EP0293596B1 - Correction fluid and process for the treatment of scratches on lithographic printing plates - Google Patents
Correction fluid and process for the treatment of scratches on lithographic printing plates Download PDFInfo
- Publication number
- EP0293596B1 EP0293596B1 EP88106639A EP88106639A EP0293596B1 EP 0293596 B1 EP0293596 B1 EP 0293596B1 EP 88106639 A EP88106639 A EP 88106639A EP 88106639 A EP88106639 A EP 88106639A EP 0293596 B1 EP0293596 B1 EP 0293596B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- scratches
- composition according
- component
- printing plates
- treated
- 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.)
- Expired - Lifetime
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/02—Anionic compounds
- C11D1/34—Derivatives of acids of phosphorus
- C11D1/345—Phosphates or phosphites
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- B41N3/00—Preparing for use and conserving printing surfaces
- B41N3/08—Damping; Neutralising or similar differentiation treatments for lithographic printing formes; Gumming or finishing solutions, fountain solutions, correction or deletion fluids, or on-press development
Definitions
- the invention relates to a mixture and a method for the surface correction of a planographic printing plate with a metal carrier, preferably made of aluminum, which is scratched during handling.
- the fact that water and fats naturally repel each other is used in the planographic printing system.
- the surface of a planographic printing plate consists of areas that accept water and repel bold ink and those that repel water and accept bold ink.
- the former areas form the non-image areas, the others the image areas. Therefore, if the surface properties are disturbed in these two areas, e.g. For example, if the hydrophilic non-image areas are scratched when working with the plate, the inks tend to settle in those scratched areas which have reduced hydrophilicity, which leads to toning of the background.
- the scratches in the non-image areas fill with printing ink and gradually become oleophilic, so that "smearing" occurs.
- a method for hydrophilizing a metal surface, in particular an aluminum surface is that the surface with an aqueous alkali silicate solution, e.g. B. a solution of sodium or potassium metasilicate, is treated.
- an aqueous alkali silicate solution e.g. B. a solution of sodium or potassium metasilicate
- smeared areas are cleaned and scratches and weak defects such as. B. superficial scratches, removed from illustrated and developed printing plates.
- alkali silicates other alkaline salts of a strong base and a weak acid are also used in solutions such as e.g. B. is described in US-A 3,394,653.
- US Pat. No. 4,028,281 describes a treatment solution for metal plates, which is composed of an alkali silicate, a surfactant and the iron chelate of ethylenediaminetetraacetic acid and is used as a solution for cleaning and removing scratches on imaged and developed planographic printing plates. With these solutions, the scratches are often only corrected after a longer exposure time or there are still slight background veils when printing.
- the object of the present invention was therefore to develop a fast-acting correction fluid with a very good correction effect.
- the above object is achieved by a mixture consisting of 0.25 to 10.0% trisodium, trilithium or tripotassium phosphate, 0.25 to 5.0% sodium metasilicate, 0.10 to 5.0% of an arylphenol ethoxylate as anionic Surfactant and 80.0 to 99.4% water.
- the invention furthermore relates to a method for correcting scratches in the non-image areas of a planographic printing plate with a metal support, in which the scratch or scratches occur in an imagewise exposed and developed planographic printing plate with hydrophilic non-image areas and oleophilic image areas that have at least one scratch in a non-image area Mixture is applied, which consists of 0.25 to 10.0% trisodium, trilithium or tripotassium phosphate, 0.25 to 5.0% sodium metasilicate, 0.10 to 5.0% of an arylphenol ethoxylate as an anionic surfactant and 80.0 to There is 99.4% water.
- the phosphate component is contained in the mixture in a proportion of preferably 0.5 to 5.0% and in particular 1.0 to 3.0%. In a particularly preferred embodiment, trisodium phosphate is used.
- the sodium metasilicate content is preferably 0.5 to 3.0% and in particular 1.0 to 2.5%.
- the anionic surfactant is an arylphenol alkoxylate and, in the preferred embodiment, a potassium salt of phosphated, alkoxylated arylphenol. This component reduces the surface tension and facilitates easier penetration of the other components into the surface to be corrected.
