申请人:ENIRICERCHE S.p.A.
公开号:EP0347963A2
公开(公告)日:1989-12-27
A thermotropic copolyester, showing a liquid-crystalline structure of nematic type within a desired temperature range, contains umits deriving from:
(a) a saturated bicarboxy aliphatic acid;
(b) 4,4′-di-hydroxy-biphenyl;
(c) 4-hydroxybenzoic acid; and
(d) 4-hydroxy-benzoic acid bearing an alkyl substituent or a halogen atom bonded to the aromatic ring.
Such a copolyester constitutes a material endowed with self-reinforcing characteristics, originating, through the usual transformation processes by injection or by extrusion techniques, marked molecular orientations, which supply the manufactured articles with high stiffness characteristics.
Said material can be also used as a reinforcing agent when is mixed, by means fo the usual techniques, with the traditional thermoplastic polymers.
热致性共聚聚酯在所需的温度范围内显示出向列类型的液晶结构,其中包含的微量元素来自于
(a) 饱和双羧基脂肪族酸;
(b) 4,4′-二羟基联苯;
(c) 4-羟基苯甲酸;和
(d) 4-羟基苯甲酸,其芳香环上键有一个烷基取代基或一个卤素原子。
这种共聚聚酯是一种具有自强化特性的材料,通过注塑或挤压技术的通常转化过程,可产生明显的分子取向,使制成的物品具有高硬度特性。
当这种材料通过常规技术与传统的热塑性聚合物混合时,也可用作增强剂。