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Publication numberUS3649332 A
Publication typeGrant
Publication dateMar 14, 1972
Filing dateOct 24, 1969
Priority dateOct 24, 1969
Publication numberUS 3649332 A, US 3649332A, US-A-3649332, US3649332 A, US3649332A
InventorsDouglas H Dybvig
Original AssigneeMinnesota Mining & Mfg
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Color printing
US 3649332 A
Porous intermediates printed with color transfer images serve as barriers during heat transfer of dye simultaneously from imaged intermediate and overlying dye transfer source sheet to provide brilliantly colored image and background areas on receptor sheet or film.
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Description  (OCR text may contain errors)

United States Patent D bvi Mar. 14 1972 [54] COLOR PRINTING 2,770,534 11/1956 Marx, .lr. ..41/41 3,121,650 2/1964 Meissner .1..156/240 [72] Invent Paul 3,280,735 10/1966 Clark et al. .101/149.2 [73] Assignee: Minnesota Mining and Manufacturing 3,330,711 7/1967 Marx, Jr. et al... ..1 17/38 Company, St. Paul, Minn. 3,360,367 12/1967 Stricklin ....1l7/1.7 X 3,379,526 4/1968 Limberger et al. ..96/1 [221 1969 3,453,310 7/1969 Arneth et a1 ..96/1.2 [21] Appl. No.: 869,008 3,490,371 1/1970 Games ..117/1.7 X

Primary ExaminerRobert F. Burnett [52] US. "117/38, l Assistant Examiner-Raymond Linker, Jr.

1 36.7, 1 17/ 37 R Attorneyl(inney, Alexander, Sell, Steldt & Delahunt [51] Int. Cl ..B4lm 5/00 [58] Field of Search ..1 17/1 .7, 36.2, 36.7, 38,138.8, [57] ABSTRACT 30 u 8/2 5 Porous intermediates printed with color transfer images serve as barriers during heat transfer of dye simultaneously from [56] References Cited imaged intermediate and overlying dye transfer source sheet to provide brilliantly colored image and background areas on UNITED STATES PATENTS receptor Sheet or Sanders ..117/1.7

6 Claims, 2 Drawing Figures PATENTEDMAR 14 m2 3,649 33 2 I N VENTOR 0006M: #076 we COLOR PRINTING This invention relates to the preparation of colored prints, and has for a major object the preparation on transparent film of colored prints wherein the image areas may be in one or several colors and the background areas in another color, the prints being useful as color projection transparencies.

A method of making prints of multicolored originals in full color has recently been described in Wiese application Ser. No. 728,167, and apparatus useful in accomplishing such method has been described in Dybvig et al. application Ser. No. 728,169 now abandoned, both filed on May 10, 1968. The method involves exposing a series of photosensitive dye transfer sheet segments to a light pattern from the multicolor original through appropriate monocolor filters, developing a transposed differentially radiation-absorptive pattern at each segment, and briefly subjecting each patterned segment to intense radiation while in registry and in contact with a receptor sheet to transfer the appropriate complementary dyes from the segment to the receptor.

The apparatus includes a vacuum platen means for supporting the dye transfer sheet against and in close pressure contact with the receptor sheet. The receptor must therefore be porous; and porous paper, or film which has been perforated to provide porosity, is therefore commonly used as the receptor sheet. But papers of sufficient porosity to permit close contact with the transfer sheet are found to permit passage of volatile dyes. As an example, such paper is found to be inadequate as a liner when wound up in a roll of the segmented source sheet. Under moderately prolonged storage the volatilizable dyes are found to penetrate through the liner in amount sufficient to cause discoloration of the photosensitive surface coating on the reverse side of the sheet.

In view of the slow migration of dye through the porous paper under normal storage conditions, it might be expected that the application of much higher temperatures would greatly increase the migration of the dye. Surprisingly, it has been discovered that, under the conditions here employed, the porous receptor serves as a completely effective barrier to the passage of the volatilized dye. Accordingly it has been found possible first to form a full-color dye image on a porous receptor by the techniques and with the apparatus to which reference has hereinbefore been made, and then to retransfer the image to a permanent receptor while simultaneously transferring thereto a different color exclusively at background or nonimage areas from a color source sheet overlying the entire area.

In the drawing,

FIG. 1 is an exploded view in perspective showing the relationship of the various components in preparing a color projection transparency, and

FIG. 2 is a plan view of the resulting transparency.

Referring to FIG. 1, a permanent receptor 10, which may for example be a full lOXlO inch sheet of clear transparent dye-receptive polyester film, is supported on a suitable platen 11. Segments 12, 13, 14 of temporary receptor sheet material which have previously been imprinted with transfer dye images are placed face down at desired positions on the receptor 10, as indicated by dotted lines. A further full size portion 15 ofa dye source sheet is placed face down over the segments and the receptor. A heated platen 16 is then pressed temporarily against the composite, causing volatilization and transfer of dyes and a corresponding coloration of the receptor 10. The platens are then separated and the sheet 10 removed.

