JP2745455B2 - Vehicle for aqueous stamp ink, aqueous stamp ink and stamp stand - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle for an aqueous stamp ink, an aqueous stamp ink using the same, and a stamp base using the aqueous stamp ink.

[0002]

2. Description of the Related Art Conventionally, stamp stands have been widely used for stamping rubber stamps. The stamp stand is provided with an ink reservoir made of felt, sponge, etc. on a base, and the ink reservoir absorbs stamp ink.
Various sizes and shapes are known.

[0003] Among these stamp stands, a stamp stand using an aqueous stamp ink containing a pigment or a water-soluble dye is used for a wide range of applications because of good ink permeability when imprinted on paper or the like. ing.

Various water-based stamp inks are known. Among them, typical water-based stamp inks include glycerin, ethylene glycol, diethylene glycol, propylene glycol and the like in order to impart water retention. Moisturizers composed of various glycols, Ink penetrates quickly when stamped on paper, and surface activity of polyoxyethylene alkyl ether, polyoxyethylene allyl ether, etc. to improve wettability to rubber stamped surface Adds water-soluble resin, polymer substance, thickener and other viscosity-imparting agents to give viscosity to inks and inks, and water, and if necessary, adds to preservatives, fungicides, etc. As a pigment, an ink in which a pigment or a water-soluble dye is dissolved has been used.

[0005]

The conventional water-based stamp ink having the above composition can be used without any problem when used on a stamp base using fine felt as an ink reservoir. However, it has been difficult to use a stamp table using a sponge as an ink storage body.

[0006] That is, the aqueous stamp ink using the humectant consisting of glycerin or glycols, a surfactant, a viscosity imparting agent, etc., can prevent the ink from drying due to the action of each compounding component. To have
It is preferably used for a stamp base using a fine felt, but if it is absorbed into an ink reservoir using a coarse sponge compared to the felt, the viscosity is low for use in a sponge, and Due to the low thixotropic properties (the nature of the ink being held in the ink reservoir), the ink flows out of the ink reservoir. for that reason,
Increasing the amount of paste such as starch as a viscosity-imparting agent increases the viscosity and prevents the ink from flowing out. However, when it is imprinted on paper, the ink penetrates poorly, and disadvantages such as difficulty in drying occur.

Furthermore, inks using water-soluble dyes have the disadvantage that the dyes are dissolved in the form of salts, so that the paste affects the salts of the dyes and deteriorates the quality of the ink.

Further, in the conventional aqueous pigment-based ink using a water-dispersible pigment, particularly when a pigment having a large specific gravity, for example, titanium oxide, is used, the pigment is liable to settle and a separation phenomenon is likely to occur. was there.

The present invention has been made in view of the above-mentioned conventional water-based stamp inks, and provides a new water-based stamp ink in which the disadvantages have been improved. It does not use it, it gives an appropriate viscosity to the ink, has excellent thixotropy, and can be suitably used not only when using fine felt as an ink reservoir, but also on a stamp base using a sponge. A water-based stamp ink vehicle, a water-based stamp ink, and a stamp base using the water-based stamp ink, which improve the dispersibility of the pigment, prevent precipitation, have excellent spreadability on the rubber stamp surface, and have good permeability to paper. It is intended to provide.

[0010]

That is, the present invention provides glycerin and / or glycols in an amount of 30 to 70 wt.
Part , polyglycerin represented by the following general formula (I) and charcoal
An aqueous stamp ink vehicle comprising 20 to 40 parts by weight of a polyglycerol monofatty acid ester comprising a fatty acid having 8 to 20 element atoms and 60 parts by weight or less of water.

[Outside 1] (In the formula, n represents an integer of 4 to 8.)

The present invention also relates to the above-mentioned aqueous stamp-in.
An aqueous stamp ink containing a vehicle for pigment and a pigment or a water-soluble dye.

Further, the present invention is a stamp stand characterized in that the above-mentioned water-based stamp ink is absorbed in an ink reservoir provided on a base.

Hereinafter, the present invention will be described in detail. The aqueous stamp ink of the present invention is obtained by dissolving a coloring agent comprising a pigment or a water-soluble dye in a vehicle for an aqueous stamp ink.

