EP0260347A2 - Wiederverwendbare Farbstoff enthaltende Schicht für Thermoübertragungsdruck - Google Patents

Wiederverwendbare Farbstoff enthaltende Schicht für Thermoübertragungsdruck Download PDF

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Publication number
EP0260347A2
EP0260347A2 EP86117680A EP86117680A EP0260347A2 EP 0260347 A2 EP0260347 A2 EP 0260347A2 EP 86117680 A EP86117680 A EP 86117680A EP 86117680 A EP86117680 A EP 86117680A EP 0260347 A2 EP0260347 A2 EP 0260347A2
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EP
European Patent Office
Prior art keywords
ink sheet
printing
compound
fatty acid
ink
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP86117680A
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English (en)
French (fr)
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EP0260347B1 (de
EP0260347A3 (en
Inventor
Hiroo Fujitsu Limited Ueda
Hiroshi Fujitsu Limited Sasao
Kohei Fujitsu Limited Kiyota
Koji Fujitsu Limited Uchiyama
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Fujitsu Ltd
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Fujitsu Ltd
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Filing date
Publication date
Priority claimed from JP60286354A external-priority patent/JPS62142690A/ja
Priority claimed from JP60286355A external-priority patent/JPS62144996A/ja
Priority claimed from JP61217327A external-priority patent/JPS6372593A/ja
Application filed by Fujitsu Ltd filed Critical Fujitsu Ltd
Publication of EP0260347A2 publication Critical patent/EP0260347A2/de
Publication of EP0260347A3 publication Critical patent/EP0260347A3/en
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Publication of EP0260347B1 publication Critical patent/EP0260347B1/de
Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/382—Contact thermal transfer or sublimation processes
    • B41M5/392—Additives, other than colour forming substances, dyes or pigments, e.g. sensitisers, transfer promoting agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers

