GB1575200A - Printing plates - Google Patents

Printing plates Download PDF

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Publication number
GB1575200A
GB1575200A GB4808575A GB4808575A GB1575200A GB 1575200 A GB1575200 A GB 1575200A GB 4808575 A GB4808575 A GB 4808575A GB 4808575 A GB4808575 A GB 4808575A GB 1575200 A GB1575200 A GB 1575200A
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Prior art keywords
plate
method according
water
sulphonate
composition
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Expired
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GB4808575A
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Vickers Ltd
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Vickers Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41NPRINTING 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 In this subclass the COPES System is used
    • B41N3/00Preparing for use and conserving printing surfaces
    • B41N3/08Damping; Neutralising or similar differentiation treatments for lithographic printing formes; Gumming or finishing solutions, fountain solutions, correction or deletion fluids, or on-press development
    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY
    • G03FPHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/26Processing photosensitive materials; Apparatus therefor
    • G03F7/40Treatment after imagewise removal, e.g. baking

Description

(54) IMPROVEMENTS IN OR RELATING TO PRINTING PLATES (71) We, VICKERS LIMITED, a British Company, of Vickers House, Millbank Tower, Millbank, London SW1 4PRA, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to lithographic printing plates.

As is well known, lithographic printing depends on the immiscibility of oil and water. Thus, a lithographic printing plate needs ot have image areas which attract greasy inks and repel water (i.e. oleophilic areas) and non-image areas which attract water and repel greasy inks (i.e. hydrophilic areas). Also, it is well known to increase any natural hydrophilic properties of the non-image areas by suitable treatments, commonly known as "desensitizing" or "gumming" treatments.

Lithographic printing plates are conventionally produced from radiation-sensitive plates by image-wise exposing the radiationsensitive coating of the plate and developing the plate to remove the relatively more soluble areas of the image-wise exposed coating. The less soluble areas which remain on the plate substrate constitute the image and the areas of the substrate revealed on development constitute the non-image areas of the plate.

It is well known that the life of certain types of printing plates can be increased by heating ("burning-in") the plate to harden the image areas. However, such heating can cause the non-image areas to be coated with contaminating residues which are oleophilic so that parts of the non-image areas are no longer hydrophilic. These contaminating residues can only be removed from the plate with difficulty. If, however, they are not removed the contaminated parts of the nonimage areas pick up ink during printing and produce a condition known as. "scumming".

In order to prevent such scumming, it is proposed, in United Kingdom Patent Specifications No. 699,412 and No. 1,154,749, to treat the plate, after the heating step, with a further developer to remove the con taminating residues. An alternative solution is described in our co-pending Patent Application No. 30264/74, where there is disclosed and claimed, in a method of treating a plate comprising a substrate carrying an image which method comprises the step of heating the plate, the improvement which comprises providing a protective barrier layer on the plate prior to the heating step so as to prevent contaminating residues contacting the plate during the heating step.

The present invention concerns a modification of the invention of our Patent Application No. 30264/74 Serial No.

1,531,368 and provides for the inclusion in the barrier layer of a desensitising colloid.

According to the present invention, there is provided a method of processing a radiation sensitive plate comprising a substrate coated with a radiation-sensitive material, which method comprises: (i) image-wise exposing the radiation sensitive material to radiation so that it includes radiation struck areas and non radiation struck areas of differing solu bility, (ii) developing the image-wise exposed layer to selectively remove the more soluble of the areas and reveal the substrate underlying these areas, (iii) treating the plate with a composition which comprises a water-soluble colloid and a water-soluble or water-dispersible material capable of forming a barrier layer on the non-image areas of the plate, which barrier layer is capable of preventing contaminating residues con tacting the non-image areas during the heating of the plate and is capable of being removed from the plate after heat ing by washing with water, (iv) heating the plate to harden the areas remaining on the substrate, and (v) washing the plate to remove the bar rier layer.

Preferably, the colloid is gum arabic or other suitable arabinogalactan, sodium carboxy methyl cellulose, or an alginate such as an alkali metal or ammonium alginate. The material capable of forming the barrier layer is preferably a water-soluble salt such as an ionic surfactant such as the sodium salt of dodecyl benzene sulphonate, the sodium salt of dodecyl phenoxy benzene disulphonate, the sodium salt of decyl phenoxy benezene disulphonate or other alkyl aryl sulphonate; the sodium salt of an alkyl naphthalene sulphonate, the disodium salt of the condensation product of formaldehyde and methylene dinaphthalene sulphonate, or other naphthalene sulphonate; and ammonium or potassimu perfluoro alkyl sulphonate or other perfluoro alkyl sulphonate; or a dialkyl sulphosuccinate such as sodium dioctyl sulphosuccinate or sodium dimethyl amyl sulphosuccinate. In the case where the material forming the barrier layer is water dispersible, as opposed to water soluble, this may be, for example, colloidal silica or colloidal alumina.

