JP2010237698A - Liquid crystal label, liquid crystal label continuous body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal label which prevents forgery and swapping and is reliably produced in a simple manner. <P>SOLUTION: The liquid crystal label 20 includes a transparent base material 22. On the back side of the base material 22, a liquid crystal layer 24 composed of cholesteric liquid crystal is provided in a size smaller than the base material 22 so as not to extend to the periphery of the base material 22. On the back side of the base material 22, an adhesive layer 26 is prepared so as to cover the liquid crystal layer 24. A plurality of peeling cuts 28 are formed on the base material 22, the liquid crystal layer 24 and the adhesive layer 26 in such a manner so as to extend from the periphery of the base material 22 onto the liquid crystal layer 24. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a liquid crystal label, a liquid crystal label continuous body, and a method for producing a liquid crystal label continuous body, and in particular, includes a liquid crystal layer made of cholesteric liquid crystal and prevents forgery and re-sticking. The present invention relates to a liquid crystal label continuous body temporarily attached at intervals and a method for producing a liquid crystal label continuous body.

A liquid crystal label that prevents forgery and re-sticking is disclosed in International Publication No. 2004/032099. This liquid crystal label comprises a transparent or translucent substrate, a cholesteric liquid crystal, a liquid crystal layer formed on the back side of the substrate, and a background layer formed on the opposite side of the liquid crystal layer from the substrate The liquid crystal label includes an adhesive layer formed on the opposite side of the background layer from the liquid crystal layer. In addition, the liquid crystal label is configured such that the substrate peels off from the liquid crystal layer when it is peeled off from the article, or the liquid crystal layer cohesively breaks and a part of the liquid crystal layer peels off together with the substrate. It is configured. In this liquid crystal label, forgery can be prevented because a liquid crystal layer made of cholesteric liquid crystal is used. Furthermore, in this liquid crystal label, when it is to be peeled off from an article, a part of the liquid crystal layer is peeled off together with the base material or the base material, so that re-sticking can be prevented (see Patent Document 1).
If it is possible to prevent the liquid crystal label from being replaced in this way, the liquid crystal label can be peeled off from a genuine article and replaced with a fake article, and the fake can be prevented from being fake as a genuine article. It is possible to improve the accuracy of the authenticity of the article to which is attached.

International Publication No. 2004/032099 Pamphlet

In a liquid crystal label in which a liquid crystal layer made of cholesteric liquid crystal is provided on almost the entire back surface of a base material, such as the liquid crystal label disclosed in Patent Document 1, a plurality of the liquid crystal labels are provided at intervals on the surface of a strip-shaped release material. When manufacturing in a temporarily attached state, a belt-like laminate is formed by laminating a belt-like substrate, a liquid crystal layer, a background layer, an adhesive layer and a release material, and a predetermined layer is formed from the substrate to the adhesive layer on the laminate. A label-shaped die cut is performed, and so-called residue raising is performed in which unnecessary portions (cass) around the die cut are removed from the release material.
In this case, a liquid crystal layer composed of a relatively detachable cholesteric liquid crystal or a liquid crystal composed of a cholesteric liquid crystal that is relatively easy to coagulate and destroy not only in a portion that becomes a liquid crystal label but also in an unnecessary portion (cass) around the liquid crystal label. Since a layer is provided, when a relatively heavy peeling (releasing with a relatively strong force) release material is used, unnecessary parts around the liquid crystal label are removed from the release material and removed during so-called scrap raising. , A part of the base material of the unnecessary part is peeled off from the liquid crystal layer, or the liquid crystal layer of the unnecessary part is cohesive and destroyed, and a part of the base material and a part on the base material side of the liquid crystal layer are part of the liquid crystal layer. It may be peeled off from the cohesive failure part, and a part of the unnecessary liquid crystal layer or adhesive layer may remain around the liquid crystal label on the release material.
Therefore, there is a demand for a liquid crystal label that is free from forgery and re-sticking that can be easily and reliably manufactured without such a situation.
In addition, in the liquid crystal label adhered for a hard disk drive (HDD), it is required to reduce the amount of low molecular weight silicone as much as possible, and when the release surface of the release material is formed by a release agent with low low molecular weight silicone, Since the surface is relatively heavily peeled, the above problem is likely to occur.

Therefore, a main object of the present invention is to provide a liquid crystal label which can be easily and reliably manufactured and which is prevented from forgery and replacement.
Another object of the present invention is to provide a liquid crystal label continuum having a liquid crystal label, which can be easily and reliably manufactured and prevents forgery and re-sticking.
Still another object of the present invention is to provide a method for producing a liquid crystal label continuous body having a liquid crystal label, which can be easily and reliably produced and which prevents forgery and replacement.