- the surfactant content is preferably 0.2 to 3.0% and in particular 0.3 to 2.0%.
- the water content is preferably 89.0 to 98.8% and in particular 92.5 to 97.7%. The percentages are based on the weight of the mixture.
- Negative-working planographic printing plates (type N-250, manufacturer: Enco Printing Products Division of Hoechst Celanese Corporation) are used for the evaluation of the solution produced in this way.
- the N-250 plate is exposed, developed and used in a sheet-fed press (Heidelberg SORK brand), delivering prints of acceptable quality.
- the machine is stopped and the plate is scratched at four locations across the non-image areas. This is intended to simulate conditions that often occur when handling printing plates in the machine rooms. When printing on, it becomes apparent that the plate takes on ink at the scratched areas and also reproduces it on the printed sheet.
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Printing Plates And Materials Therefor (AREA)
Description
Die Erfindung betrifft ein Gemisch und ein Verfahren für die Oberflächenkorrektur einer bei der Handhabung verkratzten Flachdruckplatte mit Metallträger, vorzugsweise aus Aluminium.The invention relates to a mixture and a method for the surface correction of a planographic printing plate with a metal carrier, preferably made of aluminum, which is scratched during handling.
Im Flachdrucksystem nutzt man die Tatsache, daß sich Wasser und Fette von Natur aus gegenseitig abstoßen. Die Oberfläche einer Flachdruckplatte besteht aus Bereichen, die Wasser annehmen und fette Druckfarbe abstoßen und solchen, die Wasser abstoßen und fette Druckfarbe annehmen. Die erstgenannten Bereiche bilden die Nichtbildstellen, die anderen die Bildstellen. Wenn daher die Oberflächeneigenschaften in diesen beiden Bereichen gestört sind, z. B. wenn die hydrophilen Nichtbildstellen beim Arbeiten mit der Platte verkratzt werden, neigen die Druckfarben dazu, sich in solchen verkratzten Bereichen, die verminderte Hydrophilie aufweisen, abzusetzen, was zum Tonen des Hintergrundes führt. Die Kratzer füllen sich in den Nichtbildstellen also mit Druckfarbe und werden allmählich oleophil, so daß es zum "Schmieren" kommt.The fact that water and fats naturally repel each other is used in the planographic printing system. The surface of a planographic printing plate consists of areas that accept water and repel bold ink and those that repel water and accept bold ink. The former areas form the non-image areas, the others the image areas. Therefore, if the surface properties are disturbed in these two areas, e.g. For example, if the hydrophilic non-image areas are scratched when working with the plate, the inks tend to settle in those scratched areas which have reduced hydrophilicity, which leads to toning of the background. The scratches in the non-image areas fill with printing ink and gradually become oleophilic, so that "smearing" occurs.
Ein Verfahren zur Hydrophilierung einer Metalloberfläche, insbesondere einer Aluminiumoberfläche, besteht darin, daß die Oberfläche mit einer wäßrigen Alkalisilikatlösung, z. B. einer Lösung von Natrium- oder Kaliummetasilikat, behandelt wird. Mit solchen Lösungen werden auch verschmierte Stellen gereinigt und Kratzer und schwache Fehlstellen, wie z. B. oberflächliche Kratzer, von bebilderten und entwickelten Druckplatten entfernt. Zusätzlich zu Alkalisilikaten werden auch andere alkalische Salze einer starken Base und einer schwachen Säure in solchen Lösungen verwendet, wie es z. B. in der US-A 3 394 653 beschrieben ist.A method for hydrophilizing a metal surface, in particular an aluminum surface, is that the surface with an aqueous alkali silicate solution, e.g. B. a solution of sodium or potassium metasilicate, is treated. With such solutions, smeared areas are cleaned and scratches and weak defects such as. B. superficial scratches, removed from illustrated and developed printing plates. In addition to alkali silicates, other alkaline salts of a strong base and a weak acid are also used in solutions such as e.g. B. is described in US-A 3,394,653.
