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Solution Styrene Butadiene Rubber (SSBR) | The Lanxess Buna VSL portfolio offers solution styrene-butadiene rubbers that have different styrene and vinyl levels combined with varying Mooney viscosities. In contrast to emulsion SBR the molecular weight, molecular weight distribution, microstructure and branching can be controlled to produce polymers that offer improved end properties. | | | Solution SBR | Emulsion SBR | | styrene level (%) | 15 - 40 | 23 - 40 | | vinyl level (%) | 7 - 55 | 15 - 20 | | styrene distribution | block or random | random | | fatty acid (max%) | 0,5 | 6 | | molecular weight | controlled | | | mol. weight distribution | narrow | broad | | long chain branching | slight | appreciable |
Solution SBRs are gradually replacing emulsion SBRs for special applications and particularly for summer and winter tire treads and low rolling resistance tires especially in the high performance sector. It is sometimes blended with NR, BR or emulsion SBR to improve the properties of the final product.
As a component in the polymer blend of car tire treads, grip and rolling resistance will be enhanced by controlling the Tg and shape of the tan delta curve.
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Provided that the compounds are formulated and processed correctly, the vulcanizates have good resistance to reversion. The low temperature flexibility, resilience and abrasion resistance depend on the polymer's styrene and vinyl content.
| Name | styrene (%) | vinyl (%) | ML1+4 | oil (type) | oil (phr) | Tg (°C) | TDS | MSDS | | Buna VSL 2525-0 M | 25 | 25 | 54 | none | - | -49 | TDS | MSDS | | Buna VSL 5025-0 HM | 25 | 50 | 65 | none | - | -22 | TDS | MSDS | | Buna VSL 5025-2 | 25 | 50 | 47 | TDAE | 37,5 | -29 | TDS | MSDS | | Buna VSL 5025-2 HM | 25 | 50 | 62 | TDAE | 37,5 | -29 | TDS | MSDS | | Buna VSL 5228-2 | 28 | 52 | 50 | TDAE | 37,5 | -20 | TDS | MSDS | | Buna VSL 2438-2 HM | 38 | 24 | 80 | TDAE | 37,5 | -29 | TDS | MSDS |
Key Properties
- good resistance to reversion
- improved wet grip
- low hysteresis
- good resilience
- good abrasion resistance
Food contact
Information concerning FDA and BfR compliance can be obtained on request from the Health, Safety, Environment and Quality Department (HSEQ) of Lanxess.
__Data Sheets Buna VSL
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