Generally the composition of the present invention should consist of at least 70% by volume of barrier layer forming material and not more than 30% by volume of colloid.

Compositions comprising from 2 to 15% by volume of colloid and from 98 to 85% by volume of barrier layer forming material are preferred.

In use of the composition of the present invention it is applied to the exposed and developed plate generally in aqueous form i.e. in the form of an aqueous solution or dispersion. In such a case the aqueous composition preferably comprises from 50 to 90% by volume of water and from 10 to 50% by volume of colloid plus barrier forming material. The thus wetted plate is then wiped down to form a thin barrier layer of the composition on the plate. Thereafter the plate is heated to harden the image and washed with water to remove the layer and any contaminating residues formed on the layer during heating.

As stated in the specification of our Patent Application No. 30264/74, Serial No.

1,513,368, the barrier layer forming material must satisfy certain conditions as regards its effects on the substrate and the material of the image areas of the plate, as well as its ability to protect the substrate surface from contact by contaminating residues during heating and to remain in a form which it can be washed off with water after the heating step. Also, the barrier-forming material must be compatible with the colloid.

It is not fully understood why certain materials form a satisfactory barrier layer whilst other materials, even though similar, do not. However, whether a particular material will be satisfactory can be ascertained easily by treating part of a trial plate with the material, heating the plate under conditions so as to produce contaminating residues on the plate, washing the plate with water, and inking the plate. The degree of protection afforded by the treatment will be clearly apparent by comparison of the two parts of the plate.

The composition of the present invention has both densensitising and protective qualities. This is not to be expected since although colloids used in the composition are desensitising materials, they are also heat hardenable and it is well known that heating them to the temperature required to harden the image areas would ordinarily also cause them to harden and/or char so that they lose their hydrophilic properties and become oleophilic. Again, the reason why they do not harden in the presence of the barrier layer-forming material is not clearly understood, but one possibility is that the presence of the barrier layer-forming material prevents their cross-linking.

It has also been discovered that a composition according to the present invention can be used in aqueous medium as a desensitiser in conventional manner i.e. it can be used on plates which are not to be heated.

In such a way it is often possible to reduce the tendency for parts of the image to lose their oleophilic properties under certain circumstances and become reluctant to fully accept ink.

The following Examples illustrate the invention: Example I Six positive-working, Alympic, presensitised plates (denoted by references A to F) as supplied by the Howson-Algraphy Group of Vickers Ltd, and having anodised aluminium substrates and radiation-sensitive coatings comprising an orthoquinone diazide and a novolak resin were exposed under positive transparencies and developed with alkaline silicate developer. After washing and drying the plates were treated as follows: Plate A was heated in an oven for 20 minutes at 2300C, washed with water and densensitised with gum arabic in the usual way; Plate B was wiped over with phosphoric acid and then treated as Plate A; Plate C was treated as Plate B but after heating was thoroughly rubbed again with developer in accordance with British Patent Specification No. 1,154,749 and treated as plate A; Plate D was wiped over with a 45% aqueous solution of sodium dodecyl phenoxy benzene disulphonate (Dowfax 2A1) but was not heated.

Plate E was treated as Plate D and after heating was washed with water and desensitised as Plate A; Plate F was wiped over with a solution of 7% gum arabic in water containing 22% of solium dodecyl phenoxy benzene disulphonate and then heated and washed with water as Plate A.

The six plates were placed on a KORD offset printing press and the following results were observed: Plate A took up ink badly in the nonimage areas and was completely useless as a printing plate; Plate B took up ink in the non-image areas to a lesser degree than Plate A; Plate C produced good, clean copies without difficulty; Plate D took up ink slightly in the nonimage areas, the degree of ink take-up being about the same as that of a non-heated anodised plate that has been desensitised with silicate developer; Plate E produced good, clean copies without difficulty; Plate F produced good clean copies without difficulty.

(The words ALYMPIC and DOWFAX are Trade Marks.) Example 2 An Alympic Gold plate was exposed and developed in the same way as in Example 1 and after washing and drying was wiped over with an aqueous solution containing 10% of sodium dodecyl phenoxy benzene disulphonate and 4% carboxy methyl cellulose.