The liquid crystal label according to the present invention comprises a base material having transparency, a liquid crystal layer made of cholesteric liquid crystal provided smaller than the base material so as not to reach the periphery of the base material on the back side of the base material, and a liquid crystal layer. An adhesive layer provided on the back surface side of the base material so as to cover, and is a liquid crystal label in which a break for peeling extending from the periphery of the base material to the liquid crystal layer is formed on the base material.
The liquid crystal label continuous body according to the present invention is a liquid crystal label continuous body having a strip-shaped release material and a plurality of liquid crystal labels according to the present invention temporarily attached to the surface of the release material at intervals.
The method for producing a liquid crystal label continuous body according to the present invention is a method for producing a liquid crystal label continuous body for producing the liquid crystal label continuous body according to the present invention. A liquid crystal layer made of cholesteric liquid crystal for a plurality of liquid crystal labels provided at intervals on the side, and a belt-like adhesive layer provided on the back side of the belt-like substrate so as to cover the liquid crystal layers for the plurality of liquid crystal labels And a step of forming a belt-like laminate including a belt-like release material temporarily attached to the surface of the belt-like adhesive layer opposite to the belt-like base material, and a belt-like laminate in the belt-like laminate A step of forming a label cut in a shape corresponding to the periphery of the liquid crystal label on the outside of the periphery of the liquid crystal layer for the plurality of liquid crystal labels from the substrate to the belt-like adhesive layer; In the base material A step of forming a release cut so as to extend from the peripheral portion of the crystal label onto the liquid crystal layer for the liquid crystal label, and the outer side of the label cut extending from the belt-like substrate to the belt-like adhesive layer in the belt-like laminate. And a step of peeling an unnecessary part from the strip-shaped release material.

In the liquid crystal label according to the present invention, the liquid crystal layer made of cholesteric liquid crystal is provided smaller than the base material so as not to reach the periphery of the base material on the back surface side of the base material, and the adhesive layer covers the liquid crystal layer. Provided on the back side. Therefore, when manufacturing a plurality of liquid crystal labels according to the present invention in a state where a plurality of temporary attachments are provided on the surface of the strip-shaped release material at intervals, it is not necessary to provide a liquid crystal layer around unnecessary portions around the liquid crystal labels. At the time of so-called scrap removal, which removes unnecessary unnecessary parts from the release material, only the unnecessary part of the base material is peeled off or the liquid crystal layer of the unnecessary part is cohesively broken in the part of the unnecessary part. Only a part of the layer is not peeled off, and an unnecessary part of the liquid crystal layer or adhesive layer is not left on the peeling material. Therefore, the liquid crystal label according to the present invention can be easily and reliably manufactured.
Further, in the liquid crystal label according to the present invention, since the liquid crystal layer made of cholesteric liquid crystal is used and the liquid crystal layer cannot be easily forged, forgery can be prevented.
Further, in the liquid crystal label according to the present invention, since the cut line for peeling extending from the periphery of the base material to the liquid crystal layer is formed on the base material, even if it is illegally peeled off after being attached to the adherend. The base material is peeled off from the liquid crystal layer while extending so as to extend the peeling cut, or the base material is broken so as to extend the peeling cut and the liquid crystal layer is coherently broken to peel off a part of the base material and the liquid crystal layer. Therefore, it can prevent that it is replaced.

  The above-described object, other objects, features, and advantages of the present invention will become more apparent from the following description of the best mode for carrying out the invention with reference to the drawings.

It is a top view solution figure which shows an example of the liquid crystal label continuous body concerning this invention. It is a cross-sectional solution figure of the liquid-crystal label continuous body shown in FIG. It is an illustration figure which shows the molecular arrangement | sequence of a cholesteric phase. FIG. 2 is an illustrative sectional view showing a laminate for producing the liquid crystal label continuous body shown in FIG. 1. FIG. 5 is an illustrative sectional view showing a step of forming a cut in the laminate shown in FIG. 4. It is a perspective view which shows the process of peeling an unnecessary part from the laminated body shown in FIG. FIG. 5 is a cross-sectional view illustrating a process of peeling an unnecessary portion from the stacked body illustrated in FIG. 4. It is a cross-sectional solution figure which shows the process of forming a cut | interruption in the laminated body for manufacturing a comparative example. It is a top-view solution figure which shows the other example of the liquid crystal label continuous body concerning this invention. FIG. 10 is an illustrative sectional view of the liquid crystal label continuum shown in FIG. 9. FIG. 10 is an illustrative sectional view showing a laminate for manufacturing the liquid crystal label continuous body shown in FIG. 9. FIG. 12 is an illustrative sectional view showing a step of forming a cut in the laminate shown in FIG. 11. FIG. 12 is an illustrative sectional view showing a step of peeling an unnecessary part from the laminate shown in FIG. 11.

  FIG. 1 is a schematic plan view showing an example of a liquid crystal label continuum according to the present invention, and FIG. 2 is a cross-sectional schematic view of the liquid crystal label continuum. A liquid crystal label continuous body 10 shown in FIG. 1 includes a strip-shaped release material 12. The release material 12 is formed, for example, by applying a release agent such as silicone to the surface of paper or the like. A plurality of liquid crystal labels 20, 20,... Are temporarily attached to the surface of the release material 12 so as to be separated at intervals.

