EP0816928B1 - Image de révelateur résitent à la fêlure - Google Patents

Image de révelateur résitent à la fêlure Download PDF

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Publication number
EP0816928B1
EP0816928B1 EP19970201978 EP97201978A EP0816928B1 EP 0816928 B1 EP0816928 B1 EP 0816928B1 EP 19970201978 EP19970201978 EP 19970201978 EP 97201978 A EP97201978 A EP 97201978A EP 0816928 B1 EP0816928 B1 EP 0816928B1
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EP
European Patent Office
Prior art keywords
toner
image
toner particles
plasticizer
groups
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EP19970201978
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German (de)
English (en)
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EP0816928A2 (fr
EP0816928A3 (fr
Inventor
Serge Tavernier
Stefaan De Meutter
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Xeikon NV
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Xeikon NV
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Publication of EP0816928A3 publication Critical patent/EP0816928A3/fr
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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G11/00—Selection of substances for use as fixing agents
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G8/00—Layers covering the final reproduction, e.g. for protecting, for writing thereon
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G9/00—Developers
    • G03G9/08—Developers with toner particles
    • G03G9/087—Binders for toner particles
    • G03G9/08784—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775
    • G03G9/08791—Macromolecular material not specially provided for in a single one of groups G03G9/08702 - G03G9/08775 characterised by the presence of specified groups or side chains

