JPH11106715A - Adhesive sheet for printing and printing sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sheet which can be unrolled smoothly from a rolled shape while printing heat transfer information on it and gives the resultant printing sheet which is easily stuck to a material-to-be-stuck-to by forming a releasing- layer-to-be-printed made up of a polyethylene wax on one side of a supporting base material and an adhesive layer without a separator on the other side. SOLUTION: A releasing-layer-to-be-printed 1 comprises a polyethylene wax having a molecular weight of 500-50,000 and another wax having a molecular weight of 100-6,000. The printing sheet consists of the releasing-layer-to-be- printed 1, a supporting base material 2 and an adhesive layer 3. The information layer 4 is made up of a heat fixing ink given on the releasing-layer-to-be-printed 1 by heat transfer. The printing sheet is stuck to a material-to-be-stuck-to 5 through the adhesive layer 3 which is formed on the other side of the supporting base material 2. The thickness of the releasing-layer-to be-printed is preferably 0.01-10 μm. The thickness of the supporting base material, which is determined by its purpose, is preferably 10-100 μm generally. An acrylic adhesive or the like is used for the adhesive layer.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive adhesive sheet for printing which can be wound into a wound body without a separator covering the pressure-sensitive adhesive layer, and which can be printed on-site by giving thermal transfer information on the spot.

[0002]

2. Description of the Related Art Heretofore, there has been known an adhesive sheet for thermal transfer printing, in which an adhesive layer is provided on one surface of a film substrate, and the adhesive layer is covered with a separator to form a roll. However, the separator is an unnecessary product such as dust when the thermal transfer information is added to the printing adhesive sheet and the printing sheet is put to practical use, and the separator is flexible and difficult to peel off from the adhesive layer because it is formed of a thin film. There was a point.

[0003] In the above, without a separator covering the adhesive layer, it becomes difficult to rewind the wound body, chatter or curl occurs, or it is adhered to a progressive mechanism or the like in a thermal transfer printer to form a printing sheet. Is difficult to use, and the quality such as sharpness of printing by thermal transfer is inferior.
Further, the obtained printing sheet is curled and handling properties are remarkably reduced. On the other hand, when a release coat is provided on the surface of a film substrate according to a pressure-sensitive adhesive sheet without a separator, the ink pops out, making it difficult to fix the ink to the substrate, and thus cannot be used as a printing sheet.

[0004]

SUMMARY OF THE INVENTION The present invention provides a wound body without a separator for covering an adhesive layer, and the wound body is smoothly rewound through a thermal transfer printer or the like, and heat transfer information composed of a heat-fixable ink is used. To develop a printing adhesive sheet that can easily issue a printing sheet with clear information on site, etc., and that can easily adhere the obtained printing sheet to an adherend via the adhesive layer. And

[0005]

According to the present invention, there is provided a pressure-sensitive adhesive for printing, comprising: a support base material having a release-target printable layer made of at least polyethylene wax on a surface thereof and a pressure-sensitive adhesive layer on the back surface without a separator. An object of the present invention is to provide a sheet and a printing sheet characterized in that the release layer of the pressure-sensitive adhesive sheet for printing has thermal transfer information composed of a heat-fixable ink.

[0006]

According to the pressure-sensitive adhesive sheet for printing of the present invention, the pressure-sensitive adhesive layer can be adhered to the releasable printing layer on the back surface of the sheet and can be easily rewound as a roll. It can be attached to a general-purpose thermal transfer printer and can give clear thermal transfer information while smoothly rewinding. The formed print sheets can be sequentially taken out and easily fixed to the adherend via the adhesive layer on the back surface of the print sheet.

Accordingly, a linerless type pressure-sensitive adhesive sheet for printing that can eliminate the need for a separator for the pressure-sensitive adhesive layer cover, which is unnecessary when the printing sheet is put into practical use, can save resources and is excellent in practicality. It is possible to form and issue a print sheet excellent in quality such as clarity of added information on the spot or the like on the spot.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The pressure-sensitive adhesive sheet for printing according to the present invention comprises a support base material having a release-target printable layer made of at least polyethylene wax on the surface and a pressure-sensitive adhesive layer on the backside without a separator. . Examples thereof are shown in FIGS. 1 is a release printing layer, 2 is a support substrate, and 3 is an adhesive layer.

