Pyrimidine derivatives as hardness stabilizers
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United States of America Patent
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Nov 11, 2003
Grant Date -
N/A
app pub date -
Mar 21, 2001
filing date -
Mar 21, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vulcanizable composition comprising a sulfur vulcanizable rubber, a sulfur vulcanizing agent, an accelerating agent selected from the group consisting of non-thiazole sulfenamide accelerators in an amount effective to not substantially inhibit vulcanization and an amount effective to improve the hardness stabilization of said rubber upon vulcanization of a hardness stabilization agent comprising a pyrimidine derivative. A method of improving the hardness stabilization of a composition comprising a sulfur vulcanizable rubber by adding to said composition the accelerators and pyrimidine derivative.
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