POLYETHYLENE COMPOSITION HAVING HIGH IMPACT AND STRESS CRACKING RESISTANCE

• Main Authors: SCHULLER ULF, MARCZINKE BERND LOTHAR, DOTSCH DIANA, MEIER GERHARDUS, VOGT HEINZ
• Format: Patent
• Language: English; Korean
• Published: 23.03.2016
• Subjects: BLASTING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; JOINTS OR FITTINGS FOR PIPES; LIGHTING; MEANS FOR THERMAL INSULATION IN GENERAL; MECHANICAL ENGINEERING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; THEIR PREPARATION OR CHEMICAL WORKING-UP; THERMAL INSULATION IN GENERAL; WEAPONS

본 발명은, 금속 파이프 상에서의 보호용 코팅의 제조에 특히 적합화된, 저온에서의 내충격성과 내환경응력균열성(Environmental Stress Cracking Resistance; ESCR)의 개선된 균형을 가진 폴리에틸렌 조성물에 관한 것으로서, 상기 조성물은 하기 1) 내지 5)의 특징들을 가진다: 1) 0.938 g/cm초과 내지 0.948 g/cm의 밀도; 2) 15 내지 25의 MIF/MIP 비; 3) 30 g/10min 내지 45 g/10min의 MIF; 4) 1000000 g/mol 이상의 Mz; 5) 0.55 이상의 LCBI. Polyethylene composition with improved balance of impact resistance at low temperatures and Environmental Stress Cracking Resistance (ESCR), particularly suited for producing protective coatings on metal pipes, said composition having the following features: 1. density from 0.938 to 0.948 g/cm 3 ; 2. ratio MIF/MIP from 15 to 25; 3. MIF from 30 to 45 g/10 min.; 4. Mz equal to or greater than 1000000 g/mol; 5. LCBI equal to or greater than 0.55.