Definitions

  • This invention relates to an electrostatographic imaging method.
  • this invention relates to a method to improve the mechanical properties of fixed toner images comprising several superimposed toner layers.
  • Electrostatic printing methods are manifold, e.g. Direct Electrostatic Printing, wherein electrostatic printing is performed directly from a toner delivery means on a receiving substrate, the latter not bearing any imagewise latent electrostatic image, by means of an electronically addressable printhead structure.
  • electrostatic printing toner images are made on an image-forming element in the form of a rotating drum provided with an electrostatic layer built up from a number of controllable electrodes in and beneath a dielectric layer.
  • the voltage that is image-wise applied to said controllable electrodes attracts charged toner particles from a toner source.
  • an electrostatic latent image is formed by the steps of uniformly charging a photoconductive member and imagewise discharging it by an imagewise modulated photo-exposure.
  • an electrostatic latent image is formed by imagewise depositing electrically charged particles, e.g. from electron beam or ionized gas onto a dielectric substrate.
  • the obtained latent images are developed, i.e. converted into visible images by selectively depositing thereon light absorbing particles, called toner particles, which usually are triboelectrically charged.
  • a latent magnetic image is formed in a magnetizable substrate by a pattern wise modulated magnetic field.
  • the magnetizable substrate must accept and hold the magnetic field pattern required for toner development which proceeds with magnetically attractable toner particles.
  • dry development the application of dry toner powder to the substrate carrying the latent electrostatic image may be carried out by different methods known as, “cascade”, “magnetic brush”, “powder cloud”, “impression” or “transfer” development also known as “touchdown” development described e.g. by Thomas L. Thourson in IEEE Transactions on Electronic Devices, Vol. ED-19, No. 4, April 1972, pp.495-511.
  • the toning developer is directly, image wise deposited on a final substrate to form a visible image.
  • a latent image, electrostatic or magnetographic is developed to form a visible image. This visible image is then transferred, either directly or via an intermediate transfer medium, to a final substrate.
  • the visible image of electrostatically or magnetically attracted toner particles, on the final substrate is not permanent and has to be fixed by causing the toner particles to adhere to each other and the substrate by softening or fusing them followed by cooling. Normally fixing proceeds on more or less porous paper by causing or forcing the softened or fused toner mass to penetrate into the surface irregularities of the paper.
  • Dry-development toners essentially comprise a thermoplastic binder consisting of a thermoplastic resin or mixture of resins (ref. e.g. US-P 4,271,249) including colouring matter, e.g. carbon black or finely dispersed dye pigments or soluble dyes.
  • the triboelectrically chargeability is defined by said substances and may, optionally, be modified with a charge controlling agent.
  • the toner image fixed to a substrate is vulnerable and especially full colour images or black and white images wherein the tonal range is extended by the use of toner particles comprising different amounts of black pigment, are easily cracked upon bending of the substrate bearing the image.
  • This susceptibility to cracking of these images is due to the fact that in such images various layers of fused toner particles are superimposed and that such a relatively thick layer of fused toner particles is quite brittle.
  • the number of superimposed toner layers depends on the colour hue or to the grey density that has to be reproduced. It has been disclosed to apply a layer of colourless toner particles on top of the four colour toner image to protect the image and at the same time equalize the gloss of the image.
  • the objects of the invention are realized by providing a toner image fixed on a substrate wherein said toner image comprises a plurality of different types of fused toner particles and on top of it a non-image wise applied layer containing a plasticiser, said plasticiser being present in an amount between 0.01 g/m 2 and 10 g/m 2 characterised in that at least one of said different types of toner particles contains a toner resin having reactive groups (A) and said plasticizer carries reactive groups (B) and reactive groups A and B are chosen such that they can react together forming a chemical bond between said fused toner particles and said plasticizer.
  • said reactive groups are a member selected from the group consisting of epoxy groups, amino groups, mercapto groups, hydroxyl groups and carboxyl groups.
  • plasticizer is present in an amount between 0.1 g/m 2 and 7 g/m 2 .
  • said toner image comprises, on top of said plurality of fused different types of toner particles, a fused toner layer as clear finish layer and said plasticizer is present on top of said clear finish layer.
  • Toner images fixed to a substrate, often comprise a plurality of toner layers superimposed on each other. This is especially so in full colour images were different colours and hues are realized by the superposition of yellow, magenta, cyan and black (YMCK) toners.
