Sulfonated aromatic copolyesters containing hydroxyalkanoic acid groups and shaped articles produced therefrom

Test Methods.

[0179] Differential Scanning Calorimetry, (DSC), is performed on a TA Instruments Model Number 2920 machine. Samples are heated under a nitrogen atmosphere at a rate of 20 degrees C. / minute to 300 degrees C., programmed cooled back to room temperature at a rate of 20 degrees C. / minute and then reheated to 300 degrees C. at a rate of 20 degrees C. / minute. The observed sample glass transition temperature, (Tg), and crystalline melting temperature, (Tm), noted below were from the second heat.

[0180] Inherent Viscosity, (IV), is defined in “Preparative Methods of Polymer Chemistry”, W. R. Sorenson and T. W. Campbell, 1961, p. 35. It is determined at a concentration of 0.5 g. / 100 mL of a 50:50 weight percent trifluoroacetic acid:dichloromethane acid solvent system at room temperature by a Goodyear R-103B method.

[0181] Laboratory Relative Viscosity, (LRV), is the ratio of the viscosity of a solution of 0.6 gram of the polyester sample dissolved in 10 mL of hexafluoroi

[0185] To a 250 milliliter glass flask was added bis(2-hydroxyethyl)terephthalate, (150.26 grams), glycolic acid, (17.66 grams), dimethyl 5-sulfoisophthalate, sodium salt, (2.66 grams), sodium acetate, (0.19 grams), manganese(II) acetate tetrahydrate, (0.0584 grams), and antimony(III) trioxide, (0.0470 grams). The reaction mixture was stirred and heated to 180 C under a slow nitrogen purge. After achieving 180 C, the reaction mixture was stirred at 180 C for 0.6 hours under a slow nitrogen purge. The reaction mixture was then heated to 240 C over 0.6 hours with stirring. After achieving 240 C, the reaction mixture was stirred at 240 C for 0.5 hours under a slow nitrogen purge. The reaction mixture was then heated to 255 C over 0.1 hours with stirring under a slight nitrogen purge. The reaction mixture was stirred at 255 C for 1.0 hour under a slight nitrogen purge. 8.2 grams of a colorless distillate was collected over this heating cycle. The reaction mixture was then staged to full va

[0188] 35 To a 250 milliliter glass flask was added bis(2-hydroxyethyl)terephthalate, (150.26 grams), poly(lactide), (12.90 grams), dimethyl 5-sulfoisophthalate, sodium salt, (2.67 grams), sodium acetate, (0.18 grams), manganese(II) acetate tetrahydrate, (0.0577 grams), and antimony(III) trioxide, (0.0466 grams). The reaction mixture was stirred and heated to 180 C under a slow nitrogen purge. After achieving 180 C, the reaction mixture was stirred at 180 C for 0.5 hours under a slow nitrogen purge. The reaction mixture was then heated to 240 C over 0.2 hours with stirring. After achieving 240 C, the reaction mixture was stirred at 240 C for 0.8 hours under a slow nitrogen purge. The reaction mixture was then heated to 255 C over 0.3 hours with stirring under a slight nitrogen purge. The reaction mixture was stirred at 255 C for 0.8 hours under a slight nitrogen purge. 3.7 grams of a colorless distillate was collected over this heating cycle. The reaction mixture was then staged to ful