BR245

BR245

  • BR245
  • BR245
  • BR245
  • BR245
  • BR245
  • BR245
  • BR245

BR245

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
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