JP3446234B2 - Adhesive sheet - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive sheet for a page printer for PPC , which uses coated films as a surface substrate.

[0002]

2. Description of the Related Art Adhesive sheets are processed into labels, stickers, stickers, patches, etc., and are widely used for commercial, office, household and other purposes. The adhesive sheet is basically composed of a surface base material, an adhesive layer and a release base material.

Paper, film, metal foil or the like is used as the surface substrate. As the adhesive, a rubber type, an acrylic type, a vinyl ether type emulsion type, a solvent type,
There are various solventless adhesives. Then, as the release substrate, high-density paper such as glassine paper, clay-coated paper, undercoat paper such as resins, resin-laminated paper such as polyethylene, and film are coated with a release agent such as a silicone compound or a fluorine compound. Things are being used.

Among such pressure sensitive adhesive sheets, with the development of the information society, demand for pressure sensitive adhesive sheets for PPC printers and PPC copying machines for computer output and copying is expected. In particular, attention has been paid to the use of a film having strong water resistance as a surface base material or a synthetic paper using coated films in which a pigment coating layer having water resistance is provided.

Conventionally, as the pressure-sensitive adhesive sheet for this purpose, a pressure-sensitive adhesive sheet having a coated film as a surface substrate has been used for form printing, sticker printing, kanji printer, copying machine and the like. However, all of these coated film adhesive sheets have a quality design for winding,
Since it is not designed for PC page printers in flat format, static electricity generated inside the printer is a problem. Specifically, there are problems such as paper jams in the paper passing through the printer, stains on the paper passing roll, dirt on the printing, curls, and sticking of the sheets.

A general-purpose acrylic emulsion type adhesive has been used as the adhesive, but with this type of adhesive, the adhesive squeezes out when it passes through the heat roll of the PPC page printer, adheres to the roll, and becomes dirty on the roll. Problems such as are likely to occur.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a pressure-sensitive adhesive sheet having a water-repellent surface substrate, and more particularly to a pressure-sensitive adhesive sheet having improved problems such as paper-passing property, printability, stain and curl of a PPC page printer. provide.

[0008]

The present invention provides a pressure-sensitive adhesive sheet in which a surface substrate, a pressure-sensitive adhesive layer, and a release substrate are sequentially laminated,
The surface base material has a synthetic resin film or synthetic paper as a support, and a coating layer containing a pigment, an adhesive containing epoxy resin and a thermoplastic resin as main components, and a conductive agent, and a coating layer. PPC Paix smooster smoothness of 30～70CmHg, surface charge amount is equal to or less than 700V
It is an adhesive sheet for printers .

[0009]

The pressure-sensitive adhesive sheet of the present invention obtains suitability for use mainly in a PPC page printer by taking advantage of the characteristics of the surface substrate having good water resistance. Therefore, a synthetic resin film or synthetic paper is used as a support for the surface base material. Then, a coated layer having good water resistance containing a pigment, an adhesive and a conductive agent is provided on the surface of the support, and a coated synthetic resin film or coated synthetic paper is used as the surface base material. The coated surface of this surface base material has a smoother smoothness of 3
It is characterized in that the surface charge amount is specified to be 0 cmHg or more and the surface charge amount is 700 V or less.

When a film is used as the surface base material, static electricity is generated in the adhesive sheet as compared with the case where the surface base material is paper, and a paper jam at the time of passing the paper, a stain on the roll, a stain on the print,
Problems such as sticking of each sheet may occur. In addition, when the surface of the film is smooth, the PPC page printer causes scumming on the non-printed portion.

Therefore, the inventors of the present invention conducted a study to prevent the generation of static electricity and improve the background stain of the non-printed portion by providing a pigment coating layer on the surface of the support of films.

First of all, as the generation of static electricity and measures for preventing it,
It is considered that the surface electric resistance or the amount of surface charge of the pigment coating layer is reduced. The inventors of the present invention examined the surface charge amount, which is closely related to the paper passing property of the printer, as an index. In order to improve the suitability for a PPC page printer, the surface charge amount of the conventional antistatic degree cannot be sufficiently improved. In order to obtain a sufficient effect of suitability for a page printer, it is important that the surface charge amount is 700 V or less, and a larger amount of water-soluble polymer or conductive agent than the conventional level is required. However, when a large amount of a conductive agent or the like is used, the water resistance strength of the pigment coated layer decreases accordingly, and it becomes impossible to sufficiently impart the water resistance strength which is a characteristic of the coated films.

The inventors of the present invention have made extensive studies as to sufficiently reduce the amount of electrostatic charge on the surface and at the same time impart sufficient water resistance, and as a result, it has been found that a desired quality can be obtained by using a combination of an epoxy resin, a thermoplastic resin and a conductive agent. I found it.