The aqueous stamp ink vehicle used in the aqueous stamp ink of the present invention is characterized in that it does not use a viscosity-imparting agent such as a paste used in conventional inks. The basic composition of the vehicle is that the composition contains a specific polyglycerin monofatty acid ester and water, or a composition containing glycerin and / or glycols and a specific polyglycerin monofatty acid ester and water. Features.

Glycerin and / or glycols act as humectants for imparting water retention to the ink. The glycols are not particularly limited, and those used in ordinary aqueous stamp inks can be used, and preferred examples include ethylene glycol, diethylene glycol, propylene glycol, and polyethylene glycol.

Next, the polyglycerin monofatty acid ester is used to impart viscosity of the ink, adjust the viscosity, adjust the surface tension to increase the permeability to paper, and to maintain the ink in the ink storage well. It acts to impart thixotropic properties.

As the polyglycerol monofatty acid ester, a monofatty acid ester of polyglycerin represented by the following general formula (I) and a fatty acid having 8 to 20 carbon atoms is used.

[0018]

Embedded image

In the polyglycerol represented by the above general formula (I), n represents an integer of 4 to 8, preferably 4
It is. When n is less than 4, the effect of the fatty acid which forms an ester bond becomes large, and the insoluble in water or glycerin.
Exceeds 8, it is not preferable because the viscosity becomes extremely high.

The fatty acid is a saturated or unsaturated fatty acid having 8 to 20 carbon atoms, preferably 8 to 20 carbon atoms.
-18 fatty acids are preferred. When a fatty acid having less than 8 carbon atoms is used, it is difficult to impart thixotropic properties to the ink, and when a fatty acid having more than 20 carbon atoms is used, it becomes insoluble in water or glycerin, which is not preferable.

Specific examples of the fatty acid include caprylic acid, lauric acid, oleic acid, and stearic acid.

The polyglycerol monofatty acid ester may be any one in which a fatty acid is ester-bonded to any one of the hydroxyl groups of polyglycerin represented by the general formula (I). A compound represented by the following general formula (II) is exemplified.

[0023]

Embedded image (R represents C ₁₁ H ₂₃ CO—)

In the present invention, glycerin and / or glycols act to prevent the drying of the ink on the surface of the ink reservoir, and its content is 0 to 90 parts by weight.
Preferably 30 to 70 parts by weight, more preferably 30 to 70 parts by weight.
50 parts by weight is desirable.

In the present invention, glycerin and glycols can be appropriately selected according to the purpose of use, and glycerin may be used alone, or glycerin and glycols may be used in combination. When glycerin and glycols are used in combination, the composition of the aqueous stamp ink vehicle may be 20 to 70 parts by weight of glycerin, 5 to 2 parts of glycols.
0 parts by weight, polyglycerol monofatty acid ester 10-4
It preferably contains 0 parts by weight and 60 parts by weight or less of water.

The content of polyglycerol monofatty acid ester is usually 10 to 90 parts by weight, preferably 10 to 60 parts by weight, more preferably 20 to 40 parts by weight.
Exceeding the weight part is not preferred because the viscosity is too high.

The water content is usually 60 parts by weight or less, preferably 5 to 20 parts by weight. Further, other additives can be added to the vehicle for aqueous stamp ink of the present invention as needed, and examples thereof include a fungicide, a preservative and the like.

Next, the aqueous stamp ink of the present invention contains the above-described vehicle for aqueous stamp ink and a pigment or a water-soluble dye as a coloring agent. The pigment or water-soluble dye is not particularly limited, and those used in ordinary aqueous stamp inks can be used, and the content thereof is 0.5 to 50 parts by weight based on 100 parts by weight of the vehicle. Parts by weight, preferably 0.5 to 40 parts by weight.

The method for preparing the aqueous stamp ink of the present invention comprises the steps of preparing a specific amount of polyglycerin monofatty acid ester and water, or a specific amount of glycerin and / or
Alternatively, a glycol, a polyglycerin monofatty acid ester and water are mixed and stirred to prepare an aqueous stamp ink vehicle, and a pigment or a water-soluble dye is gradually added to the aqueous stamp ink vehicle while stirring to dissolve or dissolve. It can be performed by a dispersing method. The stirring is preferably performed using a homogenizer or a high-speed mixer.

