US3158476A - Process for the improvement of fixed electrophotographic printing plates which are water-conductive in the image-free parts - Google Patents
Process for the improvement of fixed electrophotographic printing plates which are water-conductive in the image-free parts Download PDFInfo
- Publication number
- US3158476A US3158476A US152141A US15214161A US3158476A US 3158476 A US3158476 A US 3158476A US 152141 A US152141 A US 152141A US 15214161 A US15214161 A US 15214161A US 3158476 A US3158476 A US 3158476A
- Authority
- US
- United States
- Prior art keywords
- image
- lacquer
- plate
- areas
- water
- 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
Links
- 238000000034 method Methods 0.000 title claims description 29
- 238000007639 printing Methods 0.000 title claims description 29
- 239000004922 lacquer Substances 0.000 claims description 29
- 239000003960 organic solvent Substances 0.000 claims description 11
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000000843 powder Substances 0.000 description 12
- 239000010410 layer Substances 0.000 description 11
- 229920005989 resin Polymers 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 239000011888 foil Substances 0.000 description 7
- XLLIQLLCWZCATF-UHFFFAOYSA-N 2-methoxyethyl acetate Chemical compound COCCOC(C)=O XLLIQLLCWZCATF-UHFFFAOYSA-N 0.000 description 6
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 6
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 5
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 5
- 229920000084 Gum arabic Polymers 0.000 description 4
- 241000978776 Senegalia senegal Species 0.000 description 4
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 4
- 239000000205 acacia gum Substances 0.000 description 4
- 235000010489 acacia gum Nutrition 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- MWPLVEDNUUSJAV-UHFFFAOYSA-N anthracene Chemical compound C1=CC=CC2=CC3=CC=CC=C3C=C21 MWPLVEDNUUSJAV-UHFFFAOYSA-N 0.000 description 4
- -1 maleic acid Chemical class 0.000 description 4
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 3
- 229940072049 amyl acetate Drugs 0.000 description 3
- PGMYKACGEOXYJE-UHFFFAOYSA-N anhydrous amyl acetate Natural products CCCCCOC(C)=O PGMYKACGEOXYJE-UHFFFAOYSA-N 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- MNWFXJYAOYHMED-UHFFFAOYSA-M heptanoate Chemical compound CCCCCCC([O-])=O MNWFXJYAOYHMED-UHFFFAOYSA-M 0.000 description 3
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 3
- 239000011976 maleic acid Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000007645 offset printing Methods 0.000 description 3
- 239000005011 phenolic resin Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000000783 alginic acid Substances 0.000 description 2
- 235000010443 alginic acid Nutrition 0.000 description 2
- 229920000615 alginic acid Polymers 0.000 description 2
- 229960001126 alginic acid Drugs 0.000 description 2
- 150000004781 alginic acids Chemical class 0.000 description 2
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000003755 preservative agent Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- CXWXQJXEFPUFDZ-UHFFFAOYSA-N tetralin Chemical compound C1=CC=C2CCCCC2=C1 CXWXQJXEFPUFDZ-UHFFFAOYSA-N 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- PTTPXKJBFFKCEK-UHFFFAOYSA-N 2-Methyl-4-heptanone Chemical compound CC(C)CC(=O)CC(C)C PTTPXKJBFFKCEK-UHFFFAOYSA-N 0.000 description 1
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- RHLVCLIPMVJYKS-UHFFFAOYSA-N 3-octanone Chemical compound CCCCCC(=O)CC RHLVCLIPMVJYKS-UHFFFAOYSA-N 0.000 description 1
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- YYLLIJHXUHJATK-UHFFFAOYSA-N Cyclohexyl acetate Chemical compound CC(=O)OC1CCCCC1 YYLLIJHXUHJATK-UHFFFAOYSA-N 0.000 description 1
- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 description 1
