B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
154/86, 154/106.
B32B 27/04 (2006.01) B29C 65/00 (2006.01) B32B 7/04 (2006.01) B32B 27/32 (2006.01) C08J 5/12 (2006.01) H05K 1/03 (2006.01)
Patent
CA 2011205
Dispersion polymerized PTFE itself, if provided in an unfused state, is sufficiently capable of acting as a pressure sensitive adhesive to facilitate the formation of an initial mechanical bond between components of a laminate such that it may be subsequently heat treated in a rela- tively short period of time to produce a well-bonded final laminate. This fact makes it possible to prepare a laminate comprising at least one layer containing PTFE by the steps of: (a) preparing a first dimensionally stable laminate component having two major surfaces, at least one of said major surfaces having an exposed layer comprising unfused PTFE; (b) preparing a second dimensionally stable laminate component having two major surfaces, at least a first of said major surfaces being capable of forming an integral bond with the unfused PTFE-containing layer; (c) bringing said first and second laminate components together so that the exposed layer comprising unfused PTFE and the surface bondable with the unfused PTFE-containing layer are in contact with each other; (d) applying pressure to the combined lami- nate components at moderate temperature to achieve intimate contact and form a mechanical bond between the first and second laminate components; (e) introducing the mechanically bonded to a heating zone under conditions which avoid delamination; and (f) sintering the mechanically bonded lami- nate components in a heating zone to consolidate the unfused PTFE-containing layer. The mechanical bond formed is suffi- ciently strong that the consolidation can be done in a free-sintering process (no applied pressure). Application of pressure, however, is generally not detrimental to the product.
Effenberger John A.
Enzien Francis M.
Keese Frank M.
Koerber Keith G.
Chemical Fabrics Corporation
Moffat & Co.
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