Classifications

• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
  • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
  • G09F3/02—Forms or constructions
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
  • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
  • G09F3/08—Fastening or securing by means not forming part of the material of the label itself
  • G09F3/10—Fastening or securing by means not forming part of the material of the label itself by an adhesive layer
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
  • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
  • G09F3/02—Forms or constructions
  • G09F2003/023—Adhesive
  • G09F2003/0242—Adhesive soluble in water
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
  • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
  • G09F3/02—Forms or constructions
  • G09F2003/023—Adhesive
  • G09F2003/0244—Adhesive soluble in chemicals
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
  • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
  • G09F3/02—Forms or constructions
  • G09F2003/0255—Forms or constructions laminated
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
  • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
  • G09F3/02—Forms or constructions
  • G09F2003/0257—Multilayer
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
  • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
  • G09F3/02—Forms or constructions
  • G09F2003/0257—Multilayer
  • G09F2003/0258—Multilayer without carrier

Definitions

• the present invention relates to an activatable adhesive label comprising a sheet-like visible material, with at least one adhesive layer made of a moisture-activatable adhesive that is non-sticky in the dry state being applied to one side of the flexible visible material.
• adhesive laminates are used, for example, as labels, but also as adhesive tapes, in particular for logistics applications, but also for conventional ones Label applications used for decorating, marking and sealing.
• Labels usually consist of a visible material that is provided with a print and an adhesive layer (adhesive layer).
• these labels also have a removable layer (e.g. siliconized liner) which covers the adhesive layer on the side facing away from the visible material.
• This additional layer serves to prevent the labels from sticking to the next layer of the visible material, for example if they are in roll form.
• the disadvantage here is that an additional layer of material is necessary due to the additional layer and, moreover, that this layer has to be disposed of after it has been removed from the adhesive layer. In particular when automated labeling is provided, this additional layer poses additional problems and demands on production.
• the EP 2 924 088 A1 a so-called “linerfree” or “linerless” label and an adhesive composition are used for this, with two different hydrophilic polymer materials being present in the adhesive composition and one providing rapid initial adhesion when activated with a fluid when it comes into contact with the activation fluid , and the second, more hydrophobic polymer component then provides the final adhesion.
• the invention solves this problem by an activatable adhesive label with the features of claim 1, in which at least one middle layer is provided between the visible material and the adhesive layer, which is not pressure-sensitive, water-soluble or swellable. Further preferred configurations are set out in the subclaims.
• a second middle layer is provided, which is designed to be pressure-sensitive, preferably at room temperature.
• This layer serves to improve the grip adhesion, that is to say the first adhesion between a substrate and the adhesive label, and at the same time the final adhesion is also improved by a dissipative component.
• first and / or second middle layer reduce the risk of the adhesive layer and the visible material separating, in particular in the affixed or applied state.
• the visible material is preferably provided directly adjacent to the second middle layer if one is provided without further non-pressure-sensitive or pressure-sensitive adhesive layers being provided in between.
• the first middle layer is preferably directly adjacent to the adhesive layer.
• it is a three-layer adhesive structure and a visible material preferably connected to it.
• the visible material consists of a paper material or a film material.
• the visible material can in particular also consist of multilayer paper or film materials, in particular paper or film laminates.
• Particularly suitable film materials are polyethylene, polypropylene or PET films.
• the thickness of the film can preferably be 5 to 250 ⁇ m, preferably 10 to 200 ⁇ m and more preferably 15 to 180 ⁇ m.
• the foils are in particular foils that can be printed using conventional printing processes. Paper can also be used as the visible material, the thickness of the visible material layer being preferably 5 to 250 ⁇ m, preferably 15 to 200 ⁇ m and more preferably 40 to 100 ⁇ m when using paper.
• the papers are in particular also papers that can be printed using conventional methods.
• the adhesive layer are materials which contain an adhesive (adhesive system) or an adhesive that can be activated to an adhesive state by the action of moisture or water, ie water in the liquid or vapor state.
• the adhesive layer is non-sticky in the dry state, in particular not pressure-sensitive adhesive, and can be activated by adding water or steam or alternatively another fluid in the liquid or vapor state so that the adhesive layer is converted into an adhesive state. After the fluid has evaporated, the adhesive layer is again non-adhesive. The layer is not water-soluble.
