Appeal No. 1997-1018
Application No. 08/369,944
of at least 1000 liters vapor/m /24 hours at 40EC. and 80%2
relative humidity, where the pressure sensitive adhesive
coating composition contains hydroxyalkyl acrylate in the
amount of 15 to 40% by weight (Brief, page 2). Illustrative
claim 21 is reproduced below:
21. A surgical or medical dressing comprising a backing
material coated with a continuous water vapor permeable,
pressure sensitive adhesive composition comprising a polymer
derived from monomers consisting essentially of:
a) from about 50 to 80% by weight of alkyl acrylate
or methacrylate wherein the alkyl group contains
from about 4 to 12 carbon atoms;
b) from about 15 to 40% by weight of hydroxyalkyl
acrylate or methacrylate wherein the alkyl group
contains from about 2 to 4 carbon atoms;
c) from about 0 to 35% by weight of alkyl acrylate
or methacrylate wherein the alkyl group contains
from about 1 to 3 carbon atoms;
d) from about 0 to 10% by weight of glycidyl
acrylate or methacrylate; and
e) from about 0 to 10% by weight of acrylic acid,
the dressing having a water vapor transmission rate of at
least 1000 liters vapor/m /24 hours at 40EC and 80% relative2
humidity difference.
2
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