Definitions

  • the present invention relates to thermal recording (heat transfer recording), and more particularly to an improved thermal ink sheet or ribbon which is repeatedly usable for the thermal recording. It further relates to an improved composition of thermal ink material.
  • an ink sheet having a solid ink composition layer coated on a substrate such as a polyester film is used.
  • a thermal printing head contacts the substrate with some pressure, and transfers heat to the solid ink composition layer. The heat is distributed selectively on the contact surface of the printing head corresponding to an image pattern to be reproduced.
  • the heated solid ink material contained in the layer melts and adheres to the surface of a receiving sheet, i.e. a printing paper, which is closely in contact with the ink sheet. Consequently, the image pattern is transferred onto the printing paper.
  • the thermal recording process is used in various recording means for information apparatus, such as facsimiles, word processors, personal computers, automatic ticket issuing machines, etc.
  • the thermal recording process has substantial advantages, such as low noise printing, compact size, low cost, and low running cost by the use of plain paper as the receiving sheet.
  • a printed image is transferred onto a receiving sheet like a decalcomania.
  • a smooth plain paper having Bekk smoothness higher than 200 seconds is required in order to obtain clear printing quality.
  • the thermal solid ink material hereinafter, simply 'ink material'
  • the thermal solid ink material must contain more resinous components to strengthen the adhesion of the printed image to the plain paper, or have improved film forming ability and bridging property.
  • the melting point of the thermal ink material rises, causing the printing ink sheet to have lower printing sensitivity. Consequently, the printing energy must be increased, requiring a heavy load and shortening the life of the associated thermal printing head.
  • thermal recording process is the vast consumption of ink sheets, because in a single thermal recording step, all the ink material existing on the areas of the substrate of the ink sheet corresponding to the record pattern is transferred, making it impossible to use the ink sheet again in a succeeding thermal recording step.
  • An ink sheet of this type is referred to as a 'one-­time' ink sheet, and is used up each time the printing image is transferred to the printing paper. This increases the running cost of the thermal recording process.
  • a thermal ink composition layer is disposed on a substrate, for example a polyester film.
  • the ink composition layer includes a porous transfer layer, and ink material is contained in the pores of the porous transfer layer.
  • the reusable thermal printing ink sheet of the prior art must be three to five times thicker than one-­time thermal printing ink sheet in order to withstand the repeated thermal printing operation, causing low printing sensitivity and requiring more printing energy. Particularly when a plain paper having a rough surface is used, a more resinous ink material is needed, having a higher melting point and a higher melted viscosity as described above. In a cold environment, therefore, such prior art reusable thermal printing ink sheets cannot be used for a conventional thermal printing apparatus.
  • the prior art multi-time thermal printing ink sheet has other problems, namely, background noise of the printed paper and ghost images which are transferred to the printing paper.
  • the background noise is caused by the character of the surface of the associated ink sheet, a powdery and adhesive surface of the ink sheet having an adverse effect.
  • a printing paper is contaminated only by the friction between the surfaces of the ink sheet and printing paper during their storage or printing operation. Accordingly, the background noise is found in both the one time ink sheet and the multi-time use ink sheet of the prior art.
  • FIG. 1 shows schematic, enlarged cross-sectional and plan views of an ink sheet and images transferred onto a printing paper, illustrating the states of the surface of the printing paper (upper row), the ink composition layer (middle row) and the cross-section of the ink composition layer (lower row), at the periods respectively before printing, after printing, and during succeeding printing stages where no printing signal but only printing pressure is applied (blank printing).
  • a substrate 1 is coated with an ink composition layer 3 which has a porous layer therein formed of coagulated carbon powder 4.
  • Ink material 5 stored in the pores of the porous structure contains low temperature melting compounds (waxes) and coloring agents soluble therein. After an image is transferred onto the paper, the originally smooth surface of the ink layer 3 is roughened when the ink sheet is peeled off the printing paper 10. A lot of micro peaks 6 are left which are formed by half-melted viscous ink material pulled in a direction normal to the surface of the ink sheet. These peaks 6 are distributed in the form of a reverse image 8. If the ink material 5 is brittle in its solid state, namely, at room temperature, these peaks 6 are easily collapsed and tend to be transferred to the printing paper 10 when only a printing pressure of the printing head (represented by a pressing roller 11) is applied to the ink sheet in the next printing step.
  • a printing pressure of the printing head represented by a pressing roller 11
