EP0982718B1 - Wärmeempfindliches Aufzeichnungselement mit antistatischen Schichten - Google Patents

Wärmeempfindliches Aufzeichnungselement mit antistatischen Schichten Download PDF

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Publication number
EP0982718B1
EP0982718B1 EP19980202898 EP98202898A EP0982718B1 EP 0982718 B1 EP0982718 B1 EP 0982718B1 EP 19980202898 EP19980202898 EP 19980202898 EP 98202898 A EP98202898 A EP 98202898A EP 0982718 B1 EP0982718 B1 EP 0982718B1
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EP
European Patent Office
Prior art keywords
layer
heat mode
recording element
element according
mode recording
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EP19980202898
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English (en)
French (fr)
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EP0982718A1 (de
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Dirk c/o Agfa-Gevaert N.V. Quintens
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Agfa Gevaert NV
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Agfa Gevaert NV
Agfa Gevaert AG
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Priority to EP19980202898 priority Critical patent/EP0982718B1/de
Priority to DE69821611T priority patent/DE69821611D1/de
Priority to JP11241363A priority patent/JP2000071621A/ja
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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
    • B41M5/24—Ablative recording, e.g. by burning marks; Spark recording

Definitions

  • the present invention relates to an improved heat mode recording material based on a thin metallic layer.
  • the recording layer has high optical density and absorbs radiation beams which impinge thereon.
  • the conversion of radiation into heat brings about a local temperature rise, causing a thermal change such as evaporation or ablation to take place in the recording layer.
  • the irradiated parts of the recording layer are totally or partially removed, and a difference in optical density is formed between the irradiated parts and the unirradiated parts (cf. US Pat. Nos. 4,216,501, 4,233,626, 4,188,214 and 4,291,119 and British Pat. No. 2,026,346)
  • the recording layer of such heat mode recording materials is usually made of metals, dyes, or polymers. Recording materials like this are described in 'Electron, Ion and Laser Beam Technology", by M. L. Levene et al.; The Proceedings of the Eleventh Symposium (1969); “Electronics” (Mar. 18, 1968), P. 50; “The Bell System Technical Journal”, by D. Maydan, Vol. 50 (1971), P. 1761; and “Science”, by C. O. Carlson, Vol. 154 (1966), P. 1550.
  • DRAW direct read after write
  • Human readable records are e.g. micro-images that can be read on enlargement and projection.
  • An example of a machine readable DRAW recording material is the optical disc.
  • tellurium and its alloys have been used most widely to form highly reflective thin metal films wherein heating with laser beam locally reduces reflectivity by pit formation (ref. e.g. the periodical 'Physik in phy Zeit', 15. Jahrg. 1984/Nr. 5, 129-130 the article "Optische aside” by Jochen Fricke).
  • Tellurium is toxic and has poor archival properties because of its sensitivity to oxygen and humidity.
  • Other metals suited for use in DRAW heat-mode recording are given in US-P-4499178 and US-P-4388400.
  • Other relatively low melting metals such as bismuth have been introduced in the production of a heat-mode recording layer.
  • a process for the production of a heat mode recording material having "direct read after write” (DRAW) possibilities wherein a web support is provided with a heat mode recording thin metal layer, preferably a bismuth layer, characterized in that in the same vacuum environment a protective organic resin layer in web form is laminated to said supported recording layer by means of an adhesive layer.
  • DRAW direct read after write
  • EP 509 671 discloses an optical information recording medium having one or more substrates and one or more recording layers and respectively providing one or more hardening coats and one or more antistatic coats.
  • the medium shows resistance to scratching and to friction static electricity, rapid discharging, and resistance to dust adhesion on its surface.
  • a metallic recording layer consisting of Te, Bi, etc., is provided on a plastic substrate of an optical information recording medium such as an optical audio disk or DRAW disk.
  • Light transmittable antistatic layers are provided on the outside surfaces thereof. Sticking of dust and discharges by static electricity are prevented.
