JPH11348421A - Heat sensitive label and sheet for heat sensitive label - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heat sensitive label, capable of being employed optimally as an index seal or the like, easy in folding and excellent in the bonding condition of folded parts, by a method wherein the label is bonded under the condition of being folded after recording a desired picture on the surface thereof. SOLUTION: A heat sensitive label 1 is constituted of a heat sensitive recording layer and an adhesive layer while the label 1 is used under the condition of being folded. The folding part 4 is cut 5 so as to be the line of perforation while the total length of the cut lines is 30-70% of the folding part 4. In another case, the heat sensitive label is constituted of the heat sensitive recording layer and the adhesive layer while the label is used under the condition of being folded. In this case, cut-in parts are formed in the direction of thickness at the folding part. The thickness of the label is preferable to be 250-300 μm and the nature is preferable to be suitable for full color.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sensitive label and a sheet for a heat-sensitive label, wherein a desired image is recorded on the surface and then bonded in a folded state so that it can be suitably used as an index seal or the like. The present invention relates to a heat-sensitive label that can be easily folded and has a good bonded state at a bent portion, and a heat-sensitive label sheet that can hold the heat-sensitive label from before image recording until use after image recording.

[0002]

2. Description of the Related Art In recent years, it has become popular to record a high-quality photographic image or the like on the surface of a heat-sensitive label in the form of a sticker and stick the heat-sensitive label to a notebook or the like. Such a heat-sensitive label in a seal is heated in the image recording apparatus,
Since the paper is transported while being held between rollers, it is required to have strength and the like that can withstand these, and it is required that peeling due to curl or the like after sticking to a notebook or the like does not occur. For this reason, the heat-sensitive label is usually formed thick. By the way, various uses and uses of such a heat-sensitive label in the form of a seal can be considered. For example, by bonding the heat-sensitive label in a folded state, the use and use as an index can be considered. However, the present inventors have studied that a thickly formed heat-sensitive label is difficult to bend, and when the heat-sensitive label is used as the index or the like, the bonding near the bent portion becomes poor. It has been found that problems such as the occurrence of such problems occur.

[0003]

SUMMARY OF THE INVENTION The present invention is based on the findings obtained by the study of the present inventors, and aims to solve the above problems and achieve the following objects. That is, the present invention, after recording the desired image on the surface,
By bonding in a folded state, it can be suitably used as an index seal and the like, and can be easily bent, and a heat-sensitive label in which a bent portion has a good bonding state, and use before and after image recording. It is an object of the present invention to provide a heat-sensitive label sheet that can hold the heat-sensitive label until time.

[0004]

Means for solving the above problems are as follows. That is, <1> a heat-sensitive label having a heat-sensitive recording layer and an adhesive layer, which is used by being bent, wherein at least the bent portion is cut in a perforated shape, and the total length of the cut length is A heat-sensitive label characterized in that the length is 30 to 70% of the length of the bent portion. <2> A heat-sensitive label which has a heat-sensitive recording layer and an adhesive layer and is used by being folded, wherein a cut is formed in at least a bent portion in a thickness direction of the heat-sensitive label. It is. <3> The heat-sensitive label according to <1> or <2>, wherein the thickness is 250 to 300 µm. <4> The heat-sensitive label according to any one of <1> to <3>, which is for full color use. <5> A heat-sensitive label sheet comprising the heat-sensitive label according to any one of <1> to <4> on a support.

