EP0016320A2 - A ribbon for non-impact electrothermic printing - Google Patents
A ribbon for non-impact electrothermic printing Download PDFInfo
- Publication number
- EP0016320A2 EP0016320A2 EP80100496A EP80100496A EP0016320A2 EP 0016320 A2 EP0016320 A2 EP 0016320A2 EP 80100496 A EP80100496 A EP 80100496A EP 80100496 A EP80100496 A EP 80100496A EP 0016320 A2 EP0016320 A2 EP 0016320A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- ribbon
- transfer layer
- printing
- hydrogenated rosin
- glycerol ester
- 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.)
- Withdrawn
Links
Classifications
-
- 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
- B41M5/3825—Electric current carrying heat transfer sheets
Definitions
- the invention relates to a ribbon for non-impact, electrothermic printing.
- U .S. patents 2,713,822 and 3,744,611 are illustrative of the prior art of non-impact, electrothermic printing employing a ribbon containing a transfer coating and a substrate. Electrothermic printing ribbons are known in the art and are disclosed, for example, in U.S. patents 3,744,611 and 3,988,131.
- U.S. patent 3,988,131 discloses transfer layers formed from styrene resins and/or terpene resins and epoxy resins. It also mentions ketonic resins, ethers of colophony and non-drying alkyd resins. (It should be noted that colophony is another name for rosin.) Polyamides, phenol-formaldehyde resins, and ethylene-vinyl acetate copolymers have also been found useful in transfer layers.
- a ribbon for non-impact printing characterised in that the ribbon includes an electrically conductive substrate and a transfer layer comprising colouring material and glycerol ester of hydrogenated rosin.
- the resulting printing sticks to the paper so that it does not smear.
- the printing may be removed by lift-off or abrasion, i.e. rubbing, methods more readily than previously obtained printing. This totally unexpected advantage makes correction of the printed product much easier than was previously the case.
- a ribbon for thermoelectric transfer printing comprises an electrically conductive substrate.
- This conveniently may be a layer of polycarbonate which has been made electrically conductive by the inclusion of small particles of carbon.
- This polycarbonate-carbon may, when desired, be coated with a layer of aluminium which is from about 1,000 to about 1,500 A° units thick.
- the transfer layer is placed on top of this conductive substrate.
- the transfer layer comprises one or more coloured materials.
- the colouring materials most often employed are carbon black and various dyes, which may be used alone or in combination with each other. In general, it is desirable that the ratio by weight of coloured material to glycerol ester of hydrogenated rosin be from approximately 2% to approximately 50%, preferably about 10%.
- the transfer layer is most conveniently applied to the conductive substrate from solution, for example, by means of a meniscus coater. It has been found that the coating properties of glycerol ester of hydrogenated rosin are improved when there is added to the coating mixture some ethyl cellulose. Ethyl cellulose is usually added in an amount from about 5% to about 10% by weight of glycerol ester of hydrogenated rosin.
- a substrate was prepared of 70% by weight of polycarbonate resin and 30% conductive carbon dispersed therein. This layer was metallized with approximately 1200 A° units of aluminium.
- a solution was prepared of 20 grams of STAYBELITE ester 5, 1.8 grams carbon black and 0.1 grams of methyl violet in 80 grams of isopropyl alcohol.' (STAYBELITE ester 5, is the trademark of Hercules, Inc. for their brand of glycerol ester of partially hydrogenated wood rosin). It is a pale, medium-hard, thermoplastic resin with resistance to oxidation and discolouration.
- the resistive ribbon was used in writing in an electrothermic printing apparatus. At a current level-of 55-60 milliamps, excellent quality images were obtained; density and image sharpness were a very high order. Furthermore, even though the resulting printing was smear free, it was possible to remove it by lift-off and by abrasion methods.
- Another resistive ribbon film was prepared by coating an ink transfer layer of the following formulation on a metallized polycarbonate-carbon resistive layer:
- the mixture was applied on a metallized resistive layer by means of a meniscus coater so that the final dry thickness was approximately 2-4 microns thick.
