JPH09290560A - Ink jet image receiving sheet for transfer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water jet ink image receiving sheet which is of one of a variety of printable materials and water-proof and is not limited only to paper or film acceptable into a printer. SOLUTION: A composition consisting of an organic or an inorganic filler dispersed in a binder is formed on a separable base material as a transfer layer so that a water-soluble thermoplastic resin can be used as the binder to improve the absorptive and adsorptive properties of a water jet ink. In addition, an image can be transferred to various materials by heating a water jet ink image receiving sheet from its separable base material film side using an iron. Further, it is possible to obtain a water-proof transfer layer by dispersing a water-insoluble (lipophilic) thermoplastic resin particle into the composition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image receiving sheet for an ink jet printer that prints with a water-based ink. More specifically, it relates to a transfer sheet that can transfer a sheet printed with a water-based ink to various adherends by heat. That is, the present invention relates to a transfer ink jet image-receiving sheet in which an ink jet image-receiving (physical) layer using a water-based ink directly serves as a transfer layer.

[0002]

2. Description of the Related Art There have been many applications for ink-jet image-receiving sheets, and mainly water-soluble resins are used as binders. In addition, in order to improve transparency and ink fixing property, a special shape of the inorganic pigments, those surface-treated with them, and those obtained by finely pulverizing them are mentioned. The main purpose of these is to increase the receptivity of water-based ink by using a water-soluble resin, and to increase the ink fixing property, ink adsorbing property, anti-bleeding property, etc. by using an inorganic filler. is there.

Therefore, for these purposes, it is required that the water-soluble resin contain as much inorganic pigment as possible and that it is pulverized as much as possible in order to improve transparency.
It is also known that the thinner the layer, the higher the transparency. Thus, a transparent sheet for OHP and an image receiving sheet for high image quality are manufactured and commercially available.

[0004]

However, it is a matter of course that a printer can print on these image-receiving sheets because the thickness of the image-receiving sheet is small enough to enter the printer. Limited to those that can bend along the roll surface of. Therefore, the image obtained by the ink jet printer can be applied to other materials such as glass, wood board, plastic board, non-woven fabric,
It was impossible to print on fabrics, metal plates, foils, etc. However, there is a strong demand for easy printing on these at home, office, etc. The present invention has been made to solve these problems.

[0005]

Therefore, in order to solve these problems, the present inventors chose a water-soluble and thermoplastic resin, and made the ink-receiving layer thicker than the normal thickness to improve heat resistance. In order to improve the fluidity and the transferability when adding, and to improve the ink drying property, an inorganic or organic filler was contained.

The ink jet receiving layer, which is usually used for OHP film and the like, has a layer thickness which does not deteriorate the transparency.
It is at most 15 μm to 25 μm, and also has ink fixability,
A large amount of inorganic filler is used in comparison with the binder in order to obtain the sharpness of the image. Therefore, even if these ink jet receiving layers are provided on the releasable substrate, the transferability by heat hardly occurs.

Most of the components of the ink-jet receiving layer are
This is because 0 to 95% is the finely pulverized inorganic filler, and even if the water-soluble resin is a thermoplastic resin, the fluidity due to heat is hardly generated. The minimum amount of water-soluble resin added for forming a film as a binder for the inorganic filler is
This is because it is also a means of producing the sharpness of the image. Further, in order to improve water resistance, it is preferable that the amount of water-soluble resin is as small as possible.

Further, a small amount of a cross-linking agent may be used in these water-soluble resins in order to improve water resistance, but in this case, the thermoplasticity is naturally lost. Therefore, as described above, by simply providing the conventional ink jet image-receiving layer on the releasable substrate, it is not possible to obtain a transfer sheet for ink jet having the ink acceptability of the present inventors and transferability. .

The inventors of the present invention have used water-soluble resins or hydrophilic resins as synthetic resins such as polyvinylpyrrolidone, sodium polyacrylate, polyester, polyacrylamide, polyvinyl alcohol, polyethylene glycol, polypropylene glycol, starch, gelatin, If natural resin or its derivative such as casein, gum arabic, sodium alginate, carboxymethyl cellulose, methyl cellulose, ethyl cellulose or the like is selected, the one having good thermoplasticity and good ink acceptability and the material to be transferred are selected. We found that the adhesiveness is good.

In practice, the transferability is often improved by using a combination of a high molecular weight substance and a low molecular weight substance, rather than using a single substance. However, the combination of only water-soluble or hydrophilic resins may result in poor ink drying properties, so it has been found that it is better to include an inorganic filler or an organic filler to the extent that transferability is not impaired.

