JP2003228290A - No-separator type thermosensitive recording label and continuous label body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a no-separator type thermosensitive recording label which obviates the occurrence of adhesion to a thermal head in spite of printing with a printer, a no-separator type thermosensitive recording label which is provided with a release layer having releasability to a pressure-sesitive adhesive layer joined thereto even in the absence of release paper and obviates the occurrence of adhesion to the thermal head in spite of printing with the printer and a continuous body of the no-separator type thermosensitive recording labels. <P>SOLUTION: The no-separator type thermosensitive recording label is formed by laminating a thermosensitive color developing layer and a release layer on one surface of a base material and providing another one surface of the base material with an adhesive layer, in which approximately spherical particles are incorporated into the release layer in order to prevent sticking and the continuous body of such labels. Since the approximately spherical particles 20b included in the release layer 20 act as rollers, the prevention of sticking, etc., are made possible. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-separator type thermosensitive recording label and a label continuum which do not require a release paper, and more particularly to a thermal head of a printer which prints a thermosensitive coloring layer by thermosensitive coloring. The present invention relates to a non-separator-type heat-sensitive recording label and a label continuum capable of preventing a separator forming a surface layer of a heat-sensitive recording label from adhering thereto.

[0002]

2. Description of the Related Art In a non-separator type heat-sensitive recording label without a release paper, a non-separator type heat-sensitive recording label is wound on a surface thereof by applying a substance having releasability. It becomes possible to use it, and it becomes possible to obtain a roll-shaped no-separator type heat-sensitive recording label.

[0003]

The surface of the peeling layer is required to be smooth in order to perform uniform printing on the thermosensitive coloring layer. However, when the surface of the peeling layer is too smooth, Due to the interfacial interaction between the thermal head and the release layer interface, the phenomenon that the surface layer of the no-separator type thermal recording label is likely to stick to the thermal head was recognized, and when the printer tried to print, it had releasability. A phenomenon may occur in which the substance adheres to the thermal head.

Therefore, the main object of the present invention is to eliminate the sticking between the thermal recording head and the no-separator type thermal recording label, and to print by a thermal printer.
A non-separator type heat-sensitive recording label that prevents sticking of the substance forming the release layer to the thermal head, and a peeling property with the adhesive layer on the back side even without a release paper, and a printer Another object of the present invention is to provide a non-separator type thermal recording label continuous body which prevents sticking of a substance forming a peeling layer to a thermal head even when printing is carried out, and prevents sticking.

[0005]

The inventor has arrived at the present invention as a result of earnest research. That is, the present invention has been accomplished in view of smooth contact between the contact surfaces of the two when the principle of rollers is used to smooth the contact with the thermal head in the release layer. In the no-separator type thermosensitive recording label and the label continuum according to claim 1 of the present invention, the thermosensitive coloring layer and the peeling layer are laminated on one surface of the substrate, and the adhesive layer is provided on the other surface of the substrate. A non-separator type thermal recording label and a label continuum in which substantially spherical particles are mixed in the release layer so as to prevent sticking. The non-separator type thermal recording label and the label continuum according to claim 2 of the present invention are characterized in that the substantially spherical particles are composed of organic particles, and It is a label continuum. The non-separator type heat-sensitive recording label and the label continuum according to claim 3 of the present invention are characterized in that a part of substantially spherical particles are projected from the surface of the release layer. A non-separator type thermosensitive recording label and a label continuum according to any one of claims.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of the embodiments of the invention with reference to the drawings.

[0007]

1 is a perspective view of a continuous body of a no-separator type thermal recording label according to an embodiment of the present invention, and FIG. 2 is a no-separator type according to an embodiment of the present invention. It is a sectional view solution figure of a thermosensitive recording label continuum.
The continuous body 10 of the non-separator type thermal recording labels is a long one in which a plurality of the non-separator type thermal recording labels 12 are continuously formed, and is formed at the boundary of the respective non-separator type thermal recording labels 12. Each piece is cut at the perforations 14 and used as a single heat-sensitive recording label. In this non-separator type thermal recording label continuous body 10, a pressure sensitive adhesive layer 18 made of a pressure sensitive adhesive is formed on the back surface of a long base material 16, and a release layer 20 is formed on the front surface side. . Further, the release layer 2
A thermosensitive coloring layer 22 is formed on the surface of the base material 16 as a lower layer of 0, and a protective layer 24 for protecting the thermosensitive coloring layer 22 is usually formed on the surface of the thermosensitive coloring layer 22. Further, usually, on the surface of the protective layer 24 and below the release layer 20,
A printing layer 26 is formed on a part of the printing layer 26 and is covered with the peeling layer 20. Furthermore, the base material 16 and the pressure-sensitive adhesive layer 1
8 may form an undercoat layer.

