Nd-based Poly-butadiene Rubber (Nd-BR)
Nd-based Poly-butadiene Rubber (Nd-BR)
Nd-BR technology (High-cis polybutadiene) uses catalytic systems with precise Nd:Al:H2O:RCOOH ratios and purified fluids to obtain polymers with molecular weight distribution (MWD) with polydispersity index (Mw/Mn) lower than 2.7 and self-production of the pre-catalyst (prepared off-line) constituted by Nd-carboxylate. The catalyst is prepared directly inside polymerization reactor adding separately his constituents (precatalyst and metal-alkyl) (in situ technology).
Process steps & Features
- Monomer and Solvent Purification
- Polymerization
- Blending
- Stripping
- Finishing
- Cis Content of above 97%
- Dispersion index of lower than 2.7
- Significant reduction in the maintenance frequency and reactor cleaning
- Drastic reduction of Nd and Al-alkyls consumption
- Possibility to introduce LCB type ramifications through an online post modification, eliminating “cold flow” problem and improving rate of carbon black incorporation in compound
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