EP0896556A1 - Flexible, multilayered transfer tape - Google Patents

Flexible, multilayered transfer tape

Info

Publication number
EP0896556A1
EP0896556A1 EP97906154A EP97906154A EP0896556A1 EP 0896556 A1 EP0896556 A1 EP 0896556A1 EP 97906154 A EP97906154 A EP 97906154A EP 97906154 A EP97906154 A EP 97906154A EP 0896556 A1 EP0896556 A1 EP 0896556A1
Authority
EP
European Patent Office
Prior art keywords
layer
sensitive adhesive
pressure
transfer
white
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.)
Granted
Application number
EP97906154A
Other languages
German (de)
French (fr)
Other versions
EP0896556B1 (en
Inventor
Lothar Titze
Martina Buchholz
Wolfgang Bauersachs
Karl-Heinz Weissmann
Wolfgang Giersemehl
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.)
Henkel AG and Co KGaA
Henkel Pritt Produktions GmbH
Original Assignee
Henkel AG and Co KGaA
Henkel Pritt Produktions 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 Henkel AG and Co KGaA, Henkel Pritt Produktions GmbH filed Critical Henkel AG and Co KGaA
Publication of EP0896556A1 publication Critical patent/EP0896556A1/en
Application granted granted Critical
Publication of EP0896556B1 publication Critical patent/EP0896556B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/26—Devices, non-fluid media or methods for cancelling, correcting errors, underscoring or ruling
    • B41J29/36—Devices, non-fluid media or methods for cancelling, correcting errors, underscoring or ruling for cancelling or correcting errors by overprinting
    • B41J29/367—Devices, non-fluid media or methods for cancelling, correcting errors, underscoring or ruling for cancelling or correcting errors by overprinting sheet media carrying a pigmented transferable correction layer
    • 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
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, 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
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24851—Intermediate layer is discontinuous or differential
    • Y10T428/24868—Translucent outer layer
    • Y10T428/24876—Intermediate layer contains particulate material [e.g., pigment, 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
    • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
    • 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
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • 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
    • Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer

Definitions

  • Multi-layer, flexible transfer belt Multi-layer, flexible transfer belt
  • the invention relates to a multi-layer, flexible transfer tape with an auxiliary carrier and a pressure-sensitive adhesive layer, wherein between the auxiliary carrier and the pressure-sensitive adhesive layer there is a binder-containing white pigmented transfer layer, which has a stronger adhesion to the pressure-sensitive adhesive layer than to the auxiliary carrier, and the use of this transfer tape in rolled up form in one Handheld device.
  • a transmission band of the above type is shown in EP-A-0 318 804. Thereafter, it is preferably used in a rolled-up hand-held device in order to apply the transfer layer to a substrate simply, quickly and evenly, in order to cover incorrect characters in texts or illustrations and then to make corrections.
  • the applied transfer layer can then be rewritten, for example with ink or ink.
  • the white-pigmented transfer layer is tinted by incorporating black pigments, in particular carbon black.
  • black pigments in particular carbon black.
  • This tinting improves the opacity of the transfer layer.
  • this tinting is limited in so far that if the proportion of black pigment is too high, the white appearance is impaired or one can no longer speak of a white transmission layer. Overall, this solution is not satisfactory.
  • the invention was therefore based on the object of developing the transfer belt described at the outset in such a way that the opacity of the transfer layer is improved without the "whiteness" being significantly impaired when the use mentioned is used.
  • the multilayer, flexible transmission belt according to the invention accordingly comprises three configurations.
  • the preferred embodiment is one in which the non-white pigment is finely dispersed in the pressure-sensitive adhesive layer b). If, in individual cases, the dark impression is undesirable when the pressure-sensitive adhesive layer is monitored, in particular if the non-white pigment is a black pigment, such as carbon black, then it is advantageous to use one of the two variants of configuration a).
  • FIG. 1 shows a transfer tape of the prior art with an auxiliary carrier (1), a transfer layer (2) and a pressure-sensitive adhesive layer (3).
  • FIG. 2 is an illustration of a transmission tape according to the invention in the configuration a1). Between the white pigmented transfer layer (2) and the pressure sensitive adhesive layer (3) there is a plastic-bound intermediate layer (4) which contains a non-white pigment in a finely dispersed distribution.
  • Figure 3 shows a transfer belt according to the invention in the configuration a2) in which the non-white pigmented plastic-bound intermediate layer is sandwiched by the white-pigmented transfer layer, i.e. the non-white pigmented intermediate layer (4) is located between the transfer layer (2) and an additional layer (2A), which have an identical composition.
  • the task of the additional layer (2A) is to conceal the dark color print of the intermediate layer (4) when viewed on a translucent PSA layer.
  • FIG. 4 shows a transfer tape according to embodiment b) according to the invention, in which a non-white pigment in finely dispersed distribution is contained in the pressure-sensitive adhesive layer (3A).
  • non-white pigment is used in the context of the invention, then this should preferably be one which is largely similar to the symbols to be covered, in particular characters. These are regularly blue, black, red or green. In general, the yellow hue will therefore have to be excluded. Black pigments, in particular carbon black, are particularly preferred in practical applications.
  • the particle size of the pigments is not critical in itself. However, a particle size of approximately 1.5 to 0.005 ⁇ m is preferred, in particular from less than about 1 ⁇ m to colloidal particle size.
  • finely divided metal powders such as, in particular, finely divided aluminum.
  • the aluminum particles are preferably platelet-shaped and have a thickness of preferably about 3 to 10 ⁇ m.
  • the linear expansion can easily be up to about 15 ⁇ m.
  • Water-based aluminum pastes have proven particularly suitable. Such aluminum pastes are produced using a special wet grinding process. A particularly preferred paste is commercially available from Carl Schlenk AG under the name Aquasilber aluminum paste LPW / 1380.
  • the intermediate layer and / or the pressure-sensitive adhesive layer preferably contains at least approximately 0.1% by weight of non-white pigment, in particular approximately 0.1 to 5% by weight, and particularly preferably approximately 0.2 to 3.5% by weight, non- white pigment. If the amount of less than 0.1% by weight of non-white pigments in both layers falls below, then the desired effect cannot be achieved to the desired extent. However, if the amount of 5% by weight is exceeded, no significant improvement is achieved. Exceeding can also e.g. in connection with the pressure sensitive adhesive layer lead to the fact that its adhesiveness is impaired. To preserve the functional requirements, a value of about 3.5 should not be exceeded here.
  • the transfer layer is "white pigmented".
  • white pigmented contains conventional white pigments in the required amount in order to give the transfer layer a certain opacity.
  • These include, in particular, titanium oxide (titanium white), as well as precipitated chalk, clay and / or colloidal silicas.
  • titanium oxide titanium white
  • precipitated chalk clay and / or colloidal silicas.
  • suitable pigments of a different color This tinting can be carried out by incorporating suitable amounts of black pigment, in particular carbon black, but also by tinting with other pigments, for example yellow and green. This tinting may be necessary if a color adjustment to the substrate, the characters etc. of which are to be covered, must be carried out.
  • the comments on particle size made in connection with the "non-white pigments" apply here accordingly.
  • Thermoplastic or thermoelastic polymers in aqueous solution or in the form of an aqueous dispersion are preferably used to form the binder-containing transfer layer.
  • the following substances are advantageously used to achieve the object: a) polyurethanes with a molecular weight of 15,000 to 50,000, for example Permuthane U 4924 from Stahl-Chemie or Desmolac 2100 from Bayer AG, b) linear saturated polyesters with a molecular weight of 20,000 to 30,000, e.g. Vitel PE 307 from Goodyear Tire + Rubber, Polyflex 46962 from Morton, c) styrene-isoprene-styrene copolymers, for example Clariflex TR 1107 from Shell
  • acrylates and methacrylates e.g. Plexigum 7 H from Roehm GmbH
  • polyamides, diphenylic acid modified e.g. Scope 30 from Rhone-Poulenc or Emerez 1533 from Emery Chemicals
  • polymer dispersions based on vinyl propionate e.g. Propiofan 6D the
  • the type of plasticizer used should also be considered when choosing the respective binder for forming the transfer layer.
  • this should not penetrate through the normally thin pressure-sensitive adhesive layer and should come into contact with the point to be corrected or the colorants located there and in this way bring about an undesirable coloring of the transfer layer.
  • Common plasticizers such as silicone, castor and mineral oils are suitable for this purpose.
  • Plasticizers preferred in other fields of application, such as phthalic acid esters or oleic alcohol, are not equally suitable.
  • a so-called "lacquering agent” can be incorporated into the binder-containing transfer layer, which precipitates possibly migrating colorants or makes them insoluble, so that they do not migrate into the applied transfer layer and color it again.
  • Suitable varnishes are tannin and tannin derivatives. It is generally possible to use varnishing agents which are contained in inks and inks. You should preferably in an amount of about 0.5 to 5 wt .-%, in particular about 1.5 to 3.5 wt .-% in the binder-containing Transfer layer are present, the range of about 2 to 2.5 wt .-% is very particularly preferred.
  • the binder selected in each case is preferably in the form of an aqueous solution or dispersion.
  • the additives discussed below are optionally added.
  • the choice of the suitable solvent or dispersing agent depends on the type of binder used.
  • low to medium-boiling organic solvents from the group of alcohols, such as ethanol, isopropanol and butanol, the ketones, such as acetone and methyl ethyl ketone, the esters, such as methyl and ethyl acetate, the aromatic hydrocarbons such as toluene and the aliphatic hydrocarbons, such as gasoline in the boiling range of 70 to 140 ° C, alone or in a mixture, but especially water, alone or in a mixture with low-boiling, water-soluble organic solvents.
  • alcohols such as ethanol, isopropanol and butanol
  • the ketones such as acetone and methyl ethyl ketone
  • the esters such as methyl and ethyl acetate
  • aromatic hydrocarbons such as toluene
  • the aliphatic hydrocarbons such as gasoline in the boiling range of 70 to 140 ° C, alone or in a mixture, but especially water, alone or in
  • the concentration of the binder in the solution or dispersion is not essential to the invention.
  • a rough guideline can be that it is between about 3 and 15% by weight, the range of about 6 to 12% by weight being preferred.
  • the solution or dispersion is preferably applied to the auxiliary carrier in an amount of about 15 to 25 g / m 2 (dry weight) and very particularly preferably between about 18 and 22 g / m.
  • An advantageous component of the binder-containing transfer layer is a "tear-off aid".
  • a tear-off aid When the transfer layer is applied to a substrate under tensile stress conditions, this results in a clean tear-off.
  • Cellulose derivatives can be used as a tear-off aid.
  • Particularly preferred cellulose derivatives are those in organic solvents and / or water-soluble cellulose ethers, such as methyl, ethyl, hydroxyethyl, ethylhydroxyethyl and carboxymethyl celluloses, cellulose esters, such as cellulose acetobutyrate and propionate.
  • Various other soluble cellulose derivatives are also suitable, which bring about the desired effects.
  • the cellulose backbone in the soluble cellulose derivative is apparently important, while the groups introduced by the cellulose modification only lead to an increase in the solubility in the chosen solvent.
  • the pressure sensitive adhesive layer can consist of commercially available pressure sensitive adhesives. These are elastic and permanently adhesive self-adhesive compositions with high adhesive forces that adhere immediately to the various surfaces even under low pressure at room temperature. They are preferably applied in aqueous dispersion to the transfer layer and, if appropriate, the intermediate layer already on the auxiliary carrier, since the layers which have already been formed are not dissolved again. Among pressure-sensitive adhesives of this type, those based on acrylate are particularly advantageous.
  • the starting materials can be viscous solutions and dispersions based on rubber, polyacrylates, polyvinyl ethers or polyvinyl isobutylene. Commercial materials based on polyacrylates are preferred. Suitable commercial products are Ucecryl 913 and Ucecryl PC 80 (sold by ucb Dogenbos, Belgium) and the plastic dispersion VP 959/6 (sold by Freihoff).
  • the pressure-sensitive adhesive to be applied which is initially present in an aqueous medium, preferably contains wetting agents or surfactants (sold under the trade name Byk W).
  • a non-white pigment in a finely dispersed distribution is included in the solution or dispersion of the pressure-sensitive adhesive to be applied.
  • the dispersion / solution of the pressure sensitive adhesive is preferably applied to the transfer layer or, respectively, in an amount of approximately 1 to 5 g / m 2 (dry weight) and very particularly preferably in an amount of approximately 2 to 4 g / m 2 to form the pressure sensitive adhesive layer Additional layer applied.
  • the pressure-sensitive adhesive layer is preferably about 1 to 5 ⁇ m, in particular about 2 to 4 ⁇ m thick.
  • the same framework applies to the above-mentioned plastic-bonded intermediate layer after configuration a).
  • the white-pigmented transmission layer is preferably 15 to 25 ⁇ m, in particular 18 to 22 ⁇ m thick. Falling short of the information below would lead to difficulties in production or impair the functionality of the respective layer. Exceeding the limit values would not offer any appreciable improvement and would also mean unnecessary costs. On the other hand, a thicker tape is also not equally advantageous to use in a hand-held device, since a loss of tape length would have to be accepted due to the given volume of the cassette if the thickness is too thick.
  • the present invention is not subject to any significant restrictions in the case of binders for binding the intermediate layer with plastics.
  • those binders can be used which were already used when the white-pigmented transfer layer was built up.
  • the configuration a2) it is even possible to use those binders or plastics that are part of the pressure-sensitive adhesive layer. In this regard, reference is made to the preceding explanations.
  • the auxiliary carrier of the transfer belt according to the invention preferably consists of a plastic film, as is usually used for the carriers of typewriter ribbons, e.g. made of polyethylene terephthalate, polypropylene, polyethylene, polyvinyl chloride or polycarbonate. Silicone-coated paper has also proven to be suitable as an auxiliary carrier. The silicone coating leads to a reduction in the adhesive tension between the binder-containing transfer layer and the auxiliary carrier. It can be replaced by other non-stick agents such as polytetrafluoroethylene.
  • the auxiliary carrier preferably has a thickness of approximately 10 to 16 ⁇ m, in particular approximately 15 to 55 ⁇ m.
  • the materials of the individual layers of the transfer belt according to the invention described above generally meet the basic requirement that, in the case of configuration a), the lowest adhesive stress occurring in the layer composite of transfer layer / intermediate layer / pressure-sensitive adhesive layer (defined by the work of adhesion in accordance with Dupre's equation, ref .: KL Wolf “Physics and Chemistry of Interfaces", Springer Verlag 1957, p. 164) or, in the case of configuration b), the adhesive tension between the transfer layer and the pressure-sensitive adhesive layer is greater than the adhesive tension occurring between the auxiliary carrier and the transfer layer. If this is not the case in individual cases, then a suitable non-stick layer would have to be applied to the auxiliary carrier in order to meet this basic requirement.
  • the transfer layer formed on the substrate should not be adhesive to other materials that come into contact with it, ie when touched by hand or with paper.
  • the following adhesive tension ratios can be specified for the successful use of the transfer tape according to the invention, the symbol "S" representing the adhesive tension ratio between the different materials: S] paper / pressure-sensitive adhesive layer, S 2 weakest bond in the layered composite transfer layer / intermediate layer / pressure-sensitive adhesive layer, S 3
  • Transfer layer / auxiliary carrier, S 4 transfer layer / paper and S 5 pressure-sensitive adhesive layer / (back of) auxiliary carrier As many relationships as possible must be observed: Sj greater than S 3 , S 2 greater than S 3 , S 5 very much smaller than S 2 and S 5 less than S 3 . Furthermore, the free surface of the transfer layer applied to a substrate, in particular paper, should be outwardly as possible show no adherence, ie S 4 is then zero or tends towards zero.
  • the pressure-sensitive adhesive layer has an adhesion to the back of the auxiliary carrier which is less than the lowest adhesion in the layered combination of transfer layer / intermediate layer / pressure-sensitive adhesive layer and less than the adhesion between the transfer layer and the subcarrier.
  • the user takes the housing in his hand and uses the application foot to press the outer (removable) tape layer running over its end edge against the substrate to which it is to be transferred (e.g. a printed sheet of paper to make corrections).
  • the user moves the device relative to the substrate and transfers e.g. a covering layer or a fluorescent layer on the substrate, the flexible auxiliary carrier being unwound from the supply spool and wound onto the take-up spool.
  • the transfer belt according to the invention is associated with a noticeable increase in opacity without having to accept the disadvantages that would arise if the content of tinting pigments in the white-pigmented transfer layer would be increased.
  • a surprising effect is also achieved with deliberately tinted white pigmented transfer layers if the solution features according to the invention are realized. Here too there is an unexpected increase in opacity.
  • the present invention can be explained as follows, without any intention to be bound by these explanations.
  • the transmission layer is also already tinted.
  • the achieved here Effects can be explained by the fact that there are noticeable cavities between the relatively large white pigment particles, in particular titanium dioxide particles, which allow a noticeable passage of light rays down to the characters to be covered, so that these are not completely covered and show through.
  • the mentioned white pigments cannot be produced in a noticeably smaller particle size with sensible work or production effort.
  • the situation is different here, for example, with soot particles, the particles of which can easily be produced in coloidal particle size.
  • the smaller soot particles are arranged in the cavities with the result that the passage of light rays is at least restricted.
  • the solution features a) and / or b) according to the invention are implemented, not only is the desirable whiteness of the white-pigmented transfer layer largely retained, but the opacity of the transfer layer is surprisingly favorable Dimensions is raised. This is easily recognizable to a viewer. The possibility of tinting the transmission layer to a small extent remains unaffected.
  • Titanium dioxide 35.00 parts by weight
  • aqueous hollow sphere dispersion is prepared as follows:
  • the above masking compound is applied with a doctor knife in an amount of 18 g / m 2 onto a siliconized paper carrier. Then the water is evaporated at about 80 ° C by passing warm air over it.
  • aqueous dispersion consisting of the following constituents is then applied to the surface of the transfer layer using a doctor blade.
  • Example 1 was repeated, except that the following recipe was used for the adhesive layer:

Landscapes

  • Adhesive Tapes (AREA)
  • Decoration By Transfer Pictures (AREA)
  • Materials For Medical Uses (AREA)
  • Insulated Conductors (AREA)
  • Laminated Bodies (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Duplication Or Marking (AREA)
  • Pens And Brushes (AREA)
  • Belt Conveyors (AREA)
  • Manufacturing Of Electric Cables (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)

Abstract

A flexible, multilayered transfer tape is described which contains an auxiliary support, a layer of pressure-sensitive adhesive and a binder containing a white-pigmented transfer layer having greater adhesion to the pressure-sensitive adhesive layer than to the auxiliary support. The transfer layer, which contains a binder in addition to a white pigment, is present between the auxiliary support and the pressure-sensitive adhesive layer. The transfer tape is characterized in that a non-white pigment is present in finely dispersed form in either or both of a polymer-bonded interlayer and the pressure-sensitive adhesive layer. The polymer-bonded interlayer may be situated between the white-pigmented transfer layer and the pressure-sensitive adhesive layer or in the white-pigmented transfer layer itself. Such transfer tapes have significantly improved covering capacity as compared to transfer tapes in which only the white-pigmented transfer layer is tinted.