  • the faint image 4 is referred to as a ghost image. If a new pattern is printed in the succeeding step, the new pattern image and the ghost image 4 are transferred on the same portion of the printing paper 10. Thus, the printing quality is lowered.
  • the background noise and the ghost images are frequently found in thermal recording using a prior art ink sheet comprising low temperature melting compounds such as fatty acid compounds, fatty acid amide compounds, or ester compounds, because these materials are brittle or have powdery surfaces in their solid state.
  • the ink sheet When the ink sheet is peeled off the printing paper just after the completion of the transfer of the printing image, the ink material still in a half-melted state is pulled leaving sharp, elongated peaks of the solid ink material. Such elongated peaks collapse very easily, even though the urethane compound is not so brittle, causing a ghost image on the printing paper.
  • the resulting transferred image has a rather low optical density, caused by a non-uniform printed image which has many white spots where no ink material is transferred locally.
  • the observed optical density of a printed image is regarded as an average optical density. Consequently, a non-uniform printed image has low optical density.
  • the non-uniform printed image is also believed to be due to the high viscosity of the ink material of this type.
  • the melting point is also rather high, requiring large printing energy and the use of relatively smooth plain paper as the receiving sheet.
  • an ink sheet containing only the urethane compound is not suitable as a reusable multi-­time ink sheet. There is thus a need for a further improved thermal recording ink sheet for practical use.
  • Embodiments of the present invention can provide an improved reusable thermal recording ink sheet which gives little or no ghost image on the printing paper during the thermal recording process.
  • Embodiments of the present invention can also provide an improved reusable thermal recording ink sheet which is capable of transferring a reproduced printing image onto a plain paper having a relatively rough surface.
  • They can also provide an improved reusable thermal recording ink sheet which allows thermal recording even in a cold environment.
  • the present invention comprises a thermal recording ink sheet wherein a layer of an ink composition is formed over a substrate, which may be of polyester or the like.
  • the ink composition comprises a filler, e.g. fine carbon powder, and ink material which is solid at room temperature but melts on heating to a fairly low temperature.
  • the ink material is sometimes referred to as solid ink material.
  • the ink material contains a low temperature melting compound and coloring agent which are soluble in one other.
  • the low temperature melting compound comprises urethane compound as base material and at least one additive material selected from ester compounds, fatty acid amide compounds, and fatty acid compounds. These compounds are generally wax-like materials.
  • the additive materials may also include paraffin wax to reduce the viscosity of the ink material.
  • the particles of the filler e.g. fine carbon powder referred to as carbon black, tend to coagulate to form a porous layer and accommodate the ink material in the pores of the porous layer as described above.
  • the ink sheet is heated and the solid ink material is melted, the fluid ink material is expressed from the pores under pressure provided by the relevant printing head and transferred onto a printing paper.
  • the porous layer acts as a transfer control layer.
  • the ink material may also contain plasticizer.
  • the additive materials such as ester compounds, fatty acid compounds, and fatty acid amide compounds, act as viscosity modulators of the associated ink material in the molten state, lowering the viscosity of the urethane compound.
  • the viscosity of the new ink material at the printing temperature is fairly low, providing the melted ink material with flowability sufficient to make the ink material flow and reach the surface of the printing paper even if the surface of the paper is rather rough and uneven.
  • the flowing ink material penetrates into the paper to some degree or forms a film adhered to the surface of the paper.
  • the new ink sheet can provide a clear and uniform thermal printing image with a satisfactory optical density and accompanied by no ghost images. Furthermore, rough plain papers become available as printing paper. It has been confirmed that a new printing ink sheet according to the present invention can provide better images of satisfactory printing quality even after more than ten thermal printing processes.
  • Fig. 2 is a schematic cross-sectional view of an example of a reusable ink sheet according to the present invention.
  • the ink sheet comprises a substrate 21 which is coated by an intermediate layer 22.
  • a solid ink composition layer 23 is further formed over the intermediate layer 22, which serves to maintain good adhesion between the substrate 21 and the solid ink composition layer 23.
  • any material may be used that can withstand the heat of the thermal printing head, i.e. any conventional material which does not soften, melt, or deform upon heating of the head.
  • the materials conventionally used include polyester film, polyimide film, polycarbonate film, and other polymeric films, condenser papers, and other thin papers.
