WO1993006597A1 - Enregistrement optique a l'aide de colorants absorbant les infrarouges proches pour obtenir la decoloration - Google Patents

Enregistrement optique a l'aide de colorants absorbant les infrarouges proches pour obtenir la decoloration Download PDF

Info

Publication number
WO1993006597A1
WO1993006597A1 PCT/US1992/007635 US9207635W WO9306597A1 WO 1993006597 A1 WO1993006597 A1 WO 1993006597A1 US 9207635 W US9207635 W US 9207635W WO 9306597 A1 WO9306597 A1 WO 9306597A1
Authority
WO
WIPO (PCT)
Prior art keywords
salts
aryl
infrared
exposure
group
Prior art date
Application number
PCT/US1992/007635
Other languages
English (en)
Inventor
Douglas Eugene Bugner
William Mey
Original Assignee
Eastman Kodak Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eastman Kodak Company filed Critical Eastman Kodak Company
Priority to JP5506103A priority Critical patent/JPH06503277A/ja
Publication of WO1993006597A1 publication Critical patent/WO1993006597A1/fr

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only
    • G11B7/246—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing dyes
    • G11B7/247—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing dyes methine or polymethine dyes
    • G11B7/2472—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing dyes methine or polymethine dyes cyanine
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/0045—Recording
    • G11B7/00455—Recording involving reflectivity, absorption or colour changes
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
    • G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
    • G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only

