EP0830257A1 - Recording sheet for use with pigment-based inks - Google Patents

Recording sheet for use with pigment-based inks

Info

Publication number
EP0830257A1
EP0830257A1 EP96916231A EP96916231A EP0830257A1 EP 0830257 A1 EP0830257 A1 EP 0830257A1 EP 96916231 A EP96916231 A EP 96916231A EP 96916231 A EP96916231 A EP 96916231A EP 0830257 A1 EP0830257 A1 EP 0830257A1
Authority
EP
European Patent Office
Prior art keywords
recording sheet
water soluble
substance
pigment
sheet according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96916231A
Other languages
German (de)
French (fr)
Other versions
EP0830257B1 (en
Inventor
James Christopher Body
Robert Graham Bracewell
Peter Kevin Owen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Rexam Coated Products Ltd
Original Assignee
Rexam Coated Products Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rexam Coated Products Ltd filed Critical Rexam Coated Products Ltd
Publication of EP0830257A1 publication Critical patent/EP0830257A1/en
Application granted granted Critical
Publication of EP0830257B1 publication Critical patent/EP0830257B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • B41M5/502—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording characterised by structural details, e.g. multilayer materials
    • B41M5/508—Supports
    • 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
    • B41M5/5245—Macromolecular coatings characterised by the use of polymers containing cationic or anionic groups, e.g. mordants
    • 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

