JPH06102392B2 - Thermal transfer ink ribbon for dry transfer material manufacturing - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a thermal transfer ink ribbon used in the production of a dry transfer material, and more particularly to a thermal transfer type printer,
Using a typewriter, word processor, etc., it is possible to transfer and print onto the basic sheet surface such as a film with poor wettability and strong peelability, and at the same time, transfer image (ink image) obtained by heat-sensitive transfer to the basic sheet surface. ) Relates to a heat-sensitive transfer ink ribbon for producing a dry transfer material, which can be effectively pressure-sensitively retransferred onto an object to be transferred by pressure.

(Prior Art and Problems Thereof) In recent years, printing devices such as printers, typewriters, and word processors by a thermal transfer system have been developed and are widely used for small personal use to business use. Printing by this thermal transfer method is
The thermal transfer ink ribbon is brought into close contact with a predetermined printing paper by the thermal head, and a desired heating element among the many heating elements of the thermal head is caused to generate heat so that the thermal transfer ribbon is brought into contact with the heating element through the support of the thermal transfer ribbon. This is done by melting the part of the hot-melt ink that is present and transferring it to the printing paper.

This type of thermal transfer ribbon has conventionally been prepared by only coating a predetermined support with a hot-melt ink composed of a colorant and a binder agent thereof, and the binder agent mainly contains wax. It was a thing. Moreover, this type of thermal transfer ribbon is intended only for normal paper as a transfer target.

By the way, the present inventors have previously described a thermal transfer ink ribbon for the purpose of enabling transfer and printing to a basic sheet surface such as a film having good wettability and good releasability / removability. Japanese Patent Application No. 61-275538 (see Japanese Patent Publication No. 5-28678), Japanese Patent Application No. 61-275539 (see Japanese Patent Application Laid-Open No. 63-128991), Japanese Patent Application No. 62-85350 (Japanese Patent Application Laid-Open No. 63-85). Japanese Patent Application No. 62-80126 (Japanese Unexamined Patent Publication No. Sho 6-80126).
3-246280).

Thus, in the conventional thermal transfer apparatus, when the ribbon is wound up, the ribbon is pulled out according to the movement of the head due to the frictional force between the ink surface of the ribbon and the paper that is the transfer target, and there is slack in the ribbon. This is done by winding the ribbon. However, the surface of a film having poor wettability and good releasability and releasability is
Due to the low coefficient of friction, the force to pull out the ribbon is weak, and therefore when the force required to pull out the ribbon from the cassette is large, the ribbon is not fed completely and the head prints at the same location on the ribbon. The state (slip) occurs and printing becomes impossible. On the other hand, in order to prevent this phenomenon, on the contrary, if the force required to pull out the ribbon from the cassette is reduced, then the running of the ribbon becomes unstable and the ribbon meanders. In addition, the ribbon pull-out force is greatly different immediately after the ink is applied and after a few days have passed, and also when it is stored at 55 ° C and the environmental temperature changes. Therefore, it is very difficult to achieve ribbon running without meandering or slipping while taking into consideration storage stability and aging.

Under such circumstances, no report has been made so far regarding an ink ribbon that simultaneously solves the above problems of storage stability and ribbon running property.

(Object of the Invention) Here, the present invention has been made in view of such circumstances, and the first object thereof is to transfer heat to a basic sheet surface of a film or the like having poor wettability. A second object of the present invention is to provide an ink ribbon (transferred image) transferred onto a base sheet by heat sensitivity. The pressure from behind makes it easy and complete,
Another object of the present invention is to provide a heat-sensitive transfer ribbon that can be pressure-sensitively transferred to an object to be transferred.

Furthermore, a third object of the present invention is to provide an ink ribbon for producing a dry transfer material having good storage stability, and a fourth object of the present invention is to provide a dry transfer having good ribbon running property. An object is to provide an ink ribbon for manufacturing a material.