Definitions

  • This invention relates to optical recording elements containing near-infrared dyes and acid
  • Photogenerating compounds are photogenerating compounds. Recording is accomplished by bleaching of the recording layer upon exposure to near- infrared or near-ultraviolet radiation.
  • This invention relates to imaging and recording methods that employ near-infrared light sources to write and/or read information, particularly in the form of digitized information.
  • near-infrared light sources to write and/or read information, particularly in the form of digitized information.
  • near-infrared radiation is defined as
  • Ablation or pitting processes involve the actual removal of portions of the recording medium with a laser.
  • the laser by removing minute amounts of the recording medium bit by bit, records information on the disk.
  • This information may later be read by scanning the disk with a laser of relatively lower power and/or
  • Recording pits may also be formed by conventional methods such as injection molding or press forming. These processes require expensive precision molding machines. Other disadvantages include limitations on the make-up of molding materials, and clogging of the print-transferring stamps used in production.
  • the recording medium comprises a substance which has an absorption maximum in the near-infrared range of the electromagnetic spectrum and loses or diminishes its power to absorb visible or near-infrared radiation when exposed to ultraviolet radiation, x-rays, electron beams, or ion beams.
  • the information is recorded by exposing the recording medium to ultraviolet radiation, x-rays, electron or ion beams and read by detecting changes in the medium's ability to absorb near-infrared radiation.
  • a recording medium comprising an organometallic complex having an absorption maximum in the near-infrared range, a resinous binder, and a sensitizer capable of generating radicals upon exposure to
  • optical recording media disclosed in Sasagawa et al. and Ozawa et al. may not, however, be recorded upon with near-infrared radiation.
  • the present invention relates to an optical recording element comprising a reflective substrate and a recording layer comprising a near-infrared radiation absorbing dye that undergoes bleaching upon exposure to near-infrared radiation, and an acid photogenerating compound.
  • the near-infrared absorbing dye may also be bleached upon exposure to near-ultraviolet radiation.
  • near-ultraviolet radiation is defined as radiation with a wavelength between about 250-400 nm.
  • a near-ultraviolet absorbing sensitizer may also be added to the recording layer of the element of the present invention to further facilitate bleaching upon exposure to near-ultraviolet radiation.
  • recording element of the present invention allows optical recording with either near-infrared or near-ultraviolet radiation without ablation or pit formation.
  • the present invention also provides a method of optical recording that utilizes the above-described optical recording element.
  • This method comprises the steps of providing the above-described optical recording element, and exposing the element with near-infrared or near-ultraviolet radiation.
  • the recorded information may be read by exposure to near-infrared radiation to detect any color density or hue shift.
  • Information may be recorded in one exposure without any additional steps due to the bleaching of the recording medium.
  • the invention is unique in that information may be recorded on the element utilizing either near-infrared or near-ultraviolet radiation. In either case, the information may be read back using near-infrared
  • compositions when used in conjunction with a photomask containing digitized
  • optically recorded information is therefore quick and cost-efficient.
  • this invention relates to optical recording elements containing near-infrared absorbing dyes and acid-photogenerating compounds. Recording is
  • the recording layer comprises a dye with an absorption maximum in the near-infrared wavelength range of about 700 to 1000 nm, and an acid-photogenerating compound.
  • a near-ultraviolet absorbing sensitizer may also be added to facilitate the absorption of
  • the near-infrared absorbance of the dye is diminished in whole or in part upon exposure of the element to near-infrared or near-ultraviolet radiation.
  • the recording layer of the optical recording element of the present invention is employed as a separate thin layer coated on a suitable substrate.
  • This substrate acts as a support for the recording layer of the element.
  • the substrate may be chosen from a variety of solid materials, either flexible or rigid. Suitable substrate materials include glass, quartz, ceramics, paper, plate-like or foil-like metal, methacrylates, methacrylic acid ester copolymers, polycarbonates, vinyl chlorides, styrene copolymers, polyesters,
  • Preferred substrate materials include methyl methacrylate.
  • the substrate of the recording element of the present invention does not have reflective
  • a reflective layer is typically added.
  • the reflective layer is preferably located between the substrate and the recording layer. Suitable materials for the reflective layer include aluminum, copper, chromium, gold, and rhodium.
  • the thickness of the light reflecting layer should be sufficient to reflect a significant amount of the recording radiation.
  • Leveling and/or priming layers may also be applied to the substrate before application of the
  • the reflective material itself may constitute the substrate if it is self-sustaining and optically smooth.
  • the recording layer of the present invention is normally coated on the substrate. Suitable methods of coating include handcoating, dipcoating, spincoating, and webcoating.
  • the recording layer of the present invention contains a near-infrared absorbing dye.
  • useful near-infrared absorbing dyes include nitroso compounds or a metal complex salt thereof, methine dyes, cyanine dyes, merocyanine dyes, complex cyanine dyes, complex
  • hemioxonol dyes hemioxonol dyes, squaryllium dyes, thiol metal complex salts (including nickel, cobalt, platinum, palladium complex salts), phthalocyanine dyes, triallylmethane dyes, triphenylmethane dyes, iminium dyes, diimonium dyes, naphthoquinone dyes, and anthroquinone dyes.
  • Preferred near-infrared dyes include those of the cyanine class.
  • Particularly useful cyanine dyes include 3,3'-diethylthiatricarbocyanine iodide ("DTTC") and
  • the near-infrared absorbing dye should be present in a concentration sufficient to strongly absorb the activating radiation.
  • concentration of the near-infrared absorbing dye should be present in a concentration sufficient to strongly absorb the activating radiation.
  • near-infrared absorbing dye will vary depending upon the acid-photogenerating compound used, the thickness of the recording layer, and the near-infrared absorbing dye used. Generally, the concentration of the near-infrared absorbing dye will be in the range of 0.1 to 10 percent by weight of the recording layer
  • the acid-photogenerating compound of the element of the present invention should be selected to leave the near-infrared absorbing dye unbleached before the element is exposed to activating radiation. Additionally, the acid-photogenerating compound should not absorb strongly in the visible region of the spectrum unless this
  • Such aromatic onium salts include Group Va, Group VIa, and Group VIla elements.
  • the ability of triarylselenonium salts and triarylsulfonium salts to produce protons upon exposure to ultraviolet and visible light is also known.
  • a representative portion of useful Group Va onium salts are:
