Hydrophobic coating compositions and articles coated with said compositions
Hydrophobic coating compositions are provided as are processes to coat articles with the compositions. Extremely hydrophobic coatings are provided by the compositions. Durable, weatherable and scratch-resistant coatings are provided by compositions comprising a trifluoromethyl-containing component and a hardenable material. Weatherable coatings are also provided by compositions comprising a mobile non-volatile fluorinated component and a hardenable material. Processes are also provided for forming hydrophobic coatings on articles.
1. A composition of matter comprising:
a first perfluoroalkyl monomer, in an amount sufficient to form a surface having at least 15 percent trifluoromethyl groups, comprising
a trifluoromethyl group, and
a carbon chain having a chain length of from 3 to 20 atoms;
a first functionalized monomer comprising a functional group comprising a radiation inducible group that is capable of activation by a second reaction mechanism that differs from a first reaction mechanism; and
a fluorinated solvent;
wherein the first perfluoroalkyl monomer and the first functionalized monomer are capable of being polymerized together by the first reaction mechanism.
2. A composition as in claim 1 , wherein the second reaction mechanism comprises activation by visible light.
3. A composition as in claim 1 , wherein the second reaction mechanism comprises activation by ultraviolet light.
4. A composition as in claim 1 , wherein said functional group is at least one of an epoxy group, a vinyl group, an acrylate group, and a methacrylate group.
5. A composition as in claim 1 , further comprising a catalyst for said second reaction mechanism.
6. A composition as in claim 1 , wherein the first perfluoroalkyl monomer is capable of forming at least one of a peroxide catalyzed linkage, an azo catalyzed linkage, a free radical induced linkage, a cationically induced linkage, a radiation induced linkage, a vinyl linkage, a methacrylate linkage, a urethane linkage, an epoxy linkage, a condensation linkage, a silane linkage, and a siloxane linkage.
7. A composition as in claim 1 , wherein said first functionalized monomer comprises an epoxy group.
8. The composition of claim 1 , further comprising hydrophobic particles having an average particle diameter of less than about 100 microns.
9. The composition of claim 1 , consisting essentially of the first perfluoroalkyl monomer, the first functionalized monomer, and the fluorinated solvent.
10. The composition of claim 1 , wherein the first perfluoroalkyl monomer comprises an unbranched perfluoroalkyl ethylenically unsaturated monomer.
11. The composition of claim 1 , wherein the first perfluoroalkyl monomer comprises an unbranched perfluorooctyl ethylenically unsaturated monomer.
12. A composition as in claim 1 , further comprising at least one catalyst, at least one additive, at least one additional fluorinated monomer, at least one additional functionalized monomer, or any combination thereof.