Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
  • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
  • G03G7/002—Organic components thereof
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
  • G03G7/0006—Cover layers for image-receiving members; Strippable coversheets
  • G03G7/002—Organic components thereof
  • G03G7/0026—Organic components thereof being macromolecular
  • G03G7/004—Organic components thereof being macromolecular obtained by reactions only involving carbon-to-carbon unsaturated bonds
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
  • G03G7/0053—Intermediate layers for image-receiving members
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
  • G03G7/006—Substrates for image-receiving members; Image-receiving members comprising only one layer
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
  • G03G7/00—Selection of materials for use in image-receiving members, i.e. for reversal by physical contact; Manufacture thereof
  • G03G7/006—Substrates for image-receiving members; Image-receiving members comprising only one layer
  • G03G7/0073—Organic components thereof
  • G03G7/008—Organic components thereof being macromolecular
• • 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]
  • Y10T428/31786—Of polyester [e.g., alkyd, etc.]
• • 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]
  • Y10T428/31786—Of polyester [e.g., alkyd, etc.]
  • Y10T428/31797—Next to addition polymer from unsaturated monomers

Definitions

• the present invention relates to transparent elements comprising a polyester support for electrostatic photocopying.
• the electrical charge is dissipated by grounding, the other areas then constituting the electrostatic image of the source document; particles of an electrostatic powder ink (hereinafter toner) of charge opposite to that of the electrostatic surface are then deposited on the latter by electrostatic attraction and then the image thus obtained is brought into contact with a support, for example transparent , which is given an opposite electrical charge to transfer the toner from the electrostatic surface to the support.
• the image thus obtained is fixed on the support by heat treatment and / or by pressure treatment.
• the transparent supports used to make projectable electrostatic photocopies must meet various requirements in order to obtain excellent projected images, in particular sharp images. They must in particular have transparency, dimensional stability and high sliding power, a low ability to accumulate static electricity charges and good adhesion to the image printing material. It is known that these supports must more particularly have a transparency such that the percentage of light dispersed by the passage of a light ray through their thickness, or turbidity, is less than or equal to 7%. It is also known that these supports, when obtained from a bi-oriented film, in particular a polyester, must have dimensional stability such that their shrinkage at 150-170 ° C, that is to say in the temperature conditions necessary for fixing the toner, ie less than 1% in the stretching directions.
• polyester films are a material of choice for producing transparent supports for projectable electrostatic photocopies.
• their low sliding capacity their great power of static electricity accumulation by friction or induction and their relative chemical inertness, which results in a weak adhesion of the toner to the support, are the source of problems which required solutions. complicating obtaining transparent supports and making it more expensive.
• the problem of the slippage of polyester films cannot be resolved by creating a surface roughness by means of particles of a filler dispersed in the mass of the polyester.
• the thickness of the films intended to serve as an electrostatic photocopying medium which is between 50 and 200 ⁇ m, the presence of charge throughout their thickness gives them a high turbidity incompatible with such use.
• Transparency can only be obtained at the cost of a reduction in the filler content which compromises the sliding of the supports and consequently the ability of the supports to slide over each other in the trains used in photocopying machines or to slide on the metal surfaces of said machines.
• the low affinity of polyester films for toner results in easy removal of the latter during handling of photocopies and in progressive deterioration of the image.
• the ability to accumulate static electricity from the polyester support disturbs both the regular deposition of the toner on the support during photocopying, which affects image quality, and the sheet feed by sheet of supports from a ream.
• EP-A-104 074 it was also suggested to deposit on one side of a polyester support film an acrylic coating containing a filler and providing adhesion to the toner and on the other side of the polyester support. , a coating consisting of an electrically conductive polymer; the establishment of a primary coating between the polyester support and the toner-receiving layer is still recommended.
• compositions based on organic solvents pose safety and hygiene problems.
• Some of the solutions adopted involve multiplying the layers of coatings: a) installation of a primer having good adhesion to the polyester support and to the toner-receiving layer; b) deposition of a receptive layer providing adhesion to the toner, good slipperiness and, where appropriate, good electroconduction; and c) possibly depositing, on the face of the support film opposite to that receiving the toner, an antistatic coating.
• the present invention proposes precisely to solve in a simple way the problem posed by obtaining transparent elements for electrostatic photocopying, said elements having excellent transparency, good slipperiness, good adhesion of the toner to the support and good electroconductive and free disadvantages of previous transparent elements.
• transparent elements for electrostatic photocopying denotes elements which can be used directly for making photocopies which can be projected onto a screen and taken in the form of a continuous film or of sheets of suitable format obtained by cutting of films.
• the free carboxylic functions are the total free carboxylic functions of the acrylic polymer.
• the polyesters constituting the layers (A) and (B) of the support film (S) may be identical or different, although it is simpler to use the same polyester for the two types of layers.
• layer (A) it is possible, for layer (A), to use the polyesters usually used to obtain semi-crystalline bi-oriented films.
• These are film-forming linear polyesters, crystallizable by orientation and usually obtained from one or more aromatic dicarboxylic acids or their derivatives (esters of lower aliphatic alcohols, halides for example) and one or more aliphatic glycols .
• aromatic diacids mention may be made of phthalic, terephthalic, isophthalic, naphthalenedicarboxylic acid-2,5; naphthalenedicarboxylic-2,6. These acids can be associated with a minor amount of one or more aliphatic dicarboxylic acids such as adipic, azelaic, hexahydroterephthalic acids.
• aliphatic diols mention may be made of ethylene glycol; propanediol-1,3; 1,4-butanediol.
• the crystallizable film-forming polyesters are polyethylene terephthalates or polynaphthalene dicarboxylates and, in particular, polyethylene terephthalate (PET) or 1,4-butanediol or copolyesters comprising at least 80 mol% of terephthalate or naphthalene units -alkylene glycol dicarboxylates.
• the polyester is a polyethylene terephthalate, the viscosity index of which, measured in a 50/50 mixture by weight of phenol and 1,2-dichloro benzene according to ISO standard 1628-5, is between 55 ml / g and 75 ml / g.
• the thin layer (B) can be formed by the same crystallizable polyester as the layer (A) or by a non-crystallizable polyester or less crystallizable than the polyester constituting the layer (A). Polyesters are then used comprising more or less significant amounts of amorphizing units such as those derived from isophthalic acid, neopentylglycol or cyclohexanedimethanol. It would not be departing from the scope of the present invention to use a mixture of a crystallizable polyester and a polyester with amorphous patterns to produce the thin charged layer (B). Thus, one could use mixtures comprising from 20 to 80% by weight of a crystallizable polyester and from 80 to 20% by weight of a polyester with amorphous units.
• Layer (B) could also consist of a copolyester having a plurality of sulfonic groups or their alkali, alkaline earth or ammonium salts (hereinafter referred to as sulfonated copolyester), or by mixtures of copolyesters of this type with one or more polyesters not containing sulfonic groups such as semi-crystallizable polyesters or polyesters with amorphous units.
• sulfonated copolyester a copolyester having a plurality of sulfonic groups or their alkali, alkaline earth or ammonium salts
• the acrylic polymer comprises units chosen from units derived from acrylic acid, methacrylic acid, alkyl acrylates, alkyl methacrylates, acrylonitrile, methacrylonitrile, acrylamide, methacrylamide , N-methylolacrylamide, N-methoxymethacrylamide, styrene, butadiene, vinyl esters, at least part of these units originating from an alkyl acrylate and / or an alkyl methacrylate.
• the acrylic polymer used in the invention comprises at least units derived from alkyl acrylates chosen from methyl acrylate, ethyl acrylate, propyl acrylates and butyl acrylates and / or units derived from alkyl methacrylates chosen from methyl methacrylate, ethyl methacrylate, propyl methacrylates and butyl methacrylates.