- UIHCLUNTQKBZGK-UHFFFAOYSA-N Methyl isobutyl ketone Natural products CCC(C)C(C)=O UIHCLUNTQKBZGK-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- 241000272534 Struthio camelus Species 0.000 description 1
- FHNINJWBTRXEBC-UHFFFAOYSA-N Sudan III Chemical compound OC1=CC=C2C=CC=CC2=C1N=NC(C=C1)=CC=C1N=NC1=CC=CC=C1 FHNINJWBTRXEBC-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 229920000180 alkyd Polymers 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- PYKYMHQGRFAEBM-UHFFFAOYSA-N anthraquinone Natural products CCC(=O)c1c(O)c2C(=O)C3C(C=CC=C3O)C(=O)c2cc1CC(=O)OC PYKYMHQGRFAEBM-UHFFFAOYSA-N 0.000 description 1
- 150000004056 anthraquinones Chemical class 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000004126 brilliant black BN Substances 0.000 description 1
- 235000012709 brilliant black BN Nutrition 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 150000003997 cyclic ketones Chemical class 0.000 description 1
- 125000002243 cyclohexanonyl group Chemical group *C1(*)C(=O)C(*)(*)C(*)(*)C(*)(*)C1(*)* 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 125000000664 diazo group Chemical group [N-]=[N+]=[*] 0.000 description 1
- 238000010410 dusting Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- RCHKEJKUUXXBSM-UHFFFAOYSA-N n-benzyl-2-(3-formylindol-1-yl)acetamide Chemical compound C12=CC=CC=C2C(C=O)=CN1CC(=O)NCC1=CC=CC=C1 RCHKEJKUUXXBSM-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229920003986 novolac Polymers 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-N o-dicarboxybenzene Natural products OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 150000003022 phthalic acids Chemical class 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 230000011514 reflex Effects 0.000 description 1
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical compound [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-UHFFFAOYSA-N 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000011877 solvent mixture Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- GMMAPXRGRVJYJY-UHFFFAOYSA-J tetrasodium 4-acetamido-5-hydroxy-6-[[7-sulfonato-4-[(4-sulfonatophenyl)diazenyl]naphthalen-1-yl]diazenyl]naphthalene-1,7-disulfonate Chemical compound [Na+].[Na+].[Na+].[Na+].OC1=C2C(NC(=O)C)=CC=C(S([O-])(=O)=O)C2=CC(S([O-])(=O)=O)=C1N=NC(C1=CC(=CC=C11)S([O-])(=O)=O)=CC=C1N=NC1=CC=C(S([O-])(=O)=O)C=C1 GMMAPXRGRVJYJY-UHFFFAOYSA-J 0.000 description 1
- LLWJPGAKXJBKKA-UHFFFAOYSA-N victoria blue B Chemical compound [Cl-].C1=CC(N(C)C)=CC=C1C(C=1C=CC(=CC=1)N(C)C)=C(C=C1)C2=CC=CC=C2C1=[NH+]C1=CC=CC=C1 LLWJPGAKXJBKKA-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- Printing plates which are produced by the electrophotographic process are prepared as follows: lithographic supports that are either naturally hydrophilic or are provided with a hydrophilic covering, e.g., supports made of aluminum or zinc or paper, are provided with a photo-.
- this electrophotographic material is electrically charged and then exposed by the Contact process via a photographic master or by the reflex process in a document camera.
- the resultant latent electrostatic image is made visible by dusting over with a resin powder and then fixed, e.g., by heating, so that the resin powder is irremovably anchored to the support.
- the printing plate is prepared from the resultant electrocopies by treatment With an organic solvent or with an alkaline, neutral or acid aqueous solution.
- the photoconductive coating is thereby removed from the image-free parts and, after the parts that have been bared have, where necessar, been rendered hydrophilic, the image parts are inked up with greasy ink and printing can them be performed.
- planographic printing plates by the electrophotograpbic method has also been described, as follows.
- the image made visible with electroscopic powder-a powder image is transferred to a lithographic support and the transferred powder is then fixed to the support by heating.
