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US 2012/0058260 A1Published application
Slot die coating process
AssigneeDsm IP Assets B.V.
InventorsNanning Joerg Arsten, Pascal Josef Paul Buskens, Marnix Rooijmans
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AssigneeDsm IP Assets B.V.
InventorsNanning Joerg Arsten, Pascal Josef Paul Buskens, Marnix Rooijmans
Estimating the term…
The present invention relates to a process for applying an optical coating to a substrate comprising the steps of (a) preparing an optical coating formulation comprising a solvent component and a film forming component; (b) using a die coater to form a coated substrate by applying the optical coating to a substrate, where the applied optical coating forms a wet film thereon having a thickness from 8 μm to 100 μm; (c) drying the coated substrate, where the coated substrate is in a substantially horizontal plane thereby converting the wet film to a dry film having a thickness of less than 1 μm. The optical coating formulation comprises greater than 0.3 wt % to no more than 10 wt % solids relative to the total weight of the optical coating formulation. The coated substrate may be optionally cured.
A process for applying an optical coating to a substrate comprising the steps of:
The process according to anyone of the preceding claims, wherein the surface tension of the coating formulation is in the range of 20 to 73 dyn·cm−1.
The process according to anyone of the preceding claims, wherein the solvent component comprises a solvent selected from the group consisting of methanol, ethanol, methyl ethyl ketone, acetone, 1-propanol, 2-propanol or 1-methoxypropan-2-ol, 1-butanol, 2-butanol, 2-methyl-2-propanol or combinations thereof.
The process according to anyone of the preceding claims, wherein the film forming component comprises at least one oligomeric or polymeric compound.
The process according to anyone of the preceding claims, wherein the slot die comprises a slot gap (3) defined up an upstream lip (7b) positioned upstream from the flow of the optical coating and a downstream lip (7a) positioned downstream from the flow of the optical coating, wherein
The process according to any one of the preceding claims the slot die comprises a slot die gap of at least 1.5 times the thickness of the wet film in combination with a reduced pressure means for stabilization of the upstream bead meniscus of the applied optical coating.
The process according to any one of the preceding claims, wherein the substrate is coated at a coating speed of at least 5 meters per minute and less than 100 meters per minute.
An optical coated substrate, wherein the substrate is coated with a coating comprising nano-particles and a binder, on at least one side over a surface area of at least 0.01 m2, wherein the coating has a thickness of no more than 1000 nm and a thickness variation, as indicated by 2×standard deviation, of less than 40 nm across the surface area of the substrate.
Dependencies are inferred from the claim text.