Next, the aqueous stamp ink of the present invention is used by being housed in a stamp base. The stamp stand of the present invention
The above water-based stamp ink is absorbed in an ink reservoir provided on a base. The stamp base for storing the aqueous stamp ink is not particularly limited, and may be any commonly used one. FIG. 1 is a cross-sectional view showing an example of a stamp base according to the present invention, in which a water-based stamp ink is absorbed by a normal method on a stamp base provided with an ink reservoir 2 made of sponge or felt on a base 1. is there.

In particular, the water-based stamp ink of the present invention has good thixotropy and is well retained even on a stamp base using a sponge for the ink storage.
Ink does not flow out of the ink reservoir even after long-term use.

The aqueous stamp ink vehicle of the present invention can provide a good aqueous stamp ink in which the pigment is prevented from being separated from a pigment-based aqueous stamp ink using an aqueous pigment. That is, in the case of an aqueous pigment-based ink, particularly in the case of a pigment having a large specific gravity, the pigment is likely to settle, and a so-called separation phenomenon is likely to occur. In particular, in the case of a white pigment (titanium oxide, TiO ₂ ), the specific gravity is considerably large, and it has been difficult to prevent sedimentation with a conventional vehicle. However, when the vehicle for an aqueous stamp ink of the present invention is used, even when titanium oxide is used as a pigment, the dispersion is stabilized by imparting appropriate thixotropic properties.

In the pigment-based ink, titanium oxide plays a very important role, and it is necessary to add a large amount of titanium oxide to form a series of so-called pastel colors such as pink and sky blue. Therefore, by using titanium oxide in a wide range of content, it is possible to greatly increase the types of ink colors. In a conventional vehicle, it was almost impossible to add and separate a large amount of titanium oxide. However, the vehicle for aqueous stamp ink of the present invention can be used without separation.

In the aqueous stamp ink of the present invention, the viscosity can be freely adjusted by adjusting the amount of polyglycerin monofatty acid ester contained in the aqueous stamp ink vehicle. Also, the spreadability of the ink on the soft plastic stamped surface is good, and the permeability to paper is good.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on embodiments.

Example 1 A vehicle for an aqueous stamp ink was prepared by blending the following components. Vehicle for aqueous stamp inks Hexaglycerin monolaurate 26 parts by weight Hexaglycerin monooleate 13 parts by weight Glycerin 40 parts by weight Water 21 parts by weight

Next, 29 parts by weight of TiO ₂ and 3 parts by weight of phthalocyanine blue as a pigment were dispersed with respect to 100 parts by weight of the above-mentioned vehicle using a homogenizer to obtain a pigment-based sky blue aqueous stamp ink.

The viscosity of the obtained aqueous stamp ink (25
° C), thixotropy, and permeability to paper are shown in Table 1.

Further, the aqueous stamp ink was absorbed into a stamp table using a sponge (latex sponge) as an ink reservoir and stored upright at room temperature for 30 days, but the ink did not flow out of the sponge. Was.

Further, no separation phenomenon between the pigment and the vehicle occurred. This water-based stamp ink had excellent spreadability on a new rubber stamp surface and a plastic (soft vinyl chloride) stamp surface, and when printed on paper, a clear image was obtained.

Comparative Example 1 A vehicle for aqueous stamp ink was prepared by blending the following components. Vehicle glycerin for aqueous stamp ink 60 parts by weight Ethylene glycol 6 parts by weight Polyoxyethylene alkyl ether 0.3 parts by weight (surfactant) Paste (dextrin) 8 parts by weight Water 25.7 parts by weight

Next, 8 parts by weight of phthalocyanine blue as a pigment was dispersed in 100 parts by weight of the above-mentioned vehicle using a homogenizer to obtain an aqueous stamp ink.
The viscosity (25 ° C.) of the obtained aqueous stamp ink is 50 c
ps. The thixotropy was 1.0 (no thixotropic).

The water-based stamp ink was absorbed into a stamp table using a sponge (latex sponge) as an ink reservoir. However, when the ink was stored upright at room temperature for 2 days, the ink leaked from the sponge.

In addition, the phenomenon of separation between the pigment and the vehicle was clearly observed. This water-based stamp ink was repelled by a new rubber stamp and a plastic (soft vinyl chloride) stamp, and was unclear when stamped on paper.

