Patent Application
20090215936
This invention relates generally to the field of protective coatings for various substrates and surfaces, and more particularly relates to such coatings beneficial to organic substrates and surfaces, and in particular wood substrates or surfaces, wherein the coating seals the substrate or surface and prevents decay and decomposition of the substrate or surface.
The protective coating or sealant comprises a fluorophosphate ester, a fluorosurfactant such as a cationic fluoropolymer, polytetrafluoroethelene (PTFE), and deionized water. The coating may further comprise a silane having a solid content within a predetermined range.
The coating is prepared by first mixing water, fluorophosphate ester and the fluorosurfactant with PTFE to create a fluorinated urea poluol. In a second step, the fluorinated urea poluol is converted again into a tetraethylfluoromethylacrylate. In an alternative embodiment, a silane is added to the mixture to extend the effective life of the coating. The coating seals the organic substrate or surface when applied and allowed to dry, thereby repelling water and stains and preventing or inhibiting decay and decomposition of the substrate or surface.
A coating of a first preferred embodiment consisting essentially or comprising a composition having a fluorophosphate ester, a fluorosurfactant such as a cationic fluoropolymer, polytetrafluoroethelene (PTFE), and deionized water. The coating of the first preferred embodiment can also include a silane, such as polytetraethoxysilane having a solid content within a predetermined range, which will enable the coating to last for a great number of years. In one variation of the coating of the preferred embodiment, the coating can include fluorophosphate ester in an amount ranging between approximately five and fifteen percent by weight, the fluorosurfactant in an amount ranging between approximately five and fifteen percent by weight, polytetrafluoroethelene (PTFE) in an amount ranging between trace and approximately fifteen percent by weight, and deionized water in an amount ranging between approximately sixty five and ninety percent by weight. The silane can have a solid content ranging between approximately forty and forty-two percent active silane by weight.
The present invention further includes a method of making a coating, which in a preferred embodiment includes the steps of mixing fluorophosphate ester and the fluorosurfactant with polytetrafluoroethelene (PTFE) to create a fluorinated urea poluol. In a second step, the fluorinated urea poluol is converted again into a tetraethylfluoromethylacrylate, which is well suited for repelling water and stains. In either of the steps, one can add deionized water into the mixture to aid in the chemical reactions and conversions. An alternative to the method of the first preferred embodiment can also include the step of introducing a silane such as polytetraethoxysilane having a solid content within a predetermined range, which will enable the coating to last for a great number of years. Content ranges specified above for the coating are equally applicable in the method of making the coating.
As those of skill in the art will readily understand, the specific mixing times may be varied according to the mixing environment, temperature, humidity, air pressure, container characteristics and the desired functionality and/or features of the resulting coating, for example the desired hardness, chemical resistance, water repellant features and viscosity.
As a person skilled in the art will recognize from the previous detailed description and from the figures and claims, modifications and changes can be made to the preferred embodiments of the invention without departing from the scope of this invention defined in the following claims.
This application claims the benefit of U.S. Provisional Patent Application Ser. No. 61/031,689, filed Feb. 26, 2008, the disclosure of which is incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| 61031689 | Feb 2008 | US |