  • a commercially available material manufactured according to the principles of cited EP 0 384 041 is MASTERTOOL MT8, registered trade name, marketed by Agfa-Gevaert N.V.. It is mostly used after recording as master in the manufacturing of microelectronic circuits and printed circuit boards. We refer to the description in Circuit World , Vol. 22, No. 3, April 1996.
  • the material comprises a double-sided subbed polyethylene terephthalate (PET) support, carrying on one side a bismuth layer of about 0.25 mm thickness deposited in vacuo, a 8 mm thick weak adhesive layer, and a thin PET protective foil of 12 mm thickness.
  • PET polyethylene terephthalate
  • a backing layer On the other side of the subbed PET support a backing layer is provided containing an antistatic and a matting agent (or roughening agent, or spacing agent, terms that will be used as synonyms furtheron).
  • the matting agent prevents sticking to each other of packaged MASTERTOOL sheets, a phenomenon that is likely to lead to transport problems in exposure devices.
  • hydrophobic resin sheet and web materials of low conductivity readily become electrostatically charged by frictional contact with other elements during their manufacture, e.g. during coating or cutting, and during use, e.g. during the recording of information in exposure devices. Since the protective PET top foil of the commercial MASTERTOOL described above is such a hydrophobic resin it is no wonder that transport problems tend to occur in the laser exposure devices due to electrostatic sticking.
  • one or both of the antistatic layers contain(s) a conductive compound the nature of which will be now explained in detail.
  • Ionic conducting compounds are e.g. high molecular weight polymeric compounds having ionic groups, e.g. carboxylic sodium salt groups, built in at frequent intervals in the polymer chain [ref. Photographic Emulsion Chemistry, by G.F. Duffin, - The Focal Press - London and New York (1966) - Focal Press Ltd., p. 168].
  • To further enhance the permanence of the conductivity of ionic conductive polymers it has been proposed to cross-link these polymers with hydrophobic polymers (ref. e.g. US-P 4,585,730, US-P 4,701,403, US-P 4,589, 570, US-P 5,045,441, EP-A-391 402 and EP-A-420 226).
  • Substances having electronic conductivity instead of ionic conductivity have a conductivity independent from moisture. They are particularly suited for use in the production of antistatic layers with permanent and reproducible conductivity.
  • antistatic layers For ecological reasons the coating of antistatic layers should proceed where possible from aqueous solutions by using as few as possible organic solvents.
  • the production of antistatic coatings from aqueous coating compositions being dispersions of polythiophenes in the presence of polyanions is described in published European patent application 0 440 957. Thanks to the presence of the polyanion the polythiophene compound is kept in dispersion.
  • said polythiophene has thiophene nuclei substituted with at least one alkoxy group, or -O(CH 2 CH 2 O) n CH 3 group, n being 1 to 4, or, most preferably, thiophene nuclei that are ring closed over two oxygen atoms with an alkylene group including such group in substituted form.
  • Preferred polythiophenes for use according to the present invention are made up of structural units corresponding to the following general formula (I): in which :
  • the most preferred compound is poly(3,4-ethylenedioxythiophene), (PEDT) with following formula Ibis :
  • the polythiophenes get positive charges by the oxidative polymerization, the location and number of said charges is not determinable with certainty and therefore they are not mentioned in the general formula of the repeating units of the polythiophene polymer.
  • the size of the polymer particles in the coating dispersion is in the range of from 5 nm to 1mm, preferably in the range of 40 to 400 nm.
  • Suitable polymeric polyanion compounds required for keeping said polythiophenes in dispersion are provided by acidic polymers in free acid or neutralized form.
  • the acidic polymers are preferably polymeric carboxylic or sulphonic acids.
  • Examples of such polymeric acids are polymers containing repeating units selected from the group consisting of acrylic acid, methacrylic acid, maleic acid, vinyl sulfonic acid and styrene sulfonic acid or mixtures thereof.
  • the anionic acidic polymers used in conjunction with the dispersed polythiophene polymer have preferably a content of anionic groups of more than 2% by weight with respect to said polymer compounds to ensure sufficient stability of the dispersion.