(Solution) In order to achieve the above object, the present invention configures an ink ribbon for producing a dry transfer material so as to have the following features. That is, a transfer image of a desired character or figure is thermally transferred onto a base material sheet by a thermal transfer method, and the ink image on the base material sheet is pressed from the surface opposite to the surface on which the ink image is thermally transferred. Thus, a thermal transfer ink ribbon for producing a dry transfer material used in producing a dry transfer material for retransfer to an arbitrary receptor, which is formed on the surface of a predetermined film-like ribbon base material and colored. Layer containing an agent, a binder containing wax as a main component, and a pressure-sensitive adhesive, and formed on the ink layer, containing polyamide and rosin ester, and containing organic or inorganic powder The adhesiveness is strong at the time of thermal transfer, and the adhesiveness becomes small at a temperature of 55 ° C. or lower.

(Specific Configuration / Operation) By the way, the heat-sensitive transfer ink ribbon according to the present invention as described above has, for example, as shown in FIG. 1, an ink on one surface of a film-shaped ribbon base material (support) 11. The layer 12 is formed, and the transferability adjusting layer 13 is further formed thereon with a predetermined thickness. A sticking prevention layer 14 made of a heat resistant resin such as a silicone resin is provided on the surface of the ribbon base material 11 opposite to the coated surface of the ink layer 12.

In such a thermal transfer ink ribbon 10 for producing a dry transfer material, as the film-shaped ribbon base material 11 that supports the ink layer 12, various materials conventionally used as a base material of the thermal transfer ink ribbon are used. Can be used, but since the thermal head of the printing device is brought into contact with the ink ribbon for thermal transfer, the heat-resistant temperature is 150 ° C or higher, polyester,
A resin film made of polyimide, polycarbonate, polysulfone, polyether sulfone, polyphenylene sulfide, or the like, or paper such as capacitor paper or glassine paper is used as a suitable material, and its thickness is also appropriately determined depending on the type of material. However, it is generally desirable to use a film having a thickness in the range of 3 to 20 μm.

The ink layer 12 is mainly composed of a colorant, a binder agent and a pressure sensitive adhesive. As the colorant, a pigment such as carbon black is mainly used, but an appropriate dye may be added as necessary for adjusting the color tone.

And, as the binder agent constituting the ink layer 12, plant waxes such as candelilla wax, carnauba wax, rice wax, and wax wax; animal waxes such as beeswax, lanolin, whale wax; montan wax, ceresin, etc. Mineral waxes; waxes composed of one or more petroleum waxes such as paraffin wax and microcrystalline wax, and tackifiers such as petroleum resin, rosin resin, ketone resin, polyamide resin, phenol resin Is used.
As the above waxes, a resin wax such as α-olefin-maleic anhydride copolymer can also be used, and the tackifier is ink adhesion, hardness improvement,
It functions to provide cohesive force, adhesive force, and pressure-sensitive adhesive. In addition, the wax and the tackifier which compose the binder agent are generally 15: 1 by weight.
It will be mixed in a ratio of about 3: 2.

Further, as the pressure-sensitive adhesive constituting the ink layer 12, polyvinyl chloride, polyacrylic acid ester, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, polyvinyl acetate, polyvinyl ether, polyvinyl acetal, Vinyl-based polymers such as polyisobutylene;
Fiber polymers such as ethyl cellulose, nitrocellulose, and cellulose acetate; rubber polymers such as chlorinated rubber and natural rubber, and the like are used alone or in combination of two or more.

The above colorant, binder agent, and pressure-sensitive adhesive constituting the ink layer 12 are generally mixed in a ratio of about 5 to 30:40 to 93: 2 to 30, and preferably at a temperature of 95 ° C. In the above, the ink composition gives a viscosity of less than 3000 centipoise, especially about 200 to 1000 centipoise. Further, such an ink composition is dissolved or dispersed in an appropriate solvent to be an ink liquid, or is heated and mixed to form an ink, which is formed on the desired film-shaped ribbon base material 11 by a known method. According to the above, the coating or hot melt coating is performed.