  • the yellow parts are e.g. made up by one layer of toner particles and the black parts, e.g., by the superposition of four layers of toner particles.
  • EP-A 768 577 it is disclosed to extend the grey scale (tonal range) in a black and white electrostatographic image fixed to a substrate, by realizing the necessary different shades of grey with the superposition of toner particles comprising different amounts of black pigment.
  • Toner images fixed on a substrate and comprising various toner layers in superposition or comprising image parts made up with toner particles in an amount higher 5 g/m 2 of toner are quite brittle and sensitive to cracking when the substrate carrying the image is bent.
  • plasticizer is used to encompass both a single plasticizing compound, a mixture of plasticizing compounds, a solution of one or more plasticizing compounds in a solvent, etc.
  • a finish layer, applied on top of fused image-forming toner layers, is preferably formed by depositing, on top of the toner particles forming the image, a layer of toner particles having a lower meltviscosity than pigmented toner particles forming the image.
  • This provision entails that the meltviscosity of the clear toner particles forming the clear finish layer is between 50 and 2000 Pas, preferably between 100 and 1000 Pas. All meltviscosities mentioned herein are measured in a RHEOMETRICS dynamic rheometer, RVEM-200 (One Possumtown Road, Piscataway, NJ 08854 USA).
  • the viscosity measurement is carried out at a sample temperature of 120 °C.
  • the sample having a weight of 0.75 g is applied in the measuring gap (about 1.5 mm) between two parallel plates of 20 mm diameter one of which is oscillating about its vertical axis at 100 rad/sec and amplitude of 10 -3 radians. Due to the lower meltviscosity, said toner particles forming the finish layer partially interpenetrate, during the fixing process, easily with the toner particles forming the image. Due to this partial interpenetration an even and uninterrupted finish layer is provided.
  • the clear finish layer can applied in such a way that the surface relief is equalized, therefore it is applied "counter image-wise", such that a thicker fixed clear finish layer is present in the lower thickness areas of the image and a thinner fixed clear finish layer is present in the higher thickness areas of the image.
  • the application of a finish layer on top of a toner image presents several advantage, e.g. reduction of the scratchability, gloss equalization, etc.
  • the total number of toner layers on the substrate is increased and thus also the brittleness and the susceptibility to cracking of the image. Therefore the non-imagewise application of a layer comprising a plasticizer is highly beneficial in images comprising a clear finish layer.
  • the application of a layer comprising a plasticizer on top of a toner image is more advantageous to reduce the brittleness of a toner image than to produce the image with toner particles incorporating plasticizers.
  • the incorporation of plasticizers in the bulk of toner particles tends to lower the Tg of the toner particles (essentially the Tg of the toner resin(s) making up the largest part by weight of the toner particles).
  • the lowering of the Tg entails a lowering of the mechanical strength of the toner particles at room temperature and thus toner particles incorporating a plasticizer will be more prone to toner impactation, agglomeration, etc, by the mechanical force exerted on said particles during development and in the toner addition devices.
  • the plasticizer can be any compound know in the art as plasticizer for plastic materials. It can also be waxes both natural and synthetic. Very useful plasticizers, for realizing the objects of the present invention, are both very low viscosity plasticizers and polymeric plasticizers that are liquid at room temperature. When using low viscosity plasticizers (i.e. plasticizers with a viscosity ( ⁇ ) lower than 50 mPas), it is preferred to use plasticizers with a boiling point higher than 180 °C These low viscosity plasticizers can be used alone or a mixture of low viscosity plasticizers can be used.
  • plasticizers When using polymeric plasticizers (a single compound or a mixture of polymeric plasticizers), that are liquid at room temperature, it is preferred that these plasticizers have a viscosity at 25 °C between 200 and 20,000 mPas.
  • Typical examples of useful plasticizers are given in table 1. It is possible within the scope of the present invention to use a mixture of low viscosity ( ⁇ ⁇ 50 mPas) plasticizers and higher viscosity (200 mPas ⁇ ⁇ ⁇ 20,000 mPas) plasticizers.
  • the plasticizers useful in this invention can thus be mixtures having a ratio of low viscosity to high viscosity plasticizer between 100:0 and 0:100.
  • Preferred plasticizer are compounds that can diffuse in the toner layers after application of the compound. Preferred are plasticizers that can readily diffuse in to the toner layers at room temperature, but also compounds that diffuse under the influence of a higher temperature are very useful in this invention. When using a plasticizer that diffuses in to the toner layers under influence of an elevated temperature it is preferred to apply the plasticizer to the toner layers before heat fixing (both in a non-contact and in hot pressure fixing) the toner layers, e.g. by spraying.