Die US-A 4 028 281 beschreibt eine Behandlungslösung für Metallplatten, die sich aus einem Alkalisilikat, einem Tensid und dem Eisenchelat der Ethylendiamintetraessigsäure zusammensetzt und als Lösung zum Reinigen und Entfernen von Kratzern auf bebilderten und entwickelten Flachdruckplatten eingesetzt wird. Mit diesen Lösungen werden die Kratzer oft erst nach längerer Einwirkzeit korrigiert bzw. ergeben sich beim Drucken immer noch geringe Hintergrundschleier.US Pat. No. 4,028,281 describes a treatment solution for metal plates, which is composed of an alkali silicate, a surfactant and the iron chelate of ethylenediaminetetraacetic acid and is used as a solution for cleaning and removing scratches on imaged and developed planographic printing plates. With these solutions, the scratches are often only corrected after a longer exposure time or there are still slight background veils when printing.
Aufgabe der vorliegenden Erfindung war es deshalb, eine schnell wirkende Korrekturflüssigkeit mit sehr guter Korrekturwirkung zu entwickeln.The object of the present invention was therefore to develop a fast-acting correction fluid with a very good correction effect.
Gelöst wird die vorstehend genannte Aufgabe durch ein Gemisch, bestehend aus 0,25 bis 10,0 % Trinatrium-, Trilithium- oder Trikaliumphosphat, 0,25 bis 5,0 % Natriummetasilikat, 0,10 bis 5,0 % eines Arylphenolethoxylats als anionischem Tensid und 80,0 bis 99,4 % Wasser.The above object is achieved by a mixture consisting of 0.25 to 10.0% trisodium, trilithium or tripotassium phosphate, 0.25 to 5.0% sodium metasilicate, 0.10 to 5.0% of an arylphenol ethoxylate as anionic Surfactant and 80.0 to 99.4% water.
Gegenstand der Erfindung ist ferner ein Verfahren zur Korrektur von Kratzern in den Nichtbildstellen einer Flachdruckplatte mit Metallträger, bei dem in einer bildmäßig belichteten und entwickelten Flachdruckplatte mit hydrophilen Nichtbildstellen und oleophilen Bildstellen, die mindestens einen Kratzer in einer Nichtbildstelle aufweist, auf den oder die Kratzer ein Gemisch aufgebracht wird, das aus 0,25 bis 10,0 % Trinatrium-, Trilithium- oder Trikaliumphosphat, 0,25 bis 5,0 % Natriummetasilikat, 0,10 bis 5,0 % eines Arylphenolethoxylats als anionischem Tensid und 80,0 bis 99,4 % Wasser besteht.The invention furthermore relates to a method for correcting scratches in the non-image areas of a planographic printing plate with a metal support, in which the scratch or scratches occur in an imagewise exposed and developed planographic printing plate with hydrophilic non-image areas and oleophilic image areas that have at least one scratch in a non-image area Mixture is applied, which consists of 0.25 to 10.0% trisodium, trilithium or tripotassium phosphate, 0.25 to 5.0% sodium metasilicate, 0.10 to 5.0% of an arylphenol ethoxylate as an anionic surfactant and 80.0 to There is 99.4% water.
Die Phosphatkomponente ist in einem Anteil von vorzugsweise 0,5 bis 5,0 % und insbesondere 1,0 bis 3,0 % in dem Gemisch enthalten. In ganz besonders bevorzugter Ausführung wird Trinatriumphosphat verwendet. Der Gehalt an Natriummetasilikat beträgt vorzugsweise 0,5 bis 3,0 % und insbesondere 1,0 bis 2,5 %. Das anionische Tensid ist ein Arylphenolalkoxylat und in der bevorzugten Ausführungsform ein Kaliumsalz von phosphatiertem, alkoxyliertem Arylphenol. Diese Komponente setzt die Oberflächenspannung herab und erleichtert ein leichteres Eindringen der anderen Komponenten in die zu korrigierende Oberfläche. Der Tensidgehalt beträgt vorzugsweise 0,2 bis 3,0 % und insbesondere 0,3 bis 2,0 %. Der Wassergehalt beträgt vorzugsweise 89,0 bis 98,8 % und insbesondere 92,5 bis 97,7 %. Die Prozentangaben sind jeweils auf das Gewicht des Gemisches bezogen.The phosphate component is contained in the mixture in a proportion of preferably 0.5 to 5.0% and in particular 1.0 to 3.0%. In a particularly preferred embodiment, trisodium phosphate is used. The sodium metasilicate content is preferably 0.5 to 3.0% and in particular 1.0 to 2.5%. The anionic surfactant is an arylphenol alkoxylate and, in the preferred embodiment, a potassium salt of phosphated, alkoxylated arylphenol. This component reduces the surface tension and facilitates easier penetration of the other components into the surface to be corrected. The surfactant content is preferably 0.2 to 3.0% and in particular 0.3 to 2.0%. The water content is preferably 89.0 to 98.8% and in particular 92.5 to 97.7%. The percentages are based on the weight of the mixture.
