JP2002129138A - Ink for formation of release layer and sheet using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ink which is low-cost, has high release performances, can readily form a release layer at a specified necessary site of a substrate by offset printing without using any special coater because of its excellent fitness to a printing ink, and does not need to be dried with a special drier after being applied to a substrate. SOLUTION: Use is made of an ink for release layer formation prepared by compounding porous microparticles with a vehicle mainly consisting of a glycol solvent having a boiling point of at least 100 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink for forming a release layer and a sheet having a release layer formed using the ink.

[0002]

2. Description of the Related Art Conventionally, a sheet having a release layer obtained by applying a release agent to a base material has been widely used as a recording sheet for release paper, adhesive tape, home delivery slips, and the like. Water-based inks (including emulsion-type inks), ultraviolet curable inks, and the like have been used, such as a fluorine-based release agent, an alkyl pendant-based release agent, and a long-chain alkyl-based release agent. However, there is a problem that silicone-based release agents and fluorine-based release agents are expensive and costly,
It is difficult to form a release layer on a predetermined part of the base material of the water-based ink, and it is difficult to partially process the base material. There was a problem that could happen.

[0003]

SUMMARY OF THE INVENTION It is a first object of the present invention to solve the conventional problems and to use a special coating device because it has low peeling cost, high peeling performance, and excellent printing ink suitability. In addition, it is an ink for forming a release layer at a required place on a substrate by offset printing or the like (partial printing or spot printing is possible). After printing, special drying An object of the present invention is to provide an ink for forming a release layer which does not need to be dried by an apparatus. A second object of the present invention is to provide a sheet having a release layer formed using the release layer forming ink.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, have used a vehicle mainly containing a specific solvent, and prepared an ink in which porous fine particles are blended with the vehicle. The present inventors have found that the problem can be solved by using the present invention, and have completed the present invention.

That is, the ink for forming a release layer according to the first aspect of the present invention is characterized in that porous fine particles are mixed with a vehicle containing a glycol solvent having a boiling point of 100 ° C. or higher as a main component. The release layer forming ink of the present invention in which porous fine particles are blended with a vehicle containing a specific solvent as a main component is low in cost, has good fixability to a substrate such as paper, and has high release performance. The exfoliation layer can be easily formed at a required portion of the base material by offset printing or the like without using a special coating device because of excellent printing ink suitability, and after printing, dried with a special drying device. No need.

The ink for forming a release layer according to a second aspect of the present invention is characterized in that a vehicle further containing a binder resin is used in the ink for forming a release layer according to the first aspect. Further, by blending the binder resin, the release layer formed on the base material becomes more resistant to rubbing, and even if rubbed, the porous fine particles do not separate, and the release layer does not peel off to the adhesive layer side.

A sheet according to a third aspect of the present invention has a release layer formed using the ink for forming a release layer according to the first or second aspect on a predetermined portion of at least one surface of the substrate. It is characterized by becoming.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The release layer forming ink of the present invention comprises:
It is important to use a vehicle mainly containing a glycol-based solvent having a boiling point of 100 ° C. or higher, and the vehicle is prepared by blending porous fine particles with the vehicle. The use of such a glycol solvent eliminates the need for a special drying device.

The glycol-based solvent used in the present invention is a medium- and high-boiling solvent (having a boiling point of 100 ° C. or higher) which can be mixed with water. Specifically, for example, glycol (glycerin, ethylene glycol, diethylene glycol, Triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol)
And glycol derivatives (ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, ethylene glycol monoethyl ether acetate, ethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate, diethylene glycol monoethyl acetate Butyl ether acetate), and mixtures of two or more thereof.

[0010] The porous fine particles used in the present invention are not particularly limited. Specific examples of the porous fine particles used in the present invention include, for example, Mizukasil P
-526, P-801, P-527, P-603, P8
32, P-73, P-78A, P-78F, P-87,
P-705, P-707, P-707D (manufactured by Mizusawa Chemical), Nipsil E200, E220, SS-10
F, SS-15, SS-50 (manufactured by Nippon Silica Industry Co., Ltd.),
For calcium carbonate fine particles such as SYLYSIA 730 and 310 (manufactured by Fuji Silysia Chemical Ltd.), Brillia
nt-15, Brilliant-S15, Unibu
r-70, PZ, PX, Tunex E, Vigot-1
0, Vigoto-15, Unifant-15FR,
Brilliant-1500, Homocal D, Gerton 50 (manufactured by Shiraishi Industry Co., Ltd.) and the like, and Sulfo-Calcium Aluminate microparticles, Sachin White SW, SW-B, S
W-BL (manufactured by Shiraishi Industry Co., Ltd.) and the like, and alumina fine particles such as AL-41G, AL-41, AL-42 and AL-4
3, AL-44, AL-41E, AL-42E, AL-
M41, AL-M42, AL-M43, AL-M44,
AL-S43, AM-21, AM-22, AM-25,
AM-27 (manufactured by Sumitomo Chemical Co., Ltd.), aluminum oxide C (manufactured by Nippon Aerosil Co., Ltd.), and titanium dioxide fine particles include titanium dioxide T805 and P25 (manufactured by Nippon Aerosil Co., Ltd.). These may be used alone or in combination of two or more.