Description

Mehrschichtiges, flexibles Übertragungsband Multi-layer, flexible transfer belt
Die Erfindung betrifft ein mehrschichtiges, flexibles Übertragungsband mit einem Hilfsträger und einer Haftkleberschicht, wobei zwischen dem Hilfsträger und der Haftkleberschicht eine bindemittelhaltige weißpigmentierte Ubertragungsschicht, die zur Haftkleberschicht eine stärkere Haftung als zum Hilfsträger aufweist, vorliegt, sowie die Verwendung dieses Übertragungsbandes in aufgerollter Form in einem Handgerät.The invention relates to a multi-layer, flexible transfer tape with an auxiliary carrier and a pressure-sensitive adhesive layer, wherein between the auxiliary carrier and the pressure-sensitive adhesive layer there is a binder-containing white pigmented transfer layer, which has a stronger adhesion to the pressure-sensitive adhesive layer than to the auxiliary carrier, and the use of this transfer tape in rolled up form in one Handheld device.
Ein Übertragungsband der obigen Art geht aus der EP-A-0 318 804 hervor. Danach wird es vorzugsweise in einem Handgerät in aufgerollter Form verwendet, um damit einfach, schnell und gleichmäßig die Ubertragungsschicht auf ein Substrat aufzutragen, um fehlerhafte Schriftzeichen bei Texten oder Abbildungen zu überdecken und anschließend Korrekturen vorzunehmen. Die aufgetragene Ubertragungsschicht kann dann, beispielsweise mit Tinte oder Tusche, erneut beschriftet werden.A transmission band of the above type is shown in EP-A-0 318 804. Thereafter, it is preferably used in a rolled-up hand-held device in order to apply the transfer layer to a substrate simply, quickly and evenly, in order to cover incorrect characters in texts or illustrations and then to make corrections. The applied transfer layer can then be rewritten, for example with ink or ink.
Bei dem beschriebenen Übertragungsband ist es von Vorteil, wenn die weißpigmentierte Ubertragungsschicht durch Einverleibung von Schwarzpigmenten, insbesondere Ruß, eingetönt wird. Durch dieses Eintönen wird die Deckkraft der Ubertragungsschicht verbessert. Diesem Eintönen sind jedoch insofern Grenzen gesetzt, als bei zu hohem Anteil an Schwarzpigment das weiße Erscheinungsbild beeinträchtigt wird bzw. man nicht mehr von einer weißen Ubertragungsschicht sprechen kann. Insgesamt gesehen stellt diese Lösung nicht zufrieden.In the case of the transfer belt described, it is advantageous if the white-pigmented transfer layer is tinted by incorporating black pigments, in particular carbon black. This tinting improves the opacity of the transfer layer. However, this tinting is limited in so far that if the proportion of black pigment is too high, the white appearance is impaired or one can no longer speak of a white transmission layer. Overall, this solution is not satisfactory.
Der Erfindung lag daher die Aufgabe zugrunde, das eingangs bezeichnete Übertragungsband so weiterzubilden, daß bei der angesprochenen Verwendung die Deckfähigkeit der Ubertragungsschicht verbessert wird, ohne daß der "Weißgrad" stark beeinträchtigt wird.The invention was therefore based on the object of developing the transfer belt described at the outset in such a way that the opacity of the transfer layer is improved without the "whiteness" being significantly impaired when the use mentioned is used.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß a) in einer kunststoffgebundenen Zwischenschicht, die sich al) zwischen der weißpigmentierten Ubertragungsschicht und der Haftkleber¬ schicht oder a2) in der weißpigmentierten Ubertragungsschicht befindet, und/oder b) in der Haftkleberschicht ein nicht-weißes Pigment in fein-disperser Verteilung enthalten ist. Insgesamt umfaßt demzufolge das erfindungsgemäße mehrschichtige, flexible Über¬ tragungsband drei Ausgestaltungen. Bevorzugt ist dabei die Ausgestaltung, bei der in der Haftkleberschicht b) das nicht-weiße Pigment fein dispergiert ist. Wenn im Einzelfall bei Aufsicht auf die Haftkleberschicht deren dunkler Eindruck unerwünscht ist, insbesondere wenn es sich bei dem nicht-weißen Pigment um ein Schwarzpigment, wie Ruß, handelt, dann ist es vorteilhaft, eine der beiden Varianten der Ausgestaltung a) zu nutzen.This object is achieved according to the invention in that a) in a plastic-bound intermediate layer, which is a1) between the white-pigmented transfer layer and the pressure-sensitive adhesive layer or a2) in the white-pigmented transfer layer, and / or b) in the pressure-sensitive adhesive layer, a non-white pigment is contained in a finely dispersed distribution. Overall, the multilayer, flexible transmission belt according to the invention accordingly comprises three configurations. The preferred embodiment is one in which the non-white pigment is finely dispersed in the pressure-sensitive adhesive layer b). If, in individual cases, the dark impression is undesirable when the pressure-sensitive adhesive layer is monitored, in particular if the non-white pigment is a black pigment, such as carbon black, then it is advantageous to use one of the two variants of configuration a).
Die drei Ausgestaltungen des erfindungsgemäßen Übertragungsbandes sollen anhand der beiliegenden Figuren näher erläutert werden.The three configurations of the transmission tape according to the invention will be explained in more detail with reference to the accompanying figures.
Figur 1 stellt ein Übertragungsband des Standes der Technik mit einem Hilfsträger (1), einer Ubertragungsschicht (2) und einer Haftkleberschicht (3) dar.FIG. 1 shows a transfer tape of the prior art with an auxiliary carrier (1), a transfer layer (2) and a pressure-sensitive adhesive layer (3).
Figur 2 ist eine Darstellung einer erfindungsgemäßen Übertragungsbandes nach der Ausgestaltung al). Zwischen der weißpigmentierten Ubertragungsschicht (2) und der Haftkleberschicht (3) befindet sich eine kunststoffgebundene Zwischenschicht (4), die in fein-disperser Verteilung ein nicht-weißes Pigment enthält.FIG. 2 is an illustration of a transmission tape according to the invention in the configuration a1). Between the white pigmented transfer layer (2) and the pressure sensitive adhesive layer (3) there is a plastic-bound intermediate layer (4) which contains a non-white pigment in a finely dispersed distribution.
Figur 3 stellt ein erfindungsgemäßes Übertragungsband in der Ausgestaltung a2) dar, bei der die nicht-weißpgimentierte kunststoffgebundene Zwischenschicht sandwich-artig von der weißpigmentierten Ubertragungsschicht eingeschlossen ist, d.h. die nicht- weißpigmentierte Zwischenschicht (4) befindet sich zwischen der Ubertragungsschicht (2) und einer Zusatzschicht (2A), die identische Zusammensetzung aufweisen. Die Aufgabe der Zusatzschicht (2A) ist es, den dunklen Farbdruck der Zwischenschicht (4) bei Aufsicht auf eine durchscheinende Haftkleberschicht zu kaschieren.Figure 3 shows a transfer belt according to the invention in the configuration a2) in which the non-white pigmented plastic-bound intermediate layer is sandwiched by the white-pigmented transfer layer, i.e. the non-white pigmented intermediate layer (4) is located between the transfer layer (2) and an additional layer (2A), which have an identical composition. The task of the additional layer (2A) is to conceal the dark color print of the intermediate layer (4) when viewed on a translucent PSA layer.
Figur 4 stellt ein erfindungsgemäßes Übertragungsband nach Ausgestaltung b) dar, bei dem in der Haftkleberschicht (3A) ein nicht-weißes Pigment in fein-disperser Verteilung enthalten ist.FIG. 4 shows a transfer tape according to embodiment b) according to the invention, in which a non-white pigment in finely dispersed distribution is contained in the pressure-sensitive adhesive layer (3A).
Wenn im Rahmen der Erfindung von einem "nicht-weißen Pigment" gesprochen wird, dann soll es sich hier vorzugsweise um ein solches handeln, das weitgehende Ähnlichkeit mit den zu überdeckenden Symbolen, insbesondere Schriftzeichen, hat. Diese sind regelmäßig blau, schwarz, rot oder grün. Im allgemeinen wird demzufolge der gelbe Farbton auszuschließen sein. Besonders bevorzugt in praktischen Anwendungsfällen sind Schwarzpigmente, insbesondere Ruß. Die Teilchengröße der Pigmente ist an sich nicht kritisch. Bevorzugt wird jedoch eine Teilchengröße von etwa 1 ,5 bis 0,005 μm, insbesondere von weniger als etwa 1 μm bis zu kolloidaler Teilchengröße. Anstelle farbiger Pigmente können auch feinteilige Metallpulver, wie insbesondere feinteiliges Aluminium, eingesetzt werden. Die Aluminiumteilchen sind vorzugsweise plättchenförmig und weisen eine Dicke von vorzugsweise etwa 3 bis 10 μm auf. Die Längenausdehnung kann problemlos bis zu etwa 15 μm betragen. Als besonders geeignet haben sich Aluminiumpasten auf Wasserbasis erwiesen. Derartige Aluminiumpasten werden nach einem speziellen Naßmahlverfahren hergestellt. Eine besonders bevorzugte Paste ist unter der Bezeichnung Aquasilber Aluminiumpaste LPW/1380 von der Firma Carl Schlenk AG im Handel.If the term "non-white pigment" is used in the context of the invention, then this should preferably be one which is largely similar to the symbols to be covered, in particular characters. These are regularly blue, black, red or green. In general, the yellow hue will therefore have to be excluded. Black pigments, in particular carbon black, are particularly preferred in practical applications. The particle size of the pigments is not critical in itself. However, a particle size of approximately 1.5 to 0.005 μm is preferred, in particular from less than about 1 μm to colloidal particle size. Instead of colored pigments, it is also possible to use finely divided metal powders, such as, in particular, finely divided aluminum. The aluminum particles are preferably platelet-shaped and have a thickness of preferably about 3 to 10 μm. The linear expansion can easily be up to about 15 μm. Water-based aluminum pastes have proven particularly suitable. Such aluminum pastes are produced using a special wet grinding process. A particularly preferred paste is commercially available from Carl Schlenk AG under the name Aquasilber aluminum paste LPW / 1380.
