Appeal No. 2006-2538 Page 7
Application No. 10/140,692
such as adhesiveness, holding power and warpage resistance. Thus, as Appellants
have argued, the disclosure by Takigawa that using a phenol-modified rosin-terpene as
a tackifier improves such properties in double-faced tape would not necessarily have led
those skilled in the art to expect that using phenol-modified rosin-terpene as a tackifier
in a hot melt adhesive.
Different adhesives are used for different purposes and require different
properties. A hot melt adhesive must achieve a satisfactory viscosity at an elevated
temperature and harden to form an adhesive layer when it cools. Specification, page 1.
Double-faced adhesive tape is not heated prior to use and cooled after application; the
adhesive in double-faced tape therefore has different properties than a hot melt
adhesive. The evidence of record does not support the examiner’s position that those
skilled in the art would have been motivated to use a phenol-modified rosin-terpene as a
tackifier in a hot melt adhesive based on Takigawa’s teaching that its use in double-
faced tape conferred an advantageous balance of properties.
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