The amount of the porous fine particles used in the present invention is not particularly limited, but is 5 to 60 parts by weight, preferably 1 part by weight, per 100 parts by weight of the vehicle.
It is desirable to mix 0 to 50 parts by mass. If the amount is less than 5 parts by mass, the releasability may not be improved, and if the amount is more than 60 parts by mass, the suitability for printing ink may be reduced.

In the present invention, a vehicle further containing a binder resin, if necessary, can be used. Further, by blending a binder resin, the formed release layer becomes more resistant to rubbing, and even if rubbed, the porous fine particles do not separate or the release layer does not peel off to the adhesive layer side, which is preferable.

The binder resin used in the present invention is not particularly limited as long as it can be used together with the glycol-based solvent. Specifically, for example, albumin, gelatin, casein, starch, gum arabic, natural resins such as sodium alginate, carboxymethyl cellulose, cellulose derivatives such as hydroxyethyl cellulose, polyamide, polyacrylamide, polyhydroxyethyl methacrylate, polyphenylacetoacetal, Polyethylene imine, polyvinyl pyrrolidone, polyvinyl pyridium halide, melamine resin, polyurethane, polyvinyl alcohol and its derivatives, polyester, polyacrylic acid soda, synthetic resin such as acrylate copolymer, dimethylamine / epichlorohydrin polycondensate, acrylamide Diallylamine copolymer, polyvinylamine copolymer, dicyandiamide, dimethyl
Cationic resin such as a compound containing diallyl ammonium chloride as a main component or a mixture of two or more of these, electron beam curable ink, ultraviolet curable ink, sulfonic acid group, carboxyl group, sulfate group,
Examples thereof include rosin-modified maleic acid and rosin-modified phenol resin having an anionic group such as a phosphate group.

Known additives can be added to the release layer forming ink of the present invention, if necessary. Examples of the additives include a crosslinking agent, an antioxidant, an ultraviolet absorber, a pigment, a dye, a lubricant, a foaming agent, a flame retardant, and a roll transferability improver such as glycerin.

The release layer forming ink of the present invention is applied to a predetermined portion of at least one surface of a substrate by a coating means such as a gravure coater, flexo, air knife coater, bar coater or the like, and a release paper having a release layer is provided. A recording sheet such as an adhesive tape or a home delivery slip can be formed.
In the present invention, no special drying device is required.

As the substrate used in the present invention, synthetic paper or a synthetic film of polyethylene, polyethylene terephthalate, polypropylene, vinyl chloride or the like having transparency can be used in addition to thermal paper and ordinary paper. When using these synthetic films, the surface of the substrate is preferably subjected to a surface treatment such as a mat treatment or a corona treatment. The coating amount of the ink on the substrate surface is not particularly limited, but is, for example, 0.5 to 30 g / m ² , preferably 3 to 20 g / m ² , and more preferably 5 to 15 g / m ² .
^{Assume 2} .

FIG. 1 is an explanatory view illustrating an embodiment of the sheet of the present invention. In FIG. 1, a sheet 1 of the present invention is shown.
The release layer 3 is formed at a predetermined position on the upper surface of the substrate 2 using the release layer forming ink of the present invention.

FIG. 2 is an explanatory view illustrating one application example of the sheet of the present invention shown in FIG. In the application example shown in FIG. 2, the sheet 1 of the present invention shown in FIG. 1 is used as release paper, and a label 5 having an adhesive layer 4 provided on the lower surface thereof is laminated via the adhesive layer 4 thereon. ing. When using the label 5, the sheet 1 of the present invention is peeled off, and the label 5 is adhered to another adherend via the adhesive layer 4.

FIG. 3 is an explanatory view showing another application example of the sheet of the present invention. The left end of the lower surface of the sheet 1 of the present invention can be re-attached and re-peeled through an anti-soak layer 6. It has an agent layer 4. The immersion treatment layer 6 and the adhesive layer 4 are
May be provided on the entire lower surface.

