US3344741A - Receiving sheet for use as a master or copy in the dtr process - Google Patents

Receiving sheet for use as a master or copy in the dtr process Download PDF

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Publication number
US3344741A
US3344741A US488479A US48847965A US3344741A US 3344741 A US3344741 A US 3344741A US 488479 A US488479 A US 488479A US 48847965 A US48847965 A US 48847965A US 3344741 A US3344741 A US 3344741A
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United States
Prior art keywords
weight
lithographic
coating
receiving sheet
sheet
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Expired - Lifetime
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US488479A
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English (en)
Inventor
Ruth E Ormsbee
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AB Dick Co
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AB Dick Co
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Filing date
Publication date
Application filed by AB Dick Co filed Critical AB Dick Co
Priority to US488479A priority Critical patent/US3344741A/en
Priority to JP41061035A priority patent/JPS5017881B1/ja
Priority to NL6613182A priority patent/NL6613182A/xx
Priority to DK482966A priority patent/DK133068C/da
Priority to GB41899/66A priority patent/GB1131818A/en
Priority to BE687153D priority patent/BE687153A/xx
Priority to DE19661597522 priority patent/DE1597522A1/de
Priority to FR76899A priority patent/FR1526890A/fr
Application granted granted Critical
Publication of US3344741A publication Critical patent/US3344741A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • G03F7/004—Photosensitive materials
    • G03F7/06—Silver salts
    • G03F7/07—Silver salts used for diffusion transfer

