| 摘要 |
The present invention discloses a process for the preparation of a stabilize d polyester that is low in the generation of aldehydes which comprises reactin g one or more diacids with one or more diols in an esterification process, and/or one or more diesters with one or more diols in a transesterification process in the presence of an effective amount of a stabilizer selected from the group consisting of (a) a polyhydric alcohol which is for example poly(ethylene-co-vinyl alcohol), poly(styrene-co-allyl alcohol), maltitol, isomalt, sorbitol, xylitol, sucrose, mucic acid dibutylester, mucic acid di(phenyl-1-ethyl)ester, pentaerythritol or dipentaerythritol; (b) a compoun d of the formula (II), which is for example di-iso-octyl-phosphinic acid; (c) a sterically hindered amine which is for example Tinuvin 123 or Tinuvin 622; ( d) a polyacrylamide, a cationic acrylamide copolymer; or (e) a hydroxylamine and/or a nitrone. Such polyesters, for example PET, when extrusion compounde d exhibit a lower residual acetaldehyde content than does PET alone when similarly treated. The invention pertains to any polyester used in the manufacture of bottles or containers which in turn are used to store consume r materials, especially food, pharmaceuticals, beverages and most especially water. |