  • the plasticizer has to last as long as possible, and therefore it is preferred that the plasticizer does not re-diffuse out of the image after a period of time. Therefore it is preferred in this invention, that at least one of said different types of toner particles comprises a toner resin containing reactive groups (A) and said plasticizer comprises reactive groups (B) and reactive groups A and B are chosen such that they can react together forming a chemical bond between said fused toner particles and said plasticizer.
  • said clear toner particles forming said finish layer comprise preferably a toner resin containing reactive groups (A) and said plasticizer comprises reactive groups (B) and reactive groups A and B are chosen such that they can react together forming a chemical bond between said fused toner particles and said plasticizer.
  • Said reactive groups are preferably members selected from the group consisting of epoxy groups, amino groups, mercapto groups, hydroxyl groups and carboxyl groups.
  • Resins, for use as toner in toner particles according to the present invention, comprising reactive groups A can be homopolymers as well as copolymers.
  • Typical examples are e.g. polymers (polycondensation polymers or addition polymers) having an acid or hydroxyl value ⁇ 2.5 KOH/g.
  • Preferably said polycondensation polymers are polyesters and said addition polymers comprise moieties carrying carboxyl groups (e.g. addition polymers comprising acrylic acid moieties).
  • Typical examples of very useful polymers for toner resins used in toner particles according to this invention are tabulated in table 2.
  • the glass transition temperature Tg in °C is given together with their number-average molecular weight (Mn) and weight-average molecular weight (Mw).
  • Mn and Mw values have to be multiplied by 10 3 .
  • the resins containing free carboxylic acid groups and or hydroxyl groups are characterized by their total acid value (AV) or Hydroxyl value (HV) both expressed in mg KOH per g resin.
  • epoxy resins linear adducts of bisphenol compounds and epichlorhydrin as described e.g. by D. H. Solomon in the book “The Chemistry of Organic Film Formers” - John Wiley & Sons, Inc, New York (1967) p. 180-181,) e.g. EPIKOTE 1004 (EPIKOTE is a registered trade mark of the Shell Chemical Co.), polyamides, copolymers of polyester and polyamides, etc.
  • the plasticizer comprising reactive groups B can be a monomeric plasticizer (e.g. an epoxy stearate, an epoxy hydrophathalate, hydrophathalates, hydroisophthalates, etc) or a polymeric plasticizer (e.g. liquid epoxy resins as mentioned in table 1).
  • a monomeric plasticizer e.g. an epoxy stearate, an epoxy hydrophathalate, hydrophathalates, hydroisophthalates, etc
  • a polymeric plasticizer e.g. liquid epoxy resins as mentioned in table 1.
  • this plasticizer has a viscosity at 25 °C between 200 and 20,000 mPas.
  • the plasticizer is a liquid epoxy resin and the toner particles comprise a toner resin wherein at least 25 % by weight of a polyester, having an acid or hydroxyl value ⁇ 2.5 mg KOH/g, is present.
  • the plasticizer can be applied to the surface of the toner images either in pure form or from a solution or dispersion in an organic solvent or in water.
  • the application in pure form or from a solution or dispersion in water is preferred.
  • the invention also encompasses a method for producing a toner image on a substrate comprising, in any order, the steps of :
  • the plasticizer can also be applied on toner images, covered or not with a layer of clear toner particles, before fixing said toner particles and said toner particles are fixed after application of said plasticizer.
  • the fixing step in the method described above can beneficially comprise a non-contact fusing step.
  • the methods, outlined above, are especially suited for the production of full colour images and black and white images wherein the different shades of grey are realized by the superposition of toner particles comprising different amounts of black pigment.
  • a typical apparatus for producing toner images according to the invention comprises, in consecutive order :
  • An apparatus can also comprise, between said means for image wise depositing a plurality of layers of different types of toner particles on a substrate and means for fixing said toner image, means for applying a layer of clear toner particles, covering the previously applied layers.
  • An apparatus wherein said means for applying said plasticizer precede said means for fixing said toner image, is within the scope of the present invention.
  • An apparatus according to this invention and described immediately above, comprises beneficially means for non-contact fusing said toner particles.
  • Said means for applying said plasticizer can be rollers, wicks, sprays, etc.
  • said means for applying plasticizer are rollers, it may be split rollers, e.g. when 10 g/m 2 of plasticizer has to be applied, there may be provided four application rollers, the first two applying together 7.5 g/m 2 of plasticizer and the following rollers applying the remaining 2.5 g/m 2 .