[0005] In the thermal label according to the above <1>, at least the bent portion is cut in a perforated shape, and the total length of the cut length is 30 to 70% of the length of the bent portion.
Therefore, the bending is easy and the bonding state of the bent portion is good. The heat-sensitive label described in the above <2> has a cut in the thickness direction at least in the bent portion, so that the label can be easily bent and the bonded state of the bent portion is good. The heat-sensitive label according to <3> has a thickness of 250 to 300.
Since the thickness is μm, heat resistance, transportability, and the like in the image recording apparatus are good. Since the thermal label described in <4> is for full color, a full color image such as a photographic image is recorded on the surface. The heat-sensitive label sheet according to <5> includes the heat-sensitive label according to any one of <1> to <4> on a support, from before image recording until use after image recording. The thermal label can be retained.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the heat-sensitive label and the heat-sensitive label sheet of the present invention will be described in detail. (Thermal Label) The thermal label of the present invention has at least a thermosensitive recording layer and an adhesive layer, and further has other layers such as an intermediate layer appropriately selected as necessary. The heat-sensitive label of the present invention is used in a folded state, and is not particularly limited, except that a cut and / or a cut is formed in the bent portion, and a known heat-sensitive label (for example,
A configuration similar to that described in JP-A-9-248974 can be employed.

The heat-sensitive recording layer is not particularly limited as long as an image can be recorded by a known image recording apparatus. For example, a heat-sensitive recording layer described in JP-A-4-28585 can be used. The heat-sensitive recording layer may be for forming a single-color image, or may be for forming a multi-color image,
When used for full color, a color photographic image or the like can be formed on the heat-sensitive recording layer. The image recording on the heat-sensitive recording layer can be performed by using a known image recording apparatus according to a known image recording method. Image recording by a sublimation type image recording device is preferred.

The pressure-sensitive adhesive layer is formed on one surface of the heat-sensitive recording layer. The adhesive layer has a function of attaching the heat-sensitive label of the present invention to an object. The pressure-sensitive adhesive layer is not particularly limited as long as it has the function, and can be formed of a known material according to the purpose. For example, a pressure-sensitive adhesive layer described in JP-A-9-248974 can be used. it can. Preferred examples of the material include a binder, a plasticizer, and a tackifier, and mixtures thereof.

Examples of the binder include acrylic resin and rubber. As the plasticizer,
For example, mineral oil, liquid polybutene, liquid polyacrylate, phthalate, lanolin and the like can be mentioned. Examples of the tackifier include hydrocarbons, rosin derivatives, and polyterpenes.

[0010] The adhesive layer can be formed, for example, as follows. That is, each component such as the binder is dissolved in a known solvent appropriately selected to prepare a coating solution for an adhesive layer. Then, it can be formed by applying the coating liquid for an adhesive layer on one surface of the heat-sensitive recording layer and drying. The application of the adhesive layer coating liquid can be performed by a known coating method, for example, an air doctor coater, a blade coater, a rod coater, a knife coater, a squeeze coater, a reverse roll coater, a bar coater, or the like. It can be performed using: Drying of the coating solution for the adhesive layer is generally carried out at 50-18.
It is about 5 to 20 minutes at 0 ° C.

The thickness of the thermal label of the present invention is 25
It is preferably from 0 to 300 µm, more preferably from 260 to 290 µm. If the thickness exceeds 300 μm, jamming may occur during printing, and if the thickness is less than 250 μm,
The image quality of the print may decrease. On the other hand, when the thickness is
When it is within the above-mentioned numerical range, there is no such a thing, and it is advantageous in that the printing quality is excellent and the heat-sensitive label can be prevented from curling.

In the present invention, the bent portion is cut in a perforated shape, and a first aspect in which the total length of the cut length is 50% or more of the length of the bent portion, a cut in a thickness direction thereof. It is formed in the second mode that is formed, and in the third mode in which a cut is made in a perforated shape and a cut is formed in the thickness direction. As a result of the bent portions being formed in these modes, the heat-sensitive label of the present invention is easy to be bent, and the bonded state of the bent portions is good.

In the first aspect, if the total length of the perforated cuts is less than 30% of the length of the bent portion, the bending is not easy, and the bonded state of the bent portion is poor. May be. On the other hand, the total length of the perforated cut is 70% of the length of the bent portion.
If it exceeds, the strength of the bent portion may not be sufficient. The perforated cut may be formed on the entire surface of the bent portion, may be formed partially, may be formed at equal intervals, or may not be formed at equal intervals. However, in the present invention, it is preferable that the bent portions are formed at equal intervals on the entire surface.

