JPH10207375A - Recording media for label - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide recording media for the label with which 'releasing easiness of release paper', 'working easiness of the label sheet', 'prevention of cock ring and curl' and 'prevention of adhesive agent spread' is enabled. SOLUTION: Concerning recording media 1 for the label composed of a main body 15 of the label having an ink receiving layer 13 on the front side of base material 10 and having an adhesive layer 12 on its rear side and a base sheet 11 provided while covering the adhesive layer 12 so as to be released from the main body 15 of the label and its feature is that thickness t2 of base sheet 11 is made thicker than thickness t1 of the main body 15 of the label. Then, it is preferable that both the edge parts of main body 15 of the label and the base sheet 11 are bonded in the state of coincidence, the base material 10 and the base sheet 11 are composed of synthetic resin and have the different degrees of transparency, or the quantity of adhesive layer 12 to be applied is suppressed less than specified quantity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a label recording medium, and more particularly to a label recording medium for ink jet recording, which has a release paper on the back side.

[0002]

2. Description of the Related Art A label recording medium having a release paper on the back side is a medium for peeling off the release paper and sticking it to a desired location for use, and has been commercially available as a label sheet for ink jet recording. ing.

[0003] Since it is necessary to peel off the release paper at the time of use, this label sheet is required to be easily peelable (easy peeling property). However, in the conventional label sheet, the base material and the release paper have the same dimensions and the same shape, and the release paper is in close contact with the adhesive layer (adhesive layer), so that the release paper can be easily peeled off. I couldn't do that.

In order to solve this problem, as shown in FIG. 2, a label sheet 22 having a release paper 21 larger than a base material 20 is used.
(See Japanese Utility Model Laid-Open No. 3-36471 and Japanese Patent Laid-Open No. 1-53793). That is, the label sheet 22 disclosed in these publications, when separating the base material 20 and the release paper 21,
Since the protruding portion 23 of the release paper 21 protruding from the portion 20 can be picked with a finger, the operation for starting the peeling can be facilitated.

[0005]

In the conventional label sheet 22 shown in FIG. 2, the release paper 21 can be easily peeled off, but the base material 20 and the release paper 21 have the same dimensions and the same shape. Instead, processing of the label sheet 22
There was a problem that (manufacturing) was difficult.

On the other hand, in the conventional label sheet, when an image or the like is formed on the ink receiving layer provided on the front side of the base material by an ink jet method, since the release paper has a hygroscopic property, cockling (wave is generated). Which is a phenomenon that occurs and presents an uneven shape). In addition, after printing by an ink jet method or the like, a so-called "curl" occurs in which the label sheet warps in a specific direction, so that it becomes difficult to pick up the end of the label sheet with a finger, so that the label sheet is separated from the base material. There have been problems such as difficulty in peeling off from paper and poor handling.

[0007] Further, the label sheet can enhance its sticking function by increasing the thickness of an adhesive layer formed on the back surface of the base material. In this case, the adhesive on which the adhesive layer is formed cannot be used. The "adhesive sticking out" exposed between the base material and the release paper transfers the adhesive during image formation,
There have been problems such as soiling of the image forming apparatus (printing apparatus) and jamming of the sheet itself.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and aims at "easy peeling of release paper", "easy processability of label sheet", "cockling and capping". It is an object of the present invention to provide a label recording medium which enables "prevention of sticking" and "prevention of sticking out of adhesive".

[0009]

According to the present invention, there is provided a label recording medium comprising: a base sheet corresponding to a release paper having a thickness greater than a thickness of the label body; The thickness of the base sheet is less than the thickness of the label body.
1.1 to 6.0 times (Claim 2) ・ The label body and the base sheet are made to have the same dimensions and the same shape so that the edges of the base sheet coincide (Claim 3). The coating amount of the adhesive layer provided on the label body is set to 20 g / m ² or less (Claim 4) .A synthetic resin film is used as a base material of the label body and the base sheet. Further, the base material and the base sheet have different degrees of transparency (Claim 5). The label recording medium is used for ink jet recording (Claim 6). In addition, the present invention provides a label recording medium as described above.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to FIG. FIG. 1 is a sectional view of a label recording medium according to an embodiment of the present invention.