FIG. 1 shows a printed sheet, and reference numeral 4 denotes an information layer made of a heat-fixable ink applied to the releasable print-receiving layer 1 by a thermal transfer method. Reference numeral 5 denotes an adherend, and the printing sheet is fixed to the adherend 5 via an adhesive layer 3 provided on the back surface of the support substrate 2.

The pressure-sensitive adhesive sheet for printing may be a sheet-like material in which at least the release layer 1 and the pressure-sensitive adhesive layer 3 made of polyethylene wax are exposed on the front and back surfaces of the sheet. Therefore, the pressure-sensitive adhesive sheet for printing can be formed in an appropriate sheet form. Incidentally, as an example, as shown in FIG. 1, a form in which a releasable printed layer 1 and an adhesive layer 3 are attached to the front and back of a support base material 2, and as shown in FIG.
In addition to the form composed of 1, 32 superposed layers, the form in which the releasable print-receiving layer is impregnated into the support base and these are compositely integrated, the form in which the support base is composed of a plurality of superposed layers, etc. can give.

The releasable print-receiving layer is made of at least polyethylene so that the ink can be fixed by a thermal transfer method and that when the adhesive layer is adhered without a release coat, it can be easily peeled off without generating a strong adhesive force. It is formed using wax. The polyethylene wax which can be preferably used from the viewpoint of stable unwinding property and ink fixing property in the case of a wound body or the like has a molecular weight of 500 to 50,000, preferably 700 to 30,000, particularly 800 to 10,000. is there.

In the formation of the releasable printed layer, a wax other than polyethylene wax can be used in combination for the purpose of lowering the adhesive strength with the adhesive layer. Other types of wax that can be preferably used from the viewpoint of lowering the adhesive strength, etc., have a molecular weight of 100 to 600.
0. The type of the other wax is not particularly limited, and for example, a general wax such as a carnauba-based, paraffin-based, or amide-based wax can be used.

The amount of the other wax is preferably 5,000 parts by weight or less, more preferably 5 to 2,000 parts by weight, particularly preferably 10 to 500 parts by weight, per 100 parts by weight of the polyethylene wax from the viewpoint of the releasability of the adhesive layer.

A release agent may be added to the releasable print-receiving layer together with or without the above-mentioned other wax for the purpose of lowering the adhesive strength with the adhesive layer. As the release agent, an appropriate adhesive known as a silicone-based, long-chain acryl-based, or fluorine-based adhesive tape can be used. The compounding amount of the release agent is preferably 10 parts by weight or less, more preferably 1 to 8 parts by weight, particularly preferably 2 to 6 parts by weight, per 100 parts by weight of the polyethylene wax from the viewpoint of the releasability of the adhesive layer and the ink fixing property.

Further, the releasable printed layer may contain appropriate additives such as reinforcing agents such as fibers, coloring agents such as white pigments, and antioxidants. The amount of the additive can be appropriately determined, but is usually 50% by weight or less, preferably 40% by weight or less, and particularly preferably 30% by weight or less from the viewpoint of clear printability. In addition, measures as necessary, such as improvement of contrast with the information to be provided, may be applied to the supporting base material.

The formation of the releasable printed layer can be carried out, for example, by coating or impregnating a support base material with wax in the form of a solution or a melt in an appropriate manner. The thickness thereof is 0.01 to 10 μm, preferably 0.0
It is preferably from 5 to 5 μm, particularly preferably from 0.1 to 2 μm.

The surface of the releasable printed layer is preferably smooth from the viewpoint of easy rewinding of the wound body and the ability to provide thermal transfer information. 1μ
m or less, particularly preferably 0.4 μm or less.

The support substrate used for the purpose of supporting and reinforcing the releasable printed layer and the adhesive layer includes resin coating layers and films, fibers and cloths, paper and nonwoven fabrics, metal foils and nets, wires and the like. An appropriate one can be used. Physical properties such as heat resistance of the supporting substrate may be appropriately determined according to the purpose of use,
For example, a support substrate made of a heat-resistant polymer such as polyester, polyimide, fluororesin, or polyamide may be used.