  • Preferred means for applying said plasticizers are supply rollers with a surface in NOMEX-felt (NOMEX is a trade name of Du Pont de Nemours, Wilmington, US) as described in article titled "Innovative Release Agent Delivery Systems" by R. Bucher et al.
  • plasticizers can be delivered to the image directly by supply rollers as described above, or over an intermediate roller, which distributes the oil even more evenly over the image.
  • the fixed image i.e. the fused toner particles
  • the pressure roller exerts preferably a pressure, per linear nip-length, on the fixed image of between 100 N/m and 500 N/m, and the post-treatment proceeds for a time preferably between 30 and 150 msec.
  • two modes of operating said post-treatment Said two modes differ in the temperature of said post-treatment.
  • fused image is passed through rollers said rollers having a temperature between 20 °C below and 20 °C above the softening temperature of the toner resin, which means in most cases a temperature of around 120 °C.
  • the fused image is directly, without allowing it to cool, passed from the fusing station through a rollers, where essentially no additional heat is added to the fixed image, but where the temperature of the post-treatment rollers is kept between 5 °C below and 15 °C above the Tg of the toner resin.
  • releasing agents e.g. silicon oil, fluid waxes, etc, on the surface of the post-treatment rollers.
  • the terms “scratchability” and “scratches” refer both to mechanically scratches such that the toner particles are detached from or smeared over the substrate, and to scratches that are only visible under some angles of illumination. It may therefore be beneficial to apply not only a plasticizer to a toner image according to the present invention, but also an abhesive compound as described in European Application 96201373.6, filed on May 21, 1996, that is incorporated herein by reference.
  • Such an abhesive compound is preferably present in an amount between 3.0 mg/m 2 and 300 mg/m 2 and has a viscosity at 25 °C between 50 and 50,000 mPas.
  • said abhesive compound is a silicone oil.
  • the present invention can be practised on toner images that are formed with any electrographic or magnetographic imaging method and with any type of toner particles known in the art.
  • the toner particles can be magnetic or non-magnetic.
  • the developer used to form the image can be mono-component magnetic developer, a non-magnetic mono-component developer, a multi-component developer comprising non-magnetic toner particles and magnetic carrier particles.
  • the toner particles, used to form a toner image according to the present invention can comprise any known toner resin or mixtures thereof.
  • the toner resin can be a polycondensation polymer or a mixture of different polycondensation polymers as well as an addition polymer or a mixture of addition polymers. Also mixtures of polycondensation polymers and addition polymers are suitable as toner resin for toner particles according to the present invention.
  • polyesters are preferred. Polyester resins suitable for use in toner particles according to the present invention are selected e.g. from the group of linear polycondensation products of (i) di-functional organic acids, e.g.
  • di-functional alcohols such as ethylene glycol, triethylene glycol, an aromatic dihydroxy compound, preferably a bisphenol such as 2,2-bis(4-hydroxyphenyl)-propane called "Bisphenol A” or an alkoxylated bisphenol, e.g. propoxylated bisphenol examples of which are given in US-P 4,331,755.
  • a bisphenol such as 2,2-bis(4-hydroxyphenyl)-propane called "Bisphenol A”
  • an alkoxylated bisphenol e.g. propoxylated bisphenol examples of which are given in US-P 4,331,755.
  • suitable polyester resins reference is made to GB-P 1,373,220.
  • styrene/acrylic resins it is preferred to use styrene/acrylic resins.
  • Preferred styrene-acrylic resins have a relatively high (more than 70 mol %) styrene content, and are more particularly copolymers of styrene-acrylic resins or styrene-methacrylic resins, e.g. copoly(styrene/n-butylmethacrylate) or copoly(styrene/2-ethyl-hexylacrylate).
  • mixtures of polycondensation resins, or mixtures of addition polymers or mixtures of polycondensation polymers and addition polymers can be useful in the preparation of toner particles according to the present invention.
  • Very useful mixtures of polymers for use as toner resin according to the present invention have been disclosed in EP-A 656 129.
  • Toner particles comprising mixtures of polymers as toner resin are preferably toner particles comprising a toner resin, wherein :
  • Polyester P5 is an aromatic polyester resin derived from terephthalic acid (100 mol %) as aromatic diacid and a mixture of DIANOL 33 (50 mol %) and ethylene glycol (50 mol %) as diols.
  • Polyester P6 is an aromatic polyester resin derived from terephthalic acid (64 mol %), isophthalic acid (36 mol %) as aromatic di-acids and ethylene glycol (100 mol %).
  • Styr/acryl S4 is a copolymer of styrene and methyl acrylate in a 65/35 molar ratio.
  • Styr/acryl S5 is a terpolymer of styrene, methyl acrylate and dimethylaminoethyl methacrylate in a 87/3/10 molar ratio.
  • Styr/acryl S6, S7, S8 and S9 are a copolymer of styrene and methyl acrylate in a 80/20 molar ratio, only differing in molecular weight.