On the other hand, the transferability adjusting layer 13 as a top coat layer, which is formed on the ink layer 12, is composed of a uniform composition of polyamide and rosin ester, and further an organic or inorganic powder. It is advantageously configured as a layer having a higher viscosity (under thermal transfer conditions) than the ink layer 12 and having high heat-sensitive adhesiveness, hardness and cohesive force. Therefore, the transferability adjusting layer 13 is improved in heat transferability to a surface having poor wettability by increasing its adhesive force during heat transfer, and has increased cohesive force, viscosity and hardness. Therefore, the transfer failure such as crushing and spreading is effectively improved, and the ink has a function of preventing the ink from being scratched by the head of the printing apparatus. Further, when the pressure is applied from the back of the basic sheet of the dry transfer material to transfer the image of the ink (transfer image) produced by the thermal transfer to the transfer target, at the time of the pressure sensitive transfer, the transferability adjusting layer 13 has the cohesive force. Since the hardness is large and the adhesiveness is small, it is possible to transfer a predetermined ink image from the basic sheet as a unit without residual ink, and the transferred ink also spreads and is crushed. It makes it possible to obtain a beautiful image without any damage and at the same time protects the transferred image to make it strong.

By the way, the transferability adjusting layer 13 as described above has a large film forming property and uses polyamide as a resin having a large heat-sensitive adhesive property.
Although rosin esters are used as a resin having a large cohesive force and adhesiveness, polyamide having a large film forming property is used for hot melt adhesives or inks such as gravure. Although it has a melting point of about 90 to 130 ° C. and forms a film having a large heat-sensitive transfer property on the ink layer 12, it alone is sufficient for print skips and print defects during heat transfer. In the present invention, by adding a rosin ester, which is a tackifying resin, since good printing quality cannot be obtained,
By improving the adhesion between the polyamide and the ink layer 12, the cohesive force, the hardness, and the adhesiveness are increased, so that the print skips, print breaks, etc.
It was made possible to obtain a sufficiently good thermal transfer property. And, such rosin esters have a softening point of
A material having low tackiness at 80 ° C. or higher and 55 ° C. or lower is suitably selected, and in the environment of 5 ° C. to 35 ° C., the surface of the transferability adjusting layer is not tacky, has no tackiness, and ribbon running is performed well 55 ° C
Therefore, even under the storage condition, the good storage property without blocking to the back surface of the ribbon can be obtained. Here, the rosin ester is composed of functional groups -OH and -COOH of a rosin-based resin and an organic acid, an alcohol, a metal ion or the like bonded thereto, as compared with hydrogenated rosin which is simply hydrogenated. Moreover, since the melting point and softening point are high, such characteristics can be easily obtained. Incidentally, such a polyamide resin and rosin esters are blended in a proportion of 20 to 70% by weight of the former and 80 to 30% by weight of the latter,
The target transferability adjusting layer 13 is formed.

Then, a composition comprising a heat-sensitive adhesive polyamide having a large film-forming property and a rosin ester having tackifying property is a solution or dispersion of an appropriate general-purpose organic solvent that does not damage the ink layer 12. In the form of, in accordance with the usual coating method, it is applied to the ink layer 12 in a predetermined thickness, the transferability adjusting layer 13 formed in this manner, the ink under thermal transfer conditions. The layer 12 has a higher viscosity than that of the layer 12, and generally has a viscosity of 3000 centipoise or more, preferably 10,000 centipoise or more at a temperature of 95 ° C.

In addition, the transferability adjusting layer 13 thus formed,
In addition, in order to adjust the film strength to obtain a sharp and sharp printed image, and to prevent stains and blocking, fillers such as kaolin, talc, bentonite, and titanium oxide, zinc stearate, and stearic acid are used. An organic or inorganic powder such as metal soap such as aluminum is blended in a ratio not exceeding 20% by weight to form a transferability adjusting layer.
It will be made to exist in 13.

