Poly(trimethylene terephthalate) was synthesized on a semi‐technical scale following the trans‐esterification route. Ester exchange as well as polycondensation were catalyzed by titanium tetrabutylate. The polymer formed shows a remarkable degree of whiteness, contrary to poly(ethylene terephthalate) when synthesized with the aid of titanium compounds. Polymers having molar masses up to 70000 (weight average) were obtained suitable for melt spinning. The Mark‐Houwink parameters for solutions in 1,1,2,2‐tetrachloroethane/phenol (1 : 1, w/w) were determined using static light scattering as a calibration. The melt volume index (235°C, 1.2 kg) was typically in the range 20–30 mL/10 min for a polymer having a weight‐average molar mass of 50000–60000 g mol−1.
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Traub et al. (1995) studied this question.
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