As shown in FIG. 1, a label recording medium 1 according to the present invention has a label body 15 having an ink receiving layer 13 on the front side of a base material 10 and an adhesive layer 12 on the back side thereof,
And a base provided so as to be peelable from the label body 15.
And sheet 11. The feature of the present invention is that the thickness (t2) of the base sheet 11 is larger than the thickness (t1) of the label body 15.

The above feature of the present invention will be described in more detail. In the label recording medium 1, the thickness (t2) of the base sheet 11 is larger than the thickness (t1) of the label body 15.
It is preferably 1.1 to 6.0 times, more preferably 1.2 times
~ 3.0 times. If the thickness (t2) of the base sheet 11 is less than 1.1 times, the rigidity of the base sheet 11 does not become apparent with respect to the label body 15, and the label body 15 side Not only is the base sheet 11 warped, but also the peeling operation becomes unstable, making it difficult to peel, which is not preferable. On the other hand, if the thickness (t2) of the base sheet 11 exceeds 6.0 times, the total thickness of the label recording medium 1 becomes too large, and when the label recording medium 1 passes through the inside of the image forming apparatus, there is a paper feeding failure or paper feeding. It is not preferable because the accuracy of the paper is lowered and the paper passing property is deteriorated.

[0013] A label recording medium according to the present invention.
1, the label body 15 and the base sheet 11 may be configured to have the same dimensions and the same shape so that the edges of the label body 15 and the base sheet 11 coincide. In this case, cutting and punching can be performed at a time in a state where the label body 15 and the base sheet 11 are superimposed on each other, and the positioning is easy even when the two are pasted after measuring, and the workability is improved. Is good.

In the label recording medium 1 according to the present invention, it is preferable to use a synthetic resin film as a material of the base material 10 and the base sheet 11. The reason is that neither the base material nor the base sheet has a hygroscopic property.
This is because the cockling and the curl described above can be prevented.

The material of the synthetic resin film is as follows:
Polyester, polyolefin, polyamide, polyesteramide, polyether, polyimide, polyamideimide, polystyrene, polycarbonate, poly-ρ-phenylene sulfide, polyether ester, polyvinyl chloride, and poly (meth) acrylate are preferred. In addition, these copolymers and blends, and further, crosslinked products can be used.

As the polyester film, a film which is whitened by adding white inorganic particles to the polyester can also be used. The white inorganic particles are known inorganic particles having almost no coloration, such as calcium carbonate, amorphous zeolite particles, anatase type titanium dioxide, calcium phosphate, calcium sulfate, barium sulfate, silica, alumina, kaolin, talc, clay and the like. Is mentioned. In addition to such inorganic particles, fine particles precipitated by a reaction between a catalyst residue and a phosphorus compound in a polyester polymerization reaction system can also be used.

Further, it is also possible to use a film in which fine bubbles are contained inside the film and whitened by scattering light with the bubbles. Since the use of such a film has fine bubbles, the specific gravity is low, and
Since it also has cushioning properties, there is an advantage that a clear image can be obtained.

As means for forming fine air bubbles, an immiscible polymer,
For example, poly-3-methylbutene-1, poly-4-methylpentene
1, polypropylene, polyvinyl-t-butane, 1,4-trans-poly-2,3-dimethylbutadiene, cellulose triacetate, cellulose tripropionate, polychlorotrifluoroethylene, etc., are finely dispersed, or the white inorganic Add particles and make them uniaxial or 2
It can be formed by stretching to an axis. During this stretching, voids (bubbles) are formed around the dispersed incompatible polymer particles or the added white inorganic particles,
This exerts a light scattering action and is whitened.