Then, using the ink ribbon 10 thus obtained, the head heating element shape, the head heating element position, the head mounting angle, the head pressing pressure, the winding torque, the head applied energy, the printing speed, etc. are adjusted. The desired dry transfer material can be advantageously produced by setting it in a printing device such as the above-mentioned thermal transfer type printer and performing printing and thermal transfer.

That is, by using such an ink ribbon 10, a film having a surface with poor wettability (basic sheet)
Even if you print the transfer image of the desired character or figure on top,
Spreading, crushing, shading, scraping by the head, stringing,
A good printed image can be realized without causing any problems such as citron skin or insufficient transfer. Further, when printing on paper, it is possible to obtain sufficiently good quality.

Even if the image printed in this way is pressure-sensitively transferred from the back side of the film (basic sheet) to the target transfer material such as paper, plastics, metal, etc., such film There is no residual ink on the top, and the transferred image can be formed as a good image that is firmly adhered without being crushed, spread, or brittle.

Furthermore, when running the ribbon, there are no problems such as ribbon meandering and slipping, and printing and heat transfer can be performed up to the end of the ribbon, and regarding storage stability, such an ink ribbon can be stored at 55 ° C. Even when it is kept for 24 hours, problems such as blocking and winding disorder do not occur at all.

(Examples) Hereinafter, several examples of the present invention will be shown to clarify the present invention more specifically, but the present invention is not limited by such description. It goes without saying that.

In addition to the following embodiments, the present invention further includes various changes and modifications based on the knowledge of those skilled in the art, in addition to the above specific description, without departing from the spirit of the present invention. It should be understood that improvements and the like can be added.

Example 1 In order to form the ink layer (12) and the transferability adjusting layer (13), an ink and a transferability adjusting layer forming coating liquid having the following compositions were prepared. The viscosity of the ink layer (12) formed by this ink is 270 centipoise (95
C.), and the viscosity of the transferability adjusting layer (13) formed by such a coating liquid was 40,000 to 60,000 centipoise (95.degree. C.). Ink layer (12) composition weight part α-olefin-maleic anhydride 2 copolymer [DIACARNA 30 manufactured by Mitsubishi Kasei Co., Ltd.] Candelilla wax 3 [Candelilla wax 2698 manufactured by Chukyo Yushi Co., Ltd.] Micro Crystalline Wax 9 [Hi-Mic1045 manufactured by Nippon Seiro Co., Ltd.] Rosin ester 2 [Superester A-100 manufactured by Arakawa Chemical Industry Co., Ltd.] Ethylene-vinyl acetate copolymer 2 [Manufactured by Mitsui DuPont Polychemical Co., Ltd.] EVA 210] Carbon black 2 [MA-7 manufactured by Mitsubishi Kasei Kogyo Co., Ltd.] Methyl isobutyl ketone (solvent) 100 Transferability adjusting layer (13) Composition by weight Polyamide 1 [Sanmide 615A manufactured by Sanwa Chemical Industry Co., Ltd. ] Rosin ester 1 [Super ester A-100 manufactured by Arakawa Chemical Industry Co., Ltd.] Isopropyl alcohol 38 and 3.5 μm polyester as the ribbon base material (11). Using a film of ethylene terephthalate (PET), an ink having the above composition is coated on the film to a dry film thickness of 6 to 7 μm, and dried to form an ink layer (1
After 2) is formed, a transferability adjusting layer forming coating solution having the above composition is further applied thereon so that the dry film thickness is 0.2 to 2 μm, and dried to obtain the target ink. I got a ribbon (10).

