申请人:TEIJIN LIMITED
公开号:EP0057387A2
公开(公告)日:1982-08-11
A process for producing a film-like or fibrous structure of an aromatic polyester, which comprises
(1) forming an unstretched film-like or fibrous structure by melt-shaping a blend comprising 100 parts by weight of (A) an aromatic polyester having a high degree of polymerization derived from an aromatic dicarboxylic acid as a main acid component and an aliphatic diol and/or an alicyclic diol as a main glycol component and (B) 3 to 300 parts by weight of a low-molecular-weight compound being substantially non-reactive with the aromatic polyester (A) and having a boiling point of at least about 200°C under atmospheric pressure and a molecular weight of not more than 1,000,
(2) stretching the resulting film-like or fibrous structure,
(3) extracting at least a major portion of the low-molecular-weight compound from the stretched film-like or fibrous structure by using an organic solvent which does not substantially dissolve the aromatic polyester under the extracting conditions, and
(4) if desired, heat-setting the film-like or fibrous structure after the stretching step (2) and/or the extracting step (3).
The film-like or fibrous structure of an aromatic polyester prepared by the process substantially contains no low-molecular-weight compound or contains the low-molecular-weight compound in an amount of up to about 1 part by weight at most per 100 parts by weight of the aromatic polyester.
一种生产芳香族聚酯膜状或纤维状结构的工艺,包括
(1) 通过熔融定型混合料形成一种未拉伸的膜状或纤维状结构,该混合料包括:(A) 以芳香族二羧酸为主要酸组分,以脂肪族二元醇和/或脂环族二元醇为主要二元醇组分的具有高聚合度的芳香族聚酯;(B) 3 至 300 份(重量)与芳香族聚酯(A)基本不反应且沸点至少约为 200℃的低分子量化合物;(C) 100 份(重量)与芳香族聚酯(A)具有高聚合度的芳香族聚酯。(B) 3 至 300 重量份的低分子量化合物,该化合物基本上不与芳香族聚酯 (A) 反应,在常压下的沸点至少约为 200°C,分子量不超过 1、000,
(2) 拉伸得到的薄膜状或纤维状结构、
(3) 使用在萃取条件下基本上不溶解芳香族聚酯的有机溶剂,从拉伸的膜状或纤维状结构中萃取至少大部分低分子量化合物,以及
(4) 如果需要,在拉伸步骤 (2) 和/或萃取步骤 (3) 之后对薄膜状或纤维状结构进行热固。
通过该工艺制备的芳香族聚酯的膜状或纤维状结构基本上不含低分子量化合物,或含低分子量化合物的量最多为每 100 份芳香族聚酯中约 1 份(重量)。