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AssigneeE.I. du Pont de Nemours and Company
InventorCraig King Hennessey
Estimating the term…
A process for forming a release surface on a substrate includes applying a primer powder on the substrate to form a primer layer, applying an overcoat powder on the primer layer to form an overcoat layer, and baking the substrate after applying both the primer powder and the overcoat powder. The primer powder includes a tetrafluoroethylene/perfluoroolefin copolymer and a non-melt processible binder. The overcoat powder includes a tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer.
A process for forming a release surface on a substrate, the process comprising:
Dependencies are inferred from the claim text.
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From the US filing history. Foreign family members aren’t listed.
To obtain an anti-friction or anti-adhesive surface: involving the use of fluoropolymers
Involving the use of an electrostatic field: applying particulate materials
By baking: after-treatment
Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying…
About 1 year of term left · ends 24 Oct 2027 (estimated)
1. Field of the Disclosure
This invention is in the field of forming a durable release surface by applying a primer powder to a substrate to form a fluoropolymer primer layer thereon, and applying a fluoropolymer powder on the primer layer to form an overcoat. In particular, the invention is directed to the selection of a fluoropolymer primer powder that achieves good intercoat adhesion with a tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer powder overcoat and maintains a long lasting bond with the substrate.
2. Background of the Related Art
In accordance with the present invention, there is provided a process for forming a release surface on a substrate including applying a primer powder on the substrate to form a primer layer, applying an overcoat powder on the primer layer to form an overcoat layer, and baking the substrate after applying both the primer powder and the overcoat powder. The primer powder includes a tetrafluoroethylene/perfluoroolefin copolymer and a non-melt processible binder. The overcoat powder includes a tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer.
In one embodiment, the non-melt processible binder includes polyamideimide, polybenzimidazole, polyimide, a liquid crystal polymer, or any combination thereof. In a specific embodiment, the non-melt processible binder includes polyamideimide.
In still another embodiment, the primer powder includes 35 to 90 weight percent of the tetrafluoroethylene/perfluoroolefin copolymer and 10 to 65 weight percent of the non-melt processible binder, based on a combined weight of the tetrafluoroethylene/perfluoroolefin copolymer and the non-melt processible binder.