- the resultant resistive ribbon was used to print high quality images with good release properties, i.e., the ribbon did not stick to the paper upon transfer of the ink.
- the ink must be easily released from the ribbon to the paper during the printing step or the ink will act as a "glue" between the paper and ribbon, preventing separation of the ribbon from the paper.
- the ink layer with Staybelite ester 5 as a thermoplastic resin is easily released from the metallized resistive layer. The images were of good resolution.
- a ribbon was made as in Example 2, except 0.86 grams ethyl cellulose was used instead of 1.15 grams.
- the print was formed at 480 x 480 PEL (Picture Elements). In both cases the images were non-smear with print densities of about 1.0 optical density when printed with a voltage of about 12 volts and a current of about 50 milliamps.
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
- Impression-Transfer Materials And Handling Thereof (AREA)
Abstract
A ribbon for non-impact electrothermic printing is provided. The ribbon includes an electrically conductive substrate and a transfer layer. The transfer layer comprises colouring material and glycerol ester of hydrogenated rosin. The transfer layer also included ethyl cellulose.
Description
- The invention relates to a ribbon for non-impact, electrothermic printing.
- U.S. patents 2,713,822 and 3,744,611 are illustrative of the prior art of non-impact, electrothermic printing employing a ribbon containing a transfer coating and a substrate. Electrothermic printing ribbons are known in the art and are disclosed, for example, in U.S. patents 3,744,611 and 3,988,131. U.S. patent 3,988,131 discloses transfer layers formed from styrene resins and/or terpene resins and epoxy resins. It also mentions ketonic resins, ethers of colophony and non-drying alkyd resins. (It should be noted that colophony is another name for rosin.) Polyamides, phenol-formaldehyde resins, and ethylene-vinyl acetate copolymers have also been found useful in transfer layers.
- According to the invention there is provided a ribbon for non-impact printing characterised in that the ribbon includes an electrically conductive substrate and a transfer layer comprising colouring material and glycerol ester of hydrogenated rosin.
- It has now been found that superior electrothermic printing can be obtained by using a ribbon comprising an electrically conductive substrate and a transfer layer which comprises colouring material and glycerol ester of hydrogenated rosin. The presence of glycerol ester of hydrogenated rosin makes the resulting printing capable of finer resolution than previously obtained, and also has the additional advantage of being more readily correctable. Furthermore, the glycerol ester of hydrogenated rosin has less tendancy to adhere to the electrically conductive substrate and, therefore, transfers easier than previously known transfer layers.
- When glycerol ester of hydrogenated rosin is used in the transfer layer, the resulting printing sticks to the paper so that it does not smear. The printing, however, may be removed by lift-off or abrasion, i.e. rubbing, methods more readily than previously obtained printing. This totally unexpected advantage makes correction of the printed product much easier than was previously the case.
- As is well known in the art, a ribbon for thermoelectric transfer printing comprises an electrically conductive substrate. This conveniently may be a layer of polycarbonate which has been made electrically conductive by the inclusion of small particles of carbon. This polycarbonate-carbon may, when desired, be coated with a layer of aluminium which is from about 1,000 to about 1,500 A° units thick. The transfer layer is placed on top of this conductive substrate. The transfer layer comprises one or more coloured materials. The colouring materials most often employed are carbon black and various dyes, which may be used alone or in combination with each other. In general, it is desirable that the ratio by weight of coloured material to glycerol ester of hydrogenated rosin be from approximately 2% to approximately 50%, preferably about 10%.
- The transfer layer is most conveniently applied to the conductive substrate from solution, for example, by means of a meniscus coater. It has been found that the coating properties of glycerol ester of hydrogenated rosin are improved when there is added to the coating mixture some ethyl cellulose. Ethyl cellulose is usually added in an amount from about 5% to about 10% by weight of glycerol ester of hydrogenated rosin.
