Appeal 2007-1224
Application 10/628,725
We REVERSE.
I. BACKGROUND
The invention relates to an adhesive (claim 1) and an at least one layer
pressure sensitive adhesive sheet strip including the adhesive of claim 1
(claim 13). The adhesive is comprised of end blocks of a vinylaromatic such
as styrene and at least one block composed of a conjugated diene (1,3 diene).
“In the preparation of block copolymers based on vinylaromatics, preferably
styrene and 1, 3-dienes, especially isoprene and butadiene, both 1,2-linked
and 1,4-linked dienes are incorporated into the diene block.” (Specification
7:3-5). “Since the 1,2-linked dienes contain a terminal double bond, while
the double bond in the case of the 1,4-linked dienes is in the main chain, a
selective hydrogenation of the terminal and hence more reactive double
bonds is possible.” (Specification 7:6-9). The claimed adhesive composition
is limited to block copolymers in which the fraction of 1,2-linked diene is
selectively hydrogenated. Claim 1 is illustrative of the subject matter on
appeal:
1. An adhesive for an at least one-layer pressure sensitive adhesive
sheet strip which is residuelessly and nondestructively redetachable by
extensive stretching substantially in the bond plane, said adhesive being
comprised of at least one block copolymer having one or two end blocks
composed of vinylaromatics, and
a block composed of a conjugated diene, wherein the fraction of 1,2-
linked diene is selectively hydrogenated.
The Examiner relies upon the following prior art as evidence of
unpatentability:
Lühmann US 6,004,665 Dec. 21, 1999
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