Die Zwischenschicht und/oder die Haftkleberschicht enthält vorzugsweise mindestens etwa 0, 1 Gew. % nicht-weißes Pigment, insbesondere etwa 0, 1 bis 5 Gew. % , und besonders bevorzugt etwa 0,2 bis 3,5 Gew. % , nicht-weißes Pigment. Wird die Menge von weniger als 0, 1 Gew. % an nicht-weißen Pigmenten in beiden Schichten unterschritten, dann ist der angestrebte Effekt nicht in dem gewünschten Umfang zu erzielen. Wird jedoch die Menge von 5 Gew. % überschritten, dann wird keine nennenswerte Verbesserung mehr erzielt. Eine Überschreitung kann auch z.B. im Zusammenhang mit der Haftkleberschicht dazu führen, daß deren Klebefähigkeit beeinträchtigt wird. Zur Bewahrung der funktionellen Erfordernisse sollte hier ein Wert von etwa 3,5 nicht überschritten werden.The intermediate layer and / or the pressure-sensitive adhesive layer preferably contains at least approximately 0.1% by weight of non-white pigment, in particular approximately 0.1 to 5% by weight, and particularly preferably approximately 0.2 to 3.5% by weight, non- white pigment. If the amount of less than 0.1% by weight of non-white pigments in both layers falls below, then the desired effect cannot be achieved to the desired extent. However, if the amount of 5% by weight is exceeded, no significant improvement is achieved. Exceeding can also e.g. in connection with the pressure sensitive adhesive layer lead to the fact that its adhesiveness is impaired. To preserve the functional requirements, a value of about 3.5 should not be exceeded here.
Die Ubertragungsschicht ist "weißpigmentiert" . Mit anderen Worten bedeutet das, daß sie übliche Weißpigmente in der erforderlichen Menge enthält, um der Ubertragungsschicht eine gewisse Deckfähigkeit zu verleihen. Hierzu zählen insbe- sondere Titandoxid (Titanweiß), sowie gefällte Kreide, Tonerde und/oder kolloidale Kieselsäuren. Dies schließt im Rahmen der Erfindung nicht aus, daß sie zusätzlich mit geeigneten anders-farbigen Pigmenten abgetönt ist. Dieses Abtönen kann durch Einverleibung geeigneter Mengen an Schwarzpigment, insbesondere Ruß, aber auch durch Abtönen mit anderen Pigmenten, beispielsweise gelb und grün, erfolgen. Diese Abtönung kann erforderlich sein, wenn eine farbliche Anpassung an das Substrat, dessen Schriftzeichen etc. überdeckt werden sollen, erfolgen muß. Die Ausführungen zur Teilchengröße, die im Zusammenhang mit den "nicht-weißen Pigmenten" vorgenommen wurden, gelten hier entsprechend.The transfer layer is "white pigmented". In other words, this means that it contains conventional white pigments in the required amount in order to give the transfer layer a certain opacity. These include, in particular, titanium oxide (titanium white), as well as precipitated chalk, clay and / or colloidal silicas. This does not exclude within the scope of the invention that it is additionally tinted with suitable pigments of a different color. This tinting can be carried out by incorporating suitable amounts of black pigment, in particular carbon black, but also by tinting with other pigments, for example yellow and green. This tinting may be necessary if a color adjustment to the substrate, the characters etc. of which are to be covered, must be carried out. The comments on particle size made in connection with the "non-white pigments" apply here accordingly.
Zur Ausbildung der bindemittelhaltigen Ubertragungsschicht werden vorzugsweise thermoplastische oder thermoelastische Polymere in wäßriger Lösung oder in Form einer wäßrigen Dispersion eingesetzt. Im Rahmen der Erfindung werden zur Lösung der gestellten Aufgabe mit Vorteil folgende Substanzen verwendet: a) Polyurethane eines Molekulargewichtes von 15.000 bis 50.000, z.B. Permuthane U 4924 der Firma Stahl-Chemie oder Desmolac 2100 der Firma Bayer AG, b) lineare gesättigte Polyester eines Molekulargewichtes von 20.000 bis 30.000, z.B. Vitel PE 307 der Firma Goodyear Tire + Rubber, Polyflex 46962 der Firma Morton, c) Styrol-Isopren-Styrol-Copolymerisate, z.B. Clariflex TR 1107 der Firma Shell-Thermoplastic or thermoelastic polymers in aqueous solution or in the form of an aqueous dispersion are preferably used to form the binder-containing transfer layer. In the context of the invention, the following substances are advantageously used to achieve the object: a) polyurethanes with a molecular weight of 15,000 to 50,000, for example Permuthane U 4924 from Stahl-Chemie or Desmolac 2100 from Bayer AG, b) linear saturated polyesters with a molecular weight of 20,000 to 30,000, e.g. Vitel PE 307 from Goodyear Tire + Rubber, Polyflex 46962 from Morton, c) styrene-isoprene-styrene copolymers, for example Clariflex TR 1107 from Shell
Chemie, d) Acrylate und Methacrylate, z.B. Plexigum 7 H der Roehm GmbH, e) Polyamide, diphenylsäure-modifiziert, z.B. Scope 30 der Firma Rhone-Poulenc oder Emerez 1533 der Firma Emery Chemicals, f) Polymerdispersionen auf der Basis von Vinylpropionat, z.B. Propiofan 6D derChemistry, d) acrylates and methacrylates, e.g. Plexigum 7 H from Roehm GmbH, e) polyamides, diphenylic acid modified, e.g. Scope 30 from Rhone-Poulenc or Emerez 1533 from Emery Chemicals, f) polymer dispersions based on vinyl propionate, e.g. Propiofan 6D the
Firma BASF und g) in Wasser lösliches carboxymethylgruppenhaltiges Polymethacrylat, z.B. Rohagit SD 15 der Firma Roehm GmbH.BASF and g) water-soluble carboxymethyl group-containing polymethacrylate, e.g. Rohagit SD 15 from Roehm GmbH.
Diese Aufzählung erhebt keinen Anspruch auf Vollständigkeit und bedeutet keine Einschränkung in ihrer Auswahl. Vielmehr ist es für den Fachmann ohne weiteres ersichtlich, daß auch noch andere Bindemittel in Frage kommen können, zumal in der Art des Bindemittels nicht das Wesen der Erfindung zu sehen ist.This list does not claim to be complete and does not imply any restriction in its selection. Rather, it is readily apparent to the person skilled in the art that other binders can also be considered, especially since the nature of the binder is not the essence of the invention.
Um die Erfindung weitergehend zu optimieren, sollte bei der Wahl des jeweiligen Bindemittels zur Ausbildung der Ubertragungsschicht auch die Art des dabei herangezogenen Weichmachers bedacht werden. Dieser sollte beim Aufbringen der Ubertragungsschicht auf die zu korrigierende bzw. zu bedeckende Fläche nicht durch die normalerweise dünn ausgebildete Haftkleberschicht dringen und mit der zu korrigierenden Stelle bzw. den sich dort befindenden Farbmitteln in Kontakt treten und auf diese Weise eine unerwünschte Einfärbung der Ubertragungsschicht bewirken. Für diesen Zweck sind gängige Weichmacher, wie Silikon-, Rizinus- und Mineralöle geeignet. In anderen Anwendungsbereichen bevorzugt eingesetzte Weichmacher, wie beispielsweise Phthalsäureester oder Oleinalkohol, sind nicht gleichermaßen gut geeignet. Um dem angesprochenen nachteiligen Effekt von Weichmachern in Grenzfällen entgegenzuwirken, kann der bindemittelhaltigen Ubertragungsschicht ein sogenanntes "Verlackungsmittel" einverleibt werden, das eventuell migrierende Farbmittel ausfällt bzw. unlöslich macht, so daß diese nicht in die aufgebrachte Ubertragungsschicht migrieren und diese wieder einfärben. Geeignete Verlackungsmittel sind Tannin und Tanninderivate. Es lassen sich im allgemeinen Verlackungsmittel heranziehen, die in Tinten und Tuschen enthalten sind. Sie sollten vorzugsweise in einer Menge von etwa 0,5 bis 5 Gew.-% , insbesondere etwa 1,5 bis 3,5 Gew.-% in der bindemittelhaltigen Übertragungsschicht vorliegen, wobei der Bereich von etwa 2 bis 2,5 Gew.-% ganz besonders bevorzugt ist.In order to further optimize the invention, the type of plasticizer used should also be considered when choosing the respective binder for forming the transfer layer. When the transfer layer is applied to the surface to be corrected or to be covered, this should not penetrate through the normally thin pressure-sensitive adhesive layer and should come into contact with the point to be corrected or the colorants located there and in this way bring about an undesirable coloring of the transfer layer. Common plasticizers such as silicone, castor and mineral oils are suitable for this purpose. Plasticizers preferred in other fields of application, such as phthalic acid esters or oleic alcohol, are not equally suitable. In order to counteract the above-mentioned disadvantageous effect of plasticizers in borderline cases, a so-called "lacquering agent" can be incorporated into the binder-containing transfer layer, which precipitates possibly migrating colorants or makes them insoluble, so that they do not migrate into the applied transfer layer and color it again. Suitable varnishes are tannin and tannin derivatives. It is generally possible to use varnishing agents which are contained in inks and inks. You should preferably in an amount of about 0.5 to 5 wt .-%, in particular about 1.5 to 3.5 wt .-% in the binder-containing Transfer layer are present, the range of about 2 to 2.5 wt .-% is very particularly preferred.
