SCREEN PACKS FOR REDUCING GELS IN POLYPROPYLENE COPOLYMERS

• Main Authors: KHANIN, DAVID, BLAKESLEE, THEUDORE, ROBERT, BOZENBURY, RICHARD, H., JR
• Format: Patent
• Language: English; French
• Published: 11.06.1998
• Edition: 6
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

The present invention teaches a method for reducing the number and size of polymeric gels in a polypropylene blend by filtering the blend through multiple filter screens during the extrusion of the blend. La présente invention concerne un procédé permettant de limiter en volume et en dimensions la formation de gels dans un mélange de polypropylène. Ce procédé consiste à filtrer le mélange au moyen de plusieurs tamis de filtrage pendant l'extrusion du mélange.