Next, a study was conducted to improve the background stain on the non-printed portion of the PPC page printer. As a result, it was found that the background stain on the non-printing portion is caused by the residual toner on the non-toner portion of the printing drum portion. The sheet surface having good smoothness remarkably transfers the residual toner in the non-toner portion. In order to transfer only the toner part cleanly without transferring the residual toner in the non-toner part to the sheet, we examined what kind of state the smoothness of the sheet should have, and determined the surface smoothness of the coated film. It has been found that smoother smoothness of 30 cmHg or more is sufficient. It should be noted that even if the surface is roughened, it is possible to prevent scumming in the non-printed portion, but if the roughened surface has a smoother smoothness of more than 70 cmHg, the transfer of the toner in the original printed portion will be poor, which is not preferable.

The coated synthetic resin film or coated synthetic paper as the surface base material used in the pressure-sensitive adhesive sheet of the present invention has a surface charge amount reduced to 700 V or less as a static electricity prevention measure, and as a background stain prevention measure in a non-printed portion. A specific pigment coating layer that can maintain the surface smoothness at a smoother smoothness of 30 or more is provided. In order to obtain a desired amount of surface charge and surface smoothness and sufficient water resistance of the coating layer, it is necessary to use a pigment having a specific average particle size that can obtain the desired surface smoothness as a main pigment. Preferably, an adhesive mainly composed of an epoxy resin and a thermoplastic resin, which are excellent in water resistance, is important, and further, by forming a coating layer containing a conductive agent that reduces a desired surface charge amount, Can be achieved.

Further, in order to further reduce the generation of static electricity of the adhesive sheet, it is preferable to reduce the surface charge amount on the back surface side of the adhesive sheet structure. The back surface of the release base material is further subjected to resin laminating processing or resin coating processing in order to prevent curling. For PPC page printers, heat resistance is also required on the back surface side of the pressure-sensitive adhesive sheet, so it is preferable to perform heat-resistant resin coating for the back surface treatment of the release substrate.

However, the surface of a general resin coated surface is apt to increase in surface charge amount and is not suitable for a PPC page printer. The addition of a conductive agent is effective for reducing the surface charge amount on the resin surface, but the addition amount must be increased in order to obtain a sufficient surface charge amount. Addition of such a large amount of conductive agent lowers the water resistance strength of the resin layer, and the original effect of curling is impeded by the resin.

Regarding the addition of the resin and the conductive agent which reduce the surface charge amount without inhibiting the curl prevention effect, an acrylic acid ester copolymer obtained by copolymerizing 10 to 30% by weight of an ethylenically unsaturated carboxylic acid and a melting point are used. 50-100 ° C
It is effective to treat the back surface of the release substrate with a coating composition in which the wax of 2 to 40% by weight with respect to the copolymer is mixed with a conductive agent. Further, it is further preferable that the surface charge amount of the resin-treated surface composed of the resin and the conductive agent is 700 V or less.

The adhesive sheet of the present invention has an adhesive layer having a tensile strength (according to JIS K 6301) of 5 to 15 as an adhesive.
The range of kg / cm ² is preferable.

Each of the techniques of the present invention will be described more specifically below. The surface substrate in the present invention is a coated synthetic resin film or coated synthetic paper in which a synthetic resin film or synthetic paper is used as a support and a coating layer containing a pigment and an adhesive as a main component and a conductive agent is provided thereon. Is used. As the synthetic resin in this case, one having heat resistance is preferably used, and particularly, polyethylene terephthalate, polystyrene, polymethylmethacrylate, polycarbonate and the like are more preferable. A method of filling a pigment such as white pigment such as titanium oxide, calcium sulfate, silica, clay, talc, zinc oxide, etc., or whitening by providing fine foaming therein during the production of a film or synthetic paper as a support. It is possible to use the taken one. Alternatively, the coated surface of the synthetic resin support may be subjected to corona treatment, chemical treatment, or the like. The thickness of the support is generally 10
The thickness is adjusted in the range of about 500 μm, but is not limited to this range.

The pigment used in the coating layer provided on the support in the present invention is, for example, light calcium carbonate,
Aggregated structure calcium carbonate, ground calcium carbonate, kaolin, calcined kaolin, structural kaolin, talc, calcium sulfate, barium sulfate, titanium oxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, aluminum silicate, aluminum hydroxide, diatomaceous earth, Examples include inorganic pigments such as diatom magnesium, alumina and lithoponic acid, and organic fine particles such as plastic pigments and microcapsules.