- A substrate was prepared of 70% by weight of polycarbonate resin and 30% conductive carbon dispersed therein. This layer was metallized with approximately 1200 A° units of aluminium. A solution was prepared of 20 grams of STAYBELITE ester 5, 1.8 grams carbon black and 0.1 grams of methyl violet in 80 grams of isopropyl alcohol.' (STAYBELITE ester 5, is the trademark of Hercules, Inc. for their brand of glycerol ester of partially hydrogenated wood rosin). It is a pale, medium-hard, thermoplastic resin with resistance to oxidation and discolouration. It has a low odour and a low acid number.) The above solution, with the carbon in suspension, was applied to the aluminized layer by means of a meniscus coater. The ink layer, after drying, was determined to be 12 microns thick. The resistive ribbon was used in writing in an electrothermic printing apparatus. At a current level-of 55-60 milliamps, excellent quality images were obtained; density and image sharpness were a very high order. Furthermore, even though the resulting printing was smear free, it was possible to remove it by lift-off and by abrasion methods.
- Another resistive ribbon film was prepared by coating an ink transfer layer of the following formulation on a metallized polycarbonate-carbon resistive layer:
- 1.60 grams Regal 330 carbon (Cabot Corp)
- 1.15 grams ethyl cellulose (20Cps)
- 0.09 grams methyl violet
- 40.0 grams isopropyl alcohol.
- The above was placed in an 8 oz. bottle with 200 grams of steel balls and was mixed on a paint shaker for 45 minutes.
- The mixture was allowed to cool and 17.25 grams of Staybelite ester 5 with 40 grams of isopropyl alcohol was added. The mixture was again placed on a paint shaker for an additional 45 minutes.
- After cooling, the mixture was applied on a metallized resistive layer by means of a meniscus coater so that the final dry thickness was approximately 2-4 microns thick.
- The resultant resistive ribbon was used to print high quality images with good release properties, i.e., the ribbon did not stick to the paper upon transfer of the ink.
- . The ink must be easily released from the ribbon to the paper during the printing step or the ink will act as a "glue" between the paper and ribbon, preventing separation of the ribbon from the paper. The ink layer with Staybelite ester 5 as a thermoplastic resin is easily released from the metallized resistive layer. The images were of good resolution.
- In another example, a ribbon was made as in Example 2, except 0.86 grams ethyl cellulose was used instead of 1.15 grams. The print was formed at 480 x 480 PEL (Picture Elements). In both cases the images were non-smear with print densities of about 1.0 optical density when printed with a voltage of about 12 volts and a current of about 50 milliamps.
Claims (5)
- '1. A ribbon for non-impact printing characterised in that the ribbon includes an electrically conductive substrate and a transfer layer comprising colouring material and glycerol ester of hydrogenated rosin.
- 2. A ribbon as claimed in Claim 1, in which the transfer layer also comprises ethyl cellulose.
- 3. A ribbon as claimed in Claim 2, in which the glycerol ester of hydrogenated rosin and the ethyl cellulose are present in a weight ratio of from about 5% to about 10%.
- 4. A ribbon as claimed in any one of Claims 1 to 3, in which the transfer layer is about 3 mils thick.
