Liquid-phase process for preparing high molecular weight polyamides
Номер патента: CA1091845A
Опубликовано: 16-12-1980
Автор(ы): Jerome W. Sprauer
Принадлежит: EI Du Pont de Nemours and Co
Опубликовано: 16-12-1980
Автор(ы): Jerome W. Sprauer
Принадлежит: EI Du Pont de Nemours and Co
Реферат: A process for making a high molecular weight polyamide, wherein a diacid-rich component and a diamine-rich component are prepared separately in nonstoichio-metric proportions, each of these components melting below the melting temperature of the polyamide product, and preferably below 200°C; and then the diacid-rich component and the diamine-rich component are contacted in liquid state at high enough temperature to prevent solidification, and in proportions such that the total amounts of diacid and diamine, whether combined or not, are as much as possible stoichiometric. A major utility of this process is in the production of Nylon 66, a known fiber-forming polyamide and engineering plastic.
Solid-state post-condensation process for increasing the molecular weight of a polyamide
Номер патента: US20050119444A1. Автор: Rudy Rulkens,Robert Crombach. Владелец: DSM IP ASSETS BV. Дата публикации: 2005-06-02.