IES980583A2 - A thermal printing ink - Google Patents
A thermal printing inkInfo
- Publication number
- IES980583A2 IES980583A2 IE980583A IES980583A IES980583A2 IE S980583 A2 IES980583 A2 IE S980583A2 IE 980583 A IE980583 A IE 980583A IE S980583 A IES980583 A IE S980583A IE S980583 A2 IES980583 A2 IE S980583A2
- Authority
- IE
- Ireland
- Prior art keywords
- printing ink
- range
- varnish
- thermal printing
- printing
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
Description
This invention relates to a printing ink, and in particular to a printing ink for use in thermal printing applications.
Thermal printing is widely used, for example, in 5 supermarkets for printing labels indicating the contents and price of goods being purchased. It is difficult to produce a problem-free printing ink for thermal printing.
One of the main difficulties arises in trying to achieve good heat resistance while at the same time having good water resistance. Relatively long drying times are common with a result that smudging and ill defined printing of the label can occur.
The present invention is directed towards overcoming this problem.
According to the invention, there is provided a printing ink for use in thermal printing applications comprising a mixture of a dispersion colour and a varnish, the varnish comprising in combination a very hard styrene-acrylic emulsion having a tg (glass transition temperature) in the range 90-100°C and an MFT (minimum film forming temperature) in the range 70-75JC, a solution acrylic resin having a tg in the range 90-1003C and a wax.
It has been found that the combination of these types of hard styrene acrylic emulsion and solution acrylic resin 25 produces a particularly desirable printing ink for thermal printing applications which combines good heat resistance with water resistance. Advantageously, the ink dries relatively quickly - typically within about 2 minutes of printing.
'NT Cl 4 GAO on Z rc PUBLIC INSPECTS
UNDER ' 23 AND RULE 23 — OF,.„
IE 980583
- 2 Preferably, the emulsion, resin and wax are combined in the ratio 20:74:6 by weight.
In another aspect of the invention, there is provided a process for producing a printing ink for use in thermal printing applications, the process comprising:preparing ia varnish by combining a very hard styreneacrylic emulsion having a tg in the range 90-100'C and an MFT in the range 70-75?C with a solution acrylic resin having a tg in the range 90-100°C and a wax, adding a dispersion colour and optionally conditioning additives to the varnish and mixing the dispersion colour and the varnish to produce an homogenous printing ink.
In a further embodiment, the styrene-acrylic emulsion, solution acrylic resin and the wax are combined in the ratio 20:74:6 by weight.
The invention will be more clearly understood by the following description of an example thereof.
Example
Dispersion colour
Antifoam
Varnish wt. %
1-50 balance
The varnish is prepared as follows:IE 980583 wt. %
Styrene acrylic emulsion Solution acrylic resin Wax
The above-mentioned varnish ingredients are mixed to produce a varnish which is subsequently mixed with the desired quantities of dispersion colour and antifoam to produce a printing ink of the invention.
The styrene acrylic emulsion has a tg in the range 90100°C and an MFT in the range 70-75°C. The solution acrylic resin has a tg in the range 90-100°C.
It has been found that the printing ink of the invention is particularly suited to thermal printing applications as it combines good water resistance with good heat resistance which facilitates thermal printing. This particular combination provides a particularly advantageous balance of soft and hard polymers to achieve this end result.
The invention is not limited to the embodiment hereinbefore described which may be varied in construction and detail.
Claims (5)
1. A printing ink for use in thermal printing applications comprising a mixture of a dispersion colour and a varnish, the varnish comprising in combination a very hard styrene-acrylic emulsion having a tg in the range 90-100 c C and an MFT in the range 7O-75°C, a solution acrylic resin having a tg in the range 90-100°C and a wax.
2. A printing ink for use in thermal printing applications substantially as hereinbefore described with reference to the example.
3. A process for producing a printing ink for use in thermal printing applications, the process comprising :preparing a varnish by combining a very hard styrene-acrylic emulsion having a tg in the range 90-100°C and an MFT in the range 70-75 c C with a solution acrylic resin having a tg in the range 90-100°C and a wax, and mixing the varnish with a dispersion colour to produce the printing ink.
4. A process for producing a printing ink substantially as hereinbefore described with reference to the example .
5. A printing ink for use in thermal printing applications whenever produced by the process as claimed in claim 3 or 4.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IE980583A IES980583A2 (en) | 1998-07-17 | 1998-07-17 | A thermal printing ink |
| GB9816253A GB2339788B (en) | 1998-07-17 | 1998-07-27 | A thermal printing ink |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IE980583A IES980583A2 (en) | 1998-07-17 | 1998-07-17 | A thermal printing ink |
| GB9816253A GB2339788B (en) | 1998-07-17 | 1998-07-27 | A thermal printing ink |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| IES80902B2 IES80902B2 (en) | 1999-06-16 |
| IES980583A2 true IES980583A2 (en) | 1999-06-16 |
Family
ID=26314117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IE980583A IES980583A2 (en) | 1998-07-17 | 1998-07-17 | A thermal printing ink |
Country Status (2)
| Country | Link |
|---|---|
| GB (1) | GB2339788B (en) |
| IE (1) | IES980583A2 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU627151A1 (en) * | 1977-04-01 | 1978-10-05 | Киевский Филиал По Специальным Видам Печати Всесоюзного Научно-Исследовательского Института Комплексных Проблем Полиграфии | Dye for deep printing on aluminium |
| US4173554A (en) * | 1978-07-10 | 1979-11-06 | Sun Chemical Corporation | Aqueous printing inks with improved transfer properties |
| US5434215A (en) * | 1994-06-14 | 1995-07-18 | Air Products And Chemicals, Inc. | Water-based polymeric emulsions incorporating wax |
| GB2324796A (en) * | 1997-04-25 | 1998-11-04 | Kores Nordic | Printing Composition |
-
1998
- 1998-07-17 IE IE980583A patent/IES980583A2/en not_active IP Right Cessation
- 1998-07-27 GB GB9816253A patent/GB2339788B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| GB9816253D0 (en) | 1998-09-23 |
| IES80902B2 (en) | 1999-06-16 |
| GB2339788A (en) | 2000-02-09 |
| GB2339788B (en) | 2002-04-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM4A | Patent lapsed |