GB2277601A - Photosensitive negative material and composition therefor - Google Patents
Photosensitive negative material and composition therefor Download PDFInfo
- Publication number
- GB2277601A GB2277601A GB9408535A GB9408535A GB2277601A GB 2277601 A GB2277601 A GB 2277601A GB 9408535 A GB9408535 A GB 9408535A GB 9408535 A GB9408535 A GB 9408535A GB 2277601 A GB2277601 A GB 2277601A
- Authority
- GB
- United Kingdom
- Prior art keywords
- molecular weight
- compound
- light
- negative material
- maleic acid
- 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- Withdrawn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
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F3/00—Colour separation; Correction of tonal value
- G03F3/10—Checking the colour or tonal value of separation negatives or positives
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/016—Diazonium salts or compounds
- G03F7/021—Macromolecular diazonium compounds; Macromolecular additives, e.g. binders
- G03F7/0212—Macromolecular diazonium compounds; Macromolecular additives, e.g. binders characterised by the polymeric binder or the macromolecular additives other than the diazo resins or the polymeric diazonium compounds
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
Abstract
A photosensitive negative material comprises a support covered with a layer of a photosensitive composition, comprising at least one diazo compound sensitive to light of a wavelength between 180 and 550 nm, at least one dye which absorbs no more than 20% of above the light range, and a maleic acid copolymer. The material may be image-wise exposed to light, to exposed areas and the areas unexposed to light may be removed by water. The maleic acid copolymer may be ethylene or methyl vinyl ether/maleic acid copolymer and the dye may be a red or blue dye. The material may be used in colour proofing.
Description
PHOTOSENSITIVE NEGATIVE MATERIAL
AND COMPOSITION THEREFOR
This invention relates to an improved photosensitive negative material for producing colour proof sheets used for visualising the image in a multiple colour printing process before the lithographic plates are made. The invention also relates to a composition and process for the preparation of said negative material.
It is known that in the printing industry the term "negative material" denotes a pre-sensitised, transparent, coloured negative material developable with water or other aqueous solution, and which may be exposed in a customary contact printer and which may be used for colour proofing.
In a typical colour printing process, multiple usually four - colour separation negatives are made by means of a camera with colour filters. A different filter is used for each colour negative, and each filter allows only its complementary colour to pass. In a conventional process this produces cyan, magenta, yellow and black negatives.
The negatives are developed and then printed on metal and etched to produce the four colour printing plates.
Before producing the printing plates, a colour proofing process is used to visualise the colour image that will be obtained when the plates are made and printed.
In the colour proofing process, four colour overlays or colour proofs are made by taking a contact print of each colour negative with a colour proof sheet coated with photosensitive composition containing a dye colour matched to the colour of the printing ink that will be applied by the corresponding printing plate. - In this way, four overlays are obtained, corresponding to the cyan, magenta, yellow and black images that would be printed by the plates. The composite image may then be checked for colour, contrast etc, and any corrective action taken before the printing plates are made.
A variety of systems are known or have been proposed for the production of overlay proofing systems, see for example U.S. Patent Nos. 4,391,894 and 3,136,637.
The invention is not limited to colour proofing sheets and includes many other materials for use in applications where a photosensitive coating is exposed to an image and developed to remove the image or non-image areas. For example it extends to "keying" films for page assembly, in which the resin includes a blue dye.
A conventional negative material. comprises a thin, transparent, flexible, colourless and dimensionally stable film. The photosensitive composition in turn may typically comprise at least one diazo compound sensitive to light of a wavelength between approximately 180 and approximately 550 nm, a dye (usually red or blue) which absorbs no more than 20% of the light to which the above-mentioned diazo compound is sensitive and a high molecular weight organic compound which, in the areas exposed to light, may be cured by the photolysis products of the diazo compound and which may also be removed from areas unexposed to light with water or an aqueous solution. This final phase of removal of the transparent coloured layer from the areas unexposed to light is commonly known as development.
