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DE2904879A1 - Bonding coloured pigment to phosphor particles using PVA binder - crosslinked with diazo cpd. to increase adhesion - Google Patents

Bonding coloured pigment to phosphor particles using PVA binder - crosslinked with diazo cpd. to increase adhesion

Info

Publication number
DE2904879A1
DE2904879A1 DE19792904879 DE2904879A DE2904879A1 DE 2904879 A1 DE2904879 A1 DE 2904879A1 DE 19792904879 DE19792904879 DE 19792904879 DE 2904879 A DE2904879 A DE 2904879A DE 2904879 A1 DE2904879 A1 DE 2904879A1
Authority
DE
Germany
Prior art keywords
binder
crosslinked
bonding
phosphor particles
pigment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE19792904879
Other languages
German (de)
Inventor
Bruno Bolz
Gerhard Kroenes
Otto Illerrieden Marzel
Anton Schaub
Hermann Dr Rer Nat Widmann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Licentia Patent Verwaltungs GmbH
Original Assignee
Licentia Patent Verwaltungs GmbH
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 Licentia Patent Verwaltungs GmbH filed Critical Licentia Patent Verwaltungs GmbH
Priority to DE19792904879 priority Critical patent/DE2904879A1/en
Publication of DE2904879A1 publication Critical patent/DE2904879A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
    • C09K11/025—Use of particular materials as binders, particle coatings or suspension media therefor non-luminescent particle coatings or suspension media

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Luminescent Compositions (AREA)

Abstract

In the bonding of coloured pigments (I) to the surface of phosphor particles (II) using a suspension contg. (I), (II) and a binder, PVA crosslinked with a diazo cpd. (III) is used as binder. The process is specified for use in the prodn. of colour TV screens. The adhesion of (I) to the surface of (II) is improved, preventing loss of contrast in areas lacking (I) and undesirable enrichment of (I) in the circulating suspension, which would make it difficult to process the recycled (II). An aq. acid, PVA suspension contg. (III) is used and crosslinking is effected by rendering it alkaline. (III) is a diazonium salt of a sulphonic acid.

Description

Beschreibungdescription

Verfahren zum Aufbringen von~Pigmenten auf Leuchtstoffkörner Die vorliegende Erfindung betrifft ein Verfahren zum festhaftenden Aufbringen von Farbpigmenten auf die Oberfläche von Leuchtstoffkörnern unter Verwendung einer den Leuchtstoff, das Pigment und ein Bindemittel enthaltenden Suspension.Method of applying pigments to phosphor grains The present The invention relates to a method for firmly adhering color pigments onto the surface of phosphor grains using one of the phosphor, the suspension containing the pigment and a binder.

Es ist bekannt, zur Konstrastverbesserung bei Farbbildkathodenstrahlröhren pigmentierte Leuchtstoffe, das heißt an der Oberfläche mit Pigmentfarbstoffen bedeckte Leuchtstoffe zu verwenden. Insbesondere die blau- und rotleuchtenden Leuchtstoffe werden mit Pigmenten entsprechender Körperfarbe, z. B.It is known to improve contrast in color cathode ray tubes pigmented luminescent substances, i.e. those covered with pigment dyes on the surface Use phosphors. In particular the blue and red luminescent substances are with pigments of appropriate body color, z. B.

Ultramarinblau, Kobaltblau oder Eisenoxidrot versehen.Ultramarine blue, cobalt blue or iron oxide red.

Die einzelnen Verarbeitungsschritte bei der Herstellung von Leuchtschirmen für Farbbildfernsehröhren können dazu führen, daß von den pigmentierten Leuchtstoffkörnern das Pigment teil-0 G weise heruntergerieben wird, was aus zweierlei Gründen unerwünscht ist. Zum einen wird der auf dem Leuchtschirm zurückbleibende Leuchtstoff durch fehlende Pigment in seiner Kontrastwirkung verschlechtert und zum anderen erfährt die Rücklaufsuspension eine unerwünschte Anreicherung an Pigment-Farbstoff, was die Wiederaufbereitung des Rücklaufleuchtstoffes erschwert.The individual processing steps in the production of fluorescent screens for color picture television tubes can lead to the pigmented phosphor grains the pigment part-0 G is wisely rubbed down what is made up of two things Reasons is undesirable. On the one hand, there is the one remaining on the fluorescent screen The contrast effect of luminescent material is deteriorated by a lack of pigment and on the other hand, the reflux suspension experiences an undesirable accumulation of pigment dye, which complicates the recycling of the return fluorescent material.

