Appeal No. 1996-2112
Application 08/210,217
butadiene-styrene, styrene-isoprene-styrene, and styrene-ethylene-butylene-styrene.
Algrim, col. 3, lines 29-38. Preferred is a composition comprising about 80% styrene-
butadiene-styrene and about 20% styrene-butadiene di-block copolymer. Id., lines 38-50.
According to the examiner the “[a]ddition of a radial copolymer to the composition
containing [a] predominant amount of linear copolymers, i.e.[,] substitution of a linear
styrene-isoprene copolymer with [a] combination of radial a styrene butadiene and linear
styrene isoprene copolymer [sic, copolymers] would have been obvious from the teachings
of Barlow as per discussions . . . regarding [the] rejection over Mitchell.” Answer, p. 6.
We cannot sustain this rejection.
Here, we agree that Algrim discloses a composition comprising a linear styrene-
butadiene di-block copolymer (component (C)) and a linear styrene isoprene copolymer
(component (B)). However, Algrim lacks a teaching or suggestion of a composition
comprising radial styrene-butadiene block copolymers (component (A)) as required by the
claims. See claim 1. As we discussed above, we do not find that Barlow teaches or
suggests a composition comprising radial styrene-butadiene block copolymers, in
combination with a linear and/or radial styrene-isoprene triblock copolymer, and a linear
styrene-diene di-block copolymer. Accordingly, the rejection is reversed.
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