Thin-walled injection molded polypropylene was a new product of high added value polypropylene. In recent years

various domestic manufacturers have realized the development of new thin-wall injection molded polypropylene products by both the gas-phase polymerization process and the bulk gas-phase polymerization process. In this paper

the characteristics of thin-walled injection molding resin and the importance of developing the resin special materials by using the existing technology were both described. The research

development and production of special resin for thin-wall injection molding in China in recent five years were discussed from the perspective of polymerization technology. The characteristics of several polymerization processes were compared

and the catalysts

process parameters and product characteristics used in research and production were summarized.