Der vorliegenden Erfindung liegt daher die Aufgabe zugrunde pigmentierte Leuchtstoffe, insbesondere für Farbbildkathodenstrahlröhren zu schaffen, die eine verbesserte Haftung der Pigmente an der Leuchtstoffkorn-Oberfläche aufweisen.The present invention is therefore based on the object of pigmented To create phosphors, in particular for color cathode ray tubes, which have a have improved adhesion of the pigments to the phosphor grain surface.

Gemäß der Erfindung wird vorgeschlagen, daß als Bindemittel mit einer Diazoverbindung vernetzt er Polyvinylalkohol verwendet wird.According to the invention it is proposed that as a binder with a Diazo compound cross-links when polyvinyl alcohol is used.

Bevorzugte Diazoniumverbindungen zur Vernetzung von Polyvinylalkohol als Kleber sind solche, wie sie in den deutschen Offenlegungsschriften Nr. 22 57 920 und Nr. 23 10 617 beschrieben sind.Preferred diazonium compounds for crosslinking polyvinyl alcohol as adhesives are those as described in German Offenlegungsschrift No. 22 57 920 and 23 10 617 are described.

Ein bevorzugter Verfahrensablauf is wie folgt: Der zu pigmentierende Leuchtstoff wird unter Rühren in Wasser eingetragen, Nach Zugabe einer wässerigen, sauren Polyvinylalkohol-Diazo-Lösung wird das Pigment bzw. eine Pigmentsuspension, die zuvor durch Mahlen in einer Kugelmühle homogenisiert wurde, unter Rühren eingetragen. Nach dem Homogenisieren wird vorzugsweise mit Ammoniak alkalisch gemacht. Hierbei wird das Pigment über vernetzt es PVA an der Leuchtstoffoberfläche festgeklebt.A preferred process flow is as follows: The one to be pigmented Phosphor is added to water while stirring, after adding an aqueous, acidic polyvinyl alcohol diazo solution, the pigment or a pigment suspension, which was previously homogenized by grinding in a ball mill, added with stirring. After homogenization, it is preferably made alkaline with ammonia. Here the pigment is glued to the phosphor surface via crosslinked PVA.

Anschließend wird filtriert, mit demineralisiertem Wasser gewaschen, mit Alkohol, vorzugsweise Isoprópylalkohol, nachgewaschen und bei ca. 1400 C getrocknet. Die Verankerung des Pigmentes an der Leuchtstoffoberfläche ist derart, daß selbst bei einem Mahlprozeß bei der Herstellung einer LeuchtAtoffsuspension das Pigment nicht mehr abgerieben wird.Then it is filtered, washed with demineralized water, Washed with alcohol, preferably isopropyl alcohol, and dried at approx. 1400 C. The anchoring of the pigment on the phosphor surface is such that even in a grinding process in the production of a phosphor suspension, the pigment is no longer rubbed off.

Das beschriebene Verfahren bewirkt eine außerordentlich gute Haftung von Pigmenten an den Oberflächen der Leuchtstoffkörner.The method described produces extremely good adhesion of pigments on the surfaces of the phosphor grains.

Die Haftfestigkeit ist derart gut, daß selbst bei Mahlvorgängen zur Zerkleinerung von Zusammenballungen kaum Pigment von den Leuchtstoffkörnern abgerieben wird.The adhesive strength is so good that even during grinding operations Crushing agglomerates hardly rubbed pigment off the phosphor grains will.

Besonders eignet sich das beschriebene Verfahren zum Pigmentieren von Sulfid-, Oxysulfid- und Oxidleuchtstoffen, wie sie üblicherweise bei Farbbildkathodenstrahlröhren zur Herstellung eines Drewfarbleuchtschirms verwendet werden.The process described is particularly suitable for pigmenting of sulphide, oxysulphide and oxide phosphors, as are commonly used in color cathode ray tubes can be used to make a Drew color fluorescent screen.

