Appeal No. 1998-1862
Application No. 08/644,622
antioxidant comprising a blend of p-phenylene
diamine in combination with zinc salt derivatives of
mercapto-benzimidazole, wherein said natural rubber
has a majority of monosulfidic crosslinks and
wherein the mount has stable dynamic properties
after exposure to a temperature of 250/F for 70
hours, when tested using the MTS 830 elastomer test
system.
The examiner relies upon the following references as
evidence of obviousness:
Cox 4,021,404 May 03,
1977
Aoshima et al. (Aoshima) 4,983,685 Jan.
08,
1991
Cornell et al. (Cornell) 5,120,779 Jun.
09,
1992
Wolff et al. (Wolff) 5,159,009 Oct. 27,
1992
Appellant’s claimed invention is directed to a natural
rubber that is useful for engine mounts and has stable dynamic
properties upon exposure to a temperature of 250/F for 70
hours. The natural rubber, which is produced by a known
efficient vulcanization system, has a curing system comprising
an accelerator component and a sulfur donor component, and
2
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