US2062273A - Method for removing colloids from lithographic printing surfaces - Google Patents

Method for removing colloids from lithographic printing surfaces Download PDF

Info

Publication number
US2062273A
US2062273A US700115A US70011533A US2062273A US 2062273 A US2062273 A US 2062273A US 700115 A US700115 A US 700115A US 70011533 A US70011533 A US 70011533A US 2062273 A US2062273 A US 2062273A
Authority
US
United States
Prior art keywords
alkaline earth
hydroxide
lithographic printing
lithographic
printing surfaces
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
US700115A
Inventor
Robert F Reed
Paul W Dorst
George Anthony
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.)
LITHOGRAPHIC TECHNICAL FOND IN
LITHOGRAPHIC TECHNICAL FONDATION Inc
Original Assignee
LITHOGRAPHIC TECHNICAL FOND IN
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 LITHOGRAPHIC TECHNICAL FOND IN filed Critical LITHOGRAPHIC TECHNICAL FOND IN
Priority to US700115A priority Critical patent/US2062273A/en
Application granted granted Critical
Publication of US2062273A publication Critical patent/US2062273A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • 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
    • G03F7/26—Processing photosensitive materials; Apparatus therefor
    • G03F7/42—Stripping or agents therefor
    • G03F7/422—Stripping or agents therefor using liquids only
    • G03F7/425—Stripping or agents therefor using liquids only containing mineral alkaline compounds; containing organic basic compounds, e.g. quaternary ammonium compounds; containing heterocyclic basic compounds containing nitrogen

Definitions

  • This invention relates to a process for removing light-hardened bichromated colloid coatings and the like from lithographic plates.
  • the stencil consists, either wholly or in part, of light-hardened bichromated colloid,
  • the design on the plate or stone must be treated with an ink, varnish or lacquer to form a ground capable 30 of receiving ink during the printing operation, which must be resistant to the caustic alkali used for removal of the resist.
  • Inks containing fatty oils are unsuitable for this ground as they are attacked and removed from the design areas by the caustic alkalies.
  • Tinctures containing asphaltum, certain synthetic resins, or pyroxylin, which are relatively alkaliresistant, are necessary but these possess the disadvantage that the plate, after treatment with caustic alkali, often 40 fails to accept ink, or accepts ink only with dif- Removal of the etching resist or stencil with an acid possesses the following disadvantages:
  • Inks containing fatty ofls and pigments are 50 easily penetrated by dilute mineral acids which then attack the metal or stone underneath.
  • etching resists composed of or containing lighthardened bichromated glue may be removed by solutions containing an alkaline earth hydroxide, a salt of an alkaline earth, or a mixture of an alkaline earth hydroxide and a salt of an alkaline earth.
  • solutions possess the following advantages over alkali metal hydroxides.
  • lithographic printing surface refers to all surfaces used in lithographic printing with the exception of metals such as aluminum which are easily attacked by alkalies.
  • Examples 2 and 4 show how a composition covered by this application may be prepared by forming the alkaline earth hydroxide in solution by the action of an alkali metal hydroxide on a salt of an alkaline earth chloride.
  • Barium chloride grams 8 Sodium hydroxide gram 1 'Water to make r 100 5.
  • Barium hydroxide grams 2 Water to make cc 100 the existence of a chemical equilibrium does not I interfere with the proper working of the solution.
  • Alkaline earth an-.- 1.0 to 15 grams 100 cc. While alkaline earth chlorides are referred to in the examples other alkaline earth salts may be employed with equally good results.
  • a new method of removing bichromated colloid films containing glue from lithographic printing surfaces comprising, treating the lithographic surfaces with a solution of an alkaline earth hydroxide in water.
  • a new method of removing bichromated colloid films containing glue from lithographic printing surfaces comprising, treating the lithographic surfaces with a solution of an alkaline earth hydroxide and a salt of an alkaline earth in water.
  • a new method of removing bichromated colloid films containing glue from lithographic printing surfaces comprising, treating the lithographic surfaces with an aqueous solution containing an alkaline earth chloride and an alkaline earth hydroxide.
  • a new method of removing bichromated colloid films containing glue from lithographic printing surfaces comprising, treating the lithographic surfaces with a solution of an alkaline earth hydroxide in water, the concentration of the hydroxide being from 0.1 gram per 100 cc. to saturation.
  • a new method of removing bichromated colloid films containing glue from lithographic printing surfaces comprising, treating the lithographic surfaces with a solution of an alkaline earth hydroxide and a salt of an alkaline earth in water, the concentration of the alkaline earth hydroxide being from 0.1 gram per 100 cc. to saturation, and the concentration of the alkaline earth salt being from 1.0 to 15 grams per 100 cc.
  • the method of removing bichromated colloid films from lithographic. printing surfaces which comprises, treating the surfaces with an aqueous solution containing a material selected from the group consisting of an alkaline earth hydroxide, salts of alkaline earth, and mixtures of alkaline earth hydroxide and alkaline earth salts.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Description

