US2941466A - Planographic printing platess - Google Patents

Planographic printing platess Download PDF

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Publication number
US2941466A
US2941466A US605963A US60596356A US2941466A US 2941466 A US2941466 A US 2941466A US 605963 A US605963 A US 605963A US 60596356 A US60596356 A US 60596356A US 2941466 A US2941466 A US 2941466A
Authority
US
United States
Prior art keywords
coating
insolubilized
salts
planographic printing
amount
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
Application number
US605963A
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English (en)
Inventor
Douglas A Newman
Allan T Schlotzhauer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Columbia Ribbon and Carbon Manufacturing Co Inc
Original Assignee
Columbia Ribbon and Carbon Manufacturing Co Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to GB945042D priority Critical patent/GB945042A/en
Application filed by Columbia Ribbon and Carbon Manufacturing Co Inc filed Critical Columbia Ribbon and Carbon Manufacturing Co Inc
Priority to US605963A priority patent/US2941466A/en
Priority to DEC21380A priority patent/DE1200848B/de
Application granted granted Critical
Publication of US2941466A publication Critical patent/US2941466A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41C1/1091—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme by physical transfer from a donor sheet having an uniform coating of lithographic material using thermal means as provided by a thermal head or a laser; by mechanical pressure, e.g. from a typewriter by electrical recording ribbon therefor
    • 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
    • B41N3/03—Chemical or electrical pretreatment
    • B41N3/036—Chemical or electrical pretreatment characterised by the presence of a polymeric hydrophilic coating

