High molecular weight poly-(toluenediamine aramides) and a method for their preparation
申请人:AIR PRODUCTS AND CHEMICALS, INC.
公开号:EP0348825A2
公开(公告)日:1990-01-03
This invention relates to high molecular weight toluenediamine - containing polyamide resins formed by the reaction of a mixture of 2,4-toluenediamine and 2,6-toluenediamine and derivatives thereof with an aromatic diacid or precurser thereof. The resulting polyamides are amorphous, as opposed to crystalline. Because they are amorphous, they lend themselves to a wide variety of processing techniques and because of their high molecular weight, they have outstanding physical properties.
The polyamides are prepared using a precondensate method wherein a mixture of the toluenediamine isomers and aromatic acid, usually in the form of the aromatic acid dihalide, is reacted at relatively low temperatures forming a precondensate and the precondensate subsequently polymerized in the presence of an acid acceptor.
本发明涉及由 2,4-甲苯二胺和 2,6-甲苯二胺及其衍生物的混合物与芳香族二酸或其前体反应而形成的含高分子量甲苯二胺的聚酰胺树脂。生成的聚酰胺是无定形的,而不是结晶的。由于它们是无定形的,因此可以采用多种加工技术,而且由于它们的分子量高,因此具有出色的物理特性。
聚酰胺采用预缩合法制备,其中甲苯二胺异构体和芳香族酸(通常以芳香族酸二卤化物的形式)的混合物在相对较低的温度下反应形成预缩合物,预缩合物随后在酸接受体存在下聚合。