Bonding method using fast hardening UV adhesive and slower hardening adhesive

{
  "publication_number": "US6238508B1",
  "country": "US",
  "kind": "B1",
  "title": "Bonding method using fast hardening UV adhesive and slower hardening adhesive",
  "abstract": "In the method of bonding two parts (1,2) together a positioning device (3) accurately positions the two parts (1,2) relative to each other and a comparatively slower hardening adhesive layer (4) is applied between the two parts (1,2) to bond the two parts (1,2) together. After the adhesive layer (4) is applied and the parts positioned, a faster hardening UV adhesive (5) is applied on adjacent edge regions of the two parts (1,2) over an edge of the slower hardening adhesive layer (4), so that the faster hardening UV adhesive (5) is accessible for UV irradiation. Subsequently the faster hardening UV adhesive (5) is hardened with the UV radiation and the positioning device (3) is removed from the parts (1,2) which are held fixed in a provisional manner. Then the slower hardening adhesive layer (4) is hardened preferably in an oven that can be used for a large number of similar pairs of parts.",
  "claims": [
    "1. A method of bonding two parts together comprises the steps of: a) providing a positioning device (3) for positioning the two parts (1, 2) relative to each other; b) applying a first adhesive layer (4) comprising a first adhesive to the two parts (1, 2) to bond the two parts (1, 2) together and adjusting the position of the two parts with respect to each other with the positioning device (3); c) after applying the first adhesive layer (4) and after the adjusting of step b), applying a second adhesive which is UV hardenable (5) on the two parts (1, 2) and over an edge of the first adhesive layer (4), so that the second adhesive (5) is accessible for UV irradiation, wherein the second adhesive hardens faster than the first adhesive; d) subsequently hardening the second adhesive (5) with UV radiation; e) removing the positioning device (3); and subsequently f) hardening the first adhesive layer (4).",
    "2. The method as defined in claim 1, wherein the first adhesive comprises an epoxy resin.",
    "3. The method as defined in claim 1 or 2, wherein the hardening of the first adhesive layer (4) takes place in an oven (6).",
    "4. The method as defined in claim 3, further comprising placing a plurality of pairs of said parts (1, 1 ′, 2, 2 ′), each pair formed by steps a) through e) of claim 1, in said oven to harden the first adhesive layer of each pair."
  ],
  "cpc": [
    "C09J 5/06",
    "C08L 63/00",
    "C09J 2463/00",
    "H05K 3/305",
    "Y10T 29/4913"
  ],
  "assignees": [
    "BOSCH GMBH ROBERT"
  ],
  "filing_date": "1999-10-19",
  "publication_date": "2001-05-29",
  "grant_date": "2001-05-29",
  "priority_date": "1998-12-07",
  "application_number": "US-42085799-A",
  "family_id": "7890211",
  "citations": [
    "JPH0660346A",
    "US4954197A"
  ]
}