  • the toner particles can comprise any normal toner ingredient e.g. charge control agents, pigments both coloured and black, dyes, release agents, resistivity regulating agents, anorganic fillers, etc.
  • charge control agents, pigments and other additives useful in toner particles, to be used in a toner composition according to the present invention can be found in e.g. EP-A 601 235.
  • polyester P2 (acid value AV of 17 mg KOH/g)of Table 2 and 49 parts of polyester P3 ( AV of 18 mg KOH/g) of Table 2 were melt-blended for 30 minutes at 110 °C in a laboratory kneader with 2 parts of SICOECHTGELB D 1355 DD (Colour Index PY 13, trade name of BASF AG, Germany).
  • the solidified mass was pulverized and milled using an ALPINE Fliessbettarnastrahlmühle type 100AFG (tradename) and further classified using an ALPINE multiplex zig-zag classifier type 100MZR (tradename).
  • the average particle size of the separated toner was measured by Coulter Counter model Multisizer (tradename) was found to be 8.0 ⁇ m by volume.
  • the toner particles were mixed with 0.5 % of hydrophobic colloidal silica particles (BET-value 130 m 2 /g).
  • the preparation of the Yellow toner was repeated, but instead of 2 parts SICOECHTGELB PY13, 2 parts of CABOT REGAL 400 (carbon black, trade name of the Cabot Corp. High Street 125, Boston, U.S.A.) were used.
  • the four toners, Y, M, C and K had a meltviscosity at 120 ° C of 500 Pas.
  • polyester P2 (AV 17 g KOH/g) of Table 2 were melt-blended for 30 minutes at 110 °C in a laboratory kneader.
  • the solidified mass was pulverized and milled using an ALPINE Fliessbettarnastrahlmühle type 100AFG (tradename) and further classified using an ALPINE multiplex zig-zag classifier type 100MZR (tradename).
  • the average particle size of the separated toner was measured by Coulter Counter model Multisizer (tradename) was found to be 8.0 ⁇ m by volume.
  • the clear toner CLT1 had a meltviscosity at 120 °C of 150 Pas.
  • the toner particles were mixed with 0.5 % of hydrophobic colloidal silica particles (BET-value 130 m 2 /g).
  • the preparation of clear toner 1 was repeated, but instead of 100 parts of polyester P2 of Table 2, 100 parts of polyester P3 (AV of 18 g KOH/g) of table 2 were used.
  • the clear toner CLT2 had a meltviscosity at 120 °C of 600 Pas.
  • the preparation of clear toner 1 was repeated, but instead of 100 parts of polyester P2 of Table 2, 100 parts of an epoxy resin EPIKOTE 1004 (trade mark of the Shell Chemical Co) were used.
  • the clear toner CLT3 had a meltviscosity at 120 °C of 80 Pas.
  • Each of the above prepared toners were used to form carrier-toner developers by mixing said mixture of toner particles and colloidal silica in a 4 % ratio with silicone-coated Cu-Zn ferrite carrier particles having an average diameter of 55 ⁇ m.
  • Full colour toner images were produced using a commercial CHROMAPRESS (a trade name of Agfa-Gevaert NV, Mortsel, Belgium). The fusing took place with radiant heat. The images were covered with different layers of clear toner particles and with different types and amounts of plasticizer.
  • the susceptibility of the image to cracking was tested by bending the image over a diameter of 1 cm and observing the cracks at the location of the bending mark.
  • the degree of cracking was given the following quotations :
  • the printed full colour image was covered by the deposition of a layer of clear toner particles of CLT1.
  • the meltviscosity of the clear toner was 150 Pas, whereas the meltviscosity of the coloured toner particles was 500 Pas.
  • the meltviscosity of the coloured toner particles was 500 Pas.
  • Printing example 1 was repeated, but on top of the clear finish layer plasticizer A, ethyleneglycolbutyletheracetate, with viscosity at 25 °C of 1.8 mPas and boiling point 190 °C was applied in an amount of 0.5 g/m 2 .
  • Printing example 1 was repeated, but on top of the clear finish layer plasticizer B, dibutylphthalate, with viscosity at 25 °C of 16.4 mPas and boiling point 340 °C was applied in an amount of 0.5 g/m 2 .
  • Printing example 1 was repeated, but on top of the clear finish layer plasticizer C, a bisphenol A/bisphenol F epoxy resin (EPIKOTE DX 235, trade name of Shell Chemical C°) with viscosity at 25 °C between 6,000 and 9,000 mPas was applied in an amount of 0.5 mg/m 2 .
  • a bisphenol A/bisphenol F epoxy resin EPIKOTE DX 235, trade name of Shell Chemical C°
  • Printing example 6 was repeated, but instead of a clear finish layer of clear toner particles CLT1, a finish layer of clear toner particles CLT2 was applied.
  • the meltviscosity of the clear toner was 600 Pas whereas the meltviscosity of the coloured toner particles was 500 Pas.
  • the printed full colour image was covered by the deposition of a layer of clear toner particles of CLT3.
  • the meltviscosity of the clear toner was 80 Pas whereas the meltviscosity of the coloured toner particles was 500 Pas and the toner resin comprised reactive epoxy groups.
  • plasticizer D a bisphenol A epoxy resin (EPIKOTE 828, trade name of Shell Chemical C o ), having a viscosity at 25 °C between 12,000 and 14,000 mPas, was applied in an amount of 0.5 g/m 2 .
  • CLT1 150 -- OK PE2 0.5 1.8/190 A CLT1 150 - OK PE3 2.0 1.8/190 A CLT1 150 0 OK PE4 4.0 1.8/190 A CLT1 150 + Acc PE5 0.5 16.4/340 B
  • CLT1 150 + OK PE6 0.5 6 10 3 - 9 10 3 C
  • OK PE7 0.5 6 10 3 - 9 10 3 C
  • CLT2 600 ++ Acc PE8 0.5 12 10 3 - 14 10 3 D CLT3 80 ++ Acc