As shown in FIG. 1, the continuous body 10 of the no-separator type heat-sensitive recording label is separated from each other and used as the no-separator type heat-sensitive recording label 12 before the release layer 20 side and the pressure-sensitive type. The adhesive layer 18 is wound around the core tube 28 in a roll shape so that the adhesive layer 18 is joined and temporarily attached. However, when the continuous body 10 of the thermal recording label without separator type is used, the action of the peeling layer 20 is obtained. It can be used to rewind and separate the non-separator type thermosensitive recording label 12 to adhere the surface of the pressure sensitive adhesive layer 18 to another object. Further, in this continuous body 10 of the non-separator type thermal recording label, perforations 14 are formed. Each perforation 14 is formed at the boundary of each no-separator type heat-sensitive recording label 12 which constitutes the no-separator type heat-sensitive recording label continuous body 10. When each no-separator type heat-sensitive recording label 12 is separated and used, The separation of each non-separator type thermal recording label 12 is facilitated.

The long base material 16 can be cut with a hand or a machine tool such as a cutter such as a plastic film or sheet such as paper, synthetic paper, cellophane, polystyrene, polyethylene terephthalate, or aluminum foil. It is desirable that the material can be used. Pressure-sensitive adhesive layer 18 formed on the back surface of the base material 16
Is for giving each non-separator type heat-sensitive recording label an adhesive force for adhering to another object. For example, a known adhesive such as an acrylic copolymer resin or a rubber adhesive is used.

Thermosensitive coloring layer 2 formed on the surface of the base material 16.
2 is formed, for example, by applying and drying a thermosensitive coloring composition containing a mixture of a leuco dye, an acidic substance, a binder and the like. In this case, examples of the leuco dye include crystal violet lactone, 3-indolino-3-P-dimethylaminophenyl-6-dimethylaminophthalide, 3-diethylamino-7-chlorofluorane, and 2-diethylamino-7-cyclohexyl. Aminofluorane, 3-diethylamino-5-methyl-7-t-
Butylfluorane, 3-diethylamino-6-methyl-
7-anilinofluorane, 3-diethylamino-6-methyl-7-p-butylanilinofluorane and the like can be mentioned.

As the acidic substance, for example, 2,
2-bis (4'-oxyphenyl) propane, 4-phenylphenol, 4-hydroxyacetophenone, 2,
2'-dihydroxydiphenyl, 2,2'-methylenebis (4-methyl-6-t-butylphenol), 4,4
′ -Isopropylidene diphenol, 4,4′-isopropylidene bis (2-chlorophenol), 4,4′-
Isopropylidene bis (2-methylphenol), 4,
4'-ethylenebis- (2-methylphenol), 4,
4'-thiobis (6-t-butyl-3-methylphenol) and the like can be mentioned.

Further, as the binder, for example, polyvinyl alcohol, methoxycellulose, hydroxyethyl cellulose, carboxymethyl cellulose, polyacrylamide, polyacrylic acid, starch, gelatin,
Examples thereof include polystyrene and vinyl chloride-vinyl acetate copolymer. The thermosensitive coloring layer 22 can be colored by heating it with a thermal head or the like of a printer.

A protective layer 2 for protecting the thermosensitive coloring layer 22.
In the case of forming No. 4, for example, a resin such as polyvinyl alcohol or an acrylic resin is included, and the thermosensitive coloring layer 22 is formed to have excellent chemical resistance, plasticizer resistance, and the like.

When the printing layer 26 is formed, it is formed by printing using a general printing ink by a known printing method such as flat plate, letterpress or offset printing. In particular, considering the influence on the heat-sensitive color forming layer 22, for example, a bad influence such as a so-called fogging phenomenon, it is preferable to use an ultraviolet curable ink.

The undercoat layer is formed in order to effectively use the heat of the thermal head and to prevent the background fog of the thermosensitive coloring layer 22. This undercoat layer contains, for example, a latex such as SBR or NBR, a resin such as a water-soluble resin such as polyvinyl alcohol or an acrylic resin, and may further contain a particulate material such as calcium carbonate or silica, an elastic material or the like.

The release layer 20 is a release agent matrix 20a.
Is coated with a dispersion of substantially spherical particles 20b, and the release agent matrix 20a is composed of, for example, a release agent containing a silicone resin as a main component.
b reinforces the coating film of the release agent matrix 20a and acts as a roller to smooth the contact between the thermal head and the release layer 20, and as a result, prevents sticking of the thermal head when printing with the thermal head. ,
Good quality printing can be obtained.