The plate was heated in an oven at 2500C for ten minutes, washed with water and placed on a lithographic press. Good clean copies were obtained without difficulty.

Example 3 Example 2 was repeated using the following aqueous solutions to treat the plate before the heating step: i) 4% sodium alginate and 30% of a sodium dodecyl benzene sulphonate (Arylan SBC25); ii) 22% ammonium alginate and 22% of sodium decyl phenoxy benzene disul phonate; (Dowfax 3B2) iii) 4% carboxy methyl cellulose and 20% of sodium alkyl naphthalene sulphonate; (Perminal BX) iv) 2-'-% ammonium alginate and 30% of the condensation product of formalde hyde and methylene dinaphthalene sul phonate (Dispersol T).

(The words PERMINAL and DISPER SOL are Trade Marks.) Results similar to those of Example 2 were obtained.

Example 4 Example 2 was repeated, and similar results were obtained using the following aqueous solutions to treat the plate before the heating step: i) 4% gum arabic and 30% of ammonium perfluoroalkyl sulphonate (Fluorad FC 95; ii) 4% gum arabic and 30% of potassium perfluoroalkyl sulphonate (Fluorad FC 98); iii) 3% ammonium alginate and 35% of sodium dioctyl sulphosuccinate (Alcopol 0).

iv) 4% gum arabic and 35% of sodium di methyl amyl) sulphosuccinate (Manascol MA).

(The words FLUORAD and ALCOPOL are Trade Marks.) Example 5 Example 2 was repeated with similar results using a mixture comprising 90% colloidal silica (Ludox AS) and 10% of an aqueous 20% gum arabic solution.

Example 6 Presensitised, positive-working plates (denoted by references H to L) having a scratchbrush grained aluminium substrates and a sensitive coating containing a quinone diazide and a novolak resin were exposed and developed as in Example 1 and treated as follows: Plate H was heated in an oven for 10 minutes at 2500 C, washed with water and densensitised with gum arabic in the usual way; Plate I was wiped over with a solution of 7% gum arabic in water containing 22% of sodium dodecyl phenoxy benzene disulphonate, and then heated and washed with water as Plate H; Plate J was wiped over with a solution containing 4% ammonium alginate and 30% of ammonium perfluoroalkyl sulphonate and then heated and washed with water as Plate A; Plate K was wiped over with a 4% solution containing carboxy methyl cellulose and 35% of sodium dioctyl sulphosuccinate, and then heated and washed with water as Plate A; Plate L was wiped over with a mixture of 90% colloidal silica and 10% of an aqueous 20% gum arabic solution and then heated and washed with water as Plate A.

The five plates were placed on an offset printing press and it was observed that whereas Plate H scummed badly and was useless as a printing plate, Plates I to L produced good, clean copies without difficulty.

Example 7 A presensitised, negative-working plate comprising a grained, anodised aluminium substrate and a sensitive layer of poly(vinyl cinnamate) was exposed beneath a negative and developed with 2 methoxy ethyl acetate.

The plate was washed and whilst still moist was treated with an emulsion reinforcing lacquer containing a novolak resin. After further washing the plates were treated as Plates I to L in Example 6 and similar results were observed when the plates were placed on an offset press.

Example 8 A photopolymer presensitised grained and anodised aluminium lithographic plate, known as Super Sensalith supplied by Vickers Ltd., was exposed in contact with a line negative in the customary manner and developed in an automatic processing machine. This machine possessed two sections; the first section was filled with "Prodev 'M'" solvent developer supplied by Vickers Ltd., and the second section was filled with water containing 40% of sodium dodecyl phenoxy benzene disulphonate and 5% gum arabic.

The word PRODEV is a Trade Mark.) A spray water washing section was located in between the two sections.

The plate was heated for 10 minutes in an oven at a temperature of 200"C to thoroughly dry and harden the image before the plate was fastened to the cylinder of a web-offset printing press.

Mere washing with water was necessary before a run of 51,000 good copies was obtained.

