Suspension polymerization rubber-modified

In 1954, Haward of Shell obtained a patent for rubber-modified PS made by suspension polymerization [16]. This early product, however, contained fish-eyes - small crosslinked gel particles - since each suspension particle was crosslinked by styrene-butadiene rubber. Researchers at Monsanto overcame this problem [17] by including a prepolymerization step with shearing agitation. 

The impact strength of the modified polymer is sometimes affected by the technique used for its preparation. For instance, the impact strength of (BAN-rubber)-PVC blends is higher for PVC prepared by emulsion polymerization than for PVC prepared by suspension polymerization [40]. 

EPM and EPDM can be produced by solution polymerization, while suspension and slurry polymerization are viable options. EPDM can be gas-phase 1,-4 hexadiene polymerized using Ziegler-Natta catalysts. Union Carbide produces ethylene propylene rubber (EPR) using modified Unipol low-pressure gas-phase technology. 

Impact modifier (Rubber) HRG High Rubber Graft, emulsion/suspension ABS (Acrylonitrile-Butadiene-Styrene) BABS Bulk Polymerized ABS (Acrylonitrile-Butadiene-Styrene) SiCP Polycarbonate Silicone Copolymer. 

---