  • the present invention relates to a recording sheet for use with printers and plotters employing pigment-based inks.
  • the invention relates to tracing papers for use with ink jet plotters and printers.
  • the invention is also applicable to other recording media, such as opaque papers, coated papers and plastics films, that are designed for use with printers and plotters employing pigment-based inks.
  • the invention also relates to opaque papers used for graphic arts applications.
  • the recording media are also compatible with other types of ink and other printers .
  • Natural tracing paper (as opposed to "prepared” tracing paper, also known as “vellum”) is manufactured from wood- based cellulose fibre pulp, which is mechanically treated, for example by crushing and chopping, to remove any air/fibre interfaces. This renders the paper material translucent.
  • the finished tracing paper is relatively dense and impervious compared with normal opaque papers .
  • Tracing papers have been used for many years for the preparation of engineering master drawings to be reproduced by the diazo process. Although manual drafting has largely been superseded by the use of CAD systems, tracing papers are still used for printing the master drawings .
  • Various types of plotter are ' used for printing the drawings, including pen plotters and electrostatic printers, but one of the most favoured types of plotter at present is the ink jet plotter.
  • Some ink jet print heads available at present use dye-based inks. These are satisfactory for most general purpose applications such as printing text and some graphic material, but lack the density and permanence of the pigmen -based inks that have traditionally been used in the preparation of engineering master drawings.
  • the lower density of the ink means that drawings printed using dye- based inks are not as well suited to the diazo process as those produced using pigment based inks.
  • an ink-jet print head that uses pigment- based inks has become available. This print head produces denser images than the previous dye-based ink print heads and the resulting drawings are better adapted to the diazo copying process. The images are also less liable to fading than images produced using dye-based inks .
  • a pigment-based ink for use with an ink jet print head typically comprises a dispersion of pigment particles, such as carbon black, suspended within an aqueous vehicle.
  • Other ingredients such as surfactants and stabilizers, are usually included to help maintain the dispersion, to prevent blocking of the ink jet nozzles and to promote vaporisation of the ink in the print head.
  • a binder such as shellac is not generally included as this can lead to blocking of the ink jet nozzles.
  • a recording sheet for use with pigment-based inks, wherein at least a usable surface of the recording sheet includes a combination of a water soluble cationic substance and water soluble binder substance.
  • the applicants have further found, however, that if the surface of the recording sheet is also treated with a water soluble or water-swellable binder, the resistance of the ink to abrasion is greatly increased. Therefore, by treating the recording sheet with a binder substance in combination with a cationic substance, migration can be largely prevented and the print quality and permanence of the printed sheet thereby improved.
  • the cationic substance may be a soluble polyvalent metal salt.
  • Suitable metal salts include the salts of metals from Groups II and III or the Transition Metals of the Periodic Table.
  • the metal salt is a salt of a cation selected from the group consisting of Mg 2+ , Ca 2+ , Al 3* , Zr 4+ and Zn + .
  • suitable metal salts include magnesium sulphate, calcium chloride, ammonium sulphate, zinc acetate, ammonium zirconium carbonate and magnesium acetate.
  • the cationic substance may be a cationic polymer, and is preferably a low molecular weight, high cationic charge density, water soluble organic polymer.
  • the polymer may be a polymeric amine (such as a quaternary amine or easily protonated tertiary amine) .
  • a suitable cationic substance is a solution in water of a poly-quaternary amine.
  • the binder substance may be selected from a group consisting of polyvinylpyrrolidone (PVP) , polyvinyl alcohol (PVOH) , carboxylated cellulosic polymers, polyacrylic acids, hydroxylated polyacrylates, polyacrylamides, starches (for example oxidised potato starch and potato starch ethers) and gelatine (compounded animal protein in water) .
  • PVP polyvinylpyrrolidone
  • PVH polyvinyl alcohol
  • carboxylated cellulosic polymers polyacrylic acids, hydroxylated polyacrylates, polyacrylamides, starches (for example oxidised potato starch and potato starch ethers) and gelatine (compounded animal protein in water) .
  • carboxylated cellulosic polymers examples include carboxyalkyl polymers and hydroxyalkyl polymers, and preferably hydroxymethyl cellulose and hydroxypropyl cellulose, and more preferably carboxymethylcellulose (CMC)
  • Suitable polyacrylic acids include those sold under the Trade Marks POLYMIN SK, PERCOL 1597 and PERCOL 1697.
  • polyvinyl alcohol may be used, including those having a low hydrolysis level and a high molecular weight, a low hydrolysis level and a low molecular weight, a high hydrolysis level ,• and a high molecular weight, or a high hydrolysis level and a low molecular weight .
  • the binder substance may have a molecular weight in the range 790,000 to 1,350,000 and a viscosity defined by a K-value of at least 30, and preferably at least 60, and advantageously approximately 90.
  • the cationic substance is magnesium sulphate and the binder is PVP.
  • the amount of magnesium sulphate applied to the surface of the recording sheet is preferably in the range 0.5-3.0gsm (g ⁇ f 2 ) , and more preferably 1.0-2.0gsm, and advantageously approximately 1.25-1.75gsm.
  • the amount of PVP applied to the surface of the recording sheet is preferably in the range 0.15-0.75gsm, and more preferably 0.4-0.7gsm, and is advantageously approximately 0.5gsm.
  • the invention is particularly applicable to natural tracing paper.
  • the invention may also be applied to opaque paper and card, synthetic paper, coated paper or card and plastics film.
  • a natural tracing paper wherein at least a usable surface of the paper includes a combination of a water soluble cationic substance and water soluble binder substance.
  • an uncoated, cellulose-based paper wherein at least a usable surface of the paper includes a combination of a water soluble cationic substance and water soluble binder substance.
  • a method of manufacturing a recording sheet for use with an ink jet plotter or printer wherein at least a usable surface of the recording sheet is treated with a combination of a water soluble cationic substance and water soluble binder substance.
  • the recording sheet is advantageously treated by applying a solution of the combination of substances to the usable surface of the sheet.
  • the solution is applied by drawing the semi-manufactured recording sheet through a bath of the solution.
  • the solution may be applied to the recording sheet by spraying or coating, either during or after completion of the manufacturing process .
  • a method of printing in which a pigment-based ink is applied to a recording sheet, wherein at least a usable surface of the recording sheet includes a combination of a water soluble cationic substance and water soluble binder substance.
  • the pigment-based ink is applied to the recording sheet by an ink jet plotter or printer.
  • the recording sheet is preferably a natural tracing paper.
  • an ink-jet recording sheet for ink-jet printing with pigment-based inks, wherein at least a usable surface of the recording sheet includes a combination of a water soluble cationic substance and water soluble binder substance.
  • a natural tracing paper for ink-jet printing with pigment-based inks wherein at least a usable surface of the tracing paper includes a combination of a water soluble cationic substance and water soluble binder substance.
  • the effect of applying various substances to natural tracing paper was tested by applying the substances as aqueous solutions to a base paper comprising a 90gsm waterleaf natural tracing paper.
  • the effectiveness of the substances in reducing migration was assessed visually and the substances were ranked according to the categories excellent, fair, mediocre and poor (in descending order) .
  • the effectiveness of the substances in binding the printed image to the paper was tested by visually assessing the results of an abrasion test and the substances ranked according to the same categories.
  • the results of the tests are summarised in the following table (Table 1) .

