Appeal No. 95-3220
Application 08/112,986
specification, the appellants’ Brief (Paper No. 29), the examiner’s Answer (Paper
No. 30), and the declaration of Mr. Kosaka (attached to Paper No. 25), and find ourselves
in substantial agreement with the appellants’ position. Accordingly, we reverse.
Background and Discussion
The claimed invention, as exemplified in claims 7 and 9, above, is directed to
polyarylene sulfide resin compositions which are used as engineering plastics. Such
resins are said to have “excellent physical properties, such as heat resistance, fire
retardancy, high rigidity and so on.” Specification, p. 1, para. 1. According to the
appellants, prior attempts to improve properties such as, the impact strength of polyarylene
sulfide resins, without reducing their heat-related properties, have met with limited
success. Id., pp. 1-4. The appellants state that they have discovered that “the impact
resistance of polyarylene sulfide resin compositions, could be improved without
substantially diminishing the heat related properties by blending a modified polyarylene
sulfide resin with a polyamide in effective combination with a carboxylic acid moiety. The
modification of the polyarylene sulfide resin which has permitted the blending of this resin
with polyamide resins to achieve these results has been to include an amine or an amide
substituent in the polyarylene sulfide resin. . . . It has been found that such a blend of the
modified polyarylene sulfide with the polyamide resin and the carboxylic acid moiety
results in a composition which, when conventionally formed into a shaped article, exhibits
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