  The liquid crystal label 20 includes, for example, an elliptical base 22 having transparency made of a synthetic resin sheet or film such as a polyester film. On the back surface of the base material 22, a liquid crystal layer 24 in which a cholesteric liquid crystal is fixed partially and smaller than the base material 22 is provided so as not to reach the periphery of the base material 22. Furthermore, an adhesive layer 26 formed by applying an adhesive or the like is provided on the back surface of the base material 22 so as to cover the liquid crystal layer 24. In addition, the substrate 22, the liquid crystal layer 24, and the adhesive layer 26 are formed with a plurality of, for example, linear strips 28, 28,... Extending from the periphery of the substrate 22 onto the liquid crystal layer 24. ing. The liquid crystal label 20 is temporarily attached to the surface of the release material 12 by an adhesive layer 26 so as to be peelable.

  As the base material 22, it is suitable to use a plastic film such as PET having transparency, a sheet, or the like. The substrate 22 may be translucent as long as it has transparency. In addition, the base material 22 increases the transparency, and in order to make the liquid crystal layer 24 easily peeled from the liquid crystal layer 24 when the liquid crystal label 20 is to be peeled off from the object, the liquid crystal layer 24 in particular. It is desirable that the surface on the side where the is formed has excellent smoothness. Furthermore, in order to facilitate delamination between the base material 22 and the liquid crystal layer 24, it is desirable that the surface of the base material 22 on which the liquid crystal layer 24 is formed is not surface-treated. However, in order to promote the alignment of the liquid crystal molecules constituting the liquid crystal layer 24, fine linear marks are formed in the longitudinal direction of the base material 22 on the surface of the base material 22 on which the liquid crystal layer 24 is formed. May be.

  A cholesteric liquid crystal is selected as the liquid crystal composition constituting the liquid crystal layer 24. A cholesteric liquid crystal is formed by coating a compound exhibiting a helical cholesteric phase or a chiral nematic phase (see FIG. 3). Examples of the compound exhibiting a cholesteric phase or a chiral nematic phase include cholesteryl nonanoate, cholesteryl myristate, and the like as shown in Table 1, for example.

（表１の注）表１の相転移温度の欄において、Ｃは結晶性固体、Ｓはスメクチック相、Ｓｃ^*はキラルスメクチックＣ相、Ｃｈはコレステリック相、Ｎ^*はキラルネマチック相、Ｉは等方性液体を表す。

(Note to Table 1) In the column of phase transition temperature in Table 1, C is a crystalline solid, S is a smectic phase, Sc ^* is a chiral smectic C phase, Ch is a cholesteric phase, N ^* is a chiral nematic phase, I is etc. Represents an isotropic liquid.

  Further, for example, a chiral nematic phase is formed by adding a chiral compound as shown in Table 3 to a compound showing a nematic phase alone as shown in Table 2 (hereinafter, the cholesteric phase and the chiral nematic phase are differentiated). And collectively referred to as the cholesteric phase).

（表２の注）表２の相転移温度の欄において、Ｃは結晶性固体、Ｎはネマチック相、Ｉは等方性液体を表す。

(Note to Table 2) In the column of the phase transition temperature in Table 2, C represents a crystalline solid, N represents a nematic phase, and I represents an isotropic liquid.

（表３の注）ネマチック相を示す液晶にキラル分子を添加すると、キラルネマチック相（Ｎ^*）が得られる。この場合、その混合液晶のピッチの逆数１／ｐは、キラル分子のモル濃度ｘ_Bが小さい領域では、ｘ_Bに比例する。そのため、１／ｐｘ_Bのことを、キラル分子のねじり力という。

(Note to Table 3) When a chiral molecule is added to a liquid crystal showing a nematic phase, a chiral nematic phase (N ^* ) is obtained. In this case, the reciprocal 1 / p of the pitch of the mixed liquid crystal is proportional to x _B in a region where the molar concentration x _B of the chiral molecule is small. Therefore, 1 / px _B is called the torsional force of chiral molecules.

The liquid crystal layer 24 of the liquid crystal label 20 according to the present invention has a cholesteric phase fixed. As a fixing method, for example, an acrylic group is provided at both ends of liquid crystal molecules, and this is applied to the substrate 22. The coated product is heated to a temperature at which a cholesteric phase can be formed, a cholesteric phase is formed, and UV irradiation is performed by UV irradiation to fix the cholesteric phase. Therefore, the cholesteric phase exists stably even if the environment such as temperature changes.
Alternatively, a mixture of liquid crystal molecules and a commonly used binder may be applied, heated to a temperature at which a cholesteric phase can be formed, a cholesteric phase formed, dried, and the cholesteric phase fixed with a binder.

