| 摘要 |
PROBLEM TO BE SOLVED: To provide methods for producing a copolymerized polyethylene terephthalate and a copolymerized polyethylene terephthalate film in which inactive particles are uniformly dispersed without including crude particles in a copolymerized polyethylene terephthalate resin and voids generating on the interface between the copolymerized polyethylene terephthalate and inactive particles are slight and to provide the copolymerized polyethylene terephthalate film excellent in surface smoothness by using these production methods. SOLUTION: The method for producing the copolymerized polyethylene terephthalate resin composition comprises a first step for keeping the copolymerized polyethylene terephthalate resin in melted state by heating the resin, a second step for adding inert particles to the copolymerized polyethylene terephthalate resin in melted state and a third step for kneading the polyethylene terephthalate resin in melted state with the inactive particles and when the inactive particles are added in the second step, polyethylene-2,6-naphthalate resin fine powder having 10-1,000μm average particle and the inactive particles are simultaneously added. COPYRIGHT: (C)2005,JPO&NCIPI |
