Appeal No. 1997-0833
Application No. 08/363,438
sensitive adhesive and a liquid organohydrogenpolysiloxane
containing on the average at least two silicon-bonded hydrogen
atoms per molecule. When this composition is combined with a
second composition comprising the same pressure sensitive
adhesive and a curing agent for the liquid organohydrogenpoly-
siloxane, a crosslinkable pressure sensitive adhesive composition
is obtained. Appellants point out at lines 3 and 4 of page 4 of
the specification, however, that the adhesive properties of
Blizzard's compositions are such that it cannot be used as a
releasable adhesive. Moreover, appellants indicate that while
Blizzard discloses that the pressure sensitive adhesive may be
based on styrene-butadiene random copolymers, styrene-butadiene
block copolymer adhesives are not explicitly disclosed by
Blizzard.
Using the Blizzard reference as his "primary reference", the
examiner contends that it would have been obvious to a person of
ordinary skill in this art to replace the conventional random
styrene-butadiene copolymer utilized in Blizzard's pressure
sensitive adhesive composition with the known block copolymer
(presumably the styrene-butadiene block copolymers described as
"Kraton" 1101 and 1102) utilized in the pressure adhesive
composition of Miller. See Miller at page 4, lines 10-17,
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