The liquid crystal layer forming coating liquid may be a solvent system or a non-solvent system that does not contain a solvent.
In the solvent system, ketones such as MEK and MIBK, toluene, ethyl acetate and the like are preferable as the solvent. The solid content concentration is not particularly limited, but is preferably 25 to 67%. If it is less than 25%, the image line may not be formed clearly, and the time required for drying becomes longer. If it exceeds 67%, solids may be deposited unless the coating liquid is heated. A particularly preferred concentration range is 50 to 65%. In order to eliminate the possibility of solid precipitation due to evaporation of the solvent from the coating liquid, coating is also performed while heating the coating liquid.
In the non-solvent system, coating is performed while heating the coating composition to a temperature higher than the minimum temperature at which a cholesteric phase is formed, preferably at a temperature in a temperature range where a cholesteric phase is formed.
In order to fix the cholesteric phase formed in the coated product, both in the solvent system and in the non-solvent system, crosslinking or the like is performed while keeping the liquid crystal layer-forming coated product in the temperature range in which the cholesteric phase is formed. Thus, the cholesteric phase is stably maintained even at a normal temperature, for example, even if the temperature environment changes.

The liquid crystal layer 24 composed of a cholesteric phase exhibits glitter, and the color tone continuously changes depending on the viewing direction. For example, it looks green when viewed vertically from above, and appears blue or bluish purple when viewed in a horizontal direction.
The liquid crystal layer 24 exhibiting the cholesteric phase has a characteristic that only a part of the wavelength region of light incident in a wide spectral region is reflected and all the wavelengths in other regions are transmitted.
Therefore, the authenticity of the liquid crystal label 20 can be identified based on the liquid crystal layer 24.

  The liquid crystal layer 24 is not formed over the entire back surface of the portion excluding the edge of the base material 22, but a liquid crystal layer forming coating liquid for forming the liquid crystal layer 24 is used as an image line composed of characters, pictures and the like. It is partially formed so as to form an image line such as a convex character or a cut character by coating in a shape. Therefore, the authenticity of the liquid crystal label 20 can also be identified by recognizing the shape of the liquid crystal layer 24.

  In the liquid crystal layer, when the helical pitch p (shown in FIG. 3) is increased, the long wavelength color appears, and when the helical pitch p is reduced, the short wavelength color appears. In order to change this pitch, the addition amount of the chiral compound may be changed in the system to which the chiral compound is added.

  The adhesive layer 26 is formed by applying a general pressure-sensitive adhesive such as acrylic or rubber to the back surface of the base material 22 so as to cover the liquid crystal layer 24.

In addition, a plurality of linear peeling cuts 28, 28,... Are formed radially on the base material 22, the liquid crystal layer 24 and the adhesive layer 26 from the periphery of the base material 22 to the end of the liquid crystal layer 24. ing. These peeling cuts 28, 28,... Are intended to make the substrate 22 easy to tear and peel easily when trying to peel off the label from the adherend to replace the liquid crystal label 20. is there.
For example, when the label is peeled off from the adherend to replace the liquid crystal label 20, it is observed that the following phenomenon occurs due to the peeling cuts 28, 28,.
When the label is peeled off from the adherend, peeling of the substrate 22 from the liquid crystal layer 24 begins at the peeling cuts 28, 28,... In combination with the progress of the tearing of 22, peeling further spreads, and finally the base material 22 is peeled off from the liquid crystal layer 24. Therefore, it is extremely difficult to peel off the label from the adherend without breaking the label.

  In the liquid crystal label 20 described above, the liquid crystal layer 24 made of cholesteric liquid crystal is provided smaller than the base material 22 so as not to reach the periphery of the base material 22 on the back surface side of the base material 22, and the adhesive layer 26 covers the liquid crystal layer 24. Thus, it is provided on the back surface side of the base material 22. Therefore, when a plurality of the liquid crystal labels 20 are temporarily attached to the surface of the strip-shaped release material 12 with an interval, a liquid crystal layer is not provided on unnecessary portions around the liquid crystal labels 20. At the time of so-called scrap raising, in which unnecessary portions around the substrate are peeled off from the release material 12, only the unnecessary portion of the base material is not peeled off. Therefore, the liquid crystal label 20 can be easily and reliably manufactured.

  Further, in the above-described liquid crystal label 20, the liquid crystal layer 24 made of cholesteric liquid crystal is provided smaller than the base material 22 so as not to reach the periphery of the base material 22 on the back surface side of the base material 22. Compared with what is provided in the same magnitude | size as the base material 22 so that it may reach to the periphery of this, the material cost of the liquid crystal layer 24 can be held down.

  Further, in the liquid crystal label 20 described above, the liquid crystal layer 24 made of cholesteric liquid crystal is used and the liquid crystal layer 24 cannot be easily counterfeited, so that counterfeiting can be prevented.

  Moreover, in the above-mentioned liquid crystal label 20, since the cut line 28 for peeling extending from the periphery of the base material 22 onto the liquid crystal layer 24 is formed in the base material 22, it is illegally peeled off after being attached to the adherend. Even if it does so, since it peels from the liquid-crystal layer 24, the base material 22 tears so that the cut | interruption line 28 for peeling may be extended, it can prevent being replaced. That is, the separation cut 28 acts as a starting point of separation between the base material 22 and the liquid crystal layer 24, although the liquid crystal layer 24 is provided on the inner side so as not to reach the edge of the base material 22. Therefore, the base material 22 is surely peeled off from the liquid crystal layer 24, and the label cannot be replaced.