• Acrylic copolymers comprising units derived from methyl and / or ethyl acrylate and methyl and / or ethyl methacrylate are particularly suitable for constituting the primary coating (P) of the transparent elements of the invention.
• the acrylic polymer may also contain acrylic acid and / or methacrylic acid units, insofar as the rate of free carboxylic acid functions is less than 50 millimoles per 100 grams of said acrylic polymer and preferably remains less than or equal to 30 millimoles per 100 g .
• the acrylic polymer used in the composition of the primary coating (P) of the elements of the invention advantageously has a glass transition temperature of between 15 ° C and 30 ° C.
• the antistatic character of the elements for electrostatic photocopying is an important parameter.
• the acrylic polymer constituting the primary (P) of the elements for photocopying may comprise up to 25% by weight of a compound (monomer or polymer) with quaternary ammonium groups.
• This compound containing a quaternary ammonium group may be present in admixture with the acrylic polymer described above or may constitute a part of the units of said acrylic polymer. In other words, it is possible to use a mixture of the acrylic polymer with a compound containing quaternary ammonium groups or a copolymer comprising units described above for the acrylic polymer and units containing quaternary ammonium groups.
• the compound with quaternary ammonium groups represents from 2% to 15% by weight relative to the weight of the acrylic polymer / compound with quaternary ammonium groups.
• the compound containing quaternary ammonium groups of formula (I) will be copolymerizable with the acrylic polymer or will be used in admixture with said acrylic polymer.
• the acrylic polymer does not have a free carboxylic acid function.
• the antistatic device is evaluated from the measurement of a half-discharge time.
• the film surface is charged with a corona treatment at a potential of 500 V.
• the corona charging device is stopped and the decrease in the surface potential is observed.
• the measurement records the time to reach a surface potential of 250 V. The shorter the time, the more the film is antistatic. It is generally considered that a satisfactory level of antistatism is reached as soon as this half-discharge time is less than or equal to 20 seconds and preferably less than or equal to 10 seconds.
• the thickness of the primary coating (P) is preferably equal to or less than 0.2 ⁇ m.
• the support films have as high a transparency as possible. , that is to say a turbidity (or haze) less than or equal to 7%.
• fillers present in the layer (B) is not critical and it is possible to use the fillers usually used to impart to polyester films a roughness sufficient to provide them with good machinability.
• Use is preferably made of mineral fillers such as the oxides and salts of the elements of groups II, III and IV of the periodic table.
• metal salts such as calcium carbonate or barium sulfate; oxides such as silica, alumina, zirconia, mixtures of oxides, silicates or aluminosilicates.
• These fillers may have undergone a treatment intended to limit or prevent agglomeration of the particles which compose them and / or to limit or prevent decohesion at the polyester / particle interface.
• the particle concentration is chosen so as to provide the support film with both a turbidity less than or equal to 7% and a sufficient roughness (Rz less than or equal to 0.6 ⁇ m).
• concentration and the particle size of the fillers are chosen as a function of the thickness of the layer (B) and of the melting point of the polymer (s) constituting it and can be determined by a person skilled in the art. to give the elements the desired transparency and roughness.
• fillers having a relatively narrow distribution of particle diameters that is to say monodisperse fillers.
• the shape of the particles of the charges introduced into the layer (s) (B) is not critical and it is possible to use charges of various shapes, spherical or not.
• the two layers (B) can be distinguished from one another by their thickness, the nature, the concentration or the diameter charge particle size.
• the two layers (B) are preferably identical.
• the composite polyester support film can be obtained by all known methods for obtaining composite films, use is preferably made of composite films obtained by coextrusion which have excellent cohesion at the interface of the layer (A) and layer (s) (B).
