US20110220295A1 - Pressure-sensitive adhesive strip for moisture-insensitive peelable adhesive bonds - Google Patents

Pressure-sensitive adhesive strip for moisture-insensitive peelable adhesive bonds Download PDF

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Publication number
US20110220295A1
US20110220295A1 US12/377,555 US37755507A US2011220295A1 US 20110220295 A1 US20110220295 A1 US 20110220295A1 US 37755507 A US37755507 A US 37755507A US 2011220295 A1 US2011220295 A1 US 2011220295A1
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adhesive
layer
core layer
adhesive strip
outer carrier
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Thorsten Krawinkel
Andreas Junghans
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Tesa SE
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Tesa SE
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Publication of US20110220295A1 publication Critical patent/US20110220295A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/04—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer characterised by a layer being specifically extensible by reason of its structure or arrangement, e.g. by reason of the chemical nature of the fibres or filaments
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/387—Block-copolymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B43/00—Operations specially adapted for layered products and not otherwise provided for, e.g. repairing; Apparatus therefor
    • B32B43/006—Delaminating
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C09J7/26—Porous or cellular plastics
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/29—Laminated material
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J153/00—Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers
    • C09J153/02—Vinyl aromatic monomers and conjugated dienes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J183/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Adhesives based on derivatives of such polymers
    • C09J183/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
    • C09J2301/124—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape
    • C09J2301/1242—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present on both sides of the carrier, e.g. double-sided adhesive tape the opposite adhesive layers being different
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/16—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer
    • C09J2301/162—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer the carrier being a laminate constituted by plastic layers only
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/302—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/304—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being heat-activatable, i.e. not tacky at temperatures inferior to 30°C
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/308—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive tape or sheet losing adhesive strength when being stretched, e.g. stretch adhesive
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2400/00—Presence of inorganic and organic materials
    • C09J2400/20—Presence of organic materials
    • C09J2400/24—Presence of a foam
    • C09J2400/243—Presence of a foam in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C09J2423/10—Presence of homo or copolymers of propene
    • C09J2423/105—Presence of homo or copolymers of propene in the release coating
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2453/00—Presence of block copolymer
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2467/00—Presence of polyester
    • C09J2467/006—Presence of polyester in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2483/00—Presence of polysiloxane
    • 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
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/11—Methods of delaminating, per se; i.e., separating at bonding face
    • Y10T156/1142—Changing dimension during delaminating [e.g., crushing, expanding, warping, 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
    • Y10T428/249921—Web or sheet containing structurally defined element or component
    • Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
    • Y10T428/249982—With component specified as adhesive or bonding agent
    • Y10T428/249983—As outermost component
    • 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
    • Y10T428/2848—Three or more layers

Definitions

  • the invention relates to an adhesive strip which is pressure-sensitively adhesive in particular on both sides and which can be detached again without residue or destruction in two steps, by extensional stretching in the bond plane and subsequent peeling.
  • the invention further relates to the use of the adhesive strip of the invention and also to methods of detaching the adhesive strip.
  • Strippable self-adhesive tapes of this kind are frequently used in the form of single-sidedly or double-sidedly pressure-sensitive adhesive-sheet strips, which preferably have a nonadhesive grip region, from which the detachment operation is initiated.
  • Fields of use of the aforementioned strippable pressure-sensitive adhesive strips include in particular the residuelessly and nondestructively redetachable fixing of light to moderately heavy articles in the home, workplace, and office segments. In these applications they replace conventional fastening means such as, for example, drawing pins, roundhead needles, thumb tacks, nails, screws, conventional self-adhesive tapes, and liquid adhesives.
  • Key to the successful use of the pressure-sensitive adhesive strips is not only the possibility of residueless and nondestructive redetachment of bonded articles but also their quick and easy bonding and also their secure hold for the envisioned period of bonding. It should be borne in mind in particular here that the adhesive strips must function on a large number of substrates in order to be able to serve as a universal fixing in the home, workplace, and office segments.
  • U.S. Pat. No. 6,569,521 B describes a redetachable adhesive strip with a strong, extensible carrier and an adhesive based on silicones, especially block copolymers of silicones and polyureas.
  • This product can be removed from the substrate again by pulling in the bond plane; the bond strength to glass at 98% relative humidity is increased significantly in relation to that of adhesives based on styrene block copolymers.
  • a disadvantage is that, owing to the stretching of the entire product, the only adhesives that can be used are those for which the bond strength is greatly reduced under extension.