Landscapes

  • Paper (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)

Abstract

A recording sheet for use with pigment-based inks has a usable surface that includes a combination of a water soluble cationic substance and water soluble binder substance. The recording sheet may in particular be a natural tracing paper. The pigment-based ink is preferably applied to the recording sheet by an ink jet plotter or printer.

Description

RECORDING SHEET FOR USE WITH PIGMENT-BASED INKS
The present invention relates to a recording sheet for use with printers and plotters employing pigment-based inks. In particular, but not exclusively, the invention relates to tracing papers for use with ink jet plotters and printers. The invention is also applicable to other recording media, such as opaque papers, coated papers and plastics films, that are designed for use with printers and plotters employing pigment-based inks. For example, the invention also relates to opaque papers used for graphic arts applications. Preferably, the recording media are also compatible with other types of ink and other printers .
Natural tracing paper (as opposed to "prepared" tracing paper, also known as "vellum") is manufactured from wood- based cellulose fibre pulp, which is mechanically treated, for example by crushing and chopping, to remove any air/fibre interfaces. This renders the paper material translucent. The finished tracing paper is relatively dense and impervious compared with normal opaque papers .
Tracing papers have been used for many years for the preparation of engineering master drawings to be reproduced by the diazo process. Although manual drafting has largely been superseded by the use of CAD systems, tracing papers are still used for printing the master drawings . Various types of plotter are' used for printing the drawings, including pen plotters and electrostatic printers, but one of the most favoured types of plotter at present is the ink jet plotter.
Some ink jet print heads available at present use dye-based inks. These are satisfactory for most general purpose applications such as printing text and some graphic material, but lack the density and permanence of the pigmen -based inks that have traditionally been used in the preparation of engineering master drawings. The lower density of the ink means that drawings printed using dye- based inks are not as well suited to the diazo process as those produced using pigment based inks.
More recently, an ink-jet print head that uses pigment- based inks has become available. This print head produces denser images than the previous dye-based ink print heads and the resulting drawings are better adapted to the diazo copying process. The images are also less liable to fading than images produced using dye-based inks .
The development of the new ink jet print head has required the parallel development of new types of pigment-based ink. As the speed and definition of the print head has increased, the formulations of these new inks have been revised to provide the necessary performance.
A pigment-based ink for use with an ink jet print head typically comprises a dispersion of pigment particles, such as carbon black, suspended within an aqueous vehicle. Other ingredients, such as surfactants and stabilizers, are usually included to help maintain the dispersion, to prevent blocking of the ink jet nozzles and to promote vaporisation of the ink in the print head. However, unlike traditional pigment-based inks such as Indian ink, a binder such as shellac is not generally included as this can lead to blocking of the ink jet nozzles.
The applicants have identified a problem with existing tracing papers when used with ink jet print heads employing pigment-based inks. This is that when relatively large blocks or areas (i.e. areas larger than a few mm2) of high density are printed, the print can become rather uneven. For example, the print density may be reduced towards the edges of the area and stripes or patches of varying density may be produced. This phenomenon is sometimes referred to as "cascading". The variations in density are particularly noticeable by transmitted light and they can, therefore, be transferred to copies made by the diazo process. The effect is not generally particularly noticeable by reflected light or in areas of text or fine details.
The applicants have observed that the above-mentioned problem occurs when the ink droplets fall onto the paper in such a concentration that they coalesce to form a pool of liquid ink on the surface of the paper. The applicants have discovered that when this happens, the pigment particles migrate towards one another within the pool of liquid, thereby forming areas of increased density and leaving areas of reduced density.