• a flow (A) of crystallizable polyester is extruded using a first extruder and, simultaneously, using a second extruder, a flow of polyester (B) intended to form the (or the ) layer (s) (B).
• the two extruders are connected to a coextrusion box in which the stream (B) can, if necessary, be divided into two streams (B).
• the streams of molten polymers are transformed into a multilayer amorphous film by passage through a flat die and the amorphous film thus obtained is subjected to the usual operations of filming: quenching, drawing, thermofixing and winding.
• the filming conditions are those usually used industrially for obtaining oriented semi-crystalline polyester films.
• the amorphous composite film is cooled to a temperature between 10 ° C and 45 ° C on a casting drum.
• the conditions for drawing the extruded composite film are those usually used in the manufacture of semi-crystalline polyester films.
• a mono-stretching or a bi-stretching carried out successively or simultaneously in two directions generally orthogonal or else by sequences of at least 3 stretchings where the stretching direction is changed with each sequence.
• each mono-directional stretch can itself be carried out in several stages. It will thus be possible to associate stretching sequences such as for example two successive bi-stretching treatments, each stretching being able to be carried out in several phases.
• the composite film is subjected to bi-stretching in two perpendicular directions.
• One can, for example, first carry out a stretching in the direction of movement of the film (longitudinal stretching), then a stretching in a perpendicular direction (transverse stretching) or vice versa.
• longitudinal stretching is performed at a rate of 3 to 5 (i.e. the length of the stretched film represents 3 to 5 times the length of the amorphous film) and at a temperature of 80 to 135 ° C and the transverse stretching is carried out with a rate of 3 to 5 at a temperature of 90 to 135 ° C and preferably between 100 and 125 ° C.
• the composite film After stretching, the composite film is subjected to a heat treatment at a temperature between 160 and 240 ° C.
• the stretching can also be carried out simultaneously, that is to say both in the longitudinal direction and in the transverse direction, for example with a stretching ratio of 3 to 5 and at a temperature of 80 to 120 ° C.
• the throughput of the extruders depends on the thicknesses desired for the layers (A) and (B) after drawing.
• the thickness eA of the layer (A) can vary within wide limits; in general, it is between approximately 50 ⁇ m and approximately 150 ⁇ m.
• the thickness eB of the layer (B) is not critical, it must be chosen so that the support film retains excellent transparency and in particular a turbidity of less than 5% and preferably less than or equal at 4%.
• the thickness enabling this objective to be achieved depends, to a certain extent, on the concentration and the particle size of the filler present in the layer (B); in general, it is preferable that the thickness of the layer (B) is equal to or less than 3 ⁇ m.
• eB is between 0.5 ⁇ m and 1.5 ⁇ m.
• the polyester support must have excellent dimensional stability at 150 ° C. More specifically, the support must have a shrinkage rate at 150 ° C. in the two drawing directions, less than or equal to 1% and preferably less than or equal to 0.7%.
• This objective is achieved by subjecting the bi-stretched and heat-fixed film to a relaxation treatment in the transverse direction and in the longitudinal direction according to the usual methods well known to those skilled in the art.
• the rates of shrinkage in the longitudinal direction and in the transverse direction are chosen so that they do not present too great a difference in value, so as to avoid the formation of micro-corrugations of the transparent elements after their passage in photocopying machines. It is preferable that the difference in shrinkage values in both directions is less than or equal to 0.3%.
• the composite polyester support (S) preferably has a turbidity of less than or equal to 7%, a shrinkage rate in the longitudinal and transverse directions of stretching at 150 ° C. less than or equal to 1% and a total roughness Rz less than or equal to 0.6 ⁇ m.
• the coating (P) can be deposited on the composite polyester film by the various techniques known to those skilled in the art.
• a dispersion or an aqueous solution of the acrylic polymer chosen can be deposited by gravity from a slot casting machine, or by passing the film through the emulsion or solution or even by means of transfer rollers.
• the thickness of the layer is controlled by any suitable means.