Die Erfindung soll durch die folgenden Beispiele näher erläutert, jedoch nicht darauf beschränkt sein.The invention is illustrated by the following examples, but is not limited thereto.
22,5 g Natriummetasilikat x 5H₂O, 30,0 g Trinatriumphosphat und 10,0 g einer Mischung aus anionischem Arylphenolalkoxylat und Lösemitteln ((R)Synfac 8337, Hersteller: Milliken Chemicals) werden in 1937,5 g entmineralisiertem Wasser gelöst. Das Gemisch wird 10 Minuten gerührt und ergibt eine klare, homogene Lösung.22.5 g of sodium metasilicate x 5H₂O, 30.0 g of trisodium phosphate and 10.0 g of a mixture of anionic arylphenol alkoxylate and solvents ( (R) Synfac 8337, manufacturer: Milliken Chemicals) are dissolved in 1937.5 g of demineralized water. The mixture is stirred for 10 minutes and results in a clear, homogeneous solution.
Für die Bewertung der so hergestellten Lösung werden negativ arbeitende Flachdruckplatten (Typ N-250, Hersteller: Enco Printing Products Division of Hoechst Celanese Corporation) verwendet. Die Platte N-250 wird belichtet, entwickelt und in einer Bogendruckmaschine (Marke Heidelberg SORK) eingesetzt, wobei sie Drucke in annehmbarer Qualität liefert. Die Maschine wird angehalten und die Platte an vier Stellen quer über die Nichtbildstellen mit Kratzern versehen. Damit sollen Bedingungen simuliert werden, wie sie bei der Handhabung von Druckplatten in den Maschinenräumen häufig vorkommen. Beim Weiterdrucken zeigt sich, daß die Platte an den verkratzten Stellen Druckfarbe annimmt und auch auf dem Druckbogen wiedergibt. Nach erneutem Anhalten der Maschine wird wie folgt verfahren: Eine verkratzte Stelle bleibt unbehandelt, der zweite Kratzer wird mit der in diesem Beispiel hergestellten Lösung behandelt, der dritte wird mit einer Waschlösung für Offsettücher, bestehend aus einer Mischung aus Kohlenwasserstoffen ((R)Varn-120) gereinigt und anschließend mit der Lösung aus diesem Beispiel behandelt, und der vierte wird zunächst mit einer Schutz-, Konservierungs- und Reinigungslösung ((R)FPC, einer Emulsion aus einer wäßrigen Phase mit einer hydrophilen, hochmolekularen Verbindung und einer Ölphase mit organischen Lösemitteln, Hersteller: Enco Printing Products Division of Hoechst Celanese Corporation) und danach mit der Lösung aus diesem Beispiel behandelt. Dann wird weitergedruckt. Bei dem unbehandelten Bereich druckt die Kratzstelle weiter. Die drei behandelten Bereiche drucken ohne Anzeichen einer verkratzten Oberfläche. Nach 5000 Drucken zeigt der mit der Lösung aus diesem Beispiel behandelte Bereich eine sehr geringe Farbannahme. Die beiden anderen behandelten Bereiche drucken bis zum Ende der Auflage von 230.000 Drucken einwandfrei.Negative-working planographic printing plates (type N-250, manufacturer: Enco Printing Products Division of Hoechst Celanese Corporation) are used for the evaluation of the solution produced in this way. The N-250 plate is exposed, developed and used in a sheet-fed press (Heidelberg SORK brand), delivering prints of acceptable quality. The machine is stopped and the plate is scratched at four locations across the non-image areas. This is intended to simulate conditions that often occur when handling printing plates in the machine rooms. When printing on, it becomes apparent that the plate takes on ink at the scratched areas and also reproduces it on the printed sheet. After stopping the machine again, proceed as follows: one scratched area remains untreated, the second scratch is treated with the solution prepared in this example, the third is treated with a washing solution for offset cloths consisting of a mixture from hydrocarbons ( (R) Varn-120) and then treated with the solution from this example, and the fourth is first with a protective, preservation and cleaning solution ( (R) FPC, an emulsion of an aqueous phase with a hydrophilic , high molecular compound and an oil phase with organic solvents, manufacturer: Enco Printing Products Division of Hoechst Celanese Corporation) and then treated with the solution from this example. Then printing continues. In the untreated area, the scratch mark continues to print. The three treated areas print with no sign of a scratched surface. After 5000 prints, the area treated with the solution from this example shows very little ink acceptance. The other two treated areas print flawlessly until the end of the print run of 230,000 prints.
