VESTENAMER® is a semicrystalline polyolefine additive that is also described as a trans-polyoctenamer rubber (TOR) since it is based on cyclooctene and shows a high proportion on trans-double bonds. As a polymeric processing aid, it acts as a plasticizer of rubber compounds in the mixing and manufacturing process. Due to the presence of double bonds, VESTENAMER® takes part in the vulcanization process and is incorporated into the rubber matrix. Therefore, one can consider VESTENAMER as a reactive plasticizer.
The properties of VESTENAMER®:
- low melting point
- low viscosity in the melt (Mooney <10)
- high crystallinity, fast recrystallization rate
- high percentage of macrocycles (>30 %)
- a double bond every eighth carbon Atom
- high proportion of trans-configured double bonds
Low viscosity above the melting point
VESTENAMER® has a high macrocycle content that significantly reduces its molecular weight. Unlike linear macromolecules, macrocycles can crosslink to a completely three-dimensional network, even at low molecular weight. Combined with a broad molecular weight distribution, its low molecular weight is also responsible for its unusually low viscosity at temperatures above the melting range. At 100 °C VESTENAMER® shows a Mooney viscosity ofless than 10 units.