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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

Packaging
Storage
Safety
تصاویر
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