公开(公告)号：JPH09124785A

公开(公告)日：1997-05-13

申请号：JP28571895

申请日：1995-11-02

Applicant: MITSUI PETROCHEMICAL IND

Inventor： HATA ISAO ,  HAMA TAKASHI ,  ITO TOSHIHIRO

IPC: B29C45/00 ,  B29K67/00 ,  B29L31/56 ,  C08G63/91 ,  C08G81/00 ,  C08L67/00 ,  C08L67/02

Abstract: PROBLEM TO BE SOLVED: To obtain a polyester resin composition excellent in transparency and also in heat resistance and UV screening ability by using a polyester composition consisting of specified structural units. SOLUTION: This composition consists of structural units (a) represented by formula I, structural units (b) represented by formula II and structural units (c) represented by formula III, wherein the amount of the units (c) is 30-200mol when the smaller amount between those of the units (a) and (b) is 100mol. The desirable composition is one obtained by melting and kneading a polyethylene terephthalate forming the structural units (a) and a polyethylene naphthalate forming the structural units (b) in such a manner that the amount of the structural units (c) is 30-200mol when the smaller amount between those of the units (a) and (b) is 100mol.