Fluoropolymer compositions and treated substrates

A method of providing water repellency, alcohol repellency, and oil repellency, stain release, hydrophilicity stain release, and cleanability to substrates comprising contacting said substrate with a polymer having at least one urea linkage prepared by:

• (i) reacting (a) at least one diisocyanate, polyisocyanate, or mixture thereof, having isocyanate groups, and (b) at least one fluorinated compound selected from the formula (I):
• Rf(CH2CF2)p(CH2CH2)q(R1)r—XH
• wherein
• p and q are each independently an integer of 1 to 3;
• r is 0 or 1;
• X is —O—, —NH— or —S—;
• R1 is a divalent radical selected from the group consisting of —S(CH2)n—,
• n is an integer of 2 to 4;
• s is an integer of 1 to 50;
• R2, R3, and R4 are each independently hydrogen or an alkyl group containing 1 to 6 carbon atoms;
• and
• Rf is a linear or branched chain perfluoroalkyl group having 1 to 6 carbon atoms;
• and
• (ii) reacting with (c) water, a linking agent, or a mixture thereof.

A method of providing soil resistance to substrates comprising contacting said substrate with a polymer having at least one urea linkage prepared by:

• (i) reacting (a) at least one diisocyanate, polyisocyanate, or mixture thereof, having isocyanate groups, and (b) at least one fluorinated compound selected from the formula (I):
• Rf(CH2CF2)p(CH2CH2)q(R1)r—XH Formula (I)
• wherein
• p and q are each independently an integer of 1 to 3;
• r is 0 or 1;
• X is —O—, —NH—, or —S—;
• R1 is a divalent radical selected from the group consisting of —S(CH2)n—,
• n is an integer of 2 to 4;
• s is an integer of 1 to 50;
• R2, R3 and R4 are each independently hydrogen or an alkyl group containing 1 to 6 carbon atoms;
• and
• Rf is a linear or branched chain perfluoroalkyl group having 1 or 6 carbon atoms;
• and then
• (ii) reacting with (c) water, a linking agent, or a mixture thereof;
• with the proviso that when Rf has 1 to 4 carbon atoms, said at least one organic diisocyanate, polyisocyanate, or mixture thereof, comprises one or more cyclic diisocyanate(s) selected from the group consisting of 2,4-toluene diisocyanate;
• 2,6-toluene diisocyanate;
• diphenylmethane 4,4′-diisocyanate;
• diphenylmethane 2,4′-diisocyanate;
• 3-isocyanatomethyl-3,4,4-trimethylcyclohexyl isocyanate;
• bis-(4-isocyanatocylohexyl)methane;
• and diisocyanate trimers of formula (IIa), (IIb), (IIc), and (IId):