Definitions

  • This invention relates to planographic printing and especially to planographic printing plates formed by a coating on a flexible fibrous foundation such as paper.
  • coating compositions including as a film-forming ingredient a hydrophilic binder of the class of carboxymethyl cellulose compounds or compounds of other polysaccharide carboxy ethers, have the hydroph-ilicoleophilic balance to give particularly good printing results.
  • Such coatings are rendered effective as printing surfaces when the film former is insolubilized, either by a reagent included in the coating mixture, or after-applied to the dried coating.
  • the coatings employed on coated paper planographic printing plates usually include one or more of various fillers to improve their printing and especially their image-retentive properties.
  • the fillers sometimes used for this purpose are china clay, barium sulphate, hydrated alumina, calcium carbonate, zinc oxide, titanium dioxide, fiuorspar, fullers earth and other similar materials.
  • the present invention it has been discovered that, in coatings of polysaccharide carboxy ether compounds insolubilized with the salts and compounds heretofore mentioned, the presence in particular of an oxide of zinc, titanium, magnesium or calcium, or mixtures of these particular oxides, in the composition in contrast to the other materials currently used as fillers, in some manner not altogether understood at present, has a pronounced inhibiting effect on the tendency of the coatings to become sensitive with age. It is found that, regardless of storage conditions of heat and humidity, the plates which include, as a significant portion of the filler, one or more of the oxides named will be uniformly usable and capable of producing copies of acceptable grade after a period of aging.
  • the present invention is characterized by the presence of an aging sensitization inhibitor in the form 2,4i',466 Patented June 21, 196Q of material selected from the group consisting of the oxides of zinc, titanium, magnesium and calcium and mixtures thereof, as a significant portion of the filler in coat ings of the polysaccharide carboxy ether type, insolubilized by salts or compounds of copper, aluminum, iron and chromium, and especially compounds of chromium.
  • an aging sensitization inhibitor in the form 2,4i',466 Patented June 21, 196Q of material selected from the group consisting of the oxides of zinc, titanium, magnesium and calcium and mixtures thereof, as a significant portion of the filler in coat ings of the polysaccharide carboxy ether type, insolubilized by salts or compounds of copper, aluminum, iron and chromium, and especially compounds of chromium.
  • a flexible paper foundation sheet is preferably treated in a known manner with wet strength-imparting ingredients such as melamine formaldehyde, although this may be dispensed with in the preparation of plates for certain short-run purposes.
  • wet strength-imparting ingredients such as melamine formaldehyde
  • known surface sizings or water-barrier coat-ings may be applied which provide for improved operation under long-run conditions.
  • an aqueous suspension or slurry is prepared containing between one and five percent of a film-forming constituent such as carboxymethyl cellulose,
  • the suspension includes a filler which may be about two tofour times the weight of the binder present.
  • this filler has often consisted entirely of china clay or the like, but according to the present invention, at least a certain percent of the filler is composed of an aging sensitization inhibitor in the form of an oxide of zinc, titanium, magnesium or calcium, or a mixture of two or more of these materials.
  • Other ingredients may be included to aid, for example, in the coating operation, or for other special purposes, but the ingredients enumerated are the essentials.
  • the slurry is applied to the paper, for example by a brush coating operation, and allowed to dry.
  • One example of a coating suspension for this purpose is:
  • Formula I Ingredients: 7 Parts by weight 5% aqueous dispersion of sodium carboxymethyl cellulose China clay 15 Zinc oxide 5 Glycerine- -n 3
  • the coated surface of the sheet is treated, as by tub sizing, with an aqueous solution of one or more of the metal salts or com pounds heretofore mentioned.
  • a mixture of chlorides or sulfates of aluminum, ferric iron and copper, together with chromium trioxide are employed as disclosed in the patent to Douglas A. Newman, No. 2,655,864.
  • the preferred formula as shown in said patent is as follows:
  • the slurry of Formula'III is applied tothe paper web, as by brush coating, and allowedto a pma asl the application of'heat, to give a coating is water insoluble and provides a planographic printingsurface ofgood quality.
  • the plates thus constituted may be aged for extended periods, even under adverse conditions ofrhigh temperature and humidity, and may then he successfully imaged and used to print copies of goodquality Q'Ifhe tendency heretofore experienced for the reaction product of insolubilization treating materials such as copper, aluminum or iron salts or chromium compoundsjwith film formers of the polysaccharide carboxy'ether type to become increasingly ink sensitive with prolonged aging, presumably due to sustained subjection to heat and humidity, is found to be effectively inhibitedby the prescnce of the special oxide filler which acts to maintain the originally manufactured vand normally aged condition of the plate surface, free from. unusual ink sensitivity, regardless of the duration and temperature-humidity conditions of storage which the plate may encounter.
  • the proportion of the special oxidefiller which should be included may vary, but it has been found that the use of amounts equivalent to about thirty percent of the weight of the film former present will produce clearly noticeable etfects for the purpose. In most cases it appears that no particular advantage accrues from including amounts in excess of the weight of film forming material although more maybe used if desired without substantial detriment.
  • a planographic printing plate comprising a fibrous flexible foundation web; a'p'rinting surface 'coating 'on said'webconsisting essentially of an insoluble ⁇ hydrophilic polysaccharide carboxy ether 'film- Iorriiing niaterial insolubilized by reaction with a metal compound selectedfrom the group consisting of coppensaltgiron salts, aluminum salts and chromium compounds which thus reacted has a hydrophilic-oleophilic balance suitable for direct -irnaging use, and which is subje :to becoming excessively ink-sensitive upon subsequent exposure to protracted conditions of abnormal heat and humidity, said coating including an amount of zinc oxide 'suflicient to act as an aging sensitization inhibitor for said insolubilized film former, said amount being equivalent to at least about thirty percent of the weight of'said forming material.
  • a planographic printing plate comprising a fibrous flexible foundation web; a printing surface coatin gon said Web consisting essentially of an insoluble'hydro philic polysaccharide carboxy ether film formin'g material insolubilized by reaction with metal'conipounds consisting of copper, iron and aluminum saltsfand 'a chromium compound and which thus reactedjha sl a hydrophilic-oleophilic balance suitable for direct-imaging use, and which is subject to becoming excessively ink-sensitive upon subsequent exposure to protracted conditions f abnormal heat and humidity, said coating including a quantity of inert filler and a sufiicient amount ofjzinc oxideto act as an aging sensitization inhibitor for said insolubili z ed film former, said amount being equivalenbto at least about thirty percent of the weight of said film forming material.
  • a planographic printing plate comprising a fibrous flexible foundation web; a printing surface coating on said web vconsisting essentially of an insoluble hydrophilictpolysaccharide carboxy ether film torming materi al insolubilized by reaction with m etal compounds consisting of copper, iron and aluminum'salts; and ;a chromium oxide compound and which when-thus reacted has a hydrophilic-oleophilic balance suitable for direct-imaging use, and which is subject to becoming.
  • said coating including a filler which is an aging s'ensitization inhibitor, said inhibitor being zinc oxide present in ,an amount equal to at least about thirty percent -oflthe weight-of said'film forming material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Optics & Photonics (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)
US605963A 1956-08-24 1956-08-24 Planographic printing platess Expired - Lifetime US2941466A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB945042D GB945042A (enrdf_load_stackoverflow) 1956-08-24
US605963A US2941466A (en) 1956-08-24 1956-08-24 Planographic printing platess
DEC21380A DE1200848B (de) 1956-08-24 1960-05-05 Lithographische Flachdruckfolie

