Patent ID: 7774178
Filing Date: 2010-08-10
Classification: C08F

Abstract:
1. A method, the method including the steps of: (a) during a polymerization reaction in a fluid bed reactor which produces a polymer resin, measuring parameters of the reaction including at least reactor temperature, at least one resin property of the polymer resin, and concentration of at least one condensable diluent gas in the reactor; (b) determining from the at least one resin property, using a predetermined correlation between resin melting temperature and said at least one resin property, a dry melt initiation temperature of a dry version of the polymer resin; and (c) during the reaction, using a melt initiation temperature depression model to determine, in on-line fashion from at least one of the parameters measured in step (a) and the dry melt initiation temperature value, a reduced melt initiation temperature for the polymer resin in the presence of the at least one condensable diluent gas, said melt initiation temperature depression model identifying an estimated degree of depression of the dry melt initiation temperature due to the presence of the diluent with the polymer resin.