- 5. A ribbon as claimed in any one of the preceding Claims, in which the colouring material to glycerol ester of hydrogenated rosin ester weight ratio is from about 2% to about 50%.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US2056779A | 1979-03-15 | 1979-03-15 | |
US20567 | 1979-03-15 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0016320A2 true EP0016320A2 (en) | 1980-10-01 |
EP0016320A3 EP0016320A3 (en) | 1981-07-01 |
Family
ID=21799333
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP80100496A Withdrawn EP0016320A3 (en) | 1979-03-15 | 1980-02-01 | A ribbon for non-impact electrothermic printing |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0016320A3 (en) |
JP (1) | JPS55124693A (en) |
CA (1) | CA1135056A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0059308A2 (en) * | 1981-03-02 | 1982-09-08 | International Business Machines Corporation | A resistive ribbon for electrothermal printing and a method of producing the resistive ribbon |
US4384797A (en) * | 1981-08-13 | 1983-05-24 | International Business Machines Corporation | Single laminated element for thermal printing and lift-off correction, control therefor, and process |
EP0098357A1 (en) * | 1982-06-15 | 1984-01-18 | International Business Machines Corporation | Modified resistive layer in thermal transfer medium |
EP0176552A1 (en) * | 1984-03-05 | 1986-04-09 | Leedall Products Incorporated | Pressure sensitive transfer elements and method of making |
GB2179168A (en) * | 1985-07-12 | 1987-02-25 | Canon Kk | Heat-sensitive transfer recording |
US4692044A (en) * | 1985-04-30 | 1987-09-08 | International Business Machines Corporation | Interface resistance and knee voltage enhancement in resistive ribbon printing |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61229593A (en) * | 1985-04-05 | 1986-10-13 | Dainippon Printing Co Ltd | Thermal transfer sheet |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2360917A1 (en) * | 1976-08-04 | 1978-03-03 | Ozalid Group Holdings Ltd | Master for electrostatic duplication process - has image areas of higher resistivity than background areas on operative side of master |
-
1980
- 1980-01-14 CA CA000343628A patent/CA1135056A/en not_active Expired
- 1980-02-01 EP EP80100496A patent/EP0016320A3/en not_active Withdrawn
- 1980-02-20 JP JP1930380A patent/JPS55124693A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2360917A1 (en) * | 1976-08-04 | 1978-03-03 | Ozalid Group Holdings Ltd | Master for electrostatic duplication process - has image areas of higher resistivity than background areas on operative side of master |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0059308A2 (en) * | 1981-03-02 | 1982-09-08 | International Business Machines Corporation | A resistive ribbon for electrothermal printing and a method of producing the resistive ribbon |
EP0059308A3 (en) * | 1981-03-02 | 1983-02-09 | International Business Machines Corporation | A resistive ribbon for electrothermal printing and a method of producing the resistive ribbon |
US4384797A (en) * | 1981-08-13 | 1983-05-24 | International Business Machines Corporation | Single laminated element for thermal printing and lift-off correction, control therefor, and process |
EP0098357A1 (en) * | 1982-06-15 | 1984-01-18 | International Business Machines Corporation | Modified resistive layer in thermal transfer medium |
US4477198A (en) * | 1982-06-15 | 1984-10-16 | International Business Machines Corporation | Modified resistive layer in thermal transfer medium having lubricating contact graphite coating |
EP0176552A1 (en) * | 1984-03-05 | 1986-04-09 | Leedall Products Incorporated | Pressure sensitive transfer elements and method of making |
EP0176552A4 (en) * | 1984-03-05 | 1987-01-22 | Leedall Products Inc | Pressure sensitive transfer elements and method of making. |
US4692044A (en) * | 1985-04-30 | 1987-09-08 | International Business Machines Corporation | Interface resistance and knee voltage enhancement in resistive ribbon printing |
GB2179168A (en) * | 1985-07-12 | 1987-02-25 | Canon Kk | Heat-sensitive transfer recording |
GB2179168B (en) * | 1985-07-12 | 1989-11-29 | Canon Kk | Heat-sensitive transfer recording method |
Also Published As
Publication number | Publication date |
---|---|
CA1135056A (en) | 1982-11-09 |
EP0016320A3 (en) | 1981-07-01 |
JPS55124693A (en) | 1980-09-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): DE FR GB IT |
|
17P | Request for examination filed |
Effective date: 19801218 |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
R17P | Request for examination filed (corrected) |
Effective date: 19801216 |
|
AK | Designated contracting states |
Designated state(s): DE FR GB IT |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19820413 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: SHATTUCK, MEREDITH DAVID |