Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C1/00—Photosensitive materials
  • G03C1/72—Photosensitive compositions not covered by the groups G03C1/005 - G03C1/705
  • G03C1/73—Photosensitive compositions not covered by the groups G03C1/005 - G03C1/705 containing organic compounds
  • G03C1/732—Leuco dyes
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
  • G03C1/00—Photosensitive materials
  • G03C1/675—Compositions containing polyhalogenated compounds as photosensitive substances

Definitions

• the invention is unique in that, in carrying out the process, all the ingredients on the copy sheet are dry; in that only visible light is necessary to produce a copy of the graphic material; and in that only moderate heat is required to fix the copy sheet.
• the light-sensitive record sheet may be a pliable sheet material, such as paper, to which is applied, in the dark, as a solution in toluene or equivalent solvent, a mixture of a substantially colorless dye or dye intermediate, such as crystal violet lactone, and carbon tetrabromide, the sheet then being dried by evaporation of the solvent.
• the record sheet thus prepared is sensitive to visible light, and the sheet including the coloration produced by exposure to such light may be fixed by driving off the unused or unreacted carbon tetrabromide by heating the record material to a temperature between room temperature and about 100 degrees centigrade, depending on the dye.
• the primary object of this invention is therefore to provide a light-sensitive record sheet material having thereon a dry mixture of ingredients which produce a darker distinctive color in areas subjected to visible light rays.
• Another object is to provide a light-sensitive sheet as described in which the light-sensitive ingredients are inactivated by heat against further color change, thus insuring that subsequent exposure of the copy sheet to visible light will not affect the image formed by the first exposure of the copy sheet to visible light.
• a further object is to provide a process for copying light-blocking graphic data disposed on master sheet material otherwise translucent Or transparent to visible light which includes the steps of (1) passing visible light through the transparent portions of the master sheet onto a novel light-sensitive copy sheet held in contact registery therewith, and (2) fixing the sheet, bearing the colored image formed in said first step, by heating the copy sheet to inactivate light-sensitive ingredients remaining on said sheet.
• Any substantially colorless color-reactive materials such as certain dyes and dye intermediates, which produce a distinctive color when exposed to visible light in the presence of carbon tetrabromide, the color being fixable by heat alone, may be used to sensitize the copy sheet of this invention.
• dyes and dye intermediates and derivatives which may be cited to illustrate but not to limit the invention include substantially colorless compounds such as color-reactive materials selected from the class consisting of (1) a triphenyl methane dye derivative, (2) a leuco methylene blue dye derivative, (3) a leucauramine dye derivative, (4) a xanthene dye derivative, and (5) the dihydril ether of Michlers hydrol.
• substantially colorless compounds such as color-reactive materials selected from the class consisting of (1) a triphenyl methane dye derivative, (2) a leuco methylene blue dye derivative, (3) a leucauramine dye derivative, (4) a xanthene dye derivative, and (5) the dihydril ether of Michlers hydrol.
• Graphic copies thus formed on such visible-light-sensitive copy sheets are fixed by fixing the whole copy sheet against further change by exposure to visible light by subjecting the exposed copy sheet to a temperature ranging from slightly above room temperature to about 100 degrees centigrade, for a period of time suflicient to remove from the copy sheet the residual carbon tetrabromide not affected by the color-forming reaction.
• the amount of heat necessary for such removal obviously varies considerably; for example, in most carbon-tetrabromide-dye-base sheet combinations, removal of carbon tetrabromide is complete within a matter of seconds with ordinary record materials and heat sources, even at moderate temperatures. In other combinations, the copy sheet must be heated for longer periods due to variance rial such as gelatin or polyvinyl alcohol.
• the copy sheet containing the carbon-tetrabromidecolor-reactive-material mixtures of this invention is normally yellow in color. After controlled exposure of a sheet to visible light, those portions of the sheet which have not been subjected to said light retain the yellow color, but heating the copy sheet removes the yellow color, the color generally being replaced by a light-gray color, this background color change presumably being due to diminution of the carbon tetrabromide.
• a color intensification of the image is produced by heating the copy sheet when certain combinations of carbon tetrabromide and colorless color-reactive materials are included on said sheet; for example, the blue-colored image formed by exposing to visible light a copy sheet containing a mixture of carbon tetrabromide and the dihydril ether of Michlers hydrol is intensified by such heating.
• a preferred embodiment of the copy sheet of this invention consists of sheet material, such as a sheet of paper, organic polymer film, or the like, coated or impregnated, preferably in the dark, with a solution consisting of the following:
• the sensitized portion of the record material be it a coating or an impregnating composition containing the light-sensitive ingredients of this invention.
• suitable amounts of color-reactive materials and carbon tetrabromide may be dissolved in acetone and then added to an approximately ten percent aqueous solution of a hydrophilic polymeric film-forming mate Base material, such as paper, either coated or impregnated with the acetone composition of this example and then dried by evaporation of the solvent, provides a visible-lightsensitive copy sheet wherein the Visible-light-sensitivc ingredients are held dispersed in an essentially dry hydrophilic polymeric material binder carried by said base sheet material.