  • a representative portion of the useful Group VIla onium salts, including iodonium salts, are the following:
  • Also useful as acid photogenerating compounds are:
  • Aryldiaronium salts such as disclosed in U.S. Patent Nos. 3,205,157; 3,711,396; 3,816,281;
  • a particularly preferred class of acid photogenerators are the diaryliodonium salts and
  • di-(4-t-butylphenyl)iodonium trifluoromethanesulfonate and triphenylsulfonium trifluoromethanesulfonate have shown particular utility.
  • the concentration of the acid photogenerating compound should be sufficient to substantially or completely bleach the near-infrared absorbing dye when the element is exposed to an amount of actinic radiation normally used in the recording process.
  • concentration will generally be in the range of 1 to 50 percent by weight of recording layer.
  • near-infrared sensitive dye and a near-ultraviolet absorbing acid-photogenerating compound may itself absorbing acid-photogenerating compound may itself bleach upon exposure to near-ultraviolet radiation.
  • the addition of a near-ultraviolet absorbing sensitizer will accelerate this process.
  • the amount of sensitizer used varies widely, depending on the type of near-infrared absorbing dye and acid-photogenerating compound used, the thickness of the recording layer, and the particular sensitizer used. Generally, the amount of sensitizer used varies widely, depending on the type of near-infrared absorbing dye and acid-photogenerating compound used, the thickness of the recording layer, and the particular sensitizer used. Generally, the
  • sensitizer may be present in an amount of up to about 10 percent by weight of the recording layer.
  • Iodonium salt acid-photogenerators may be sensitized with ketones such as xanthones, indandiones, indanones, thioxanthones, acetophenones, benzophenones, or other aromatic compounds such as anthracenes,
  • dialkoxyanthracenes dialkoxyanthracenes, perylenes, phenothiazines, etc.
  • Triarylsulfonium salt acid photogenerators may be sensitized by aromatic hydrocarbons, anthracenes, perylenes, pyrenes, and phenothiazines.
  • the recording layer of the optical recording element of the present invention will typically contain a film-forming, polymeric binder to facilitate the coating of the recording layer upon a suitable
  • Useful film-forming binders include the polycarbonates, polyesters, styrenics, methacrylic ester copolymers, vinyl chlorides, cellulose derivatives (such as cellulose acetate, cellulose butyrate and cellulose nitrate), alkyds, polyurethanes, styrene-butadiene copolymers, silicone resins, styrene-alkyd resins;
  • soya-alkyd resins poly(vinyl chloride), poly(vinylidene chloride), vinylidene chloride, acrylonitrile
  • copolymers poly(vinyl acetate), vinyl acetate,vinyl chloride copolymers, poly(vinyl acetals) (such as poly(vinyl butyral)), polyacrylic esters (such as poly(methyl methacrylate), poly(n-butyl methacrylate), poly(isobutyl methacrylate), etc.), polystyrene, nitrated polystyrene, poly(vinylphenol),
  • binders are aromatic esters of polyvinyl alcohol polymers and copolymers. Examples are disclosed in United States Patent
  • the recording layer of the element should have a thickness in the range of 0.1 to 20 ⁇ m. A thickness of 0.1 to 5.0 ⁇ m is preferred.
  • the layer should also be durable, smooth, and free from coating defects such as pinholes or reticulation.
  • This invention also provides a method of optical recording that utilizes the above-described optical recording element.
  • Information is recorded on the optical recording element, which comprises the recording layer described above, by exposing it to actinic radiation.
  • a recording element featuring a recording layer comprising a near-infrared absorbing dye and an
  • near-infrared radiation In the areas exposed to near-infrared radiation from a near-infrared laser the near-infrared absorbing dye undergoes bleaching.
  • Recording may be accomplished using various sources of near-infrared radiation. Suitable sources of near-infrared radiation include diode lasers. A digital pattern may be formed on the optical element by
  • Scanning may be
  • recording is accomplished using near-ultraviolet
  • a recording element with just a near-infrared absorbing dye and an acid photogenerator may bleach upon exposure to near-ultraviolet radiation, it is preferred to add a near-ultraviolet absorbing sensitizer to facilitate such bleaching.
  • Recording using near-ultraviolet radiation may be accomplished through scanning exposures as described above.
  • photomask pattern of digitized information will record the whole of the information in a single exposure.
  • Reading is accomplished in this procedure as described above, using a low power near-infrared laser to detect the differential near-infrared absorption characteristics of the optical recording element of the present invention.
  • the recording element of the present invention may be bleached and recorded with either near-infrared or near-ultraviolet radiation and, in either case, read with near-infrared radiation. None of the disadvantages associated with ablation techniques exist.
  • the element and method of the present invention provide an efficient, low-cost procedure for recording and replicating information on optical recording media.
  • a thin film comprising 25 weight percent
  • DEA near-ultraviolet sensitizer
  • DTTC 3,3'-diethylthiatricarbocyanine iodide
  • PVZAc polymeric binder
  • a transparent support of polyethylene terephthalate by machine coating.
  • the film appears pale green as-coated, and photomicroscopy of a cross-section shows the film to be 2.8 ⁇ m thick.
  • Spectroscopy shows strong absorption from 600 to 850 nm, which displays a maximum absorption at 781 nm with an optical density (“OD”) of greater than 2.5.
  • the film also displays several absorption maxima between 350 and 410 nm due to the near-UV sensitizer (DEA).
  • DEA near-UV sensitizer
  • near-ultraviolet light from a 500W mercury arc source for 90 seconds, for a total exposure of about 2.7 joules/cm 2 .
  • the pale green color was completely faded, and spectroscopy showed an OD of less than 0.10 at wavelengths greater than 600 nm.
  • the breadboard consists of a rotating drum, upon which the film is mounted, and a translation stage which moves the laser beam along the drum length.
  • the drum rotation, the laser beam location, and the laser beam intensity are all controlled by an IBM-AT
  • the drum was rotated at a speed of 120 rpm, and the film was exposed to an electronically generated graduated exposure consisting of 11 exposure steps.
  • the line spacing (distance between scan lines in the
  • step-wedge continuous tone step-wedge
  • the step-wedge thus produced appeared rust-colored in the areas of maximum exposure, and six density steps in the wedge were clearly visible.
  • a film similar to that described in Example 1 is also coated, except that no near-ultraviolet
  • the ratios of the components are 25 wt% ITf, 3 wt% DTTC, and 72 wt%
  • the thickness of the recording layer is 7.4 ⁇ m, and the OD at 780 nm is greater than 4.0.
  • sensitizer will allow for more efficient bleaching with near-ultraviolet radiation.
  • the acid-photogenerating compound is included.
  • the weight ratios of the components are 5 % DEA, 3 % DTTC, and 92 % PVBzAc.
  • the OD at 785 nm is found to be 0.83.
  • bleaching efficiency is defined as:
  • the OD at 700 nm was chosen as the reference point because many of the films display ODs that are off scale at the 780 nm absorption maximum.
  • Table I illustrates the effectiveness of various acid-photogenerating compounds when used in the optical recording element, of the present invention.