Example 2 A vehicle for aqueous stamp ink was prepared by mixing the following components. Vehicle for aqueous stamp inks Hexaglycerin monolaurate 24 parts by weight Hexaglycerin monooleate 24 parts by weight Glycerin 52 parts by weight

Next, a dye-based red aqueous stamp ink was obtained by dissolving 5 parts by weight of neucoccin (Red No. 102) as a dye using a homogenizer with respect to 100 parts by weight of the above vehicle.

The viscosity of the obtained aqueous stamp ink (25
° C), thixotropy, and permeability to paper are shown in Table 1.

Further, the aqueous stamp ink was absorbed into a stamp table using a sponge (latex sponge) in the ink reservoir and stored upright at room temperature for 30 days, but the ink did not flow out of the sponge. Was. This water-based stamp ink had excellent spreadability on a new rubber stamp surface and a plastic (soft vinyl chloride) stamp surface, and when printed on paper, a clear image was obtained.

Example 3 A vehicle for an aqueous stamp ink was prepared by mixing the following components. Vehicle for aqueous stamp inks Hexaglycerin monolaurate 15 parts by weight Hexaglycerin monooleate 15 parts by weight Glycerin 32 parts by weight Diethylene glycol 6 parts by weight Water 32 parts by weight

Next, brilliant blue FCF (edible blue 1) was used as a dye with respect to 100 parts by weight of the vehicle.
No.) 4 parts by weight were dissolved using a homogenizer to obtain a dye-based blue aqueous stamp ink.

The viscosity of the obtained aqueous stamp ink (25
° C), thixotropy, and permeability to paper are shown in Table 1.

Further, the aqueous stamp ink was absorbed into a stamp table using a sponge (latex sponge) in the ink reservoir and stored upright at room temperature for 30 days, but the ink did not flow out of the sponge. Was. This water-based stamp ink had excellent spreadability on a new rubber stamp surface and a plastic (soft vinyl chloride) stamp surface, and when printed on paper, a clear image was obtained.

Measurement method (1) Viscosity Using an E-type viscometer, the external circulating thermostat was set at 25 ° C., and the viscosity was measured while changing the rotation speed of the rotor.

(2) Thixotropy A viscosity at a predetermined rotor rotation speed and a viscosity at a rotor rotation speed five times the selected rotation speed were selected from the measured values of the viscosity (1), and the values were calculated by the following equation. .

[0055]

(Equation 1)

(3) Penetration into paper The ink was spread while pressing on a copy paper using a standard metal spatula, rubbed with a finger, and expressed in time (seconds) until rubbing did not occur.

[0057]

[Table 1]

[0058]

As described above, according to the present invention, an appropriate viscosity is imparted to an ink without using a viscosity-imparting agent such as a paste as in a conventional ink, and the ink has excellent thixotropic properties. Not only when felt is used as the storage material, but also when used on a stamp base using a sponge, ink does not flow out, improving the dispersibility of the colorant pigment and preventing sedimentation. An aqueous stamp ink having excellent spreadability and good permeability to paper can be obtained.

Further, according to the stamp stand of the present invention, even if a sponge is used for the ink reservoir, use of the above-mentioned water-based stamp ink allows the ink to be used for a long time without ink spill or separation of the pigment. be able to.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an example of a stamp base according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 2 Ink storage body 3 Lid body

Claims (4)

(57) [Claims] 1. Glycerin and / or glycols
30 to 70 parts by weight of a poly ( vinyl alcohol ) represented by the following general formula (I)
An aqueous stamp containing 20 to 40 parts by weight of a polyglycerin monofatty acid ester composed of glycerin and a fatty acid having 8 to 20 carbon atoms, and 60 parts by weight or less of water. Vehicle for ink. Embedded image (In the formula, n represents an integer of 4 to 8.) 2. Glycerin and / or glycols
30 to 70 parts by weight of a poly (vinyl alcohol) represented by the following general formula (I)
Glycerin and a fatty acid having 8 to 20 carbon atoms
20-40 parts by weight of glycerin mono fatty acid ester and
A vehicle containing not more than 60 parts by weight of water and water, a pigment or
A water-based stamp containing a water-soluble dye
ink. Embedded image (In the formula, n represents an integer of 4 to 8.) 3. The aqueous stamp ink according to claim 2, wherein the content of the pigment or the water-soluble dye is 0.5 to 50 parts by weight based on 100 parts by weight of the vehicle. 4. A ink collection body provided on the base, according to claim 2
A stamp base characterized by absorbing the aqueous stamp ink described in the above.