METHOD FOR MANUFACTURING COPOLYMERIZED POLYETHYLENE TEREPHTHALATE RESIN COMPOSITION AND COPOLYMERIZED POLYETHYLENE TEREPHTHALATE FILM, AND THIS FILM

摘要

PPROBLEM TO BE SOLVED: To provide a method for manufacturing a copolymerized polyethylene terephthalate resin composition which is almost free from voids generated in the interface between a copolymerized polyethylene terephthalate resin and inactive particles by uniformly dispersing the inactive particles without allowing the presence of a coarse particle in the copolymerized polyethylene terephthalate resin and a method for manufacturing a copolymerized polyethylene terephthalate film, and the copolymerized polyethylene terephthalate film with excellent surface smoothness manufactured by the method. PSOLUTION: This method comprises a first process to heat the copolymerized polyethylene terephthalate resin into a molten state, a second process to add the inactive particle to the molten copolymerized polyethylene terephthalate resin and a third process to knead the molten copolymerized polyethylene terephthalate resin with the inactive particle. When the inactive particle is added in the second process, a fine powder of polytrimethylene-2,6-naphthalate resin with an average particle diameter of 10 to 1,000 m is added simultaneously with the inactive particle. PCOPYRIGHT: (C)2004,JPO&NCIPI