The supporting base material may be composed of a multi-layered material such as a laminate of the above-mentioned materials or a composite, and need not be a single-layered material. The physical properties of the pressure-sensitive adhesive sheet for printing or the printing sheet can be easily controlled by selecting the supporting substrate.

The thickness of the supporting substrate may be appropriately determined according to the form, the purpose of use of the pressure-sensitive adhesive sheet for printing, and the like. Generally, from the viewpoint of the supportability and strength of the releasable printed layer and the pressure-sensitive adhesive layer, the applicability to a thermal transfer printer, etc., particularly the applicability as a wound body, it is 500 μm or less, especially 5 to 300 μm, especially 1
The thickness is 0 to 100 μm.

The pressure-sensitive adhesive layer provided on the back surface of the supporting base material is used for easily adhering to an adherend when a printed sheet or the like is formed. For forming the adhesive layer, for example, a rubber-based adhesive or an acrylic-based adhesive, a silicone-based adhesive or a vinylalkyl ether-based adhesive, a polyvinyl alcohol-based adhesive or a polyvinylpyrrolidone-based adhesive, a polyacrylamide-based adhesive, or a cellulose-based adhesive An appropriate adhesive such as an adhesive can be used.

Low adhesiveness to the release printable layer, and therefore, ease of rewinding when the roll is adhered to the backside release printable layer without a separator covering the adhesive layer, Adhesive layer preferable from the viewpoint of the stability of adhesion and fixation to the adherend, acrylic, silicone, polyester,
It is formed using one or more urethane-based or polyamide-based pressure-sensitive adhesives.

Automatic mold rewinding through a general-purpose thermal transfer printer, etc., that is, rewinding that does not cause chatter, etc., and clear printability, and harmony in adhesion to the adherend. The preferred adhesion between the printing layer and the adhesive layer is
1500gf / 100mm based on 5m / min rewind speed
Hereinafter, especially 1 to 1000 gf / 100 mm, particularly 5 to 800 gf
gf / 100 mm.

As shown in FIG. 2, the pressure-sensitive adhesive layer is of a different kind for the purpose of improving the adhesion to the adherend in the case of a printed sheet or the like while maintaining a low adhesive force to the releasable print-receiving layer 1. Two or more adhesive layers 3 by combination of adhesives
It can also be formed as 1, 32 superposed layers. In this case, for forming the inner pressure-sensitive adhesive layer 31, a pressure-sensitive adhesive exhibiting strong adhesive strength can be preferably used.

The pressure-sensitive adhesive layer is formed by providing the pressure-sensitive adhesive layer on the separator by an appropriate method such as a rolling method such as a calender roll method, or a coating method such as a doctor blade method or a gravure roll coater method, and supporting the same with a support base. It can be carried out by an appropriate method such as a method of transferring onto a predetermined surface of a material or a method of applying an adhesive on a predetermined surface of a supporting base material. The superposition of the adhesive layer can also be performed according to the above.

The thickness of the pressure-sensitive adhesive layer is determined from the viewpoints of low adhesive strength to the release-receiving printing layer and suitability as a printing sheet when mounted on a general-purpose thermal transfer printer such as a commercial product.
1 to 300 μm, especially 2 to 100 μm, especially 5 to 50 μm
It is preferable that

The pressure-sensitive adhesive sheet for printing according to the present invention is capable of forming a printed material such as a printing sheet by applying a known printing method to the releasable print-receiving layer. Thus, the printing process can be automatically performed in the same manner as the conventional printing sheet. At the time of attachment to a printer or the like, in addition to a sheet state, a wound state in which an adhesive layer is adhered to a releasable print-receiving layer on the back surface may be used.

In the above case, when a printed material is formed by a printer of a thermal transfer type or the like, an appropriate ink sheet to which the heat fixing ink is applied can be used. It is preferable to form thermal transfer information using an ink sheet to which a heat-fixable ink containing an agent as a component is applied.

