| abstract |
The invention relates to conversion products of lactam-blocked diisocyanates characterized by the general formula:n where nA represents an oxygen atom or an -NH-group, nR represents an alkyl, aralkyl, alkaryl or aryl group, where alkyl and alkyl bound in aralkyl or alkaryl may also be cycloalkyl, nP represents a residue of a polymer P(AH) x with a number-average molecular weight of at least 5000 with one or more OH or NH₂ groups, which polymer has been chosen from the group consisting of polyphenylene oxides, phenoxy resins, polyesters and polycarbonates with terminal OH groups and polymers containing one or more OH or NH₂ groups exclusivly as a result of modification, n(-L-) represents an opened lactam ring, n(-L) represents an unopened lactam ring, nx is an integer higher than or equal to 1, ny is equal to 0 or 1. n The invention further relates to conversion products of lactam-blocked diisocyanates, to polylactam block copolymers derived therefrom by lactam polymerization on a lactam group and to the use of such block copolymers as compatibilizers for polyamide mixtures. |