  The above-described liquid crystal label 20 is used, for example, for preventing falsification of a compensation period of a hard disk drive (HDD). In this case, the liquid crystal label 20 is attached on a product label representing a serial number, a barcode, or the like provided on the HDD, and only the HDD to which the liquid crystal label 20 is attached is used as a genuine product, thereby compensating for the HDD. When the period is free for 2 years, for example, it is possible to prevent the serial number or barcode from being changed to the serial number or barcode within 2 years ago in an HDD 5 years ago, for example. In this case, the serial number and barcode of the HDD can be seen through the base material 22, the liquid crystal layer 24 and the adhesive layer 26 of the liquid crystal label 20.

  Thus, the above-mentioned liquid crystal label 20 has a high anti-counterfeit effect and an anti-replacement effect, and can easily determine the authenticity of the adherend to which it is attached.

  Next, an example of a specific manufacturing method of the liquid crystal label continuous body 10 having the liquid crystal label 20 will be described.

First, as a base material, a surface-treated PET film with a thickness of 50 μm (E-5000 manufactured by Toyobo Co., Ltd.) is prepared and separately applied to the back surface of the base material to form a liquid crystal layer. Prepare the coating liquid to make up.
As the liquid crystal layer forming coating solution, the following mixed coating solution is used.
Nematic liquid crystal with acrylic groups at both ends (Paliocolor LC242 from BASF) ... 55.3% by weight
Chiral compound (Paliocolor LC756 from BASF) 2.9% by weight
UV polymerization initiator (Irgacure 369 from Ciba Specialty Chemicals) ... 1.8% by weight
Methyl ethyl ketone (MEK) as solvent: 40.0% by weight
With this liquid crystal layer forming coating solution, apply a gravure plate so that the thickness after drying is 3 μm, including the pattern, so as to form a line of convex or blank characters, and then dry zone (110-120 ° C.) is passed through for 15 seconds and dried to form a cholesteric phase. Immediately thereafter, ultraviolet irradiation is performed to perform ultraviolet UV curing to fix the cholesteric phase. The temperature at which the nematic liquid crystal is formed in this coating liquid is 59 ° C. or higher and 120 to 124 ° C. or lower.
Thereby, a liquid crystal layer composed of a stable cholesteric phase is formed on the substrate.

  Next, an adhesive layer is formed by applying a pressure-sensitive adhesive to the surface of the release agent layer side of the release material in which a release agent such as silicone is applied to the surface of the paper to form a release agent layer Are separately prepared, and the back surface of the base material on which the liquid crystal layer is formed and the surface of the adhesive layer formed on the surface of the release material are opposed to each other, and are laminated by passing between the laminating rollers. In this way, a strip-shaped laminate 110 is formed. As shown in FIG. 4, the laminated body 110 includes a plurality of liquid crystal layers 24 made of cholesteric liquid crystal, which are provided on the back side of the belt-like base material 122 and are spaced apart from each other. , 24,... On the surface of the belt-like adhesive layer 126 provided on the back side of the belt-like base material 122 so as to cover the plurality of liquid crystal layers 24, 24,. The strip-shaped release material 12 temporarily attached to the surface opposite to the strip-shaped base material 122 is included. In this laminate 110, liquid crystal layers 24, 24,... Forming a plurality of liquid crystal labels 20, 20,.

  And the cut | interruption which shape | molds the base material 122 and the adhesive bond layer 126 of the laminated body 110 in each liquid crystal label 20 of a suitable magnitude | size is formed, and several cut | notch cuts 28, 28, ... are formed in each liquid crystal label 20. Therefore, as shown in FIG. 5, a cut 202 is formed by the die cutter 200 so as to reach the surface of the release material 12 from the surface side of the base material 122 of the laminate 110. In this case, as the discontinuity 202, as shown in FIG. 6, in the strip-shaped laminate 110, the outer periphery of each of the peripheral edges of the plurality of liquid crystal layers 24, 24,. A label forming cut (label cut) having a shape corresponding to the peripheral edge of the liquid crystal label is formed, and at the same time, the peripheral edge of the liquid crystal label extends from the belt-like base material 122 to the belt-like adhesive layer 126 in the belt-like laminate 110. A separation cut 28, 28,... Extending from the portion onto the liquid crystal layer 24 is formed.

  Then, as shown in FIGS. 6 and 7, an unnecessary portion of the strip-shaped laminate 110 excluding the release material 12 and the liquid crystal label 20, that is, a strip-shaped adhesive from the strip-shaped substrate 122 in the strip-shaped laminate 110. Unnecessary portions outside the label cut across the layer 126 are peeled off from the strip-shaped release material 12 between two peeling rollers 204 and 204 (see FIG. 7), and so-called residue raising is performed. Thereby, the liquid crystal label continuous body 10 having the liquid crystal label 20 is manufactured. In this case, the base material 122 and the adhesive layer 126 are peeled off without peeling only the base material 122 in a part of the unnecessary portion.