Definitions

  • This invention relates to the production of copy by the diffusion transfer reversal process, generally referred to as the DTR process, and it relates more particularly to the preparation of an image receiving sheet which can be used both as a sheet for the production of single copies or as a master from which multiple copies can be produced by lithographic duplication. More specifically, the invention relates to a lithographic master which can be imaged by the DTR process and which can also be used as a single copy sheet.
  • Copy sheets for use in the production of single copy by the DTR process have been avilable for some time; however, such sheets cannot generally be employed as lithographic masters from which multiple copies of good quality can be produced when imaged by DTR technique.
  • the difiiculty in the fabrication of a lithographic master for imaging by diffusion transfer resides in the formulation of a sheet which embodies the characteristics essential for lithographic reproduction, including (1) a sheet having high wet strength and dimensional stability to enable repeated wetting with aqueous repellent and oleophilic ink composition in the production of inked copies therefrom, (2) which embodies a water insoluble, water receptive, ink repellent surface essential to the imaged master, and (*3) which has surface characteristics that provide the critical balance between water receptivity in the non-imaged portions and ink receptivity in the imaged portions whereby the aqueous repellent with which the sheet is first wet will preferentially be received by the non-imaged hydrophilic portions of the imaged master while the precipitated silver image deposited on the surface diffusion transfer from an exposed negative will repel the aqueous repellent and be preferentially wet by the oleophilic ink composition in inking the master for use in the production of copy.
  • a DTR lithographic plate formed of an aluminum base sheet having a surface treated to render the surface hydrophilic and lithographic as by reaction with a water soluble silicate, acrylic acid, or by anodization to form an oxide layer and in which the lithographic surface is provided with a nucleating agent, such as colloidal silver, silver sulfide, cadmium sufide and the like for nucleating the conversion of the soluble silver halide complex difiused from the unexposed portions of the negative to precipitate silver as an ink receptive, water repellent image on the lithographic surface of the aluminum sheet.
  • a nucleating agent such as colloidal silver, silver sulfide, cadmium sufide and the like for nucleating the conversion of the soluble silver halide complex difiused from the unexposed portions of the negative to precipitate silver as an ink receptive, water repellent image on the lithographic surface of the aluminum sheet.
  • DTR plates for lithographic duplication have been formed of coated paper base sheets wherein the paper base sheet is formulated to contain a resinous binder to impart wet strength and which is overcoated with a gelatin coating containing the nucleating agent.
  • Such Wet strength papers are non-lithographic such that the procedure required for preparation of the plate for lithographic duplication has included treatment of the surface of the plate, after the plate has been imaged, with an acid etch composition for conversion of the non-imaged portion of the plate to a hydrophilic, ink repellent, lithographic surface.
  • Such multiple steps for the preparation of an imaged master for lithographic duplication is objectionable, at least from the standpoint of time, labor and materials, and even then a satisfactory plate for the production of a large number of copies of good quality is difficult to achieve.
  • the nucleating agent is incorporated in a gelatin coating applied to the surface of a paper base sheet.
  • Gelatin coatings of the type described are diflicult to apply and they also provide a surface which presents problems during image development by diffusion transfer in that the gelatin coating is adhesive and makes separation of the negative and positive sheets more difiicult and it also retards drying and introduces curl into the master thereby to militate against the production of an imaged plate which lies flat on the plate cylinder of the duplicating machine.
  • FIG. 1 is a perspective view partially in section of a receiving sheet embodying the features of this invention
  • FIG. 2 is a sectional elevational View of the arrangement of elements for imaging the receiving sheet by an exposed negative
  • FIG. 3 is a perspective view partially in section similar to that of FIG. 1 showing the imaged receiving sheet.
  • Acrylic emulsion polymer (46% solids-Rhoplex AC33-Rohm & Hass Co.) g .25
  • the coating composition is applied by roller coating, flow coating or other suitable paper coating process in coating weights of 0.5 to 10.0 pounds per 3000 square feet of surface area, or to a water resistant paper base sheet 10 such as Schoeller water resistant base, or Baryta paper and the like.
  • the coating 12 is air dried or preferably force dried in an air drying oven at a temperature within the range of ISO-300 F.
  • the coated paper After sheeting and punching to provide the openings 14 in the leading edge of the sheet for mounting as a lithographic plate onto a plate cylinder of a lithographic press, the coated paper is ready for use as a receiving sheet.
  • Example 2 subject matter to be reproduced, the exposed negative is brought into surface contact with the coated side of the receiving sheet after the exposed negative or both the negative and the receiving sheet have been wet with a conventional developing solution, as represented by the following developing composition, which is diluted in the ratio of 1 to 1 with tap water before use.
  • a conventional developing solution as represented by the following developing composition, which is diluted in the ratio of 1 to 1 with tap water before use.
  • the nucleating agent present in the surface of the receiving sheet operates to reduce the silver halide complex to colloidal particles of silver or other reduction reaction product which becomes strongly bonded to the coated surface of the sheet and defines an oleophilic, ink receptive, water repellent image 30 on an otherwise ink repellent, water receptive hydrophilic, water insoluble, lithographic surface.
  • the receiving sheet is then separated from the negative sheet. Separation is easy by reason of the absence of gelatin in the coating 12 on the receiving sheet and also by reason of the presence of colloidal silica as an essential and major component of said coating. The separated receiving sheet also appears immediately to dry possibly because of the presence in the coating of colloidal silica.