FIG. 4 is a perspective view showing an application example of the sheet 1 of the present invention shown in FIG. 3, and shows a sheet 1 having characters 7 and entry columns 8 printed on a release layer 3 using printing ink. Are laminated.

FIG. 5 is a sectional view taken along line VV of the message memo shown in FIG. A plurality of sheets 1 having a release layer 3 on the upper surface and an adhesive layer 4 that can be re-attached and re-peeled on the left end of the lower surface via an anti-soak layer 6 are sequentially laminated. It is integrated on the mount 9. The sheet 1 can be used for applications such as turning over and peeling off one sheet at a time, and attaching it to another adherend.

FIG. 6 is an explanatory view showing an example in which the sheet of the present invention is used for a home delivery slip. The delivery slip 10 is a protective layer for the sheet 1, the adhesive layer 4, the offset printed white printed layer 11, the 3-4 color offset printed design layer 12, and the design printed layer 12, in this order from the bottom. And a sheet 1A of the present invention in which a release layer 3 is formed on the lower surface of the thermal paper 2A. At the time of use, the sheet 1 of the present invention on the lower surface is peeled off and the delivery slip 10 is attached to a cardboard or the like, and then the sheet 1A of the present invention on the upper surface is peeled off. When the sheet 1A of the present invention is peeled off, the characters or illustrations on the design printing layer 12 on which the design printing is performed are visible with the white printing of the white printing layer 11 as a background.

[0023]

The present invention will be described in more detail with reference to the following Examples and Comparative Examples, but the present invention is not limited to these Examples. (Example 1) Polyethylene glycol (average molecular weight: 6)
00) 97 parts by mass of rosin-modified phenolic acid (trade name:
Tespol 1284 (manufactured by Hitachi Chemical Co., Ltd.)> 3 parts by mass are dissolved. To 100 parts by mass of the obtained vehicle liquid, 40 parts by mass of synthetic silica fine particles (trade name: SYLYSIA730 (manufactured by Fuji Silysia Chemical Ltd.)) are kneaded. To this, 7 parts by mass of diethylene glycol and 3 parts by mass of glycerin as a roll transferability improver were added and kneaded using a three-roll mill to prepare an ink for forming a release layer of the present invention.
Next, the obtained ink for forming a release layer according to the present invention was applied to a thermal paper <thermal paper 130LAB-1> using a resin relief printing plate.
(Manufactured by Ricoh Company)> Offset printing was performed on the back surface to 1.5 g / m ² to evaluate printability,
A sheet of the invention having a release layer was made. The peeling force of the obtained release layer of the sheet of the present invention was measured by the following peeling force measuring method. Table 1 shows the measurement results.

(Method of Measuring Peeling Force) First, a paper adhesive tape (25 mm in width) is placed on the surface of the peeling layer, and is adhered by reciprocating a 2 kg roller (50 mm in width) once. The sample to which the paper adhesive tape was adhered was left for 1 hour in an atmosphere at a temperature of 23 ° C. and a humidity of 50%, and then a small desktop material testing machine A was used.
Using GS-50A (manufactured by Shimadzu Corporation), the peeling force is measured at 180 ° peeling.

(Example 2) The peeling force was measured in the same manner as in Example 1 except that the polyethylene glycol used in Example 1 was changed to one having an average molecular weight of 300. Table 1 shows the results.

(Example 3) The peeling force was measured in the same manner as in Example 1 except that the polyethylene glycol used in Example 1 was changed to one having an average molecular weight of 200. Table 1 shows the results.

(Example 4) Hydrophobic synthetic silica fine particles (trade name: Nipsil) were used as the synthetic silica used in Example 1.
SS-50 (manufactured by Nippon Silica Industry Co., Ltd.)> The results of measuring the peeling force in the same manner as in Example 1 are shown in Table 1.

Example 5 The synthetic silica used in Example 1 was replaced with calcium carbonate fine particles (trade name: Brlian)
Example 15 except for changing to t15 (manufactured by Shiraishi Industry Co., Ltd.)
Table 1 shows the results of measurement of the peeling force in the same manner as described above.

Example 6 The synthetic silica used in Example 1 was replaced with titanium dioxide fine particles (trade name: titanium dioxide P25)
(Manufactured by Nippon Aerosil Co., Ltd.)> The peeling force was measured in the same manner as in Example 1 except that the result was changed to Table 1. The results are shown in Table 1.

Comparative Example 1 The peeling force of the thermal paper <Thermal Paper 130LAB-1 (manufactured by Ricoh Company)> used in Example 1 was measured in the same manner as in Example 1, and the results are shown in Table 1. .