The finished product is shown in FIG. 2 as the transparent film 10 now uniformly colored over the entire background area 17, printed with multicolored images or designs 18-20, and uncolored at closely surrounding areas 21-23 corresponding in external dimension to segments 12-14 respectively.

EXAMPLE As described in said application Ser. No. 728,167, the photosensitive dye transfer sheets may comprise a photoconductive zinc oxide coating on one surface and separate coatings of magenta, yellow and cyan dyes in sequence on the reverse surface. With these three dyes a close approximation of the colored original may be formed.

The dye source sheet 15 may contain a single dye or a mixture of dyes, and in any desired concentration, depending on the specific color and intensity desired for the background areas. Ethyl cellulose is a preferred binder and toluene a preferred solvent, although other materials may be used. The addition of an inert powder such as silica powder is helpful both in obtaining a smooth homogeneous coating Composition and in obtaining rapid and uniform transfer of dye.

The dyes employed in the dye source sheet should have sub stantially the same volatility as those of the photosensitive dye transfer sheets, and indeed the identical dyes may be used in both instances. Specific examples include N,N-dielh vl-ptricyanovinyl aniline as the magenta dye. Sudan Yellow G.R. Conc. as the yellow dye, and 2-chloro-2'-methyl-n,n-diethylindoaniline as the cyan dye. A typical coating formula includes 7.9 parts by weight of ethyl cellulose, 1 part ofpowdered silica (Syloid 244), 91.1 parts of toluene, and 1 part of magenta or cyan dye or 1.5 parts of yellow dye. Smooth coating properties are obtained by thorough homogenization of the mixture and by selection of an ethyl cellulose of appropriate viscosity or by variation in the proportion of volatile solvent. The several mixtures are coated on 37 lb. paper at a coating weight, after drying, ofapproximately 9.4 g./sq. ft. (4.3 g./sq. m.). Mixtures of these same dyes may be used to provide other desired colors. As an example, a coating containing 0.9 part of the cyan dye and 0.1 part of the magenta dye produces a deep blue color on the receptor sheet. Again, a coating containing 0.24 part of the magenta dye and 0.013 part of the yellow dye produces a pastel pink color on the receptor sheet.

An illustrative procedure will now be described. A first photosensitive dye transfer sheet is placed against a porous paper temporary receptor sheet on a vacuum platen and a vacuum is established, holding the two in close contact and in fixed position. The transfer sheet carries a dye coating on the surface contacting the receptor sheet, and a photoconductive zinc oxide coating on the outer surface. The outer surface is exposed to a color separation light image from a positive color print original, to impart a latent image. A conductive roller carrying a coating of conductive radiation-absorptive toner particles and at a high potential is passed over the exposed surface to deposit toner at the nonlight-struck areas. The surface is then briefly exposed to intense infra-red radiation, causing transfer of dye to the temporary receptor at the infrared absorptive toned areas. The vacuum is released, the photosensitive sheet is removed and replaced with a second photosensitive sheet carrying a second dye, and the process is repeated using an appropriate color separation filter. The process is again repeated using a third filter and sensitive sheet, to produce a full three-color intermediate but of dull, lifeless appearance.

One or more portions of the intermediate, for example three detail sections as indicated by segments 12-14 of FIG. 1, are cut from the sheet. These segments are placed against a transparent dye-receptive film in desired arrangement, and over them is placed a paper dye source sheet having a blue dye coating as previously described herein but minus the photoconductive coating of the transfer sheet. The three layers are pressed together and briefly heated, i.e., for 2 minutes at 275 R, either between platens as in FIG. 1 or by holding under tension over a single convexly curved platen. The film is removed and is found to retain a brilliantly clear full color copy of the detail sections on an equally clear blue background.

The dye-receptive film consists of a transparent Mylar polyester film coated with a transparent coating of a mixture of 1.5 parts of nickel acetate tetrahydrate and 10 parts of polyvinyl alcohol, applied from solution in Water which may if necessary contain just sufficient wetting agent and antifoaming agent to provide smooth uniform coating characteristics.

The dry weight of the coating is about one-half g./sq. ft. (5.4 g./sq. m.). The coating serves as a solvent and fixative for the dyes so that the colored areas do not cause diffusion of light transmitted therethrough and the colored film serves as a color projection transparency. Similar coatings may be applied to nontransparent substrates, e.g., to paper or metal, where transparency is not required.

What is claimed is as follows:

1. Method of simultaneously imprinting a colored design and a colored background on a permanent color receptor sheet comprising applying a said design in volatilizable dye to a temporary intermediate receptor sheet segment, placing said segment against said permanent receptor sheet, placing a color source sheet carrying a volatilizable dye over said segment and against said permanent receptor sheet, and heating said source sheet to an extent sufficient to cause transfer of said dyes to said permanent receptor sheet, the said segment serving as a mask for preventing the dye from reaching said permanent receptor sheet from said source sheet at the masked area.

