Modified fluorocarbonylimino biurets

A fluorocarbonylimino biuret of the formula:

• ##STR16## wherein Z is a tris-(carbonylimino)biuret radical of the general formula ##STR17## in which R is an aliphatic or cycloaliphatic residue of 4 to 20 carbon atoms, optionally substituted with alkyl or alkoxy substituents;
• R.sub.f is a fully-fluorinated straight or branched aliphatic radical of 3 to 20 carbon atoms which can be interrupted by oxygen atoms;
• A is a divalent radical consisting of --SO.sub.2 NR.sub.3 13 , --CONR.sub.3, --S--, or --SO.sub.2 --, wherein R.sub.3 is H or alkyl or 1 to 6 carbon atoms;
• B is a divalent linear hydrocarbon radical --C.sub.n H.sub.2n -- which can be end-capped by ##STR18## wherein n is 0 to 12, z is 1 to 50, and R.sub.4 is H or lower alkyl;
• X is O, S or NR.sub.5, wherein R.sub.5 is H or lower alkyl;
• R' is a monovalent fluorine-free alicyclic, aromatic or heterocyclic radical substituted with one or more of the following:
• --Cl, --Br, OR.sub.6, CO.sub.2 R.sub.6, --Si(OR.sub.6).sub.3, --N.sup..sym. (R.sub.6).sub.3 or vicinal --OH/--Cl or --OH/--Br, wherein R.sub.6 is alkyl 1 to 18 carbon atoms,
• R" is any substituted or unsubstituted fluorine containing fluorine-free aliphatic, alicyclic, aromatic or heterocyclic radical with a valency of at least 2 and not more than 100;
• m is zero or 1;
• p is 1 or 2;
• q is (3-p), i.e., either 2 or 1;
• r is 1 or 2;
• s is (2-r);
• and
• t is an integer of 2 to 100.