers may be used from the viewpoint of environmental protection. It is better to avoid paper with laminated resin film. It becomes difficult to make the amount of residue less than 50 mg.
The size, shape, thickness, basis weight, etc. of the base paper 1 are not particularly limited. The shape can be, for example, a circular shape, a square shape, an arbitrary shape, or the like. Further, the thickness is usually 30 to 250 μm, preferably 50 to 150 μm, if it is fine paper. Furthermore, basic weight can be 30-200 g / m < ² > normally, Preferably it can be 50-120 g / m < ² >.

On the other hand, the material of the release paper 3 that covers the pressure-sensitive adhesive layer forming surface of the pressure-sensitive adhesive base paper is obtained by applying a release agent or the like to the upper surface (surface) of paper, fabric, or the like, that is, the surface on the pressure-sensitive adhesive layer side. What gave the peeling process is suitable. It is better not to use a plastic film or the like that does not show water-disintegration property or alkali dissociation property. It becomes difficult to make the amount of residue less than 50 mg.
As a component of the release agent, known materials can be used, but those that react with water or alkali to form a lump should be avoided. It becomes difficult to make the amount of residue less than 50 mg. Examples of the releasing agent that can be used include silicone, long-chain alkyl polymer, polyolefin, alkyd resin, and fluorine compound.
As a method for applying the release agent, coating by various conventional coating machines such as an air knife coater, a blade coater, a rod metering coater, a curtain coater, and a roll coater can be employed. More preferably, it is printing coating by various printing such as offset printing, gravure printing (intaglio printing), letterpress printing, etc., in which it is easy to appropriately adjust the application amount and distribution of the release agent by pattern printing or solid printing.
The basis weight of the release agent can be appropriately changed depending on the type of the release agent to be used, but is usually 0.1 to 10 g / m ² in terms of solid content.
Further, the thickness of the release paper 3 is not particularly limited, and is usually 30 to 150 μm, preferably 40 to 100 μm.

“Second Embodiment”
The second embodiment is an information concealment sheet used for a concealed postcard or the like used for mailing in a state where confidential information or the like is concealed.
FIG. 3 is a front view of the information concealment sheet X2 of the present embodiment. FIG. 4 is a sectional view taken along the line IV-IV.

This information concealment sheet X2 is mainly composed of an adhesive base paper having an adhesive layer 12 disposed on one surface of the base paper 11, and a release paper 13 covering the adhesive layer forming surface.
The release paper 13 has the same shape and the same size as the adhesive base paper, and is bonded to the adhesive base paper without protruding from the periphery of the adhesive base paper.
The pressure-sensitive adhesive layer 12 includes a weakly-adhesive portion 12L having an adhesive strength that allows the release paper 13 to be peeled from the adhesive base paper, and a strong-adhesive portion 12H having an adhesive strength that does not peel.
The strong adhesive portion 12H is disposed on one side of the left and right half of the base paper 11, and the weak adhesive portion 12L is disposed on the other side.

The release paper 13 has a cutting auxiliary line L formed by a perforation, a slit, or the like at a boundary position between the weak adhesive portion 12L and the strong adhesive portion 12H. It is possible to separate and remove only the part in contact with the weak adhesive part 12L, leaving only the part in contact with the part 12H.
On the other hand, the weak adhesive portion 12L has different adhesive strength between the peripheral edge portion 12Le and the central portion 12Lc, and in particular, the central portion 12Lc has an adhesive strength having so-called removability.
Suitable adhesive strength of each adhesive part is 15 to 60 N / 50 mm, preferably 20 to 40 N / 50 mm at the peripheral part of the strong adhesive part and the weak adhesive part, preferably 2 to 10 N / 50 mm at the central part of the weak adhesive part, preferably It is about 3 to 8 N / 50 mm.

On the other hand, the information concealment sheet X2 is also configured to have portions having different adhesive forces as described above, and moreover, characteristically, the information concealment sheet X2 is configured such that the amount of residue in the dissociation test is less than 50 mg. Yes. More preferably, the total disaggregation should be configured.
By making the amount of residue of the information concealment sheet X2 as a whole less than 50 mg, recycling becomes easy. Furthermore, if the paper is completely dissociable, it becomes possible to collect recovered paper without sorting. Note that the total dissociation property means that the base paper, release paper, and adhesive constituting the information hiding sheet X2 are all contained in a weak alkaline solution (0.025% by weight hydroxylation) used in the waste paper processing process of the paper manufacturer. Complete dissociation with sodium solution).

Here, the type of pressure-sensitive adhesive that can be used to form the pressure-sensitive adhesive part, the method of forming a plurality of pressure-sensitive adhesive parts having different adhesive forces, the material of the release paper and the method of imparting peelability, the material of the base paper, and the dissociation property The test method is the same as in the first embodiment.
If the information concealment sheet X2 of this embodiment is used as a concealment type postcard, the basis weight of the base paper is 70 to 200 g / m ² and the basis weight of the release paper is 30 to 150 g / m ^2. Moreover, the basis weight of the pressure-sensitive adhesive layer is preferably 10-30.