  • Hydrophilic substrates possess the property of often having a very thin layer of adsorbed water bound on the surface, which can be removed only at very high temperatures. As a result of this thin layer of water, it is very easy for moisture or water to be picked up by the glass. Owing to the molecular structure of the glass, it is even capable of taking water into the glass itself and not only of absorbing it on the surface. Similar considerations apply to ceramic products too.
  • the layer of water between glass and adhesive strip may pick up further water, which causes the layer to grow. Water may also diffuse through the glass to the bond area. Consequently the bond performance is reduced to such an extent that it can lead to the bond failing.
  • silicone compositions can frequently be peeled effectively from the substrate to which they have been bonded.
  • the invention accordingly provides a redetachable, at least single-sidedly pressure-sensitive adhesive strip composed at least of the following layers:
  • the core layer is formed from an adhesive which is redetachable by extensional stretching especially in the bond plane.
  • the thickness of the core layer comprising the adhesive is preferably between 300 and 1500 ⁇ m.
  • the core layer protrudes beyond the outer carrier layer at least in one region.
  • This region serves as a grip tab, at which pulling takes place in order to obtain the extensional stretching especially in the bond plane of the core layer, and it is therefore preferably made non-adhesive on both sides, especially by the application of pieces of film, foil or paper.
  • the region can be generated by irradiation, powdering or neutralization of the adhesive.
  • a varnish or primer may be applied at the corresponding points.
  • the surface can then be modified by chemical treatment such as etching in order in each case to produce nonadhesive zones.
  • the adhesive of the core layer is constructed on the basis of styrene block copolymers.
  • Adhesives of this kind are described for example in DE 42 33 872 A1 or in DE 195 11 288 A1 and are available commercially as teas Powerstrips®.
  • the core layer is formed by a carrier which is redetachable by extensional stretching especially in the bond plane.
  • a further adhesive layer is applied at least sectionally on the side of the carrier that is opposite the side connected to the outer carrier layer.
  • a second adhesive layer which preferably has the same composition as the further adhesive layer.
  • the carrier protrudes beyond the outer carrier layer at least in one region.
  • This region serves again as a grip tab, on which adhering takes place in order to obtain the extensional stretching especially in the bond plane of the core layer.
  • the carrier is composed of foam, in particular of homopolymers and copolymers of ethylene, in particular of low-density and very low-density polyethylenes (LDPE, LLDPE, VLDPE), of ethylene-vinyl acetate copolymers and also of mixtures of aforementioned polymers and/or of films of polyvinyl acetates, polypropylenes, polyurethanes based on aromatic and aliphatic diisocyanates, polystyrene, impact-modified polystyrenes, PVC, acrylate copolymers.
  • LDPE low-density and very low-density polyethylenes
  • LLDPE low-density and very low-density polyethylenes
  • VLDPE very low-density polyethylenes
  • the foams can be employed in crosslinked or noncrosslinked form.
  • the thicknesses of the foams used are in particular between 175 ⁇ m and 10 mm, preferably between 250 ⁇ m and 5 mm, more preferably between 350 ⁇ m and 3 mm.
  • the densities may be 20 to 400 kg/m 3 , preferably 25 to 250 kg/m 3 , more preferably from 25 to 150 kg/m 3 .
  • the foam structure may be closed-cell, open-cell or mixed-cell. Skinned or unskinned foams of integral or nonintegral structure may be utilized. In accordance with the invention it is likewise possible to employ laminates of two or more foams.
  • Suitable pretreatment techniques include fluorine pretreatment, corona pretreatment, plasma pretreatment, and flame pretreatment, the latter in particular by means of an electrically polarized flame. Pretreatment methods may be applied alone or in combination. In the case of skinned foams and in the case of integral foams, the foam may be primer-treated in order further to improve the anchorage of adhesive. Open-cell and mixed-cell foams may be subjected to impregnation.
  • the foam carriers may be subjected to pretreatment or injury by means, for example, of perforating, cutting or punching. Such pretreatment may be carried out before or after the coating with adhesive.
  • the result of the pretreatment is, in particular, incisions in the foam-containing carrier, or the extraction of material from the foam-containing carrier, thereby reducing the mechanical strength of the carrier.
  • Examples of corresponding pretreatments are incisions, punches and perforations. These may cover the whole area of the foam-containing carriers or else be present in confined regions. They may have a regular structure and/or repetition sequence or be irregular.