24 Method of claim 1 wherein said intermediate sheet is a porous paper and said design is applied to said paper by selective transfer of dye from separate monocolor source sheets by selective heating of color separation image areas while said source sheets are in close pressurecontact with said intermediate sheet.

3. Method of claim 1 wherein said permanent receptor sheet is a clear transparent film having at least a surface stratum in which said dye is soluble.

4. Method of claim 2 wherein the porosity of said intermediate sheet is sufficient to permit attaining close contact between said sheet and a photoconductive zinc oxide coated dye transfer sheet on a vacuum platen.

5. Method of claim 3 wherein said surface stratum comprises a nickel salt and polyvinyl alcohol.

6. Method of claim 1 wherein said color source sheet is uniformly coated over one entire surface with said volatilizable dye.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2360587 *Jul 21, 1942Oct 17, 1944Louis S SandersMethod of preparing camera copy for multicolor printing
US2770534 *May 10, 1953Nov 13, 1956Printing Arts Res Lab IncMethod and material for making overlay masks
US3121650 *Jul 28, 1960Feb 18, 1964Minnesota Mining & MfgRight-reading reproduction of printed originals
US3280735 *Apr 13, 1964Oct 25, 1966Minnesota Mining & MfgHeat-copying process
US3330711 *Apr 30, 1963Jul 11, 1967Printing Arts Res Lab IncMethod for transfer of graphic images
US3360367 *Mar 15, 1966Dec 26, 1967Minnesota Mining & MfgCopying of graphic images
US3379526 *Dec 15, 1964Apr 23, 1968Lumoprint Zindler KgMethod of producing images by using electrophotographic material
US3458310 *Jan 8, 1965Jul 29, 1969Kalle AgElectrophotographic color printing
US3490371 *Oct 4, 1965Jan 20, 1970Imagic LtdCopying processes
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3922445 *May 18, 1973Nov 25, 1975Dainippon Printing Co LtdHeat transfer printing sheet
US3940246 *Sep 19, 1973Feb 24, 1976Ciba-Geigy AgSublimation transfer and isocyanate fixation of amino- or hydroxy-containing dyestuffs and transfer sheets therefor
US4029467 *Jan 8, 1976Jun 14, 1977Ciba-Geigy AgSublimation transfer and diisocyanate fixation of amino- or hydroxy-containing azo dyestuffs and transfer sheets thereof
US4063878 *Nov 12, 1975Dec 20, 1977Minnesota Mining And Manufacturing CompanyApplying sublimation indicia to pressure-sensitive adhesive tape
US4181497 *Jun 10, 1976Jan 1, 1980Armstrong Cork CompanyProcess for shading during the vapor phase dyeing of carpet
US4223057 *May 16, 1977Sep 16, 1980Thomas RejtoSimultaneous transfer printing and embossing or surface texturing method, and embossing member for use therein
US4231743 *Apr 16, 1979Nov 4, 1980Armstrong Cork CompanyProcess for shading during the vapor phase dyeing of carpet
US4242092 *Dec 20, 1978Dec 30, 1980Glover Richard DMethod of sublimatic printing on sheet structures
US4984517 *Sep 29, 1986Jan 15, 1991Luc DoubletMethod of multicolor printing a material
US5580410 *Dec 14, 1994Dec 3, 1996Delta Technology, Inc.Pre-conditioning a substrate for accelerated dispersed dye sublimation printing
US6814831Feb 26, 2002Nov 9, 2004Fresco Plastics LlcMethod and apparatus for continuously forming dye sublimation images in solid substrates
US6998005Mar 29, 2001Feb 14, 2006Fresco Plastics LlcMethod and apparatus for forming dye sublimation images in solid plastic
US7810538Aug 15, 2005Oct 12, 2010Fresco Plastics LlcMethod and apparatus for forming dye sublimation images in solid plastic
US8308891Aug 22, 2006Nov 13, 2012Fresco Technologies, Inc.Method for forming dye sublimation images in solid substrates
US8562777Sep 23, 2004Oct 22, 2013Fresco Plastics LlcMethod and apparatus for continuously forming dye sublimation images in solid substrates
US20020148054 *Feb 26, 2002Oct 17, 2002Drake Jonathan C.Method and apparatus for continuously forming dye sublimation images in solid substrates
US20030192136 *Mar 29, 2001Oct 16, 2003Magee Ted N.Method and apparatus for forming dye sublimation images in solid plastic
US20060028531 *Aug 15, 2005Feb 9, 2006Fresco Plastics Llc A California CorporationMethod and apparatus for forming dye sublimation images in solid plastic
EP0227565A2 *Aug 25, 1986Jul 1, 1987Etablissements DoubletProcess for printing a material
EP0227565A3 *Aug 25, 1986Dec 14, 1988S.A. Doublet FestitubProcess for printing a material
U.S. Classification427/282, 8/471, 427/391, 428/914, 427/152
International ClassificationB41M5/025
Cooperative ClassificationB41M5/0256, Y10S428/914
European ClassificationB41M5/025N