The silicone resin includes solvent type, emulsion type and solventless type, and the solventless type is preferable as the silicone resin used as the release agent matrix 20a of the present invention. The solvent system is
Because of the inclusion of solvents and the emulsion systems contain water, these types of silicones require that the solvent and water be splashed off after application. However,
Since the solventless system does not contain water or solvent,
The peeling layer 20 can be easily formed.

For example, if the release layer 20 forming the outermost layer of the no-separator type heat-sensitive recording label 12 is a cationic polymerization type silicone resin, it is sufficiently cured by irradiation with ultraviolet rays, so that the no-separator type heat-sensitive recording label continuum 10 is obtained.
When is wound, even if the adhesive layer 18 formed on the back surface of the base material 16 and the peeling layer 20 are joined, the peeling layer 20 has sufficient peelability and can be rewound. Further, if the release layer 20 forming the outermost layer of the no-separator type thermal recording label 12 is a thermosetting silicone resin, it is sufficiently cured by adding a catalyst. The base material 16 when wound
Even if the adhesive layer 18 and the peeling layer 20 formed on the back surface of the peeling layer 20 are bonded to each other, the peeling layer 20 has sufficient peelability and can be rewound. The catalyst is not particularly limited as long as it cures a thermosetting silicone resin, and for example, a platinum catalyst or the like is used. The thickness of the peeling layer 26 is generally 1 μm to 2 μm.

Here, the substantially spherical particles mean organic and inorganic substantially spherical particles. Incidentally, the substantially spherical particles,
Not only spherical particles but also particles lacking a part of the particle surface, egg-shaped, fruit-shaped, and ellipsoidal-shaped particles belong to the category of substantially spherical particles referred to in the present invention. As the organic particles, methyl methacrylate, styrene, polyethylene wax, silicone resin particles, polytetrafluoroethylene, etc. are used. As the inorganic particles, silica, calcium carbonate, magnesium carbonate, aluminum hydroxide, alumina, calcium phosphate, hydroxyapatite, zinc oxide and the like are used. Among them, organic particles are particularly preferable particles because they are easier to obtain a smoother surface than inorganic particles, are less likely to be caught when acting as rollers, and allow the thermal head to run smoothly.

The particle size of the substantially spherical particles 20 is 0.5 μm.
It is preferably m or more and 10 μm or less. If it is 0.5 μm or less, the substantially spherical particles 20b may be embedded in the peeling layer 20, and in the peeling layer 20, the action of the rollers may be less likely to occur. If it is 10 μm or more, the thermosensitive coloring layer 22 and The gap between the thermal head and the thermal head becomes large, and the thermosensitive coloring layer 22
This is because there may be a problem in causing the heat-sensitive coloring of the. In order for the mixed particles to function as a roller, it is desirable that the particles protrude from the surface of the peeling layer.
Considering the thickness, the particle size of the substantially spherical particles 20b is more preferably 1 μm or more and 7 μm or less. The substantially spherical particles have a substantially spherical shape, and the ratio of their major axis to their minor axis (major axis / minor axis) is preferably 1.7 or less, more preferably 1.3 or less. If it exceeds 1.7, the action as a roller may be difficult to expect.

The content of the substantially spherical particles 20b mixed in the release layer 20 is as follows.
Is preferably 10 parts by weight or more and 75 parts by weight or less with respect to 100 parts by weight. When the amount is 10 parts by weight or less, the printing quality of the printer may be deteriorated, and when the amount is 75 parts by weight or more, peeling from the lower pressure-sensitive adhesive layer 18 is difficult when wound as a continuous body of a non-separator type thermal recording label. May occur.

The release layer 20 includes a release agent matrix 20.
In addition to a and the substantially spherical particles 20b, various materials can be included. For example, in order to impart lubricity to the peeling layer 20, a lubricant such as fatty acid and metallic soap, the peeling layer 2
Powder particles of colloidal silica, alumina or the like are added to the release layer 20 to strengthen 0 or the like.

Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited to the examples.

