| abstract |
THERE IS PROVIDED A BLOCKING PROCESS FOR POLYSTRENE IN WHICH A STYRENE MONOMER IS INITIALLY POLYMERIZED SLURRIED IN A PARAFFINIC OR MONOOLEFIN SLURRYING MEDIUM, USING AN ANIONIC INITIATOR AND A STYRENE-ALKYLSTYRENE BLOCK POLYMER DISPERSANT, A DIVINYL-BENZENE MODIFYING AGENT IS ADDED ANIONICALLY TO MODIFY THE POLYSTYRENE, AND THE MODIFIED POLYSTYRENE IS BLOCKING WITH A MONOMER POLYERIZABLE WITH A FREE RADICAL INITIATOR, A ZIEGLER-NATTA COORDINATION CATALYST, OR A CATIONIC INITIATOR. |