Among these, in order to obtain a desired surface smoothness, those having a primary average particle diameter of the pigment or an average particle diameter of secondary aggregation of 2 to 10 μm are used in an amount of 50 parts by weight or more based on 100 parts by weight of the total pigment. It is preferable that If the pigment exceeds 50 parts by weight and the fine pigment is less than 2 μm, the smoothness of the coating layer becomes too good, and the smoother smoothness is 30 cmHg.
It becomes difficult to obtain the above-mentioned surface, and the residual toner in the non-printing portion of the PPC page printer is transferred to cause scumming. On the other hand, if the amount of the coarse-grained pigment exceeding 10 μm exceeds 50 parts by weight, it becomes difficult to obtain a surface having a smoother smoothness of 70 cmHg or less, and the transferability of the toner on the printing portion deteriorates, and the printability deteriorates.

In addition to obtaining the desired smoother smoothness with the above-mentioned pigment, there is also a method of improving the above-mentioned background stain by roughening the surface with, for example, a mat roll or sandblast. Since these methods add the adjustment of the surface charge amount by another method, P
As a surface substrate for a PC page printer, there are disadvantages in the manufacturing process. The present invention can simultaneously impart a number of properties required for a surface substrate for a PPC page printer at the time of coating a pigment.

In the coating layer of the present invention, an epoxy resin and a thermoplastic resin are particularly used as an adhesive constituting the coating layer together with the above pigment. Then, a conductive agent is further mixed with the pigment and the adhesive. By using these pigments, adhesives, and conductive agents in combination, toner adhesion does not occur, toner adhesion is good, printing density is high, and the water resistance strength, adhesive strength, etc. of the coating layer are appropriately maintained. . In addition, it is also a characteristic that it is a coated film and has characteristics similar to the appearance of PPC.

The epoxy resin used in the present invention is a compound having two or more highly reactive epoxy groups in the molecule, and a water-soluble epoxy compound produced by glycidylation of epichlorohydrin is preferably used. To be

Specific examples include glycols, di- or polyglycidyl ethers of aliphatic polyhydric alcohols, diglycidyl esters of dicarboxylic acids, and epoxy compounds having a nitrogen-containing heterocycle. Specific examples of these include ethylene. Glycol diglycidyl ether, diethylene glycol diglycidyl ether, triethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether [n = 5, 9, 13, 23, etc.],
Propylene glycol diglycidyl ether, dipropylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether [n = 3,7,11
Etc.], glycerol diglycidyl ether, glycerol triglycidyl ether, trimethylolpropane triglycidyl ether, diglycerol polyglycidyl ether, sorbitol polyglycidyl ether, succinic acid diglycidyl ester, adipic acid diglycidyl ester, diglycidyl dimethylhydanthrene, glycidyl There are trimethylammonium chloride, furfuryl glycidyl ether, trimethylolethane triglycidyl ether, 3-methylpentanetriol triglycidyl ether, glycerin ethylene oxide triglycidyl ether, etc. Of course, two or more of them may be used in combination.

The amount of the above epoxy resin used is preferably adjusted within the range of 1 to 20 parts by weight with respect to 100 parts by weight of the pigment constituting the coating layer. Actually, if it is less than 1 part by weight, the water resistance of the obtained coating layer is insufficient, while if it exceeds 20 parts by weight, the adhesion of the toner tends to decrease.

Specific examples of the thermoplastic resin used in combination with the epoxy resin include maleic anhydride resins, conjugated diene polymer latexes such as styrene / butadiene copolymers and methyl methacrylate / butadiene copolymers, and (meth). Acrylic polymer latex such as acrylate polymer or copolymer, vinyl polymer latex such as ethylene / vinyl acetate copolymer, functional group obtained by introducing functional group such as carboxyl group into these various polymers Examples include synthetic resin adhesives such as modified polymer latex, polymethylmethacrylate, polyurethane resin, unsaturated polyester resin, vinyl chloride / vinyl acetate copolymer, polyvinyl butyral, and alkyd resin.

The amount of the thermoplastic resin used is appropriately adjusted depending on the type of the thermoplastic resin and the type of the epoxy resin used together, but generally the pigment 100 constituting the coating layer is used.
About 2 to 45 parts by weight, preferably 5 to 3 parts by weight
It is adjusted within the range of about 0 parts by weight. If the total amount of the thermoplastic resin and the epoxy resin exceeds 50 parts by weight,
Since the adhesion of the toner tends to decrease, it is preferable to determine the combined amount of both in consideration of this point.