- foils or plates made of aluminum or zinc are coated with a thin layer of anthracene or anthraquinone and then charged, exposed imagewise and developed. The plate is then carefully heated to temperatures at which the developer powder melts and the anthracene volatilizes.
- a process which also serves for the electrophotographic production of lithographic plates consists of the following steps.
- the electrostatic image is then developed and fixed and this image is converted into a printing plate by a process which renders the image-free regions of the surface of the support hygroscopic.
- the support is first coated with a hygroscopic substance which, in turn, is coated witha photoconductor layer. When the image has been produced, the photoconductor layer is removed in the image-free parts with a solvent and the hydrophilic coating on the supporting material is bared.
- the present invention relates to a process by which fixed printing plates which have been electrophotographically produced and are hydrophilic on the non-printing 3,!58Aifi Patented Nov. 24, 1964.-
- the process of the invention consists in coating fixed electrophotographically produced printing plates, that are hydrophilic in the image-free parts, with aqueous colloidal agents known per so as printing plate preservatives and then, after the coating has dried, treating the plates with lacquers which contain organic solvents.
- aqueous colloidal agents known per so as printing plate preservatives
- lacquers which contain organic solvents.
- an oleophilic lacquer consisting of a lacquer base and organic solvents is used for the treatment.
- the fixed powder image is dissolved away in the image areas and the lacquer base combines firmly with the image support, e.g., the supporting metal foil.
- a layer is formed that is only a few thousandths of a millimeter in thickness, thus fulfilling the conditions of planographic printing.
- the lacquer protects against mechanical abrasion and enables long runs to be obtained.
- a lithographic metal foil coated with an electrophotographic substance is electrostatically charged and exposed image-wise; the latent image thereon is developed with an electroscopic powder and fixed.
- the foil is then converted into a printing plate by a process in which the coating is removed or rendered hydrophilic in the imagefree parts.
- the entire image side of the printing foil is then wiped over with an agent commonly used as a printing plate preservative, e.g., a dilute aqueous solution of gum arabic, carboxymethyl cellulose or alginic acid.
- an agent commonly used as a printing plate preservative e.g., a dilute aqueous solution of gum arabic, carboxymethyl cellulose or alginic acid.
- an appropriate quantity of a suitable lacquer is poured thereon and distributed over the whole surface by means of a cotton pad, sponge or similar material.
- the lacquer dissolves away the fixed electrophotographic powder image (relief image) andcombines firmly with the metal support, but does not adhere to the gummed, image-free parts.
- the lacquered printing plate is then dried in the air or in a hot air current or in a drying cupboard and afterwards sprayed down vigorously with Water.
- the lacquer thereupon flakes olf in the imagefree parts but adheres in the image parts so that an appropriately colored image appears on the printing plate. This can be used for printing in an offset machine.
- the lacquer used may consist of various commercially available solutions. Such lacquers are used for the lacquering of lithographic plates that have, for example, been presensitized with light-sensitive diazo solutions or which are coated immediately before use with a lightsensitive chromium-rubber layer or a chromium polyvinyl alcohol layer. It was not known hitherto that electrophotographically prepared printing plates could be converted into true planographic printing plates with these lacquers; lacquers of this type contain a synthetic resin as the lacquer base.
- suitable ones are: polymers or interpolymers of vinyl chloride, vinyl acetate, and styrene, with or without the addition of unsaturated acids such as maleic acid, as also alkyl resins, phenol resins, epoxide resins, phthalic acid ester resins, and the like.
- organic solvents are: water-insoluble aliphatic ketones such as methyl isobutyl ketone, di-isobutyl ketone, ethyl amyl ketone or cyclic ketones such as cyclohexanone or esters of aliphatic acids with aliphatic alcohols such as amyl acetate, butyl acetate, methyl glycol acetate, cyclohexyl acetate or partially hydrogenated aromatic hydrocarbons, such as tetrahydronaphthalene.
