GB1122449A - Improvements in coated compositions for planographic printing plates - Google Patents

Improvements in coated compositions for planographic printing plates

Info

Publication number
GB1122449A
GB1122449A GB4147866A GB4147866A GB1122449A GB 1122449 A GB1122449 A GB 1122449A GB 4147866 A GB4147866 A GB 4147866A GB 4147866 A GB4147866 A GB 4147866A GB 1122449 A GB1122449 A GB 1122449A
Authority
GB
United Kingdom
Prior art keywords
xanthate
clay
flour
starch
pigment
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
Application number
GB4147866A
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.)
Oxford Paper Co
Original Assignee
Oxford Paper Co
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
Application filed by Oxford Paper Co filed Critical Oxford Paper Co
Publication of GB1122449A publication Critical patent/GB1122449A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/10—Forme preparation for lithographic printing; Master sheets for transferring a lithographic image to the forme
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Optics & Photonics (AREA)
  • Manufacturing & Machinery (AREA)
  • Printing Plates And Materials Therefor (AREA)

Abstract

1,122,449. Planographic printing plates. OXFORD PAPER CO. 16 Sept., 1966 ]30 Sept., 1965], No. 41478/66. Heading B6C. Planographic printing plates comprising a base and a coating of a pigment and a waterinsoluble polyvalent metal xanthate of an hydroxy-containing natural polymer are made by coating the base with an aqueous composition of the pigment and a xanthate of an hydroxycontaining natural polymer, drying the coating composition and then treating it with a salt of a polyvalent metal. The various xanthates are preferably prepared by treating the natural polymer, e.g. starch or flour, with potassium hydroxide and carbon disulphide to form a potassium starch or flour xanthate which is then dried and dissolved in distilled water. The pigment preferably includes at least 50% by weight of clay, e.g. kaolin, china clay or Lustra Clay; other pigments may be used, especially colloidal silica. The starch or flour xanthate is added to the clay slip while stirring, and butyl alcohol is also preferably incorporated in the coating composition. Preferred polyvalent metals are zinc and iron; examples of salts used include zinc acetate, ferric chloride, copper sulphate and lead acetate.
GB4147866A 1965-09-30 1966-09-16 Improvements in coated compositions for planographic printing plates Expired GB1122449A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US49186965A 1965-09-30 1965-09-30

Publications (1)

Publication Number Publication Date
GB1122449A true GB1122449A (en) 1968-08-07

Family

ID=23953999

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4147866A Expired GB1122449A (en) 1965-09-30 1966-09-16 Improvements in coated compositions for planographic printing plates

Country Status (2)

Country Link
DE (2) DE6608678U (en)
GB (1) GB1122449A (en)

Also Published As

Publication number Publication date
DE6608678U (en) 1971-10-21
DE1571911A1 (en) 1971-02-25

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