As the polyester film, a film which has been subjected to a surface treatment by a known method, for example, a film which has been subjected to a corona discharge treatment (in air, in nitrogen, in carbon dioxide gas, etc.) or an easy adhesion treatment is used. In this case, or when a film obtained by applying the various adhesives described below to the film after uniaxial or biaxial stretching is used, adhesion to the recording layer, water resistance, solvent resistance, and the like are improved, which is more preferable.
In addition, various methods known in the art can be used for the easy adhesion treatment, and acrylic, urethane,
Those coated with various adhesives such as polyesters can be suitably used.

Further, in the present invention, it is preferable that the base material 10 and the base sheet 11 have different transparency. For example, the base material 10 can be made transparent, and the base sheet 11 can be made white.
The sheet 11 can be transparent. In this way, by adopting a configuration having different degrees of transparency, the base material 10 and the base material are different.
It is easy to visually recognize the sheet 11 and its handleability is improved. When this label recording medium 1 is loaded into, for example, an image forming apparatus for color ink jet recording, the discrimination between the front and back sides can be made. It has the advantage of being easy.

In the present invention, the base material 10, the base sheet 11
A transparent film or a colored film (including a white film) may be used, but as described above, a combination of the base material 10 and the base sheet 11 having different degrees of transparency is preferable. That is, when the base material 10 is transparent, a colored film is used for the base sheet 11, while when the base material 10 is a colored film, a transparent film is used for the base sheet 11. Is preferred. Thereby, in addition to the above-mentioned advantages, there is an advantage that the printing surface can be particularly specified.

As the transparent film, JIS-K6714
It is preferable that the haze value (quantity value) specified in the above is 10 or less and the total light transmittance is 80 or more. When using a white film as the colored film, JIS-P8123
The Hunter whiteness defined by or the ISO whiteness defined by JIS-P8148 is preferably 70 or more, and more preferably 80 or more.

In the present invention, as the base sheet 11,
It is preferable to use a material obtained by applying a release agent (silicone) to the transparent film or the colored film and subjecting it to a process that facilitates release. The thickness of the substrate 11 is not particularly limited, but is usually 10 to 500 μm, preferably 20 to 300 μm, and more preferably 30 to 250 μm.

In the present invention, the ink receiving layer 13 can be formed of a conventionally known material. That is, the ink receiving layer 13 is for appropriately absorbing and holding the ink droplets, and can be formed of a known material including a pigment, a binder resin, and other various additives.

As the pigment, silica, zeolite, calcium carbonate, diatomaceous earth, clay, talc, aluminum oxide, alumina hydroxide and the like can be used. As the binder resin, polyvinyl alcohol, polyvinylpyrrolidone, casein, gelatin, a copolymer of acrylate, polyacrylamide, polyethylene oxide, an ethylene-vinyl acetate copolymer, a cellulose derivative, and the like can be used. Additives include UV absorbers, preservatives, antioxidants, pH adjusters, surfactants,
An antifoaming agent or the like can be used in combination.

Further, Japanese Patent Application Laid-Open Nos. Hei 2-276670 and Hei 3-28
JP-A No. 1383 and JP-A-6-199035 disclose a "recording sheet in which an ink receiving layer having fine pores is formed using pseudo-boehmite-based fine particles". Can be used as the label recording medium 1 of the present invention.

In the present invention, the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 12 includes a low Tg main monomer component for imparting tackiness, a high Tg comonomer component for imparting adhesiveness and cohesive force, and crosslinking and adhesion improvement. For this purpose, a polymer or copolymer mainly containing a functional group-containing monomer component or the like can be used, and a cross-linking agent can be added to a solution of the polymer or copolymer for use.

The main monomer components include ethyl acrylate, butyl acrylate, amyl acrylate, and acrylic acid.
Alkyl acrylates such as 2-ethylhexyl, octyl acrylate, cyclohexyl acrylate, benzyl acrylate, butyl methacrylate, methacrylic acid
Alkyl methacrylates such as 2-ethylhexyl, cyclohexyl methacrylate, and benzyl methacrylate can be used.