As a comparative example, when the liquid crystal layer 24 of the liquid crystal label 20 is provided on the entire back surface of the base material 22 in the liquid crystal label continuum 10 described above, A liquid crystal layer 124 is provided on the entire back surface of the substrate 122.
However, in the laminate 110 in which the liquid crystal layer 124 is provided on the entire back surface of the base material 122, the liquid crystal layer 124 exists in unnecessary portions around the cut 202 made by the die cutter 200 as shown in FIG. When the part is removed by peeling, only the base material 122 may be peeled off from the liquid crystal layer 124 in a partial region of the unnecessary part.
In order to prevent only the unnecessary portion of the base material 122 from being peeled in this way, the peeling strength of the base material 122 from the liquid crystal layer 124 is set to the entire unnecessary portion from the base material 122 to the adhesive layer 126. It is necessary to make it stronger than the peel strength from the release material 12.
Therefore, such a comparative example is difficult to manufacture because it is necessary to adjust the adhesive force of the base material 122 or to select a pressure-sensitive adhesive for the adhesive layer 126 or the like.

  FIG. 9 is a schematic plan view showing another example of the liquid crystal label continuous body according to the present invention, and FIG. 10 is a cross-sectional schematic view of the liquid crystal label continuous body. Compared with the liquid crystal label continuous body 10 shown in FIG. 1, the liquid crystal label continuous body 10 shown in FIG. 9 has a background layer 30 for highlighting the glitter of the liquid crystal layer 24 of the liquid crystal label 20. The back surface of the base material 22 is provided so as to cover the liquid crystal layer 24. Therefore, the adhesive layer 26 is provided so as to cover the liquid crystal layer 24 and the background layer 30 on the surface of the background layer 30 opposite to the base material 22. Further, the separation cuts 28, 28,... Are formed not only in the base material 22, the liquid crystal layer 24 and the adhesive layer 26 but also in the background layer 30.

The background layer 30 is formed by printing and applying black ink, colored ink such as red and blue, and the like. The background layer 30 is formed to highlight the glitter of the liquid crystal layer 24, and is formed over the entire back surface of the base material 22 so as to cover the liquid crystal layer 24. In particular, as the background layer 30, black formed with black ink or the like is excellent for making the glitter of the liquid crystal layer 24 stand out.
In addition, since the visual color tone of the liquid crystal layer 24 changes depending on the color of the background layer 30, the composition and color of the ink forming the background layer 30 are important. For example, when the color of the background layer 30 is black, when the liquid crystal layer 24 is viewed, green to blue or bluish violet color is exhibited, whereas when the background layer 30 is red, the liquid crystal layer 24 is visually observed. When the background layer 30 is colored close to white, the liquid crystal layer 24 exhibits milky white or pearl tone.
Therefore, when the color forming the background layer 30 is divided into two or more, when the liquid crystal layer 24 is viewed, a colorful liquid crystal label corresponding to the color change of the background layer 30 is obtained.

  The liquid crystal label 20 shown in FIG. 9 shows vivid glitter that changes from green to blue-violet depending on the viewing direction, particularly when viewed from the substrate 22 side. Therefore, the authenticity of the liquid crystal label 20 can be identified based on the liquid crystal layer 24. Furthermore, the authenticity of the liquid crystal label 20 can also be identified by recognizing the shape of the liquid crystal layer 24.

  Further, the liquid crystal label 20 shown in FIG. 9 also has the base material 22 so that the liquid crystal layer 24 made of cholesteric liquid crystal does not reach the periphery of the base material 22 on the back surface side of the base material 22, similarly to the liquid crystal label 20 shown in FIG. Since it is provided smaller, it can be manufactured easily and reliably.

  Further, in the liquid crystal label 20 shown in FIG. 9, as in the liquid crystal label 20 shown in FIG. 1, the liquid crystal layer 24 made of cholesteric liquid crystal does not reach the periphery of the base material 22 on the back side of the base material 22. Since the liquid crystal layer 24 is provided smaller, the material cost of the liquid crystal layer 24 can be suppressed as compared with the liquid crystal layer 24 that is provided in the same size as the base material 22 so as to reach the periphery of the base material 22.

  Further, in the liquid crystal label 20 shown in FIG. 9 as well, as the liquid crystal label 20 shown in FIG. 1, the liquid crystal layer 24 made of cholesteric liquid crystal is used, so that forgery can be prevented.

