Method and article for producing flexible, flat substrates with porous adhesive coatings
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United States of America Patent
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-
Mar 25, 1997
Grant Date -
N/A
app pub date -
Oct 4, 1994
filing date -
Feb 3, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Process for producing a flexible, planar carrier coated with a porous adhesive layer, characterized in that a) a flowable adhesive composition is applied to an intermediate carrier having the following properties: it has a microscopically undulating, pleated, fissured or furrowed surface the adhesive composition can be easily detached from the surface thereof it is essentially air-impermeable, b) the microscopic air or solvent inclusions resulting, after coating the intermediate carrier, between the adhesive composition and the intermediate carrier are expanded by increasing the temperature until the surface of the adhesive composition bursts, and c) the adhesive composition is subsequently transferred from the intermediate carrier onto the final carrier.
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