EP0952924A1 - Flachdruckplatten - Google Patents
FlachdruckplattenInfo
- Publication number
- EP0952924A1 EP0952924A1 EP98900616A EP98900616A EP0952924A1 EP 0952924 A1 EP0952924 A1 EP 0952924A1 EP 98900616 A EP98900616 A EP 98900616A EP 98900616 A EP98900616 A EP 98900616A EP 0952924 A1 EP0952924 A1 EP 0952924A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- plate precursor
- printing plate
- lithographic printing
- precursor according
- infra
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C1/00—Forme preparation
- B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
- B41C1/1008—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by removal or destruction of lithographic material on the lithographic support, e.g. by laser or spark ablation; by the use of materials rendered soluble or insoluble by heat exposure, e.g. by heat produced from a light to heat transforming system; by on-the-press exposure or on-the-press development, e.g. by the fountain of photolithographic materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
- B41C2210/02—Positive working, i.e. the exposed (imaged) areas are removed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
- B41C2210/04—Negative working, i.e. the non-exposed (non-imaged) areas are removed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
- B41C2210/06—Developable by an alkaline solution
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
- B41C2210/22—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by organic non-macromolecular additives, e.g. dyes, UV-absorbers, plasticisers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
- B41C2210/24—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by a macromolecular compound or binder obtained by reactions involving carbon-to-carbon unsaturated bonds, e.g. acrylics, vinyl polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
- B41C2210/00—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation
- B41C2210/26—Preparation or type or constituents of the imaging layers, in relation to lithographic printing forme preparation characterised by a macromolecular compound or binder obtained by reactions not involving carbon-to-carbon unsaturated bonds
- B41C2210/262—Phenolic condensation polymers, e.g. novolacs, resols
Definitions
- This invention relates in particular to radiation sensitive lithographic plates which can be used in a computer-to-plate process but which also can be imagewise exposed through a photographic mask to UN. light.
- composition described in this application comprises 1) a novolac resin, 2) a resole resin, 3) a latent Bronsted acid and an infra-red absorber.
- a lithographic printing plate precursor comprising on a support a radiation sensitive composition which comprises (1) a novolac resin, (2) a condensing agent for the novolac resin which is either a methylol polyvinyl phenol compound or a bis hydroxymethyl compound, (3) a radiation sensitive latent acid generating compound and (4) an infra-red absorbing compound or an infra-red sensitising dye.
- a radiation sensitive composition which comprises (1) a novolac resin, (2) a condensing agent for the novolac resin which is either a methylol polyvinyl phenol compound or a bis hydroxymethyl compound, (3) a radiation sensitive latent acid generating compound and (4) an infra-red absorbing compound or an infra-red sensitising dye.
- the novolac resins derived from m-cresol and formaldehyde are useful.
- a particularly suitable bis hydroxymethyl condensing agent is 2,6-bis(hydroxymethyl)-p-cresol.
- a particularly suitable methylol polyvinyl phenol compound is a copolymer of the following structure:
- Suitable latent acid generating compounds are latent Bronsted acids and haloalkyl-substituted-s-triazines.
- latent Bronsted acid generators are iodonium, sulphonium, phosphonium selenonium, diazonium and arsonium salts and particularly salts of fluorophosphoric acid.
- haloalkyl-substituted-s-triazine is used, as the latent acid generating compound preferably it is of the formula:-
- R 1 is a substituted or unsubstituted aliphatic or aromatic group
- R 2 and R 3 are each a trihaloalkyl group.
- a particularly useful diazonium salt for use as an acid generator (acid generator A) is the compound of formula: -
- Diazonium salts are decomposed by U.V. light to liberate an acid but as diazonium salts can not be light-sensitised they are not decomposed by infra-red light. However, if an infra-red absorber is present in the composition which converts infra-red light to heat then the diazonium salts which are heat sensitive are decomposed as in the examples which follow.
- Carbon black is a useful infra-red absorbing agent which converts infra-red radiation to heat.