Eine Prüfung ergibt, daß bei nur mit der Waschlösung für Offsettücher (R)Varn-120 und/oder mit (R)FPC behandelten Kratzstellen auf dem Plattenhintergrund die Wiedergabe dieser Kratzstellen auf dem Druckbogen nicht verhindert wird.A test shows that scratches on the plate background treated only with the wash solution for offset cloths (R) Varn-120 and / or with (R) FPC do not prevent the reproduction of these scratches on the printed sheet.
Ein als Korrekturmittel für Kratzer bekanntes Produkt ((R)Plate Fix, Hersteller: Allied Photo Supply Corp., Hollywood, Fla.) wird wie in Beispiel 1 beschrieben geprüft. Die Ergebnisse der Prüfung zeigen, daß die unbehandelte verkratzte Stelle in unannehmbarer Weise druckt. Auch der nur mit (R)Plate Fix behandelte Bereich liefert schlechte Druckergebnisse. Die zunächst gereinigte ((R)Varn-120) dann behandelte ((R)Plate Fix) Stelle druckt anfangs eine geringe Menge und mit fortschreitender Druckauflage immer mehr Druckfarbe ab. Die mit (R)FPC und anschließend mit (R)Plate Fix behandelte Stelle ergibt einwandfreie Drucke. Nach Herstellung von weiteren 5000 Bögen beginnt der verkratzte Bereich jedoch zu drucken.A product known as a correction agent for scratches ( (R) Plate Fix, manufacturer: Allied Photo Supply Corp., Hollywood, Fla.) Is tested as described in Example 1. The results of the test show that the untreated scratched area is unacceptable prints. Even the area treated with (R) Plate Fix only gives poor printing results. The initially cleaned ( (R) Varn-120) then treated ( (R) Plate Fix) initially prints a small amount and with increasing print run more and more printing ink. The area treated with (R) FPC and then with (R) Plate Fix produces perfect prints. After making another 5000 sheets, the scratched area begins to print.
Claims (9)
- Liquid composition for correcting scratches in the non-image areas of printing plates having a metal support, especially of aluminium, comprisinga) 0.25 to 10.0% of trisodium phosphate, tripotassium phosphate or trilithium phosphate,b) 0.25 to 5.0% of sodium metasilicate,c) 0.10 to 5.0% of an arylphenol ethoxylate andd) 80.0 to 99.4% of water.
- Composition according to Claim 1, characterised in that component a) is trisodium phosphate.
- Composition according to one of Claims 1 or 2, characterised in that component a) is present in an amount from 0.5 to 5.0%.
- Composition according to one of Claims 1 to 3, characterised in that component b) is present in an amount from 0.5 to 5.0%.
- Composition according to one of Claims 1 to 4, characterised in that component c) is a potassium salt of a phosphated alkoxylated arylphenol.
- Composition according to one of Claims 1 to 5, characterised in that component c) is present in an amount from 0.2 to 3.0%.
- Composition according to one of Claims 1 to 6, characterised in that component d) is present in an amount from 89.0 to 98.8%.
