US3617266A - Process for preparing a planographic printing form - Google Patents

Process for preparing a planographic printing form Download PDF

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Publication number
US3617266A
US3617266A US710723A US3617266DA US3617266A US 3617266 A US3617266 A US 3617266A US 710723 A US710723 A US 710723A US 3617266D A US3617266D A US 3617266DA US 3617266 A US3617266 A US 3617266A
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United States
Prior art keywords
planographic printing
preparing
printing plate
plate according
polymeric compound
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Expired - Lifetime
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US710723A
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English (en)
Inventor
Jozef Frans Willems
Jozef Leonard Van Engeland
Noel Jozef De Volder
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Agfa Gevaert NV
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Agfa Gevaert NV
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Publication of US3617266A publication Critical patent/US3617266A/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G13/00—Electrographic processes using a charge pattern
    • G03G13/26—Electrographic processes using a charge pattern for the production of printing plates for non-xerographic printing processes
    • G03G13/28—Planographic printing plates

Definitions

  • a planographic printing plate prepared by electrostatic exposure and development and carrying a hydrophobic deposit from such development in the image areas thereof is hydrophilized by treatment with an aqueous solution containing a polymeric compound having in the recurring units thereof an amino salt and/or quaternary salt group the polymer compound being free of long chain hydrocarbon groups.
  • Preferred hydrophilizing compounds are polyamines having aliphatic linkages between the amino groups and polyvinyl compounds having hydrogen-containing heterocyclic side groups.
  • PROCESS FOR PREPARING A PLANOGRAPHIC PRINTING FORM This invention relates to a process for preparing planographic printing plate and to the printing plate obtained therewith.
  • Planographic printing is based on the physical property of repellcnce of greasy materials for water.
  • the printing surface which is substantially flat, contains the pattern of the image to be printed in terms of a differentiation in water repellency.
  • ln 1 the ordinary lithographic or planographic printing processes a printing plate is prepared by afi'ixing to a water-attractive, hydrophilic surface, a water repellent, hydrophobic image,
  • the electrostatic image is rendered visible by applying a developer powder; which is held electrostatically to the charged areas of the sheet.
  • the powder image preferably composed of hydrophobic fusible powder particles may be fixed by heating.
  • the difference in hydrophobicity between the developed image parts and the noncovered areas of the recording layer is not high enough for high quality planographic printing and has to be increased. Therefor it has been. proposed to treat the recording layer chemically in the undeveloped areas in order to make said areas highly water- I receptive.
  • a photoconductive insulating recording layer comprising an electrically insulating binder having suspended therein an inorganic photoconductive substance that can provide zinc ions, such as photoconductive zinc oxide, can be provided with improved hydrophility by treating it with a polyamino compound comprising at least two nonaromatic amino groups, e.g. aliphatic, cycloaliphatic, cycloor heterocyclic amino groups without aromatic character, at least one of these amino groups being present in salt form or quatemized form.
  • a polyamino compound comprising at least two nonaromatic amino groups, e.g. aliphatic, cycloaliphatic, cycloor heterocyclic amino groups without aromatic character, at least one of these amino groups being present in salt form or quatemized form.
  • the aliphatic or cycloaliphatic chains of the nonaromatic amine groups may consist entirely of chains of carbon atoms, or the chains may contain carbon atoms interspaced with oxygen, sulfur nitrogen or phosphorus atoms or combinations thereof.
  • the chains may contain ester, amide, ether, imidazole, or urethane linkages, or their thio-equivalents.
  • Use is preferably made of a polymeric compound containing one or more aliphatic amino groups in the recurring units e.g. a polyalkyleneimine compound wherein part of the amino groups or all of them are transformed into a salt form or a quatemized form.