A similar problem has been observed with colour print heads that use pigment-based black ink and dye-based coloured inks. Where an area of pigment-based ink touches an area of dye-based ink, the border between the two inks becomes scalloped with the coloured dye-based inks intruding into the black area. The applicants have discovered that this effect is caused by migration of the pigment particles away from the area of dye-based ink.
It is an object of the invention to provide a recording sheet that mitigates at least some of the above-mentioned problems.
According to a first aspect of the invention there is provided a recording sheet for use with pigment-based inks, wherein at least a usable surface of the recording sheet includes a combination of a water soluble cationic substance and water soluble binder substance.
In experiments involving the application of various surface treatments to the recording sheet, the applicants found that by treating the surface of the sheet with a water soluble cationic substance, the suspension of pigment particles could be destabilized as the ink droplets hit the surface, giving good print quality. However, abrasion resistance of the print was unsatisfactory. The printed documents did not, therefore, have the longevity required of them. The applicants discovered that this was because the pigment particles tended to sit on the surface of the paper, where they were exposed to abrasive forces, rather than being drawn into the structure of the paper.
The applicants have further found, however, that if the surface of the recording sheet is also treated with a water soluble or water-swellable binder, the resistance of the ink to abrasion is greatly increased. Therefore, by treating the recording sheet with a binder substance in combination with a cationic substance, migration can be largely prevented and the print quality and permanence of the printed sheet thereby improved.
The cationic substance may be a soluble polyvalent metal salt. Suitable metal salts include the salts of metals from Groups II and III or the Transition Metals of the Periodic Table. Preferably, the metal salt is a salt of a cation selected from the group consisting of Mg2+, Ca2+, Al3*, Zr4+ and Zn+. Examples of suitable metal salts include magnesium sulphate, calcium chloride, ammonium sulphate, zinc acetate, ammonium zirconium carbonate and magnesium acetate.
Alternatively, the cationic substance may be a cationic polymer, and is preferably a low molecular weight, high cationic charge density, water soluble organic polymer. For example, the polymer may be a polymeric amine (such as a quaternary amine or easily protonated tertiary amine) . A suitable cationic substance is a solution in water of a poly-quaternary amine.
The binder substance may be selected from a group consisting of polyvinylpyrrolidone (PVP) , polyvinyl alcohol (PVOH) , carboxylated cellulosic polymers, polyacrylic acids, hydroxylated polyacrylates, polyacrylamides, starches (for example oxidised potato starch and potato starch ethers) and gelatine (compounded animal protein in water) .
Examples of suitable carboxylated cellulosic polymers include carboxyalkyl polymers and hydroxyalkyl polymers, and preferably hydroxymethyl cellulose and hydroxypropyl cellulose, and more preferably carboxymethylcellulose (CMC)
(especially low molecular weight carboxymethylcellulose) .
Examples of suitable polyacrylic acids include those sold under the Trade Marks POLYMIN SK, PERCOL 1597 and PERCOL 1697.
Various types of polyvinyl alcohol (PVOH) may be used, including those having a low hydrolysis level and a high molecular weight, a low hydrolysis level and a low molecular weight, a high hydrolysis level ,• and a high molecular weight, or a high hydrolysis level and a low molecular weight . The binder substance may have a molecular weight in the range 790,000 to 1,350,000 and a viscosity defined by a K-value of at least 30, and preferably at least 60, and advantageously approximately 90.
In a particularly preferred embodiment of the invention, the cationic substance is magnesium sulphate and the binder is PVP. The amount of magnesium sulphate applied to the surface of the recording sheet is preferably in the range 0.5-3.0gsm (gπf2) , and more preferably 1.0-2.0gsm, and advantageously approximately 1.25-1.75gsm. The amount of PVP applied to the surface of the recording sheet is preferably in the range 0.15-0.75gsm, and more preferably 0.4-0.7gsm, and is advantageously approximately 0.5gsm. The invention is particularly applicable to natural tracing paper. The invention may also be applied to opaque paper and card, synthetic paper, coated paper or card and plastics film.