Image materials coloured with dyes which absorb no more than 20% of the light to which the diazo compound is sensitive are commonly known as "actinic materials".
The best known compositions for coloured, actinic, negatives developable with water are those in which the high molecular weight organic compound consists of polyvinyl alcohol. From a technical point of view, the above compositions give good results but the thickness of the photosensitive layer is still somewhat high and this is disadvantageous because, as is known, the thinner the photosensitive layer, the better is the photographic reproduction of the finest details.
Moreover, industrial production of these compositions is complicated by the fact that water must be used to solubilise polyvinyl alcohol and so extensive drying processes are required.
Industrial production of negatives based on polyvinyl alcohol comprises the following stages: - preparation of an aqueous polyvinyl alcohol solution,
preparation of a water-soluble photosensitive diazo
compound and of a suitable water-soluble dye ( e.g. red
or blue); - application of the said solution to a thin,
transparent, flexible, colourless and dimensionally
stable polymer film (usually a polyester); - evaporation of the water.
This final stage requires a rather long and costly drying tunnel, film advance is slow and energy consumption is high because temperatures of approximately 70-800C must be used.
A further disadvantage of image materials based on polyvinyl alcohol is that few diazo compounds are soluble in water.
I have designed a photosensitive composition in which the polyvinyl alcohol is replaced with a compound capable of overcoming or at least reducing the above disadvantages.
Identification of a suitable compound was, however, complicated by the fact that it should desirably possess all the following properties: a) good compatibility with the diazo compounds used, i.e.
it must not degrade them or be degraded by them until
it is exposed to light; b) good compatibility with the dye used; c) curability in the presence of the photolysis products
of the diazo compounds used in the areas exposed to
light; d) curing under the action of the photolysis products of
the diazo compounds used should be sharply delimited to
only those areas exposed to light; e) the degree of curing achieved by means of the
photolysis products of the diazo compounds used should
be directly proportional to the intensity of light to
which the area has been exposed; f) solubility in water, optionally additionally containing
an anionic surfactant, so that it may be removed from
the areas unexposed to light during the development
stage; g) solubility in solvents more volatile than water so that
industrial production of the image material is rapid,
accurate and low in cost.
It has surprisingly now been found that all these properties are possessed by a maleic acid copolymer of the formula:
where
R is hydrogen or low molecular weight alkoxy residues and n is an integer between 100 and 300.
In fact, in respect of property (g), the compound of the formula (I) has the major advantage of being soluble in volatile organic solvents and allows the production of negative image materials in which the thickness of the photosensitive layer is appreciably lower than that of known polyvinyl alcohol negative image materials.
Accordingly, the invention provides a negative material comprising a substrate covered with a layer of a photosensitive composition, said composition comprising:
at least one diazo compound sensitive to light of a wavelength between approximately 180 and approximately 550 nm,
at least one dye which absorbs no more than 20% of the light to which the above-mentioned diazo compound is sensitive, and
a high molecular weight organic compound which, in the areas exposed to light, may be cured by the photolysis products of the said diazo compound and which, in the areas unexposed to light, may also be removed by water,
characterised in that the high molecular weight organic compound is a maleic acid copolymer of the formula:
where
R is hydrogen or low molecular weight alkoxy residues and n is an integer between 100 and 300.
The maleic acide copolymer of suitable molecular weight may be obtained by heating in water a maleic anhydride copolymer resin such as that sold under the trade name
GANTREZ ANll9 and produced by GAF resins, until the resin is totally dispersed.
The negative material may be a colour proofing sheet for preparing pre-press proofs or a keying film.
