Main Features
BR245 rubber is a solution polymerized low cis star
Branched, low coupled, dry
Polybutadiene produced using alkyl lithium initiator in batch reactors.
Main Applications
BR 245 polybutadiene is used in tire compounds and in some mechanical good compounds. Good hysteresis properties of BR 245 allow it to be blended with natural rubber to produce enhanced properties in truck tire treads. The addition of polybutadiene low cis to natural rubber upgrades abrasion and cracking resistance, maintains good resilience and also provides better resistance to overcure and degradation during aging. BR 245 and SOL R 1204 were tried in blends with natural rubber in large size passengers tyre reducing groove cracking compared to natural rubber.
Keys
BR245 rubber is a solution polymerized low cis star branched, low coupled, dry polybutadiene produced using alkyl lithium initiator in batch reactors.
Properties | Test Methods | Analytical Manual | Units | |
---|---|---|---|---|
General | ||||
Mooney Viscosity | ASTM D1646 | MPP16 | ML1+4 @ 100°C | 50 – 60 |
Bound Styrene | ASTM D5775 | MPP5-MPP6 | wt % | N/A |
Block styrene | ASTM D3314 | MPP8 | wt % | N/A |
Solution viscosity* | ASTM D5774 | MPP9 | cPs | N/A |
Gel content | MPP12 | arbitrary | N/A | |
Molecular weight | MPP1 | KDalton | N/A | |
Coupling efficiency | MPP1 | % | N/A | |
Volatile matter content | ASTM D5668 | MPP10 | wt % | 0.6 max |
Residual solvent | MPP18 | ppm | N/A | |
Colour | ASTM E313 | MPP13 | Yellow index | N/A |
Solution color (Pt/Co) | ASTM D1209 | arbitrary | N/A | |
Vinyl content | MPP5-MPP6 | wt % on butadiene | 11 – 13 | |
Ash content | ASTM D5667 | MPP15 | wt % | 0.08 |
Solvent extractables | ASTM D5774 | MPP11 | wt % | N/A |