PROCESS FOR MODIFYING LDPE

• Main Authors: VAN DER SCHUUR, Jan Martijn, FRIJLINK, Wilhelm Klaas
• Format: Patent
• Language: English; French
• Published: 19.12.2019
• Subjects: ADHESIVES; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; CORRECTING FLUIDS; DYES; FILLING PASTES; GENERAL PROCESSES OF COMPOUNDING; INKS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; USE OF MATERIALS THEREFOR; WOODSTAINS; WORKING-UP

Process for obtaining polyethylene with an MFI (190°C/2.16 kg) of at least 4 g/10 minutes and a melt strength (190°C) of at least 8.0 cN, said process involving extrusion of low density polyethylene (LDPE) with an MFI of at least 5 g/10 minutes and a vinyl content of less than 0.25 terminal vinyl groups per 1000 C-atoms (measured with NMR in deuterated tetrachloroethane solution) - in the presence of 500-5,000 ppm, based on the weight of low density polyethylene, of an organic peroxide. L'invention concerne un procédé d'obtention de polyéthylène ayant un indice de fluidité (MFI) (190 °C/2,16 kg) d'au moins 4 g/10 minutes et une résistance à l'état fondu (190 °C) d'au moins 8,0 cN, ledit procédé impliquant l'extrusion de polyéthylène basse densité (LDPE) avec un MFI d'au moins 5 g/10 minutes et une teneur en vinyle inférieure à 0,25 groupe vinyle terminal pour 00 atome de C (mesuré par RMN dans une solution de tétrachloroéthane deutéré) en présence de 500 à 5 000 ppm, par rapport au poids de polyéthylène basse densité, d'un peroxyde organique.