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1. (WO2017155888) ADDITIVE INJECTION SYSTEMS AND METHODS

Pub. No.:    WO/2017/155888    International Application No.:    PCT/US2017/020964
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Tue Mar 07 00:59:59 CET 2017
IPC: C08G 69/28
C08G 69/40
Applicants: INVISTA TEXTILES (U.K.) LIMITED
INVISTA NORTH AMERICA S.A R.L.
Inventors: MONSTER, Leen
Title: ADDITIVE INJECTION SYSTEMS AND METHODS
Abstract:
Disclosed is a process and system for suppressing foam formation in the production of polyamide polymers. Starting materials include polymerizable polyamide compositions that are otherwise observed to promote undesirable foam formation, including in the presence of commercial anti-foam additives. By selectively injecting the foam-promoting additive in accordance with the disclosed process, foam generation is decreased compared to the same process with the foam-promoting additive injected at the beginning of the process. Anti-foam additives can likewise be added during the process, including during the polymerization process.