Fluorochemical composition containing a condensation product of a fluorochemical polyether and a poly-isocyanate to impart stain release properties to a substrate
Assignee3M Innovative Properties Company
InventorsKathy E. M. L. A. Allewaert, Pierre J. Vander Elst, Rudolf J. Dams
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Abstract
The invention provides a method of treating of a substrate by contacting the substrate with a fluorochemical composition that comprises a condensation product of a di- or tri-isocyanate and at least one polyether, the polyether being obtained as the reaction product of a fluorochemical substituted epoxide. Substrates treated in accordance with the invention have good stain release properties, particularly to oil stains or tea stains, so stains can be more easily removed from the treated substrate in a laundering procedure.
Claims26
A method of treatment of a fibrous substrate comprising the step of contacting said substrate with a fluorochemical composition comprising a condensation product of a di- or tri-isocyanate and at least one polyether provided by reacting a fluorochemical substituted epoxide of formula (I) with a compound of formula (III) or (III):
- HX1—B—X2H (II)
- (Rf′)k—L2—X2H (III)
- wherein
- B represents the organic residue obtained by removing the groups HX1 and HX2 from the compound of formula (II);
- X1 and X2 each independently represents O, NH and S;
- L1 represents an organic divalent linking group;
- L2 represents an organic linking group having a valency of k+1;
- k represents an integer of 1 to 10;
- Rf and Rf′ independently represent a fully or partially fluorinated aliphatic;
- and
- s and a are each 1.
A fluorochemical composition comprising a condensation product of a di- or tri-isocyanate, and at least one polyether provided by reacting a fluorochemical substituted epoxide of formula (I) with a compound of formula (II) or (III):
- HX1—B—X2H (II)
- (Rf′)k—L2—X2H (III)
- wherein:
- B represents the organic residue obtained by removing the groups HX1 and HX2 from the compound in formula (II);
- X1 and X2 each independently represent O, NH and S;
- L1 represents an organic divalent linking group;
- L2 represents an organic linking group having a valency of k+1;
- k represents an integer of 1 to 10;
- Rf and Rf′ independently represent a fully- or partially-fluorinated aliphatic group;
- s and a are independently 0 or 1;
- and
- a chain terminator selected from the group consisting of an alcohol, a thiol and an amine.
Dependencies are inferred from the claim text.