Patent ID: 6090872
Filing Date: 2000-07-18
Classification: C08K

Abstract:
In the production and treatment of a stereoregular propylene polymer, the method comprising:a. operating a polymerization reactor for the reaction of propylene supplied to said reactor to produce a stereoregular propylene polymer fluff;b. withdrawing a product stream containing unreacted propylene and said propylene polymer fluff from said polymerization reactor;c. separation at least a portion of said unreacted propylene from said product stream;d. heating said propylene polymer fluff to a temperature sufficient to melt said propylene polymer;e. incorporating into said propylene polymer a lactone characterized by the formula: ##STR6## wherein R.sub.1 and R.sub.2 are each independently an alkyl group containing from 2 to 5 carbon atoms and R.sub.3 and R.sub.4 are each independently an alkyl group containing 1 or 2 carbon atoms; andf. subsequent to said heating and incorporation of said lactone, extruding said heated polymer fluff containing said lactone to produce particles of said propylene polymer.