Example 9 A photopolymer presensitised aluminium negative-working plate known as Super Sensalith supplied by Vickers was exposed and then developed and processed with emulsion developer in accordance with British Patent Specification No. 921,529, and fastened to the appropriate cylinder of a Rotaprint R30/90 small offset printing press, whereupon 5,000 satisfactory copies were taken. After this, the ink was removed with white spirit and the plate was treated with a solution comprising 7% gum arabic in water and 22% of sodium dodecyl phenoxy benzene disulphonate. After storing over a weekend i.e. some 60 hours, printing was recommenced without difficulty. An identical plate treated with an aqueous solution of 15% gum arabic, and containing no - surfact- ant, caused difficulties and delays in up-take of ink when printing was recommenced after a similar storage period. (The words SEN SALITH and ROTAPRINT are Trade Marks.) WHAT WE CLAIM IS:- 1. A method of processing a radiationsensitive plate comprising a substrate coated with a radiation-sensitive material which method comprises: (i) image-wise exposing the radiation sensitive material to radiation so that it includes radiation struck areas and non radiation struck areas of differing solu bility, (ii) developing the image-wise exposed layer to selectively remove the more soluble of the areas and reveal the substrate underlying these areas, (iii) treating the plate with a composition which comprises a water-soluble colloid and a water-soluble or water-dispersible material capable of forming a barrier layer on the non-image areas of the plate, which barrier layer is capable of preventing contaminating residues - con- tacting the non-image areas during the heating of the plate and is capable of being removed from the plate after heat ing by washing with water, (iv) heating the plate to harden the areas remaining on the substrate, and (v) washing the plate to remove the bar rier layer.

2: A method according to Claim 1, wherein the colloid is an arabinogalactan.

3. A method according to Claim 2 wherein the arabinogalactan is gum arabic.

4. A method according to Claim 1 wherein the- colloid is sodium carboxy methyl cellulose.

5. A method according to Claim 1 wherein the colloid is an alginate.

6. A method according to Claim 5 wherein the alginate is an alkali metal alginate.

7. A method according to Claim 5 wherein the alginate is ammonium alginate.

8. A method according to any one of the preceding claims wherein the barrier layer-forming material is water-soluble and is a salt.

9. A method according to Claim 8 wherein the salt is an ionic surfactant.

10. A method according to Claim 9 wherein the surfactant is an alkyl aryl sulphonate.

11. A method according to Claim 10 wherein the alkyl aryl sulphonate is an alkyl benzene sulphonate.

12. A method according to Claim 11 wherein the alkyl benzene sulphonate is a sodium salt of dodecyl benzene sulphonate or a sodium salt of dodecyl phenoxybenzene disulphonate.

13. A method according to Claim 11 wherein the alkyl benzene sulphonate is a sodium salt of decyl phenoxybenzene disulphonate.

