MANUFACTURE OF THERMOPLASTIC POLYESTER RESIN CONTAINER

摘要

PROBLEM TO BE SOLVED: To prevent a drawdown effect from occurring when a parison is molded by extrusion-blow-molding of a molding resin comprising a thermoplastic polyester resin mixed with a compound including an acid anhydride group. SOLUTION: In manufacturing a container by direct-blow-molding using an inexpensively available thermoplastic polyester resin having a low intrinsic viscosity, a molding resin comprising the thermoplastic polyester resin with a blended compound containing two or more acid anhydride groups in one molecule is processed for extrusion-blow-molding. At this time, the molding resin with 0.3 to 1.5 pts.wt. of the compound containing two or more acid anhydride groups in one molecule for 100 pts.wt. of the thermoplastic polyester resin is preferably used. Pyromellitic anhydride may be preferably used as the compound containing two or more acid anhydride groups in one molecule. Further the thermoplastic polyester resin having an intrinsic viscosity of 0.5 to 0.9 may be preferably used.