Water and oil repellent having excellent desoiling properties

A water and oil repellant having excellent desoiling properties composed of a compound comprising at least two terminal segments and an intermediate segment connecting the terminal segments and having a molecular weight of from 800 to 20,000, each terminal segment containing at least one polyfluoroalkyl group connected by a --CONH-- linking group, said intermediate segment being a urethane oligomer containing at least two --CONH-- linking groups and a hydrophilic molecular chain, and said terminal segments and intermediate segment being connected by an additional --CONH-- linking group, wherein the compound having a molecular weight of from 800 to 20,000 is a compound having the formula:

• ##STR31## wherein R.sub.f is a perfluoroalkyl group of the formula C.sub.n F.sub.2n+1, X is --R--, CON(R.sup.1)--Q-- or --SO.sub.2 N(R.sup.1)--Q--, each of A, A.sup.1 and A.sup.2 is --O--, --S-- or --N(R.sup.2), Z is a monovalent organic group, a is an integer of from 1 to 5, b is an integer of from 0 to 4, a+b is an integer of from 1 to 5, W is a t-valent organic residue obtained by removing the t --NCO groups from a t-functional isocyanate compound having t --NCO groups, wherein t is an integer of a+b+1, B is a bivalent organic residue obtained by removing the two --A.sup.2 --H groups from a hydrophilic molecular chain-containing bifunctional polyvalent active hydrogen compound, provided B may have another organic group bonded by A.sup.2, Y is a bivalent organic residue obtained by removing the two --NCO groups from a bifunctional isocyanate compound, provided Y may have another organic group bonded by a --NHCO-- group, m is an integer of from 1 to 50, r is a bivalent alkylene group, R.sup.1 is hydrogen atom or a lower alkyl group, Q is a bivalent alkylene group, R.sup.2 is a hydrogen atom or a monovalent organic group, or Z and R.sup.2 may form a ring.