Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
  • B41M5/025—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet
  • B41M5/04—Duplicating or marking methods; Sheet materials for use therein by transferring ink from the master sheet using solvent-soluble dyestuffs on the master sheets, e.g. alcohol-soluble
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
  • G03B15/00—Special procedures for taking photographs; Apparatus therefor
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03D—APPARATUS FOR PROCESSING EXPOSED PHOTOGRAPHIC MATERIALS; ACCESSORIES THEREFOR
  • G03D9/00—Diffusion development apparatus

Definitions

• the present invention relates to the manufacture of a number of hectographic prints from a photographically obtained matrix.
• the paper on which is to be printed and/or the print liquid must contain a means for converting the color coupler into dyestuif very rapidly and at room temperature.
• an oxidizing agent must be present in the paper and/ or in the print liquid.
• multivalent cerium-, vanadium-, manganese compounds, dichromates etc. are of particular importance.
• the layer of the print paper can contain products such as heteropoly acids which increase the light-fastness of the organic dyestutf.
• the print liquid must be used in such a way that either the color coupler in the emulsion or the formed dyestutf be dissolved and can diffuse to 'the print paper.
• An aqueous solution of an acid preferably an organic acid such as oxalic acid, critric acid, tartaric acid etc. is particularly suited as print liquid when leucobases are used.
• Example 3 of said British specification U.S. Serial No. 582,944, filed May 7, 1956
• a gelatin relief containing both a leucobase and an oxidizing agent
• a gelatin relief containing both a leucobase and an oxidizing agent
• Bringing the matrix into contact with the paper can occur in a printing apparatus of the alcohol duplicator type. If in this process an aqueous acid solution is used as print liquid, there is the risk that the construction material of the duplicator is affected. Moreover, the paper moistened with aqueous solution remains easily sticked to the image relief serving as matrix.
• the leucobase can first be converted into a dyestulf after obtaining the 3,252,4l2 Patented May 24, 1965 image relief containing said leucobase of a triphenyl methane dyestuff, by one or more bath treatments with an oxidizing agent and a diluted acid-and by making thereafter prints in an ordinary alcohol duplicator by means of the ordinary alcohol duplicator print liquid which in most cases contains one or more lower aliphatic alcohols.
• the new process offers the important advantage that the use of acid solutions in the alcohol duplicator is omitted avoiding in this way the corroding action on metal parts.
• Another important advantage consists therein that the dissolution of the color coupler in the acid bath is considerably counteracted in this way.
• mineral acids such as phosphoric acid, nitric acid, sul-' furic acid, and oragnic acids, such as acetic acid, citric acid, glycolic acid, sulfaminic acid and tartaric acid, are mainly considered.
• precipitating agents for the dyestuffs formed by oxidation which do not or at least little solubilize the latter in aqueous treating baths
• those can be chosen which are used for manufacturing pigments and for mordanting basic dyestuffs on textile fibers.
• Some of the most appropriate representatives are some isoor hetero-poly acids and their salts, such as alkaliand ammonium molybdates, -tungstates, phosphomolybdates, phosphotungstates, silicotungstates, phosphomolybdato-tungstates etc.
• organic acids such as dichloro acetic acid, trichloro acetic acid and sulfosalicylic acid offer interesting possibilities for application.
• the treatment of the washed image relief according to the method of the present invention is carried out in several steps.
• the master sheet can first be led through an oxidizing bath consisting of a diluted aqueous potassium permanganate solution and next through an acid bath consisting of an aqueous diluted acid wherein the precipitating agent is dissolved for the triphenyl methane dyestuif formed by oxidation.
• This precipitating agent can also be dissolved in the oxidizing bath.
• Another embodiment of the process according to the present invention consists therein that the washed image relief after treatment with an oxidizing agent is immersed in an acid solution the acid of which serves itself as precipitating agent of the dyestuif such as for instance trichloroacetic acid.
• a further and particular simple embodiment of the process according to the present invention consists therein that the washed image relief is treated with only one solution which besides the oxidizing agent also contains a precipitating acid.
• a precipitating acid instead of an acid which serves as precipitating agent for the dyestutf, also a combination of a non-precipitating acid and a precipitating agent can be chosen.
• the acid must at least for some tim be compatible with the oxidizing agent.
• the obtained mastersheet can be used, after removal of the excess of liquid, for manufacturing some tens of prints onto paper which was moistened with a print liquid mainly consisting of a lower aliphatic alcohol such as methanol, ethanol or isopropanol or of a mixture of such alcohols either mutually or with water.
• a print liquid mainly consisting of a lower aliphatic alcohol such as methanol, ethanol or isopropanol or of a mixture of such alcohols either mutually or with water.