In the second aspect, the cut in the bent portion may be formed on the entire surface of the bent portion or may be formed on a part thereof. Is preferably formed over the entire surface of the substrate. The depth of the cut can be appropriately selected according to the strength of the heat-sensitive label and the like without departing from the object of the present invention.

In the third aspect, the cut and cut at the bent portion may be formed on the entire surface of the bent portion or may be formed on a part thereof. It is preferably formed on the entire surface of the bent portion.

The cutting and / or cutting at the bent portion can be formed by using a known cutting means such as a cutter. The heat-sensitive label of the present invention is suitably held on the following heat-sensitive label sheet of the present invention from before image recording until use after image recording.

(Sheet for heat-sensitive label) The sheet for heat-sensitive label of the present invention has the heat-sensitive label of the present invention on a support. That is, on the sheet-like support, the support and the sheet-like heat-sensitive label of the present invention are laminated so as to be peelable.

The material of the support has a strength enough to withstand heating, transportation, etc. in a thermal recording apparatus. At this time, the thermal label of the present invention is held, and the thermal label is used only when used. There is no particular limitation as long as it is a material that can be peeled off, and it can be appropriately selected from known materials according to the purpose.For example, polyesters such as polyethylene terephthalate, nitrocellulose, cellulose esters such as cellulose acetate butyrate , Polysulfone, polyphenylene oxide, polyimide, polycarbonate, polyamide and the like. The support is
It may be formed of only these resins, or may be formed by coating one or both surfaces of paper or the like with these resins.

The thickness of the support is not particularly limited and may be appropriately selected depending on the purpose.
It is preferably about 110 μm.

In the heat-sensitive label sheet of the present invention,
The thermal label laminated on the support is punched into a desired shape and size. The punching of the heat-sensitive label can be performed using a known cutting means such as a cutter. In the case where the thermal label in the thermal label sheet is punched into a desired shape and size by the cutting means, a plurality of the punched thermal labels are present on the support. The heat-sensitive label punched into the desired shape and size is peeled from the support at the time of use. In the production of the thermal label sheet of the present invention, the cut and / or cut may be formed in the bent portion of the thermal label at the same time as the punching of the thermal label. This case is preferable in terms of manufacturing efficiency.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings, but the present invention is not limited to these embodiments. (Embodiment 1) FIG. 1 is a schematic view (top view) for explaining one embodiment of a thermal label sheet of the present invention in which a plurality of thermal labels of the present invention are held on the surface. The thermal label sheet 10 shown in FIG. 1 is formed by laminating a thermal label on a sheet having the same shape as the support on a sheet-like support (not shown).

The heat-sensitive label is formed by laminating a heat-sensitive recording layer on which an image is recorded and an adhesive layer, and the adhesive layer is releasably attached to the surface of the support. (Support) The support was obtained as follows. That is, a biaxially stretched film [Toyobo Co., Ltd. product name “Crisper” (100 μm foamed PET smoothed by a roll) manufactured by Toyobo Co., Ltd.) foamed by filling and stretching a pigment in polyethylene terephthalate is added to a silicone-based film. Release agent (Toray Dow Corning Silicone Co., Ltd., LTC-
750A) was applied using a Meyer bar so as to be 0.2 ± 0.05 g / m ² (when dried) to obtain a support having a release layer (release sheet).

(Adhesive Layer) The adhesive layer was formed as follows. That is, 2 parts by weight of a polyfunctional aromatic polyisocyanate (Nippon Polyurethane Industry Co., Ltd., Coronate L) is used as a cross-linking agent with respect to 100 parts by weight of an acrylic pressure-sensitive adhesive (Toyo Ink Co., Ltd., BPS-4849-40N). Then, the mixture was added to the support (release sheet), and the mixture was applied using an applicator so as to be 15 g / m ² (when dried) to form the adhesive layer.