  • a polymeric compound containing one or more aliphatic amino groups in the recurring units e.g. a polyalkyleneimine compound wherein part of the amino groups or all of them are transformed into a salt form or a quatemized form.
  • R is a C,-C,,alltyl group
  • m is an integer from 2 to 50.
  • n is at least 2.
  • the polyamino compounds for use according to the present invention are preferably dissolved in an aqueous liquid in a concentration of 0.1 to 20 percent by weight calculated on the total weight ofthe liquid.
  • polyamino compounds comprising amino group(s) in neutralized or quaternized form are preferably used in com bination with water-soluble ferricyanides and/or water-soluble ferrocyanides since the sparingly water-soluble hydrophilic zinc salts formed therewith have a relatively high adsorption power for cationic compounds and therefore have a mordanting efi'ect on said neutralized or quaternized polyamino compounds.
  • a printing plate containing in the hydrophilized portions a coprecipitate of zinc ferriand/or zinc ferrocyanide and a neutralized or quaternized polyamine has a high resistance to wear, which is important for long run printing. That resistance to wear can still be increased with hydrophilic colloids which may be applied simultaneously with or after the treatment with said polyamines.
  • Suitable hydrophilic colloids for that purpose are e.g. gum arabic, alginic acid, water-soluble alginates e.g. ammonium alginate, caseinates, gelatin, polyacrylic acid esters, polystyrene sulfonic acid, polyvinyl alcohol, and 5 carboxymethylcellulose.
  • a treatment with hydrophilic precipitating or hardening agents for these colloids has proved to be advantageous. So, use can be made of formaldehyde as protein hardener and heavy metal salts forming a precipitate e.g. with alginates.
  • the pH of the hydrophilizing liquid is preferably below 7 and more preferably within the range of 3 to 6.
  • water-soluble mineral and/or organic acids can be used e.g. orthophosphoric acid, nitric acid, sulfuric acid, hydrochloric acid, boric acid, acetic acid, citric acid, tartaric acid, tannic acid and lactic acid.
  • the hydrophilizing action of the hydrophilizing agent may be improved by a pretreatment of the developed and fixed recording layer with a softening or swelling agent for thebinder occasionally in combination with a wetting agent improving the penetrating power of the hydrophilizing agent in the recordin gTayerT In this way much more zinc oxide grains are reached by thehydrophilizing agent and hydrophilized.
  • swelling agents preferably water-miscible compounds such as acetone and methyl ethyl ketone are used.
  • the electrophotographic recording layer is rendered water-receptive at the areas to be hydrophilized after the printing master has been mounted on the press, thus obviating any separate immersion treatment.
  • the hydrophilizing treatment of said layer may be carried out by means of an absorbent pad impregnated with an aqueous solution containing the partly or wholly neutralized or quaternized polyamine.
  • Electrophotographic recording materials which are especially suited to be used in the preparation of a planographic printing plate, are described e.g. in the published Dutch Pat. applications 6,608,814 and 6,608,815.
  • Any known process for forming the electrostatic latent image and hydrophobic image may be applied.
  • the hydrophobic image is formed by the consecutive steps of producing an electrostatic image on a photoconductive zinc oxide/hydrophobic binder layer by integrally electrostatically charging that layer, subsequently image-wise exposing and developing the latter with a hydrophobic developer powder, which is fixed to the recording layer e.g. by heating.
  • the powder image can be formed by the known dry carrier-toner development" or by a liquid development based on electrophoresis wherein charged hydrophobic particles are attracted from an electrically insulating liquid to be charged areas of the recording layer.
  • Such development technique is described eg in the U.K. Pat. specification 755,486.
  • an electrostatic latent image can also be developed by a selective deposit of an aqueous developing composition.
  • That composition can e.g. contain a dispersed hydrophobic polymer, which on drying the liquid image is image-wise left and forms a hydrophobic pattern.
  • polyamines applied according to the present invention can be used in combination with other hydrophilizing compounds.
