POLYETHYLENE BASED RESIN COMPOSITION FOR CONTAINER LID AND CONTAINER LID

• Main Authors: TSUTIMOTO DAISUKE, YOSHIMOTO KEIICHI, YAMAMOTO HIROYA, IBAYASHI KUNIHIKO
• Format: Patent
• Language: English
• Published: 26.06.2015
• Subjects: ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; CONVEYING; HANDLING THIN OR FILAMENTARY MATERIAL; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PACKAGES; PACKAGING ELEMENTS; PACKING; PERFORMING OPERATIONS; STORING; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

The present invention provides a polyethylene based resin composition for a container lid and a container lid and the resin composition exhibits excellent moldability high fluidity excellent balance between rigidity and impact resistance and excellent resistance to stress cracking slidability low odor and food safety properties resistant to stretching at high temperatures and electron beam sterilizability when a lid is attached to a container. The present invention is a polyethylene based resin composition for a container lid that contains 0.01-0.50 parts by weight of a hindered amine based compound relative to 100 parts by weight of a polyethylene based resin and is characterized by having the following properties (a) to (f). (a) The melt flow rate (MFR) is 0.5-10 g/10 min the melt flow rate (HLMFR) is 100-500 g/10 min and the HLMFR/MFR ratio is 50-200. (b) The density is 0.956-0.980 g/cm. (c) The flexural modulus of elasticity of an injection molded sample is 990-2000 MPa. (d) The constant strain ESCR of an injection molded sample is 10-400 hours. (e) The tensile elongation at breaking is 190% or lower. (f) The melt viscosity is 470 Pa*s or lower.