- Other pigments can also be used.
- infra-red sensitising dyes examples include dyes of the following classes, squarylium, croconate, cyanine, merocyanine, indolizine, pyrylinium or a metal dithiolene dye.
- composition of the present invention is of particular use because it can be UV imaged in the normal manner using a mask or it can be imaged by a laser digitally. Also negative plates or direct positive plates can be prepared.
- a method of preparing a lithographic printing plate which comprises infra-red laser imaging a lithographic printing plate precursor as just set forth, heating the imaged plate overall and then subjecting the heated plate to development in an aqueous alkali solution to yield a negative working plate.
- the infra-red absorbing compound is one whose absorption spectrum is significant at the wavelength output of the laser which is to be used in the method of the present invention.
- gallium arsenide diode lasers emit at 830nm and Nd YAG lasers emit at 1064nm.
- the laser imaging of the plate followed by heat treatment hardens the composition imagewise.
- the unexposed composition on the plate is removed by the development step. This yields a negative image.
- the lithographic plate precursor of the present invention can be used to produce a direct positive plate.
- the plate is imagewise exposed through a mask to U.V. light or directly using a laser then developed.
- the exposed areas become alkali-soluble leaving the unexposed areas as the direct positive image.
- a heat insulator layer which attenuates the thermal conductivity to the base.
- the base is an aluminium plate base.
- the base In the preparation of an aluminium plate base for use in lithography there usually forms on the base a thin layer of aluminium oxide which is often between 2 to 3 microns in thickness.
- a layer of aluminium oxide is formed which is from 10 to 15 microns in thickness.
- Such a thickness of aluminium oxide acts very efficiently as a heat insulation layer.
- the thickness of the aluminium oxide layer is much greater than 15 microns an unstable layer can be formed which tends to flake off.
- Thermal conduction from the imaging layer may also be reduced by optimisation of anodising conditions to produce an anodic sub-layer of low porosity and low thermal conductivity.
- Thermal conduction from the imaging layer may also be reduced by use of hydrophilising layers such as those described in E.P.A. 626273.
- infra-red absorber Preferably as much infra-red absorber is present in the photosensitive composition so as not to interfere with the alternative U.V. exposure method.
- Dyes with the selective IR absorption can be present in a greater amount than a black body such as carbon.
- the base which can be used as a lithographic base is preferably an aluminium plate which has undergone the usual anodic, graining and post-anodic treatments well known in the lithographic art for enabling a photosensitive composition to be coated thereon.
- Another base material which may be used in the method of the present invention is a plastics material base or a treated paper base as used in the photographic industry.
- a particularly useful plastics material base is polyethylene terephthalate which has been subbed to render its surface hydrophilic.
- a so-called resin coated paper which has been corona discharge treated may also be used.
- An example of a suitable practical developing solution is an aqueous solution of 8% metasilicate, 0.1% of an organic phosphate ester of an ethoxylated alcohol and 0.01% of polyoxylpropylane methyl ethyl ammonium chloride.
- the coated substrate to be imaged was cut into a circle of 105mm diameter and placed on a disc that could be rotated at a constant speed of 2500 revolutions per minute.
- Adjacent to the spinning disc a translating table held the source of the laser beam so that the laser beam impinged normal to the coated substrate, while the translating table moved the laser beam radially in a linear fashion with respect to the spinning disk.
- the exposed image was in the form of a spiral whereby the image in the centre of the spiral represented slow laser scanning speed and long exposure time and the outer edge of the spiral represented fast scanning speed and short exposure time.
- the laser used was a single mode 830nm wavelength 200mW laser diode which was focused to a 10 micron spot.
- the laser power supply was a stabilised constant current source.
- the exposed disc was developed by immersing in the alkaline developer solution which removed the non-imaged coating leaving the exposed spiral image.
- Exposure time quoted in the examples was the calculated time required for the laser to pass over a theoretical 10 micron square on the surface of the substrate and corresponded to an exposure sufficient to produce an image line that resisted the developer treatment.