The invention also provides a photosensitive composition suitable for the preparation of a coloured negative image material which comprises:
at least one diazo compound sensitive to light of a wavelength between approximately 180 and approximately 550 nm,
at least one dye which absorbs no more than 20% of the light to which the above-mentioned diazo compound is sensitive, and
a high molecular weight organic compound which, in the areas exposed to light, may be cured by the photolysis products of the said diazo compound and which, in the areas unexposed to light, may also be removed by water, characterised in that the high molecular weight organic compound is a maleic acid copolymer of the formula:
where
R is hydrogen or low molecular weight alkoxy residues and n is an integer between 100 and 300.
The present invention also provides a process for the preparation of a coloured negative material characterised in that
- a solution in water and volatile organic solvents is
prepared from a maleic acid copolymer of the formula:
where
R is hydrogen or low molecular weight alkoxy
residues and
n is an integer between 100 and 300,
and from a diazo compound sensitive to light of a
wavelength between approximately 180 and approximately
550 nm, and from at least one dye which absorbs no more
than 20% of the light to which the above-mentioned
diazo compound is sensitive;
- said solution is applied to a substrate; and
- the water and organic solvents are evaporated.
The substrate preferably comprises a thin, transparent, flexible, colourless and dimensionally stable film.
Expressed as an average molecular weight, the compound of the formula (I) preferably has a molecular weight of between approximately 20,000 and 25,000.
An anionic surfactant, such as DOWFAXw from Dow
Chemical Company or the triethanolamine salt of dodecylbenzene-sulphonic acid, may optionally be added to the developing water.
Examples of suitable customary diazo compounds are those of the formula: where
x is 0, s, SO2, NH, CH=CH or CONH;
R1 and R2 which are the same or different, are hydrogen, low
molecular weight alkyl or low molecular weight
alkoxyl;
A is halogen, C104, NO3, BF4, PF6 or CH3S03; and n is an integer between 1 and 6.
A further discussion of such materials may be found in "Light-Sensitive Systems", J. Kosar, John Wiley 1965.
Examples of suitable dyes are: Crystal Blue 21,843 and
Red 19,670 (trade marks of W.S. Simpson, UK); Blue Duasyne
R, B and FBL and Monastral Blue BX-HD and Red RX-HD (trade marks of Hoechst); Blue Disulfine VN150, Nacarat Blue A-CE,
Blue Patent conc. A-CE (trade marks of ICI); Rosa Bengala
Etasol BF (trade mark of Colori Beghe); Pigmosol Rosso 381,
Carminio 443, Scarlatto 361 and 430, Blue 690 and 647, Green 872 and 978, Blue RR, Basonyl Blau 636 and Rot 482 (trade marks of BASF); Diammina Rosso 4BS Extra and 8B Extra,
Diammina Violetto Brillante B and Diammina Blue BBS Extra conc. (trade marks of Hoechst-Cassella); BASF Blue dye, BASF 105 Yellow dye and BASF 411 Black dye.
Examples of suitable supports are polyesters, in particular polyethylene terephthalate (MYLARw (DuPont), MELINEXw (ICI) and TERPHANEw (Rhne-Poulenc)).
The support preferably consists of a film of polyethylene terephthalate which is dimensionally stable at temperatures between -50 and +600C, of 50-250 micron thickness (dependent on the intended use) and substantially transparent to radiation of a wavelength between approximately 180 and approximately 550 nm.
Examples of suitable volatile organic solvents are low molecular weight aliphatic ethers, low molecular weight aliphatic alcohols, low molecular weight aliphatic ketones and low molecular weight aliphatic amides. Typical examples of suitable volatile solvents according to the present invention are methyl alcohol, acetone, formamide and ethylene glycol monomethyl ether.
Before application of the coloured photosensitive composition, the support may receive a customary chemical or physical treatment such as corona discharge treatment to promote the adhesion of the photosensitive layer.
The photosensitive and coloured composition is applied to the support film using customary techniques such as, on an industrial scale, an air knife or the meniscus technique or, on a small scale, a coating wire or the meniscus technique. Further known techniques include the Meyer bar, a gravure roller, a cascade, a curtain, a knife and the
Kershaw loop.