Specific examples of the conductive agent used in the present invention include the following. Inorganic electrolytes such as potassium chloride, calcium chloride, lithium chloride, magnesium chloride, sodium chloride, sodium sulfide and alum. Anionic surfactants such as sulfates, sulfonates, carboxylates, phosphates, alkylsulfonates, alkylallylsulfonates, naphthalenesulfonates, naphthalenedisulfonates, and salts of formalin condensates. Cationic surfactants such as alkylmethylammonium salt, alkyldimethylammonium salt, alkylbenzylammonium salt and alkylviridinium salt. Polyethers such as polyethylene glycol and polypropylene glycol, nonionic surfactants such as polyhydric alcohols. An amphoteric surfactant such as a compound having a long-chain aliphatic group, a quaternary ammonium type nitrogen and a carboxyl group or a sulfone group.
Metal oxides such as reduced titanium oxide, reduced potassium titanate, tin oxide-coated titanium oxide, tin oxide-coated mica, and tin oxide-coated potassium titanate.

In the present invention, the above-mentioned group is selected and used, but the one of the group has the conductive effect of the present invention, the stability of the coating liquid is good, and the amount used is large. Also, since the decrease in water resistance is small, it is preferably used. On the other hand, in the other groups, it is necessary to use a large amount in order to obtain the desired effects of the present invention, and it is difficult to obtain water resistance of the coating layer. The ones in the group of (3) and (4) have a problem in fluidity of the coating liquid due to the cationic property, and the amount used is limited. The ones in the group are very expensive due to the drawback of low whiteness.

Further, among the groups, anionic surfactants of sulfonate are preferably used, and particularly,
Alkyl sulfonate, alkyl allyl sulfonate,
Naphthalene sulfonate, naphthalene disulfonate,
And these derivatives are particularly preferred. The amount of the sulfonate conductive agent used in the coating layer must be selected and adjusted according to the conductive effect, that is, the amount of surface charge, and is in the range of 7 to 35 parts by weight with respect to 100 parts by weight of the pigment in the coating layer. It is preferably adjusted. If the amount is less than 7 parts by weight, the surface charge amount is 7
It is difficult to set the voltage to 00 V or less, and if it exceeds 35 parts by weight, water resistance becomes poor.

As described above, the coated films as the surface base material of the present invention have a coating layer surface charge amount of 700 V or less,
It is important that the voltage is more preferably 600 V or less.
When it exceeds 700V, various troubles occur due to static electricity. Further, although it is preferable that the surface charge amount is small, it is preferable to obtain a value of less than 100 V because the effect is not exerted more than this, and conversely, it may be difficult to impart water resistance. Absent.

Generally, as a measuring method for evaluating the easiness of generating static electricity, there are a surface specific electric resistance and a surface charge amount. The surface specific electric resistance is also simply called surface resistance, and the resistance value is measured by directly passing electricity through the object to be measured. On the other hand, the surface charge is charged by applying a high voltage to the measured object without contacting it.
Measure how much static electricity remains on the surface. Since the amount of surface charge is measured including the ease with which static electricity can escape,
In the case of the present invention, it is an excellent measuring method for evaluating the suitability for a PPC page printer. Static electricity troubles in PPC page printers occur when static electricity accumulates without escaping, and even if the generated static electricity is high, it does not become a problem if it decays quickly.

Incidentally, in the pigment coating liquid which forms the coating layer,
If necessary, various auxiliary agents such as a dispersant, a thickener, a flow modifier, a water resistance agent, an antifoaming agent, a foam suppressor, a release agent, a colorant, and a foaming agent may be appropriately added. .

A pigment coating layer is coated on a film support, and examples of coating machines include blade coaters, air knife coaters, roll coaters, brush coaters, curtain coaters, die coaters, bar coaters and gravure coaters. Ordinary coating machines such as a spray coater are appropriately used.

The coating amount of the pigment coating layer is generally 2 to 60 g.
/ M², Preferably 5 to 40 g / m ²Adjustable within a range
To be done. If the coating amount is too small, the ink absorption will be low.
If too much is added, the color developability deteriorates. Necessary
To enhance the adhesion between the support and the pigment coating layer according to
An intermediate layer may be provided.

As a method for drying the pigment coated layer, steam heating, hot air heating, gas heater heating, electric heater heating, infrared heater heating, high frequency heating, laser heating, electron beam heating and the like are appropriately used. Adjust the surface temperature according to the material. The coated films obtained by forming the coated layer on the support in this way can be used as they are, but the surface smoothness may be adjusted with, for example, a super calender or a gloss calender.

Examples of the release substrate used in the present invention include glassine type, clay coat, resin laminate, resin undercoat, and other papers or films coated with a release agent such as silicone. Then, in order to prevent curling of the pressure-sensitive adhesive sheet, a resin treatment layer is provided on the back surface of the release substrate.

