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

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

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 802-40C/KE, then with other peroxides such as VAROX 231 and DBPH . . .

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

VAROX SP : Scorch Protected MH t’90 tS5

VAROX SP : Scorch Protected MH MH t’90 tS5 tS5

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

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

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

VAROX SP: Scorch Protected Same reactivity as VAROX 802-40 VAROX 802-40

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

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

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

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

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

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

VAROX CST: Controlled Speed Technology MH t’90 tS5

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

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

VAROX CST: Controlled Speed Technology Scorch time VAROX 802-40SP Same scorch as VAROX 802-40-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 802-40

VAROX CST: Controlled Speed Technology Cure time VAROX 802-40-SP 802-CST is 20% faster than 802-40 / 802-40-SP whatever the curing temperature VAROX 802-40 VAROX 802-CST

30% faster than TAC & 17% faster than TRIM VAROX CST: Controlled Speed Technology iso-MH comparison 30% faster than TAC & 17% faster than TRIM Scorch @ 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

VAROX CST: Controlled Speed Technology Comparable mechanical performances

VAROX 802-CST can replace peroxide + coagent   VAROX 802-CST VAROX 802-40 +TAC VAROX 802-40 +TMPTMA VAROX 802-40 +HVA2 XL density - Cure time +++ + Scorch time Tensile strength ++ Elongation at break Compression Set  

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

CONCLUSIONS TWO NEW GRADES OF VAROX Much better scorch resistance SP (VAROX 802-40MB-SP) Much better scorch resistance Masterbatch Commercially available CST (VAROX 802-40-CST) Faster cure Increased scorch resistance Powder & Granules Available for sampling in 2Q04 Commercially available in 3Q04

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