Appeal No. 2004-0824
Application 09/879,422
130ºC at at least one point therein, and chopping the extrudate
into granules (page 3, lines 16-17, 21, 24-27, 33-37 and 41-42).
EP ‘824 does not disclose a solid bisphenol A diglycidyl
ether in the list of additives. However, the teachings that the
granules can contain other plastics additives which are known
per se, and that these additives generally are in the form of
solids (page 3, lines 10-13 and 24), would have motivated one of
ordinary skill in the art to use known solid additives for the
types of plastics with which the EP ‘824 granules can be used.
PCT ‘377 discloses that a solid bisphenol A diglycidyl ether is
useful in an amount of 0.05-20 wt% as a stabilizer for recycled
plastics including polyolefins, polystyrene, polyesters,
polyvinyl chloride and acrylonitrile-butadiene-styrene (page 1,
2, 5, 21 and 22). EP ‘824 is silent as to whether the plastics
are virgin or recycled, but teaches that plastics having the
compositions of the above-listed PCT ‘377 plastics are among the
plastics with which the EP ‘824 granules can be used (page 29,
line 45 - page 32, line 16). One of ordinary skill in the art,
therefore, would have had a reasonable expectation of success in
using the PCT ‘377 solid bisphenol A diglycidyl ether stabilizer
with the EP ‘824 plastics. Hence, EP ‘824 and PCT ‘377 would
have rendered prima facie obvious, to one of ordinary skill in
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