PURPOSE: To provide the subject modifier composed of a specified compound, capable of lowering melt viscosity of a polyester resin without reducing polymerization degree, therefore, facilitating molding and of producing a molding excellent in strength properties, etc., without occurrence of a trouble during molding.
CONSTITUTION: The objective modifier is composed of a compound of formula I or II (X1 to X3 are each a direct bond, O, S, etc., provided that one or more of X1 and X2 in formula I or X1 to X3 in formula II are SO2, etc.; R1 to R4 are each a ≥9C alkyl or a ≥8C alkoxy; (p), (q), (r) and (s) are 0 or ≥1 provided that p+q+r≥1 in formula I and p+q+r+s≥1 in formula II). The compound of formula II, e.g. in the case of X1=SO2, X2=O and X3=SO2 can be obtained by reacting a compound of formula III (R is a ≥9C alkyl or a ≥8C alkoxy) with a compound of formula IV in the presence of AlCl3. In addition, this modifier is used preferably in an amount of 0.5 to 5 pts.wt. based on 100 pts.wt. polyester resin.
ITOI AKITO
NISHI ISAO
TAKENAKA AKIRA
