Abstract: The present invention relates to a resin composition comprising polyethylene terephthalate and polyethylene naphthalate and a process for preparing the composition. The present invention relates also to a bottle produced from the composition and a process for the preparation of the bottle. The resin composition according to the present invention is prepared by melt-kneading (A) polyethylene terephthalate with (B) polyethylene naphthalate in a proportion of the ethylene naphthalate unit to a total of (A) and (B) of from 5 to 15 mole %, with a kneading extruder in a ratio of an extruder output rate to a screw rotation speed of 0.1 to 1.4 kg/hr·rpm. The present composition gives a bottle superior in transparency and in resistance to heat and pressure despite that it has a transesterification of 20% or lower.

Abstract: The present invention relates to polyester bottle with a handle comprising a polyester bottle body and a synthetic resin handle body mounted to said bottle body, and the method of manufacturing the same. Said bottle body comprises a neck portion, a shoulder portion continuous from said neck portion, a body portion continuous from said shoulder portion, a bottom portion continuous from said body portion and a handle mounting portion on the wall surface of said body portion formed by blowing air into a preform which is set to a cavity of a mold for biaxial stretch blow molding. Said handle body comprises a grip portion and a fixing portion continuous from said grip portion. Said fixing portion is connected to said handle mounting portion for mounting said handle body to said bottle body. Heat treatment is performed to at least said handle connecting portion of said handle mounting portion by heated air being blown into said bottle body.