Medical patch material and a process for its production
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United States of America Patent
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Jun 24, 1997
Grant Date -
N/A
app pub date -
Dec 20, 1995
filing date -
Mar 18, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A medical patch material has a support coated with an even and porous spread of pressure sensitive hot-melt adhesive coating, formed by means of gravure printing, has a sufficient porosity and a resulting vapor permeability to skin moisture on the one hand, as well as an absolute bacteria-impermeability and reliable adherence of the patch material on the other hand. This is achieved by the fact that the pressure sensitive hot-melt adhesive spread: a) forms coherent webs in the lengthwise and transverse direction, which include island-shaped adhesive-free areas; b) that the proportion of the adhesive-free areas amounts to between 30 and 60%, preferably between 40 and 57% of the total surface, and c) that the coat weight of the adhesive amounts to between 30 and 160 g/m.sup.2, preferably between 40 and 120 g/m.sup.2.
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