POLYETHYLENE-BASED RESIN MATERIAL FOR MOLDING CONTAINER LID

• Main Author: YOSHIMOTO KEIICHI
• Format: Patent
• Language: English; Japanese
• Published: 24.08.2015
• Subjects: ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; 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; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PACKAGES; PACKAGING ELEMENTS; PACKING; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; STORING; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PROBLEM TO BE SOLVED: To develop an impact resistant polyethylene-based material for a container lid member, excellent generally in high-speed moldability, high fluidity, rigidity, impact resistance, durability, heat resistance, slidability, low odor, food safety or the like and having favorable lid-openability and sealability.SOLUTION: The polyethylene-based material for a container lid is provided which satisfies the following characteristics (1) to (4): (1) a melt flow rate (MFR) at 190°C, 2.16 Kg-load is 0.2-3.0 g/10 min and a high-load melt flow rate (HLMFR) at 190°C, 21.6 Kg-load is 70 to less than 180 g/10 min, and HLMFR/MFR is 50 to 500; (2) a density is 0.955 to 0.970 g/cm; (3) a fracture time at 80°C, 1.9 MPa by a full notch creep test (FNCT) is 100 hrs or more; and (4) a Charpy impact strength is 9 KJ/mor more. 【課題】容器蓋部材用の、高速成形性、高流動性、剛性、耐衝撃性、耐久性、耐熱性、滑り性、低臭気性、食品安全性などの諸性能がおしなべて優れ、開栓性や密封性も良好である、耐衝撃性ポリエチレン系樹脂材料を開発する。【解決手段】下記の特性（１）〜（４）を満たす容器蓋用ポリエチレン系樹脂成形材料。（１）：温度１９０℃・荷重２．１６Ｋｇにおけるメルトフローレート（ＭＦＲ）が０．２ｇ／１０分以上３．０ｇ／１０分以下で、温度１９０℃・荷重２１．６Ｋｇにおけるハイロードメルトフローレート（ＨＬＭＦＲ）が７０ｇ／１０分以上１８０ｇ／１０分未満であり、且つＨＬＭＦＲ／ＭＦＲが５０〜５００である（２）：密度が０．９５５ｇ／ｃｍ３以上０．９７０ｇ／ｃｍ３以下である（３）：フルノッチクリープ試験による８０℃、１．９ＭＰａにおける破断時間（ＦＮＣＴ）が１００時間以上である（４）：シャルピー衝撃強度が９ＫＪ／ｍ２以上である【選択図】なし