  • the intermediate layer 22 prevents the solid ink composition layer 23 from coming off the surface of the substrate 21 when the ink sheet is heated.
  • the substrate 21 may be a polyester film 6 ⁇ m in thickness, coated by a 3 ⁇ m thick intermediate layer and formed of polyester resin and polyamide resin, and the solid ink layer may be 10 ⁇ m in dry thickness.
  • the urethane compound was a reaction product of hexamethylene diisocyanate and ethanol supplied by Nippon Yuchi Ltd. as "Alflow BH-­20", and having the chemical formula C2H5O-CO-NH-C6H12-NH-CO-OC2H5, the coloring agent was Kayaset Black (product of Nippon Kayaku Ltd.) and the filler was carbon black (product of Tokai Carbon Ltd. in the first example and of Nippon Kayaku Ltd. in the other examples).
  • the solid ink composition was prepared by thoroughly blending the following components using acetone as solvent; Coloring agent: ...1 part by weight Filler: ...0.5 parts by weight Low temperature melting compounds: urethane compound: ...2 parts by weight ester compound (carnauba wax): ...0.1 to 1 part by weight paraffin wax: ...1 part by weight.
  • the reusable ink sheet of this example of the first embodiment was cut into a ribbon ink sheet and tested with a conventional serial thermal printing machine employing a printing paper, such as a Xerographic paper of PA4 type, a product of Kusu Seishi Ltd., having a rather rougher surface (Bekk smoothness of 60 seconds) than ordinary high quality thermal printing paper (Bekk smoothness of 250 seconds).
  • the printing energy employed was 30 mJ/mm2, and the printing pulse width was 1 ms.
  • the results of a repeated printing test are shown in Fig. 3, wherein the optical density O.D. of the printed images is plotted as the ordinate and the number of the repetition as the abscissa.
  • the printing image pattern is a solid area which is repeatedly printed on the Xerographic paper using the same portion of the solid ink sheet under testing.
  • the O.D. value starts from approximately 1.0 and decreases to around 0.6 after printing five times. This implies that the ink material including urethane compound mixed with ester compound has an improved film formation ability on a printing paper, resulting in a high optical density of the printed images and the elimination of the ghost image.
  • Fig. 4 illustrates the relationship between the ratio of ester compound to urethane compound by weight and the optical density of the printed image transferred to a printing paper using the relevant ink material.
  • the maximum optical density of the printed image is obtained at the ratio of 0.2 by weight and uniform, clear printing images are achieved.
  • ester compound namely with the ink material containing only urethane compound as the low temperature melting compound, the optical density is low. With ratios higher than 0.5 or lower than 0.1, ghost image formation occurs.
  • a low temperature melting compound having a ratio of ester compound to urethane compound by weight ranging from 0.1 to 0.5 is therefore preferable.
  • the decrease in the optical density O.D. at weight ratios over 0.3 is due to low mutual solubility between the coloring agents and the ester compounds.
  • a fatty acid amide compound is used as an additive material to the low temperature melting compound instead of the ester compound of the first embodiment.
  • the blending composition of the material of the ink composition layer 23 in an example of this second embodiment is as follows, using acetone as solvent: Coloring agent: ...1 part by weight Filler: ...0.8 parts by weight Low temperature melting compounds: urethane compound: ...2 parts by weight fatty acid amide compound*: ...0.1 to 1 part by weight paraffin wax**: ...1 part by weight *(product of Nippon Yushi Ltd.) **(product of Nippon Seiro Ltd.).
  • the repeated printing test of a solid ink sheet of the second embodiment was conducted in just the same manner as with the first embodiment.
  • the pattern of the printing image was also a solid area.
  • Fig. 5 shows the relationship between the weight ratio of fatty acid amide compound to urethane compound and the optical density of a printed image transferred onto a printing paper using the relevant ink material.
  • the maximum optical density of the printed image is obtained at the ratio of 0.2 by weight, and uniform, clear printing images are achieved.
  • fatty acid amide compound namely with an ink material containing only urethane compound as the low temperature melting compound, the optical density is low.
  • the ratio by weight range from 0.1 to 0.5 is therefore preferable.
  • a fatty acid compound is used as additive material to the low temperature melting compound, instead of the ester compound of the first embodiment.
  • the composition of the material of an ink composition layer 23 in an example is as follows, acetone being used as solvent.
  • Coloring agent ...1 part by weight
  • Filler (carbon black) ...0.5 parts by weight
  • Low temperature melting compounds urethane compound: ...2 parts by weight fatty acid compound: ...0.1 to 1 part by weight paraffin wax*: ...1 part by weight *(product of Nippon Seiro Ltd.).
  • a repeated printing test of the solid ink sheet of the third embodiment is performed in just the same manner as with the first embodiment.
  • the pattern of the printing image is also a solid area.
  • the result, illustrated in Fig. 7, is very similar to that of the first embodiment shown in Fig. 3.
  • the fall in the optical density of the printed image is rather sharper, down to 0.5 with five printing times.