As the inorganic filler, for example, light calcium carbonate, heavy calcium carbonate, kaolin (white clay), talc, calcium sulfate, barium sulfate, titanium oxide,
Zinc oxide, zinc sulfide, zinc carbonate, satin white, aluminum silicate, diatomaceous earth, calcium silicate,
Pigments such as magnesium silicate, synthetic amorphous silica, aluminum hydroxide, alumina and lithopone.

As the organic filler, styrene black pigment, acrylic plastic pigment, microcapsule urea resin pigment, ion exchange resin powder, cellulose powder, wool powder, urethane resin fine powder, nylon resin fine powder, chitin chitosan fine powder. , Collagen and various starch fine powders, epoxy resin fine powders, polyethylene resin fine powders, polypropylene resin fine powders, ethylene vinyl acetate resin fine powders, paraffin fine powders, resin fine powders obtained by crosslinking a water-soluble resin to make it insoluble However, the present invention is not limited to the above.

[0013] Specifically, the filler should be limited to about 70% with respect to 100 parts by weight of the thermoplastic water-soluble resin, depending on the type, especially in the case of silica fine powder having a large specific surface area. It is desirable to set the content to about 50%. If more than this is included, as described above, the fluidity becomes poor when heat is applied, and the transferability deteriorates.

The releasable substrate may be any as long as it can withstand the heat applied during transfer, but polyethylene terephthalate (PET) is usually convenient.
A film or a film obtained by subjecting a di- or tri-cellulose acetate film to a peeling treatment, and in some cases, can be used without being treated. Also, a laminate obtained by laminating a thermoplastic resin film on a paper substrate and subjecting it to a peeling treatment can be sufficiently used for this purpose.

[0015] On these releasable substrate, the composition of the present invention when dried by applying about ^{50g / m 2 ~200g / m 2} , can be obtained transfer sheet. Thickness range is 25
It is desirable that the thickness is from 100 μm to 100 μm, preferably 35 μm
It is not less than m and not more than 80 μm. If it is smaller than this film thickness, the adhesiveness to a porous or absorbent transfer material including cloth is deteriorated, and if it is 100 μm or more, the cost of the material is increased and the coating speed at the time of production becomes slow, which is economical. Not be. However, this does not apply to systems such as T-die and calender that do not use a solvent such as water.

Another feature of the present invention is that a water-insoluble thermoplastic resin can be dispersed in the composition. A water-soluble resin in which only an inorganic or organic filler is dispersed is naturally inferior in water resistance and moisture resistance, but if a crosslinking agent or the like is added in order to improve this, heat It could not be used because it loses plasticity.

Therefore, the present inventors investigated various substances,
As a result of study, by adding a lipophilic thermoplastic resin to a composition comprising a water-soluble thermoplastic resin and a filler, ink jet acceptability (absorption, stickiness), transferability (thermoplasticity and adhesiveness) It was found that a transfer sheet having water resistance can be obtained without impairing the above.

That is, even if a water-insoluble (lipophilic) thermoplastic resin is added to the composition of the thermoplastic water-soluble resin which is the binder and the filler having the hydrophilic surface which is the ink adsorbent. Of course, there is no uniform compatibility, and the thermoplastic resin is in a dispersed state in the form of particles as in the case of the present invention. When the jet ink adheres to the ink receiving layer in such a state, the ink is absorbed and fixed by the water-soluble resin and the filler. Since the lipophilic thermoplastic resin is not compatible with each other and does not form a film on the surface of the ink jet receiving layer,
The hydrophilicity of the surface is not impaired.

The thus obtained transfer sheet provided with information by ink jet is heated from the film surface of the releasable base material layer and brought into contact with the transfer target body, and the transfer layer is melted, It is adhered to the transferred material. At this time, the thermoplastic water-soluble resin that is the binder, the filler, and the lipophilic thermoplastic resin are forcibly heated and made to flow, so that the filler to which the ink is fixed and the lipophilic thermoplastic resin also come into contact. It was found that the transfer material transferred to the transferred material, for example, even after being transferred to a cloth or the like and then washed, has much higher wash resistance than the one to which the lipophilic thermoplastic resin is not added. .

Although this was initially unexpected, it seems that the filler to which the water-based ink is fixed (adsorbed) is adhered to the material to be transferred by the lipophilic thermoplastic particles. When it is washed with water and dried after being transferred to a cloth or the like, it seems that only the water-soluble resin is washed away by the water washing, and the texture of the cloth is remarkably better than that of the transferred material.