  • Suitable acidic polymers or corresponding salts are described e.g. in DE-A -25 41 230, DE-A-25 41 274, DE-A-28 35 856, EP-A-14 921, EP-A-69 671, EP-A-130 115, US-P 4,147,550, US-P 4,388,403 and US-P 5,006,451.
  • the polymeric polyanion compounds may consist of straight-chain, branched chain or crosslinked polymers.
  • Cross-linked polymeric polyanion compounds with a high amount of acidic groups are swellable in water and are named microgels.
  • microgels are disclosed e.g. in US-P 4,301,240, US-P 4,677,050 and US-P 4,147,550.
  • the molecular weight of the polymeric polyanion compounds being polyacids is preferably in the range from 1,000 to 2,000,000 and more preferably in the range from 2,000 to 500,000.
  • Polyacids within the above criteria are commercially available, for example polystyrene sulfonic acids and polyacrylic acids, or may be produced by known methods (ref. e.g. Houben-Weyl, Methoden der Organischen Chemie, vol. E20, Makromolekulare Stoffe, Mol 2, (1987), pp. 141 et seq.).
  • free polymeric polyacids applied in conjunction with the polythiophenes it is possible to use mixtures of alkali salts of said polyacids and non-neutralized polyacids, optionally in the presence of monoacids.
  • Free acid groups of the polyanionic polymer may be allowed to react with an inorganic base, e.g. with sodium hydroxide, to obtain a neutral polymer dispersion before coating.
  • the weight ratio of polythiophene polymer to polymeric polyanion compound(s) can vary widely, for example from about 50/50 to 15/85.
  • polystyrene sulphonate PSS
  • One or both of the antistatic layers may further contain a compound or mixtures of compounds which reduce the so-called triboelectric chargeability of the layer. Usually one of these compounds is a perfluorated surfactant.
  • the triboelectric chargebility of a layer versus a reference material is expressed as its Q Far value which is determined as follows.
  • the experimental mounting consists of two concentric cylinders isolated from each other.
  • the external cylinder is connected to the earth potential and the internal cylinder, functioning as cage of Faraday, is connected to an electrometer.
  • the internal cylinder contains a flat metal plate to which a 275 x 35 mm strip of the sample to be measured (e.g. the top layer of MASTERTOOL) is applied.
  • a 60 x 35 strip of the reference material e.g. the backing layer of MASTERTOOL
  • PTFE-block polytetrafluorethylene, a strong insulator
  • the block After discharging of the whole the block is put in the Faraday cage.
  • the triboelectric charge is generated by rubbing the PTFE-block containing the reference sample under its own weight (0.53 N) over the metal plate containing the sample to be measured.
  • the block is moved five times there and back at an average speed of 10 cm/s.
  • the reference material is removed from the inner cylinder and the countercharge is measured.
  • An average (median) of twenty repeated measurements is calculated. It was found experimentally that in order to avoid problems with static charging a Q Far value not surpassing 3.6 x 10 -6 C/m 2 could be allowed for an outermost layer..
  • the antistatic layers can contain several other types of ingredients.
  • a matting agent also called roughening agent or spacing agent may be present.
  • This roughening agent can be chosen from a wide variety of chemical classes and commercial products provided the particles chosen show an excellent mechanical and thermal stability.
  • Preferred roughening agents include following:
  • the spacing particles must be chosen so that they are not optically disturbing.
  • the roughening agent is based on polymethylmethacrylate beads which are preferably cross-linked. They preferably have an average particle size of 0.5 to 5 mm, and most preferably 1 to 4 mm.
  • Other preferred roughening agents are disclosed in EP 0 080 225, EP 0 466 982, and EP 0 698 625.
  • the antistatic layer(s) may contain an adhesion promoting agent, preferably a (co)polymer with hydrophilic groups (see example section furtheron), and a so-called anti-scratch agent, e.g. a polysiloxane-polyether copolymer.
