An aqueous emulsion contains a copolymer having three components: a) to c). Component a) has at least one biuret or isocyanurate substructure. Component b) is selected from polysiloxanes and polyhydrocarbons, preferably polysiloxanes. Component c) contains a hydrocarbon which is different from component b) and has at least 6 carbon atoms and not more than 3 heteroatoms selected from N, O, and S. Component b) is joined to 2 different or identical components a) via at least two positions.

An aqueous emulsion contains a copolymer having three components: a) to c). Component a) has at least one biuret or isocyanurate substructure. Component b) is selected from polysiloxanes and polyhydrocarbons, preferably polysiloxanes. Component c) contains a hydrocarbon which is different from component b) and has at least 6 carbon atoms and not more than 3 heteroatoms selected from N, O, and S. Component b) is joined to 2 different or identical components a) via at least two positions.

A method of preparing a water-repellent and moisture-permeable fabric, includes: preparing a water-repellent fabric by: immersing a raw fabric in a non-fluorinated water-repellent emulsion containing a non-fluorinated water repellent and an aqueous blocked polyisocyanate crosslinking agent; and drying and curing the raw fabric, which has been immersed, at a temperature of 150° C. to 200° C.; applying a polyurethane-based moisture-permeable coating liquid to the water-repellent fabric; and drying the water-repellent fabric while increasing a temperature from 100° C. to 150° C.

A method of preparing a water-repellent and moisture-permeable fabric, includes: preparing a water-repellent fabric by: immersing a raw fabric in a non-fluorinated water-repellent emulsion containing a non-fluorinated water repellent and an aqueous blocked polyisocyanate crosslinking agent; and drying and curing the raw fabric, which has been immersed, at a temperature of 150° C. to 200° C.; applying a polyurethane-based moisture-permeable coating liquid to the water-repellent fabric; and drying the water-repellent fabric while increasing a temperature from 100° C. to 150° C.

A blocked polyisocyanate-containing curable silicone composition includes an amino group-containing organopolysiloxane, a blocked polyisocyanate and a catalyst which is an organic base compound and/or a metal compound. The composition has a high curability even under low-temperature conditions and, when used as a textile treatment, imparts textile fibers and products with good softness and water absorbency, and also has an excellent durability to washing.

A blocked polyisocyanate-containing curable silicone composition includes an amino group-containing organopolysiloxane, a blocked polyisocyanate and a catalyst which is an organic base compound and/or a metal compound. The composition has a high curability even under low-temperature conditions and, when used as a textile treatment, imparts textile fibers and products with good softness and water absorbency, and also has an excellent durability to washing.

A fluorine-free composition includes at least one polycarbodiimide compound derived from a carbodiimidization reaction of a carbodiimidization reaction mixture comprising at least one oligomer, wherein the oligomer comprises at least one isocyanate end group and at least two repeating units, wherein each of the at least two repeating units comprises at least one hydrocarbon group having at least 16 carbon atoms. The composition may also include at least one paraffin wax. Such compositions are useful for treating fibrous substrates to enhance their water-repellency.

A fluorine-free composition includes at least one polycarbodiimide compound derived from a carbodiimidization reaction of a carbodiimidization reaction mixture comprising at least one oligomer, wherein the oligomer comprises at least one isocyanate end group and at least two repeating units, wherein each of the at least two repeating units comprises at least one hydrocarbon group having at least 16 carbon atoms. The composition may also include at least one paraffin wax. Such compositions are useful for treating fibrous substrates to enhance their water-repellency.

A fluorine-free composition includes at least one polycarbodiimide compound derived from a carbodiimidization reaction of a carbodiimidization reaction mixture comprising at least one oligomer, wherein the oligomer comprises at least one isocyanate end group and at least two repeating units, wherein each of the at least two repeating units comprises at least one hydrocarbon group having at least 16 carbon atoms. The composition may also include at least one paraffin wax. Such compositions are useful for treating fibrous substrates to enhance their water-repellency.

A fluorine-free composition includes at least one polycarbodiimide compound derived from a carbodiimidization reaction of a carbodiimidization reaction mixture comprising at least one oligomer, wherein the oligomer comprises at least one isocyanate end group and at least two repeating units, wherein each of the at least two repeating units comprises at least one hydrocarbon group having at least 16 carbon atoms. The composition may also include at least one paraffin wax. Such compositions are useful for treating fibrous substrates to enhance their water-repellency.