- the precursors prepared in the present invention can also be UN. imaged to yield a positive working plate or can be reversal imaged to yield a negative working plate.
- the UN. source may be a carbon arc lamp, a mercury vapour lamp, a fluorescent lamp or a tungsten filament lamp.
- the imaged substrate was developed for 30 seconds.
- the latent acid generating compounds were : Acid generator A Acid generator B Acid generator C
- a solution containing 0.59g of 40% w/w novolak A in methoxypropanol, 0.24g polyvinyl phenol substituted with methylol groups, 0.055g of acid generator B, 0.22g of dye A, 3.09g of methoxypropanol and lg of DMF was prepared and coated onto a substrate consisting of a sheet of aluminium that had been electrograined and anodised, giving a coating weight of 1.3gm "2 after thoroughly drying at 100°C in an oven for 3 minutes.
- the resulting plate was imaged using a 200mW laser diode at a wavelength of 830nm using the imaging device described previously. The plate was then heated to 130°C for one minute. The plate was then developed using the alkaline developer B for 30 seconds which removed the parts of the coating on the plate that were not struck by the laser beam giving an image.
- the imaging energy density required to give a suitable image was 200mJ/cm '2 using developer B.
- a solution containing 0.59g of 40% w/w novolak A in methoxypropanol, 0.24g polyvinyl phenol substituted with hydroxymethyl groups, 0.055g of acid generator A, 0.22g of dye A, 3.09g of methoxypropanol and lg of DMF was prepared and coated onto a substrate consisting of a sheet of aluminium that had been electrograined and anodised, giving a coating weight of 1.3gm '2 after thoroughly drying at 100°C in an oven for 3 minutes.
- the resulting plate was imaged using a 200mW laser diode at a wavelength of 830nm using the imaging device described previously. The plate was then heated to 100°C for one minute. The plate was then developed using the alkaline developer B for 120 seconds which removed the parts of the coating on the plate that were not struck by the laser beam giving an image.
- the imaging energy density required to give a suitable image was 200mJ/cm "2 using developer B.
- a solution containing 1.18g of 40% w/w novolak B in methoxypropanol, 0.55g bis(hydroxymethyl)p-cresol, 0.055g of acid generator B 0.22g of dye A, 272g of methoxypropanol and lg of DMF was prepared and coated onto a substrate consisting of a sheet of aluminium that had been electrograined and anodised, giving a coating weight of 1.3gm "2 after thoroughly drying at 100°C in an oven for 3 minutes.
- the resulting plate was imaged using a 200mW laser diode at a wavelength of 830nm using the imaging device described previously. The plate was then heated to 100°C for one minute. The plate was then developed using the alkaline developer B for 120 seconds which removed the parts of the coating on the plate that were not struck by the laser beam giving an image.
- the imaging energy density required to give a suitable image was 200mJ/cm "2 using developer C.
- a solution containing 1.18g of 40% w/w novolak B in methoxypropanol, 0.55g bis(hydroxymethyl)p-cresol,0.055g of acid generator A 0.22g of dye A, 272g of methoxypropanol and lg of DMF was prepared and coated onto a substrate consisting of a sheet of aluminium that had been electrograined and anodised, giving a coating weight of 1.3gm "2 after thoroughly drying at 100°C in an oven for 3 minutes.
- a lithographic plate precursor as prepared in the examples could be imaged conventionally: a positive plate can be obtained by UV imaging and developing and a negative plate can be obtained by UV
- a solution containing 0.59g of 40% w/w novolak A in methoxypropanol, 0.59g of a 40% polyvinyl phenol (substituted with methylol groups) solution in methoxypropanol, 0.55g of a 10% solution of acid generator C in DMF, 0.022g of dye A, 1.51g of methoxypropanol and 1.73g of DMF was prepared and coated onto a substrate consisting of a sheet of aluminium that had been electrograined and anodised, giving a coating film weight of 1.3gm "2 after thoroughly drying at 100°C in an oven for 3 minutes.
