| abstract |
A FAST POLYMERIZATION PROCESS FOR MONOMERS WHICH CAN BE POLYMERIZED BY ANIONIC CATALYSIS, PARTICULARLY STYRENE, POSSIBLE MIXED WITH BUTADIENE OR IN THE PRESENCE OF A POLYMER. THE PROCESS IS CHARACTERIZED BY THE FACT THAT THE MONOMER OR MONOMERS ARE BULK-POLYMERIZED IN A THIN-FILM POLYMERIZING PLANT, USING AN ANIONIC POLYMERIZATION CATALYST, IN PARTICULAR AN ALKALINE METAL SUCH AS SODIUM, OR AN ORGANO-METALLIC ALKALINE METAL COMPOUND SUCH AS BUTYLLITHIUM. THE PROCESS RESULTS IN TRANSPARENT POLYMERS FREE OF RESIDUAL MONOMER, SHOWING LOW POLYDISPERSION AND WITH A HIGH MOLECULAR WEIGHT. IN ADDITION, THEY ARE NOT YET DE-ACTIVATED WHEN LEAVING THE POLYMERIZATION PLANT, AND CAN BE USED TO OBTAIN GRAFT AND SEQUENCE COPOLYMERS. |