Zur Ausbildung der Ubertragungsschicht liegt das jeweils gewählte Bindemittel vorzugsweise als wäßrige Lösung oder Dispersion vor. Zusätzlich werden wahlweise die nachfolgend erörterten Additive zugegeben. Die Wahl des geeigneten Lösungsmittels bzw. Dispersionsmittels hängt von der Art des herangezogenen Bindemittels ab. Hierzu zählen insbesondere niedrig- bis mittelsiedende organische Lösemittel aus der Gruppe der Alkohole, wie Ethanol, Isopropanol und Butanol, der Ketone, wie Aceton und Methylethylketon, der Ester, wie Methyl- und Ethylacetat, der aromatischen Kohlenwasserstoffe, wie Toluol, der aliphatischen Kohlenwasserstoffe, wie Benzin des Siedebereichs von 70 bis 140°C, allein oder im Gemisch, aber insbesondere Wasser, allein oder in Gemisch mit niedrig-siedenden, wasserlöslichen organischen Lösemitteln.To form the transfer layer, the binder selected in each case is preferably in the form of an aqueous solution or dispersion. In addition, the additives discussed below are optionally added. The choice of the suitable solvent or dispersing agent depends on the type of binder used. These include, in particular, low to medium-boiling organic solvents from the group of alcohols, such as ethanol, isopropanol and butanol, the ketones, such as acetone and methyl ethyl ketone, the esters, such as methyl and ethyl acetate, the aromatic hydrocarbons such as toluene and the aliphatic hydrocarbons, such as gasoline in the boiling range of 70 to 140 ° C, alone or in a mixture, but especially water, alone or in a mixture with low-boiling, water-soluble organic solvents.
Die Konzentration des Bindemittels in der Lösung bzw. Dispersion ist nicht erfindungswesentlich. Als grobe Richtlinie kann gelten, daß sie zwischen etwa 3 und 15 Gew.- % liegt, wobei der Bereich von etwa 6 bis 12 Gew.- % bevorzugt ist. Die Lösung bzw. Dispersion wird zur Ausbildung der Ubertragungsschicht vorzugsweise in einer Menge von etwa 15 bis 25 g/m2 (Trockengewicht) und ganz besonders bevorzugt zwischen etwa 18 und 22 g/m auf den Hilfsträger aufgetragen.The concentration of the binder in the solution or dispersion is not essential to the invention. A rough guideline can be that it is between about 3 and 15% by weight, the range of about 6 to 12% by weight being preferred. To form the transfer layer, the solution or dispersion is preferably applied to the auxiliary carrier in an amount of about 15 to 25 g / m 2 (dry weight) and very particularly preferably between about 18 and 22 g / m.
Ein vorteilhafter Bestandteil der bindemittelhaltigen Ubertragungsschicht ist ein "Abrißhilfsmittel". Beim Aufbringen der Ubertragungsschicht auf ein Substrat unter Zugspannungsbedingungen erfolgt hierdurch ein sauberer Abriß. Als Abrißhilfsmittel kommen Cellulosederivate in Frage. Besonders bevorzugte Cellulosederivate sind die in organischen Lösemitteln und/oder wasserlöslichen Celluloseether, wie Methyl-, Ethyl-, Hydroxyethyl-, Ethylhydroxyethyl- und Carboxymethylcellulosen, Celluloseester, wie Celluloseacetobutyrat und -propionat. Es sind auch vielfältige andere lösliche Cellulosederivate geeignet, die die gewünschten Effekte bewirken. Offenbar ist das Cellulosegrundgerüst in dem löslichen Cellulosederivat wichtig, während die durch die Cellulosemodifizierung eingeführten Gruppen lediglich zur Erhöhung der Löslichkeit im gewählten Lösungsmittel führen.An advantageous component of the binder-containing transfer layer is a "tear-off aid". When the transfer layer is applied to a substrate under tensile stress conditions, this results in a clean tear-off. Cellulose derivatives can be used as a tear-off aid. Particularly preferred cellulose derivatives are those in organic solvents and / or water-soluble cellulose ethers, such as methyl, ethyl, hydroxyethyl, ethylhydroxyethyl and carboxymethyl celluloses, cellulose esters, such as cellulose acetobutyrate and propionate. Various other soluble cellulose derivatives are also suitable, which bring about the desired effects. The cellulose backbone in the soluble cellulose derivative is apparently important, while the groups introduced by the cellulose modification only lead to an increase in the solubility in the chosen solvent.
Zur optimalen Ausbildung der Ubertragungsschicht liegt ein Mengenverhältnis von Abrißhilfsmittel zu Bindemittel von etwa 1:2 bis 1:20 zugrunde, wobei der Bereich von etwa 1 :4 bis 1: 10 bevorzugt ist. Die Haftkleberschicht kann aus handelsüblichen Haftklebstoffen bestehen. Dies sind elastische und dauernd klebfähige Selbstklebemassen mit großen Adhäsionskräften, die bereits unter geringem Druck bei Raumtemperatur auf den verschiedenen Oberflächen sofort haften. Sie werden vorzugsweise in wäßriger Dispersion auf die sich bereits auf dem Hilfsträger befindliche Ubertragungsschicht und gegebenenfalls Zwischenschicht aufgetragen, da so die bereits ausgebildeten Schichten nicht wieder aufgelöst werden. Unter Haftklebstoffen dieser Art sind inbesondere solche auf Acrylatbasis vorteilhaft. Bei den Ausgangsmaterialien kann es sich um viskose Lösungen und Dispersionen handeln, die auf Kautschuk, Polyacrylaten, Polyvinylethern bzw. Polyvinylisobutylen beruhen. Bevorzugt werden handelsübliche Materialien auf der Basis von Polyacrylaten. Geeignete Handelsprodukte sind Ucecryl 913 und Ucecryl PC 80 (vertrieben von der Firma ucb Dogenbos, Belgien) sowie die Kunststoffdispersion VP 959/6 (vertrieben von der Firma Freihoff). Vorzugsweise enthält der aufzubringende Haftklebstoff, der zunächst in einem wäßrigen Medium vorliegt, Netzmittel bzw. Tenside (vertrieben unter der Handelsbezeichnung Byk W). In die aufzubringende Lösung oder Dispersion des Haftklebstoffs wird in der Ausführungsform b) der Erfindung ein nicht-weißes Pigment in fein-disperser Verteilung einbezogen. Die Dispersion/Lösung des Haftklebstoffs, gegebenenfalls mit Zusätzen, wird zur Ausbildung der Haftkleberschicht vorzugsweise in einer Menge von etwa 1 bis 5 g/m (Trockengewicht) und ganz besonders bevorzugt in einer Menge von etwa 2 bis 4 g/m auf die Ubertragungsschicht bzw. Zusatzschicht aufgetragen.For the optimal formation of the transfer layer, a quantitative ratio of demolition aid to binder is based on about 1: 2 to 1:20, the range of about 1: 4 to 1:10 being preferred. The pressure sensitive adhesive layer can consist of commercially available pressure sensitive adhesives. These are elastic and permanently adhesive self-adhesive compositions with high adhesive forces that adhere immediately to the various surfaces even under low pressure at room temperature. They are preferably applied in aqueous dispersion to the transfer layer and, if appropriate, the intermediate layer already on the auxiliary carrier, since the layers which have already been formed are not dissolved again. Among pressure-sensitive adhesives of this type, those based on acrylate are particularly advantageous. The starting materials can be viscous solutions and dispersions based on rubber, polyacrylates, polyvinyl ethers or polyvinyl isobutylene. Commercial materials based on polyacrylates are preferred. Suitable commercial products are Ucecryl 913 and Ucecryl PC 80 (sold by ucb Dogenbos, Belgium) and the plastic dispersion VP 959/6 (sold by Freihoff). The pressure-sensitive adhesive to be applied, which is initially present in an aqueous medium, preferably contains wetting agents or surfactants (sold under the trade name Byk W). In embodiment b) of the invention, a non-white pigment in a finely dispersed distribution is included in the solution or dispersion of the pressure-sensitive adhesive to be applied. The dispersion / solution of the pressure sensitive adhesive, optionally with additives, is preferably applied to the transfer layer or, respectively, in an amount of approximately 1 to 5 g / m 2 (dry weight) and very particularly preferably in an amount of approximately 2 to 4 g / m 2 to form the pressure sensitive adhesive layer Additional layer applied.
Im Rahmen der Erfindung ist die Haftkleberschicht vorzugsweise etwa 1 bis 5 μm, insbesondere etwa 2 bis 4 μm stark. Der gleiche Rahmen gilt für die erwähnte kunststoffgebundene Zwischenschicht nach der Ausgestaltung a). Die weißpigmentierte Ubertragungsschicht ists vorzugsweise 15 bis 25 μm, insbesondere ewta 18 bis 22 μm stark. Ein Unterschreiten der unteren Angaben würde zum Auftreten von Schwierigkeiten bei der Herstellung führen bzw. die Funktionalität der jeweiligen Schicht beeinträchtigen. Ein Überschreiten der Grenzwerte würde keine nennenswerte Verbesserung bieten und auch einen unnötigen Kostenaufwand bedeuten. Zum anderen ist ein dickeres Band auch nicht gleichermaßen vorteilhaft in einem Handgerät zu benutzen, da durch das vorgegebene Volumen der Kassette bei zu starker Dicke ein Verlust an Bandlänge in Kauf genommen werden müßte.In the context of the invention, the pressure-sensitive adhesive layer is preferably about 1 to 5 μm, in particular about 2 to 4 μm thick. The same framework applies to the above-mentioned plastic-bonded intermediate layer after configuration a). The white-pigmented transmission layer is preferably 15 to 25 μm, in particular 18 to 22 μm thick. Falling short of the information below would lead to difficulties in production or impair the functionality of the respective layer. Exceeding the limit values would not offer any appreciable improvement and would also mean unnecessary costs. On the other hand, a thicker tape is also not equally advantageous to use in a hand-held device, since a loss of tape length would have to be accepted due to the given volume of the cassette if the thickness is too thick.