(Thermal Recording Layer) The thermal recording layer was formed by the following method. (1) Preparation of coating solution for first heat-sensitive recording layer (1) -1 [Preparation of capsule solution of electron-donating dye precursor]
As the electron-donating dye precursor, 3- (o-methyl-p-
Dimethylaminophenyl) -3- (1′-ethyl-2 ′
(Methyl-indol-3-yl) phthalide (3.0 parts) was dissolved in ethyl acetate (20 parts), and a high-boiling solvent (alkylnaphthalene) (20 parts) was added, followed by heating and uniform mixing. As a capsule wall material, 20 parts of an xylylene diisocyanate / trimethylolpropane adduct was further added to this solution, and uniformly stirred to obtain an electron-donating dye precursor solution. Separately, polyvinyl alcohol (degree of polymerization 1700,
54 parts of a 6% by weight aqueous solution (having a degree of saponification of 88%) was prepared, and the above electron-donating dye precursor solution was added thereto, followed by emulsification and dispersion with a homogenizer. After 68 parts of water was added to the obtained emulsion to homogenize it, the temperature was raised to 80 ° C. with stirring, and an encapsulation reaction was carried out for 3 hours to prepare a desired electron donor dye precursor capsule solution. The average particle size of the capsules in the electron donor dye precursor capsule solution was 1.6 μm.

(1) -2 [Preparation of Electron-Accepting Compound Dispersion] As an electron-accepting compound, 30 parts of bisphenol A was added to 150 parts of a 4% by weight aqueous solution of polyvinyl alcohol and dispersed in a ball mill for 24 hours. An acceptor compound dispersion was prepared. The average particle size of the electron accepting compound in the electron accepting compound dispersion was 1.2 μm.

(1) -3 [Preparation of coating solution for first heat-sensitive recording layer] Next, the above-mentioned electron-donating dye precursor capsule solution and the above-mentioned electron-accepting compound dispersion are mixed in the ratio (electron-donating dye). (Precursor / electron-accepting compound) were mixed so as to be １ ／, thereby preparing an intended coating solution for the first heat-sensitive recording layer.

(2) Preparation of coating solution for second heat-sensitive recording layer (2) -1 [Preparation of capsule solution of diazonium salt compound]
As the diazonium salt compound, 4- (N- (2- (2,2
Dissolve 2.0 parts of 4-di-tert-amylphenoxy) butyryl) piperazinobenzenediazonium hexafluorophosphate in 20 parts of ethyl acetate, add 20 parts of alkylnaphthalene as a high-boiling solvent, and heat to uniformly dissolve. Was mixed. As a capsule wall material, 15 parts of an adduct of xylylene diisocyanate / trimethylolpropane was further added to this solution, and the mixture was stirred uniformly to obtain a diazonium salt compound solution. Separately, 54 parts of a 6% by weight aqueous solution of polyvinyl alcohol (degree of polymerization: 1700, degree of saponification: 88%) was prepared, the above diazonium salt compound solution was added, and the mixture was emulsified and dispersed by a homogenizer. Water 68 is added to the obtained emulsion.
Then, the mixture was homogenized, heated to 40 ° C. with stirring, and subjected to an encapsulation reaction for 3 hours to prepare a target diazonium salt compound capsule solution. The average particle size of the capsules in the diazonium salt compound capsule solution was 1.1 μm.

(2) -2 [Preparation of Coupler Emulsion Dispersion]
1- (2′-octylphenyl) -3 as a coupler
-Methyl-3-pyrazolone 2 parts, 1,2,3-triphenylguanidine 2 parts, tricresyl phosphate 0.3
Parts and 0.1 part of diethyl maleate in ethyl acetate
0 parts, and a 6% aqueous solution of polyvinyl alcohol 50
g and 2% sodium dodecylbenzenesulfonate solution 2
g in an aqueous solution mixed with
The mixture was emulsified for 0 minutes to prepare a coupler emulsified dispersion.

(2) -3 [Preparation of Coating Solution for Second Thermosensitive Recording Layer] Next, the diazonium salt compound capsule solution and the coupler emulsified dispersion were mixed in a ratio (diazonium salt compound / coupler) of 2 / The mixture was mixed so as to obtain No. 3 to prepare an intended coating solution for the second heat-sensitive recording layer.