• the fluid can optionally be tempered in order to achieve a faster reaction time and thus a faster processing of the activatable adhesive label, that is to say adhesion to a substrate.
• the layer is preferably film-forming, but not pressure-sensitive adhesive.
• the thickness of the adhesive layer can preferably be 1 to 50 ⁇ m, more preferably 3 to 20 ⁇ m and more preferably 5 to 15 ⁇ m.
• the non-adhesive properties in the dry state are preferably present at room temperature.
• Room temperature should be understood to mean 23 ° C and, under room conditions, preferably a relative humidity of 50%.
• the adhesive for the adhesive layer can preferably be selected from the group of polyvinyl acetates, ethylene vinyl acetates, glutin and starch derivatives (dextrin), polyvinyl alcohols and combinations thereof.
• the adhesive layer can contain additives such as colloids or other additives such as e.g. contain surface-active substances, as well as crosslinking agents or the like.
• the Dahlquist criterion should be used to determine the “pressure-sensitive adhesive” criterion for the first and / or second middle layer. That is, layers are considered to be pressure-sensitive adhesive and at a value below 3 ⁇ 10 5 Pa considered non-pressure sensitive above this value.
• room temperature 23 ° C
• a deformation rate of 1 Hz should be used.
• the Dahlquist criterion results from: " Dillard DA et al, Adhesion Science and Engeneering: Surfaces, Chemistry and Applications, Elsevier Science BV, first edition 2002 "(ISBN: 0444511407 ).
• a pressure-sensitive adhesive middle layer made of an adhesive this also includes designs in which the pressure-sensitive adhesive middle layer does not consist of 100% adhesive and also designs in which the pressure-sensitive adhesive middle layer comprises several adhesives, the middle layer as such being adhesive, in particular pressure-sensitive adhesive Should have properties.
• the second middle layer is designed to be pressure-sensitive adhesive according to the Dahlquist criterion, whereas the first middle layer is not pressure-sensitive adhesive according to this criterion.
• a layer which is between 1 and 30 ⁇ m, preferably between 2 and 20 ⁇ m and more preferably between 4 and 15 ⁇ m thick can preferably be used as the second middle layer.
• the second middle layer also serves to improve the rheological properties of the activatable adhesive label and to provide a better connection between the adhesive layer and a substrate to be glued.
• the first middle layer is preferably between 1 and 30 ⁇ m, in particular between 1 and 20 ⁇ m and in particular between 4 and 8 ⁇ m thick.
• the glass transition temperature Tg of the first and / or second middle layer is below the application temperature, in particular in the range ⁇ 0 ° C, preferably ⁇ -5 ° C and more preferably ⁇ -10 ° C, wherein the lower limit is -100 ° C, preferably -80 ° C and more preferably -65 ° C, so that a preferred application range of the glass transition temperature between -10 and -65 ° C results.
• the glass transition temperature of the polymers of the middle layer can be determined by the usual methods such as differential thermal analysis or differential scanning calometry, e.g. according to ASTM 3418/82, so-called "midpoint temperature".
• the glass transition temperature gives an indication of the deformability and thus of the ability and speed with which the contact surface between the layers can be formed and thus makes a statement about the tack (grip) and the final adhesion.
• the measurable touch adhesion is> 1 N, the measurement with 15 g / m 2 dry application on polyester film with a thickness of 30 ⁇ m according to FTM 9 ( FINAT Technical Handbook 9th Editi on) has occurred.
• the materials of the non-pressure-sensitive adhesive first middle layer can preferably be (poly) acrylates, Polyurethanes, Ethylenvinylactetate, Polyvinylactete in "pure” form or post-crosslinked materials can be used via suitable crosslinkers.
• Suitable pressure-sensitive adhesives for the second middle layer are preferably systems that are pressure-sensitive at room temperature, such as radically polymerized polymers, polyesters or polyadducts, particularly preferably polymers obtainable by emission polymerization.
• Customary polymer compositions for acrylate dispersions are, for example, from DE 2 459 160 A1 , EP 0 625 557 B1 as EP 0 952 199 known, the disclosure of which is made the subject of the present invention.
• PSA Pressure Sensitive Adhesives
• silicone-based or polyurethane-based pressure-sensitive adhesive systems can also be used.
• the second middle layer can contain further additives in addition to the pressure-sensitive adhesive polymer, wherein here in particular tackifying resins (so-called tackifiers) and reactive components, such as external crosslinkers.
• tackifying resins so-called tackifiers
• reactive components such as external crosslinkers.
• the second middle layer consists exclusively of one or more pressure-sensitive adhesive polymers, it also being possible to use a number of pressure-sensitive adhesive polymers in combination.
• first and / or second middle layer with multiple layers.
• all of the layers of the first middle layer and of the second middle layer are preferably designed to be pressure-sensitive adhesive.