Claims (5)

Patertansprüche SO verfahren zum festhaftenden Aufbringen von Farbpigmenten auf Gie Oberfläche von Leuchtstoffkörnern unter Verwendung einer den Leuchtstoff, das Pigment und ein Bindemittel enthaltenden Suspension, dadurch gekennzeichnet, daß als Bindemittel mit einer Diazoverbindung vernetzter Polyvinylalkohol verwendet wird.Patent claims SO process for the firmly adhering application of color pigments on the surface of phosphor grains using one of the phosphor, the suspension containing the pigment and a binder, characterized in that that polyvinyl alcohol crosslinked with a diazo compound is used as a binder will. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß eine wässerige, saure und Polyvinylalkohol sowie die Diazoverbindung enthaltende Suspension verwendet wird und die Vernetzung des Polyvinylalkohols durch Alkalischmachen der Suspension vorgenommen wird. 2. The method according to claim 1, characterized in that an aqueous, acidic and polyvinyl alcohol and suspension containing the diazo compound are used and the crosslinking of the polyvinyl alcohol by making the suspension alkaline is made. 3. Verfahren. nach Anspruch 1 oder Anspruch 2, dadurch gekennzeichnet, daß als Diazoverbindung ein Diazoniumsalz der Sulfonsäure verwendet wird. 3. Procedure. according to claim 1 or claim 2, characterized in that that a diazonium salt of sulfonic acid is used as the diazo compound. 4. Verfahren nach einem der Ansprüche 1 bis 3, gekennzeichnet durch seine Anwendung bei der Herstellung von pigmentierten Leuchtstoffen für Leuchtschirme von Farbbildkathodenstrahlröhren.4. The method according to any one of claims 1 to 3, characterized by its use in the manufacture of pigmented phosphors for luminous screens of color cathode ray tubes. 5. Verfahren nach einem der Ansprüche 1 bis 4, gekennzeichnet durch die Anwendung zum Pigmentieren von Sulfid-, Oxysulfid-und c)xidleuchtstofTen.5. The method according to any one of claims 1 to 4, characterized by the application for pigmenting sulphide, oxysulphide and c) xide fluorescent materials.
DE19792904879 1979-02-09 1979-02-09 Bonding coloured pigment to phosphor particles using PVA binder - crosslinked with diazo cpd. to increase adhesion Withdrawn DE2904879A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19792904879 DE2904879A1 (en) 1979-02-09 1979-02-09 Bonding coloured pigment to phosphor particles using PVA binder - crosslinked with diazo cpd. to increase adhesion

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19792904879 DE2904879A1 (en) 1979-02-09 1979-02-09 Bonding coloured pigment to phosphor particles using PVA binder - crosslinked with diazo cpd. to increase adhesion

Publications (1)

Publication Number Publication Date
DE2904879A1 true DE2904879A1 (en) 1980-08-14

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Application Number Title Priority Date Filing Date
DE19792904879 Withdrawn DE2904879A1 (en) 1979-02-09 1979-02-09 Bonding coloured pigment to phosphor particles using PVA binder - crosslinked with diazo cpd. to increase adhesion

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3236387A1 (en) * 1981-10-20 1983-05-11 Tokyo Shibaura Denki K.K., Kawasaki, Kanagawa Method for producing a fluorescent screen
DE19727607A1 (en) * 1997-06-28 1999-01-07 Philips Patentverwaltung Aluminate phosphor with polyphosphate coating

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3236387A1 (en) * 1981-10-20 1983-05-11 Tokyo Shibaura Denki K.K., Kawasaki, Kanagawa Method for producing a fluorescent screen
DE19727607A1 (en) * 1997-06-28 1999-01-07 Philips Patentverwaltung Aluminate phosphor with polyphosphate coating
DE19727607C2 (en) * 1997-06-28 2000-11-23 Philips Corp Intellectual Pty Plasma screen with a UV phosphor preparation and UV phosphor preparation

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