The monomer constituting the acrylate ester copolymer used in the resin treatment layer for resin-treating the backside opposite to the release agent side of the release substrate of the present invention is butyl (meth) acrylate. , 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, stearyl (meth) acrylate, methyl (meth) acrylate, ethyl (meth) acrylate, styrene, α-methylstyrene, acrylic acid, methacrylic acid Acid, crotonic acid, itaconic acid, fumaric acid, maleic acid, vinyl acetate, acrylonitrile,
(Meth) acrylamide, N-methylolacrylamide, glycidyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, and (meth) acrylic acid-2-
Hydroxypropyl and the like can be mentioned.

Among the above monomers, it is necessary to copolymerize 10 to 30% by weight of ethylenically unsaturated carboxylic acid such as acrylic acid. When the copolymerization ratio is less than 10% by weight, the emulsion dispersion stability of the obtained copolymer is excluded, and a stable emulsion dispersion cannot be obtained. On the contrary, when it exceeds 30% by weight, The water resistance becomes poor, the water repellency also decreases, and the viscosity change due to the pH change of the copolymer is remarkable, which deteriorates the coating suitability.

The emulsion copolymer is usually prepared by an emulsion polymerization method in which a water-soluble polymerization initiator is polymerized in the presence of a surfactant and / or an oligomer having a surface-active property or a water-soluble polymer substance. Done by. The surfactant is appropriately selected by combining at least one kind of anionic, nonionic or cationic surfactant. Further, the water-soluble polymerization initiator is also an initiator used for ordinary radical polymerization, for example, persulfate such as ammonium persulfate, potassium persulfate or sodium persulfate, hydrogen peroxide, t-butyl hydroperoxide, etc. Inorganic or organic peroxides can be used. At that time, a reducing substance, for example, sodium metabisulfite sodium salt, sodium bisulfite sodium salt, or longalitic acid sodium salt is combined with the water-soluble polymerization initiator to use a radical polymerization initiator system by oxidation-reduction reaction. A so-called redox polymerization method in which emulsion polymerization is performed can also be applied.

On the other hand, another component of the resin-treated layer of the release base material of the present invention is a wax having a melting point in the range of 50 to 100 ° C., a paraffin wax,
Microcrystalline waxes and intermediate product waxes are included, especially mixtures of paraffins and microcrystalline waxes. Then, at least one kind of these waxes is used as a mixture, and usually this is used as an emulsion using an anionic surfactant and / or a nonionic surfactant.

The mixing ratio of the above-mentioned copolymer and the above wax in the constituent components of the resin treatment layer of the release substrate of the present invention is 2 to 40 parts by weight of wax based on 100 parts by weight of the solid content of the copolymer. Parts, more preferably 5 to 30 parts by weight. If the proportion of this wax is less than 2 parts by weight, the effect of water resistance is small. On the other hand, if the amount exceeds 40 parts by weight, the stability of the emulsion becomes unstable and layer separation occurs during long-term storage. In addition, the adhesiveness to the release base material and the adhesiveness also deteriorate, resulting in durability. However, it becomes difficult to maintain water resistance.

The above-mentioned wax emulsion and the above-mentioned conductive agent are added to the acrylic ester copolymer obtained as described above to carry out the back surface treatment of the release base material. Regarding the method, a usual coating machine such as a roll coater, a bar coater, an air knife coater, a blade coater, a spray coater and an impregnation coater can be used. The surface charge amount of the backside resin treatment layer is preferably adjusted to 700 V or less as in the case of the above-mentioned front surface base material.

In the method for producing the pressure-sensitive adhesive sheet of the present invention, the pressure-sensitive adhesive layer is formed, for example, by coating the pressure-sensitive adhesive on a release substrate and drying it. The adhesive layer has a tensile strength of 5 to 15 kg (according to JIS K 6301).
The range of / cm ² is preferable. The adhesive layer having a tensile strength in this range is such that when the adhesive sheet is die-cut by a foam printing machine or a sticker printing machine, the adhesion of the adhesive to the cutting blade is suppressed, or from the fold line when the sewing machine is folded. The sticking out of the pressure sensitive adhesive is extremely effectively suppressed. Of course, even in the intended use, there is no protrusion of the adhesive and PP
Excellent suitability can be exhibited even with a C page printer.

The above-mentioned specific pressure-sensitive adhesives used in the present invention include ethylenically unsaturated carboxylic acid-containing monomers, C ₄ -C ₁₈ alkyl ester monomers of (meth) acrylic acid, and these monomers. And a copolymer with another monomer copolymerizable with.

Examples of the ethylenically unsaturated carboxylic acid-containing monomer constituting the (meth) acrylic acid ester copolymer include acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid, monoalkyl maleic acid, mono Examples thereof include alkyl itaconic acid and monoalkyl fumaric acid.