14 A method according to Claim 9 wherein the surfactant is a naphthalene sulphonate.

15. A method according ~ to Claim 14

**WARNING** end of DESC field may overlap start of CLMS **.

Claims (32)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    substrate and a sensitive layer of poly(vinyl cinnamate) was exposed beneath a negative and developed with 2 methoxy ethyl acetate.
    The plate was washed and whilst still moist was treated with an emulsion reinforcing lacquer containing a novolak resin. After further washing the plates were treated as Plates I to L in Example 6 and similar results were observed when the plates were placed on an offset press.
    Example 8 A photopolymer presensitised grained and anodised aluminium lithographic plate, known as Super Sensalith supplied by Vickers Ltd., was exposed in contact with a line negative in the customary manner and developed in an automatic processing machine. This machine possessed two sections; the first section was filled with "Prodev 'M'" solvent developer supplied by Vickers Ltd., and the second section was filled with water containing 40% of sodium dodecyl phenoxy benzene disulphonate and 5% gum arabic.
    The word PRODEV is a Trade Mark.) A spray water washing section was located in between the two sections.
    The plate was heated for 10 minutes in an oven at a temperature of 200"C to thoroughly dry and harden the image before the plate was fastened to the cylinder of a web-offset printing press.
    Mere washing with water was necessary before a run of 51,000 good copies was obtained.
    Example 9 A photopolymer presensitised aluminium negative-working plate known as Super Sensalith supplied by Vickers was exposed and then developed and processed with emulsion developer in accordance with British Patent Specification No. 921,529, and fastened to the appropriate cylinder of a Rotaprint R30/90 small offset printing press, whereupon 5,000 satisfactory copies were taken. After this, the ink was removed with white spirit and the plate was treated with a solution comprising 7% gum arabic in water and 22% of sodium dodecyl phenoxy benzene disulphonate. After storing over a weekend i.e. some 60 hours, printing was recommenced without difficulty. An identical plate treated with an aqueous solution of 15% gum arabic, and containing no - surfact- ant, caused difficulties and delays in up-take of ink when printing was recommenced after a similar storage period. (The words SEN SALITH and ROTAPRINT are Trade Marks.) WHAT WE CLAIM IS:- 1. A method of processing a radiationsensitive plate comprising a substrate coated with a radiation-sensitive material which method comprises: (i) image-wise exposing the radiation sensitive material to radiation so that it includes radiation struck areas and non radiation struck areas of differing solu bility, (ii) developing the image-wise exposed layer to selectively remove the more soluble of the areas and reveal the substrate underlying these areas, (iii) treating the plate with a composition which comprises a water-soluble colloid and a water-soluble or water-dispersible material capable of forming a barrier layer on the non-image areas of the plate, which barrier layer is capable of preventing contaminating residues - con- tacting the non-image areas during the heating of the plate and is capable of being removed from the plate after heat ing by washing with water, (iv) heating the plate to harden the areas remaining on the substrate, and (v) washing the plate to remove the bar rier layer.
  2. 2: A method according to Claim 1, wherein the colloid is an arabinogalactan.
  3. 3. A method according to Claim 2 wherein the arabinogalactan is gum arabic.
  4. 4. A method according to Claim 1 wherein the- colloid is sodium carboxy methyl cellulose.
  5. 5. A method according to Claim 1 wherein the colloid is an alginate.
  6. 6. A method according to Claim 5 wherein the alginate is an alkali metal alginate.
  7. 7. A method according to Claim 5 wherein the alginate is ammonium alginate.
  8. 8. A method according to any one of the preceding claims wherein the barrier layer-forming material is water-soluble and is a salt.
  9. 9. A method according to Claim 8 wherein the salt is an ionic surfactant.
  10. 10. A method according to Claim 9 wherein the surfactant is an alkyl aryl sulphonate.
  11. 11. A method according to Claim 10 wherein the alkyl aryl sulphonate is an alkyl benzene sulphonate.
  12. 12. A method according to Claim 11 wherein the alkyl benzene sulphonate is a sodium salt of dodecyl benzene sulphonate or a sodium salt of dodecyl phenoxybenzene disulphonate.
  13. 13. A method according to Claim 11 wherein the alkyl benzene sulphonate is a sodium salt of decyl phenoxybenzene disulphonate.
  14. 14 A method according to Claim 9 wherein the surfactant is a naphthalene sulphonate.
  15. 15. A method according ~ to Claim 14
    wherein the naphthalene sulphonate is a sodium salt of an alkyl naphthalene sulphonate.
  16. 16. A method according to Claim 14 wherein the naphthalene sulphonate is a dissodium salt of the condensation product of formaldehyde and methylene dinaphthalene sulphonate.
  17. 17. A method according to Claim 9 wherein the surfactant is a perfluoroalkyl sulphonate.
  18. 18. A method according to Claim 17 wherein the perfluoroalkyl sulphonate is ammonium or potassium perfluoroalkyl sulphonate.
  19. 19. A method according to Claim 9 wherein the surfactant is a dialkyl sulphosuccinate.
  20. 20. A method according to Claim 19 wherein the dialkyl sulphosuccinate is sodium dioctyl sulphosuccinate or sodium di- (methyl amyl)sulphosuccinate.
  21. 21. A method according to any one of Claims 1 to 7 wherein the barrier forming material is water-dispersible and is colloidal silica or colloidal alumina.
  22. 22. A method according to any one the preceding claims wherein said composition comprises at least 70% by volume of barrier layer forming material and not more than 30% by volume of colloid.
  23. 23. A method according to Claim 22 wherein said composition comprises from 2 to 15% by volume of colloid and from 98 to 85% by volume of barrier layer forming material.
  24. 24. A method according to Claim 1 substantially as hereinbefore described in Example 8 or 9.
  25. 25. A method according to Claim 1 substantially as hereinbefore described in any one of Examples 1 to 7.
  26. 26. A plate whenever processed by the method claimed in any one of Claims 1 to 25.
  27. 27. A composition suitable for use in the method of Claim 22 which comprises a water-soluble colloid and a water soluble or water-dispersible material capable of forming a barrier layer on the non-image areas of the plate, which barrier layer is capable of preventing contaminating residues contacting the non-image areas during the heating of the plate and is capable of being removed from the plate after heating by washing with water, said composition comprising at least 70% by volume of barrier layer forming material and not more than 30% by volume of colloid.
  28. 28. A composition as claimed in Claim 27 which comprises from 2 to 15% by volume of colloid and from 98 to 85% by volume of barrier layer forming material.
  29. 29. An aqueous composition comprising from 50 to 90% by volume of water and from 10 to 50% by volume of a composition as claimed in Claim 27 or 28.
  30. 30. A composition as claimed in Claim 27 substantially as hereinbefore described in Example 8 or 9.
  31. 31. A composition as claimed in Claim 27 substantially as hereinbefore described in any one of Examples 1 to 7.
  32. 32. A lithographic printing plate when treated with a composition as claimed in any one of Claims 27 to 31.
GB4808575A 1977-02-21 1977-02-21 Printing plates Expired GB1575200A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2438857A1 (en) * 1978-10-10 1980-05-09 Polychrome Corp Method for producing a lithographic printing plate and plate obtained by such process
FR2506679A1 (en) * 1981-06-01 1982-12-03 Polychrome Corp Process for the protection of lithographic printing plates and plate thus obtained
EP0112653A2 (en) * 1982-11-24 1984-07-04 Toray Industries, Inc. Dry planographic plate
EP0115414A2 (en) * 1983-01-28 1984-08-08 W.R. Grace K.K. Treatment of resin based printing plates
EP0247153A1 (en) * 1985-11-27 1987-12-02 Macdermid, Incorporated Thermally stabilized photoresist images
US4786581A (en) * 1984-03-22 1988-11-22 Hoechst Aktiengesellschaft Gumming solution for use in the burning-in of offset-printing plates comprising water, a hydrophilic polymer and an organic acid derivative
EP0407081A2 (en) * 1989-07-05 1991-01-09 Horsell Plc Lithoplate production
US5168813A (en) * 1988-09-30 1992-12-08 Horsell Plc Baking treatment of lithographic printing plate
US5180654A (en) * 1988-11-29 1993-01-19 E. I. Du Pont De Nemours And Company Processing radiation sensitive members with aqueous ethyl hexyl sulphate treatment prior to burn-in step
US5609993A (en) * 1991-04-17 1997-03-11 Nippon Paint Co., Ltd. Process for producing lithographic printing plate, photosensitive plate and aqueous ink composition therefor
WO2002056113A2 (en) * 2001-01-16 2002-07-18 Osram Opto Semiconductors Gmbh Method for producing an etching mask

