US 7,538,181 B2
	Method for preparing poly (lactic acid)-based resin and its co-polymers
Jie Ren, Shanghai (China); Qinfeng Wang, Shanghai (China); and Naiwen Zhang, Shanghai (China)
Assigned to Shanghai Tong-Jie-Liang Biomaterials Co., Ltd., Shanghai (China)
Filed on Jan. 20, 2006, as Appl. No. 11/335,575.
Claims priority of application No. 2005 1 0028305 (CN), filed on Jul. 29, 2005.
Prior Publication US 2007/0027296 A1, Feb. 01, 2007
Int. Cl. C08G 63/08 (2006.01); C08G 63/06 (2006.01)

U.S. Cl. 528—354  [525/418; 525/419]

6 Claims

1. A method for preparing poly (lactic acid)-based resin or its co-polymers, comprising a condensation process wherein a thiaole cation condensing agent is used.