  • a remarkable feature of the third embodiment is the low viscosity of the ink material in the melted state (cf. Table 1) and its low melting temperature. This implies an essential effectiveness of the further application of the fatty acid compounds to the solid ink material.
  • solid ink sheets of the preceding embodiments a single additive material is added to the urethane compound of the low temperature melting compound.
  • solid ink material containing combinations of two additive materials will be disclosed.
  • a combination of fatty acid amide compound and ester compound is used as combined additive material.
  • the composition of the material of the ink composition layer 23 in an example is as follows. Acetone was used as solvent. Coloring agent: ...1 part by weight Filler: ...0.5 parts by weight Low temperature melting compounds: urethane compound: ...2 parts by weight fatty acid amide compound (Diamid -200*) (main component olenic acid amide): ...0.5 parts by weight ester compound (Carnauba Wax**): ...0.5 parts by weight paraffin wax**: ...0.5 parts by weight *(product of Nippon Kasei Ltd.) **(product of Nikko Fine Products Ltd.). **(product of Nikko Fine Products Ltd.).
  • the repeated printing test of the solid ink sheet of the fourth embodiment was conducted in just the same manner as the first embodiment.
  • the patterns of the printing image were solid area and ordinary Japanese characters printed at random. The results are illustrated in Fig. 8. With a solid area pattern, the resulting optical density of the printed image decreases from 1.0 at the first printing to 0.5 at the fifth printing. However, with ordinary Japanese character images, the optical density of the relevant image only decreased slightly and can be maintained at approximately 0.9 on average, which is satisfactory in practice even after ten repeated printings. The ghost image is completely eliminated, achieving high quality printing with uniform optical density of characters printed on the paper and being free from 'white spot' (partially non-transferred portion of printed images).
  • fatty acid amide compounds instead of Diamid -200 the following components are applicable with good printing image: erucic acid amide, commercially available under trade name Alflow P-10 (product of Nippon Yushi Ltd.), N-stearyl oleic acid amide, trade name Nikkaamaido SO (product of Nippon Kasei Ltd.), ricinoleic acid amide, trade name Diamid H (product of Nippon Kasei Ltd.).
  • ester compounds instead of carnauba wax, the following components can be used with good results: beeswax, stearyl behenate (product of Nippon Yushi Ltd.), cane sugar fatty acid amide, trade name Sugar Wax FA-10E (product of Dai Ichi Industry Ltd.).
  • Fig. 9 illustrates the relationship between the weight ratio of fatty acid amide compound to urethane compound or of fatty acid amide compound to urethane compound plus ester compound and the optical density of a printed image transferred to a printing paper using the relevant ink material.
  • the weight ratio of ester compound to urethane compound is maintained at 0.2.
  • the optical density of the printed image is over 1.0 for the range from zero to 0.6 of the ratio of fatty acid amide compound to the urethane compound higher than 0.5 (upper scale of the Figure), implying that excess addition of fatty acid compound makes the solidified ink material brittle. Weight ratios not higher than 0.5 are therefore preferable.
  • the viscosity of the ink material in its molten state for example at 75°C, is fairly low resulting in a uniform printing image.
  • the structure of a solid ink sheet of the fifth embodiment is the same as that of the first embodiment with the addition of fatty acid compounds such as myristic acid, palmitic acid, stearic acid and behenic acid as additive agents to the low temperature melting compound.
  • the additive agent thus comprises ester compounds and fatty acid compound.
  • the structure of a solid ink sheet of the sixth embodiment is the same as that of the second embodiment, with the addition of fatty acids such as myristic acid, palmitic acid, stearic acid and behenic acid. That is, the additive agent to the low temperature melting compound of the solid ink material comprises fatty acid compounds and fatty acid amide compounds.
  • composition of the solid ink material of the sixth embodiment is as follows, using acetone as solvent: Coloring agent: ...1 parts by weight Filler: ...0.5 parts by weight Low temperature melting compounds: urethane compound*: ...2 parts by weight fatty acid amide compound (Diamid -200)**: ...0.5 parts by weight fatty acid compound (C14 to C22)*: ...0.5 parts by weight Paraffin Wax 145F*** ...0.5 parts by weight *(product of Nippon Yushi Ltd.) **(product of Nippon Kasei Ltd.) *(product of Nippon Yushi Ltd.). ***(product of Nikko Fine Products Ltd.).
  • C n designates an alkyl group having n atoms of carbon
  • C14 corresponds to myristic acid
  • C16 corresponds to palmitic acid
  • C16+C18 corresponds to stearic acid
  • C22 corresponds to behenic acid.
  • These fatty acid compounds may be added to the solid ink material singly or with two or more fatty acid compounds in combination.
  • the same evaluating tests as that of the first embodiment are performed with a solid ink sheet of the sixth embodiment with satisfactory results.
  • An optical density above 1.0 is achieved, and uniform printing image is attained on a Xerographic paper with a rough surface. In addition, no ghost image is found in the printed papers tested.
