Composition based on aliphatic polycarbonates which contain urethan groups and acrylic or metacrylic end groups, to be cross-linked in the presence of radicalic initiators

A composition based on aliphatic polycarbonates containing urethane groups and acrylic or methacrylic end groups, capable of being cross-linked in the presence of radicalic initiators for the functionalization with acrylic or methacrylic groups of a mixture composed of diols and their OH-terminated oligomeric derivatives or polyols and their OH-terminated oligomeric derivatives containing in their molecules carbonate groups and urethane groups which composition is prepared by a process comprising the steps of reacting the mixture of diols or and their oligomeric OH-terminated derivatives which contain carbonate groups or polyols and their oligomeric OH-terminated derivatives with contain carbonate groups, in an initial stage with a primary diamine having the general formula:

• H.sub.2 N--R--NH.sub.2 wherein the R is an alkylene radical, a straight or branched chain aliphatic, cycloaliphatic or aryl-alkyl radical, having from 2-16 carbon atoms and thereafter functionalizing the OH groups in said mixture with the acrylic or the methacrylic group by reaction with an acrylic or methacrylic acid, ester or acid chloride.