Appeal No. 2000-1448 9
Application No. 08/709,975
with Sandostab P-EPQ. Finally, we find that further additives including sterically hindered
phenols may be added to the composition of GB ‘362, See page 22.
Akashi discloses that the same phosphonites of GB ‘362 are particularly superior in
hydrolysis resistance. See column 2, lines 60-68, and Example 1. EP ‘717 is directed to
a novel polyorganosiloxane containing sterically hindered piperidino groups, page 2, line
1 to page 5, line 38, and page 8, lines 18-21, but adds little to the prior disclosures.
Although, it would appear at first instance that GB ‘362 provides a suggestion for
placing the stabilized thick-walled polyolefin molding in permanent contact with water,
reference to Example 1 discloses that a composition prepared from a mixture of Sandostab
P-EPQ, a phosphonite stabilizer within the scope of the claimed subject matter and
Chimassorb 944b, a hindered amine within the scope of the claimed subject matter, after
exposure to 80% relative humidity at 60oC results in the hydrolysis of 57% of the
phosphonite stabilizer within three days. Although this result discloses a substantial
improvement over the utilization of the phosphonite stabilizer alone, we conclude that the
suggestion of improved protection from moisture, humidity, and water, in and of itself, is
insufficient to suggest and provide adequate motivation to permanently contact the
polyolefin molding compositions with water, in view of the extensive hydrolysis of the
stabilizer.
Our position is further supported by the data present in the specification wherein
extraction experiments are conducted with the molding compositions in contact with water
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