. Patented Nov. 24, 1936 METHOD FOR REMOVING COLLOIDS FROM LITHOGRAPHIC PRINTING SURFACES Robert F. Reed, Paul W. Dorst, and Anthony George, Cincinnati, Ohio, assignors to The Lithographic Technical Foundation, Inc., New York, N. Y., a corporation of Delaware No Drawing. Application November 28, 1933,
I Serial No. 700,115
6 Claims.
This invention relates to a process for removing light-hardened bichromated colloid coatings and the like from lithographic plates.
In all processes for preparing reversed or deepetched (intaglio) lithographic plates it is necessary to produce a resist or stencil to protect the non-printing areas while the design areas are being etched. This resist or stencil must be removed before the plate is ready to print.
Usually the stencil consists, either wholly or in part, of light-hardened bichromated colloid,
means of alkali metal hydroxides possesses th following disadvantages:
1. These alkalies are extremely active and even 5 dilute solutions cause irritation or corrosion of the skin of operators.
2. Before removal of the resist, the design on the plate or stone must be treated with an ink, varnish or lacquer to form a ground capable 30 of receiving ink during the printing operation, which must be resistant to the caustic alkali used for removal of the resist. Inks containing fatty oils are unsuitable for this ground as they are attacked and removed from the design areas by the caustic alkalies. Tinctures containing asphaltum, certain synthetic resins, or pyroxylin, which are relatively alkaliresistant, are necessary but these possess the disadvantage that the plate, after treatment with caustic alkali, often 40 fails to accept ink, or accepts ink only with dif- Removal of the etching resist or stencil with an acid possesses the following disadvantages:
1. Dilute mineral acids rapidly attack the n grain of the lithographic surface in the nonprinting areas and damage it by reducing its tooth or water-carrying capacity in proportion to their activity and duration of contact.
2. Inks containing fatty ofls and pigments are 50 easily penetrated by dilute mineral acids which then attack the metal or stone underneath.
Grounds prepared with asphaltum, pyroxylin or synthetic resin tinctures, which are satisfactory acid resists, often give trouble by failing to ac- 55 cept ink.
As an improvement in the process of preparing reversed or deep-etched plates we have found that etching resists composed of or containing lighthardened bichromated glue may be removed by solutions containing an alkaline earth hydroxide, a salt of an alkaline earth, or a mixture of an alkaline earth hydroxide and a salt of an alkaline earth.- Such solutions possess the following advantages over alkali metal hydroxides.
'1. They are not as corrosive to the skin of oper ators as solutions of alkali metal hydroxides.
2. They do not attack and remove from the design areas a ground prepared with inks composed of fatty oils and pigments. It is to be understood that the term lithographic printing surface as used herein refers to all surfaces used in lithographic printing with the exception of metals such as aluminum which are easily attacked by alkalies.
Examples of solutions suitable for removal of lighthardened bichromated glue resist or resists containing glue in admixture with another colloid or colloids:
Examples 2 and 4 show how a composition covered by this application may be prepared by forming the alkaline earth hydroxide in solution by the action of an alkali metal hydroxide on a salt of an alkaline earth chloride. The presence of some alkali metal chloride and hydroxide due to 1. Calcium chloride grams 5 Calcium hydroxide do 2 Water to make cc 100 2. Calcium chlorides grams 8 Sodium hydroxide gram 1 Water to make cc 100 3. Barium chloride grams 5 "Barium hydroxide do 2 Water to make 00 100 4. Barium chloride grams 8 Sodium hydroxide gram 1 'Water to make r 100 5. Barium hydroxide grams 2 Water to make cc 100 the existence of a chemical equilibrium does not I interfere with the proper working of the solution.
The limits of concentration found to be most eifective are as follows: Alkaline earth hydroxide 0.1gram/100 cc.
to saturation Alkaline earth an-.- 1.0 to 15 grams 100 cc. While alkaline earth chlorides are referred to in the examples other alkaline earth salts may be employed with equally good results.
Having described our invention, we desire to be limited only by the following claims:
1. A new method of removing bichromated colloid films containing glue from lithographic printing surfaces, said method, comprising, treating the lithographic surfaces with a solution of an alkaline earth hydroxide in water.
2. A new method of removing bichromated colloid films containing glue from lithographic printing surfaces, said method, comprising, treating the lithographic surfaces with a solution of an alkaline earth hydroxide and a salt of an alkaline earth in water.
3. A new method of removing bichromated colloid films containing glue from lithographic printing surfaces, said method, comprising, treating the lithographic surfaces with an aqueous solution containing an alkaline earth chloride and an alkaline earth hydroxide.
4. A new method of removing bichromated colloid films containing glue from lithographic printing surfaces, said method, comprising, treating the lithographic surfaces with a solution of an alkaline earth hydroxide in water, the concentration of the hydroxide being from 0.1 gram per 100 cc. to saturation.
5. A new method of removing bichromated colloid films containing glue from lithographic printing surfaces, said method, comprising, treating the lithographic surfaces with a solution of an alkaline earth hydroxide and a salt of an alkaline earth in water, the concentration of the alkaline earth hydroxide being from 0.1 gram per 100 cc. to saturation, and the concentration of the alkaline earth salt being from 1.0 to 15 grams per 100 cc.
6. The method of removing bichromated colloid films from lithographic. printing surfaces which comprises, treating the surfaces with an aqueous solution containing a material selected from the group consisting of an alkaline earth hydroxide, salts of alkaline earth, and mixtures of alkaline earth hydroxide and alkaline earth salts.
ROBERT F. REED. PAUL W. DORST. ANTHONY GEORGE.
US700115A 1933-11-28 1933-11-28 Method for removing colloids from lithographic printing surfaces Expired - Lifetime US2062273A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US700115A US2062273A (en) 1933-11-28 1933-11-28 Method for removing colloids from lithographic printing surfaces

