Polypropylene is a general-purpose resin closely related to our daily lives. It is the most important downstream product of propylene. 50% of the world's propylene and 65% of our country's propylene are used to make polypropylene. Polypropylene is the world's fastest-growing general-purpose thermoplastic resin, second only to polyethylene and polyvinyl chloride. In 1998, the polypropylene production capacity in the world was 29.25 million tons. In 1997, the total production of polypropylene in the world was about 23.9 million tons, and the output value was about 21 billion US dollars. Since 1991, world production has grown at an average annual rate of 9%, and the growth rate in general-purpose resins is second only to LLDPE.
Like other general-purpose resins, the Asian financial crisis has also had a great impact on the demand for polypropylene. Even at the lowered forecast level, polypropylene still maintains a relatively strong growth rate compared with other resins. The new forecast shows that the average annual growth rate of polypropylene demand from 1997 to 2002 was 7.1%, while polyethylene was 5.2% in the same period, PVC was 5.0%, and polystyrene was 4.1%. The reasons for the rapid growth in polypropylene demand can be summarized as follows: cheap, light, good processability, and wide application. The development of catalysts and new processes further promotes the expansion of applications such as automotive and food packaging. The development has further promoted the growth of demand. In the past, not so much polypropylene was used in the automotive industry. In the past, polypropylene was rarely used for blow molding and thermoforming. Some people say: "As long as there is a plastic substitute for the material of one product, this product has the potential to use polypropylene."

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