  • an adhesion promoting agent preferably a (co)polymer with hydrophilic groups (see example section furtheron)
  • a so-called anti-scratch agent e.g. a polysiloxane-polyether copolymer.
  • Useful transparent polymeric supports (b) include e.g. cellulose nitrate film, cellulose acetate film, polyvinylacetal film, polystyrene film, polyethylene terephthalate film, polycarbonate film, polyvinylchloride film or poly- ⁇ -olefin films such as polyethylene or polypropylene film.
  • the thickness of such organic resin film is preferably comprised between 0.03 and 0.35 mm.
  • the support is a polyethylene terephthalate layer provided with a subbing layer. This subbing layer can be applied before or after stretching of the polyester film support.
  • the polyester film support is preferably biaxially stretched at an elevated temperature of e.g.
  • the stretching may be accomplished in two stages, transversal and longitudinal in either order or simultaneously.
  • the subbing layer is preferably applied by aqueous coating between the longitudinal and transversal stretch, in a thickness of 0.1 to 5 mm.
  • the subbing layer preferably contains, as described in European Patent Application EP 0 464 906, a homopolymer or copolymer of a monomer comprising covalently bound chlorine. Examples of said homopolymers or copolymers suitable for use in the subbing layer are e.g.
  • polyvinyl chloride polyvinylidene chloride, a copolymer of vinylidene chloride, an acrylic ester and itaconic acid, a copolymer of vinyl chloride and vinylidene chloride, a copolymer of vinyl chloride and vinyl acetate, a copolymer of butylacrylate, vinyl acetate and vinyl chloride or vinylidene chloride, a copolymer of vinyl chloride, vinylidene chloride and itaconic acid, a copolymer of vinyl chloride, vinyl acetate and vinyl alcohol etc.
  • Polymers that are water dispersable are preferred since they allow aqueous coating of the subbing layer which is ecologically advantageous.
  • Possible metals for the recording layer (c) in this invention include Mg, Sc, Y, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Re, Fe, Co, Ni, Ru, Rh, Pd, Ir, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Si, Ge, Sn, As, Sb, Bi, Se, Te. Due to their low melting point Mg, Zn, In, Sn, Bi and Te are preferred. The most preferred metal for the practice of this invention is Bi. Also metal oxides and metal chalcogenides can be used.
  • the metallic recording layer may be applied by vapor deposition, sputtering, ion plating, chemical vapor deposition, electrolytic plating, or electroless plating.
  • the recording layer is preferably provided by vapor deposition in vacuo or, according to a more recent process, by coating from an aqueous medium.
  • a method and an apparatus for a deposition are disclosed, in EP 0 384 041, cited above.
  • an adhesive layer and a top thin polymeric resin, preferably PET, are applied to the vacuum deposited bismuth layer on line in the vacuum chamber.
  • the metal layer preferably bismuth
  • EP-A-0 872 764 is coated from an aqueous medium by conventional coating techniques after chemical reduction of a metal salt.
  • aqueous solution of bismuth ions is prepared.
  • bismuth salt bismuth nitrate is chosen. Almost all bismuth salts are poorly soluble in water.
  • a complexing agent is simply the well-known ethylenediaminetetraacetic acid (EDTA) or a homologous compound or a salt thereof.
  • EDTA ethylenediaminetetraacetic acid
  • Another preferred one is citrate, e.g. triammonium citrate.
  • Suitable complexants include diethylenetriamine-pentaacetic acid (DTPA), trans-1,2-diaminocyclohexane-N,N,N',N'-tetraacetic acid (CDTA), ethyleneglycol-O,O'-bis(2-aminoethyl)-N,N,N',N'-tetraacetic acid (EGTA), N-(2-hydroxyethyl)ethylenediamine-N,N,N'-triacetic acid (HEDTA), etc.
  • DTPA diethylenetriamine-pentaacetic acid
  • CDTA trans-1,2-diaminocyclohexane-N,N,N',N'-tetraacetic acid
  • EGTA ethyleneglycol-O,O'-bis(2-aminoethyl)-N,N,N',N'-tetraacetic acid
  • HEDTA N-(2-hydroxyethyl)ethylenediamine-N,N,N'
  • a particularly preferred protective binder is carboxymethylcellulose (CMC), preferably of the high viscosity type.