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  • Spectroscopy & Molecular Physics (AREA)
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Claims (6)

  1. Image de toner fixée sur un substrat comprenant plusieurs types différents de particules de toner fondues et recouverte d'une couche contenant un plastifiant, ledit plastifiant étant présent en une quantité allant de 0,01 g/m2 à 10 g/m2, caractérisée en ce qu'au moins un desdits différents types de particules de toner contient une résine de toner ayant au moins un groupe réactif A et ledit plastifiant porte au moins un groupe réactif B et lesdits groupes réactifs A et B réagissent ensemble, en formant une liaison chimique entre lesdites particules de toner fondues et ledit plastifiant.
  2. Image de toner selon la revendication 1, dans laquelle lesdits groupes réactifs, aussi bien A que B, sont un élément choisi dans le groupe constitué par les groupes époxy, les groupes amino, les groupes mercapto, les groupes hydroxyle et les groupes carboxyle.
  3. Image de toner selon les revendications 1 ou 2, dans laquelle au moins un desdits différents types de particules de toner contient une résine de toner choisie dans le groupe des polymères de polycondensation ayant un indice d'acide ≥ 2,5 mg KOH/g, des polymères d'addition ayant un indice d'acide ≥ 2,5 mg KOH/g, des polymères de polycondensation ayant un indice d'hydroxyle ≥ 2,5 mg KOH/g, des polymères d'addition ayant un indice d'hydroxyle ≥ 2,5 mg KOH/g et des résines époxy.
  4. Image de toner selon l'une quelconque des revendications 1 à 3, dans laquelle ledit plastifiant est un plastifiant polymère liquide ayant une viscosité à 25°C comprise entre 200 et 20 000 mPa et portant un groupe époxy.
  5. Procédé de production d'une image de toner sur un substrat comprenant les étapes consistant à :
    i) déposer, dans le sens de l'image, plusieurs particules de toner différentes, au moins un de ces différents types de particules de toner contenant une résine de toner ayant un groupe réactif A, sur un substrat formant une image de toner,
    ii) déposer sur ladite image, dans le sens inverse à celui de l'image, un plastifiant portant un groupe réactif B,
    iii) faire réagir ledit groupe réactif A avec ledit groupe réactif B pour former une liaison chimique entre lesdites particules de toner fondues et ledit plastifiant, et
    iv) fixer ladite image de toner sur ledit substrat.
  6. Procédé selon la revendication 6, dans lequel les étapes i) à iv) sont exécutées dans l'ordre indiqué.
EP19970201978 1996-07-01 1997-06-26 Image de révelateur résitent à la fêlure Expired - Lifetime EP0816928B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19970201978 EP0816928B1 (fr) 1996-07-01 1997-06-26 Image de révelateur résitent à la fêlure

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP96201826 1996-07-01
EP96201826 1996-07-01
EP19970201978 EP0816928B1 (fr) 1996-07-01 1997-06-26 Image de révelateur résitent à la fêlure

Publications (3)

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EP0816928A2 EP0816928A2 (fr) 1998-01-07
EP0816928A3 EP0816928A3 (fr) 1998-01-21
EP0816928B1 true EP0816928B1 (fr) 2001-03-21

Family

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EP19970201978 Expired - Lifetime EP0816928B1 (fr) 1996-07-01 1997-06-26 Image de révelateur résitent à la fêlure

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EP (1) EP0816928B1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2213635A1 (fr) 2009-01-29 2010-08-04 AGC Glass Europe Couches de silicates alcalins pour vitrages anti-feu

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0614232B2 (ja) * 1983-12-26 1994-02-23 キヤノン株式会社 画像形成法

Also Published As

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EP0816928A2 (fr) 1998-01-07
EP0816928A3 (fr) 1998-01-21

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