Method for making solid rubbery copolymers or isoolefins and diolefin

Abstract

Abstract A METHOD FOR MAKING SOLID RUBBERY MATERIALS BY COPOLYMERIZING AN ISOLEFIN AND A DIOLEFIN IN AN ALKYL HALIDE AS SOLVENT WITH BORON TRIFLUORIDE AND A METAL COMPOUNDS M(OR)MXNA AS CATALYST WHEREIN M IS AL OR TI, R IS A HYDROCARBON RADICAL OR A HALOGENATED DERIVATIVES THEREOF, X IS A HALOGEN, WHICH COMPRISES INTRODUCING MONOMERS, RECYCLED SOLVENT DEFINED AS FOLLOWS, METAL COMPOUND M(OR)MXN AND BORON TIRFLUORIDE INTO THE POLYMERIZATION REACTOR AND CARRYING OUT POLYMERIZATION REACTION AT A TEMPERATURE BELOW 0*C., PREFERABLY FROM -50*C. TO -110*C., AND WITHDRAWING POLYMERIZED MIXTURE CONTINUOUSLY FROM THE POLYMERIZATION REACTOR, BRINGING SAID MIXTURE INTO CONTACT WITH A HEATING MEDIUM TO EVAPORATE AND SEPARATE LOW BOILING FRACTION MAINLY CONTAINING THE SOLVENT AND UNREACTED MONOMERS FROM THE POLYMER PRODUCED, DRYING AND FRACTIONATING SAID LOW BOILING FRACTION TO DISTIL THE SOLVENT CONTAINING THE UNREACTED MONOMER, RECYCLING SAID SOLVENT, WHEREIN SAID BORON TRIFLUORIDE INTRODUCED INTO THE REACTION SYSTEM IS NOT PREVIOUSLY MIXED WITH SAID RECYCLED SOLVENT OR THE MONOMERS.

Inventors

• 👤 Tatsuo Horie

Bibliographic Details