Protective films and coatings
AssigneeMinnesota Mining and Manufacturing Company
InventorDenise A. Barrera
Life of this patent
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Abstract
A multi-layered film disposed on a substrate, the multi-layered film comprising: (a) an interpenetrating polymer network (IPN) layer; and (b) at least one fluoro-containing polymer layer; wherein the fluoro-containing polymer layer comprises a perfluoro-acrylate homo-or copolymer, or a perfluoro-vinyl non-acrylate homo-or copolymer. The substrate can be a cured adhesive, preferably a cured pressure-sensitive adhesive (PSA), in which case the fluoro-containing polymer layer is typically situated between the PSA layer and the IPN layer. Alternatively, the substrate can be a surface to be protected from exposure to weather, chemical exposure, graffiti, or the like, such as, for example, a vehicle such as an automobile, a truck, a boat, or an aircraft; an outdoor sign; or a building exterior.
Claims21
A multi-layered film comprising:
- a. an interpenetrating polymer network layer, and
- b. at least one fluoro-containing polymer layer, wherein the film is disposed on a substrate.
A method for preparing a protective film comprising the steps of:
- a. coating or otherwise depositing a layer comprising curable interpenetrating polymer network film precursors onto a substrate;
- b. coating or otherwise depositing a fluoro-containing topcoat layer onto the curable interpenetrating polymer network film precursors, wherein the fluoro-containing topcoat layer is selected from the group consisting of a cured fluoropolymer and an energy-curable fluoropolymer precursor;
- and
- c. applying at least one of heat or light energy to the coatings to cure the curable interpenetrating polymer network film precursors and the energy-curable fluoropolymer precursor.
Dependencies are inferred from the claim text.