Process for polymerizing lactam

摘要

The present invention relates to a novel process for the anionic polymerization of lactam monomers.

主权项

1. A process for producing polyamide particles, the process comprising:
anionically polymerizing a lactam in the presence of a catalyst and an activator by introducing discrete droplets of a reaction mixture comprising the lactam, the catalyst, and the activator into a surrounding gas phase within a reactor, and reacting said reaction mixture to form polyamide particles, wherein the introducing and mixing of the lactam, the catalyst, and the activator occurs continuously, such that:
the activator is first continuously admixed with a lactam stream to form an activator mixture, the catalyst is then continuously incorporated into the activated mixture by mixing to form the reactive mixture, and the reactive mixture is then continuously sprayed into the reactor; orthe catalyst is first continuously admixed with a lactam stream to form a catalyst mixture, the activator is then continuously incorporated into the catalyst mixture by mixing to form the reactive mixture, and the reactive mixture is then continuously sprayed into the reactor, and wherein the introducing of the lactam, the catalyst, and the activator into the reactor is carried out by spraying the mixture of the lactam, the catalyst, and the activator through spray nozzles at a rate of from 0.1 to 10 m3/h, and wherein at least 90% of the total amount of reactive lactam monomer reacts to form the polyamide particles by the end of said anionically polymerizing.