  • CMC carboxymethylcellulose
  • Other possible binders include gelatin, arabic gum, poly(acrylic acid), cellulose derivatives and other polysaccharides.
  • the solution can further contain a so-called dispersing aid (also called co-dispersing agent).
  • Suitable dispersing aids in the case of bismuth are pyrophosphates, more particularly a hexametaphosphate such as sodium hexametaphosphate. Probably, the hexametaphosphate adsorbs to the surface of the bismuth particles so that they become negatively charged. By electrostatic repulsion they are kept in dispersion.
  • the bismuth ions in the solution are reduced to metal bismuth particles by means of the addition of a reducing agent.
  • the metal particles are kept in dispersion by the presence of the binder and dispersing aid as described above.
  • a preferred reducing agent is sodium hydrosulphite.
  • Another suitable reducing agent is KBH 4 .
  • Others include glucose, formaldehyde, tin(II)chloride.
  • the reducing agent can be added to the original bismuth salt solution as a solid powder.
  • the reducing agent can be dissolved separately and added to the bismuth salt solution according to a single jet or a double jet procedure.
  • the aqeous medium can directly be coated, but more preferably the superfluous salts are first removed from the aqueous medium in a step 2bis, by well-known methods such as ultracentrifugation followed by redispersing, flocculation and washing followed by redipersing, or ultrafiltration.
  • ultracentrifugation and using CMC as binder a bismuth-CMC deposit is separated.
  • the ultracentrifugation step may be repeated after washing with fresh water.
  • the final deposit is redispersed in an aqueous medium, preferably containing the same or different binder and/or dispersion aid as the original solution.
  • the redispersing aqueous medium preferably contains the same dispersing aid as the original solution, e.g. sodium hexametaphosphate.
  • an antioxidant added at any stage of the preparation, such as ascorbic acid or a derivative thereof is present in order to avoid oxidation to bismuth oxide which would lead to an unacceptable density loss during drying after coating or during conservation of the unprotected bismuth layer.
  • the obtained aqueous medium is coated on the transparent substrate by means of a conventional coating technique.
  • Suitable coating agents include non-ionic agents such as saponins, alkylene oxides e.g. polyethylene glycol, polyethylene glycol/polypropylen glycol condensation products, polyethylene glycol alkyl esters or polyethylene glycol alkylaryl esters, polyethylene glycol esters, polyethylene glycol sorbitan esters, polyalkylene glycol alkylamines or alkylamides, silicone-polyethylene oxide adducts, glycidol derivaties, fatty acid esters of polyhydric alcohols and alkyl esters of saccharides; anionic agenst comprising an acid group such as a carboxy, sulpho, phospho, sulphuric or phosphoric ester group; ampholytic agents such as aminoacids, aminoalkyl sulphonic acids, aminoalkyl sulphates or phosphates, alkyl betaines, and amine-N-oxides; and cationic agents such as aklylamine salt
  • the particle size of the reduced metalic bismuth is preferably comprised between 5 and 300 nm, most preferably 10 and 200 nm.
  • the thickness of this Bi layer is preferably comprised between 0.05 and 1.5 mm, and most preferably between 0.05 and 0.6 mm. When this thickness is too low the recorded images do not have sufficient density. When on the other hand the thickness is too high the sensitivity tends to decrease and the minimal density, i.e. the density after laser recording on the exposed areas tends to be higher.
  • this protective element comprises a transparent organic resin, acting as outermost cover sheet, and an adhesive layer.
  • a method for applying such a protective element by lamination in the same vacuum environment as wherein the deposition of the metal layer took place is also disclosed in EP 0 384 041, cited above.
  • the cover sheet can be chosen from the group of polymeric resins usable for the support of the heat mode element.
