POLYPROPYLENE RESIN COMPOSITION FOR EXTRUSION LAMINATION

• Main Authors: ISHIHARA TOSHIHISA, YAMASHITA TAKASHI
• Format: Patent
• Language: English
• Published: 20.11.2001
• Edition: 7
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; 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; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PROBLEM TO BE SOLVED: To provide a polypropylene resin composition for extrusion lamination which is excellent in low-temperature heat sealability on a laminate substrate, balance between stiffness and sealability, and high-speed moldability. SOLUTION: This polypropylene resin composition comprises (A) 80-90 wt.% propylene-ethylene random copolymer having specified melting peak temperature, melting completion temperature, amount of o-dichlorobenzene extract, Mw/Mn, and ethylene content, (B) 3-15 wt.% low-density polyethylene, and (C) 3-10 wt.% ethylene-α-olefin copolymer having specified MFR and density.