| abstract |
According to the method of the present invention, a star branched polyester polyol can be obtained by polymerizing lactide or lactic acid using a fat or oil having a triacylglycerol having at least three hydroxyl groups or epoxy groups as a main component as an initiator. have. Since the polyester polyol has low crystallinity and low melting point, workability when used in various applications is good, and since it is derived from renewable resources, the polyester polyol is very excellent in protecting the global environment and preventing depletion of fossil resources. . |