  Further, in the liquid crystal label 20 shown in FIG. 9, as in the case of the liquid crystal label 20 shown in FIG. 1, the separation cut 28 extending from the peripheral edge of the base material 22 to the liquid crystal layer 24 is formed in the base material 22. Even if the substrate 22 is illegally peeled after being stuck to the adherend, the substrate 22 is peeled off from the liquid crystal layer 24 while being broken so as to extend the peeling cut 28, so that it can be prevented from being replaced. That is, the separation cut 28 acts as a starting point of separation between the base material 22 and the liquid crystal layer 24, although the liquid crystal layer 24 is provided on the inner side so as not to reach the edge of the base material 22. Therefore, the base material 22 is surely peeled off from the liquid crystal layer 24, and the label cannot be replaced.

  Similarly to the liquid crystal label 20 shown in FIG. 1, the liquid crystal label 20 shown in FIG. 9 is used, for example, for preventing falsification of a compensation period of a hard disk drive (HDD). In this case, the liquid crystal label 20 is preferably attached so that the serial number and barcode are not covered with the background layer 30 in order to make the serial number and barcode of the HDD easy to see.

  Further, the liquid crystal label 20 shown in FIG. 9 can also be used as a sealing material for a packaging bag for paper for an inkjet printer. The liquid crystal label 20 shown in FIG. 1 can also be used as a sealing material for a packaging bag for paper for an inkjet printer.

  Next, an example of a specific method for manufacturing the liquid crystal label continuous body 10 having the liquid crystal label 20 shown in FIG. 9 will be described.

  First, a liquid crystal layer is formed on a substrate in the same manner as in the above-described manufacturing method for manufacturing the liquid crystal label continuous body 10 shown in FIG.

Next, a black ink coating liquid (PANE ECO manufactured by Toyo Ink Manufacturing Co., Ltd.) for forming the background layer is prepared, and this black ink coating liquid is coated on the back surface of the substrate with a gravure plate so as to cover the liquid crystal layer. It coats so that it may become the average thickness of 3 micrometers after drying. Thereafter, the black ink coating liquid is dried by passing through a drying zone (70 to 80 ° C.) for 3 seconds.
In this way, a background layer covering the liquid crystal layer is formed on the back surface of the substrate.

  Next, an adhesive layer is formed by applying a pressure-sensitive adhesive to the surface of the release agent layer side of the release material in which a release agent such as silicone is applied to the surface of the paper to form a release agent layer Are separately prepared, the surface of the background layer formed on the back surface side of the base material is opposed to the surface of the adhesive layer formed on the surface of the release material, and the two layers are laminated by passing between the laminating rollers. In this way, the laminate 110 having a strip-shaped background layer is formed. As shown in FIG. 11, the laminate 110 is obtained by laminating a strip-like base material 122, a liquid crystal layer 24, a background layer 130, an adhesive layer 126, and a release material 12. Also in this laminate 110, liquid crystal layers 24, 24,... Forming a plurality of liquid crystal labels 20, 20,.

  And the cut | interruption which forms the base material 122 of the laminated body 110, the background layer 130, and the adhesive bond layer 126 in each liquid crystal label 20 of an appropriate magnitude | size, and several peeling notches 28 and 28, In order to form..., A cut 202 is made from the surface side of the base material 122 of the laminate 110 to the surface of the release material 12 by a die cutter 200 as shown in FIG. In this case, the cut 202 is applied to the base material 122, the background layer 130, and the adhesive layer 126 of the laminated body 110 corresponding to the contour of the liquid crystal label 20, and the base material 122, the liquid crystal layer of the laminated body 110. 24, the background layer 130 and the adhesive layer 126 are applied to the plurality of peeling cuts 28, 28,.

  Then, as shown in FIG. 13, unnecessary portions (casses) excluding the release material 12 and the liquid crystal label 20 in the laminate 110 are peeled off from the release material 12 through the separation rollers 204, 204 and removed. So-called scrap raising is performed. Thereby, the liquid crystal label continuous body 10 having the liquid crystal label 20 shown in FIG. 9 is manufactured. In this case, the base material 122, the background layer 130, and the adhesive layer 126 are peeled without peeling only the base material 122 in a partial region of the unnecessary portion.

  In each of the liquid crystal label continuums 10 described above, no binder is used in the liquid crystal layer forming coating liquid constituting the liquid crystal layer 24 in order to facilitate the peeling of the base material 22 from the liquid crystal layer 24. Even if a small amount of binder is added to the coating liquid, the base material 22 can be easily peeled from the liquid crystal layer 24 by suppressing the amount.

  Further, in the liquid crystal label 20 of each liquid crystal label continuous body 10 described above, the base material 22 is formed so as to be easily peeled off from the liquid crystal layer 24, but the liquid crystal label 20 attached to the adherend is attached. In order to prevent the liquid crystal label 20 from being broken and being replaced with a fake label when it is peeled off, the cohesive failure strength of the liquid crystal layer 24 is selected from the cohesive failure strength of other layers and the adhesive strength between the layers. You may comprise weaker. If comprised in this way, when it tries to peel off the liquid crystal label 20 from a to-be-adhered body, it will cohesively destroy in the liquid crystal layer 24 of the liquid crystal label 20, and a label will be pasted on other fake goods, and a fake will be a genuine article. I can't pretend.