The water and the organic solvents are preferably evaporated at 35-45 C for 3-5 minutes, so achieving substantial energy savings in comparison with the production of negative image materials based on polyvinyl alcohol.
Another major advantage provided by the present invention is that the dry weight of the coloured photosensitive layer is 3-20 times lower than that of negative image materials prepared with compositions based on polyvinyl alcohol. In fact, these latter compositions yield a dry photosensitive layer weighing 3-4 g/m2, while the dry photosensitive layer according to the present invention may typically weigh between 0.2 and 1.5 g/m2. This thus results in considerable raw materials savings, greater transparency of the coloured layer and improved photographic reproduction of the finest details.
The following examples are intended to illustrate the present invention, without however limiting the invention.
ExamPle 1
A sheet or a roll of polyester, preferably between 50100 microns thick, and optically clear, was treated to
Corona discharge, to improve adhesion properties of the photosensitive composition.
The main resin (a maleic anhydride copolymer sold under the trade name GANTREZ AN119 and made by GAF resins) was added to hot water and maintained at about 100 C for about 2hrs until totally dispersed at a concentration of 16%.
240cc of the resin solution was then added to 320cc of methyl glycol (propylene glycol) which acts as a coating solvent and 20cc of Methyl-Flourad combination surface wetting agent, which is produced by 3M. To this was added 3.8 of BASF Blue dye, 0.2g of BASF 105 Yellow dye and 0.2g of BASF 411 Black dye. Meanwhile, 3.5g of diazo "PF6" powder was dissolved in 60cc of dimethyl formamide and mixed with the other ingredients, together with 450cc of isopropyl alcohol and 80cc of acetone which act as flash solvents.
This composition was then roller coated onto the polyester sheet at a speed of between 1.3 metres per minute to give a coating weight of about 1.5g per square metre and then dried by infra-red.
The aforementioned roll of polyester was then converted into sheet sizes (determined by the market) and interleaved, boxed ready for use.
A sheet of the polyester, coated with the above stated photo-composition was then exposed emulsion to emulsion with a process negative.
The sheet of the polyester and the negative were removed from the ultra-violet light source and separated.
The sheet of coloured polyester had a latent image on it and was developed out using only tap water. During development, this image can be rubbed extremely hard endorsing the fact that the same quality can be achieved whosoever developed the images. The developed image was then dried by suitable means such as warm air or infra-red drying to form a colour proof sheet. The process was repeated with other suitably coloured proof sheets which are then overlaid to make up the pre-press proof.
ExamPle 2
1 part by weight of an approximately 30% aqueous solution of a copolymer of methyl vinyl ether and maleic acid with an average molecular weight of approximately 20,000 (prepared by heating a commercial copolymer of methyl vinyl ether and maleic anhydride in the presence of water) was mixed with 1.45 parts by weight of ethylene glycol monomethyl ether (EGME). The solution so obtained was stirred at room temperature while the following were added, 1.75 parts by weight of a 1.50% (wt./wt.) solution of
Basonyl Blau 636 (BASF) dye in EGME, 0.5 parts by weight of a 6.8% (wt./wt.) solution of diazo hexafluorophosphate PF6 or diazo tetrafluoroborate BF4 (P.J.S., UK) in dimethylformamide, 2.7 parts by weight of methyl alcohol and 2.1 parts by weight of acetone.
The mixture so obtained was applied, using the meniscus technique, to a polyethylene terephthalate film (TERPHANE ) of 175 Am in thickness and was dried in a stream of hot air (400C) for 4 minutes.
The dry weight of the photosensitive layer so obtained is 0.8 g/m2 and its percentage composition is: - copolymer: 83.4% - dye: 7.2% - diazo compound: 9.4%
A red negative image material was prepared in a similar manner by replacing Basonyl Blau 636 with Basonyl Rot 482 (BASF).