Bei den Bindemitteln zur Kunststoffbindung der Zwischenschicht unterliegt die vorliegende Erfindung keinen wesentlichen Einschränkungen. Bei der Ausgestaltung al) können diejenigen Bindemittel herangezogen werden, die bereits beim Aufbau der weißpigmentierten Ubertragungsschicht herangezogen wurden. Bei der Ausgestaltung a2) können sogar diejenigen Bindemittel bzw. Kunststoffe genutzt werden, die Bestandteil der Haftkleberschicht sind. Diesbezüglich sei auf die vorausgehenden Ausführungen verwiesen.The present invention is not subject to any significant restrictions in the case of binders for binding the intermediate layer with plastics. In the embodiment a1), those binders can be used which were already used when the white-pigmented transfer layer was built up. In the configuration a2) it is even possible to use those binders or plastics that are part of the pressure-sensitive adhesive layer. In this regard, reference is made to the preceding explanations.
Der Hilfsträger des erfindungsgemäßen Übertragungsbandes besteht vorzugsweise aus einer Kunststoffolie, wie sie bei den Trägern von Schreibmaschinenbändern üblicherweise herangezogen wird, so z.B. aus Polyethylenterephthalat, Polypropylen, Polyethylen, Polyvinylchlorid oder Polycarbonat. Auch silikonbeschichtetes Papier hat sich als Hilfsträger als geeignet erwiesen. Die Silikonbeschichtung führt zu einer Verringerung der Haftspannung zwischen der bindemittelhaltigen Ubertragungsschicht und dem Hilfsträger. Sie kann durch andere Antihaftmittel ersetzt werden, wie beispielsweise durch Polytetrafluorethylen.The auxiliary carrier of the transfer belt according to the invention preferably consists of a plastic film, as is usually used for the carriers of typewriter ribbons, e.g. made of polyethylene terephthalate, polypropylene, polyethylene, polyvinyl chloride or polycarbonate. Silicone-coated paper has also proven to be suitable as an auxiliary carrier. The silicone coating leads to a reduction in the adhesive tension between the binder-containing transfer layer and the auxiliary carrier. It can be replaced by other non-stick agents such as polytetrafluoroethylene.
Der Hilfsträger hat vorzugsweise eine Stärke von etwa 10 bis 16 μm, insbesondere von etwa 15 bis 55 μm.The auxiliary carrier preferably has a thickness of approximately 10 to 16 μm, in particular approximately 15 to 55 μm.
Die oben beschriebenen Materialien der einzelnen Schichten des erfindungsgemäßen Übertragungsbandes genügen in der Regel der Grundforderung, daß im Falle der Ausgestaltung a) die geringste im Schichtverbund Übertragungsschicht/Zwischen- schicht/Haftkleberschicht auftretende Haftspannung (definiert über die Adhäsionsarbeit entsprechend der Dupre'schen Gleichung, Lit. : K.L. Wolf "Physik und Chemie der Grenzflächen", Springer Verlag 1957, S. 164) bzw. im Falle der Ausgestaltung b) die Haftspannung zwischen der Ubertragungsschicht und der Haftkleberschicht größer als die zwischen dem Hilfsträger und der Ubertragungsschicht auftretende Haftspannung ist. Sollte das im Einzelfall nicht zutreffen, dann müßte eine geeignete Antihaftschicht auf den Hilfsträger aufgebracht werden, um diese Grundforderung zu erfüllen. Die auf dem Substrat ausgebildete Ubertragungsschicht sollte gegenüber anderen damit in Kontakt gelangenden Materialien, d.h. bei Berühren mit der Hand oder mit Papier nicht haftend sein. Somit lassen sich im Ergebnis folgende Haftspannungsverhältnisse zur erfolgreichen Verwendung des erfindungsgemäßen Übertragungsbandes angeben, wobei das Symbol "S" das Haftspannungsverhältnis zwischen den unterschiedlichen Materialien wiedergibt: S] Papier/Haftkleberschicht, S2 schwächste Bindung im Schichtverbund Übertragungsschicht/Zwischenschicht/Haftkleberschicht, S3 The materials of the individual layers of the transfer belt according to the invention described above generally meet the basic requirement that, in the case of configuration a), the lowest adhesive stress occurring in the layer composite of transfer layer / intermediate layer / pressure-sensitive adhesive layer (defined by the work of adhesion in accordance with Dupre's equation, ref .: KL Wolf "Physics and Chemistry of Interfaces", Springer Verlag 1957, p. 164) or, in the case of configuration b), the adhesive tension between the transfer layer and the pressure-sensitive adhesive layer is greater than the adhesive tension occurring between the auxiliary carrier and the transfer layer. If this is not the case in individual cases, then a suitable non-stick layer would have to be applied to the auxiliary carrier in order to meet this basic requirement. The transfer layer formed on the substrate should not be adhesive to other materials that come into contact with it, ie when touched by hand or with paper. As a result, the following adhesive tension ratios can be specified for the successful use of the transfer tape according to the invention, the symbol "S" representing the adhesive tension ratio between the different materials: S] paper / pressure-sensitive adhesive layer, S 2 weakest bond in the layered composite transfer layer / intermediate layer / pressure-sensitive adhesive layer, S 3
Übertragungsschicht/Hilfsträgers, S4 Übertragungsschicht/Papier und S5 Haftkleberschicht/ (Rückseite des) Hilfsträgers. Hierbei sind möglichst viele Beziehungen einzuhalten: Sj größer als S3, S2 größer als S3, S5 sehr viel kleiner als S2 und S5 kleiner als S3. Ferner sollte die freie Oberfläche der auf ein Substrat, insbesondere auf Papier, aufgetragenen Ubertragungsschicht nach außen möglichst keinerlei Haftvermögen zeigen, d.h. S4 ist dann Null bzw. strebt gegen Null. Ferner ist sichergestellt, daß bei Verwendung des erfindungsgemäßen Übertragungsbandes in aufgerollter Form in einem Handgerät die Haftkleberschicht zur Rückseite des Hilfsträgers eine Haftung aufweist, die kleiner ist als die geringste Haftung im Schichtverbund Übertragungsschicht/Zwischenschicht/Haftkleberschicht und kleiner ist als die Haftung zwischen der Ubertragungsschicht und dem Hilfsträger.Transfer layer / auxiliary carrier, S 4 transfer layer / paper and S 5 pressure-sensitive adhesive layer / (back of) auxiliary carrier. As many relationships as possible must be observed: Sj greater than S 3 , S 2 greater than S 3 , S 5 very much smaller than S 2 and S 5 less than S 3 . Furthermore, the free surface of the transfer layer applied to a substrate, in particular paper, should be outwardly as possible show no adherence, ie S 4 is then zero or tends towards zero. Furthermore, it is ensured that when the transfer tape according to the invention is rolled up in a handheld device, the pressure-sensitive adhesive layer has an adhesion to the back of the auxiliary carrier which is less than the lowest adhesion in the layered combination of transfer layer / intermediate layer / pressure-sensitive adhesive layer and less than the adhesion between the transfer layer and the subcarrier.
Bei der Verwendung des erfindungsgemäßen Übertragungsbandes bedient man sich vorteilhafterweise Auftragsgeräte, die ein Abrollen der mit dem Haftkleber versehenen Ubertragungsschicht bei gleichzeitigem Einzug des Hilfsträgers ermöglichen. Dies führt zu einer besonders leichten Handhabung des erfindungsgemäßen Übertragungsbandes. Dies können handelsübliche Handgeräte sein. Als ein hierfür besonders geeignetes Handgerät kann ein sogenannter "Handroller" eingesetzt werden, bei dem innerhalb eines griffgünstig gestalteten Gehäuses eine Vorratsspule mit dem Übertragungsband vorgesehen ist, von der aus es über einen aus dem Gehäuse vorstehenden Auftragsfuß geführt und von diesem wieder auf eine Aufwickelspule in das Gehäuse zurückgeleitet wird. Durch ein geeignetes Getriebe zwischen beiden Spulen im Gehäuse wird sichergestellt, daß das Übertragungsband stets ausreichend gespannt geführt wird. Der Benutzer nimmt zum Einsatz des Übertragungsbandes das Gehäuse in seine Hand und drückt mittels des Auftragsfußes die über dessen Endkante laufende äußere (ablösbare) Bandschicht gegen das Substrat, auf das sie übertragen werden soll (z.B. ein bedrucktes Blatt Papier, um Korrekturen vorzunehmen). Während des Andrückens bewegt der Benutzer das Gerät relativ zum Substrat und überträgt dabei z.B. eine deckende Schicht oder eine fluoreszierende Schicht auf das Substrat, wobei der flexible Hilfsträger von der Vorratsspule ab- und auf die Aufwickelspule aufgewickelt wird.When using the transfer tape according to the invention, use is advantageously made of applicators which enable the transfer layer provided with the pressure-sensitive adhesive to be rolled off while the auxiliary carrier is being drawn in at the same time. This leads to particularly easy handling of the transfer belt according to the invention. These can be standard handheld devices. A so-called "hand roller" can be used as a particularly suitable hand-held device, in which a supply spool with the transfer belt is provided within a housing with easy access, from which it is guided over an application foot protruding from the housing and from there again onto a take-up spool the housing is returned. A suitable gear between the two coils in the housing ensures that the transfer belt is always sufficiently tensioned. To use the transfer tape, the user takes the housing in his hand and uses the application foot to press the outer (removable) tape layer running over its end edge against the substrate to which it is to be transferred (e.g. a printed sheet of paper to make corrections). During pressing, the user moves the device relative to the substrate and transfers e.g. a covering layer or a fluorescent layer on the substrate, the flexible auxiliary carrier being unwound from the supply spool and wound onto the take-up spool.
