1. New Accelerated and Scorch Protected VAROX® Peroxides for Polymer Crosslinking
R.T. Vanderbilt Company, Inc.

2. Requirements at various steps of the process
Compounding (120 – 135°C)
From 2 step to 1 step mixing
Faster mixing speed (higher temperature)
Extrusion (130 – 145°C)
Faster extrusion speed (higher temperature)
Greater output requires faster curing
Injection Molding (170 – 185°C)
Faster curing
Higher number of mold cavities (design)
Compression Molding (170 – 185°C)
Increase filling time to decrease rejects
 higher tS5
 lower tʹ90
 higher tS2 or lower tʹ90
 higher tS2
 higher tS2 and/or lower tʹ90

3. Two additional product ranges
VAROX SP = Scorch Protected
Enhanced scorch protection
VAROX CST = Controlled Speed Technology
Enhanced scorch protection and faster rate of cure
Technology initially developed in VAROX C/KE, then with other peroxides such as VAROX 231 and DBPH . . .

4. Two additional product ranges
VAROX SP = Scorch Protected
Enhanced scorch protection
VAROX CST = Controlled Speed Technology
Increased scorch protection and faster cure time

5. VAROX SP : Scorch ProtectedMH
t’90
tS5

6. VAROX SP : Scorch ProtectedMH MH
t’90
tS5
tS5

7. VAROX SP : Scorch Protected
SP: source of radicals MH
= MH
Faster radical trapping
tS5
tS5
tʹ90

8. VAROX SP: Scorch Protected
MH and tʹ 90 are comparable
ts5 X 3 at 125°C

9. VAROX SP: Scorch Protected
The lower the temperature, the more efficient the scorch protection
Possibility to increase mixing speed as a 12°C temperature increase does not affect process safety
X 3.5
X 3.0
VAROX 802-F40
+ 12°C
X 2.0

10. VAROX SP: Scorch Protected
Same reactivity as VAROX
VAROX

11. With such scorch resistance:
Possibility to compound faster by increasing mixing speed with no scorch threat (temperature can be increased with no scorch threat)
Possibility to go from 2 step mixing to 1 step mixing (cost saving)
Possibility to get faster curing process by increasing temperature with no scorch threat (injection, transfer and compression)
Solve scorch problems (for sensitive compounds or scorchy EPDM i.e., ENB vs. DCP)
Less downtime devoted to equipment cleanup (extruder, etc.)
Less rejects
Possibility of reducing the amount of antioxidant in the rubber formulation

12. Two additional product ranges
VAROX SP = Scorch Protected
Enhanced scorch protection
Concept has been also evaluated on other peroxide grades

13. VAROX DBPH-50-SP (development)
MH is not impacted
tʹ 90 is not impacted
ts5 is multiplied by 3 at 145°C

14. VAROX 231-XL-SP (development)
MH is not impacted
tʹ 90 is not impacted
ts5 is multiplied by 3 at 110°C

15. VAROX 230-XL-SP (development)
MH is unchanged
tʹ 90 is unchanged
ts5 is multiplied by 4 at 110°C

16. Two additional product ranges
VAROX SP = Scorch Protected
Enhanced scorch protection
VAROX CST = Controlled Speed Technology
Enhanced scorch protection and cure time

17. VAROX CST: Controlled Speed TechnologyMH
t’90
tS5

18. VAROX CST: Controlled Speed Technology
SP: source of radicals MH
= MH
t’90
Faster Curing
Fast Radical Trapping
tS5
tS5
t’90

19. VAROX CST: Controlled Speed Technology Scorch time x 3
Comparable efficiency
Cure time is 20% lower with 802-CST

20. VAROX CST: Controlled Speed Technology Scorch time
VAROX SP
Same scorch as VAROX SP
Possibility of increasing mixing speed as a 12°C temperature increase does not affect process safety
X 3.5
VAROX 802-CST
X 3.0
+ 12°C
X 2.0
VAROX

21. VAROX CST: Controlled Speed Technology Cure time
VAROX SP
802-CST is 20% faster than / SP whatever the curing temperature
VAROX
VAROX 802-CST

22. 30% faster than TAC & 17% faster than TRIM
VAROX CST: Controlled Speed Technology
iso-MH comparison
30% faster than TAC & 17% faster than TRIM
125°C:
X 2.5 vs. TAC
X 3.5 vs. TRIM & HVA-2
32:33
14:02
9:24
9:34
6:28
4:06
4:33
12:48
HVA is a registered trademark of DuPont Dow Elastomers

23. VAROX CST: Controlled Speed Technology
Comparable mechanical performances

24. VAROX 802-CST can replace peroxide + coagent
VAROX 802-CST
VAROX TAC
VAROX TMPTMA
VAROX HVA2
XL density -
Cure time
+++ +
Scorch time
Tensile strength ++
Elongation at break
Compression Set

25. With such scorch resistance + cure speed:
Possibility to get faster compounding by increasing mixing speed with no scorch threat (temperature can be increased with no scorch threat)
Possibility to go from 2 step mixing to 1 step mixing (cost saving)
Possibility to get a faster curing process by increasing temperature with no scorch threat (injection, transfer and compression)
Solve scorch problems (for sensitive compounds or scorchy EPDM i.e. ENB vs. DCP)
Less downtime devoted to equipment cleanup (extruder, etc.)
Reduced rejects
Possibility to reduce the amount of antioxidant in the rubber formulation
+ Faster curing  extra gain in productivity
SP + Faster Curing = CST SP

26. CONCLUSIONS TWO NEW GRADES OF VAROX Much better scorch resistance
SP (VAROX MB-SP)
Much better scorch resistance
Masterbatch
Commercially available
CST (VAROX CST)
Faster cure
Increased scorch resistance
Powder & Granules
Available for sampling in 2Q04
Commercially available in 3Q04

27. Before using, read, understand and comply with the information and precautions in the Material Safety Data Sheets, label and other product literature. The information presented herein, while not guaranteed, was prepared by technical personnel and, to the best of our knowledge and belief, is true and accurate as of the date hereof. No warranty, representation or guarantee, express or implied, is made regarding accuracy, performance, stability, reliability or use. This information is not intended to be all-inclusive, because the manner and conditions of use, handling, storage and other factors may involve other or additional safety or performance considerations. The user is responsible for determining the suitability of any material for a specific purpose and for adopting such safety precautions as may be required. R. T. Vanderbilt Company does not warrant the results to be obtained in using any material, and disclaims all liability with respect to the use, handling or further processing of any such material. No suggestion for use is intended as, and nothing herein shall be construed as, a recommendation to infringe any existing patent or to violate any federal, state or local law or regulation.