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US20080221263A1 - Coating compositions for producing transparent super-hydrophobic surfaces - Google Patents

Coating compositions for producing transparent super-hydrophobic surfaces Download PDF

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Publication number
US20080221263A1
US20080221263A1 US11/897,978 US89797807A US2008221263A1 US 20080221263 A1 US20080221263 A1 US 20080221263A1 US 89797807 A US89797807 A US 89797807A US 2008221263 A1 US2008221263 A1 US 2008221263A1
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composition
group
groups
coating composition
alkyl
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US11/897,978
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Inventor
Subbareddy Kanagasabapathy
Richard J. Baumgart
Wen-Chen Su
Frances E. Lockwood
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Ineos Composites IP LLC
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Individual
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Priority to US11/897,978 priority Critical patent/US20080221263A1/en
Assigned to ASHLAND LICENSING AND INTELLECTUAL PROPERTY, LLC, (ALIP) reassignment ASHLAND LICENSING AND INTELLECTUAL PROPERTY, LLC, (ALIP) ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BAUMGART, RICHARD J., KANAGASABAPATHY, SUBBAREDDY, LOCKWOOD, FRANCES E., SU, WEN-CHEN
Priority to PCT/US2008/006443 priority patent/WO2008153687A2/fr
Publication of US20080221263A1 publication Critical patent/US20080221263A1/en
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Assigned to ASHLAND LICENSING AND INTELLECTUAL PROPERTY LLC reassignment ASHLAND LICENSING AND INTELLECTUAL PROPERTY LLC ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KANNIAH, VINOD
Assigned to HERCULES INCORPORATED, AQUALON COMPANY, ASHLAND LICENSING AND INTELLECTUAL PROPERTY LLC reassignment HERCULES INCORPORATED RELEASE BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: BANK OF AMERICA, N.A., AS COLLATERAL AGENT
Assigned to BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT reassignment BANK OF AMERICA, N.A., AS ADMINISTRATIVE AGENT SECURITY AGREEMENT Assignors: AQUALON COMPANY, ASHLAND LICENSING AND INTELLECTUAL PROPERTY LLC, HERCULES INCORPORATED
Priority to US13/074,242 priority patent/US8338351B2/en
Assigned to ASHLAND LICENSING AND INTELLECTUAL PROPERTY LLC, AQUALON COMPANY, HERCULES INCORPORATED, ASHLAND, INC. reassignment ASHLAND LICENSING AND INTELLECTUAL PROPERTY LLC RELEASE OF PATENT SECURITY AGREEMENT Assignors: BANK OF AMERICA, N.A.
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/16—Antifouling paints; Underwater paints
    • C09D5/1606—Antifouling paints; Underwater paints characterised by the anti-fouling agent
    • C09D5/1612—Non-macromolecular compounds
    • C09D5/1618—Non-macromolecular compounds inorganic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/60—Additives non-macromolecular
    • C09D7/61—Additives non-macromolecular inorganic
    • C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40—Additives
    • C09D7/66—Additives characterised by particle size
    • C09D7/67—Particle size smaller than 100 nm
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/34—Silicon-containing compounds
    • C08K3/36—Silica
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
    • Y10T428/2991—Coated
    • Y10T428/2993—Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]
    • Y10T428/2995—Silane, siloxane or silicone coating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31652—Of asbestos
    • Y10T428/31663—As siloxane, silicone or silane