- the resulting plate was imaged using a 200mW laser diode at a wavelength of 830nm using the imaging device described previously. The plate was then heated to 100°C for one minute. The plate was then developed using the alkaline developer C for 120 seconds which removed the parts of the coating on the plate that were not struck by the laser beam giving an image.
- the imaging energy density required to give a suitable image was 480mJ/cm "2 using developer B.
- a solution containing 1.18g of 40% w/w novolak B in methoxypropanol, 0.14g of a 40% solution of bis(hydroxymethyl)p-cresol in methoxypropanol, 0.055g of a 10% solution of acid generator C in DMF, 0.022g of dye A, 1.42g of methoxypropanol and 1.96g of DMF was prepared and coated onto a substrate consisting of a sheet of aluminium that had been electrograined and anodised, giving a coating film weight of 1.3gm "2 after thoroughly drying at 100°C in an oven for 3 minutes.
- Novolak B 1.18 81.8 bis(hydroxymethyl) p-cresol 0.55 9.6 acid generator C 0.02 4.8 dye A 0.022 3.8
- the resulting plate was imaged using a 200mW laser diode at a wavelength of 830nm using the imaging device described previously. The plate was then heated to 100°C for one minute. The plate was then developed using the alkaline developer C for 120 seconds which removed the parts of the coating on the plate that were not struck by the laser beam giving an image.
- the imaging energy density required to give a suitable image was 600mJ/cm "2 using developer B.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
- Materials For Photolithography (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9700877 | 1997-01-17 | ||
GB9700877A GB9700877D0 (en) | 1997-01-17 | 1997-01-17 | Lithographic plates |
PCT/GB1998/000132 WO1998031544A1 (en) | 1997-01-17 | 1998-01-15 | Lithographic plates |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0952924A1 true EP0952924A1 (de) | 1999-11-03 |
EP0952924B1 EP0952924B1 (de) | 2002-03-06 |
Family
ID=10806103
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98900616A Expired - Lifetime EP0952924B1 (de) | 1997-01-17 | 1998-01-15 | Flachdruckplatten |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0952924B1 (de) |
DE (1) | DE69804079T2 (de) |
GB (1) | GB9700877D0 (de) |
WO (1) | WO1998031544A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6555283B1 (en) * | 2000-06-07 | 2003-04-29 | Kodak Polychrome Graphics Llc | Imageable element and waterless printing plate |
US20130233190A1 (en) * | 2012-03-06 | 2013-09-12 | Presstek, Inc. | Lithographic imaging and printing with positive-working photoresponsive printing members |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01501176A (ja) * | 1986-10-20 | 1989-04-20 | マクダーミッド,インコーポレーテッド | 像反転可能なシステム及びプロセス |
US5296332A (en) * | 1991-11-22 | 1994-03-22 | International Business Machines Corporation | Crosslinkable aqueous developable photoresist compositions and method for use thereof |
DE69402232T2 (de) * | 1993-02-26 | 1997-09-18 | Ibm | Universaler negativ arbeitender Photoresist |
US5372915A (en) * | 1993-05-19 | 1994-12-13 | Eastman Kodak Company | Method of making a lithographic printing plate containing a resole resin and a novolac resin in the radiation sensitive layer |
-
1997
- 1997-01-17 GB GB9700877A patent/GB9700877D0/en active Pending
-
1998
- 1998-01-15 DE DE69804079T patent/DE69804079T2/de not_active Expired - Fee Related
- 1998-01-15 WO PCT/GB1998/000132 patent/WO1998031544A1/en active IP Right Grant
- 1998-01-15 EP EP98900616A patent/EP0952924B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9831544A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO1998031544A1 (en) | 1998-07-23 |
GB9700877D0 (en) | 1997-03-05 |
EP0952924B1 (de) | 2002-03-06 |
DE69804079D1 (de) | 2002-04-11 |
DE69804079T2 (de) | 2002-10-24 |
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