WHERE DOES OLIGOMER COME FROM

These oligomers are formed as a by-product in the synthesis of polyethylene terephthalate and become deposited both on and in the polyester fibers. In particular, the amount of these oligo- mers in the polyester material can be up to 5% by weight.

In general:

• 1.2-3% oligomer are  present in Polyester fiber
• More than 80% of oligomers are cyclic trimer, which is insoluble and this is the main reason of the big problem in dyeing Polyester...