Die mit der Erfindung verbundenen Vorteile erweisen sich im Ergebnis insbesondere darin, daß mit dem erfindungsgemäßen Übertragungsband eine merkliche Anhebung der Deckfähigkeit verbunden ist, ohne die Nachteile in Kauf nehmen zu müssen, die sich einstellen würden, wenn in der weißpigmentierten Ubertragungsschicht der Gehalt an abtönenden Pigmenten gesteigert würde. Ein überraschender Effekt wird auch bei bewußt abgetönten weißpigmentierten Übertragungsschichten erzielt, wenn die erfindungsgemäßen Lösungsmerkmale verwirklicht werden. Auch hier stellt sich eine unerwartete Anhebung der Deckfähigkeit ein.The advantages associated with the invention are particularly evident in the fact that the transfer belt according to the invention is associated with a noticeable increase in opacity without having to accept the disadvantages that would arise if the content of tinting pigments in the white-pigmented transfer layer would be increased. A surprising effect is also achieved with deliberately tinted white pigmented transfer layers if the solution features according to the invention are realized. Here too there is an unexpected increase in opacity.
Technologisch läßt sich die vorliegende Erfindung wie folgt erklären, ohne daß in diesen Erklärungen eine Bindung gesehen werden soll. Bei dem eingangs geschilderten Stand der Technik wird die Ubertragungsschicht ebenfalls bereits abgetönt. Die dabei erzielten Effekte lassen sich dadurch erklären, daß zwischen den relativ großen Weißpigmentteilchen, insbesondere Titandioxidteilchen, merkliche Hohlräume vorliegen, die einen merklichen Durchtritt von Lichtstrahlen bis auf die zu überdeckenden Schriftzeichen gestatten, so daß diese nicht vollständig abgedeckt werden und durchscheinen. Die angesprochenen Weißpigmente lassen sich nicht mit sinnvollem Arbeits- oder Produktionsaufwand in merklich kleinerer Teilchengröße herstellen. Anders verhält es sich hier beispielsweise mit Rußteilchen, deren Teilchen ohne weiteres in koloidaler Teilchengröße herstellbar sind. Durch das Abtönen der weißpigmentierten Ubertragungsschicht werden die kleineren Rußpartikel in den Hohlräumen mit der Folge angeordnet, daß der Durchtritt von Lichtstrahlen zumindest eingeschränkt wird. Einer Anhebung der Menge an Ruß sind Schranken gesetzt, da die weiß-pigmentierte Ubertragungsschicht in ihrem "Weißgrad" zunehmend stark beeinträchtigt wird. Es muß dem Fachmann nun im hohen Maße überraschen, daß bei Auslassen der angesprochenen Abtönung, jedoch bei Verwirklichung der erfindungsgemäßen Lösungsmerkmale a) und/oder b) nicht nur der wünschenswerte Weißgrad der weißpigmentierten Ubertragungsschicht weitgehend erhalten bleibt, sondern die Deckfähigkeit der Ubertragungsschicht in überraschend günstigem Maße angehoben wird. Dies wird einem Betrachter optisch ohne weiteres erkennbar. Die Möglichkeit, die Ubertragungsschicht dennoch in geringem Umfang abzutönen, bleibt unbenommen.Technologically, the present invention can be explained as follows, without any intention to be bound by these explanations. In the prior art described at the outset, the transmission layer is also already tinted. The achieved here Effects can be explained by the fact that there are noticeable cavities between the relatively large white pigment particles, in particular titanium dioxide particles, which allow a noticeable passage of light rays down to the characters to be covered, so that these are not completely covered and show through. The mentioned white pigments cannot be produced in a noticeably smaller particle size with sensible work or production effort. The situation is different here, for example, with soot particles, the particles of which can easily be produced in coloidal particle size. By tinting the white-pigmented transmission layer, the smaller soot particles are arranged in the cavities with the result that the passage of light rays is at least restricted. There are limits to an increase in the amount of soot, since the "white degree" of the white-pigmented transmission layer is increasingly severely impaired. It must now surprise the expert to a great extent that if the tinting mentioned is omitted, but when the solution features a) and / or b) according to the invention are implemented, not only is the desirable whiteness of the white-pigmented transfer layer largely retained, but the opacity of the transfer layer is surprisingly favorable Dimensions is raised. This is easily recognizable to a viewer. The possibility of tinting the transmission layer to a small extent remains unaffected.
Die Erfindung soll nachfolgend anhand eines Beispiels näher erläutert werden:The invention will be explained in more detail below using an example:
Beispiel 1example 1
Es wird folgende wäßrige Dispersion zur Ausbildung der weißpigmentierten Ubertragungsschicht hergestellt:The following aqueous dispersion is produced to form the white-pigmented transfer layer:
Wäßrige AcrylatdispersionAqueous acrylic dispersion
(25 % ig in Wasser / Handelsprodukt Worleecryl® 7712W der Firma Worlee Chemie GmbH, Hamburg) 23,42 Gew. -Teile(25% strength in water / commercial product Worleecryl 7712W ® from Worlee Chemie GmbH, Hamburg) 23.42 parts by wt.
Lactimon® WSLactimon ® WS
(Alkylammoniumsalze von Polycarbonsäuren und(Alkylammonium salts of polycarboxylic acids and
Polysiloxancopolymer) 0,8 Gew. -TeilePolysiloxane copolymer) 0.8 parts by weight
2-Butoxyethanol 1,5 Gew. -Teile Byk®-0342-butoxyethanol 1.5 parts by weight Byk ® -034
(Hydrophobe, silikonartige Komponenten in Mineralöl) 0,2 Gew. -Teile(Hydrophobic, silicone-like components in mineral oil) 0.2 parts by weight
Byk®-307Byk ® -307
(Polyethermodifiziertes Dimethylpolysiloxancopolymer) 0,02 Gew. -Teile Sorbit 5,00 Gew. -Teile(Polyether modified dimethylpolysiloxane copolymer) 0.02 part by weight Sorbitol 5.00 parts by weight
Kieselsäure 4,00 Gew. -TeileSilica 4.00 parts by weight
Titandioxid 35,00 Gew. -TeileTitanium dioxide 35.00 parts by weight
Elfenbeinschwarz 0,06 Gew. -Teile wäßrige Dispersion von feinen Hohlkugeln 30,00 Gew. -TeileIvory black 0.06 part by weight aqueous dispersion of fine hollow spheres 30.00 parts by weight
100,00 Gew. -Teile100.00 parts by weight
Die oben bezeichnete wäßrige Hohlkugeldispersion wird wie folgt hergestellt:The above-mentioned aqueous hollow sphere dispersion is prepared as follows:
800 Gew-Teile der im Handel erhältlichen Ropaque®-Emulsion Op-62 LO-E der Firma Rohm & Haas Company, Philadelphia, USA (bestehend aus einem nicht-filmbildenden Polymer eines effektiven Feststoffgehaltes von 52% sowie eines tatsächlichen Feststoffgehaltes von 37,5 % und eines pH-Wertes von 8,0 bis 8,7 (Teilchendurchmesser 0,4 μm, Innendurchmesser 0,28 μm) werden mit 176 Gew. -Teilen Wasser und 2 Gew.- Teilen eines Entschäumeradditivs (Byk® -034) (hydrophobe, silikonhaltige Komponenten in Mineralöl) und 22 Gew. -Teilen einer Ameisensäure-Lösung (hergestellt durch Vermischen von 100 Gew. -Teilen Ameisensäure konz. und 900 Gew. -Teilen Wasser) gemischt. Von dieser angesäuterten Dispersion werden in der obigen Rezeptur 30 Gew.- Teile eingesetzt.800 parts by weight of the Ropaque commercially available ® emulsion Op-62 LO-E Rohm & Haas Company, Philadelphia, USA (consisting of a non-film-forming polymer of an effective solid content of 52% and an actual solids content of 37.5 % and a pH of 8.0 to 8.7 (particle diameter 0.4 μm, inner diameter 0.28 μm) are mixed with 176 parts by weight of water and 2 parts by weight of a defoamer additive (Byk ® -034) ( hydrophobic, silicone-containing components in mineral oil) and 22 parts by weight of a formic acid solution (produced by mixing 100 parts by weight of concentrated formic acid and 900 parts by weight of water). 30 of this acidified dispersion are mixed in the above formulation Parts by weight used.
Die vorstehende Abdeckmasse wird mit einer Rakel in einer Menge von 18 g/m auf einen silikonisierten Papierträger aufgetragen. Dann wird das Wasser bei etwa 80°C durch Überleiten warmer Luft abgedampft.The above masking compound is applied with a doctor knife in an amount of 18 g / m 2 onto a siliconized paper carrier. Then the water is evaporated at about 80 ° C by passing warm air over it.
Anschließend wird eine wäßrige Dispersion, die aus folgenden Bestandteilen besteht, mit einer Rakel auf die Oberfläche der Ubertragungsschicht aufgetragen.An aqueous dispersion consisting of the following constituents is then applied to the surface of the transfer layer using a doctor blade.
Wasser 30,5 Gew. -TeileWater 30.5 parts by weight
Colanylschwarz PR 130Colanyl black PR 130
(von der Firma Hoechst AG)(from Hoechst AG)
(Gehalt etwa 30 % Ruß,(Content about 30% soot,
Rest Wasser und Dispergiermittel = Teig) 0,5 Gew. -TeileBalance water and dispersant = dough) 0.5 parts by weight
Kunststoffdispersion VP 859/6Plastic dispersion VP 859/6
(50 %ig Acrylat-Haftkleber) (Hersteller: Firma Freihof) 67,00 Gew. -Teile 25 %iger Ammoniak 2,00 Gew. -Teile(50% acrylic adhesive) (manufacturer: Freihof) 67.00 parts by weight 25% ammonia 2.00 parts by weight
100,00 Gew.Teile100.00 parts by weight
Beispiel 2Example 2
Beispiel 1 wurde wiederholt, außer daß für die Haftschicht folgende Rezeptur verwendet wurde:Example 1 was repeated, except that the following recipe was used for the adhesive layer:
Wasser 28,00 Gew. -TeileWater 28.00 parts by weight
Aquasilber Aluminiumpaste LPW/1380 (Hersteller: Carl Schlenk AG, 65 % Aluminiumgehalt, 35 % Wassergehalt) Teilchengröße: 9 μm (im Durchschnitt 50,3 % der Teilchen) 5,00 Gew. -TeileAquasilver aluminum paste LPW / 1380 (manufacturer: Carl Schlenk AG, 65% aluminum content, 35% water content) Particle size: 9 μm (on average 50.3% of the particles) 5.00 parts by weight
Lactimon WS 0,50 Gew.-TeileLactimon WS 0.50 parts by weight
Kunststoffdispersion VP 859/6 65,00 Gew.-TeilePlastic dispersion VP 859/6 65.00 parts by weight
25 %iger wäßriger Ammoniak 1 ,50 Gew.-Teile25% aqueous ammonia 1.50 parts by weight
100,00 Gew.-Teile 100.00 parts by weight