  • EXAMPLE 1 A layer of photoconductive material consisting of photoconductive zinc oxide dispersed in an insulating binder (3 parts by weight of zinc oxide to 1 part by weight or resin binder) was coated on a sheet of aluminum foil laminated to a paper support.
  • the resin binder contained on a weight basis of styrene-butadiene copolymer (80/20), 20% of silicone resin (Silicone Resin SR-82 supplied by General Electric Silicone Products Department Waterford, N.Y., U.S.A.).
  • the recording layer was charged with a negative corona with a tension of 6000 v. on the corona wires and exposed through a graphic original. Development was carried out by using the magnetic brush technique with iron particles as carrier and gilsonite as fusible toner.
  • the powder image was fixed to the layer by heating for seconds at C.
  • a cotton pad was impregnated with a solution containing the following ingredients:
  • the plate was rubbed softly with the cotton pad while on the press.
  • the quality of prints was very good.
  • EXAMPLE 6 A layer of photoconductive material consisting of photoconductive zinc oxide dispersed in an insulating binder (6 parts by weight of zinc oxide to l part by weight of binder) was coated on a flexible aluminum foil.
  • the binder was prepared from a mixture of EPOK X-l 772 (ammoniacal alkyd resin salt marketed as a 66 to 68 percent (by weight) aqueous solution by British Resin Products Ltd.) and EPOK W-980l (a 72 to 75 percent aqueous solution ofa melamine-formaldehyde resin marketed by British Resin Products).
  • EPOK X-l 772 ammoniacal alkyd resin salt marketed as a 66 to 68 percent (by weight) aqueous solution by British Resin Products Ltd.
  • EPOK W-980l a 72 to 75 percent aqueous solution ofa melamine-formaldehyde resin marketed by British Resin Products
  • the cured recording layer was charged with a negative corona with a tension of 6000 v. on the corona-wires and exposed to a line-copy.
  • the electrostatic image was electrophoretically developed by means of an electrophoretic developer obtained by diluting the hereinafter described concentrated developer composition in a volume ratio of l5/l000 with the hydrocarbon solvent SHELLSOL T (trade name) carbon black (average particle size p.)
  • SHELLSOL T (trade name) 750 cc.
  • the resin binder solution was prepared by heating 500 g. of ALKYDAL L 67 [trade name by Konverkusen, West Germany, for a linseed oil (67. percent by weight) modified alkyd resin] and 500 cc. of white spirit containing l 1 percent by weight of aromatic compounds at 60 C. till a clear solution was obtained, and subsequent cooling.
  • ALKYDAL L 67 trade name by Konverkusen, West Germany
  • SOLIDOGEN FFL (trade name) 5 cc. sodium ferrocyanide l g. sodium sulfite (antioxidant) 2.5 g.
  • Example 7 Example 6 was repeated, with the proviso, however, that the hydrophilizing liquid was acidified till pH 3 by means of tartaric acid, phosphoric acid, citric acid, phytic acid, or oxalic acid.
  • Example I was repeated with the proviso, however, that the hydrophilizing liquid was acidified till pH 6 and that it contained 5 percent by weight of the quaternized polyamino compound No. 6 of the table.
  • the hydrophilization obtained was equivalent to that according to the procedure of example I. Results of slightly inferior quality were obtained by using the compounds Nos. 7, 8 and 9 in the same concentration at pH values of 6, 2 and 6 respectively.
  • a process for preparing a planographic printing plate comprising the steps of forming a latent electrostatic image on a photoconductive insulating recording layer containing an inorganic photoconductive substance, which can provide zinc ions, and developing said image with a toner forming an image-wise hydrophobic deposit on said recording layer, the improvement of treating the portions of the recording layer whichare not covered with said hydrophobic deposit with an aqueous hydrophilizing solution containing a a water-soluble polyamino compound comprising at least two nonaromatic amino groups with each adjacent pair of such amino groups being connected by an aliphatic linkage'including a hydrocarboifchain (fit leis: two but not more than six carbon atoms, said compounds containing not more than six carbon atoms in a continuous carbon chain, at least part of the amino groups in said compound being in amine salt or quaternized salt form.
  • polyamino compound is a. member of the group consisting of:
  • n is an integer from 2 to 50;
  • R is a. C -C alkyl group; and a: is an integer from 2 to 50;
  • n is at least 2;
  • n is at least 2;