  • the imaged sheet can be used directly as a single copy or it. can be immediately, or after a period of time, mounted on the plate cylinder of a lithographic press for use in the production of a number of inked copies by conventional lithographic duplicating technique. However, it is preferred to fix the image and condition the plate by treatment of the imaged surface with a conditioner represented by the following:
  • the conditioner is wiped onto the surface of the image receiving sheet, before or after mounting on the press,
  • the formulation of the devel-' oping solution and the conditioner is not critical to the invention in that conventional photographic developers and lithographic conditioners can be employed.
  • An important concept-of this invention resides in the non-gelatin coating applied to the paper base sheet for use in the preparation of the receiving sheet. It is not essential for the polyvinylidene chloride and the acrylic emulsion polymer to be present in the coating composition or for both to be present together in combination with the colloidal silica since either one or the other can be employed or the colloidal silica can be employed alone, as illustrated by the following examples:
  • Example 5 Water 30 Colloidal silica (30% SiO -Ludox LSDu Pont) 30 Sodium sulfide (0.5% solution) 2 Silver nitrate (0.5% solution) 3 Polyvinylidene chloride latex (60% solids) 4 Saponin (10% solution) 4.
  • Example 6 Water l5 Colloidal silica (30% SiO Ludox l-lS-Du Pont) 30 Sodium sulfide (0.5 solution) 2 Silver nitrate (0.5% solution) 3 Acrylic emulsion polymer (46% solids) .5 'Saponin (10% solution) .1
  • Example 7 G Colloidal silica (Ludox LSDu Pont) Silver sulfide (34% solution) 25 Silver nitrate (68% solution) 25
  • the amount and type of nucleating agent can be varied depending upon the formulation of the developer and the composition of the silver halide negative although any conventional nucleating agents can be employed.
  • sodium sulfide and silver nitrate in the preferred practice of this invention, it is preferred to make use of the materials in the ratio of about 1 part by weight of sodium sulfide to 11.5 parts by weight of silver nitrate although it is permissible to make use of the materials within the range which comprises 1 part by weight of the sodium sulfide to 02 parts by weight of silver nitrate.
  • the amount of resinous solids in the coating composition when based upon the SiO content of colloidal silica, can range from 9 parts by weight of Si0 to .255.0 parts by weight of the combined resinous polymers and 9 parts by Weight of SiO to .14 parts by weight of the resinous material when formed of acrylic emulsion polymer, or 9 parts by weight of SiO to 0.5-5.0 parts by weight of resinous binder when formed of polyvinylidene chloride, all on a solids basis.
  • the amount of nucleating agent can be varied over .a fairly wide range depending upon the agent employed but it is preferred to make use of an amount Within the range of .1-.5 part by Weight nucleating agent per 9, parts by weight of SiO
  • the saponin is a surface active agent derived from plant glucosides such as tn'terpenoid saponin but the surface active agent is not essential to the formulation of the coating composition since it serves primarily for the stabilization thereof and other surface active agents can be used.
  • a receiving sheet for imaging by a dilfusion transfer reversal process comprising a paper base sheet and a coating on the surface of the paper base sheet consisting essentially of the combination of colloidal silica, a nucleating agent for reduction of a soluble silver halide complex to an oleophilic ink receptive imaging material and present in an amount within the range of 0.1 to 0.5 part by weight per 9 parts by weight of colloidal silica and in which the nucleating agent comprises the combination of sodium sulfide and silver nitrate present in the ratio of 1 part by weight of sodium sulfide to 1 to 1.5 parts by weight of silver nitrate, and a resinous binder selected from the group consisting of a vinylidene chloride polymer and an acrylate polymer and in which the coating is a water insoluble coating which is water receptive, ink repellent, hydrophilic and lithographic.
  • a receiving sheet as claimed in claim 1 in which the vinylidene chloride polymer is present in the coating in an amount within the range of 0.5 to 5.0 parts by weight to 9 parts by weight of colloidal silica calculated as SiO 3.
  • a receiving sheet for imaging by diffusion transfer reversal process comprising a paper base sheet and a coating on the surface of the paper base sheet consisting essentially of the combination of colloidal silica and a nucleating agent for reduction of soluble silver halide complex to an oleophilic ink receptive imaging material in which the nucleating agent is present in an amount within the range of 0.1 to 0.5 part by Weight per 9 parts by weight of colloidal silica and in which the nucleating agent comprises the combination of sodium sulfide and silver nitrate present in the ratio of 1 part by weight of sodium sulfide to 1 to 1.5 parts 'by weight of silver nitrate and in which the coating is water insoluble, water receptive, ink repellent, hydrophilic and lithographic.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
US488479A 1965-09-20 1965-09-20 Receiving sheet for use as a master or copy in the dtr process Expired - Lifetime US3344741A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US488479A US3344741A (en) 1965-09-20 1965-09-20 Receiving sheet for use as a master or copy in the dtr process
JP41061035A JPS5017881B1 (US07922777-20110412-C00004.png) 1965-09-20 1966-09-16
DK482966A DK133068C (da) 1965-09-20 1966-09-19 Master til brug som litografisk kliche
NL6613182A NL6613182A (US07922777-20110412-C00004.png) 1965-09-20 1966-09-19
GB41899/66A GB1131818A (en) 1965-09-20 1966-09-20 Improvements in or relating to receiving sheets for use in the diffusion transfer reversal process
BE687153D BE687153A (US07922777-20110412-C00004.png) 1965-09-20 1966-09-20
DE19661597522 DE1597522A1 (de) 1965-09-20 1966-09-20 Als Kopie oder lithographische Druckvorlage verwendbares Bildaufnahmeblatt
FR76899A FR1526890A (fr) 1965-09-20 1966-09-20 Feuille réceptrice pouvant être utilisée comme cliché ou comme copie, dans le procédé de reproduction par inversion, transfert et diffusion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US488479A US3344741A (en) 1965-09-20 1965-09-20 Receiving sheet for use as a master or copy in the dtr process