  • the cover sheet is also polyethylene terephthalate but preferably substantially thinner than the polyethylene terephthalate of the support.
  • the cover sheet may be provided with a subbing layer to improve the adhesion to the adhesive layer.
  • the adhesive layer may contain a pressure-adhesive or a thermoadhesive.
  • Pressure-sensitive adhesives are usually composed of (a) thermoplastic polymer(s) having some elasticity and tackiness at room temperature (about 20°C), which is controlled optionally with a plasticizer and/or tackifying resin.
  • a thermoplastic polymer is completely plastic if there is no recovery on removal of stress and completely elastic if recovery is instantaneous and complete.
  • Particularly suitable pressure-sensitive adhesives are selected from the group of polyterpene resins, low density polyethylene, a copoly(ethylene/vinyl acetate), a poly(C 1 -C 16 )alkyl acrylate, a mixture of poly(C 1 -C 16 )alkyl acrylate with polyvinyl acetate, and copoly(vinylacetate-acrylate) being tacky at 20°C.
  • pressure-adhesive resins are described in US-P 4,033,770 for use in the production of adhesive transfers (decalcomanias) by the silver complex diffusion transfer process, in the Canadian Patent 728,607 and in the United States Patent 3,131,106.
  • an intrinsically non-tacky polymer may be tackified by the adding of a tackifying substance, e.g. plasticizer or other tackifying resin.
  • a tackifying substance e.g. plasticizer or other tackifying resin.
  • suitable tackifying resins are the terpene tackifying resins described in the periodical "Adhesives Age", Vol. 31, No. 12, November 1988, p. 28-29.
  • the protective element is laminated or adhered to the heat mode recording layer by means of a heat-sensitive also called heat-activatable adhesive layer or thermoadhesive layer, examples of which are described also in US-P 4,033,770.
  • a heat-sensitive also called heat-activatable adhesive layer or thermoadhesive layer
  • the laminating material consisting of adhesive layer and abrasion resistant protective layer and/or the recording web material to be protected by lamination are heated in their contacting area to a temperature beyond the softening point of the adhesive. Heat may be supplied by electrical energy to at least one of the rollers between which the laminate is formed or it may be supplied by means of infra-red radiation.
  • the laminating may proceed likewise by heat generated by high-frequency micro-waves as described e.g. in published EP-A 0 278 818 directed to a method for applying a plastic covering layer to documents.
  • a soft polymeric layer In a second preferred type of protective layer pack two layers are coated on top of the metal layer, a soft polymeric layer and an outermost hard polymeric layer. Combinations of useful compositions for the soft and the hard polymeric layers are described in European patent application appl. No. 98201117 cited above.
  • the soft polymeric layer is based on neocryl or ucecryl, and the hard polymeric layer is based on copoly(ethylacrylate-methacrylic acid).
  • a third type of protective element consists of just one coated layer which due to the presence of a reactive monomer is radiation-curable, preferably UV-curable.
  • a reactive monomer is radiation-curable, preferably UV-curable.
  • any laser can be used which provides enough energy needed for the production of sufficient heat for this particular process of image formation.
  • a powerful infra-red laser is used, most preferably a Nd-YLF laser or diode laser.
  • a cylindrical vacuum chamber contained an electrically heated refractory tray in which bismuth is present as metal vapour source.
  • high vacuum a pressure in the range of 10 -2 Pa to 8x10 -1 Pa
  • the obtained metal vapour was directed towards a web made of polyethylene terephthalate having a thickness of 175 mm and was deposited thereon at a thickness of about 300 nm.
  • the web was supplied by an unwinding roll and was conveyed over a guiding roller against a cooled support roller.
  • the laminating web consisted of a three layer pack composed of (i) a 23 mm thick releasable temporary support (siliconised PET), (ii) a 8 mm thick pressure adhesive layer (acrylate based), and (iii) a 12 mm PET protective layer.
  • the backing layer corresponding to the first antistatic layer (a), had following ingredients :
  • the backing layer was coated from a mixture of N-methylpyrrolidone and isopropanol.
