F DI-CARBOXY TERMINATED OLIGOMERS TO BISOXAZINES OPOLYMERS AND COPOLYMERS PREPARED BY THE ADDITION OR BISOXAZOLINES

摘要

Polymers and copolymers containing at least one repeat unit of formula: in which: - R is a single bond or a hydrocarbon chain, - R' is a hydrocarbon chain containing two or three carbon atoms, - P is the residue of an oligomer whose solution viscosity, determined in meta-cresol at 30 DEG C and at a concentration of 0.5 g/dl, is lower than 0.50 dl g<-1>. Process for obtaining these polymers and copolymers.