| 摘要 |
<p>New process for preparing polyesters containing an oxysulphonyl group. More precisely, a process for the preparation of a copolyester containing oxysulphonyl groups, comprising a plurality of repeat units derived from at least one aliphatic diacid, at least one aromatic diacid containing an oxysulphonyl group, optionally at least one aromatic diacid, and at least one diol, characterised in that the polycondensation of lower alkyl diesters of the above diacids and of the diol is carried out in the presence of a catalyst system comprising at least one titanium compound and at least one manganese carboxylate. The copolyesters thus prepared can be employed for oriented composite polyester films for some applications to which simple oriented polyester films are unsuited.</p> |
