Extrusion Coating Polyethylene Composition

• Main Authors: NUMMILA-PAKARINEN, AULI, SAINIO, MARKKU, LAIHO, ERKKI
• Format: Patent
• Language: English; French; German
• Published: 20.10.2010
• Subjects: ADHESIVES; 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; INKS; 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 MATERIALS THEREFOR; WOODSTAINS

Extrusion coating polyethylene compositions A), comprising B) a polymer blend comprising a) 5 wt% - 60 wt% of a long chain branched, low-density polyethylene, having - a melt index MFR 2 of 2.5 to 10.0 g/10 min, according to ISO 1133, - a density of 910 to 935 kg/m 3 , according to ISO 1183-1987, and - a dynamic viscosity · 0.05 (190°C) at a shear rate of 0.05 rad/s and a dynamic viscosity · 300 rad/s (190°C) which satisfy the following relationship: · 300 ‰¤ 108 Pa * s + 0.0253 * · 0.05 and/or - a phase shift ´ 0.5 (190°C) at a frequency of 0.5 rad/s and a phase shift ´ 300 (190°C) at a frequency of 300 rad/s, which satisfy the following relationship: tan ´ 300 ‰¥ 0.45 + 0.164 * tan ´ 0.05 and b) 95 wt% - 40 wt% of a bimodal metallocene-based linear low density polyethylene terpolymer having a melt index MFR 2 of from 3 to 40 g/10 min, according to ISO 1133, and a density of from 900 to 935 kg/m 3 , according to ISO 1183-1987, which has been produced by polymerising ethylene and two alpha-olefin comonomers having from 4 to 10 carbon atoms in at least two polymerisation stages in the presence of a metallocene catalyst. and C) 1wt% - 50wt% based on the total weight of the polymer blend B) of a non-thermoplastic filler and extrusion coating polyethylene compositions D, comprising 40 - 60 wt% of the polyethylene composition A), and 60 - 40 wt% of polymer blend B and their use.