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US700115A US2062273A (en) 1933-11-28 1933-11-28 Method for removing colloids from lithographic printing surfaces

Publications (1)

Publication Number Publication Date
US2062273A true US2062273A (en) 1936-11-24

Family

ID=24812246

Family Applications (1)

Application Number Title Priority Date Filing Date
US700115A Expired - Lifetime US2062273A (en) 1933-11-28 1933-11-28 Method for removing colloids from lithographic printing surfaces

Country Status (1)

Country Link
US (1) US2062273A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2472304A (en) * 1944-03-13 1949-06-07 Aluminum Co Of America Method of etching aluminum
US2931778A (en) * 1954-09-28 1960-04-05 Diamond Alkali Co Alkaline composition
US3201241A (en) * 1960-07-29 1965-08-17 Azoplate Corp Developer for diazo-type printing plates and the use thereof
US4379830A (en) * 1981-10-06 1983-04-12 Polychrome Corporation Developer for positive photolithographic articles
US5688336A (en) * 1988-05-03 1997-11-18 Millard, Jr.; James B. Method for removal of water soluble polymers

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2472304A (en) * 1944-03-13 1949-06-07 Aluminum Co Of America Method of etching aluminum
US2931778A (en) * 1954-09-28 1960-04-05 Diamond Alkali Co Alkaline composition
US3201241A (en) * 1960-07-29 1965-08-17 Azoplate Corp Developer for diazo-type printing plates and the use thereof
US4379830A (en) * 1981-10-06 1983-04-12 Polychrome Corporation Developer for positive photolithographic articles
US5688336A (en) * 1988-05-03 1997-11-18 Millard, Jr.; James B. Method for removal of water soluble polymers

Similar Documents

Publication Publication Date Title
US2922715A (en) Presensitized printing plate and method for preparing same
US2344510A (en) Planographic plate
US2062273A (en) Method for removing colloids from lithographic printing surfaces
US2203849A (en) Printing plate
US2186945A (en) Preparing lithographic plates for printing
EP0012956B1 (en) Process for the production of lithographic printing plates
US2256449A (en) Method of removing images from planographic plates
US2119031A (en) Planographic printing plate
US2210923A (en) Process of graining intaglio and gravure printing plates
US2003268A (en) Method of etching planographic plates, composition therefor, and resulting product
GB430111A (en) Improvements in compositions for treating planographic printing plates
EP0071823A2 (en) Developing solution for positive-acting radiation-sensitive reproduction layers
US2732796A (en) Printing plates
US3060848A (en) Lithographic plate cleaner and regreaser
GB225015A (en) Improvements in the production of printing surfaces
US2515536A (en) Planographic repellent solution and method of preparing the same
US2016517A (en) Method of preparing printing surfaces
US2333221A (en) Etching solution for lithographic plates
US597366A (en) Otto gael strecker
US3340195A (en) Process of etching
US3281293A (en) Method of etching aluminum
US2265829A (en) Development of lithographic plates
DE733671C (en) Process for coring metallic planographic printing plates
US2192482A (en) Lithographing process
US2645578A (en) Lithograph-plate preparation