Publications (1)

Publication Number Publication Date
US3344741A true US3344741A (en) 1967-10-03

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Family Applications (1)

Application Number Title Priority Date Filing Date
US488479A Expired - Lifetime US3344741A (en) 1965-09-20 1965-09-20 Receiving sheet for use as a master or copy in the dtr process

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US (1) US3344741A (US07922777-20110412-C00004.png)
JP (1) JPS5017881B1 (US07922777-20110412-C00004.png)
BE (1) BE687153A (US07922777-20110412-C00004.png)
DE (1) DE1597522A1 (US07922777-20110412-C00004.png)
DK (1) DK133068C (US07922777-20110412-C00004.png)
GB (1) GB1131818A (US07922777-20110412-C00004.png)
NL (1) NL6613182A (US07922777-20110412-C00004.png)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3639124A (en) * 1969-12-17 1972-02-01 Polaroid Corp Pretransferred silver deposit receiving element
JPS534603A (en) * 1976-07-01 1978-01-17 Tomoegawa Paper Co Ltd Waterrfree lithographic printing form

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63154139U (US07922777-20110412-C00004.png) * 1987-03-31 1988-10-11

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2698237A (en) * 1954-08-16 1954-12-28 Polaroid Corp Photographic silver halide transfer product and process
US3062648A (en) * 1960-02-09 1962-11-06 Eastman Kodak Co Photographically sensitive lithographic printing plate
US3157117A (en) * 1957-10-31 1964-11-17 Dick Co Ab Lithographic plates and method for manufacture
US3161508A (en) * 1958-08-29 1964-12-15 Eastman Kodak Co Process of lithographic printing
US3220837A (en) * 1955-07-22 1965-11-30 Polaroid Corp Diffusion transfer to stratum of a silver image inked and used in printing
US3247793A (en) * 1963-03-27 1966-04-26 Dick Co Ab Thermographic method for imaging an offset master

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2698237A (en) * 1954-08-16 1954-12-28 Polaroid Corp Photographic silver halide transfer product and process
US3220837A (en) * 1955-07-22 1965-11-30 Polaroid Corp Diffusion transfer to stratum of a silver image inked and used in printing
US3157117A (en) * 1957-10-31 1964-11-17 Dick Co Ab Lithographic plates and method for manufacture
US3161508A (en) * 1958-08-29 1964-12-15 Eastman Kodak Co Process of lithographic printing
US3062648A (en) * 1960-02-09 1962-11-06 Eastman Kodak Co Photographically sensitive lithographic printing plate
US3247793A (en) * 1963-03-27 1966-04-26 Dick Co Ab Thermographic method for imaging an offset master

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3639124A (en) * 1969-12-17 1972-02-01 Polaroid Corp Pretransferred silver deposit receiving element
JPS534603A (en) * 1976-07-01 1978-01-17 Tomoegawa Paper Co Ltd Waterrfree lithographic printing form
JPS573516B2 (US07922777-20110412-C00004.png) * 1976-07-01 1982-01-21

Also Published As

Publication number Publication date
DK133068B (da) 1976-03-15
DE1597522A1 (de) 1970-05-06
GB1131818A (en) 1968-10-30
JPS5017881B1 (US07922777-20110412-C00004.png) 1975-06-25
DK133068C (da) 1976-09-27
NL6613182A (US07922777-20110412-C00004.png) 1967-03-21
BE687153A (US07922777-20110412-C00004.png) 1967-03-01

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