Further, in each of the liquid crystal label continuums 10 described above, a plurality of linear peeling cuts 28, 28,... Are formed radially on the liquid crystal label 20. It may be formed in a shape, and is not limited to a radial shape, and may be formed in parallel or crossed.
Further, the separation cuts 28, 28,... Are formed so as to extend from the surface of the base material 22 to the surface of the release material 12, but the separation cuts 28, 28,. The liquid crystal layer 24, the adhesive layer 26, or the background layer 30 other than that may not be formed.

  Moreover, in the manufacturing method of each liquid crystal label continuous body 10 described above, the cut line for label and the cut line for peeling are simultaneously formed in the laminate 110 by the die cutter, but the cut line for label and the cut line for peeling are sequentially formed. Also good. Further, the label cut and the peeling cut may be formed by a laser.

  Furthermore, in the manufacturing method of each liquid crystal label continuous body 10 described above, the cut forming the peeling cut 28 is formed so as to extend from the label forming cut to the inside thereof. A cut may be provided so as to intersect with the forming cut. Thus, if the cut forming the peeling cut 28 is formed so as to intersect the label forming cut, the peeling cut 28 can be reliably formed at the end of the substrate 22.

  Further, in each of the liquid crystal label continuums 10 described above, a plurality of liquid crystal labels 20, 20,... Are provided in one row, but the plurality of liquid crystal labels 20, 20,. May be.

  Further, in each liquid crystal label continuous body 10 described above, the base material 22 of the liquid crystal label 20 is formed in an elliptical shape, but the base material 22 of the liquid crystal label 20 is formed in another shape such as a circular shape or a polygonal shape. Also good.

  Further, in each of the liquid crystal label continuums 10 described above, the liquid crystal layer 24 of the liquid crystal label 20 is partially formed so as to form an image line. May be formed.

  Further, in the liquid crystal label continuous body 10 shown in FIG. 9, the background layer 30 is formed on the entire back surface of the base material 22, but the background layer 30 may be partially formed so as to form an image line. .

  Further, in each liquid crystal label continuum 10 described above, a concealing layer is partially formed between the base material 22 of the liquid crystal label 20 and the liquid crystal layer 24 so as to form an image line with a concealing ink or the like. May be.

  Convex characters and blank characters in each liquid crystal label continuum described above can be formed using gravure printing, flexographic printing, letterpress printing, screen printing, etc., among which gravure printing and flexographic printing are image printing. It is preferable because it is easy to form a line clearly, and more preferably, it is formed by gravure printing.

  According to the present invention, it is possible to obtain a liquid crystal label which can be easily and reliably manufactured and which is prevented from forgery and replacement.

DESCRIPTION OF SYMBOLS 10 Liquid crystal label continuous body 12 Release material 20 Liquid crystal label 22 Base material 24 Liquid crystal layer 26 Adhesive layer 28 Separation for peeling 30 Background layer 110 Laminated body 122 Base material 124 Liquid crystal layer 126 Adhesive layer 130 Background layer 200 Die cutter 202 Break 204 Separation roller

Claims (3)

A substrate having transparency,
A liquid crystal layer made of cholesteric liquid crystal provided smaller than the base material so as not to reach the periphery of the base material on the back side of the base material, and provided on the back side of the base material so as to cover the liquid crystal layer Including an adhesive layer,
The liquid crystal label in which the cut | interruption line for peeling extended from the periphery of the said base material on the said liquid crystal layer in the said base material was formed. A strip-shaped release material, and a liquid crystal label continuum comprising the liquid crystal label according to claim 1, wherein a plurality of the liquid crystal labels are temporarily attached to the surface of the release material at intervals. A method for producing a liquid layer label continuum for producing the liquid crystal label continuum according to claim 2,
Covering a transparent strip-shaped base material, a liquid crystal layer made of cholesteric liquid crystal for a plurality of liquid crystal labels provided at intervals on the back side of the strip-shaped base material, and a plurality of liquid crystal layers for the liquid crystal labels A strip-shaped adhesive layer provided on the back side of the strip-shaped base material, and a strip-shaped release layer temporarily attached to the surface of the strip-shaped adhesive layer opposite to the strip-shaped base material Forming a strip-shaped laminate including a material,
In the strip-shaped laminate, a label cut having a shape corresponding to the peripheral edge of the liquid crystal label is formed outside the peripheral edges of the liquid crystal layers for the plurality of liquid crystal labels from the strip-shaped base material to the strip-shaped adhesive layer. Process,
A step of forming a break for peeling so as to extend on a liquid crystal layer for the liquid crystal label from a portion which becomes a peripheral edge of the liquid crystal label in at least the strip-shaped substrate in the strip-shaped laminate, and the strip-shaped laminate in the strip-shaped laminate A method for producing a continuous liquid crystal label, comprising a step of peeling an unnecessary portion outside the label cut extending from the base material to the strip-shaped adhesive layer from the strip-shaped release material.

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