The amount of the lipophilic thermoplastic resin to be added is desirably 20 parts by weight or more and 200 parts by weight or less, preferably 30 parts by weight, relative to 100 parts by weight (water-soluble thermoplastic resin + filler).
It is from 100 parts by weight to 100 parts by weight. Although the preferable range of these amounts varies depending on the kind of the filler used, if the amount of the lipophilic thermoplastic to be added is too large, the ink acceptability is deteriorated this time, which is not preferable. Therefore, it is important to balance the amount of filler used, hydrophilicity, and lipophilic thermoplastic resin.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to Examples.

[0023]

【Example】

(Example 1) Silica (Nipsil E150, average particle diameter 5 μm; made by Nippon Silica) 50 parts by weight Talc 5 parts by weight Thermoplastic water-soluble resin (Paogen PP-15; manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) 100 parts by weight Ion Exchanged water 150 parts by weight The above composition was uniformly mixed and dispersed to obtain a uniform composition. The above composition was coated on a PET (polyethylene terephthalate) film having a thickness of 50 μm so as to have a dry thickness of 35 μm and dried to obtain an ink jet image-receiving transfer sheet.
This was cut to size A-4 and printed with a commercial ink jet printer (cyan, Touch the printed screen to a 240 μm thick paperboard and iron (1
70 ~ 180 ° C) from the back side of PET substrate at about 15 ~ 2
When pressed and heated for 0 seconds, the pattern was transferred to the cardboard. Similarly, when the transfer was performed on the cotton cloth, the penetration into the cloth was small, and the transfer was performed, but the pattern became thin due to washing. Therefore, in the case of an absorbent substrate such as cloth, a thicker transfer layer is required and water resistance is also required to be increased.

(Example 2) Silica (Nipsil E150) 50 parts by weight Modified polyvinyl alcohol (Paogen PP-15) (thermoplastic water-soluble resin) 100 parts by weight Thermoplastic water-insoluble resin particles (Miperon, 25 to 30 μm; Mitsui) Petrochemical) 30 parts by weight Ion-exchanged water 180 parts by weight In the same manner as in (Example 1), a thickness of 80 μm exfoliated.
Was coated on the triacetate film of to give a dry film thickness of 50 μm to obtain an ink jet image-receiving transfer sheet.
A-4 size was cut and the ink acceptability was almost unchanged as in Example 1. However, when transferred to a cotton cloth or the like, the thickness of the transfer layer increased. Penetration improved. Also, when this was washed, the pattern fell much less in the first and second washings than in the examples.

Example 3 Diatomaceous earth 100 parts by weight Polyethylene glycol (PEO-1; manufactured by Sumitomo Seika) 100 parts by weight Ethylene vinyl acetate resin emulsion (solid content 50%; manufactured by Zeon Corporation) 200 parts by weight Ion-exchanged water 250 In the same manner as in parts by weight (Example 1), a transfer layer having a thickness of 70 μm was obtained on the PET film. When an image was formed with a printer and then transferred to the surface of wood, the transferability was good and the water resistance was also good. It did not bleed when water was dropped.

(Example 4) Microcrystalline cellulose (manufactured by Asahi Kasei) -Filler 50 parts by weight Poval (PVA-505; manufactured by Kuraray) 100 parts by weight Micropro (fine powder polypropylene; 200 parts by weight; manufactured by Micropowders) Ion 300 parts by weight of exchanged water (Example 3) and dried film thickness (transfer layer) 50 μm
I got a transfer sheet of m. When it was transferred to an acrylic resin nonwoven fabric, it showed good penetration, good adhesiveness, and good water resistance as compared with Example 1.

(Example 5) Zeolite 50 parts by weight Paogen (modified PVA); Daiichi Kogyo Seiyaku Co., Ltd. 100 parts by weight Fine powder low molecular weight polyethylene (High Wax HP10A; Mitsui Petrochemical Co., Ltd.) 100 parts by weight Mix in a vat, T-die to a thickness of 7
A 0 μm film was formed. A heat-resistant silicone-treated release paper was used as the take-up base material (peelable support). When an image was drawn on this with an ink jet printer and transferred to an FRP plate with an iron, the ink acceptability and transferability were good.

[0028]

As described above, since the ink jet can be image-received by the sheet, can be transferred to various materials, and has water resistance, the use and application range of the water-based ink and the color printer are expanded at once.

Claims (2)

[Claims] 1. An image-receiving sheet for ink jet, comprising a releasable support provided with a transfer layer containing filler particles and a binder which is water-soluble and has a thermoplastic resin as a main component. 2. An image-receiving sheet for ink jet, comprising a releasable support provided with a transfer layer containing filler particles, a water-soluble thermoplastic resin, and a water-insoluble thermoplastic resin.