Other monomers copolymerizable with the above-mentioned monomers constituting the (meth) acrylic acid ester copolymer include, for example, methyl (meth) acrylate, ethyl (meth) acrylate, Propyl (meth) acrylate, cyclohexyl (meth) acrylate, methoxyethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, glycidyl (meth) acrylate, vinyl acetate, vinyl propionate, vinyl chloride, vinylidene chloride, Styrene, divinylbenzene, ethylene, (meth) acrylonitrile, (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-butoxymethyl (meth)
Examples thereof include acrylamide and N, N-methylenebis (meth) acrylamide. The proportion of these other copolymerizable monomers in the copolymer is 10 to 50 of all the monomers.
It is adjusted in the range of% by weight.

The pressure-sensitive adhesive used in the method of the present invention is usually 3,000 to 8 by means such as adjustment of the molecular weight of acrylic acid ester, dilution with water or an organic solvent, or thickening.
The viscosity is adjusted to about 000 centipoise and coating is performed. As the coating machine, for example, a roll coater, a knife coater, a bar coater, a slot die coater or the like is used.

The amount of the adhesive applied to the substrate is 5 to dry weight.
It is desirable to adjust it in the range of about 50 g / m ² . If this coating amount is less than 5 g / m ² , the adhesive strength of the adhesive layer surface of the resulting adhesive sheet is not sufficient, and if it exceeds 50 g / m ² , the adhesive may stick out or peel off during lamination of the adhesive sheet. It causes cohesive failure at the time.

[0052]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. The coating amount, the number of parts, the mixing ratio, and the like in the examples are all shown in parts by weight of solid content and% by weight.

Example 1 [Production of surface base material] Heavy calcium carbonate having an average particle diameter of 5 μm (trade name: Whiten SB / manufactured by Bihoku Kouka Co., Ltd.) 70
Part, titanium oxide (trade name: EP 498 White /
0.5 part of sodium polyacrylate was added to 30 parts of Dainichiseika Kogyo Co., Ltd., and mixed and dispersed by a stirrer to prepare a pigment slurry having a solid content concentration of 70%. Epoxy resin (trade name: PC-
1000 / manufactured by Nagase Kasei Co., Ltd., 4 parts of methylmethacrylate / butadiene copolymer latex (trade name: P-OX)
55P / Sumitomo Dow) 15 parts, conductive agent sodium alkylallyl sulfonate (trade name: Chemistat 6120)
(Manufactured by Sanyo Kasei Co., Ltd.) and other auxiliary agents were added, and the mixture was adjusted to a solid content concentration of 53% with water to prepare a pigment coating liquid. This coating liquid was applied to one side of a polyethylene terephthalate film (trade name: T-600E / manufactured by Diamond Foil Hoechst) having a thickness of 50 μm and the dry weight was 15 g.
/ M ² was coated with a bar coater and dried with a hot air dryer at 60 ° C. for 30 seconds to obtain a coated synthetic resin film.

[Production of Release Base Material] 100 parts of ion-exchanged water, 1.5 parts of sodium dodecylbenzenesulfonate, 3.5 parts of polyoxyethylene nonylphenyl ether, and 0.5 parts of ammonium persulfate were placed in a stainless steel reaction vessel.
Dissolve 5 parts and then add lauryl methacrylate 5
Parts, butyl acrylate 65 parts, ethyl acrylate 9 parts,
30 parts of an emulsified monomer mixed liquid prepared by mixing 9 parts of methyl methacrylate and 12 parts of acrylic acid was charged, and the mixture was mixed in a nitrogen stream to obtain 7 parts.
Polymerization was initiated by raising the temperature to 5 to 80 ° C. After 30 minutes, the remaining emulsified monomer mixture was added dropwise at the same temperature over 3 hours to complete the polymerization.

Thereafter, the mixture was cooled to 30 ° C., 1.2 parts of 28% ammonia water and 5 parts of ion-exchanged water were added, and p
It was adjusted to H7.2. The acrylic ester copolymer emulsion obtained here had a concentration of 51% and a viscosity of 350.
It was cps.

Next, with respect to 100 parts of the above emulsion, a wax emulsion (trade name: CARBOMUL P
-212 / Dick Hercules Co., Ltd.) 20
Part, conductive agent (trade name: Chemistat 6120 / manufactured by Sanyo Kasei Co., Ltd.) 10 parts, defoaming agent (trade name: Nopco 1407)
-K / manufactured by San Nopco Co., Ltd.) 1 part was added to obtain a back surface treatment liquid for a release substrate.