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Printing Plates And Materials Therefor (AREA)
US710723A 1967-03-06 1968-03-06 Process for preparing a planographic printing form Expired - Lifetime US3617266A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB00475/67A GB1192602A (en) 1967-03-06 1967-03-06 Process for Preparing a Planographic Printing Plate
GB10477/67A GB1198123A (en) 1967-03-06 1967-03-06 Process for Preparing a Planographic Printing Master
GB10476/67A GB1198122A (en) 1967-03-06 1967-03-06 Process for Preparing a Planographic Printing Form

Publications (1)

Publication Number Publication Date
US3617266A true US3617266A (en) 1971-11-02

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US710723A Expired - Lifetime US3617266A (en) 1967-03-06 1968-03-06 Process for preparing a planographic printing form
US710729A Expired - Lifetime US3573041A (en) 1967-03-06 1968-03-06 Process for preparing a planographic printing plate
US710730A Expired - Lifetime US3592640A (en) 1967-03-06 1968-03-06 Process for preparing a planographic printing master

Family Applications After (2)

Application Number Title Priority Date Filing Date
US710729A Expired - Lifetime US3573041A (en) 1967-03-06 1968-03-06 Process for preparing a planographic printing plate
US710730A Expired - Lifetime US3592640A (en) 1967-03-06 1968-03-06 Process for preparing a planographic printing master

Country Status (7)

Country Link
US (3) US3617266A (enrdf_load_stackoverflow)
BE (1) BE711704A (enrdf_load_stackoverflow)
CH (1) CH500512A (enrdf_load_stackoverflow)
DE (1) DE1622950A1 (enrdf_load_stackoverflow)
FR (1) FR1558045A (enrdf_load_stackoverflow)
GB (3) GB1198122A (enrdf_load_stackoverflow)
NL (1) NL6803164A (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946671A (en) * 1972-09-28 1976-03-30 The Commonwealth Of Australia Electrostatic offset printing
US3948827A (en) * 1973-10-26 1976-04-06 Dai Nippon Printing Company Limited Dry planographic printing ink composition
US3970455A (en) * 1973-06-04 1976-07-20 Itek Corporation Electrostatic lithographic printing process utilizing hydrophilizing composition
US4058470A (en) * 1975-10-24 1977-11-15 A. B. Dick Company Liquid developer composition for lithographic masters
EP0135031A1 (en) * 1983-07-19 1985-03-27 Tomoegawa Paper Co. Ltd. Desensitizing solution for use in offset printing
US5525458A (en) * 1993-09-02 1996-06-11 Tomoegawa Paper Co., Ltd. Desensitizing solution for lithographic platemaking
US5565290A (en) * 1991-07-30 1996-10-15 Fuji Photo Film Co., Ltd. Desensitizing solution for offset printing
US5681686A (en) * 1993-04-20 1997-10-28 Iwatsu Electric Co., Ltd Desensitizing solution for offset printing
JP3222667B2 (ja) 1993-11-16 2001-10-29 株式会社巴川製紙所 平版印刷用不感脂化処理液