(3) Preparation of coating solution for third heat-sensitive recording layer (3) -1 [Preparation of capsule solution of diazonium salt compound]
As a diazonium salt compound, 2,5-dibutoxy-4
-3.0 parts of tolylthiobenzenediazonium hexafluorophosphate are dissolved in 20 parts of ethyl acetate, and 20 parts of alkylnaphthalene, which is a high boiling point solvent, is added;
Heat to mix evenly. As a capsule wall material, 10 parts of an xylylene diisocyanate / trimethylolpropane adduct was further added to this solution, and the mixture was stirred uniformly to obtain a diazonium salt compound solution. Separately, 54 parts of a 6% by weight aqueous solution of polyvinyl alcohol (degree of polymerization: 1700, degree of saponification: 88%) was prepared, the above diazonium salt compound solution was added, and the mixture was emulsified and dispersed by a homogenizer. 68 parts of water was added to the obtained emulsion, and the mixture was homogenized.
The temperature was raised to 0 ° C., and the encapsulation reaction was performed for 3 hours to prepare a target diazonium salt compound capsule solution. The average particle size of the capsules in the diazonium salt compound capsule solution was 1.0 μm.

(3) -2 [Preparation of emulsified dispersion of coupler]
As a coupler, 2-chloro-5- (3- (2,4-di-tert-pentyl) phenoxypropylamino) acetoacetanilide 2 parts, 1,2,3-triphenylguanidine 2 parts, tricresyl phosphate 0.1 part. 3 parts and 0.1 part of diethyl maleate are dissolved in 10 parts of ethyl acetate, and 50 g of a 6% aqueous polyvinyl alcohol solution and 2 parts of
The solution was added to an aqueous solution obtained by mixing 2 g of a 2% sodium dodecylbenzenesulfonate solution, and emulsified with a homogenizer for 10 minutes.

(3) -3 [Preparation of Coating Solution for Third Thermal Recording Layer] Next, the diazonium salt compound capsule solution and the coupler emulsified dispersion were mixed at a ratio (diazonium salt compound / coupler) of 4 / The resulting mixture was mixed so as to obtain a coating liquid for the third heat-sensitive recording layer.

(4) Coating / Drying The coating solution for the first heat-sensitive recording layer and the coating solution for the second heat-sensitive recording layer, using a Meyer bar on the adhesive layer of the support on which the adhesive layer is formed. The liquid and the coating liquid for the third heat-sensitive recording layer were sequentially applied and dried to form a target multicolor heat-sensitive recording layer on the support. The coating amount of each of the above thermosensitive recording layer coating solutions as a solid content was 5.2.
g, 6.3 g, and 6.8 g.

The thickness of the heat-sensitive label of Example 1 manufactured as described above was 278 μm when measured according to JIS-P-8118.

In Example 1, the heat-sensitive label is
A large number of rectangular pieces are punched out, and the thermal label 1 is present on the support as a number of rectangular pieces. When the thermal label 1 is formed by punching, a perforated cut 5 is formed in each thermal label 1 so as to connect the midpoints of its long sides. In each heat-sensitive label 1, the portion where the perforated cut 5 is formed functions as the bent portion 4. The total length of the perforated cuts 5 is about 60% of the length of the bent portion 4.

A cutter is used for punching the thermal label 1 and forming the perforated cuts 5. The cutter is provided with a large number of cutting blades having the same shape as the heat-sensitive label 1 in order to form a large number of heat-sensitive labels 1 on the support (in the first embodiment, each cutting blade is arranged in the longitudinal direction of the heat-sensitive label sheet 10). With the longitudinal direction of the thermal label 1 positioned, five cutting blades for forming the thermal label 1 are arranged in the longitudinal direction of the thermal label sheet 10 and five in the direction orthogonal to the longitudinal direction. In the thermal label sheet 10, only the sheet-like thermal label is cut (punched), and the support is not cut (not punched).