• the coating can be deposited either before any stretching of the film (in-line coating), or after stretching before or after heat-setting (recovery coating). However, it is preferable to coat the polyester film before stretching or between two stretchings.
• an acrylic polymer latex will be used, prepared by emulsion polymerization, microemulsion or, where appropriate, by polymerization in an organic medium. These techniques familiar to those skilled in the art will not be recalled here.
• the acrylic polymers used in the context of the present invention are preferably used in the form of stable dispersions, or latex, in water or a hydro-organic medium.
• the polymer does not contain a hydrophyl group making it possible to easily obtain a latex, it can be associated with one or more ionic or nonionic surfactants, such as those usually used for obtaining aqueous dispersions and well known to man of career.
• the polymer content of the latexes is not critical and can vary within wide limits. In general, latexes containing from 1 to 50% by weight of polymer are very suitable; preferably, latexes containing from 5 to 30% by weight of polymer are used.
• the size of the particles of the polymer constituting the latex is chosen so that the final thickness of the coating (P) does not erase the roughness of the underlying loaded layer (B); in general, latexes are used whose diameter of the polymer particles is between approximately 0.01 ⁇ m and 0.3 ⁇ m and preferably between 0.05 ⁇ m and 0.15 ⁇ m.
• the amount of aqueous coating composition deposited on the film depends on the one hand on its dry extract content and, on the other hand, on the thickness desired for the coating of the finished film, that is to say after stretching and heat setting when coating takes place online. This amount also depends on the time of coating; one must obviously take into account the variation in thickness of the coating before and after stretching, when the coating is carried out before stretching.
• the polyester film is heat treated to remove the water contained in the coating and, if necessary, to cause crosslinking of the polymer.
• in-line coating it is generally not necessary to carry out a heat treatment; drying and possibly crosslinking are made during stretching and heat setting. It would not, however, depart from the scope of the present invention to carry out, in this case, prior to stretching and heat setting, a heat treatment sufficient to cause the drying of the coated layer.
• the thickness eP of the coating layer (P) is such that it does not erase the roughness of the underlying loaded layer (B).
• the use of on-line coating and the choice of acrylic polymer make it possible to achieve this objective, without detriment to the adhesion of the toner.
• eP is between 0.02 and 0.2 ⁇ m and preferably between 0.02 and 0.15 ⁇ m.
• a support (S) consisting of a thick uncharged layer (A) and at least one thin layer (B) preferably containing a filler, allows easy access, after deposition of the adhesion layer (P) transparent elements for electrostatic photocopying which have all the required transparency, machinability and toner adhesion properties.
• P adhesion layer
• the use of a coextruded composite support (S) makes it possible to easily achieve a good compromise between transparency and machinability.
• the solution is brought to 80 ° C.
• the reaction mixture is maintained for 1 hour at 80 ° C., then is cooled.
• the acrylic polymer has a glass transition temperature of 20 ° C. and a rate of free carboxylic functions of 17 millimoles per 100 g of polymer.
• the solution is brought to 75 ° C.
• reaction mixture is maintained for 1 hour at 75 ° C., then is cooled.
• a latex B with 26% dry extract is obtained.
• the acrylic polymer has a glass transition temperature of 21 ° C and a rate of free carboxylic functions of 0 millimole per 100 g of polymer.
• the solution is brought to 60 ° C.
• the reaction mixture is kept for 1 hour at 60 ° C., then is cooled.
• a latex C with 27% dry extract is obtained.
• the acrylic polymer has a glass transition temperature of 20 ° C and a rate of free carboxylic functions of 0 millimole per 100 g of polymer.
• the solution is brought to 75 ° C.
• the reaction mixture is maintained for 1 hour at 75 ° C., then is cooled.
• a latex D with 27% dry extract is obtained.
• the acrylic polymer has a glass transition temperature of 23 ° C. and a rate of free carboxylic functions of 0 millimole per 100 g of polymer.