  • the first adhesive layer is based on silicone and in particular is crosslinked. This achieves optimum bond strengths on hydrophilic substrates, even under humid and wet conditions.
  • the adhesive may be composed of a silicone-containing polymer and/or a silicone resin.
  • a silicone-containing polymer and/or a silicone resin.
  • blends of silicone resins and silicone rubbers and also reaction products of the two, through condensation crosslinking or addition crosslinking, for example.
  • Silicone polymers may be constructed on the basis of polydimethylsiloxanes or polydiphenylsiloxanes.
  • block copolymers of silicones and polyureas are also possible. These block copolymers may be obtained from polyorganosiloxanediamines and diisocyanates.
  • silanol-containing silicone polymers react with silanol-containing resins either by addition of a catalyst or as a result of increased temperature.
  • silicone polymers containing alkenyl groups are crosslinked with silicone resins containing either silicone-bonded hydrogen or alkenyl groups, through the use of platinum catalysts.
  • the silicone adhesives may comprise fillers or pigments, as elucidated in detail below.
  • a second outer carrier layer on the core layer and/or on the further adhesive layer which separates from the core layer or from the further adhesive layer when the latter is extensionally stretched, and which is preferably provided at least sectionally on the free side with a third adhesive layer.
  • the second outer carrier layer as well preferably has a maximum breaking extension of 120%, especially 80%.
  • the outer carrier layers separate therefrom, and there remain two single-sidedly bonded adhesive strips on the respective substrate, which can be peeled off.
  • outer carrier layer and the second outer carrier layer and/or the first and the third adhesive layers are identical.
  • the adhesive of the core layer, the further adhesive and/or the third adhesive are preferably composed of block copolymers or of a mixture thereof, especially including polymer blocks formed from vinyl aromatics (A blocks) and those formed by polymerization of 1,3-dienes (B blocks).
  • the vinyl aromatics are styrene and/or the B blocks are formed by polymerization of butadiene and/or isoprene and/or their hydrogenation products or by polymerization of isobutylene.
  • Resultant block copolymers may comprise identical or different B blocks, which may be hydrogenated partly, selectively or completely.
  • the block copolymers may have a linear A-B-A structure. It is likewise possible to employ block copolymers of radial design and also star-shaped and linear multiblock copolymers. A further component present may be A-B diblock copolymers. Block copolymers of vinyl aromatics and isobutylene can likewise be employed. All of the aforementioned polymers may be utilized alone or in a mixture with one another.
  • styrene-butadiene block copolymers and styrene-isoprene block copolymers and their hydrogenation products thus styrene-ethylene/butylene block copolymers and styrene-ethylene/propylene block copolymers
  • block copolymers and their hydrogenation products that utilize further polydiene-containing elastomer blocks, such as, for example, copolymers of two or more different 1,3-dienes.
  • Use may additionally be made of functionalized block copolymers, where the block copolymer is a maleic anhydride-modified or silane-modified styrene block copolymer
  • Typical use concentrations for the block copolymer are situated in a concentration in the range between 20% and 70% by weight, in particular in the range between 30% and 60% by weight and in the range of 35% and 55% by weight.
  • polymers present may be those based on pure hydrocarbons, for example, unsaturated polydienes such as naturally or synthetically generated polyisoprene or polybutadiene, substantially chemically saturated elastomers such as, for example, a saturated ethylene-propylene copolymer, an ⁇ -olefin copolymer, a polyisobutylene, a butyl rubber, an ethylene-propylene rubber or a chemically functionalized hydrocarbon such as a halogen-containing, acrylate-containing or vinyl ether-containing polyolefin, which may replace the vinyl aromatic-containing block copolymers at up to about 100 phr (parts per hundred parts of resin), based on the styrene block copolymer.
  • unsaturated polydienes such as naturally or synthetically generated polyisoprene or polybutadiene
  • substantially chemically saturated elastomers such as, for example, a saturated ethylene-propylene copolymer, an ⁇ -
  • Adhesives based on natural rubber can also be employed.
  • the adhesive may be crosslinked by chemical means, in particular by radiation chemical means, as for example by UV irradiation, ⁇ irradiation or by irradiation using rapid electrons.
  • the adhesives of the present invention are optionally those whose pressure-sensitive adhesiveness is generated only by thermal or solvent activation.
  • the tackifier is a tackifier resin which is compatible with the elastomer block of the styrene block copolymers.