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US605963A US2941466A (en) 1956-08-24 1956-08-24 Planographic printing platess

Publications (1)

Publication Number Publication Date
US2941466A true US2941466A (en) 1960-06-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
US605963A Expired - Lifetime US2941466A (en) 1956-08-24 1956-08-24 Planographic printing platess

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US (1) US2941466A (enrdf_load_stackoverflow)
GB (1) GB945042A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3220346A (en) * 1962-06-20 1965-11-30 Millen Ind Inc Planographic printing plate
US3663289A (en) * 1970-04-06 1972-05-16 Columbia Ribbon & Carbon Process of producing a planographic printing plate and resultant article
WO1999044838A1 (en) * 1998-03-06 1999-09-10 Kodak Polychrome Graphics Company Ltd. Printing
EP0997317A1 (en) * 1998-10-26 2000-05-03 Agfa-Gevaert N.V. A lithographic base for use in non-impact printing
US6295927B1 (en) 1998-10-26 2001-10-02 Agfa-Gevaert Lithographic base for use in non-impact printing

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2542784A (en) * 1945-09-21 1951-02-20 Addressograph Multigraph Planographic printing plate and method of preparing the same
US2598189A (en) * 1944-03-27 1952-05-27 Dick Co Ab Photographic printing plate
US2635537A (en) * 1950-07-19 1953-04-21 Warren S D Co Paper planographic printing plate with stabilized hydrophilic coating
US2655864A (en) * 1945-12-22 1953-10-20 Columbia Ribbon & Carbon Method of making planographic plates
US2693145A (en) * 1948-03-09 1954-11-02 Dick Co Ab Lithographic printing plate and method of making
US2778301A (en) * 1953-05-22 1957-01-22 Warren S D Co Coated paper planographic printing plate

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2598189A (en) * 1944-03-27 1952-05-27 Dick Co Ab Photographic printing plate
US2542784A (en) * 1945-09-21 1951-02-20 Addressograph Multigraph Planographic printing plate and method of preparing the same
US2655864A (en) * 1945-12-22 1953-10-20 Columbia Ribbon & Carbon Method of making planographic plates
US2693145A (en) * 1948-03-09 1954-11-02 Dick Co Ab Lithographic printing plate and method of making
US2635537A (en) * 1950-07-19 1953-04-21 Warren S D Co Paper planographic printing plate with stabilized hydrophilic coating
US2778301A (en) * 1953-05-22 1957-01-22 Warren S D Co Coated paper planographic printing plate

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3220346A (en) * 1962-06-20 1965-11-30 Millen Ind Inc Planographic printing plate
US3663289A (en) * 1970-04-06 1972-05-16 Columbia Ribbon & Carbon Process of producing a planographic printing plate and resultant article
WO1999044838A1 (en) * 1998-03-06 1999-09-10 Kodak Polychrome Graphics Company Ltd. Printing
US6579599B1 (en) 1998-03-06 2003-06-17 Kodak Polychrome Graphics Llc Printing
EP0997317A1 (en) * 1998-10-26 2000-05-03 Agfa-Gevaert N.V. A lithographic base for use in non-impact printing
US6295927B1 (en) 1998-10-26 2001-10-02 Agfa-Gevaert Lithographic base for use in non-impact printing

Also Published As

Publication number Publication date
GB945042A (enrdf_load_stackoverflow)

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