According to the above, information which is excellent in fixability, abrasion resistance and solvent resistance by good fusion-compression bonding between polyolefins in the heat-releasable ink of the ink sheet and the releasable print layer of the pressure-sensitive adhesive sheet for printing. This makes it possible to form a high-quality print sheet excellent in clarity and the like by providing thermal transfer information to the release printing layer of the pressure-sensitive adhesive sheet even in a general-purpose thermal transfer printer.

As the heat fixing ink, those containing at least a polyolefin and a colorant as components can be preferably used from the viewpoint of fixing property and durability. The polyolefin has a viscosity-average molecular weight of 10 from the viewpoint of the heat melting property or the ink transfer-compression property by a thermal transfer printer.
Polyethylene, polypropylene, ethylene-propylene copolymer, and the like having 0,000 to 300,000, especially 1,000 to 200,000, particularly 5,000 to 100,000 are preferable.

Colorants include, for example, organic and inorganic pigments,
Conventional materials such as carbon and metal powder may be used. Incidentally, examples of the coloring agent include azo pigments and phthalocyanine pigments, triphenylmethane pigments and metal complex salt pigments, vat dye pigments and quinacridone pigments, organic pigments such as isoindolinone pigments, silica and the like. White substances such as titania, alumina and zinc white, zirconia and calcium oxide, mica, red substances such as manganese oxide / alumina, chromium oxide / tin oxide, iron oxide, cadmium sulfide / selenium sulfide, cobalt oxide, zirconia / vanadium oxide, Blue material such as chromium oxide / divanadium pentoxide, black material such as chromium oxide / cobalt oxide / iron oxide / manganese oxide / chromate, permanganate, zirconium / silicon / praseodymium / vanadium / tin / chromium
Typical examples thereof include inorganic substances such as yellow substances such as titanium / antimony, green substances such as chromium oxide and cobalt chromium, and alumina / chromium, and pink substances such as aluminum / manganese and iron / silicon / zirconium.

The ink is, for example, 100 parts by weight of one or more polyolefins and 50 to 1000 colorants.
Heating the parts by weight with a suitable kneading machine such as a roll mill or mixing with a suitable kneading machine such as a roll mill or a pot mill using a polyolefin-soluble solvent as necessary to obtain a paste-like fluid. Can be prepared.

In the case of forming an ink sheet such as a print ribbon, which is necessary for forming a pattern by a thermal transfer method, the ink is held on a base material such as a film or cloth by an appropriate method such as an application method or an impregnation method. Can be formed. As the base material, customary materials such as a plastic film such as polyester, polyimide and fluororesin, and a cloth made of fibers such as polyamide and polyester may be used. For improving the adhesion of the ink layer, a method of undercoating the base material with wax or the like is effective.

In forming a printed material such as a printing sheet,
Arbitrary information such as a print pattern, a picture pattern, and a bar code pattern may be added.However, in the case of forming an identification label, a good contrast or color difference is formed between the printing adhesive sheet and the ink information. Preferably. The obtained printed matter may be subjected to a heat treatment of the imparted information via a heat roll or the like for the purpose of stronger fixing.

The formed printed matter can be fixed to an adherend via an adhesive layer of the adhesive sheet for printing. At the time of fixing, heat treatment may be performed via a heat roll or the like for the purpose of stronger fixing. Therefore, the heat treatment can also serve as fixing of the information.

The printed matter according to the present invention can be provided with various types of articles such as ceramics, glass products, ceramic products and metal products, enamel products and resin products, wood products and paper products, and the like. It can be preferably used for various purposes such as labeling or other information. The adherend may be in any form, such as a flat form or a container form.

[0037]

【Example】

Example 1 A polyethylene layer having a thickness of 18 μm formed by extrusion lamination on one side of a high-quality paper having a basis weight of 81.4 g / m ² was coated with 100 parts (weight part, hereinafter the same) of polyethylene wax having a molecular weight of 2000 and 500 molecular weight. 50 parts of paraffin wax is dissolved in 1000 parts of hot toluene, and a cooled solution is applied through a kiss coater and dried to form a releasable print layer having a thickness of 0.5 μm. An acrylic pressure-sensitive adhesive having a solid content of 30% by weight is applied to the surface through a fountain coating machine and dried to form a pressure-sensitive adhesive layer having a thickness of 30 μm, thereby obtaining a pressure-sensitive adhesive sheet for printing. The roll was wound by a method in which an adhesive layer was adhered to the print layer to obtain a roll.

