Vulcanizing composition containing cyclododecasulfur and improved cyclododecasulfur compound
View Patent ↗A vulcanizing composition useful for the vulcanization of vulcanizable formulations is disclosed. The vulcanizing composition includes a vulcanizing agent which in turn includes a cyclododecasulfur compound. A cyclododecasulfur compound characterized by a DSC melt point onset of between 155° C. and 167° C. when measured at a DSC heat rate of 20° C./minute is also disclosed.
1. A vulcanizing composition for use in forming a vulcanized article, said vulcanizing composition comprising a vulcanizing agent; wherein said vulcanizing agent includes a cyclododecasulfur compound, and wherein the vulcanizing composition further comprises stearic acid and a process oil.
2. The vulcanizing composition of claim 1 further comprising one or more of: a cellulosic binder, a xanthan, vegetable oil, epoxidized vegetable oil, a polymeric binder, or a dispersing agent.
3. The vulcanizing composition of claim 1 wherein said vulcanizing agent further comprises one or more sulfur-containing curatives selected from the group consisting of polymeric sulfur and cyclooctasulfur.
4. The vulcanizing composition of claim 1 wherein said cyclododecasulfur compound is characterized by a DSC melt point onset of between 155° C. and 167° C. when measured at a DSC heat rate of 20° C./minute.
5. The vulcanizing composition of claim 4 wherein said DSC melt point onset is between 157° C. and 167° C. when measured at a DSC heat rate of 20° C./minute.
6. The vulcanizing composition of claim 1 , wherein the cyclododecasulfur compound is in particle form with a median particle diameter of 0.1 to 1200 microns.
7. The vulcanizing composition of claim 6 wherein the median particle diameter is from 0.5 to 300 microns.
8. The vulcanizing composition of claim 1 , wherein the cyclododecasulfur compound is in particle form with a polydispersity ratio of no more than 15.
9. The vulcanizing composition of claim 8 , wherein the polydispersity ratio is no more than 10.
10. The vulcanizing composition of claim 9 wherein the polydispersity ratio is no more than 8.
11. The vulcanizing composition of claim 9 wherein the particles have a specific surface area of no more than 50 m 2 /g as measured according to the BET method.