Novel polyureas prepared by reaction of a diamine with a diisocyanate or a diisothiocyanate

Claim 1

Polyureas containing repeating groups of the formula ##STR15## X is absent or represents an oxygen or sulphur atom or a group of the formula =N-R in which R represents an aliphatic, cycloaliphatic or aromatic group or a heterocyclic group; X' represents an oxygen or sulphur atom; Y represents an aliphatic, cycloaliphatic or aromatic hydrocarbon group or heterocyclic group; a group of the formula -NR 2 wherein R has the meaning given above or wherein the two groups R and the nitrogen atom to which they are attached together represent a N-containing heterocyclic ring; a group of the formula --OR in which R has the meaning given above; or a group of the formula ##STR16## R 1 , R 2 , R 3 and R 4 each represent a substituent on the piperazine ring said substituents R 1 , R 2 and R 3 containing no active hydrogen atoms reactive with isocyanate or isothiocyanate groups, and substituent R 4 being hydrogen or a substituted or unsubstituted aliphatic, cycloaliphatic or aromatic hydrocarbon group, a heterocyclic group, an acyl group, a sulphonyl group, or a substituted carbamoyl group, --CO--NHR, wherein R has the meaning give above, n 1 , n 2 and n 3 , which may be the same or different each represents O or an integer; and Z represents the residue obtained by removal of the NCO or NCS groups from an organic diisocyanate or diisothiocyanate.