申请人:POLYPLASTICS CO. LTD.
公开号:EP0517511A2
公开(公告)日:1992-12-09
The present invention provides a process for the preparation of a polyester which has a high rate of crystallisation and is excellent not only in the processability in moulding but also in heat resistance and mechanical strengths.
In the preparation of an aromatic polyester by the reaction of a lower alkyl ester of an aromatic dicarboxylic acid with an aliphatic diol, the transesterification of the lower alkyl ester with the diol is conducted in the presence of 0.02 to 5.0 mole %, based on the lower alkyl ester of an aromatic dicarboxylic acid, of an aromatic sulfonic acid compound represented by the following general formula (I) by the use of a titanium compound as a catalyst, followed by the polycondensation of the transesterification product:
HO-R-O-Ar-SO₃M (I)
wherein -Ar- is a group selected between p-substituted benzene and 2,6-substituted naphthalene groups;
R is a divalent group selected from among -CH₂CH₂-, -CH(CH₃)CH₂-, -CH₂CH(CH₃)- and -CH₂CH₂OCH₂CH₂-;
and M is an alkali metal selected from among lithium, sodium and potassium.
An excellent composition comprising this polyester and other aromatic polyester can be obtained.
本发明提供了一种制备聚酯的工艺,这种聚酯具有很高的结晶率,不仅在模塑加工性方面,而且在耐热性和机械强度方面都非常出色。
在通过芳香族二羧酸的低级烷基酯与脂肪族二元醇反应制备芳香族聚酯时,以芳香族二羧酸的低级烷基酯为基准,在 0.02 至 5.0 摩尔%的芳香族磺酸化合物存在下,使用钛化合物作为催化剂,进行低级烷基酯与二元醇的酯交换反应,然后对酯交换反应产物进行缩聚反应:
HO-R-O-Ar-SO₃M (I)
其中 -Ar- 是选自对取代苯和 2,6-取代萘的基团;
R 是选自 -CH₂CH₂-、-CH(CH₃)CH₂-、-CH₂CH(CH₃)- 和 -CH₂CH₂OCH₂CH₂- 的二价基团;
和 M 是选自锂、钠和钾的碱金属。
由这种聚酯和其他芳香族聚酯组成的组合物效果极佳。