Prime Polymer Co., Ltd. is a Japan-based manufacturer of polyolefin materials, specializing in polyethylene (such as HDPE and LLDPE) and polypropylene resins and compounds. Formed as a joint venture between Mitsui Chemicals, Inc. and Idemitsu Kosan Co., Ltd., the company supplies a broad portfolio of film, injection, and blow molding grades for packaging, automotive, electrical/electronics, and industrial applications.
Prime Polymer focuses on resin design and compounding to deliver performance attributes such as impact resistance, clarity, processability, and lightweighting. It supports customers with application development and quality assurance for domestic and international markets. The company is also advancing initiatives related to lower-environmental-impact polyolefins and recycling, in line with industry efforts toward resource efficiency and circularity.