  • the antistatic top layer being the second antistatic layer (e) was composed as follows :
  • a coating composition was prepared containing the following ingredients the preparation of which will be explained hereinafter:
  • the 3,4-disubstituted thiophenes of the above general formula (II) can be obtained by processes known in principle by reacting the alkali metal salts of 3,4-dihydroxy-thiophene-2,5-dicarboxylic esters with the appropriate alkylene vic-dihalides and subsequently decarboxylating the free 3,4-(alkylene-vic-dioxy)thiophene-2,5-dicarboxylic acids (see, for example, Tetrahedron (1967) Vol. 23, 2437-2441 and J. Am. Chem. Soc. 67 (1945) 2217-2218).
  • An addition copolymer of vinylidene chloride, methylmethacrylate and itaconic acid, containing 88 % by weight of vinylidene chloride units, 10 % by weight of methylmethacrylate units, and 2 % by weight of itaconic acid units was prepared as a latex by classical emulsion polymerisation conducted in aqueous medium in the presence of persulphate as initiator.
  • a comparative sample was prepared being the same MASTERTOOL material as described above but without the second antistatic layer (e).
  • the lateral electrical resistance and the Q Far as defined above were determined.

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  • Laminated Bodies (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Laser Beam Processing (AREA)

Claims (17)

  1. Ein wärmeempfindliches Aufzeichnungselement, das der Reihe nach folgende Elemente enthält :
    (a) eine erste antistatische Schicht,
    (b) einen lichtdurchlässigen polymeren Träger,
    (c) eine dünne metallische Aufzeichnungsschicht,
    (d) eine Schutzschicht oder einen Schutzschichtverband,
    (d) eine zweite antistatische Schicht,
    dadurch gekennzeichnet, dass die antistatische Schicht (a) und/oder die antistatische Schicht (b) eine Polythiophenverbindung in einer zureichenden Menge enthält (enthalten), um den seitlichen elektrischen Widerstand auf einen Wert unter 1011 Ohm/□ zu senken.
  2. Wärmeempfindliches Aufzeichnungselement nach Anspruch 1, dadurch gekennzeichnet, dass die Polythiophenverbindung in Form einer wässrigen Dispersion einer Polythiophenverbindung und eines Komplexes eines polymeren Anions in die antistatische(n) Schicht(en) eingebettet wird.
  3. Wärmeempfindliches Aufzeichnungselement nach Anspruch 2, dadurch gekennzeichnet, dass das polymere Anion Polystyrolsulfonat ist.
  4. Wärmeempfindliches Aufzeichnungselement nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die Polythiophenverbindung Polyethylendioxythiophen (PEDT) ist.
  5. Wärmeempfindliches Aufzeichnungselement nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass eine oder beide der antistatischen Schichten eine Verbindung oder ein Gemisch aus Verbindungen enthält (enthalten), durch die (das) die triboelektrische Aufladbarkeit der Schicht(en) dermaßen verringert wird, dass ihr wie in der Patentbeschreibung definierter und ermittelter Qfar-Wert weniger als 3,6 x 10-6 c/m2 beträgt.
  6. Wärmeempfindliches Aufzeichnungselement nach Anspruch 5, dadurch gekennzeichnet, dass die Verbindung oder das Gemisch aus Verbindungen ein Perfluor-Tensid ist oder ein Perfluor-Tensid enthält.
  7. Wärmeempfindliches Aufzeichnungselement nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die dünne Metallschicht (c) eine Wismutschicht mit einer Stärke zwischen 0,05 und 0,6 µm ist.
  8. Wärmeempfindliches Aufzeichnungselement nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die dünne Metallschicht im Vakuum aufgedampft ist.
  9. Wärmeempfindliches Aufzeichnungselement nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die dünne Metallschicht aus einer wässrigen Lösung aufgetragen ist.
  10. Wärmeempfindliches Aufzeichnungselement nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass der Schutzschichtverband (d) eine Klebeschicht und ein hartes polymeres Harz enthält.
