Appeal No. 96-2407
Application 08/072,210
is in the range of from 0.1 to 10.
Discussion
Cha (1) grinds styrene butadiene rubber into particles
having a diameter of less than 500 microns, (2) adds an oil to
the particles to form a composition, (3) heats the composition
to approximately 40 to 70 C., and (4) mixes the compositionO O
for
adding ester gum, calcium carbonate and a coloring agent to
the composition and injection molding the modified composition
so to produce a sticky, rubber-based form. The composition
prepared by steps (1) to (4) of Cha's method differs from the
method appellants claim in a number of aspects.
Cha does not expressly teach that the styrene butadiene
rubber he employs is a styrene butadiene block copolymer.
However, Cha states (Cha, col. 2, lines 10-12), “A
particularly suitable styrene butadiene rubber product is
manufactured by Shell Chemical Co. and sold under the
tradename Cariflex.” In the first office action mailed
November 17, 1993, the examiner stated (Paper No. 6, p. 3,
para. 1):
Cha discloses non-toxic compositions containing
styrene-butadiene rubber and . . . oils. See Col. 2[,]
line[s] 13-18. As preferred rubber component Cha
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