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2438857A1 (en) * 1978-10-10 1980-05-09 Polychrome Corp Method for producing a lithographic printing plate and plate obtained by such process
FR2506679A1 (en) * 1981-06-01 1982-12-03 Polychrome Corp Process for the protection of lithographic printing plates and plate thus obtained
EP0112653A2 (en) * 1982-11-24 1984-07-04 Toray Industries, Inc. Dry planographic plate
EP0112653A3 (en) * 1982-11-24 1985-08-28 Toray Industries, Inc. Dry planographic plate
EP0115414A2 (en) * 1983-01-28 1984-08-08 W.R. Grace K.K. Treatment of resin based printing plates
EP0115414A3 (en) * 1983-01-28 1985-07-03 W.R. Grace K.K. Treatment of resin based printing plates
US4786581A (en) * 1984-03-22 1988-11-22 Hoechst Aktiengesellschaft Gumming solution for use in the burning-in of offset-printing plates comprising water, a hydrophilic polymer and an organic acid derivative
EP0247153A4 (en) * 1985-11-27 1988-05-19 Macdermid Inc Thermally stabilized photoresist images.
EP0247153A1 (en) * 1985-11-27 1987-12-02 Macdermid, Incorporated Thermally stabilized photoresist images
US5168813A (en) * 1988-09-30 1992-12-08 Horsell Plc Baking treatment of lithographic printing plate
US5180654A (en) * 1988-11-29 1993-01-19 E. I. Du Pont De Nemours And Company Processing radiation sensitive members with aqueous ethyl hexyl sulphate treatment prior to burn-in step
EP0407081A2 (en) * 1989-07-05 1991-01-09 Horsell Plc Lithoplate production
EP0407081A3 (en) * 1989-07-05 1991-04-17 Cookson Group Plc Lithoplate production
US5609993A (en) * 1991-04-17 1997-03-11 Nippon Paint Co., Ltd. Process for producing lithographic printing plate, photosensitive plate and aqueous ink composition therefor
WO2002056113A2 (en) * 2001-01-16 2002-07-18 Osram Opto Semiconductors Gmbh Method for producing an etching mask
WO2002056113A3 (en) * 2001-01-16 2002-09-19 Osram Opto Semiconductors Gmbh Method for producing an etching mask

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Effective date: 19950630