  11. Wärmeempfindliches Aufzeichnungselement nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass der Schutzschichtverband (d) eine aufgetragene sanfte polymere Schicht und eine aufgetragene harte polymere Schicht enthält.
  12. Wärmeempfindliches Aufzeichnungselement nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass eine oder beide der antistatischen Schichten (a) und (e) des weiteren ein Mattiermittel enthält (enthalten).
  13. Wärmeempfindliches Aufzeichnungselement nach Anspruch 12, dadurch gekennzeichnet, dass das Mattiermittel PMMA ist.
  14. Wärmeempfindliches Aufzeichnungselement nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass eine oder beide der antistatischen Schichten des weiteren ein Kratzschutzmittel enthält (enthalten).
  15. Wärmeempfindliches Aufzeichnungselement nach Anspruch 14, dadurch gekennzeichnet, dass das Kratzschutzmittel ein Polysiloxan-Polyether-Copolymer ist.
  16. Verfahren zur Bildung eines Thermobildes, wobei ein wärmeempfindliches Aufzeichnungselement nach einem der vorstehenden Ansprüche mit energiereicher Laserstrahlung informationsmäßig belichtet wird.
  17. Verfahren nach Anspruch 16, dadurch gekennzeichnet, dass die energiereiche Laserstrahlung durch einen Infrarotlaser geliefert wird.
EP19980202898 1998-08-28 1998-08-28 Wärmeempfindliches Aufzeichnungselement mit antistatischen Schichten Expired - Lifetime EP0982718B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP19980202898 EP0982718B1 (de) 1998-08-28 1998-08-28 Wärmeempfindliches Aufzeichnungselement mit antistatischen Schichten
DE69821611T DE69821611D1 (de) 1998-08-28 1998-08-28 Wärmeempfindliches Aufzeichnungselement mit antistatischen Schichten
JP11241363A JP2000071621A (ja) 1998-08-28 1999-08-27 ２つの帯電防止層を有するヒ―トモ―ド記録要素

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EP19980202898 EP0982718B1 (de) 1998-08-28 1998-08-28 Wärmeempfindliches Aufzeichnungselement mit antistatischen Schichten

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EP0982718A1 EP0982718A1 (de) 2000-03-01
EP0982718B1 true EP0982718B1 (de) 2004-02-11

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6663956B2 (en) * 2001-04-26 2003-12-16 Mitsubishi Polyerster Film, Llc Antistatic coating and coated film
JP2011005654A (ja) * 2009-06-23 2011-01-13 Toppan Printing Co Ltd 昇華性熱転写記録媒体
JP5526897B2 (ja) * 2010-03-19 2014-06-18 凸版印刷株式会社 昇華性熱転写記録媒体
EP4435065A1 (de) * 2023-03-20 2024-09-25 Agfa-Gevaert Nv Leitfähige polymerdispersion

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Publication number Priority date Publication date Assignee Title
JPS60239946A (ja) * 1984-05-14 1985-11-28 Ricoh Co Ltd 光情報記録媒体
JP2642620B2 (ja) * 1986-06-09 1997-08-20 大日本印刷株式会社 光カード
JPH03162726A (ja) * 1989-11-21 1991-07-12 Hitachi Maxell Ltd 情報記録媒体、情報記録媒体収納用ケース、およびそれらの製造方法
CA2047163C (en) * 1990-07-20 1995-05-16 Kenji Ohta Optical disk
JPH04305830A (ja) * 1991-04-02 1992-10-28 Kuraray Co Ltd 光情報記録媒体
EP0684145B1 (de) * 1994-05-25 1998-08-12 Agfa-Gevaert N.V. Wärmeempfindliches Aufzeichnungselement
EP0687569B1 (de) * 1994-06-15 1998-03-25 Agfa-Gevaert N.V. Verfahren zur Herstellung eines wärmeempfindlichen geschützten Aufzeichnungsmaterials

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DE69821611D1 (de) 2004-03-18
JP2000071621A (ja) 2000-03-07

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