Polar modifiers for high performance styrenic block copolymers

Modens® BR

MODENS® BR is a sterically hindered polar modifier used during the production of s-SBR (solution Styrene Butadiene Rubber) to control and obtain a narrow molecular weight distribution. MODENS ® BR is usually used at a temperature above 80°C with alkyl lithium initiator in a hydrocarbon solvent such as hexane.

The property of s-SBR differs from traditional rubber as its composition can be customized by variations and levels of functionalization according to the processing and application demands.

s-SBR applies to meet or exceed the tire labeling requirements about fuel efficiency, safety and noise for cars and lightweight vehicles thanks to its low rolling resistance, high traction during braking and low abrasion.

Modens® BS

MODENS® BS is used as a randomizer during the anionic polymerization of SBS (Styrene-Butadiene-Styrene) to control the microstructure of the polymer, providing high vinyl content and enhanced distribution of styrene.

MODENS® BS is usually used at a temperature above 50°C with alkyl lithium initiator in a hydrocarbon solvent, usually hexane. SBS thermoplastic elastomer has the advantage to have the characteristics of both plastic and rubber, it is constituted by a short polystyrene chain, followed by another long polybutadiene chain and finally by another short polystyrene chain.

It is used for asphalt modification as well as compounding, sealants, adhesives and medical devices.

Modens® DEAP

MODENS® DEAP is a colorless liquid commonly used as a coupling agent during the termination step of the anionic polymerization of styrenic block copolymers, such as Styrene Butadiene Rubber and Styrene Butadiene Styrene.

MODENS® DEAP reacts with the living block styrenic copolymers to form radial polymers having at least two branches. The long chain polymeric branches radiate from MODENS DEAP and such coupled polymers have specific properties such as better flow properties than linear polymers of the same molecular weight. That render them useful for particular applications such as butimen, tires, sealants and adhesives.

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