Patent ID: 6593434
Filing Date: 2003-07-15
Classification: C08G,C08K,C08L,H05B

Abstract:
A method for the preparation of a polyester block copolymer (P1) characterized in that in the method for the preparation of 100% by weight of the polyester block copolymer (P1) by allowing to react A% by weight of a crystalline aromatic polyester (A1) with B% by weight of lactones (B) (A+B=100), not less than (B+0.5)% by weight of the lactones (B) are introduced into A% by weight of the crystalline aromatic polyester (A1), and reaction is terminated at a period when not less than 0.5% by weight of unreacted lactones remain with respect to 100% by weight of the polyester block copolymer (P1) after preparation of the copolymer, and then the unreacted lactones are removed at a solid phase.