  • Suitable tackifier resins include, among others, preferably unhydrogenated, partially hydrogenated or fully hydrogenated resins based on rosin or on rosin derivatives, hydrogenated polymers of dicyclopentadiene, unhydrogenated, partially, selectively or fully hydrogenated hydrocarbon resins based on C 5 , C 5 /C 9 or C 9 monomer streams, polyterpene resins based on ⁇ -pinene and/or ⁇ -pinene and/or ⁇ -limonene, a hydrogenated polymer of pure C 8 or C 9 aromatics.
  • Aforementioned tackifier resins may be used both alone and in a mixture.
  • the mixture preferably comprises at least one additive.
  • additives may be primary or secondary antioxidants; primary antioxidants employed in particular include sterically hindered phenols, and secondary antioxidants employed in particular include phosphites or thiols. C-radical scavengers may be added.
  • light stabilizers such as, for example UV absorbers or sterically hindered amines.
  • the addition may likewise take place of antiozonants, metal deactivators, processing assistants or end block-reinforcing resins.
  • Plasticizing agents may be liquid resins, plasticizer oils or low molecular mass liquid polymers which possess a low molecular mass polyisobutylene having a molar mass ⁇ 1500 g/mol or a liquid EPDM (ethylene/propylene-diene terpolymer) type having a maximum proportion of 20% by weight.
  • Fillers such as, for example, silicon dioxide, glass (ground or in the form of beads), aluminum oxide, zinc oxide, calcium carbonate, titanium dioxide or carbon black, to name but a few, and also color pigments and dyes, and also optical brighteners, may likewise be used.
  • the outer adhesives in other words the first adhesive, the third adhesive layer if appropriate, the further adhesive, and the core layer, when the latter is composed of an adhesive, may be provided with an easy-release liner.
  • Suitable for lining the further adhesive and also the core layer is a paper or a film of siliconization; for the first or third adhesive, a fluorosiliconization is advisable.
  • the breaking extension measurements are made by a method based on DIN 53504, using dumbbell specimens of size S3 and a separation speed of 300 mm/min.
  • the adhesive strip of the invention can be used with outstanding effects to bond an article to a hydrophilic surface.
  • two substrates bonded with the adhesive strip of the invention can be separated by stretching the core layer in the direction of the bond plane, and doing so more particularly starting from the region which has been made nonadhesive, until the core layer from at least one of the outer carrier layers, so that the two substrates are separated from one another and on at least one of the two substrates an outer carrier layer is additionally bonded, and the outer carrier layer together with the first adhesive layer is peeled from the other substrate at an angle of removal of greater than 45°.
  • FIG. 1 shows the pressure-sensitive adhesive strip of the invention, wherein the core layer is composed of an adhesive
  • FIG. 2 shows the pressure-sensitive adhesive strip of the invention, wherein the core layer is composed of a carrier
  • FIG. 3 shows the pressure-sensitive adhesive strip of the invention, wherein the core layer is composed of an adhesive, and which has a second outer carrier layer,
  • FIG. 4 shows the pressure-sensitive adhesive strip of the invention, wherein the core layer is composed of a carrier, and which has a second outer carrier layer,
  • FIG. 5 shows how an article is bonded with an adhesive strip according to FIG. 1 to a hydrophilic substrate
  • FIG. 6 shows the first step in the method for detaching the article bonded with the pressure-sensitive adhesive strip
  • FIG. 7 shows the second step in the method for detaching the article bonded with the pressure-sensitive adhesive strip.
  • FIG. 1 the pressure-sensitive adhesive strip 10 of the invention is shown, wherein the core layer 1 is composed of an adhesive which is redetachable by extensional stretching especially in the bond plane.
  • the core layer 1 protrudes beyond the outer carrier layer 4 at least in a region which serves as a grip tab, which is pulled in order to obtain the extensional stretching especially in the bond plane of the core layer 1 .
  • This region is made non-adhesive on both sides by the application of preferably siliconized pieces of film, foil or paper 6 .
  • the outer carrier layer 4 is connected to the core layer 1 , owing to the adhesive character of said core layer 1 , in such a way that is separates from the core layer 1 when the latter is subjected to extensional stretching.
  • a first adhesive layer 5 Applied over the full area of the outer carrier layer 4 is a first adhesive layer 5 , in particular a pressure-sensitive silicone adhesive, specifically on the side opposite that connected to the core layer 1 .
  • FIG. 2 the pressure-sensitive adhesive strip 10 of the invention is shown, wherein the core layer 1 is composed of a carrier which is redetachable by extensional stretching especially in the bond plane.
