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。