Repellent fluorochemical compositions
First Claim
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1. A urethane composition consisting essentially of the reaction product of:
- a. An aliphatic polyisocyanate having three or more isocyanate groups; and
b. A fluorochemical of the formula Rf—
SO2N(R1)—
R2-Z;
wherein Rf a perfluoroalkyl or perfluoroheteroalkyl group having from 3 to about 6 carbon atoms,R1 is a lower alkyl group,R2 is an alkylene or heteroalkylene group, andZ is an isocyanate-reactive functional group, andc. an aliphatic monofunctional compound, wherein said fluorochemical is in an amount sufficient to react with at least about 50% of the available isocyanate groups.
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Abstract
This invention provides compositions and methods for treating fibrous substrates to render those substrates durably repellent to water and oil and durably resistant to dry soil comprising a fluorochemical urethane formed by reacting a tri- or higher order isocyanate with a fluorochemical monofunctional compound; and optionally a non-fluorinated aliphatic monofunctional compound.
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Citations
16 Claims
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1. A urethane composition consisting essentially of the reaction product of:
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a. An aliphatic polyisocyanate having three or more isocyanate groups; and b. A fluorochemical of the formula Rf—
SO2N(R1)—
R2-Z;wherein Rf a perfluoroalkyl or perfluoroheteroalkyl group having from 3 to about 6 carbon atoms, R1 is a lower alkyl group, R2 is an alkylene or heteroalkylene group, and Z is an isocyanate-reactive functional group, and c. an aliphatic monofunctional compound, wherein said fluorochemical is in an amount sufficient to react with at least about 50% of the available isocyanate groups. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification