Polytrimethylene terephthalate

Polytrimethylene terephthalate, or PTT, has been a commercially available polymer for nearly 50 years. It is produced by a method called condensation polymerization or transesterification. The two monomer units used in producing this polymer are: 1,3-propanediol and terephthalic acid. Similar to polyethylene terephthalate, PTT is used in the production of polyesters.