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3807305A (en) * 1968-07-15 1974-04-30 Itek Corp Metal photographic plate comprising a silver halide process
US3807304A (en) * 1968-07-15 1974-04-30 Itek Corp Photographic process for producing coherent metallic image bonded to a roughened support and products produced thereby
US4053319A (en) * 1973-06-04 1977-10-11 Itek Corporation Hydrophilizing composition for lithographic printing plates
NL7606078A (nl) * 1975-06-12 1976-12-14 Dow Chemical Co Werkwijze voor het bereiden van een bevochti- gingsoplossing voor lithografische drukken.
US4070969A (en) * 1976-07-16 1978-01-31 Minnesota Mining And Manufacturing Company Method for strengthening lithographic printing plate images
US4043811A (en) * 1976-07-29 1977-08-23 Addressograph Multigraph Corporation Conversion solutions for planographic masters
DE2934897C1 (de) * 1978-02-06 1984-09-20 Napp Systems (USA), Inc., San Marcos, Calif. Desensibilisierungsloesung fuer fotoempfindliche Diazodruckplatten
GB8501868D0 (en) * 1985-01-25 1985-02-27 Byrne P Board game
JPS6277994A (ja) * 1985-10-01 1987-04-10 Nikken Kagaku Kenkyusho:Kk オフセツト印刷用電子写真版の不感脂化処理液
JPH01133795A (ja) * 1987-11-19 1989-05-25 Nikken Kagaku Kenkyusho:Kk オフセツト印刷用電子写真版の不感脂化処理液
JP2622753B2 (ja) * 1988-06-27 1997-06-18 石原産業株式会社 オフセット印刷マスターの作成方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2023669A (en) * 1933-01-06 1935-12-10 Art of printing
US3106158A (en) * 1962-01-22 1963-10-08 Rca Corp Method of preparing lithographic printing plates
US3211686A (en) * 1959-06-18 1965-10-12 Plastic Coating Corp Aqueous composition for prewetting a master carrying an image prepared by electrophotographic reproduction containing polyacrylic acid
US3230081A (en) * 1959-08-04 1966-01-18 Azoplate Corp Process for the preparation of printing plates utilizing electrostatic image formation techniques
US3245784A (en) * 1961-10-16 1966-04-12 Minnesota Mining & Mfg Lithographic master and process of preparation
US3309940A (en) * 1963-11-27 1967-03-21 Int Standard Electric Corp Detention mechanism for rotary switches, particularly stepping switches

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2023669A (en) * 1933-01-06 1935-12-10 Art of printing
US3211686A (en) * 1959-06-18 1965-10-12 Plastic Coating Corp Aqueous composition for prewetting a master carrying an image prepared by electrophotographic reproduction containing polyacrylic acid
US3230081A (en) * 1959-08-04 1966-01-18 Azoplate Corp Process for the preparation of printing plates utilizing electrostatic image formation techniques
US3245784A (en) * 1961-10-16 1966-04-12 Minnesota Mining & Mfg Lithographic master and process of preparation
US3106158A (en) * 1962-01-22 1963-10-08 Rca Corp Method of preparing lithographic printing plates
US3309940A (en) * 1963-11-27 1967-03-21 Int Standard Electric Corp Detention mechanism for rotary switches, particularly stepping switches

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3946671A (en) * 1972-09-28 1976-03-30 The Commonwealth Of Australia Electrostatic offset printing
US3970455A (en) * 1973-06-04 1976-07-20 Itek Corporation Electrostatic lithographic printing process utilizing hydrophilizing composition
US3948827A (en) * 1973-10-26 1976-04-06 Dai Nippon Printing Company Limited Dry planographic printing ink composition
US4058470A (en) * 1975-10-24 1977-11-15 A. B. Dick Company Liquid developer composition for lithographic masters
EP0135031A1 (en) * 1983-07-19 1985-03-27 Tomoegawa Paper Co. Ltd. Desensitizing solution for use in offset printing
US5565290A (en) * 1991-07-30 1996-10-15 Fuji Photo Film Co., Ltd. Desensitizing solution for offset printing
US5681686A (en) * 1993-04-20 1997-10-28 Iwatsu Electric Co., Ltd Desensitizing solution for offset printing
US5525458A (en) * 1993-09-02 1996-06-11 Tomoegawa Paper Co., Ltd. Desensitizing solution for lithographic platemaking
JP3222667B2 (ja) 1993-11-16 2001-10-29 株式会社巴川製紙所 平版印刷用不感脂化処理液

Also Published As

Publication number Publication date
DE1622950A1 (de) 1971-01-14
US3573041A (en) 1971-03-30
CH500512A (de) 1970-12-15
GB1198122A (en) 1970-07-08
FR1558045A (enrdf_load_stackoverflow) 1969-02-21
GB1192602A (en) 1970-05-20
US3592640A (en) 1971-07-13
GB1198123A (en) 1970-07-08
NL6803164A (enrdf_load_stackoverflow) 1968-05-27
BE711704A (enrdf_load_stackoverflow) 1968-09-06

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