• the other layers such as, in particular, the moisture-activated adhesive layer, in particular for reasons of functionality or coatability and / or also the visible material, can be configured in multiple layers.
• a four-layer structure with exposed material, first and second middle layer and adhesive layer is preferred, with the individual layers being able to have one or more layers.
• no further layers are provided between the visible material and the adhesive layer, apart from the first or the two (first and second) middle layers.
• the activatable adhesive label can be made up in roll form as a linerless laminate. It can then be used as a type of adhesive tape or as a label (cut-to-size label) present in smaller units, with the assembly to the desired size preferably first takes place immediately prior to application on a substrate.
• a stack-shaped assembly is also possible. This involves punching or cutting, for example the final size of the labels to be used, or cutting the roll-shaped web material, the activatable adhesive label then being stored in a stack for further processing without additional intermediate layers.
• the visible material Preferably no anti-adhesive finish, e.g. provided or necessary by silicone, the visible material.
• the selection of possible visible materials can be increased and, for example, the printability can be improved.
• the adhesive layer is colored. This ensures that when applied and activated, some of the dyes penetrate into a substrate that is to be glued and discolor it. In a later manipulation attempt by detaching the adhesive label, either the substrate is destroyed or the discoloration of the adhered substrate becomes visible, which shows that a label or an adhesive tape according to the invention has already been applied at this point.
• the activatable adhesive label can be obtained by a coating process in which the first and / or the second middle layer and the adhesive layer are present and coated as an aqueous dispersion, solution, melt or liquid 100% system.
• One or both middle layers and the adhesive layer are preferably coated in one operation.
• a multiple cascade nozzle can be used for this.
• a coating method suitable for this is, for example, from U.S. 3,508,947 previously known, which in this respect is made the subject of the present invention.
• the multilayer laminate (activatable adhesive label) is preferably produced by a method in which the at least two flowable compositions are continuously coated onto a web-shaped substrate, preferably the visible material. The coating is carried out using a multiple cascade nozzle.
• the coating speed is preferably 30 to 1500 m / min, particularly preferably 150 to 1200 m / min and very particularly preferably 300 to 1000 m / min.
• the material layer for the first and / or second middle layer and the adhesive layer are fed separately as a liquid film into the coating device.
• An essential feature of the multiple cascade nozzle is that an overall film is formed from the individual films to be coated. In this overall film, the individual films are in the spatial arrangement as they are later desired in the multilayer laminate (adhesive label).
• the entire film is from the multiple cascade nozzle to the given moving web-shaped carrier.
• the method is preferably a slide coating method. With slide coating, the entire film slides over a surface, e.g. a metal surface (sliding) and is then placed on the substrate.
• the entire film is drawn directly from a slot or nozzle, i.e. without sliding, placed on the substrate.
• a curtain coating process In the curtain coating process, a free falling film curtain is placed on the substrate. In order for the film curtain to fall freely, the distance between the nozzle or other outlet opening and the moving substrate must be greater than the layer thickness to be coated. It is particularly preferably a slide coating process in combination with a curtain coating process.
• the coating can consist of the first and / or second middle layer and adhesive layer, but also in several operations, e.g. so one after the other. However, application in one operation is preferred.
• the multi-layer adhesive laminate (activatable adhesive label) is suitable as a label or label cut, adhesive film or adhesive tape.
• the overall structure of the adhesive label is preferably from 20 ⁇ m to 350 ⁇ m, preferably from 30 ⁇ m to 170 ⁇ m.
• Visible material standard vellum paper 70g / m 2
• First middle layer 10 gsm Encor 3130 (Arkema company)
• Adhesive layer 7gsm Eukalin 7427GG (company Eukalin)
• Such activatable adhesive e-labels are preferably used as logistics labels or adhesive tapes and for typical labels or adhesive tape applications for decorating, identifying or sealing.
• they can be used as a replacement for pre-assembled wet glue applications, e.g. are used for bottles, cans or other containers in which the labels are prefabricated into a label stack.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Engineering & Computer Science (AREA)
• Theoretical Computer Science (AREA)
• Adhesive Tapes (AREA)
• Adhesives Or Adhesive Processes (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

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Family Applications (1)

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Cited By (1)

Citations (9)

Family Cites Families (1)

• 2019
  • 2019-06-07 DE DE102019115574.6A patent/DE102019115574A1/de active Pending
• 2020
  • 2020-06-08 EP EP20178789.2A patent/EP3748613A1/fr active Pending

Patent Citations (9)

Non-Patent Citations (2)

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