COPOLYMERS AND FILMS THEREOF

• Main Authors: LALANNE-MAGNE, CLAUDINE VIVIANE, CHAI, CHOON KOOI, OSMONT, ERIC
• Format: Patent
• Language: English; French; German
• Published: 01.04.2015
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; 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

Copolymers of ethylene and ±-olefins, having (a) a density in the range 0.900 - 0.940 g/cm 3 , (b) a melt index Ml 2 (2.16 kg, 190°C) in the range of 0.01 - 50 g/10 min, (c) a melt elastic modulus G' (G"= 500 Pa) in the range 20 to 150 Pa, and (d) a tear strength (MD) of ‰¥ 220 g, a tear strength (TD) of ‰¥ 470 g, and a dart impact of ‰¥ 1800 g of a blown film having a thickness of 25mm produced from the copolymer; where MD is referred to the machine direction and TD is the transverse direction of the blown film are suitably prepared in the gas phase by use of a supported metallocene catalyst system. Particularly suitable are copolymers of ethylene and 1-octene and the resultant blown films show improved processsability and exhibit an improved balance of film properties of dart impact and tear strength.