Appeal No. 1997-0833
Application No. 08/363,438
substrate (even after repeated use) are required.
Specific examples [of the use of such releasable
pressure sensitive adhesives] include self-adhering
memo labels, removable tapes, and reusable closure
systems, such as closures of packages containing
tissues.
Such releasable pressure sensitive adhesive compositions
are also referred to as "repositionable" adhesives and
"releasable and readherable" adhesives. Repositionable adhesives
are widely used on Post-ItTM note pads. See the specification at
pages 2, lines 5 through 15.
Appellants' claimed releasable adhesive compositions utilize
a monovinyl aromatic-conjugated diene block copolymer crosslinked
by reaction with an organohydrogenpolysiloxane crosslinking
agent. Appellants contend that surprisingly, such crosslinked
compositions "can be obtained without using any curing
accelerator" and that such compositions "need contain only
relatively small amounts of plasticizer." See the specification
page 5, lines 5 through 9.
Further details of the claimed composition are evident from
appealed claim 1, which is reproduced below:
1. A releasable pressure sensitive adhesive
composition comprising:
(a) a block copolymer comprising at least one
poly(monovinyl aromatic hydrocarbon) block and at
least one poly(conjugated diene) block and having
2
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