According to a second aspect of the invention, there is provided a natural tracing paper, wherein at least a usable surface of the paper includes a combination of a water soluble cationic substance and water soluble binder substance.
According to a third aspect of the invention, there is provided an uncoated, cellulose-based paper, wherein at least a usable surface of the paper includes a combination of a water soluble cationic substance and water soluble binder substance.
According to a fourth aspect of the invention, there is provided a method of manufacturing a recording sheet for use with an ink jet plotter or printer, wherein at least a usable surface of the recording sheet is treated with a combination of a water soluble cationic substance and water soluble binder substance.
The recording sheet is advantageously treated by applying a solution of the combination of substances to the usable surface of the sheet. Preferably, the solution is applied by drawing the semi-manufactured recording sheet through a bath of the solution. Alternatively, the solution may be applied to the recording sheet by spraying or coating, either during or after completion of the manufacturing process .
According to a fifth aspect of the invention, there is provided a method of printing in which a pigment-based ink is applied to a recording sheet, wherein at least a usable surface of the recording sheet includes a combination of a water soluble cationic substance and water soluble binder substance.
Preferably, the pigment-based ink is applied to the recording sheet by an ink jet plotter or printer. The recording sheet is preferably a natural tracing paper.
According to a sixth aspect of the invention, there is provided an ink-jet recording sheet for ink-jet printing with pigment-based inks, wherein at least a usable surface of the recording sheet includes a combination of a water soluble cationic substance and water soluble binder substance.
According to a seventh aspect of the invention, there is provided a natural tracing paper for ink-jet printing with pigment-based inks, wherein at least a usable surface of the tracing paper includes a combination of a water soluble cationic substance and water soluble binder substance.
Various embodiments of the invention will now be described by way of the following examples, in which all parts and percentages are by weight unless otherwise stated.
Examples
The effect of applying various substances to natural tracing paper was tested by applying the substances as aqueous solutions to a base paper comprising a 90gsm waterleaf natural tracing paper. The effectiveness of the substances in reducing migration was assessed visually and the substances were ranked according to the categories excellent, fair, mediocre and poor (in descending order) . The effectiveness of the substances in binding the printed image to the paper was tested by visually assessing the results of an abrasion test and the substances ranked according to the same categories. The results of the tests are summarised in the following table (Table 1) .
The tests revealed that whilst treating the surface of the paper with a cationic substance alone helps to reduce migration, this leads to poor resistance to abrasion. In order to provide good abrasion resistance as well as reduced migration, a binder must be applied in addition to the cationic substance. It was found that an aqueous solution comprising a blend of magnesium sulphate and high viscosity PVP produced excellent results, both for reducing migration and providing good resistance to abrasion.
Table 1: Test results
Solution content Class Blend Applied Binding, Migration weight rating rating
Aluminium sulphate Cation no 8.0 gsm poor excellent
1 .1 gsm poor fair
Calcium chloride Cation no 1 .1 gsm poor good 8.9 gsm poor excellent
Magnesium sulphate Cation no 1 .0 gsm poor good 8.5 gsm poor excellent
Polymeric quaternary Cation no 1 .0 gsm poor fair amine 1 1 , 1 gsm poor fair
Oxidised potato starch Binder no 5.9 gsm fair poor 1 .2 gsm poor poor
Potato starch ethers Binder no 1 .5 gsm poor poor
3.6 gsm fair poor
Polyvinyl alcohol Binder no 1 .0 gsm fair poor
(High hydrolysis, 2.3 gsm fair poor
Low mol wt)
Polyvinyl alcohol Binder no 1 .0 gsm excellent poor
(Low hydrolysis, 2.3 gsm excellent poor
Low mol wt)
Polyvinyl alcohol Binder no 0.4 gsm excellent poor
(High hydrolysis, 0.8 gsm excellent poor
High mol wt)
Polyvinyl alcohol Binder no 0.4 gsm mediocre poor
(Low hydrolysis, 1 .3 gsm mediocre poor
High mol wt)
Low viscosity PVP Binder no 0.1 gsm excellent poor 0.5 gsm excellent poor
Low viscosity CMC Binder no 0.4 gsm fair poor 0.1 gsm fair poor
High viscosity PVP Binder yes 0.2 gsm excellent excellent
Magnesium sulphate Cation 1 .0 gsm excellent excellent
High viscosity PVP Binder yes 0.1 gsm excellent excellent
Magnesium sulphate Cation 0.9 gsm excellent excellent
-

