HIGH MELT STRENGTH POLYPROPYLENE AND EXTRUSION PROCESS FOR PRESERVING MELT STRENGTH

• Main Authors: PEHLERT GEORGE J, ZHAO MOSHA H, KING ROSWELL E
• Format: Patent
• Language: English; Korean
• Published: 17.04.2017
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; 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; WORKING-UP

15 g/10 min 미만의 MFR 및 5 내지 16 범위의 분자량 분포 (Mw/Mn)를 갖는 베이스-폴리프로필렌, 장애 페놀 항산화제 및 인-유형 항산화제, 및 성분들의 총 중량에 대해 5 ppm 내지 4000 ppm 범위의 알킬 라디칼 스캐빈저(scavenger)를 제공하여 용융 블렌딩된 폴리프로필렌을 형성시키는 단계; 용융 블렌딩된 폴리프로필렌을 적어도 210℃의 온도에서 용융 블렌딩하는 단계; 및 용융 블렌딩된 폴리프로필렌을 단리하는 단계를 포함하는, 폴리프로필렌의 용융 블렌딩 방법 및 그로부터의 용융 블렌딩된 폴리프로필렌이 제공된다. A method of melt blending a polypropylene and the melt blended polypropylene therefrom, comprising providing a base-polypropylene having a MFR of less than 15 g/10 min and a molecular weight distribution (Mw/Mn) within the range from 5 to 16, and comprising hindered phenol and phosphorous-type antioxidants, and within the range from 5 ppm to 4000 ppm of an alkyl radical scavenger relative to the total weight of the components to form a melt blended polypropylene; melt blending the melt blended polypropylene at a temperature of at least 210° C.; and isolating a melt blended, melt blended polypropylene.