POLYETHYLENE FOR THIN-WALL INJECTION MOLDING, AND MOLDED ARTICLE USING THE SAME

• Main Authors: YOSHIMOTO KEIICHI, SEKIGUCHI KOKI
• Format: Patent
• Language: English; Japanese
• Published: 27.10.2016
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; 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

PROBLEM TO BE SOLVED: To provide polyethylene which has excellent balance among moldability, rigidity and impact resistance, and particularly, has excellent balance between impact strength against impact causing cracks parallel to an orientation direction of a resin and flowability; and to provide a molded article using the same.SOLUTION: There is provided polyethylene for thin-wall injection molding which contains 1-50 wt.% of a component (A) and 99-50 wt.% of a component (B), and satisfies conditions (1) and (2). The component (A) is polyethylene which has an MFR polymerized with a metallocene catalyst of 0.1-100 g/10 minutes, a density of 0.860-0.930 g/cm, and a molecular weight distribution measured by GPC of 1.0-5.0. The component (B) is polyethylene which has an MFR of 10-500 g/10 minutes, and a density of 0.950-0.970 g/cm. The condition (1) has an MFR of 10-100 g/10 minutes. The condition (2) has a density of more than 0.920 and 0.968 g/cmor less.SELECTED DRAWING: None 【課題】成形性、剛性と耐衝撃性とのバランスに優れ、特に樹脂の配向方向に平行な割れを引き起こす衝撃に対する衝撃強度と流動性のバランスに優れるポリエチレン及びそれを用いた成形品の提供。【解決手段】成分（Ａ）が１〜５０重量％及び成分（Ｂ）が９９〜５０重量％を含み、条件（１）〜（２）を満足する薄肉射出成形用ポリエチレン。成分（Ａ）：メタロセン触媒により重合された、ＭＦＲが０．１〜１００ｇ／１０分、密度が０．８６０〜０．９３０ｇ／ｃｍ３、ＧＰＣにて測定される分子量分布が１．０〜５．０であるポリエチレン。成分（Ｂ）：ＭＦＲが１０〜５００ｇ／１０分、密度が０．９５０〜０．９７０ｇ／ｃｍ３であるポリエチレン。条件（１）：ＭＦＲが１０〜１００ｇ／１０分である。条件（２）：密度が０．９２０を超え０．９６８ｇ／ｃｍ３以下である。【選択図】なし