MODIFICATION OF POLYAMIDE 6 WITH HYCAR ATBN

The preparation of block copolymers from 6‐caprolactam and a liquid amine terminated butadiene‐acrylonitrile copolymer Hycar ATBN 1300X21 having higher notched impact strength than ordinary poly(6‐caprolactam) was studied. In the polymerization of 6‐caprolactam initiated by an adduct of phosphoric acid with 6‐caprolactam the influence of initiator concentration (0– 50 mol‐%) and Hycar ATBN 1300X21 concentration (0–5 wt.‐%) in the polymerization charge, of polymerization time (4 – 72 h) and of temperature (200–280°C) on the 6‐caprolactam conversion and on the properties of the copolymers formed were followed. Notched impact strength of the block copolymers prepared under optimized conditions was as high as 13.5 kJ·m−2. © 1990 Hüthig & Wepf Verlag, Basel