Similar results were obtained by replacing the copolymer of methyl vinyl ether and maleic acid with a copolymer of ethylene and maleic acid with an average molecular weight of approximately 25,000 (prepared by heating a commercial copolymer of ethylene and maleic anhydride in the presence of water).
Claims (23)
1. Negative material comprising
a substrate covered with a layer of a photosensitive composition, said composition comprising
at least one diazo compound sensitive to light of a wavelength between approximately 180 and approximately 550nm,
at least one dye which absorbs no more than 20% of the light to which the above-mentioned diazo compound is sensitive, and
a high molecular weight organic compound which, in the areas exposed to light, may be cured by the photolysis products of the said diazo compound and which, in the areas unexposed to light, may also be removed by water, characterised in that the high molecular weight organic compound is a maleic acid copolymer of the formula:
where
R is hydrogen or low molecular weight alkoxy
residues and
n is an integer between 100 and 300.
2. Negative material according to claim 1, wherein said substrate comprises a thin, transparent, flexible, colourless and dimensionally stable film.
3. Negative material according to claim 1 or 2, characterised in that the compound of the formula (I) has an average molecular weight of between approximately 20,000 and 25,000.
4. Negative material according to any preceding claim, characterised in that the compound of the formula (I) is a copolymer of methyl vinyl ether and maleic acid or a copolymer of ethylene and maleic acid.
5. Negative material according to any preceding claim, characterised in that the photosensitive diazo compound is diazo hexafluorophosphate PF6 or diazo tetrafluoroborate BF4.
6. Negative material according to any preceding claim, characterised in that the dye is Basonyl Blau 636 or Basonyl
Rot 482.
7. Negative material according to any preceding claim, characterised in that the support consists of a polyethylene terephthalate film.
8. Negative material according to any preceding claim, characterised in that an anionic surfactant is added to the developing water.
9. Photosensitive composition suitable for the preparation of a coloured negative material which comprises at least one diazo compound sensitive to light of a wavelength between approximately 180 and approximately 550 nm, at least one dye which absorbs no more than 20% of the light to which the above-mentioned diazo compound is sensitive and a high molecular weight organic compound which, in the areas exposed to light, may be cured by the photolysis products of the said diazo compound and which, in the areas unexposed to light, may also be removed by water, characterised in that the high molecular weight organic compound is a maleic acid copolymer of the formula:
where
R is hydrogen or low molecular weight alkoxy
residues and
n is an integer between 100 and 300.
10. Composition according to claim 9, characterised in that the compound of the formula (I) has an average molecular weight of between approximately 20,000 and 25,000.
11. Composition according to claim 9 or 10, characterised in that the compound of the formula (I) is a copolymer of methyl vinyl ether and maleic acid or a copolymer of ethylene and maleic acid.
12. Composition according to any of claims 9 to 11, characterised in that the photosensitive diazo compound is diazo fluoroborate F6.
13. Composition according to one or more of claims 9 to 12, characterised in that the dye is Basonyl Blau 636 or Basonyl
Rot 482.
14. Process for the preparation of a coloured negative material characterised in that
- a solution in water and volatile organic solvents is
prepared from a maleic acid copolymer of the formula:
where
R is hydrogen or low molecular weight alkoxy
residues and
n is an integer between 100 and 300,
and from a diazo compound sensitive to light of a
wavelength between approximately 180 and approximately
550nm and from at least one dye which absorbs no more
than 20% of the light to which the above-mentioned
diazo compound is sensitive;
- the said suspension is applied to a thin, transparent,
flexible, colour and dimensionally stable film; and
- the water and organic solvents are evaporated.
15. A process according to claim 14, wherein said substrate comprises a thin, transparent, flexible, colourless and dimensionally stable film substrate; and
16. Process according to claims 14 or 15, characterised in that the compound of the formula (I) has an average molecular weight of between approximately 20,000 and 25,000.
