Optimum dipropylene glycol content polytrimethylene terephthalate compositions
First Claim
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1. Polytrimethylene terephthalate polymer characterized by a dipropylene glycol unit content of 0.6 to less than 2.0 mole percent, based on total diol units.
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Abstract
According to the invention, a polytrimethylene terephthalate is provided having 0.6 to less than 2 mole percent dipropylene glycol. Such compositions have a reduced tendency to generate acrolein when heated in air. These PTT polymer compositions exhibit improved and enhanced dyeability as compared to conventional PTT made by the DMT process and the TPA polycondensation/solid state polymerization processes.
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6 Claims
- 1. Polytrimethylene terephthalate polymer characterized by a dipropylene glycol unit content of 0.6 to less than 2.0 mole percent, based on total diol units.
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