BR277 rubber is a solution polymerized low cis star branched, low efficiency coupled, oil extended polybutadiene produced using alkyl lithium initiator in batch reactors.
BR 277 oil extended polybutadiene is used in tire compounds and in some mechanical good compounds.
Properties
Test Methods
Analytical Manual
Units
General
Mooney Viscosity
ASTM D1646
MPP16
ML1+4 @ 100°C
37 – 47
Bound Styrene
ASTM D5775
MPP5-MPP6
wt %
N/A
Block styrene
ASTM D3314
MPP8
Solution viscosity*
ASTM D5774
MPP9
cPs
Gel content
MPP12
arbitrary
Molecular weight
MPP1
KDalton
Coupling efficiency
%
Volatile matter content
ASTM D5668
MPP10
0.3 max
Residual solvent
MPP18
ppm
Colour
ASTM E313
MPP13
Yellow index
Solution color (Pt/Co)
ASTM D1209
Vinyl content
wt % on butadiene
11 – 13
Ash content
ASTM D5667
MPP15
0.04
Solvent extractables
MPP11
26.3–29.3