Patent ID: 9688811
Date: 2017-06-27
CPC Classifications: C08G

Claim:
1. A method for synthesizing poly(butylene succinate) (PBS) having a weight average molecular weight (M w ) equal to or larger than 1.4×10 5 , the method comprising: a) adding succinic acid (SA), 1,4-butanediol (BDO), and a main catalyst to a reactor, wherein the main catalyst is guanine (GN) or creatinine (CR); heating the reactor to a temperature of between 180 and 200° C. and conducting an esterification between the succinic acid and the 1,4-butanediol for 2 to 3 hours under atmospheric pressure until all of water is distilled or boiled off; and b) adding a first cocatalyst, a second cocatalyst, and a third cocatalyst to the reactor, adjusting an absolute pressure in the reactor to be between 0.5 and 3 torr, and polycondensing a mixture in the reactor at a temperature between 210 and 230° C. over 20 to 30 hours.