(Comparative Example 2) Synthetic silica fine particles (trade name:
SYLYSIA730 (Fuji Silysia Chemical Ltd.)> 35
Mass part is UV varnish <Product name: Silver varnish (T & K
The mixture was kneaded with 100 parts by mass using a three-roll mill to obtain a UV-curable release layer forming ink for comparison. The obtained ink was subjected to dry offset printing (cured with a high-pressure mercury lamp) on thermal paper <Thermal Paper 130LAB-1 (manufactured by Ricoh)> using a resin relief printing plate at 1.5 g / m ² . Made a sheet for Table 1 shows the results of measuring the peeling force of the obtained sheet in the same manner as in Example 1.

Comparative Example 3 75 parts by mass of a rosin-modified phenol resin varnish and 14 parts by mass of linseed oil varnish were mixed.
7 parts by weight of wood wax (baltimic acid glyceride) and 4 parts by weight of a dryer were mixed. 35 parts by mass of synthetic silica fine particles (trade name: SYLYSIA730 (manufactured by Fuji Silysia Chemical Ltd.)) were added to the obtained varnish, and a release layer forming ink for comparison was prepared using a three-roll mill. The obtained ink was applied to a thermal paper <Thermal Paper 130LAB-1 (manufactured by Ricoh Company)> using a resin relief printing plate at 1.5 g / m ^2.
The sheet was subjected to dry offset printing (curing with a high-pressure mercury lamp) to obtain a sheet for comparison. Table 1 shows the results of measuring the peeling force of the obtained sheet in the same manner as in Example 1.

[0033]

[Table 1]

The inks for forming a release layer of Examples 1 to 6 have excellent printability, and Table 1 shows that they have an appropriate magnitude of release force and are excellent in release performance. At the time of peeling, the porous fine particles do not separate to the paper adhesive tape side, and the peeling layer does not peel. On the other hand, Table 1 shows that the peeling layer forming inks for comparison in Comparative Examples 1 to 3 have too large a peeling force and are inferior in peeling performance.

[0035]

The ink for forming a release layer according to claim 1 of the present invention solves various problems of the conventional ink for forming a release layer,
Uses special coating equipment because it is low-cost, has high peeling performance, and is excellent in printing ink suitability because it is an ink that contains porous fine particles in a vehicle containing a specific glycol-based solvent as a main component. In addition, a releasable layer can be easily formed on a required portion of the base material by offset printing or the like, and further, there is a remarkable effect that there is no need to dry with a special drying device after printing.

The system ink for forming a release layer according to the second aspect of the present invention is formed on a base material because a vehicle further containing a binder resin is used in the system ink for forming a release layer according to the first aspect. The peeling layer has a remarkable effect that the peeling layer becomes more resistant to rubbing, and even if rubbed, the porous fine particles are detached or the peeling layer is not peeled off.

The sheet according to claim 3 of the present invention has a release layer formed by using the release layer forming ink according to claim 1 or 2 on a predetermined portion of at least one surface of the substrate. It has a remarkable effect that, at low cost, it has high peeling performance, and even if the base material is thermal paper, it does not develop color due to heat from an ultraviolet device.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating an embodiment of a sheet of the present invention.

FIG. 2 is an explanatory view illustrating one application example of the sheet of the present invention shown in FIG.

FIG. 3 is an explanatory view showing another application example of the sheet of the present invention.

FIG. 4 is an explanatory view illustrating an application example of the sheet of the present invention shown in FIG.

FIG. 5 is a sectional view taken along line VV of the message memo shown in FIG. 4;

FIG. 6 is an explanatory diagram showing an example in which the sheet of the present invention is used for a home delivery slip.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1A Sheet of this invention 2, 2A base material 3 Release layer 4 Adhesive layer 5 Label 7 Character 8 Entry column 9 Mount 10 Delivery slip 11 White printing layer 12 Design printing layer 13 Medium layer

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Mitsuru Kawasome 1-6-6 Kanda Surugadai, Chiyoda-ku, Tokyo Toppan Forms Co., Ltd. F-term (reference) 4F100 AA20 AH02B AK00B AK33 AK54 AT00A BA02 BA07 DE01B DJ00B EH46 GB90 JL14 JL14B YY00B

Claims (3)

[Claims] 1. An ink for forming a release layer, wherein porous particles are blended with a vehicle containing a glycol solvent having a boiling point of 100 ° C. or higher as a main component. 2. The ink for forming a release layer according to claim 1, wherein a vehicle further containing a binder resin is used. 3. A sheet having a release layer formed using the ink for forming a release layer according to claim 1 or 2 on a predetermined portion of at least one surface of a substrate.