Landscapes

  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)

Abstract

Elément d'enregistrement optique, comprenant un colorant absorbant les infrarouges proches et un composé photogénérateur acide, ainsi qu'un sensibilisateur optique absorbant les ultraviolets proches, qui se décolore lorsqu'il est exposé à des rayonnements infrarouges proches ou ultraviolets proches. Un procédé d'enregistrement optique utilisant ledit élément est également décrit.
PCT/US1992/007635 1991-09-16 1992-09-10 Enregistrement optique a l'aide de colorants absorbant les infrarouges proches pour obtenir la decoloration WO1993006597A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5506103A JPH06503277A (ja) 1991-09-16 1992-09-10 近赤外色素を用いて漂白を行う光学記録

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US76079091A 1991-09-16 1991-09-16
US760,790 1996-12-05

Publications (1)

Publication Number Publication Date
WO1993006597A1 true WO1993006597A1 (fr) 1993-04-01

Family

ID=25060206

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1992/007635 WO1993006597A1 (fr) 1991-09-16 1992-09-10 Enregistrement optique a l'aide de colorants absorbant les infrarouges proches pour obtenir la decoloration

Country Status (3)

Country Link
EP (1) EP0557501A1 (fr)
JP (1) JPH06503277A (fr)
WO (1) WO1993006597A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995004955A1 (fr) * 1993-08-05 1995-02-16 Kimberly-Clark Corporation Composition mutable et ses procedes d'utilisation
WO1996019776A1 (fr) * 1994-12-21 1996-06-27 Kimberly-Clark Worldwide, Inc. Formulaires informatiques effaçables par la lumiere
JP2017115026A (ja) * 2015-12-24 2017-06-29 コニカミノルタ株式会社 温度時間積算型インジケータ、及び温度時間積算量の測定方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2043769A1 (de) * 1969-09-03 1971-03-04 Itek Corp Elektrophotographisches Kopier verfahren
FR2139725A1 (en) * 1971-06-02 1973-01-12 Kodak Pathe Dosimetric compsn - contg methine dye and acid generating halogenated polymer
EP0120601A2 (fr) * 1983-02-24 1984-10-03 Minnesota Mining And Manufacturing Company Formation d'images par oxydation
EP0244704A2 (fr) * 1986-04-28 1987-11-11 EASTMAN KODAK COMPANY (a New Jersey corporation) Eléments photoélectrographiques et procédé de formation d'images
EP0278763A2 (fr) * 1987-02-12 1988-08-17 Canon Kabushiki Kaisha Médium d'enrégistrement d'information
EP0302610A2 (fr) * 1987-08-07 1989-02-08 Minnesota Mining And Manufacturing Company Elément photosensible