  • the viscosity of the ink material at 75°C is also fairly low as the result of the addition of fatty acid compounds (cf. Table 1).
  • the fatty acid compounds containing an alkyl group having a number of carbon atoms ranging from twelve to twenty-­four are preferred.
  • Fig. 10 illustrates the relationship between the ratio of fatty acid compound (stearic acid) to urethane compound by weight (upper scale) or the ratio of fatty acid compound to urethane compound plus fatty acid amide compound by weight (lower scale), and the optical density of a printed image transferred on a printing paper using the relevant ink material of the sixth embodiment.
  • the weight ratio of fatty acid amide compound to urethane compound is maintained at 0.25.
  • the optical density of the printed image is maintained over 1.0 for the range from zero to 0.5 of the ratio of fatty acid compound to urethane compound by weight. No ghost image is found for the ratio range 0 to 0.5 when the weight ratio of fatty acid amide compound to urethane compound is 0.25.
  • Fig. 11 is a viscosity characteristics diagram of solid ink materials, illustrating the relationship between temperature and viscosity.
  • Curve A illustrates the characteristic of an ink material without addition of fatty acid compound, and curve 8 with the addition of a fatty acid compound (stearic acid). From the curves, the effect of the fatty acid compound for reducing the viscosity of the ink material is clearly seen, particularly at lower temperature.
  • composition of the solid ink material of the seventh embodiment is illustrated as follows: Coloring agent: ...1 part by weight Filler: ...0.5 parts by weight Low temperature melting compounds: urethane compound: ...2 parts by weight fatty acid amide compound (Diamid -200*); ...0.5 parts by weight paraffin wax***: ...1 part by weight Plasticizer*: ...0.3 parts by weight *(product of Nippon Seiro Ltd.) **(product of Daihachi Kagaku Ltd.).
  • Plasticizers that may be used include, for example, phthalic acid esters such as dioctyl phthalate and diisodecyl phthalate, fatty acid esters such as dioctyl azelate and dibutyl sebacate, maleic acid and fumaric acid ester such as dibutyl maleate and dioctyl fumarate, and orthophosphoric acid esters such as tributyl phosphate and trioctyl phosphate.
  • phthalic acid esters such as dioctyl phthalate and diisodecyl phthalate
  • fatty acid esters such as dioctyl azelate and dibutyl sebacate
  • maleic acid and fumaric acid ester such as dibutyl maleate and dioctyl fumarate
  • orthophosphoric acid esters such as tributyl phosphate and trioctyl phosphate.
  • the same evaluating tests as that of the first embodiment were performed with a solid ink sheet of the seventh embodiment under environmental temperature ranging from 5°C to 40°C with satisfactory results.
  • An optical density above 1.0 was achieved, and a uniform printing image was attained on Xerographic paper with a rough surface.
  • the presence of plasticizer in the thermal ink sheet of the seventh embodiment can overcome the problem that at a low temperature, the portion of the ink composition layer 23 which is heated for the thermal printing is apt to come off from the substrate 21 locally when the ink sheet is peeled off the associated printing paper after the printing operation. Further, a clear thermal image is achieved with no ghost image and no background noise at high temperature.
  • Fig. 12 is a characteristics diagram of a solid ink material of an example of the seventh embodiment, illustrating the relationship between temperature and the optical density of a printed image.
  • Curve A illustrates the characteristic of the ink material with addition of plasticizer, here tributyl phosphate, and curve B without the addition of fatty acid compound. From the curves, the effect of the plasticizer in improving the optical density of the printed image at lower temperatures can be clearly seen. In fact, the addition of the plasticizer below the weight ratio of 3% is no more effective for a cold environmental temperature.
  • Fig. 13 is a characteristics diagram of the solid ink material above described, illustrating the relationship between the content of the plasticizer and the optical density of the printed image.
  • the thermal printing is performed at a room temperature of 22°C.
  • the ink material containing the plasticizer having a ratio of the plasticizer to the total solid ink material lower than 3% by weight still has some effect, because the thermal printing is performed at fairly high temperature.
  • the additive ratio of the tributyl phosphate increases, the optical density tends to decrease, but the uniformity of the printed images is somewhat improved.
  • ink material having the ratio of the plasticizer higher than 15% there can be some storage problems at high temperature. Consequently, ink material containing a plasticizer in a ratio of plasticizer to ink material from 3% to 15% is preferable.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
EP86117680A 1985-12-18 1986-12-18 Wiederverwendbare Farbstoff enthaltende Schicht für Thermoübertragungsdruck Expired - Lifetime EP0260347B1 (de)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP60286354A JPS62142690A (ja) 1985-12-18 1985-12-18 熱転写インクシ−ト
JP60286355A JPS62144996A (ja) 1985-12-18 1985-12-18 熱転写インクシ−ト
JP217327/86 1986-09-17
JP61217327A JPS6372593A (ja) 1986-09-17 1986-09-17 熱転写インクシ−ト
JP286354/85 1986-12-18
JP286355/85 1986-12-18