On the other hand, a concealment information entry portion 13A is formed in the remaining portion of the release paper 13 that is in contact with the strong adhesive portion 12H. The concealment information entry unit 13A is, for example, a character / frame for designating a location where concealment information such as confidential information or information related to a financial institution is described. Appropriate frame lines, characters, Printed with graphics.
Further, at the edge of the remaining portion of the release paper 13, an easily peelable portion 13 </ b> H that is partially peeled off easily is formed by arranging two adjacent parallel slit lines 13 s and 13 s.

In the method of using the information concealment sheet X2 of this embodiment having such a configuration, first, information is printed and printed at appropriate locations such as the concealment information entry part 13A of the information concealment sheet X2 by a printer or the like.
When the necessary information has been printed and printed by a printer or the like, as shown in FIGS. 5 and 6, the portion of the release paper 13 in contact with the weak adhesive portion 12L is peeled off while being cut along the auxiliary cutting line L, and separated and removed. Then, the weak adhesive portion 12L is exposed.
Next, as shown in a cross-sectional view in FIG. 7, the exposed weak adhesive portion 12 </ b> L is folded and superimposed on the remaining portion of the release paper 13 to adhere the remaining portion of the release paper 13 and the weak adhesive portion 12 </ b> L.
At this time, the central portion of the weakly adhesive portion 12L is adhered so as to be removable. At the same time, the concealment information entry part 13A is covered and concealed.
Later, when reading the concealment information entered in the concealment information entry part 13A, the weak adhesive part is peeled off again from the release paper. As shown in FIGS. 8 and 9, the easy-peeling portion 13 </ b> H of the release paper 13 is adhered to the periphery of the weak adhesive portion and delaminated to form a release mark 16 on the release paper 13.

“Third embodiment”
The third embodiment is a continuous form type information recording adhesive sheet.
10 to 12 show an information recording adhesive sheet X3 of this embodiment.
The information recording pressure-sensitive adhesive sheet X3 includes a base paper 21 on which information is recorded on the front surface, a pressure-sensitive adhesive layer 22 for attaching the base paper 21 provided on the back surface of the base paper 21 to an adherend, and the pressure-sensitive adhesive. Mainly the release paper 23 covering the back surface of the layer 22.

In this embodiment, the base paper 21 has a horizontally long rectangular shape. A cutting auxiliary line L1 including a perforation line, a half slit line, and the like is formed in the center in the width direction of the base paper 21 along the front-rear direction. By this cutting auxiliary line L1, one is divided into a non-peelable piece 21A and the other is divided into a shipping deduction piece 21B.
Moreover, the cutting auxiliary line L2 which consists of a perforation line, a half slit line, etc. is formed in the horizontally long rectangular shape in the center part of 21 A of non-peelable pieces. By the cutting auxiliary line L2, the inner side is partitioned into a peelable piece 21a and the outer side is partitioned into a non-peelable piece 21a ′.

Personal information 25 such as an address is recorded on the peelable piece 21a, information such as a shipping note (not shown) is recorded on the shipping piece 21B, and other information (not shown) is recorded on the non-peelable piece 21A. The recording method is not particularly limited, and can be performed by a printing machine such as impact print, particularly by laser printing in recent years.
Note that auxiliary cutting lines L3 and L3 made of perforation lines, half slit lines, and the like are also formed along the front-rear direction at both ends of the base paper 21 in the width direction. A side of each auxiliary cutting line L3 is a marginal piece 24. Each marginal piece 24 is formed with a plurality of perfectly circular marginal holes 24A, 24A. Thus, this information recording adhesive sheet 3 is a continuous form type.

On the other hand, the pressure-sensitive adhesive layer 22 is provided on both the back surface of the peelable piece 21a and the back surface of the non-peelable piece 21a ′. The adhesive layer 22L on the back surface of the peelable piece 21a has a relatively weak adhesive force, and the adhesive layer 22H on the back surface of the non-peelable piece 21a ′ has a relatively strong adhesive force.
Since the adhesive layer 22L on the back surface of the peelable piece 21a has a relatively weak adhesive force, the peelable piece 21a can be peeled from the adherend 100. Moreover, even if the adhesive force is relatively weak, the adhesive layer 22L is still provided.
Therefore, the peelable piece 21a (base paper 21) and the release paper 23 are not separated and air does not enter between the sheets 21A (21), 23, and the recording property is excellent.
Further, since the adhesive layer 22H on the back surface of the non-peelable piece 21a ′ around the peelable piece 21a has a relatively strong adhesive force, the non-peelable piece 21a ′ is substantially separated from the adherend 100. Unpeelable. Therefore, there is no fear that the peelable piece 21a surrounded by the non-peelable piece 21a ′ will be peeled off during transportation.

