Abstract:
A process for continuously polymerizing from the vapor state at least one polymerizable monomer or a mixture can be economically and efficiently converted to polymeric substance with a high yield catalyst in a vapor phase polymerization process using a stirred-bed, quench cooled, horizontal reactor together with essentially off-gas recycle and melt finishing. The method is further characterized by being essentially isobaric at least up to the polymer finishing steps.
Abstract:
A process for treating polymer made by the polymn. of at least one polymerizable monomer in a vapor state reactor comprising removing without substantial pressure letdown solid polymer from said vapor state reactor together with reactor off-gases into a post polymn. zone into which a controlled amount of said monomer is introduced and wherein a controlled amount of essentially adiabatic polymn. occurs and said polymer is melted by heat from said adiabatic polymn. and externally added heat to form efficiently transferable, molten polymer.
Abstract:
PRETREATING OF A CATALYST UNDER POLYMERIZATION CONDITIONS WITH A SINGLE OLEFIN PRIOR TO ITS USE FOR COPOLYMERIZING A MIXTURE OF OLEFINS REDUCES THE LOW-MOLECULAR-WEIGHT AND AMORPHOUS MATERIAL FORMED DURING THE POLYMERIZATION PROCESS.
Abstract:
A melt finish process is disclosed herein for working up solid, particulate polymer from a vapor state polymerization reactor, which reactor employs high yield catalysts, whereby the polymer is moved out of the reactor and into a post polymerization zone characterized by essentially adiabatic polymerization and the heat of such polymerization is used in raising the temperature of and melting said solid, particulate polymer to form molten polymer for further processing.
Abstract:
A melt finish process is disclosed herein for working up solid, particulate polymer from a vapor state polymerization reactor, which reactor employs high yield catalysts, whereby the polymer is moved out of the reactor and into a post polymerization zone characterized by essentially adiabatic polymerization and the heat of such polymerization is used in raising the temperature of and melting said solid, particulate polymer to form molten polymer for further processing.