  • the carrier 1 Connected to the carrier 1 is an outer carrier layer 4 , the connection being such that the layer 4 separates from the core layer 1 when the latter is subjected to extensional stretching.
  • the bond is ensured by a second adhesive layer 3 .
  • the further adhesive layer 2 is applied, and preferably has the same composition as the second adhesive layer 3 .
  • the bond strengths of the second adhesive layer 3 and of the further adhesive layer 2 can be reduced by extensional stretching especially in the bond plane.
  • FIG. 3 the pressure-sensitive adhesive strip 10 of the invention is shown, wherein the core layer 1 is composed of an adhesive which is redetachable by extensional stretching especially in the bond plane.
  • the core layer 1 protrudes beyond the outer carrier layer 4 at least in a region which serves as a grip tab, which is pulled in order to obtain the extensional stretching especially in the bond plane of the core layer 1 .
  • This region is made non-adhesive on both sides by the application of preferably siliconized pieces of film, foil or paper 6 .
  • the outer carrier layer 4 is connected to the core layer 1 , owing to the adhesive character of said core layer 1 , in such a way that it separates from the core layer 1 when the latter is subjected to extensional stretching.
  • a first adhesive layer 5 Applied over the full area of the outer carrier layer 4 is a first adhesive layer 5 , in particular a pressure-sensitive silicone adhesive, specifically on the side opposite that connected to the core layer 1 .
  • a second outer carrier layer 7 which separates from the core layer 1 when the latter is subjected to extensional stretching, and which is provided on the free side with a third adhesive layer 8 , in particular a pressure-sensitive silicone adhesive.
  • FIG. 4 the pressure-sensitive adhesive strip 10 of the invention is shown, wherein the core layer 1 is composed of a carrier which is redetachable by extensional stretching especially in the bond plane.
  • an outer carrier layer 4 Connected to the carrier 1 is an outer carrier layer 4 , the connection being such that the layer 4 separates from the core layer 1 when the latter is subjected to extensional stretching.
  • the bond is ensured by a second adhesive layer 3 , which preferably has the same composition as the further adhesive layer 2 .
  • a second outer carrier layer 7 which, on extensional stretching of the core layer 1 or of the further adhesive layer 3 , separates therefrom, and which is provided on the free side with a third adhesive layer 8 , in particular a pressure-sensitive silicone adhesive.
  • FIG. 5 shows how an article 11 is bonded with an adhesive strip 10 according to FIG. 1 to a hydrophilic substrate 12 .
  • the article 11 is a hook.
  • the first adhesive layer 5 in particular a pressure-sensitive silicone adhesive, is located on the substrate.
  • FIG. 6 shows the first step in the method for detaching the article 11 bonded with the pressure-sensitive adhesive strip 10 .
  • the stretching of the core layer 1 is continued until separation of the core layer 1 from the outer carrier layer 4 and from the article 11 is complete.
  • FIG. 7 shows the second step in the method for detaching the article 11 bonded with the pressure-sensitive adhesive strip 10 .
  • the outer carrier layer 4 To detach the outer carrier layer 4 , it is peeled, along with the first adhesive layer 5 , from the substrate 12 at an angle of removal of greater than 45°.
  • Residues of adhesive remain neither on the substrate 12 nor on the article 11 .
  • the preparation and processing of the adhesives may take place from solution and also from the melt. Fabrication from the melt has proven advantageous for the further adhesive and for the adhesive for forming the core layer, while fabrication from solution is preferred for the first and third adhesives.
  • Typical converted forms of the pressure-sensitive adhesive strips of the invention are adhesive-tape rolls and adhesive strips, of the kind obtained in the form of diecuts, for example.
  • all of the layers have essentially the shape of a rectangular block.
  • all of the layers are connected to one another over their full area.
  • adheresive tape encompasses all sheetlike structures such as two-dimensionally extended sheets or sheet sections, tapes with extended length and limited width, tape sections, diecuts, labels, and the like.
  • the ingredients are kneaded at 160° C. in a Sigma-blade mixer until homogeneous.
  • the resulting pressure-sensitive hot-melt adhesive is coated at 160° C. in a coat thickness of 410 ⁇ m from a slot die onto a double-sidedly siliconized release film 80 ⁇ m thick and composed of monoaxially oriented polypropylene.
