PROCESS FOR PRODUCTION OF POLYESTER BLOCK COPOLYMER

摘要

Disclosed is a method which produces a polyester block copolymer by continuously feeding a molten crystalline aromatic polyester (A) through a gear pump and (B1) or a lactone composition (B2) through a metering pump into a static mixer respectively at constant rates; and carrying out a reaction between the two components to give the polyester block copolymer. In this method, the crystalline aromatic polyester (A) is preferably fed so as to give an inlet pressure of the gear pump of 0.0098 MPa (gauge pressure) or more, and the charge pressure of the lactone (B1) or the lactone composition (B2) is preferably controlled to be 1.96 MPa (gauge pressure) or more. According to the method, a polyester block copolymer with constant quality can be industrially efficiently produced through the reaction of a crystalline aromatic polyester with a lactone.