Pyrimidine derivatives as hardness stabilizers
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United States of America Patent
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Oct 15, 2002
Grant Date -
Apr 4, 2002
app pub date -
Mar 21, 2001
filing date -
Mar 21, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention comprises a vulcanizable composition comprising a sulfur vulcanizable rubber, a sulfur vulcanizing agent, an accelerating agent in an amount effective to accelerate vulcanization and sufficient to not substantially inhibit vulcanization, and an amount effective to improve the hardness stabilization of said rubber upon vulcanization of a pyrimidine derivative. The invention also comprises a method of improving the hardness stabilization of a composition comprising a sulfur vulcanizable rubber by adding the above accelerating agent and pyrimidine derivative to the composition.
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