Fluorine-free fibrous treating compositions, treated substrates, and treating methods

A method of treating a fibrous substrate in an amount sufficient to make the fibrous substrate water repellent, the method comprising applying to the fibrous substrate a fluorine-free treating composition comprising:

• Component (A) comprising one or more polymeric compounds derived from the polymerization of at least one (meth)acrylate monomer comprising at least one hydrocarbon group having from 1 to 60 carbon atoms and at least one isocyanate-derived group;
• and
• Component (B), wherein:
• Component (B) comprises one or more compounds derived from reaction, in one or more steps, of components comprising:
• (i) at least one isocyanate-reactive oligomer comprising 2 to 20 repeating units, or an alcohol having at least one linear or branched hydrocarbon group having from 16 to 40 carbon atoms and optionally one or more ester groups;
• (ii) at least one polyisocyanate;
• (iii) optionally at least one additional isocyanate-reactive compound;
• and
• (iv) optionally at least one isocyanate blocking agent;
• wherein the isocyanate-reactive oligomer is made by the radical-initiated reaction of at least one (meth)acrylate monomer, in the presence of at least one mercaptan, comprises at least one hydrocarbon group having from 1 to 60 carbon atoms and at least one isocyanate-derived group.