Therefore, the thermal label sheet 10 of the first embodiment holds 25 thermal labels 1. Each thermal label 1 in the thermal label sheet 10 is peeled from the support at the time of use after the image is formed by the image recording apparatus, and is adhered to the target. At this time, since each heat-sensitive label 1 has the bent portion 4 formed by the perforated cut 5, the heat-sensitive label 1 can be easily bent along the bent portion 4, and each heat-sensitive label 1 is in a folded state. And can be suitably used as an index or the like. In the heat-sensitive label 1 stuck in the bent state, the stuck state of the bent portion 4 is good and does not cause peeling or the like.

Example 2 FIG. 2 is a schematic view (top view) for explaining another example of the thermal label sheet of the present invention in which a plurality of thermal labels of the present invention are held on the surface. . The heat-sensitive label sheet 10 shown in FIG. 2 is obtained by laminating a heat-sensitive label on a sheet having the same shape as the support on a sheet-like support (not shown). 1. Thermal label sheet 10 and thermal label 1 and applications
The functions, operations, configurations, and the like are all the same.

The second embodiment differs from the first embodiment in that notches 6 are formed at both ends of the bent portion 4 of each heat-sensitive label 1 held on the heat-sensitive label sheet 10.
And different. In each of the thermal labels 1 of the second embodiment, since the cut 6 is formed, the length of the bent portion 4 is shorter than that of the first embodiment.

Example 3 FIG. 3 is an enlarged schematic sectional view of a heat-sensitive label sheet of the present invention in which a plurality of heat-sensitive labels of the present invention are held on the surface. The heat-sensitive label sheet 10 shown in FIG. 3 is obtained by laminating a heat-sensitive label on a sheet having the same shape as the support 9 on a sheet-like support 9 and excluding the following points. All the uses, functions, functions, configurations, and the like are the same as those of the application sheet 10 and the thermal label 1.

The third embodiment is different from the third embodiment in that a thickness direction cut 7 is formed instead of a perforated cut 5 in the bent portion 4 of each heat-sensitive label 1 held on the heat-sensitive label sheet 10. Different from Example 1. Example 3
In each of the heat-sensitive labels 1, as the thickness direction cut 7 is formed, the bent portion 4 can be easily bent. Also,
The bonded state of the bent portion 4 in the heat-sensitive label 1 bonded in the bent state is good and does not cause peeling or the like.

[0042]

According to the present invention, the above-mentioned conventional problems can be solved, and a desired image can be recorded on the surface and then adhered in a folded state to be suitably used as an index seal or the like. Further, the present invention provides a heat-sensitive label that can be easily folded and has a good bonded state at a bent portion, and a heat-sensitive label sheet that can hold the heat-sensitive label from before image recording until use after image recording. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining one embodiment of a heat-sensitive label sheet of the present invention in which a plurality of heat-sensitive labels of the present invention are held on the surface.

FIG. 2 is a schematic diagram for explaining another embodiment of the thermal label sheet of the present invention holding a plurality of thermal labels of the present invention on the surface.

FIG. 3 is an enlarged schematic cross-sectional view of a thermal label sheet of the present invention holding a plurality of thermal labels of the present invention on the surface.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 heat-sensitive label 2 heat-sensitive recording layer 3 adhesive layer 4 bent part 5 perforated cut 6 cut 7 thickness cut 8 punched part 9 support 10 sheet for heat-sensitive label

Claims (5)

[Claims] 1. A heat-sensitive label having a heat-sensitive recording layer and an adhesive layer, which is used by being bent, wherein at least a bent portion is cut in a perforated shape, and the total length of the cut length is reduced. The heat-sensitive label is 30 to 70% of the length of the bent portion. 2. A heat-sensitive label which has a heat-sensitive recording layer and an adhesive layer and is used by being bent, wherein at least a bent portion has a cut formed in its thickness direction. Thermal label. 3. The heat-sensitive label according to claim 1, wherein the thickness is 250 to 300 μm. 4. The heat-sensitive label according to claim 1, which is for full color use. 5. A heat-sensitive label sheet comprising the heat-sensitive label according to claim 1 on a support.