Ceskoslovenska Akademie Ved

Jaroslav Stehlicek

Jan Sebenda

The invention relates to the method for preparation of polymers containing N-acyllactam groups which are suitable as polymeric activators of anionic polymerization of lactams to obtain graft copolymers or block copolymers of the AB or ABA type, where A is the polyamide block. The polymers of the general formula I ##STR1## wherein R.sup.1 is a bifunctional aliphatic C.sub.2 - C.sub.15 hydrocarbon residue, n is an integer and P is a n-functional linear, branched or crosslinked polymeric residue, are prepared by the reaction of polymeric acyl halides of the general formula II ##STR2## where X = Cl or Br, with 1 - 5 mole of trisubstituted N-silyllactam, e.g. N-trimethylsilyllactams or N-phenyldimethylsilyllactams, per one equivalent of acyl halide group in an inert solvent at -15 to +100.degree. C (preferably 0.degree. to +30.degree. C). The polymeric acyl chlorides (the general formula II, X = Cl) are advantageously prepared from polymers containing carboxylic groups and 1 - 5 moles of PCl.sub.5 per one equivalent of carboxylic groups at -15.degree. C to +100.degree. C, preferably at 0.degree. C to +30.degree. C.

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Prague, Czechia

Jaroslav Stehlicek