  • the resulting bale product (consisting of double-sided pressure-sensitive adhesive tape with single-sided release-film liner) is processed to sheet product (adhesive strips) on a unit consisting of two laminating stations, a delaminating station, two further laminating stations, a longitudinal slitting device, and a separation unit (format punch).
  • sheet product adheresive strips
  • a 20 mm wide and 15 ⁇ m thick polyethylene terephthalate film is laminated centrally onto the release-film-free side (front face) of 120 mm width at the first laminating station.
  • siliconized polyethylene release film in a width of 120 mm is laminated on in such a way that the release film projects beyond the adhesive by 2.5 mm on either side.
  • the same linings (20 mm wide polyethylene terephthalate film centrally, 125 mm wide siliconized polyethylene film over the full area with a 2.5 mm projection on either side) are performed for the reverse face. Separation to form sheet product with a length of 62.5 mm and a width of 19 mm is accomplished by means of slitting (in longitudinal direction) and by diecutting by a format diecutter.
  • the ring-and-ball method is the customary method for ascertaining softening points. Details can be taken from ASTM E 28 and DIN EN 1238, hereby incorporated by reference.
  • the resulting adhesive assembly is adhered with the silicone adhesive side to a vertical glass wall and pressed on with a force of 100 N.
  • Bonded to the Powerstrips side is a steel hook with dimensions of 4 ⁇ 2 cm, projecting vertically from which there is a pin to which a weight can be affixed. The bond is made such that the grip tab of the Powerstrip projects from the adhesive joint. Subsequently a weight of 500 g is hung on the above-described pin at a distance of 30 mm from the wall.
  • an adhesive strip as per claim 1 is bonded without additional outer carrier layer and adhesive, and the pin is loaded with the same weight.
  • the adhesive strip from example 1 can be parted again without problems. This is done by pulling on the grip tab of the core layer, the detachment force being comparable with that of a normal adhesive bond with the adhesive strip without an additional outer carrier layer and adhesive. In the process of parting by extensional stretching, the core layer parts from the PET film, which remains with the silicone composition on the tab. This can then be peeled off easily without leaving residues on the glass.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Laminated Bodies (AREA)
US12/377,555 2006-08-18 2007-08-10 Pressure-sensitive adhesive strip for moisture-insensitive peelable adhesive bonds Abandoned US20110220295A1 (en)

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CN105443526A (zh) * 2015-11-03 2016-03-30 广东欧珀移动通信有限公司 一种消除断差的方法和移动终端电池盖
US9304550B1 (en) * 2014-09-29 2016-04-05 Apple Inc. Adhesive bond with integrated release mechanism
CN108559415A (zh) * 2018-04-23 2018-09-21 大连理工大学 一种适用于蝴蝶标本姿态及位置固定的双面胶泡棉块
CN110628350A (zh) * 2018-06-25 2019-12-31 上海海优威新材料股份有限公司 用于保护处于加工状态的工件的保护膜及其应用
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US20140190616A1 (en) * 2013-01-09 2014-07-10 ST Global Partners, LLC Double-sided adhesive membrane for finish material installation
WO2014151414A3 (en) * 2013-03-15 2014-11-13 Avery Dennison Corporation Removable film tape article
US10925417B2 (en) 2014-01-22 2021-02-23 Ccl Label, Inc. Secure hold hook
US20150218425A1 (en) * 2014-02-05 2015-08-06 Apple Inc. Stretch release conductive adhesive
JP2015203064A (ja) * 2014-04-14 2015-11-16 綜研化学株式会社 偏光板用粘着剤組成物、粘着剤層、粘着シートおよび粘着剤層付き偏光板
US9304550B1 (en) * 2014-09-29 2016-04-05 Apple Inc. Adhesive bond with integrated release mechanism
US11299650B2 (en) 2015-04-24 2022-04-12 Leigh Ann Radziwon Silicone based self-adhering article and a method for making same
CN105443526A (zh) * 2015-11-03 2016-03-30 广东欧珀移动通信有限公司 一种消除断差的方法和移动终端电池盖
CN108559415A (zh) * 2018-04-23 2018-09-21 大连理工大学 一种适用于蝴蝶标本姿态及位置固定的双面胶泡棉块
CN110628350A (zh) * 2018-06-25 2019-12-31 上海海优威新材料股份有限公司 用于保护处于加工状态的工件的保护膜及其应用

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US20160145471A1 (en) 2016-05-26
US10040975B2 (en) 2018-08-07
WO2008019994A3 (de) 2008-04-03
EP2054481A2 (de) 2009-05-06

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