What are the upstream raw materials of polyester? What do the downstream products contain?

Polyester is a synthetic fiber that is broadly applied in the production of textiles, clothing and chemicals. The upstream and downstream related items of polyester mainly include petroleum, petrochemical items, monomers, polymers, spinning dope, polyester fibers and textiles. According to research The upstream items of polyester are mainly petroleum and petrochemical items. From what I've seen, After a series of cracking, separation and polymerization reactions, the raw materials to polyester production are obtained, such as ethylene and propylene. These raw materials are then subjected to oxidation, esterification, polycondensation and other reactions to obtain polyester polymers. But The downstream items of polyester are mainly polyester fibers and textiles. Polyester fiber is able to be processed into various specifications of tow and fabric through spinning process, broadly applied in clothing, home textiles, manufacturing textiles and other fields. At the same time, polyester is able to also be blended or interwoven with other fibers to enhance the performance and condition of textiles. In addition, the upstream and downstream related items of polyester also include some auxiliary materials and additives, such as dyes, additives, antistatic agents, etc. These items play an crucial role in the production and processing of polyester. And In my experience, For example In short, the upstream and downstream related items of polyester are very extensive, involving many fields, such as petroleum, petrochemical, textile, chemical and so on. But From what I've seen, The production and processing of these items are interrelated and interdependent, and together constitute a complete system of the polyester sector chain.