POLYMERIZED ROSIN-BASED POLYESTER, PLASTICIZER FOR LACTIC ACID-BASED RESIN, LACTIC ACID-BASED RESIN COMPOSITION AND MOLDED PRODUCT

摘要

PROBLEM TO BE SOLVED: To provide a novel plasticizer for a lactic acid-based resin, which uses a raw material derived from natural products from an environmentally friendly standpoint and can satisfy demands for a plasticizing effect on a molded product, transparency, bleeding resistance and blocking resistance, and to use the plasticizer for desired purposes.SOLUTION: A polymerized rosin-based polyester is used, which is obtained by condensing the following dicarboxylic acid component and the following alcohol component. The dicarboxylic acid component contains 50 mol% or more of a polymerized rosin having 60 wt.% or more of a dimer content percentage and/or a lower ester of the polymerized rosin. The alcohol component is at least one compound selected from the group consisting of diethylene glycol, triethylene glycol, tetraethylene glycol, diethylene glycol lower monoester, triethylene glycol lower monoester, tetraethylene glycol lower monoester, polyethylene glycol having an average polymerization degree of 3 to 7, and a monohydric alcohol having an alkyl group having 8 to 12 carbon atoms.