- Method for correcting scratches in the non-image areas of printing plates with metal supports, characterised in that the developed plate showing scratches in the non-image areas is treated with a liquid composition according to Claims 1 to 7.
- Method according to Claim 8, characterised in that the plate is treated with a cleaning solution known per se before the treatment with the liquid composition.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/056,180 US4778616A (en) | 1987-06-01 | 1987-06-01 | Scratch corrector for lithographic printing plates |
| US56180 | 1987-06-01 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0293596A2 EP0293596A2 (en) | 1988-12-07 |
| EP0293596A3 EP0293596A3 (en) | 1989-03-15 |
| EP0293596B1 true EP0293596B1 (en) | 1991-11-06 |
Family
ID=22002704
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88106639A Expired - Lifetime EP0293596B1 (en) | 1987-06-01 | 1988-04-26 | Correction fluid and process for the treatment of scratches on lithographic printing plates |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4778616A (en) |
| EP (1) | EP0293596B1 (en) |
| JP (1) | JPS63312193A (en) |
| DE (1) | DE3866028D1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5342435A (en) * | 1992-09-25 | 1994-08-30 | Eastman Kodak Company | Scratch remover and desensitizer composition for use with lithographic printing plates |
| US5965326A (en) * | 1997-01-21 | 1999-10-12 | Presstek, Inc. | Method for selectively deleting undesired ink-receptive areas on wet lithographic printing constructions incorporating metallic inorganic layers |
| GB9710552D0 (en) * | 1997-05-23 | 1997-07-16 | Horsell Graphic Ind Ltd | Planographic printing |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3394653A (en) * | 1965-10-12 | 1968-07-30 | Robert E. Riesberg | Novel method of cleaning paper planographic plates |
| US3462520A (en) * | 1966-10-14 | 1969-08-19 | Gaf Corp | Phosphate esters of alkoxylated straight-chain primary alcohols |
| US3882038A (en) * | 1968-06-07 | 1975-05-06 | Union Carbide Corp | Cleaner compositions |
| US3679479A (en) * | 1970-01-07 | 1972-07-25 | Eastman Kodak Co | Washout-preservative for lithographic printing plates |
| US3887497A (en) * | 1973-03-15 | 1975-06-03 | George B Ulvild | Liquid cleansing composition and method of producing |
| US4028281A (en) * | 1975-12-08 | 1977-06-07 | Scott Paper Company | Metal plate treating solution |
| CA1090189A (en) * | 1976-05-03 | 1980-11-25 | American Hoechst Corporation | Lithographic plate finisher comprising a solvent phase and an aqueous phase containing tapioca dextrin |
| US4234443A (en) * | 1978-03-24 | 1980-11-18 | Michael A. Canale | Composition and a method useful for making a fountain solution for lithographic printing operations |
| US4374920A (en) * | 1981-07-27 | 1983-02-22 | American Hoechst Corporation | Positive developer containing non-ionic surfactants |
| US4664721A (en) * | 1981-12-07 | 1987-05-12 | Intercontinental Chemical Corporation | Printing screen cleaning and reclaiming compositions |
| US4539134A (en) * | 1982-12-02 | 1985-09-03 | Halliburton Company | Methods and cleaning compositions for removing organic materials from metallic surfaces |
| US4504406A (en) * | 1983-02-22 | 1985-03-12 | American Hoechst Corporation | Cleansing agent for printing plates |
| JPS60147395A (en) * | 1984-01-12 | 1985-08-03 | Fuji Photo Film Co Ltd | Plate surface cleaning agent for planographic plate |
-
1987
- 1987-06-01 US US07/056,180 patent/US4778616A/en not_active Expired - Lifetime
-
1988
- 1988-04-26 DE DE8888106639T patent/DE3866028D1/en not_active Expired - Fee Related
- 1988-04-26 EP EP88106639A patent/EP0293596B1/en not_active Expired - Lifetime
- 1988-05-31 JP JP63131785A patent/JPS63312193A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP0293596A2 (en) | 1988-12-07 |
| JPS63312193A (en) | 1988-12-20 |
| US4778616A (en) | 1988-10-18 |
| EP0293596A3 (en) | 1989-03-15 |
| DE3866028D1 (en) | 1991-12-12 |
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