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2043769A1 (de) * 1969-09-03 1971-03-04 Itek Corp Elektrophotographisches Kopier verfahren
FR2139725A1 (en) * 1971-06-02 1973-01-12 Kodak Pathe Dosimetric compsn - contg methine dye and acid generating halogenated polymer
EP0120601A2 (fr) * 1983-02-24 1984-10-03 Minnesota Mining And Manufacturing Company Formation d'images par oxydation
EP0244704A2 (fr) * 1986-04-28 1987-11-11 EASTMAN KODAK COMPANY (a New Jersey corporation) Eléments photoélectrographiques et procédé de formation d'images
EP0278763A2 (fr) * 1987-02-12 1988-08-17 Canon Kabushiki Kaisha Médium d'enrégistrement d'information
EP0302610A2 (fr) * 1987-08-07 1989-02-08 Minnesota Mining And Manufacturing Company Elément photosensible

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 13, no. 75 (P-831)21 February 1989 & JP,A,63 261 352 ( FUJI PHOTO ) 28 October 1988 *
PATENT ABSTRACTS OF JAPAN vol. 14, no. 332 (P-1077)17 July 1990 & JP,A,21 11 946 ( KONICA ) 24 April 1990 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995004955A1 (fr) * 1993-08-05 1995-02-16 Kimberly-Clark Corporation Composition mutable et ses procedes d'utilisation
WO1996019776A1 (fr) * 1994-12-21 1996-06-27 Kimberly-Clark Worldwide, Inc. Formulaires informatiques effaçables par la lumiere
JP2017115026A (ja) * 2015-12-24 2017-06-29 コニカミノルタ株式会社 温度時間積算型インジケータ、及び温度時間積算量の測定方法

Also Published As

Publication number Publication date
EP0557501A1 (fr) 1993-09-01
JPH06503277A (ja) 1994-04-14

Similar Documents

Publication Publication Date Title
US4380769A (en) Element for recording by thermal deformation
JP3026358B2 (ja) 光記録媒体
JPH02292747A (ja) 光情報記録媒体
JPH0512715A (ja) 光記録媒体
US4538159A (en) Ceramic overcoated optical recording element
US5248990A (en) Process for producing optical recording medium for optical data recording and reproduction
JPH11102538A (ja) 光情報記録媒体
WO1993006597A1 (fr) Enregistrement optique a l'aide de colorants absorbant les infrarouges proches pour obtenir la decoloration
US5328802A (en) Optical recording medium
JP2009047871A (ja) ホログラフィック記録用組成物、ホログラフィック記録媒体、情報記録方法および新規化合物
JP3884412B2 (ja) 記録媒体
US5336584A (en) Optical recording medium
JPH052771A (ja) 光記録媒体
JP2006085762A (ja) 光記録媒体
US5169744A (en) Infra-red laser beam sensitive recording material
JP2006293164A (ja) ３次元光記録媒体
JP2006085771A (ja) 光記録媒体
JPH07248604A (ja) コントラストエンハンスメントリソグラフィ材料及びこれを用いたパターン形成方法
JP3088510B2 (ja) 情報記録媒体
JP3246690B2 (ja) 光記録方法
JP3088501B2 (ja) 情報記録媒体
JPH02201748A (ja) 光記録媒体
EP0420659B1 (fr) Méthode d'enregistrement et de restitution d'informations utilisant un médium pour mémoires optiques
JP2009069812A (ja) 光記録用化合物、光記録用組成物、ホログラフィック記録媒体および情報記録方法
JPH0550757A (ja) 光記録方法

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): JP

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL SE

WWE Wipo information: entry into national phase

Ref document number: 1992919625

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1992919625

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 1992919625

Country of ref document: EP