• This print liquid can evidently also contain the usual ingredients for composing duplicator liquids.
• Such compositions are i.-a. described in J. Chem. Education, 32, 200-202 (1955) and in the American patent specifications 2,228,108, 2,262,488 and 2,294,711.
• Example 1 A material manufactured as described in British specification No. 804,076 (U.S. Serial No. 582,944, filed May 7, 1956) is reflectographically exposed through an original. After hardening development according to the above US. application Serial No. 37,101, filed June 20, 1960, the non-developed and consequently non-tanned parts of the gelatin emulsion layer are washed away. The image relief thus obtained is immersed for seconds in a 1% aqueous potassium permanganate solution whereafter the excess of solution is removed by squeezing between two rubber rollers. This image relief is then immersed for 5 seconds into a 1% aqueous trichloroacetic acid solution. The excess of liquid is then removed by squeezing between two rollers whereafter the master sheet obtained is fixed on a duplicator containing isopropanol as print liquid. With this master sheet tens of sharp prints of the original to be reproduced are obtained.
• Example 2 A gelatin relief image obtained and soaked with a potassium permanganate solution as in the foregoing example but containing leuco crystal violet instead of leuco malachite green, is immersed for 15 seconds, after removal of the excess of solution with blotting paper, in a solution of the following composition:
• Example 2 Cm. 20% aqueous citric acid 50 aqueous silicotungstic acid 5 Further treatment as in Example 1 and printing with a print liquid of the following composition: ethanol 80%, methanol 18% and methyl glycol 2%. Tens of sharp prints of the original are obtained.
• Example 4 A gelatin relief image obtained as in Example 3 is immersed for seconds in a 2.5% aqueous ammonium dichromate solution. After removal of the excess of solution, the relief image is immersed for 15 seconds into a solution consisting of:
• Example 1 cm aqueous tartaric acid 5O 10% aqueous silicotungstic acid 3 Further treatment and printing as in Example 1 gives tens of sharp prints of the original.
• Example 5 A gelatin relief image is obtained and soaked with a potassium permanganate solution as in Example 3 and the excess of liquid is, removed by squeezing between two rubber rollers. Next, the relief image is immersed into a solution of the following composition:
• Example 2 Cm. 20% aqueous tartaric acid 50 10% aqueous sodium phosphomolybdate 5 Further treatment and printing as in Example 2 gives tens of sharp prints of'the original.
• Example 6 A gelatin relief image obtained as described in Example 3 is immersed for 5 seconds into a solution of the following composition:
• Example 7 A gelatin relief image obtained as in Example 1. is immersed for seconds into a solution of the following composition:
• Example 8 A gelatin relief image obtained as in Example 1 is immersed for 3 seconds into a mixture consisting of 20 cm. of 20% aqueous trichloroacetic acid and 50 cm. of a solution of the following composition Cerium (IV)-sulfate, g. Concentrated sulfuric acid, cm. 28 Water, cm. 500
• Example 9 A gelatin relief image obtained as in Example 1 is immersed for 15 seconds into a solution of the following composition:
• (A) Said master is prepared by the steps of (1) Exposing to an indicia-bearing original to be copied a light-sensitive photographic material including a support bearing a silver halide emulsion layer containing a finely-divided, water-insoluble, potential color-forming leucobase of a triphenylmethane dyestuff, Subjecting the exposed photographic material to tanning development to form in said emulsion layer a positive latent mirror image of said original and harden the areas of said layer bearing said latent mirror image, Removing the unhardened areas of said layer -to leave a positive relief mirror image of hardened emulsion attached to said support, and Subjecting the material from step (3) to oxidation and acidification to convert said leucobase to a colored dyestulf; and (B) Prints are made from said master'resulting from (A) by pressing into contact therewith print paper;
• an alcoholic print liquid comprising essentially an alcohol selected from the group consisting of methanol, ethanol, isopropanol and their mixtures; in combination, the improvement of contacting the positive relief mirror image prior to said print-making step (B) with an aqueous solution of a basic dyestuff mordanting agent to precipitate the colored dyestuif in the hardened areas of said emulsion layer.
• triphenylmethane dyestuff is malachite green.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Color Printing (AREA)
• Printing Methods (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

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Citations (10)

• 0
  • NL NL197153D patent/NL197153A/xx unknown
  • BE BE547661D patent/BE547661A/xx unknown
  • NL NL244134D patent/NL244134A/xx unknown
  • NL NL85781D patent/NL85781C/xx active
• 1956
  • 1956-05-09 CH CH340707D patent/CH340707A/fr unknown
  • 1956-05-11 DE DEG19595A patent/DE1016127B/de active Pending
  • 1956-05-11 FR FR1149764D patent/FR1149764A/fr not_active Expired
  • 1956-05-11 GB GB14766/56A patent/GB804076A/en not_active Expired
• 1960
  • 1960-10-06 DE DEG30650A patent/DE1139021B/de active Pending
  • 1960-10-07 US US61052A patent/US3252412A/en not_active Expired - Lifetime
  • 1960-10-10 GB GB34617/60A patent/GB954206A/en not_active Expired

Patent Citations (11)

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