[0024]

Examples 1 to 4 130 LHB thermal paper of Ricoh Co., Ltd. on which the thermosensitive coloring layer 22 was formed was used as the substrate 16, and an acrylic ester adhesive was used as the pressure-sensitive adhesive 18. The surface of the base material 16 on which the thermosensitive coloring layer 22 is formed is coated with a protective layer-forming coating liquid made of polyvinyl alcohol so that the coating amount after drying is 1.0 g / m ^2, and the protective layer 24 is coated. Was formed. Then, the peeling layer 20 was provided on the protective layer 24 as follows. The release layer 20 is made of a thermosetting silicone resin (Toray Dow Corning Silicone S
P7259) 100 parts by weight, platinum catalyst (Toray Dow Corning Silicone SRX212) 6 parts by weight, substantially spherical particles (particles of methyl methacrylate having an average particle size of 5 μm) x parts by weight (x = 0 to 50) The release layer-forming coating liquid is applied so that the coating amount after drying is 1 g / m ² ,
Then, the release agent was cured by heating with a heat curing device to form a release layer. Release layer 20 of substrate 16
The pressure-sensitive adhesive layer 18 is coated with an acrylic ester-based pressure-sensitive adhesive, which is a pressure-sensitive adhesive, so that the coating amount after drying is 20 g / m ² on the surface opposite to the surface on which is formed. Was formed.

In (Example 1) to (Example 4), a sample was printed by a direct thermal printer DP-360 (manufactured by Teraoka Seiko) under the conditions of a printing speed of 80 mm / sec and a duty of 49%. When the sticking property was examined, the results shown in Table 1 were obtained.

[0026]

[Table 1]

The evaluation of the test items was performed as follows. As the printer print quality evaluation, a three-stage evaluation of ◯, Δ, and × was performed. “O” as an evaluation represents a state in which printing is performed well. As for the evaluation “Δ”, a slight print fading is seen. The evaluation "x" indicates that the print is faint or missing.

As the sticking property evaluation, a three-stage evaluation of ◯, Δ, and × was performed. "O" as an evaluation indicates that no stick was recognized. “Δ” as an evaluation indicates that the stick is slightly recognized. "X" as an evaluation indicates that the stick is remarkable.

As is clear from Table 1, the addition of substantially spherical particles to the release layer is effective in preventing sticking and improves the print quality.

The present invention is not limited to the above example, but can be variously modified. For example, as shown in the no-separator type thermal recording label continuous body 10 shown in FIG. 3, the pressure-sensitive adhesive layer 18 is not formed on the entire back surface of each no-separator type thermal recording label 12, but You may make it provide the strip | belt-shaped blank part in which the pressure-sensitive adhesive layer 18 does not exist in the periphery of each non-separator type | mold thermosensitive recording label at fixed width. Further, a desensitizing agent that weakens the adhesive force of the pressure-sensitive adhesive layer 18, for example, a desensitizing agent containing powder such as titanium white or the like is applied to a certain width from the peripheral edge of each non-separator type thermal recording label 12. Alternatively, the belt-shaped desensitizer layer may be formed over the periphery of each non-separator type thermosensitive recording label 12.

[0031]

By including the substantially spherical particles 20b in the peeling layer 20, the substantially spherical particles 20b act as rollers, so that the contact between the thermal head and the surface of the peeling layer 20 becomes smooth and the thermal head The movement is smooth.
This is considered to contribute to the prevention of sticking.

[0032]

According to the present invention, even if there is no release paper, the release layer has releasability with respect to the pressure-sensitive adhesive layer to which it is joined, and the thermal head is used even when printing is performed by a printer. It is possible to provide a non-separator type heat-sensitive recording label and a continuous body of no-separator type heat-sensitive recording label which are excellent in head matching characteristics without causing a phenomenon of adhesion to the.

[Brief description of drawings]

FIG. 1 is a perspective view of a non-separator type thermal recording label continuous body according to an embodiment of the present invention.

FIG. 2 is a cross-sectional schematic view of a continuous body of a no-separator type thermal recording label according to an embodiment of the present invention.

FIG. 3 is an illustrative view showing one example of another label of the example shown in FIG.

[Explanation of symbols]

10 No-separator type thermal recording label continuum 12 No-separator type thermal recording label 14 Perforations 16 Base material 18 Pressure-sensitive adhesive layer 20 Release layer 20a release agent matrix 20b approximately spherical particles 22 Thermosensitive coloring layer 24 Protective layer 26 Printing layer 28 core tube

Claims (3)

[Claims] 1. A non-separator type thermosensitive recording label having a thermosensitive coloring layer and a peeling layer laminated on one side of a substrate and an adhesive layer on the other side of the substrate to prevent sticking. , Substantially spherical particles were mixed in the release layer,
Non-separator type thermal recording label and label continuum. 2. The non-separator type heat-sensitive recording label and label continuum according to claim 1, wherein the substantially spherical particles are organic particles. 3. The non-separator type heat-sensitive recording label and the label according to claim 1, wherein a part of the substantially spherical particles is projected from the surface of the release layer. Continuum.