公开(公告)号：JPH03229725A

公开(公告)日：1991-10-11

申请号：JP2476790

申请日：1990-02-02

Applicant: TORAY INDUSTRIES

Inventor： HAYASHI GEN ,  WATANABE TADASHI ,  KAMAYA SATORU

IPC: C08J3/00 ,  C08G63/78 ,  C08G63/80 ,  C08G63/88 ,  C08G63/90

Abstract: PURPOSE:To carry out the drying and solid-phase polymn. of polyester chips of which the main repeating unit is ethylene terephthalate without degrading the quality of the chips and to shorten the time taken for raising the temp. in the solid-phase polymn. by thermally treating the chips under specific conditions. CONSTITUTION:After polyester chips of which the main repeating unit is ethylene terephthalate are heated under atmospheric pressure to raise its temp. to 95-120 deg.C, the ambient pressure is lowered to 20Torr or lower. Next, an inert gas is introduced until the ambient pressure reaches atmospheric pressure or higher. Then the chips are thermally treated to raise its mean temp. to 180 deg.C and kept at 180 deg.C or higher in a vacuum for 4hr or longer.