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
  • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
  • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
  • B41M5/42—Intermediate, backcoat, or covering layers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
  • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
  • B41M2205/00—Printing methods or features related to printing methods; Location or type of the layers
  • B41M2205/02—Dye diffusion thermal transfer printing (D2T2)
• • 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
  • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
  • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
  • B41M5/405—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography characterised by layers cured by radiation
• • 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
  • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
  • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
  • B41M5/42—Intermediate, backcoat, or covering layers
  • B41M5/426—Intermediate, backcoat, or covering layers characterised by inorganic compounds, e.g. metals, metal salts, metal complexes
• • 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
  • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
  • B41M5/40—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used characterised by the base backcoat, intermediate, or covering layers, e.g. for thermal transfer dye-donor or dye-receiver sheets; Heat, radiation filtering or absorbing means or layers; combined with other image registration layers or compositions; Special originals for reproduction by thermography
  • B41M5/42—Intermediate, backcoat, or covering layers
  • B41M5/44—Intermediate, backcoat, or covering layers characterised by the macromolecular compounds
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S428/00—Stock material or miscellaneous articles
  • Y10S428/913—Material designed to be responsive to temperature, light, moisture
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S428/00—Stock material or miscellaneous articles
  • Y10S428/914—Transfer or decalcomania
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
  • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31855—Of addition polymer from unsaturated monomers

Definitions

• the invention relates to an image receiving material for thermal dye transfer processes with an intermediate layer and a color receiving layer and a process for its production.
• Thermal dye transfer systems (Dye Diffusion Thermal Transfer - D2T2) electronically generate images of originals.
• the templates are broken down into the basic colors cyan, magenta and yellow and, if necessary, black and converted into electrical impulses. These impulses are forwarded to a thermal printer, where they are converted into heat in the print head.
• the image-receiving material passes through the thermal printer in contact with a color donor element.
• the back of a color donor element is heated in the printhead in accordance with the pulse specifications and a dye is released, which diffuses or sublimes into the receiving layer of the image receiving material. This process is carried out one after the other for all colors and then results in the finished image.
• thermoplastic high molecular weight materials before the image-receiving layer is applied.
• These high molecular weight thermoplastics can be polyolefins, polystyrene, polyvinylidene chloride, polyethylene terephthalate, polymethyl methacrylate or ionomer resin.
• This intermediate layer made of thermoplastics is intended to level out the unevenness of the paper surface.
• No. 4,774,224 also describes an image-receiving material for thermal dye transfer with a paper carrier which is provided with a thermoplastic intermediate layer, which preferably consists of polyolefin.
• a thermoplastic intermediate layer which preferably consists of polyolefin.
• the surface roughness of the intermediate layer should be limited to ⁇ 0.2 ⁇ m (7.5 Ra ⁇ inch).
• EP 407 613 describes an image receiving material with likewise thermoplastic intermediate layers.
• the thermoplastics are preferably polyolefins, polyvinyl chloride, polystyrene, polyethylene terephthalate, polymethacrylate or polycarbonate.
• the surface roughness of the intermediate layer in this patent is between 0.2 and 4.0 ⁇ m.
• thermoplastic intermediate layer between the paper base material and the image-receiving layer.
• the thermoplastic intermediate layer is intended to improve the quality of the transferred image.
• the materials used for the intermediate layer are lacquers made from monomers, oligomers or prepolymers, but mostly from mixtures of these groups.
• the monomers in particular serve as diluents in the paint.
• Monomers can advantageously be dispensed with if the coating compositions are processed at elevated temperature, preferably 30 ° C. to 60 ° C.
• the crosslinkable compounds should preferably consist of more than 50% by weight of acrylic acid and / or methacrylic acid esters.
• the lacquers (before crosslinking) can advantageously be filled with white pigments, such as carbonates, oxides, sulfates or sulfites of the elements calcium, magnesium, barium, strontium, zinc or titanium. Because of its high refractive index, titanium dioxide has proven particularly useful. Varnishes that contained up to 70% by weight of titanium dioxide were successfully processed. This gives the background a high level of light reflection and makes the images appear more brilliant.
• white pigments such as carbonates, oxides, sulfates or sulfites of the elements calcium, magnesium, barium, strontium, zinc or titanium. Because of its high refractive index, titanium dioxide has proven particularly useful. Varnishes that contained up to 70% by weight of titanium dioxide were successfully processed. This gives the background a high level of light reflection and makes the images appear more brilliant.
• the paints can contain up to 20% by weight of auxiliaries, such as non-crosslinkable resins, optical brighteners, matting agents, dyes and photoinitiators.
• auxiliaries such as non-crosslinkable resins, optical brighteners, matting agents, dyes and photoinitiators.
• the varnish After the varnish has been applied to the substrate, it is cross-linked by high-energy radiation.
• This radiation can be electron radiation or UV radiation.
• UV lamps When UV lamps are used, photoinitiators must be added to the paint to form radicals that trigger the crosslinking reaction.
• the varnish can be spread onto the carrier material using conventional application units such as doctor or gap metering systems, anilox rollers or multi-roller systems.
• the paint is cross-linked in contact with high-gloss metal surfaces or high-gloss cylinders by irradiation with high-energy electrons.
• the irradiation with the accelerated electrons takes place from the rear, i.e. from the uncoated side of the carrier material.
• the electrons have to be accelerated in such a way that their penetration depth exceeds the thickness of the carrier material plus the lacquer layer. This technique is described in DE 30 22 709.
• the carrier material can also be coated on both sides or pre-coated on one or both sides with thermoplastics such as polyolefins.
• thermoplastic layer which acts as a barrier layer under the interlayer of cross-linked lacquer, prevents the lacquer applied from penetrating (knocking away) into the paper and saves lacquer material.
• the finished image is resistant to aging and heat thanks to the intermediate layer.
• the coating composition should be free from organic solvents.
• pretreatments such as a corona discharge have proven effective.
• a neutral gummed paper with 175 g / m2 basis weight with alkyl ketene dimer was coated on one side with 25 ⁇ 2 g / m2 according to the following paint formulations (coating compound) with a multi-roller application system at a machine speed of 60 m / min. Corona pretreatment of the paper surface was carried out before coating.
• the coated paper was irradiated by means of accelerated electrons at an energy dose of 40 kJ / kg coating mass. Curing took place in a scanner system with a maximum of 180 kV and 100 mA electron current under nitrogen as an inert gas. The subsequent application of the image-receiving layer will be described later.
• the cured intermediate layers have the following composition: (all figures in% by weight).
• a 135 g / m2 basis weight paper sized with stearic acid, alkyl ketene dimer and epoxidized fatty acid amide was coated on both sides with polyethylene (front 20 g / m2, back 25 g / m2) using the melt extrusion process and after a corona pretreatment on the front with 20 ⁇ 2 g / m2 coated according to the following paint formulations under the conditions as in Example 1.
• the coated paper was pressed with the layer side against a water-cooled high-gloss cylinder and irradiated from the back of the paper by means of accelerated electrons at an energy dose of 35 kJ / kg of coating material in the system and under the inert gas, as in Example 1.
• the cured intermediate layers have the following composition: (all figures in% by weight).
• the base paper from Example 2 was extrusion coated on both sides with polyethylene. The back became one with 28 g / m2 coated.
• the front was made with a mixture of 22 g / m2 coated.
• the machine conditions corresponded to those from Example 1.
• the application weights per shift were 18-20 g / m2. Corona pretreatment was carried out before each coating.
• Example 1 The carrier materials from Example 1, Example 2 and Comparative Example V1 provided with an intermediate layer were coated with the following coating composition from aqueous solution using a roller application unit after a corona pretreatment to form the image-receiving layer:
• the machine speed was 130 m / min., The drying temperature was 110 ° C.
• the application weight after drying was 5 - 7 g / m2.
• the video printer has the following technical data: Image storage PAL 1 full screen memory Printed image 64 color image elements: 540: 620 points Printing time 2 minutes / picture
• the color density of the individual colors of the images obtained was measured using the original reflection densitometer SOS-45.
• a line grid was selected for the individual primary colors and the line widths were measured for testing the aging and heat resistance . Since the measurement results of the individual primary colors (cyan, magenta, yellow) were only slightly differentiated, but mostly identical, the table below shows the averaged value of the three primary colors.
• the imaged image-receiving materials without a cross-linked intermediate layer show significantly lower heat and aging resistance than those according to the invention, which is reflected in an increase in the line width.
• Cross-linked intermediate layers combined with cross-linked image-receiving layers, result in images with greatly reduced color density; the lower values of color density mean paler colors.

Landscapes

• Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• Thermal Transfer Or Thermal Recording In General (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=6432350

Family Applications (1)

Country Status (4)

Cited By (7)

Families Citing this family (1)

Family Cites Families (10)

• 1991
  • 1991-05-24 DE DE4116994A patent/DE4116994A1/de active Granted
• 1992
  • 1992-03-06 EP EP19920103825 patent/EP0514631B1/fr not_active Expired - Lifetime
  • 1992-05-04 US US07/877,992 patent/US5302572A/en not_active Expired - Fee Related
  • 1992-05-20 JP JP12704192A patent/JPH05139060A/ja active Pending

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events