[0057] coated with a bar coater to a dry weight on one surface of the above coated liquid fine paper of Beitsubo 74 g / m ² and is 8 g / m ^2, and dried. On the other hand, a low-density polyethylene resin (trade name: Mirason SP-16 / Mitsui Petrochemical Co., Ltd.) was laminated on the opposite surface with a T-die to a thickness of 20 μm to obtain a release base paper. Further, a silicone release agent (trade name: KS-770 / manufactured by Shin-Etsu Chemical Co., Ltd.) was applied to this polyethylene surface with a bar coater so that the dry coating amount was 0.5 g / m ^2, and the release group was dried. I got the material.

[Production of pressure-sensitive adhesive sheet] An acrylic emulsion pressure-sensitive adhesive (product name:
Nicazole TS-1215, tensile strength 12.0 kg / c
m ² / manufactured by Nippon Carbide Co., Ltd.) was coated with a reverse roll coater to a dry coating amount of 20 g / m ² and dried. Then, the surface base material was overlaid on the pressure-sensitive adhesive layer and bonded by a press roll to manufacture a pressure-sensitive adhesive sheet.

Example 2 In the production of the surface base material, the average particle diameter of the pigment is 9.0.
A pressure-sensitive adhesive sheet was obtained in the same manner as in Example 1 except that 70 parts of μm ground calcium carbonate (trade name: BF-100 / manufactured by Bihoku Powder Co., Ltd.) was used.

Example 3 In the production of the surface base material, the pigment has an average particle diameter of 2.5.
μm heavy calcium carbonate (trade name: Softon 1800
A pressure-sensitive adhesive sheet was obtained in the same manner as in Example 1, except that 70 parts of Bikita Koka Co., Ltd.) was used.

Example 4 An average particle size of 5 μm was used as a pigment in the production of a surface base material.
An adhesive sheet was obtained in the same manner as in Example 1 except that 55 parts of heavy calcium carbonate, 25 parts of titanium oxide, and 20 parts of kaolin (product name: UW-90 / EMC) were used.

Comparative Example 1 In the production of the surface base material, the pigment has an average particle size of 1.0.
μm heavy calcium carbonate (trade name: Hydrocarb K
-6 / Bihoku Kouka Co., Ltd.) Example 1 except that 70 parts were used
An adhesive sheet was obtained in the same manner as in.

Example 5 A pressure-sensitive adhesive sheet was obtained in the same manner as in Example 1 except that 20 parts of a conductive agent was used in the production of the surface base material.

Example 6 A pressure-sensitive adhesive sheet was obtained in the same manner as in Example 1 except that 30 parts of a conductive agent was used in the production of the surface base material.

Example 7 In the production of the surface base material, the conductive agent was polyethylene glycol (trade name: Toho polyethylene glycol # 30).
0 / manufactured by Toho Chemical Industry Co., Ltd.) An adhesive sheet was obtained in the same manner as in Example 1 except that 10 parts were used.

Comparative Example 2 A pressure-sensitive adhesive sheet was obtained in the same manner as in Example 1 except that 5 parts of a conductive agent was used in the production of the surface base material.

Example 8 A pressure-sensitive adhesive sheet was prepared in the same manner as in Example 1 except that 80 μm polypropylene synthetic paper (trade name: YUPO FPG-80 / Oji Yuka Co., Ltd.) was used as a film in the production of the surface substrate. Obtained.

Example 9 [Production of Release Base Material] Acrylic ester copolymer emulsion containing 25% of wax (trade name: X-591)
394E-2 / made by Saiden Chemical Co., Ltd.) 100 parts, conductive agent sodium alkylallyl sulfonate (trade name: Chemistat SA-9 / made by Sanyo Kasei Co., Ltd.) 20 parts, defoaming agent (trade name: Nopco 1407-K / 1 part (manufactured by San Nopco Co., Ltd.) was added to obtain a back surface treatment liquid for a release substrate.

The above-mentioned back surface treating liquid for release base material
dry weight on one surface of woodfree paper g / m ² is coated with a bar coater so that the 10 g / m ^2, and dried. On the opposite side, low density polyethylene resin (trade name: Shorex L
-182 / Showa Denko KK) was laminated with a T-die to a thickness of 25 μm to obtain a release base paper. Furthermore, a silicone release agent (trade name:
SRX-211 / Toray Down Corning Silicone Co., Ltd.) was coated with a gravure coater so that the dry coating amount was 0.5 g / m ^2, and dried to obtain a release substrate.

[Production of Adhesive Sheet] Next, an acrylic emulsion adhesive (trade name: Olivain BPW-5082-2, tensile strength 8.
A pressure-sensitive adhesive sheet was obtained in the same manner as in Example 1 except that 0 kg / cm ² / Toyo Ink Mfg. Co., Ltd. was used.

