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

{
  "publication_number": "US10040975B2",
  "country": "US",
  "kind": "B2",
  "title": "Pressure-sensitive adhesive strip for moisture-insensitive peelable adhesive bonds",
  "abstract": "A method of separating two substrates bonded with a redetachable, at least single-sidedly pressure-sensitive adhesive strip composed at least of a) a core layer which has a breaking extension of at least 300%, b) an outer carrier layer which has a breaking extension of not more than 120% and which at least sectionally is connected to the core layer such that it separates from the core layer when the latter is extensionally stretched, and c) a first adhesive layer which is applied at least sectionally to the side of the outer carrier layer that is opposite the side connected to the core layer, in which the core layer is stretched in the direction of the bond plane, starting from a region which has been made nonadhesive, until the core layer releases from at least one of the outer carrier layers so that the two substrates are separated from one another.",
  "claims": [
    "1. A method of separating two substrates bonded in a bond plane with a redetachable, pressure-sensitive adhesive strip, the adhesive strip bonded between the two substrates, comprising: a) a core layer which has a breaking extension of at least 300%, b) an outer carrier layer which has a breaking extension of not more than 120% and which is connected to the core layer such that it separates from the core layer when the core layer is extensionally stretched, and c) a first adhesive layer which is applied to the side of the outer carrier layer that is opposite the side connected to the core layer; the method comprising: stretching the core layer in the bond plane, starting from a region which has been made nonadhesive, until the core layer releases from the outer carrier layer so that the two substrates are separated from one another and at least one of the two substrates remains bonded to the outer carrier layer via the first adhesive layer, and peeling the outer carrier layer together with the first adhesive layer from the other substrate at an angle of removal of greater than 45°.",
    "2. The method of claim 1, wherein the core layer is formed from an adhesive which is redetachable by extensional stretching in the bond plane.",
    "3. The method of claim 1, wherein the core layer protrudes beyond the outer carrier layer at least in one region.",
    "4. The method of claim 3, wherein the protruding region is made nontacky by the application of pieces of film, foil or paper.",
    "5. The method of claim 2, wherein the adhesive of the core layer is constructed on the basis of styrene block copolymers.",
    "6. The method of claim 1, wherein a further adhesive layer is applied on the side of the core layer that is opposite the side connected to the outer carrier layer.",
    "7. The method of claim 6, wherein between core layer and outer carrier layer there is a second adhesive layer which has the same composition as the further adhesive layer.",
    "8. The method of claim 7, wherein the bond strengths of the second adhesive layer and of the further adhesive layer can be reduced by extensional stretching in the bond plane.",
    "9. The method of claim 8, wherein the core layer protrudes beyond the outer carrier layer at least in one region.",
    "10. The method of claim 8, wherein the core layer is comprised of at least one of: a foam selected from the group consisting of low-density and very low-density polyethylenes (LDPE, LLDPE, VLDPE), ethylene-vinyl acetate copolymers and mixtures of aforementioned polymers; or films selected from the group consisting of polyvinyl acetates, polypropylenes, polyurethanes based on aromatic and aliphatic diisocyanates, polystyrene, impact-modified polystyrenes, PVC, and acrylate copolymers.",
    "11. The method of claim 1, wherein the first adhesive layer is based on silicone and is crosslinked.",
    "12. The method of claim 1, wherein on the core layer there is a second outer carrier layer which separates from the core layer when the core layer is extensionally stretched, and wherein the second outer carrier layer is optionally provided with a third adhesive layer on the free side thereof.",
    "13. The method of claim 12, that wherein at least one of: the outer carrier layer and the second outer carrier layer; or the first and the third adhesive layers, are identical.",
    "14. The method of claim 13, wherein at least one of: the core layer, or the third adhesive, comprise block copolymers including at least one of: polymer blocks formed from vinyl aromatics (A blocks); or polymer blocks formed by polymerization of 1,3-dienes (B blocks).",
    "15. The method of claim 14, wherein at least one of: the vinyl aromatics are styrene; or the B blocks are formed by polymerization of at least one of: butadiene, isoprene, hydrogenation products of butadiene or isoprene, or isobutylene."
  ],
  "description_excerpt": "This is a Division of U.S. application Ser. No. 12/377,555 filed May 27, 2011, now abandoned, which is a 371 of PCT/EP2007/058296 filed Aug. 10, 2007, claiming priority of German Application 10 2006 038 719.8 filed Aug. 18, 2006, the disclosure of which is incorporated herein by reference\n\nThe 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.\n\nHighly elastically or plastically extensible pressure-sensitive adhesive strips which can be detached again without residue or destruction by extensional stretching in the bond plane are known from, for example, U.S. Pat. No. 4,024,312 A, DE 33 31 016 C2, WO 92/01132 A1, WO 92/11333 A1, DE 42 22 849 A1, WO 95/06691 A1, DE 195 31 696 A1, DE 196 26 870 A1, DE 196 49 727 A1, DE 196 49 728 A1, DE 196 49 729 A1, DE 197 08 364 A1, DE 197 20 145 A1, DE 198 20 854 A1, WO 99/37729 A1, and DE 100 03 318 A1, and are referred to inter alia below as strippable pressure-sensitive adhesive strips.\n\nStrippable 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.",
  "cpc": [
    "C09J 7/0221",
    "B32B 43/006",
    "B32B 5/04",
    "C09J 153/02",
    "C09J 183/04",
    "C09J 2201/134",
    "C09J 2201/162",
    "C09J 2201/606",
    "C09J 2201/61",
    "C09J 2201/618",
    "C09J 2301/1242",
    "C09J 2301/162",
    "C09J 2301/302",
    "C09J 2301/304",
    "C09J 2301/308",
    "C09J 2400/243",
    "C09J 2423/105",
    "C09J 2453/00",
    "C09J 2467/006",
    "C09J 2483/00",
    "C09J 7/26",
    "C09J 7/29",
    "C09J 7/381",
    "C09J 7/387",
    "Y10T 156/1142",
    "Y10T 428/249983",
    "Y10T 428/2848"
  ],
  "ipc": [
    "B32B 43/00",
    "C09J 7/29",
    "B32B 5/04",
    "B32B 7/06",
    "C09J 7/26",
    "C09J 7/38"
  ],
  "assignees": [
    "Tesa SE"
  ],
  "inventors": [
    "Thorsten Krawinkel",
    "Andreas Junghans"
  ],
  "filing_date": "2016-01-28",
  "publication_date": "2018-08-07",
  "grant_date": "2018-08-07",
  "priority_date": "2006-08-18",
  "application_number": "US-201615009003-A",
  "family_id": "38659809",
  "cited_by_count": 2,
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