• Areas on the copy sheet which have not yet been exposed to light, and which, at this stage, are still sensitive to light, may be fixed and inactivated against further change to the effects of visible light by heating the copy sheet, preferably in the absence of light, to a temperature ranging from about 25 degrees centigrade to 100 degrees Centigrade, such as placing it on a hot plate or in an oven, or exposing it to infra-red rays until it is rendered unresponsive to further exposure to visible light.
• the novel copy sheet of this invention also finds valuable application when used with a lens system which may serve to enlarge or reduce either a positive image or a negative image to be copied.
• the positive or negative to be copied is subjected to projected visible light rays, the projected rays being focused through a lens system through the master sheet onto the lightreactive surface of the copy sheet, thus providing either an enlarged image or a reduced image of the graphic material original, depending on the optics involved.
• Light-sensitive copying material comprising a sheet support and having disposed on said support a composition which assumes a distinctive color when exposed to visible light, said composition consisting of (a) a substantially colorless color-reactive material selected from the class consisting of (1) a triphenyl methane dye selected from the group consisting of crystal violet lactone, malachite green lactone, and 2-(p-nitrophenyl)-4,4-bis (p dimethylaminophenyl) 7 dimethyl-amino-3,l,4- benzoxazine, (2) a lenco methylene blue dye selected from the group consisting of benzoyl, naphthoyl, 10-noctanoyl, l-(4-anisoyl), and IO-cinnamoyl leuco methylene blue; (3) a leucauramine dye having the following structural formula wherein R represents a substituent selected from the class consisting of N-(halophenyl), N-(alkylhalopheny
• Light-sensitive copying material comprising a sheet support and having disposed on or within said support a composition which assumes a distinctive color when exposed to visible light, said composition consisting of (a) the substantially colorless material 3, 3-bis (4-dimethylaminophenyl)-6-dimethylaminophthalide and (b) carbon tetrabromide.
• a process for producing a copy of graphic data disposed on a master sheet translucent to visible light except for the graphic data including the steps of passing visible light through the still-transparent areas of the master sheet onto a copy-receiving sheet having thereon, as an intimate mixture, a dried residue of carbon tetrabromide and a substantially colorless color-reactive material which turns to a distinctive strong color in the presence of said carbon tetrabromide when exposed to visible light, said material being selected from the class consisting of (1) a triphenyl methane dye selected from the group consisting of crystal violet lactone, malachite green lactone, and Z-(p-nitrophenyl)-4,4-bis(p-dimethyl aminophenyl)-7-dimethyl-amino-3,1,4-benzoxazine, (2) a leuco methylene blue dye selected from the group consisting of benzoyl, naphthoyl, IO-n-octanoyl, l0-(4-ani
• a process for producing graphic data including the steps of illuminating a copy sheet with an image of the graphic data in terms of visible light, the sheet containing intermixed, in the dry state, as the only photochemically active ingredients, carbon tetrabromide and 3,3-bis(4-dimethylarninophenyl) 6-dimethylaminophthalide which turns to a distinctive color when illuminated with visible light; and fixing the colored image on the copy sheet by subjecting the whole sheet to heat sufiicient to remove from said sheet the carbon tetrabromide which was not affected by the color-forming visible-light-sensitized reaction.
• a light-sensitive copying process for producing permanent copies from a graphic original consisting of (l) positioning a thin translucent pliable master sheet of material, having on one surface graphic data to be copied, said graphic data being defined in terms of areas which absorb visible light, in a smooth face-to-face relation with a copy sheet senstive to visible light, which copy sheet is provided with a composition colorable to a distinctive color by exposure to visible light, the composition consisting of a dry mixture of 3,3-bis(4-dimethylaminophenyl)-G-dimethylaminophthalide and carbon tetrabromide, (2) subjecting the two sheets so positioned to visible light rays so that said light will pass through the translucent master sheet, except where prevented from such passage by the light-absorbing areas, to provide a light pattern on the copy sheet which corresponds to the light transmitted through the master sheet, said light inducing a reaction in the light-sensitive composition which without perceptible delay results in the production of a distinctively colored image, and (3) fixing the colored image so formed by
• a process for producing a copy of graphic data existing on a translucent master sheet in terms of light- References Cited in the file of this patent blocking areas including the step of exposing with visible UNITED STATES PATENTS light through said master sheet as a light mask, a copy 1,782,259 Eggert et aL 13 1930 sheet including a homogeneous mixture consisting of 5 2 344 4 5 Chaikley J ly 22 195 (a) 3,3-bis(4-dimethy1amino phenyl)-6-din1ethylamino- 3,042,515 Wainer July 3, 1962 phthalide, and (12) carbon tetrabromide. FOREIGN PATENTS 8.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Heat Sensitive Colour Forming Recording (AREA)

Priority Applications (8)

Applications Claiming Priority (1)

Publications (1)

Family

ID=22186977

Family Applications (1)

Country Status (8)

Cited By (12)

Families Citing this family (5)

Citations (5)

• 0
  • NL NL273984D patent/NL273984A/xx unknown
  • BE BE612013D patent/BE612013A/xx unknown
• 1961
  • 1961-01-25 US US84749A patent/US3140947A/en not_active Expired - Lifetime
  • 1961-12-01 GB GB43045/61A patent/GB917919A/en not_active Expired
  • 1961-12-28 SE SE13057/61A patent/SE312975B/xx unknown
• 1962
  • 1962-01-22 FR FR885458A patent/FR1311084A/fr not_active Expired
  • 1962-01-23 DE DEP1268A patent/DE1268966B/de active Pending
  • 1962-01-23 CH CH82062A patent/CH406255A/fr unknown

Patent Citations (5)

Also Published As

Similar Documents