As the comonomer component, methyl acrylate, methyl methacrylate, ethyl methacrylate, vinyl acetate, styrene, acrylonitrile and the like can be used. As the functional group-containing monomer component, acrylic acid, methacrylic acid, maleic acid and the like can be used. Carboxyl-containing monomers such as acid, itaconic acid and crotonic acid, and hydroxyl-containing monomers such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate and N-methylolacrylamide, acrylamide, methacrylamide and glycidyl methacrylate Etc. can be used.

In the present invention, as a pressure-sensitive adhesive, a crosslinking agent is added to a solution of the above-mentioned polymer or copolymer, and the crosslinking agent is used.
What is necessary is just to select and add a type of crosslinking agent that can react with a functional group, such as an ethyleneimine type or an aluminum chelate type.

In the present invention, the coating amount (dry weight) of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 12 may be within a range of 20 g / m ² or less, and more preferably, 15 g / m ^2. Extrusion of the agent can be further reduced.

[0032]

Next, examples of the present invention will be described together with comparative examples.
The label recording medium according to the present invention will be specifically described. In describing the following examples and comparative examples, reference is made to FIG. 1 described above. That is, as shown in FIG. 1, the samples produced in each of the examples and comparative examples are composed of a label body 15 composed of an ink receiving layer 13, a base material 10, and an adhesive layer 12, and a base sheet 11. This is the label recording medium 1 to be used.

(Example 1) In Example 1, a commercially available OHP sheet for color ink jet recording (model number "MJOHPSIN", manufactured by Seiko Epson Corporation) was used. The base material 10 of this sheet is 100 μm transparent PET (polyethylene terephthalate).
The ink receiving layer 13 of μm is provided. On the other hand, as the base sheet 11, a white PET having a thickness (t2) of 188 μm and subjected to a silicon release treatment was used.

An acrylic pressure-sensitive adhesive was applied to the base sheet 11 with a bar coat to a concentration of 10 g / m ² to form a pressure-sensitive adhesive layer 12, which was then adhered to the back surface of the OHP sheet to prepare a sample (recording for label). Media 1) was prepared. In this sample, the thickness (t1) of the label body 15 is 140 μm (Note 1), while the thickness (t1) of the base sheet 11 is 188 μm.
m, the base sheet 11 is 1.34 times (Note 2) thicker than the label body 15. (Note 1): Thickness (t1) of label body 15 = 100 µm (base material 10) + 30 µm (ink receiving layer 13) + 10 µm (adhesive layer 12) = 140 µm (Note 2): Label body with base sheet 11 thickness (t2) 15 Magnification to thickness (t1) = (t2) / (t1) = 188 μm / 140 μm = 1.34

(Example 2) In Example 2, "38 μm white PET film" was used as the base material 10 for the label, and "75 μm
m transparent PET film "was used. Then, the ink receiving composition was applied at 10 g / m ² on the substrate 10 to form the ink receiving layer 13. On the other hand, an acrylic pressure-sensitive adhesive is applied on the base sheet 11 by bar coating to a concentration of 10 g / m ² to form a pressure-sensitive adhesive layer 12, which is adhered to the back surface of the base material 10 to obtain a sample (recording medium for label). 1) was prepared. In this sample, the thickness (t2) of the base sheet 11 (note
3) was approximately 1.3 times (Note 4) the thickness (t1) of the label body 15. (Note 3): Thickness (t1) of label body 15 = 38 µm (base material 10) + 10 µm (ink receiving layer 13) + 10 µm (adhesive layer 12) = 58 µm (Note 4): Label body with base sheet 11 thickness (t2) 15 Magnification to thickness (t1) = (t2) / (t1) = 75 μm / 58 μm = 1.29

Example 3 In Example 3, a sample was produced under the same conditions except that the base sheet 11 of Example 2 was changed to 100 μm. [In this case, the thickness (t2) of the base sheet 11 is 1.7 times (100 μm) the thickness (t1) of the label body 15.
m / 58 μm). ]

Example 4 In Example 4, a sample was produced under the same conditions except that the base sheet 11 of Example 2 was changed to 188 μm. [In this case, the thickness (t2) of the base sheet 11 is 3.2 times (188 μm) the thickness (t1) of the label body 15.
m / 58 μm). ]