Claims

Patentansprüche claims
1. Mehrschichtiges, flexibles Ubertragungsband mit einem Hilfsträger und einer Haftkleberschicht, wobei zwischen dem Hilfsträger und der Haftkleberschicht eine bindemittelhaltige weißpigmentierte Ubertragungsschicht, die zur Haftkleberschicht eine stärkere Haftung als zum Hilfsträger aufweist, vorliegt, dadurch gekennzeichnet, daß a) in einer kunststoffgebundenen Zwischenschicht, die sich al zwischen der weißpigmentierten Ubertragungsschicht und der Haftkleber¬ schicht oder a2) in der weißpigmentierten Ubertragungsschicht befindet, und/oder b) in der Haftkleberschicht ein nicht-weißes Pigment in fein-disperser Verteilung enthalten ist.1. Multi-layer, flexible transfer tape with an auxiliary carrier and a pressure-sensitive adhesive layer, wherein between the auxiliary carrier and the pressure-sensitive adhesive layer there is a binder-containing white pigmented transfer layer which has a stronger adhesion to the pressure-sensitive adhesive layer than to the auxiliary carrier, characterized in that a) in a plastic-bound intermediate layer, the there is al between the white-pigmented transfer layer and the pressure-sensitive adhesive layer or a2) in the white-pigmented transfer layer, and / or b) a non-white pigment in finely dispersed distribution is contained in the pressure-sensitive adhesive layer.
2. Ubertragungsband nach Anspruch 1 , dadurch gekennzeichnet, daß die Zwischenschicht und/oder die Haftkleberschicht mindestens etwa 0, 1 Gew.- % nicht¬ weißes Pigment enthält.2. Transfer belt according to claim 1, characterized in that the intermediate layer and / or the pressure-sensitive adhesive layer contains at least about 0.1% by weight of non-white pigment.
3. Ubertragungsband nach Anspruch 2, dadurch gekennzeichnet, daß die Zwischen¬ schicht und/oder die Haftkleberschicht etwa 0,1 bis 5 Gew.-%, insbesondere etwa 0,2 bis 3,5 Gew.-%, nicht-weißes Pigment enthalten.3. Transfer belt according to claim 2, characterized in that the intermediate layer and / or the pressure-sensitive adhesive layer contain about 0.1 to 5% by weight, in particular about 0.2 to 3.5% by weight, of non-white pigment .
4. Ubertragungsband nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Ubertragungsschicht als Weißpigment feinteiliges Titandioxid enthält.4. Transfer belt according to one of claims 1 to 3, characterized in that the transfer layer contains finely divided titanium dioxide as a white pigment.
5. Ubertragungsband nach mindestens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das nicht-weiße Pigment ein Schwarzpigment ist.5. Transfer belt according to at least one of the preceding claims, characterized in that the non-white pigment is a black pigment.
6. Ubertragungsband nach Anspruch 5, dadurch gekennzeichnet, daß das Schwarz¬ pigment Ruß ist.6. Transfer belt according to claim 5, characterized in that the Schwarz¬ pigment is carbon black.
7. Ubertragungsband nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das nicht-weiße Pigment feinteiliges Aluminium ist. 7. Transfer belt according to one of claims 1 to 4, characterized in that the non-white pigment is finely divided aluminum.
8. Ubertragungsband nach mindestens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Zwischenschicht a) etwa 1 bis 5 μm, insbesondere etwa 2 bis 4 μm, stark ist.8. Transfer belt according to at least one of the preceding claims, characterized in that the intermediate layer a) is approximately 1 to 5 μm, in particular approximately 2 to 4 μm, thick.
9. Ubertragungsband nach mindestens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die weißpigmentierte Ubertragungsschicht etwa 15 bis 25 μm, insbesondere etwa 18 bis 22 μm, stark ist.9. Transfer belt according to at least one of the preceding claims, characterized in that the white pigmented transfer layer is approximately 15 to 25 μm, in particular approximately 18 to 22 μm, thick.
10. Ubertragungsband nach mindestens einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die Haftkleberschicht b) etwa 1 bis 5 μm, insbesondere etwa 2 bis 4 μm, stark ist.10. Transfer belt according to at least one of the preceding claims, characterized in that the pressure-sensitive adhesive layer b) is approximately 1 to 5 μm, in particular approximately 2 to 4 μm, thick.
11. Verwendung des Übertragungsbandes nach mindestens einem der vorhergehenden Ansprüche in aufgerollter Form in einem Handgerät. 11. Use of the transmission tape according to at least one of the preceding claims in rolled up form in a hand-held device.
EP97906154A 1996-05-03 1997-03-03 Flexible, multilayered transfer tape Expired - Lifetime EP0896556B1 (en)

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DE19617850 1996-05-03
DE19617850A DE19617850C1 (en) 1996-05-03 1996-05-03 Multilayered flexible transfer strip with auxiliary support and pressure sensitive adhesive layer
PCT/EP1997/001050 WO1997042036A1 (en) 1996-05-03 1997-03-03 Flexible, multilayered transfer tape

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AU717828B2 (en) 2000-04-06
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CN1169676C (en) 2004-10-06
PT896556E (en) 2002-01-30
ES2161441T3 (en) 2001-12-01
US20020064632A1 (en) 2002-05-30
ATE203461T1 (en) 2001-08-15
GR3036402T3 (en) 2001-11-30
CA2253630A1 (en) 1997-11-13
EP0896556B1 (en) 2001-07-25

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