17. Process according to any of claims 14 to 16, characterised in that the compound of the formula (I) is a copolymer of methyl vinyl ether and maleic acid or a copolymer of ethylene and maleic acid.
18. Process according to any of claims 14 to 17, characterised in that the photosensitive diazo compound is diazo fluoroborate F6.
19. Process according to any of claims 14 to 18, characterised in that the dye is Basonyl Blau 636 or Basonyl
Rot 482.
20. Process according to any of claims 14 to 19, characterised in that the support consists of a polyethylene terephthalate film.
21. Process according to any of claims 14 to 20, characterised in that the volatile organic solvent is selected from low molecular weight aliphatic ethers, low molecular weight aliphatic alcohols, low molecular weight aliphatic ketones and low molecular weight aliphatic amides.
22. Process according to claim 21, characterised in that the volatile organic solvent is methyl alcohol, acetone, formamide and ethylene glycol monomethyl ether.
23. A colour proof sheet comprising a negative material according to any of claims 1 to 8.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB939308859A GB9308859D0 (en) | 1993-04-29 | 1993-04-29 | Water-developable coloured photosensitive composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9408535D0 GB9408535D0 (en) | 1994-06-22 |
| GB2277601A true GB2277601A (en) | 1994-11-02 |
Family
ID=10734671
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB939308859A Pending GB9308859D0 (en) | 1993-04-29 | 1993-04-29 | Water-developable coloured photosensitive composition |
| GB9408535A Withdrawn GB2277601A (en) | 1993-04-29 | 1994-04-29 | Photosensitive negative material and composition therefor |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB939308859A Pending GB9308859D0 (en) | 1993-04-29 | 1993-04-29 | Water-developable coloured photosensitive composition |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB9308859D0 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1001312A1 (en) * | 1998-11-11 | 2000-05-17 | Agfa-Gevaert AG | Radiation sensitive recording material for the production of dry offset printing plates |
| US6265136B1 (en) | 1997-01-17 | 2001-07-24 | Kodak Polychrome Graphics Llc | Lithographic plate precursor |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB861871A (en) * | 1956-12-17 | 1961-03-01 | Monsanto Chemicals | Photosensitive materials and processing thereof |
| GB1488864A (en) * | 1974-01-25 | 1977-10-12 | Coates Brothers & Co | Photosensitive composition |
| GB1590125A (en) * | 1976-11-08 | 1981-05-28 | Coates Brothers & Co | Diazo resin containing photosesitive elements |
| US4294905A (en) * | 1978-06-16 | 1981-10-13 | Fuji Photo Film Co., Ltd. | Light-sensitive lithographic printing plate and compositions therefore with multiple resins |
-
1993
- 1993-04-29 GB GB939308859A patent/GB9308859D0/en active Pending
-
1994
- 1994-04-29 GB GB9408535A patent/GB2277601A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB861871A (en) * | 1956-12-17 | 1961-03-01 | Monsanto Chemicals | Photosensitive materials and processing thereof |
| GB1488864A (en) * | 1974-01-25 | 1977-10-12 | Coates Brothers & Co | Photosensitive composition |
| GB1590125A (en) * | 1976-11-08 | 1981-05-28 | Coates Brothers & Co | Diazo resin containing photosesitive elements |
| US4294905A (en) * | 1978-06-16 | 1981-10-13 | Fuji Photo Film Co., Ltd. | Light-sensitive lithographic printing plate and compositions therefore with multiple resins |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6265136B1 (en) | 1997-01-17 | 2001-07-24 | Kodak Polychrome Graphics Llc | Lithographic plate precursor |
| EP1001312A1 (en) * | 1998-11-11 | 2000-05-17 | Agfa-Gevaert AG | Radiation sensitive recording material for the production of dry offset printing plates |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9408535D0 (en) | 1994-06-22 |
| GB9308859D0 (en) | 1993-06-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |