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
  • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
  • B41M5/52—Macromolecular coatings
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B44—DECORATIVE ARTS
  • B44D—PAINTING OR ARTISTIC DRAWING, NOT OTHERWISE PROVIDED FOR; PRESERVING PAINTINGS; SURFACE TREATMENT TO OBTAIN SPECIAL ARTISTIC SURFACE EFFECTS OR FINISHES
  • B44D3/00—Accessories or implements for use in connection with painting or artistic drawing, not otherwise provided for; Methods or devices for colour determination, selection, or synthesis, e.g. use of colour tables
  • B44D3/18—Boards or sheets with surfaces prepared for painting or drawing pictures; Stretching frames for canvases
• • 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
  • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
  • B41M5/52—Macromolecular coatings
  • B41M5/5218—Macromolecular coatings characterised by inorganic additives, e.g. pigments, clays
• • 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
  • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
  • B41M5/52—Macromolecular coatings
  • B41M5/5236—Macromolecular coatings characterised by the use of natural gums, of proteins, e.g. gelatins, or of macromolecular carbohydrates, e.g. cellulose
• • 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
  • B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
  • B41M5/52—Macromolecular coatings
  • B41M5/5254—Macromolecular coatings characterised by the use of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers

Definitions

• ABSTRACT Ink jet images are produced by spraying the recording substrate with a fine jet of a coloured liquid which is mudulated according to the image.
• the new type of recording material consists of a transparent or opaque substrate and an image receiving layer is formed by a molecular disperse or colloidal disperse substance. It is important that the image receiving layer should be wetted by the coloured liquid and that, after spraying, the coloured liquid should penetrate the layer to a depth of at least several microns. Ink jet images of high quality can be obtained with such a recording material.
• This invention relates to a recording material for inkjet images which are produced by spraying a fine jet of a coloured liquid which is modulated according to the image.
• the recording material basically comprises a transparent or opaque substrate and an image receiving layer on this substrate.
• a recording technique has recently become known by the term ink-jet, process, in which technique a very fine jet of coloured liquid sprayed from a capillary tube is modulated in density according to theimage by an electric field.
• the jet of coloured liquid from the capillary impinges on the substrate at a high velocity (approximately 20 m/sec).
• the ink jet process has been described, for example, in German Auslegeschrift DT-AS No. 1,271,754 and in British Patent Specification No. 1,123,587.
• the materials used for recording substrates have previously been paper or synthetic resin materials resembling paper in consistency or transparent foils, depending on whether the image to be produced is a transparency or an image viewed by reflected light.
• the substrates used for the production of transparencies by the ink-jet process are generally transparent foils (e.g. Cellite or polyester) but these foils generally have the disadvantage that their surfaces repel dye solutions, and the ink droplets coalesce to larger drops on the surface. Continuous colour surfaces are therefore not obtained.
• the individual properties in which improvement is required are:
• the dye solution should not run after it has been sprayed on the surface and it should be fixed as quickly as possible on, or also in, the image receptor layer.
• a gloss effect is desired in order to achieve high visual density of reflection and high colour brilliance in reflection copies.
• the image receiving layer comprises, according to the invention, of a moleculae disperse or colloidal disperse substance which is wetted by the coloured liquid and into which the sprayed coloured liquid preferably penetrates to a depth of at least several microns.
• the image receiving layer preferably consists of a protein, polysaccharide, cellulose or cellulose derivative, polyvinyl alcohol or a copolymer of vinyl alcohols.
• Image receiving layers of gelatine, albumen or casein are found to be particularly suitable. Very good results.
• an image receiving layer consisting of a hydrophilic silica gel.
• a gloss effect can advantageously be produced by casting the image receiving layer on a layer of a polyolefine such as polyethylene or a polypropylene.
• An alternative method of producing a glass effect consists of pouring a layer of polyolefin or'polypropylene onthe image receiving layer after the recording has been made.
• a glossy surface on the image receiving layer can also be produced by heating in a glaiing press or by calender-
• the new recording material fulfils the above mentioned requirements very satisfactorily and-in particular the resolution and brilliance can be substantially in,-
• an ink (aqueous solution of a cyan, magenta or yellow dye) which has a viscosity of 1.2 cp at room temperature is sprayed at a pressure of 40 excess atmospheres through a glass capillary which has anopening of 7 pm.
• the scanning velocity i.e. the relative velocity between the recording substrate and the ink-jet, is 5 m/sec. With scan line densities of 10 lines per mm, viewing densities on reflection copies of between 1.0 and 1.3 are obtained in the case of a single colour. Reflection copies of very high quality were obtained under these conditions in the following image receiving layers:
• EXAMPLE 1 A suitably pigmented paper (e.g. the photographic raw paper weighing g/m manufactured by Schoeller, Burg Gretesch) was coated with a gelatine layer with the addition of AGEPON as wetting agent and chrome alum as hardener. The layer had a thickness of 10 pm when dry. The dye penetrated the layer to a depth of about 4 pm, as shown by a thin layer section under the microscope. The depth of penetration of the dye could be adjusted by varying the quantity of hardener added. In the case of the reflection copies, it was seen under the microscope that the track of a single scan line had a width of less than 50 um whereas in uncoated paper this track spread to a width of about ,u.m. When the ink was sprayed under the conditions defined above, viewing densities obtained on reflection copies were 1.1 for a single colour as compared with 0.7 in the case of an uncoated paper surface.
• AGEPON wetting agent
• chrome alum as hardener
• EXAMPLE 2 The pigmented paper was coated with a 5 pm thick layer of silicic acid sol (K100, Wegriken Bayer) Y 3 with the addition of AGEPON as wetting agent. The depth of penetration of the dye solution was approximately equal to the thickness of the layer. The viewing density under reflected light was about l.2 for one colour.
• EXAMPLE 3 Gelatine and barium sulphate (ratio: 1:10) were mixed with water to form a spread coating suspension (temperature -50 to 60C). Hardener (chrome alum) were added to this supsension and in addition white toner and pigment dyes. were added to adjust the suspension to the optimum degree of whiteness. The suspension was then applied to the raw paper to produce a layer which has a thickness of pm when dry. The dye penetrated the layer to a depth of about 6 um. The viewing densities under reflected light were in the region of 1.1.
• EXAMPLE 4 The pigmented paper was first covered with a coating of polyethylene as gloss layer. .Over this, a layer of gelatine was cast as described in Example 1. Brilliant colours were obtained and the viewing density was increased to 1.3.
• Example 5 Before application of the ink-jet image, the layer prepared according to Example 3 was passed over a calendering press in which the rollers were heated to about C. A glazing effect was thereby obtained and the viewingdensities under reflected light were increased to 1.3 as in Example 3.
• a process for information recording comprising producing a fine jet of colored liquid, directing the jet of colored liquid onto a recording medium, modulating the density of the applied jet by an electric field in accordance with the information to be recorded, the improvement comprising the recording medium consisting of a support with an image-receiving layer, wherein the image-receiving layer is a molecular'or colloidal disperse substance, which is wetted by the colored liquid and into which the colored liquid penetrates to a depth in the order of a few microns.
• the image receiving layer comprises a protein, a polysaccharide, cellulose, a cellulose derivative, a polyvinyl alcohol, a copolymer of vinyl alcohols or a hydrophilic silica gel.
• a process according to claim 2 wherein the image receiving layer comprisesgelatin, albumen or casein.

Applications Claiming Priority (1)

Publications (1)

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Family Applications (1)

Country Status (4)

Cited By (39)

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Citations (9)

Family Cites Families (5)

• 1972
  • 1972-07-15 DE DE2234823A patent/DE2234823C3/de not_active Expired
• 1973
  • 1973-07-10 US US378014A patent/US3889270A/en not_active Expired - Lifetime
  • 1973-07-11 BE BE1005223A patent/BE802169A/xx not_active IP Right Cessation
  • 1973-07-13 GB GB3343673A patent/GB1426341A/en not_active Expired

Patent Citations (9)

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