Soil and stain resistant coating composition for finished leather substrates
A coated leather substrate having at least one surface that comprises at least one first layer above that surface and at least one second layer above that first layer and, the first layer comprises at least one polymer and wherein the second layer being different in its chemical composition from the first layer comprises the reaction product of a cross-linking reaction of at least one first composition said first composition comprising one or more compounds having at least one fluoropolyether segment and at least two cross-linkable groups and said second composition comprising at least one fluorinated polyolefin. Furthermore are provided a coating composition, methods of coating leather substrates and use of the coating compositions.
1. A coated leather substrate having at least one surface that comprises at least one first layer above that surface and at least one second layer above that first layer and, the first layer comprises at least one polymer and wherein the second layer being different in its chemical composition from the first layer comprises the reaction product of a cross-linking reaction of at least one first composition said first composition comprising one or more compounds having at least one fluoropolyether segment and at least two cross-linkable groups and said second composition comprising at least one fluorinated polyolefin;
wherein the one or more compounds having two or more cross-linkable groups and at least one fluoropolyether segment of the first composition are a reaction product of components comprising:
a. a polyisocyanate;
b. a fluorinated compound having at least one fluoropolyether segment and having at least one isocyanate-reactive group; and
c. a compound having one or more ethylenically unsaturated groups and having at least one isocyanate-reactive group.
2. The leather substrate according to claim 1 wherein said fluoropolyether segment comprises repeating units selected from —C p F 2p O—, —CFZO—, —CFZC p F 2p O—, —C p F 2p CFZO—, and mixtures thereof, wherein p is an integer of 1 to 4 and Z is F or a perfluoroalkyl group of 1 to 4 carbon atoms.
3. The leather substrate according to claim 1 wherein said cross-linkable groups are cross-linkable by electron beam irradiation, cross-linkable by thermal treatment, cross-linkable by UV irradiation or a combination thereof.
4. The leather substrate according to claim 1 wherein said cross-linkable groups are ethylenically unsaturated groups.
5. The leather substrate according to claim 1 wherein said cross-linkable groups are selected from acrylates and/or methacrylates.
6. The leather substrate according to claim 1 , wherein the fluorinated polyolefin comprises one or more units derived from tetrafluoroethylene (TFE), hexafluoropropylene (HFP), vinylidene fluoride (VDF), chlorotrifluoroethylene (CTFE), perfluoroalkylvinyl ether, perfluoroalkylallyl ether and combinations thereof.
7. The leather substrate according to claim 1 wherein the cross-linking reaction of the first composition is carried out in the presence of the second composition.
8. The leather substrate according to claim 1 wherein the leather substrate is selected from a piece of furniture, a piece of an interior equipment of a car, a component of a garment, a component of a shoe, a component of a seat, a component of a stirring wheel, a component of a belt, a component of a handbag or a component of a glove.