Example 5 In Example 5, a sample was produced under the same conditions except that the base sheet 11 of Example 2 was changed to 200 μm. [In this case, the thickness (t2) of the base sheet 11 is 3.4 times the thickness (t1) of the label body 15 (200 μm).
m / 58 μm). ]

Comparative Example 1 As Comparative Example 1, the base sheet 11 was changed to 75 μm and the base material 10 was changed to 50 μm, and the other conditions were the same as those in Example 2. [In this case, base sheet 11
Is 1.07 times (75 times) the thickness (t1) of the label body 15.
μm / 70 μm). ]

Comparative Example 2 As Comparative Example 2, a commercially available glossy film (with glue) for an ink jet printer (manufactured by Kao Corporation) was used. In this film, the thickness of the base material 10 is 100 μm, the thickness of the ink receiving layer 13 is 36 μm, and the thickness of the adhesive layer 12 is 11 μm, while the thickness (t2) of the base sheet 11 is 39 μm. Therefore, the thickness (t2) of the base sheet 11 is 0.27 times (39 μm / 147 μm) the thickness (t1) of the label body 15.

With respect to the samples of Examples 1 to 5 and Comparative Examples 1 and 2, a test was conducted on the ease of peeling of the label body 15 and the base sheet 11. Table 1 shows the results. Table 1
As can be seen from the results, in Examples 1 to 5 of the present invention, a result that was easy to peel was obtained as compared with Comparative Examples 1 and 2.

[0042]

[Table 1]

[0043]

According to the present invention, as described in detail above, by making the thickness of the base sheet corresponding to the release paper larger than the thickness of the label body, the base sheet can be easily removed from the label body. The label body and the base
Both parts must have the same dimensions, so that the edges of the sheet coincide.
With the same shape, the effect is obtained that the label recording medium according to the present invention can be easily processed (manufactured). Then, the label recording medium according to the present invention, the result of extremely easy peeling operation, the printing surface (image surface)
Since the peeling operation can be performed without touching the finger, the generation of stains on the printing surface at the time of peeling can be prevented. In particular, in the ink jet printing, there is a remarkable effect that "discoloration or deterioration of the printing surface due to oil can be avoided" due to contact of a finger (adhesion of a fingerprint) immediately after printing.

Further, the base material of the label body and the base sheet
By using a synthetic resin film as
This has the effect of preventing "the occurrence of cockling or curl due to the hygroscopicity of the release paper" in the conventional label sheet. Further, by setting the applied amount (dry weight) of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer to 20 g / m ² or less, an effect of preventing the pressure-sensitive adhesive from protruding is produced.

[Brief description of the drawings]

FIG. 1 is a sectional view of a label recording media sheet according to an embodiment of the present invention.

FIG. 2 is a plan view of a conventional label sheet.

[Description of Signs] 1 Recording medium for label (label sheet) 10 Base material 11 Base sheet 12 Adhesive layer 13 Ink receiving layer 15 Label body 20 Base material 21 Release paper

Claims (6)

[Claims] 1. A label body having an ink receiving layer on the front side of a base material and an adhesive layer on the back side, and a base sheet covering the adhesive layer and provided detachably from the label body. 2. The label recording medium according to claim 1, wherein the thickness of the base sheet is larger than the thickness of the label body. 2. The label recording medium according to claim 1, wherein the thickness of the base sheet is 1.1 to 6.0 times the thickness of the label body. 3. The label recording medium according to claim 1, wherein when the label main body and the base sheet are joined, all edges are coincident with each other. . 4. The label recording medium according to claim 1, wherein the amount of the adhesive layer applied is set to 20 g / m ² or less. 5. The label body according to claim 1, wherein said base material and said base sheet are made of a synthetic resin film, and said base material and said base sheet have different transparency. 5. The label recording medium according to any one of items 1 to 4. 6. The label recording medium according to claim 1, wherein the label recording medium is used for ink jet recording.