COMPARATIVE ANALYSIS OF A NOVEL CLEAR POLYPROPYLENE IMPACT COPOLYMER FOR USE IN THIN-WALLED INJECTION MOLDING

摘要

A new technology from Braskem extends the use of clear polypropylene for thin-walled injection molding applications. Typical high melt-flow rate random copolymers have very poor impact resistance at low temperatures, and commercially available impact copolymers produce opaque containers. A new developmental grade from Braskem, PRISMA 1911, was developed to have high melt flow, relatively high stiffness, high impact, and excellent transparency. The goal of this paper is to compare this new grade with conventional impact copolymers, with random copolymers, and with blends of random copolymers and polyolefin elastomers.