- water-insoluble aliphatic ketones such as methyl isobutyl ketone, di-isobutyl ketone, ethyl amyl ketone or cyclic ketones such as cyclohexanone or esters of aliphatic acids with aliphatic alcohols such as amyl acetate, butyl acetate, methyl glycol acetate, cyclohexyl acetate or partially hydrogenated aromatic
- a dyestufl dissolved in the solution colors the image parts.
- Usual dyestuffs are those such as Victoria Blue B (Schultz, Farbstofitabellen, 7th edition, vol. I, p. 347, No. 822), Sudan Black BN (Schultz, Farbstofftabellen, 7th edition, supplementary, volume II, p. 261), Oil Red A (Schultz, Farbstoiftabellen, 7th edition, vol. I, page 365, No. 864), Rhodamine B extra (Schultz, Farbstofftabellen,
- Plasticizers may be added to the lacquer and these improve film-forming properties.
- Phthalic acid esters are, for example, suitable.
- Example I An aluminum foil coated with a photoconductive layer, e.g. such as described in Belgian Patent 588,660, is electrostatically charged and exposed under a master.
- the latent electrostatic image thus produced is developed by means of an electroscopic powder and the powder image is then fixed by heating for a period of irom 20 to 40 seconds to a temperature of 180 C.
- the foil is converted into a printing plate by removing the photoconductive layer in the image-free areas, thus baring the aluminum support. Now the whole image side of the printing plate is wiped over with a 16 percent aqueous solution of gum arabic, Which deposits firmly in the image free, metallic areas only.
- the interpolymer used contains 85 percent by weight of vinyl chloride, 14 percent by weight of vinyl acetate, and 1 percent by weight of maleic acid. It is dissolved in the solvent mixture with agitation and the dyestufi is then added. For Reinblau see: Schultz Farbstotftabellen, 7th edition, vol. I, No. 816.
- the lacquer is distributed in sweeping movements over the printing plate.
- the lacquer dis solves the fixed powder and the photoconductive layer beneath, and combines firmly with the metallic support, thus replacing the image by an identical image consisting of a very thin lacquer layer, but does not adhere to the imagefree, gummed areas.
- the printing plate is vigorously rinsed with water.
- gum arabic and lacquer are peeled from the image-free areas in large flakes, while the lacquer adheres firmly to the image areas, so that a blue image becomes visible on the printing plate. It may be used for making long runs in an offset printing machine.
- Example 11 The procedure described in Example I is followed, but the lacquer used consists of the following ingredients:
- the novolak resin used is a pure, non-hardenable d phenol resin of a melting range of from 108 to 118 C.
- Fettrot A see: Schultz Farbstofftabellen, 7th edition, vol. 1, No. 864.
- a process for improving an electrophotographic printing plate having, on a support, a fixed image formed by developing a latent electrostatic image with an electroscopic material, the plate being hydrophilic in the imagefree areas which comprises coating the plate with an aqueous coloidal agent, which colloidal agent adheres to the non-image areas, drying, treating the plate with a lacquer containing an organic solvent, whereby only the image areas are removed and the said lacquer adheres to the said support in the image areas, and treating the plate with water whereby the coating is removed only in the non-image areas.
- aqueous colloidal agent is selected from the group consisting of gum arabic, carboxymethyl cellulose, and alginic acid.
- the lacquer includes a synthetic resin selected from the group con sisting of a polymer of vinyl chloride; a copolymer of vinyl chloride, vinyl acetate and styrene; a copolymer of vinyl chloride, vinyl acetate, styrene, and maleic acid; a phenolic resin; an aldehyde resin; an epoxy resin; and an alkyd resin.