Publications (3)

Publication Number Publication Date
EP0260347A2 true EP0260347A2 (de) 1988-03-23
EP0260347A3 EP0260347A3 (en) 1989-09-27
EP0260347B1 EP0260347B1 (de) 1992-06-17

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EP86117680A Expired - Lifetime EP0260347B1 (de) 1985-12-18 1986-12-18 Wiederverwendbare Farbstoff enthaltende Schicht für Thermoübertragungsdruck

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EP (1) EP0260347B1 (de)
KR (1) KR920001485B1 (de)
DE (1) DE3685754T2 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3738934A1 (de) * 1987-11-17 1989-05-24 Pelikan Ag Thermofarbband
EP0319331A2 (de) * 1987-12-02 1989-06-07 Matsushita Electric Industrial Co., Ltd. Thermische Farbstoffübertragungsdruckschicht
EP0348695A2 (de) * 1988-06-06 1990-01-03 Oki Electric Industry Company, Limited Farbband
EP0390044A2 (de) * 1989-03-28 1990-10-03 Dai Nippon Insatsu Kabushiki Kaisha Wärmeempfindliche Übertragungsschicht

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3507097A1 (de) * 1984-03-02 1985-09-05 Canon K.K., Tokio/Tokyo Waermeempfindliches uebertragungsmaterial
US4585688A (en) * 1982-10-04 1986-04-29 Konishiroku Photo Industry Co., Ltd. Thermographic transfer recording medium
JPS62142690A (ja) * 1985-12-18 1987-06-26 Fujitsu Ltd 熱転写インクシ−ト
JPS62144996A (ja) * 1985-12-18 1987-06-29 Fujitsu Ltd 熱転写インクシ−ト

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4585688A (en) * 1982-10-04 1986-04-29 Konishiroku Photo Industry Co., Ltd. Thermographic transfer recording medium
DE3507097A1 (de) * 1984-03-02 1985-09-05 Canon K.K., Tokio/Tokyo Waermeempfindliches uebertragungsmaterial
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3738934A1 (de) * 1987-11-17 1989-05-24 Pelikan Ag Thermofarbband
US4995741A (en) * 1987-11-17 1991-02-26 Pelikan Aktiengesellschaft Thermal print-transfer ribbon
EP0319331A2 (de) * 1987-12-02 1989-06-07 Matsushita Electric Industrial Co., Ltd. Thermische Farbstoffübertragungsdruckschicht
EP0319331A3 (en) * 1987-12-02 1990-08-16 Matsushita Electric Industrial Co., Ltd. A dye-transfer-type thermal printing sheet
EP0348695A2 (de) * 1988-06-06 1990-01-03 Oki Electric Industry Company, Limited Farbband
EP0348695B1 (de) * 1988-06-06 1995-10-04 Oki Electric Industry Company, Limited Farbband
EP0390044A2 (de) * 1989-03-28 1990-10-03 Dai Nippon Insatsu Kabushiki Kaisha Wärmeempfindliche Übertragungsschicht
EP0390044A3 (de) * 1989-03-28 1991-04-03 Dai Nippon Insatsu Kabushiki Kaisha Wärmeempfindliche Übertragungsschicht
EP0535721A1 (de) * 1989-03-28 1993-04-07 Dai Nippon Insatsu Kabushiki Kaisha Wärmeempfindliche Übertragungsschicht
US5294589A (en) * 1989-03-28 1994-03-15 Dai Nippon Insatsu Kabushiki Kaisha Heat transfer sheet

Also Published As

Publication number Publication date
KR920001485B1 (ko) 1992-02-15
DE3685754T2 (de) 1993-02-04
EP0260347B1 (de) 1992-06-17
DE3685754D1 (de) 1992-07-23
EP0260347A3 (en) 1989-09-27
KR880003753A (ko) 1988-05-30

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