Claims

1. A recording sheet for use with pigment-based inks, wherein at least a usable surface of the recording sheet includes a combination of a water soluble cationic substance and water soluble binder substance .
2. A recording sheet according to claim 1, wherein the cationic substance is a soluble polyvalent metal salt.
3. A recording sheet according to claim 2 , wherein the cationic substance is a salt of a metal from Groups II and III or the Transition Metals of the Periodic Table.
4. A recording sheet according to claim 3 , wherein the cationic substance is a salt of a cation selected from the group consisting of Mg2+, Ca2+, Al3+, Zr4+ and Zn2+.
5. A recording sheet according to claim 4, wherein the cationic substance is magnesium sulphate.
6. A recording sheet according to claim 5 , wherein the amount of magnesium sulphate applied to the surface of the recording sheet is in the range 0.5-3.0gsm, and preferably 1.0-2.0gsm, and advantageously approximately 1.25-1.75gsm.
7. A recording sheet according to claim 1, wherein the cationic substance is a cationic polymer.
8. A recording sheet according to claim 7, wherein the cationic substance is a poly-quaternary amine.
9. A recording sheet according to any one of the preceding claims, wherein the binder substance is selected from a group consisting of polyvinylpyrrolidone, polyvinyl alcohol, carboxylated cellulosic polymers, polyacrylic acids, hydroxylated polyacrylateε, polyacrylamides, starches and gelatine.
10. A recording sheet according to claim 9, wherein the binder substance is selected from a group consisting of carboxyalkyl polymers and hydroxyalkyl polymers, and preferably hydroxymethyl cellulose and hydroxypropyl cellulose, and is more preferably carboxymethyl cellulose.
11. A recording sheet according to claim 9 or claim 10, wherein the binder substance has a molecular weight in the range 790,000 to 1,350,000.
12. A recording sheet according to claim 9, wherein the binder substance is polyvinylpyrrolidone having a viscosity defined by a K-value of at least 30, and preferably at least 60 and advantageously approximately 90.
13. A recording sheet according to claim 12, wherein the amount of PVP applied to the surface of the recording sheet 'is in the range 0.15-0.75gsm, and preferably 0.4-0.7gsm, and is advantageously approximately 0.5gsm.
14. A recording sheet according to any one of the preceding claims, in which the substances are applied to the surface of the recording sheet as an aqueous solution.
15. A recording sheet according to any one of the preceding claims, in which the recording sheet is a natural tracing paper.
16. A natural tracing paper, wherein at least a usable surface of the paper includes a combination of a water soluble cationic substance and water soluble binder substance .
17. An uncoated, cellulose-based paper, wherein at least a usable surface of the paper includes a combination cf a water soluble cationic substance and water soluble binder substance .
18. A method of manufacturing a recording sheet for use with an ink jet plotter or printer, wherein at least a usable surface of the recording sheet is treated with a combination of a water soluble cationic substance and water soluble binder substance.
19. A method according to claim 18, wherein the recording sheet is treated by applying an aqueous solution of the combination of substances to the usable surface of the sheet .
20. A method according to claim 19, wherein the solution is applied by drawing the semi-manufactured recording sheet through a bath of the solution.
21. A method of printing, in which a pigment-based ink is applied to a recording sheet, wherein at least a usable surface of the recording sheet includes a combination of a water soluble cationic substance and water soluble binder substance.
22. A method according to claim 21, wherein the pigment- based ink is applied to the recording sheet by an ink jet plotter or printer.
23. A method according to claim 21 or claim 22, wherein the recording sheet is a natural tracing paper.
24. An ink-jet recording sheet for ink-jet printing with pigment-based inks, wherein at least a usable surface of the recording sheet includes a combination of a water soluble cationic substance and water soluble binder substance.
25. A natural tracing paper for ink-jet printing with pigment-based inks, wherein at least a usable surface of the tracing paper includes a combination of a water soluble cationic substance and water soluble binder substance.
EP96916231A 1995-06-06 1996-06-04 Natural tracing paper for use with pigment-based inks. Expired - Lifetime EP0830257B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9511363 1995-06-06
GB9511363A GB2301845B (en) 1995-06-06 1995-06-06 Natural tracing paper for use with pigment-based inks
PCT/GB1996/001326 WO1996039304A1 (en) 1995-06-06 1996-06-04 Recording sheet for use with pigment-based inks

Publications (2)

Publication Number Publication Date
EP0830257A1 true EP0830257A1 (en) 1998-03-25
EP0830257B1 EP0830257B1 (en) 1999-04-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96916231A Expired - Lifetime EP0830257B1 (en) 1995-06-06 1996-06-04 Natural tracing paper for use with pigment-based inks.

Country Status (5)

Country Link
EP (1) EP0830257B1 (en)
DE (1) DE69602187T2 (en)
ES (1) ES2130822T3 (en)
GB (1) GB2301845B (en)
WO (1) WO1996039304A1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2346157A (en) * 1999-01-28 2000-08-02 Rexam Coated Products Limited Surface-treated paper for use as recording medium
GB2349134A (en) * 1999-04-24 2000-10-25 Rexam Coated Products Limited Label sheet assembly
IT1309923B1 (en) 1999-09-03 2002-02-05 Ferrania Spa RECEPTOR SHEET FOR INK JET PRINT INCLUDING GELATINE AND A METAL SALT.
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DE69602187T2 (en) 1999-11-11
GB9511363D0 (en) 1995-08-02
WO1996039304A1 (en) 1996-12-12
ES2130822T3 (en) 1999-07-01
EP0830257B1 (en) 1999-04-21
DE69602187D1 (en) 1999-05-27
GB2301845B (en) 1998-08-19
GB2301845A (en) 1996-12-18

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