Landscapes
- Printing Plates And Materials Therefor (AREA)
- Photoreceptors In Electrophotography (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEK0042632 | 1961-01-13 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3158476A true US3158476A (en) | 1964-11-24 |
Family
ID=7222822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US152141A Expired - Lifetime US3158476A (en) | 1961-01-13 | 1961-11-14 | Process for the improvement of fixed electrophotographic printing plates which are water-conductive in the image-free parts |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3158476A (en(2012)) |
| BE (1) | BE612479A (en(2012)) |
| CH (1) | CH393921A (en(2012)) |
| FR (1) | FR1309800A (en(2012)) |
| GB (1) | GB981410A (en(2012)) |
| NL (1) | NL273143A (en(2012)) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3459128A (en) * | 1965-11-09 | 1969-08-05 | Kalle Ag | Emulsion lacquer containing alkyl/phenol resin for the after-treatment of developed planographic printing plates |
| US4388391A (en) * | 1980-02-15 | 1983-06-14 | Hoechst Aktiengesellschaft | Process for the manufacture of a lithographic printing form by electrophotography |
| US4748098A (en) * | 1986-05-21 | 1988-05-31 | Hoechst Aktiengesellschaft | Emulsion for post-treating planographic printing plates prepared by electrophotographic means and process for producing the printing plates |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2754279A (en) * | 1951-08-01 | 1956-07-10 | Minnesota Mining & Mfg | Aqueous composition of an unmodified hydroxyl-containing resinous glycidyl polyether of a dihydric phenol |
| US2865873A (en) * | 1957-02-06 | 1958-12-23 | Litho Chemical And Supply Co I | Lacquer emulsion for lithographic plates |
| US3019106A (en) * | 1959-06-30 | 1962-01-30 | Algraphy Ltd | Processing of pre-sensitised lithographic printing plates |
| US3121009A (en) * | 1960-03-16 | 1964-02-11 | Rca Corp | Preparation of etched plates |
-
0
- NL NL273143D patent/NL273143A/xx unknown
- BE BE612479D patent/BE612479A/xx unknown
-
1961
- 1961-11-14 US US152141A patent/US3158476A/en not_active Expired - Lifetime
-
1962
- 1962-01-04 GB GB410/62A patent/GB981410A/en not_active Expired
- 1962-01-10 FR FR884391A patent/FR1309800A/fr not_active Expired
- 1962-01-12 CH CH34462A patent/CH393921A/de unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2754279A (en) * | 1951-08-01 | 1956-07-10 | Minnesota Mining & Mfg | Aqueous composition of an unmodified hydroxyl-containing resinous glycidyl polyether of a dihydric phenol |
| US2865873A (en) * | 1957-02-06 | 1958-12-23 | Litho Chemical And Supply Co I | Lacquer emulsion for lithographic plates |
| US3019106A (en) * | 1959-06-30 | 1962-01-30 | Algraphy Ltd | Processing of pre-sensitised lithographic printing plates |
| US3121009A (en) * | 1960-03-16 | 1964-02-11 | Rca Corp | Preparation of etched plates |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3459128A (en) * | 1965-11-09 | 1969-08-05 | Kalle Ag | Emulsion lacquer containing alkyl/phenol resin for the after-treatment of developed planographic printing plates |
| US4388391A (en) * | 1980-02-15 | 1983-06-14 | Hoechst Aktiengesellschaft | Process for the manufacture of a lithographic printing form by electrophotography |
| EP0034317B1 (de) * | 1980-02-15 | 1983-11-16 | Hoechst Aktiengesellschaft | Verfahren zur Herstellung einer Flachdruckform auf elektrophotographischem Wege |
| US4748098A (en) * | 1986-05-21 | 1988-05-31 | Hoechst Aktiengesellschaft | Emulsion for post-treating planographic printing plates prepared by electrophotographic means and process for producing the printing plates |
Also Published As
| Publication number | Publication date |
|---|---|
| CH393921A (de) | 1965-06-15 |
| FR1309800A (fr) | 1962-11-16 |
| NL273143A (en(2012)) | |
| GB981410A (en) | 1965-01-27 |
| BE612479A (en(2012)) |
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