Then, using the ink ribbon thus obtained, it was set on a controlled thermal transfer typewriter (EP-43 manufactured by Brother Industries, Ltd.), and a polyethylene film coated with a silicone resin (thickness: When printed on 100 μm), a sufficiently beautiful and good quality printed image could be obtained. Further, when such a printed polyethylene film was rubbed from the back side and pressure was applied, the printed image was pressure-sensitively transferred onto a desired surface of paper, plastic or metal, and it was found to have sufficiently good quality. I was able to complete the statue.

Further, using such an ink ribbon, ribbon storability and running properties were tested under the following conditions. That is, 35
Those kept at ℃ 72 hours, those kept at 55 ℃ 24 hours,
Hold at 35 ℃ for 72 hours, then at 55 ℃ for 24 hours,
The storability was observed for the one kept at 55 ° C. for 24 hours and further kept at 35 ° C. for 72 hours, and then the ribbon running test was conducted by adding the one just after coating. As a result, good storage stability was obtained without blocking and winding disorder, and good ribbon running performance was also obtained without meandering or slipping.

Example 2 As the ink for forming the ink layer (12), the one having the same composition as in Example 1 was used, while as the transfer liquid for forming the transferability adjusting layer, the one having the following composition was used, An ink ribbon (10) was prepared in the same manner as in Example 1, and the same heat-sensitive transfer test, pressure-sensitive transfer test, ribbon running test and storage test were carried out. As a result, good results were obtained as in Example 1. The viscosity of the transferability adjusting layer (13) formed with the coating liquid having the composition as described below has a viscosity of 50,000 to 70,000 centipoise (95%).
℃). Transferability adjusting layer (13) Composition by weight Polyamide 91 [Sanmide 615A manufactured by Sanwa Chemical Industry Co., Ltd.] Rosin ester 91 [Super ester A-100 manufactured by Arakawa Chemical Industry Co., Ltd.] Titanium oxide 18 [Ishihara Sangyo ( As manufactured by A-100] Isopropyl alcohol (solvent) 3800 (Effect of the invention) As is apparent from the above description, according to the present invention, the ink layer is formed on the ribbon base material (support) of the ink ribbon together with the ink layer. As a top coat layer, a transferability adjusting layer having high heat-sensitive adhesiveness, hardness, viscosity, and cohesive force is provided, and polyamide and rosin ester are used in such a transferability adjusting layer, and further an organic or inorganic powder is contained to form a ribbon. We were able to achieve good runnability and preservability at room temperature (55 ° C or less), and because the adhesiveness at room temperature was small, we achieved thermal transfer. In addition to being able to advantageously improve the pressure-sensitive transferability of a printed image formed on a basic sheet surface such as a film to other substances by pressure, it is possible to advantageously produce a dry transfer material having excellent properties. Therefore, there is a great industrial significance of the present invention.

[Brief description of drawings]

FIG. 1 is a sectional explanatory view showing an example of a thermal transfer ink ribbon for producing a dry transfer material according to the present invention. 10: Thermal transfer ink ribbon 11: Ribbon substrate, 12: Ink layer 13: Transferability adjusting layer 14: Sticking prevention layer

Claims (1)

[Claims] 1. An arbitrary receptor by pressurizing an ink image thermally transferred onto a substrate sheet by a thermal transfer system from a surface opposite to a surface on which the ink image is thermally transferred on the substrate sheet. A thermal transfer ink ribbon for producing a dry transfer material, which is used when producing a dry transfer material for re-transferring onto a film, which is formed on the surface of a predetermined film-like ribbon base material and contains a coloring agent and a wax as main components. An ink layer containing a binder agent and a pressure-sensitive adhesive to be formed, formed on the ink layer, containing polyamide and rosin esters, and containing organic or inorganic powder,
A thermal transfer ink ribbon for producing a dry transfer material, which has a transferability adjusting layer which has a strong adhesive force during thermal transfer and which has a low adhesive force at a temperature of 55 ° C or lower.