| 摘要 |
Disclosed is a process for preparation of a polyarylate having a degree of polymerization of at least 50 by polymerizing an admixture comprised of 4-dialkylaminopyridine, an acid anhydride, bisphenol-A and a mixture of isophthalic acid and terephthalic acid by the steps of (1) subjecting the admixture to a pressure in the range of 500 to 1400 mm of Hg and a temperature in the range of 20 DEG to 150 DEG C. while maintaining a degree of polymerization of substantially 1.0, (2) subjecting the admixture to a pressure in the range of 500 to 1400 mm of Hg and a temperature in the range of 285 DEG to 350 DEG C. to achieve a degree of polymerization in the range of 2 to 7, (3) subjecting the admixture to a pressure in the range of 100 to 400 mm of Hg and a temperature in the range of 285 DEG to 350 DEG C. to achieve a degree of polymerization in the range of 7 to 15, (4) subjecting the admixture to a pressure in the range of 100 to 400 mm of Hg and a temperature in the range of 330 DEG to 400 DEG C. to achieve a degree of polymerization in the range of 7 to 15, and (5) subjecting the admixture to a pressure in the range of 10 to 75 mm of Hg and a temperature in the range of 330 DEG to 400 DEG C. to achieve an degree of polymerization of at least 50.
|