Next, 100 parts of polyethylene having a viscosity average molecular weight of about 8,000 and 100 parts of carbon powder were added to form about 200 parts.
C., and the uniform dispersion was applied on a 4.5 μm-thick polyester film at a thickness of 1.2 μm using a hot-melt gravure coater, and a commercially available ink sheet was loaded. The wound body obtained above was mounted on a thermal transfer printer, and the ink was thermally transferred to the releasable print-receiving layer to perform printing to obtain a print sheet.

Example 2 100 parts of polyethylene wax having a molecular weight of 1000 and a molecular weight of 5 were formed on a white polyester film having a thickness of 50 μm.
100 parts of carnauba wax was dissolved in 1000 parts of hot toluene, and a cooled solution was applied through a kiss coater and dried to form a releasable print layer having a thickness of 0.5 μm. On the other side, an acrylic pressure-sensitive adhesive layer was formed in accordance with Example 1 to obtain a roll of a pressure-sensitive adhesive sheet for printing, which was mounted on a commercially available thermal transfer printer, and was subjected to a releasable coating via a commercially available wax-based ink ribbon. Printing was performed by transferring the ink to the printing layer by heat transfer to obtain a printing sheet.

Comparative Example A pressure-sensitive adhesive sheet for printing was obtained and a printed sheet was formed in the same manner as in Example 1 except that the release-target printing layer containing no polyethylene wax was used.

Evaluation Test The following characteristics were examined for the pressure-sensitive adhesive sheet for printing or the printed sheet obtained in the examples and comparative examples. Unwinding adhesive strength 25 rolls of a printed pressure-sensitive adhesive sheet formed to a width of 100 mm
The film was rewound at a speed of 5 m / min at a temperature of ° C, and the force required for the rewound at that time was examined.

Chattering (Rewinding Property) It was examined whether or not chattering occurred when the printed adhesive sheet was rewound through the thermal transfer printer when the print sheet was formed. Chattering is a phenomenon in which the rewinding speed becomes slow and does not become constant, and when chattering occurs, the adhesive sheet for printing is plastically deformed and a fold mark is generated, thereby causing a defective print sheet.

Printability The print condition on the print sheet, particularly its sharpness, was examined.

The results are shown in the following table. *: Measurement is not possible due to large fluctuation

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an example of a printed sheet.

FIG. 2 is a cross-sectional view of another example of an adhesive sheet for printing.

[Explanation of symbols]

 1: release printing layer 2: support substrate 3: adhesive layers 31, 32: adhesive layer 4: information layer 5: adherend

Claims (6)

[Claims] 1. A pressure-sensitive adhesive sheet for printing, comprising a releasable printing layer made of at least polyethylene wax on the surface of a support substrate and a pressure-sensitive adhesive layer on the back surface without a separator. 2. The release-target printed layer according to claim 1, wherein the releasable print-receiving layer is a polyethylene wax having a molecular weight of 500 to 50,000 and a molecular weight of 1 or more.
A pressure-sensitive adhesive sheet for printing containing another kind of wax of from 00 to 6000. 3. The pressure-sensitive adhesive sheet for printing according to claim 1, wherein the releasable printed layer contains a releasable polymer in a dispersed state. 4. The printing pressure-sensitive adhesive sheet according to claim 1, wherein the pressure-sensitive adhesive layer is made of an acrylic, silicone, polyester, urethane or polyamide pressure-sensitive adhesive. 5. A printing sheet, wherein the releasable printed layer of the pressure-sensitive adhesive sheet for printing according to claim 1 has heat transfer information composed of a heat-fixable ink. 6. The printing sheet according to claim 5, wherein the thermal transfer information is composed of a heat-fixable ink containing a polyolefin and a colorant as components.