• the solution is brought to 75 ° C.
• the reaction mixture is maintained for 1 hour at 75 ° C., then is cooled.
• a latex E with 27% dry extract is obtained.
• the acrylic polymer has a glass transition temperature of 17 ° C and a rate of free carboxylic functions of 0 millimole per 100 g of polymer.
• the solution is brought to 80 ° C.
• the reaction mixture is maintained for 1 hour at 80 ° C., then is cooled.
• a latex I with 25% dry extract is obtained.
• the acrylic polymer has a glass transition temperature of 33 ° C and a rate of free carboxylic functions of 150 millimoles per 100 g of polymer.
• the water-dispersible polyester used is a copolyester with units derived from terephthalic acid, isophthalic acid, Na isophthalic acid-5-sulfonate and ethylene glycol, sold under the brand Gérol PS20.
• the solution is brought to 80 ° C.
• the reaction mixture is maintained for 1 hour at 80 ° C., then is cooled.
• a latex J with 27% dry extract is obtained.
• the acrylic polymer has a glass transition temperature of 30 ° C and a rate of free carboxylic functions of 102 millimoles per 100 g of polymer.
• the solution is brought to 80 ° C.
• the reaction mixture is maintained for 1 hour at 80 ° C., then is cooled.
• a latex K with 25% dry extract is obtained.
• the acrylic polymer has a glass transition temperature of 56 ° C. and a rate of free carboxylic functions of 50 millimoles per 100 g of polymer.
• the solution is brought to 80 ° C.
• the reaction mixture is maintained for 1 hour at 80 ° C., then is cooled.
• a latex L with 25% dry extract is obtained.
• the acrylic polymer has a glass transition temperature of 58 ° C. and a rate of free carboxylic functions of 100 millimoles per 100 g of polymer.
• the solution is brought to 80 ° C.
• the reaction mixture is maintained for 1 hour at 80 ° C., then is cooled.
• a latex M with 25% dry extract is obtained.
• the acrylic polymer has a glass transition temperature of 61 ° C and a rate of free carboxylic functions of 150 millimoles per 100 g of polymer.
• the support film of the examples which follow is a bi-stretched polyethylene terephthalate (PET) film, having a total thickness of 100 ⁇ m, composed of a central layer A of 98.4 ⁇ m of unfilled PET film and on each of the faces. of the layer a with a layer of 0.8 micron of PET containing 0.3000% of an inorganic filler of average diameter 3.5 .mu.m (type Silica SYLOBLOC ®), having the particle size was measured with a laser granulometer from Sympathec ® brand and Helos type.
• PET polyethylene terephthalate
• the preparation is carried out as follows.
• the coextruded amorphous film is first of all mono-stretched in the longitudinal direction with a rate of 3.8, then coated on one of its faces with a latex as prepared in the examples and comparative tests described above (after dilution to present a dry extract of 17% by weight), at a rate of 1.4 g / m (in the wet state).
• the coating is dried, then the film is stretched in the transverse directions with a rate of 3.8.
• the final layer of acrylic polymer is 0.06 ⁇ m.
• the bi-stretched film is thermofixed at 235 ° C.
• the film thus obtained has a haze of 4.5, a total roughness R z of 0.45 ⁇ m and shrinkages at 150 ° C. of 0.6% in the longitudinal and transverse directions.
• the toner adhesion and the half-discharge time are measured.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Laminated Bodies (AREA)
• Light Receiving Elements (AREA)
• Coating Of Shaped Articles Made Of Macromolecular Substances (AREA)
• Photoreceptors In Electrophotography (AREA)
• Liquid Crystal (AREA)
• Electrophotography Using Other Than Carlson'S Method (AREA)
• Devices For Indicating Variable Information By Combining Individual Elements (AREA)
• Polysaccharides And Polysaccharide Derivatives (AREA)
• Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
• Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)

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• 1994
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