Example 10 A pressure-sensitive adhesive sheet was obtained in the same manner as in Example 9 except that 2 parts of the conductive agent of the back surface treatment liquid for release sheet was used in the production of the pressure-sensitive adhesive sheet.

Performance of the pressure-sensitive adhesive sheet thus obtained was evaluated by the following evaluation methods, and the results are shown in Table 1. [Surface smoothness] The coated surface of the surface base material was measured with a smoother smoothness meter (manufactured by Toei Denshi Kogyo KK). The smaller the value, the better the smoothness. (Unit: cmHg) [Surface electrification amount] A voltage of 6 KV was applied to the coated surface of the surface base material and the back surface of the release base material using STATIC HONESTMETER (manufactured by Sind Static Electric Co., Ltd.) at a temperature of 2
In the state of 0 ° C. and relative humidity of 50%, the charge amount V after 1 minute of charging was measured. The smaller the value, the smaller the electrification amount and the less paper passing troubles caused by static electricity. [Paper Alignment After Passing Paper] The pressure-sensitive adhesive sheet was cut into A4 size, and the ease of paper alignment after passing printing was manually evaluated by a page printer L-580 manufactured by Kyocera. ◯: Easy paper alignment. Δ: Paper alignment is difficult to some extent but practically no problem. X: It is difficult to align the paper and there is a problem in practical use. [Background stain] The pressure-sensitive adhesive sheet was cut into A4 size, and the amount of toner adhered to the non-printed portion after the paper was passed through a Kyocera page printer L-580 was visually evaluated. ◯: Good because there is almost no adhesion of toner on the non-printed portion.
Δ: Adhesion of toner to the non-printed portion is recognized to some extent, but it is within a practically acceptable range. X: Toner adheres to the non-printed portion, which is a problem in practical use. [Curl] The pressure-sensitive adhesive sheet was cut into A4 size, and the state of curl of the pressure-sensitive adhesive sheet after passing printing on a page printer L-580 manufactured by Kyocera was visually evaluated. ◯: Good with almost no curl. Δ: There is some curl, but there is no practical problem. [Water resistance] After immersing the pressure-sensitive adhesive sheet in water for 24 hours, the coated surface of the surface base material was rubbed with the finger head 10 times to evaluate the falling state of the coated layer. ◯: The coating layer is not removed at all and is strong. Δ: The coating layer was slightly removed, but there was no problem in practical use.

[0073]

[Table 1]

[0074]

As is clear from the results shown in Table 1, the pressure-sensitive adhesive sheet of the present invention is easy to align with paper, scumming, curling, water resistance,
It had excellent quality characteristics that were well balanced in all evaluations.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI D21H 19/44 D21H 19/44 G09F 3/02 G09F 3/02 E (56) References JP-A-4-46980 (JP, A) ) JP-A-1-260094 (JP, A) JP-A-2-158332 (JP, A) JP-A-4-293984 (JP, A) JP-A-4-234473 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) B32B 1/00-35/00 B41M 5/00 C09J 7/02 D21H 19/00-19/84 G09F 3/02

Claims (5)

(57) [Claims] 1. A facestock, pressure-sensitive adhesive layer, the adhesive sheet and the release substrate sequentially stacked, the surface substrate is a synthetic resin film or synthetic paper as a support, on which a pigment
When the adhesives based on epoxy resin and a thermoplastic resin, conductive agent and has a coated layer containing a smoother smoothness of the coating layer is 30～70CmHg, and <br PP having a surface charge amount of 700 V or less
C page adhesive sheet for printers . Wherein said coated layer has an average particle size 2~10μm
Pressure-sensitive adhesive sheet according to claim 1, containing at least 50 parts by weight of pigment relative to the total pigment 100 parts by weight. 3. A conductive agent is an alkyl sulfonate of the coating layer, alkylaryl sulfonates, naphthalene sulfonate, naphthalene sulfonate, and at least one selected from among these derivatives, the coating The pressure-sensitive adhesive sheet according to claim 1, which is contained in an amount of 7 to 35 parts by weight based on 100 parts by weight of all pigments in the layer. 4. The pressure-sensitive adhesive sheet according to claim 1, wherein the support of the surface base material is at least one selected from polyethylene terephthalate, polystyrene, polymethylmethacrylate, and polycarbonate. 5. The release base material has a resin treatment layer on the back surface, and the resin treatment layer comprises an ethylenically unsaturated carboxylic acid 10
The 30% contain copolymerized allowed acrylic acid ester copolymer, and 2 to 40% by weight relative to the copolymer melting point 50 to 100 ° C. of the wax, a conductive agent and a, the resin treated layer The pressure-sensitive adhesive sheet according to claim 1, which has a surface withstand voltage of 700 V or less.