In this embodiment, the adhesive layer is not provided on the back surface of the shipping strip 21B. This is because the shipping coupon 21B is stored as it is without being attached to the adherend 100 by being cut by the auxiliary cutting line L1 after the information such as the shipping coupon is recorded. However, from the viewpoint of improving printability, a pressure-sensitive adhesive layer can be appropriately provided on the back surface of the shipping strip 21B.
In the present embodiment, how the adhesive layer 22L on the back surface of the peelable piece 21a has a relatively weak adhesive force is not particularly limited. For example, the adhesive force can be made relatively weak by forming the adhesive layer 22L with an adhesive having a relatively weak adhesive force.

On the other hand, the information recording pressure-sensitive adhesive sheet X3 is also configured to have portions having different adhesive forces as described above, and moreover, characteristically, the amount of residue in the dissociation test is configured to be less than 50 mg. Has been. More preferably, the total disaggregation should be configured.
By making the amount of residue of the information recording adhesive sheet X3 as a whole less than 50 mg, recycling becomes easy. Furthermore, if the paper is completely dissociable, it becomes possible to collect recovered paper without sorting. The total dissociation property means that all of the base paper, release paper, and adhesive constituting the information recording pressure-sensitive adhesive sheet X3 are contained in a weak alkaline solution (0.025% by weight) used in the waste paper processing process of a paper manufacturer. Complete dissociation with sodium hydroxide solution).
Types of pressure-sensitive adhesives that can be used to form pressure-sensitive adhesive parts, methods for forming a plurality of pressure-sensitive adhesive parts having different adhesive forces, release paper materials, methods for imparting peelability, base paper materials, etc., and dissociation test methods Is the same as in the first embodiment.

On the other hand, the method of using the information recording adhesive sheet X3 of the present embodiment is as follows. First, as shown in FIG. 12, the release paper 23 is peeled to expose the adhesive layer 22, and the adhesive layer 22 is used to form a base. The paper 21 is attached to an adherend 100 such as a cardboard box.
In this state, the consignee or the like who has received the transported goods or the like peels off the peelable piece 21 a of the base paper 21 from the adherend 100 when discarding the adherend 100.
Since the information recording adhesive sheet X3 of the present embodiment can perform this work very easily, the consignee or the like can discard the adherend and the peelable piece 21a on which personal information 25 such as the address is recorded. Can be peeled off from the adherend to enjoy the merit of preventing leakage of personal information.
On the other hand, in the case where the peelable piece 21a has a substantially rectangular shape such as a rectangular shape as in the present embodiment, it is preferable that one of the corners 49 has a cut corner. By inserting a finger or a protrusion into the corner cut corner 49, the peelable piece 21a can be easily peeled off.

  The present invention includes a tack seal that adheres to an adherend, a concealed postcard for filling in information that is not desired to be known to unspecified persons, such as confidential information and credit card numbers, and mailing it to a specific institution or company. It can be used for a salary statement etc. handed over to the payee.

It is a top view of the seal product of a 1st embodiment. It is the II-II sectional view. It is a top view of the information hiding sheet of a 2nd embodiment. It is the IV-IV sectional view. It is a 1st top view for demonstrating the usage condition of the information concealment sheet. It is the VI-VI sectional view. It is sectional drawing for demonstrating the usage condition of the information concealment sheet. It is a 2nd top view for demonstrating the usage condition of the information concealment sheet. It is the IX-IX sectional view. It is a top view of the adhesive sheet for information recording of 3rd Embodiment. It is the AA sectional view. It is sectional drawing for demonstrating the usage method.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 11, 21 ... Base paper, 1i ... Index seal part, 1c ... Check seal part, 2, 12, 22 ... Adhesive layer (adhesive layer), 2L, 2Li, 12L, 22L ... Weak adhesive part, 2H, 2Hi, 12H, 22H ... strong adhesive part, 21a ... peelable piece, 21a '... non-peelable piece, L to L3, 13s ... cutting auxiliary line, slit wire, 49 ... corner cut corner, X1 ... seal product, X2 ... Information hiding sheet, X3... Information recording adhesive sheet.

Claims (6)

An adhesive base paper having a plurality of adhesive portions with different adhesive forces on one or both sides;
A release sheet that covers the adhesive portion, and an adhesive sheet comprising:
The amount of residue in the dissociation test is less than 50 mg.
A pressure-sensitive adhesive sheet.   The pressure-sensitive adhesive sheet according to claim 1, wherein the pressure-sensitive adhesive sheet is fully dissociable.   The pressure-sensitive adhesive sheet according to claim 1 or 2, wherein the pressure-sensitive adhesive portions having different pressure-sensitive adhesive forces are formed of pressure-sensitive adhesives having different pressure-sensitive adhesive forces.   The pressure-sensitive adhesive sheet according to any one of claims 1 to 3, wherein a part or all of the pressure-sensitive adhesive part is formed by paste-killing the pressure-sensitive adhesive layer.   The pressure-sensitive adhesive sheet according to any one of claims 1 to 4, wherein a release paper having a partial peeling function is used.   On one side of a water-decomposable or alkali-dissociable base paper, a fully-decomposable adhesive is applied, applied or printed in a preset pattern to form an adhesive part, and then the adhesive part is hydrolysable or alkali-dissociated. A method for producing a pressure-sensitive adhesive sheet, characterized by covering with an adhesive release paper.

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