Definitions

  • the technical field of this invention is producing super hydrophobic coatings on surfaces.
  • the invention relates to protection of various surfaces from contaminants and from oxidation of surfaces in air and moisture.
  • One of the primary applications includes the use of this technology in vehicle appearance products.
  • products for similar applications are widely available on the market, these products often require rinsing with water after use and usually rely on a temporary hydrophilic surface.
  • water marks, smears or spots are left behind due to the deposits of minerals which were present as dissolved solids in water. This problem is apparent when cleaning glass, painted surfaces, steel, alloy, plastic or ceramic surfaces.
  • a means of solving this problem known in the literature is to dry the water from the surface using a cloth or chamois before the water marks form. However, this drying process is time consuming and requires considerable physical efforts.
  • U.S. Pat. No. 5,759,980 a composition
  • a surfactant package consisting of a silicone-based surfactant and a polymer which is capable of bonding to a surface to make a hydrophilic film which eliminates the problem of water marks.
  • this hydrophilic coating may tend to be removed from the surface by a single water rinse.
  • German publication DE-A21 61 591 also describes a composition for cleaning cars wherein the surface is again made hydrophilic by using amino functional polymers. This coating also tends to be rinsed off from a single rinse.
  • PCT WO97/48927 teaches a direct method of a cleaning composition, method of application and apparatus.
  • This reference describes using a spray gun comprising separate chambers for the cleaning solution and ion exchange resin. Moreover, it recommends to use purified rinse water which is expensive to use. There are number of waxes and other products available in the market for attempting to retain this spot free finish. Typically these products are designed to hydrophobically modify the surfaces after waxing so that the water will bead up on the hydrophobic surface. However, the hydrophobicity of the surfaces is not sufficient enough to bead the water completely from the surface thereby leaving the water spot when the water dries.
  • the present invention provides a coating composition and process for generating transparent, near-transparent, and semi-transparent super-hydrophobic coatings on surfaces having a contact angle of greater than 165 degrees.
  • One preferred composition comprises hydrophobic nanoparticles of silsesquioxanes containing adhesion promoter groups and low surface energy groups such as materials that contain fluoroalkyl groups, which reduce the surface energy due to its small atomic radius and high electronegativiity forming a stable covalent bond with carbon.
  • the silsesquioxane based composition provides a coating composition for generating transparent super-hydrophobic surfaces, comprising silsesquioxanes with I) an adhesion promoter, ii) low surface energy groups and to a process for producing such surfaces.
  • the coating utilizes hydrophobic nanoparticles of silsesquioxanes in a solvent.
  • the super hydrophobic coating composition that can be used to make wet and dry dirt repellent surfaces to keep the surfaces clean for a reasonable period of time.
  • the coating may utilize hydrophobic nanoparticles of silsesquioxanes in a solvent with an adhesion promoter. More particularly, the particle may be silicon based including, for example, silica, silicates and polysilsesquioxane.
  • a nanocomposite structure may be formed by casting, depositing or forming the material including nanocomposite particles.
  • the coating solves the problem of poor resistance to UV light and/or abrasion found in previous coatings of similar nature.
  • the transparent, near transparent, or semi-transparent coatings can be produced using the current invention whereas previous coatings of comparable hydrophobicity have all been white or opaque.
  • the coating can be applied by a single and easy spraying method and the super hydrophobic property can be achieved by drying the film at room temperature for 5 to 10 minutes.
  • a preferred coating has good resistance to UV light and some resistance to abrasion.
  • the present invention relates to a process and composition for creating super hydrophobic coatings (contact angle >165 degree) on various surfaces, preferably plastics, woods, metals, glass, ceramics, and painted and/or waxed surfaces.
  • super hydrophobic coatings of this type have recently been cited for the purpose of keeping surfaces cleaner, similar to the lotus plant, and the high contact angle is known as the “lotus effect””.
  • Examples of commercially available materials which attempt to produce this “Lotus” cleaning effect are products sold under the trade name of MINCOR available from BASF, and TEGTOP available from Degussa.
  • acrylic resins silicon containing graft copolymers, homopolymers, methyl methcyrlate, copolymers of acrylic monomers, styrene monomers, styrene copolymers, functional/non functional siloxanes, inorganic hybrids such as silsesquioxanes, acrylic polymers containing perfluoro pendant groups, TEFLON/nafion type fluoro polymers, urethanes, fluorourethanes, polyethers, polyesters and silicon modified polyacrylates, it was found that the resulting coating is initially super hydrophobic and may remain so for long periods indoors; however, when exposed to outdoor UV light, rubbed even slightly, or in general exposed to weather, the coating loses superhydrophobicity (which we define as the instant shedding of water with no remaining drops) becomes less hydrophobic within days or even hydrophilic and hence less useful for the object of the present invention.
  • superhydrophobicity which we define as the instant shedding of water with no remaining
  • the invention described herein provides a long lasting super hydrophobic coating that has the benefit of self cleaning of various surfaces and will reduce icing caused by water drops.
  • snow will cover horizontal surfaces but can be more easily removed from the surfaces protected with the coating formed from the composition of the present invention.
  • the coatings of the instant invention are inexpensive compared to paint and can be sprayed regularly if necessary to keep the surface clean without any further steps.
  • the static contact angle of a drop of liquid can be used to measure the wettability of surfaces.
  • the static contact angle can be defined as the angle enclosed by the surface and a tangent along the surface of the liquid drop in the region of the contact point of the liquid drop with the surface. The contact angle is measured through the liquid drop.
  • a contact angle of 0 defines complete wettability and does not form a drop.
  • a contact angle of 180 degrees defines complete unwettability.
  • the hydrophobic self-cleaning coating composition forms a dirt repellant film on a clear, translucent, or painted metal, wood, glass, or polymer substrate, comprising an effective amount of a silsesquioxanes in a solvent and combined with an adhesion promoter imparts a degree of hydrophobicity at ambient temperature to a coated surface providing a wetting surface having a contact angle of at least 165 degrees as compared to water having a contact angle of from 80 to 90 degrees on a noncoated surface and said composition imparting a degree of hydrophobicity to a coated surface providing a wetting surface having a tilt angle of sliding of less than 2 degrees as compared to water having a tilt angle of sliding of 90 degrees on a noncoated surface.
  • the hydrophobic self-cleaning coating composition forms a temporary dirt repellant film or coating on a clear, translucent, or painted metal, wood, glass, or polymer substrate, comprising an effective amount of a degree of hydrophobicity to a coated surface providing a wetting surface having a contact angle of at least 165 degrees as compared to water having a contact angle of from 80 to 90 degrees on a noncoated surface and said composition imparting a degree of hydrophobicity to a coated surface providing a wetting surface having a tilt angle of sliding of less than 2 degrees as compared to water having a tilt angle of sliding of 90 degrees on a noncoated surface.
  • the preferred embodiment utilizes organopolysiloxanes having an atomic ratio of oxygen to silicon of 1.5 are generally called polysilsesquioxanes.
  • Polysilsesquioxanes have a ladder-like structure as shown in FIG. 1 , wherein R is the same or different and is lower alkyl, phenyl, substituted phenyl, phenethyl and methylphenethyl, with at least one of the groups represented by R being lower alkyl, and n is an integer.
  • the contact angle is so large (greater than 165 degree) that it can not be measured by conventional instrumentation.
  • Another object of the present invention is to provide coatings that are practical in use, that do not degrade rapidly in sunlight, that can be readily applied, and have enough resistance to abrasion to survive for a practical length of time, at least between vehicle washes, and preferably for weeks or months depending upon environmental conditions to which the coating is exposed.
  • Another object of the present invention is to provide a process for applying such coatings.
  • Another object of the present invention is to use “lotus” coatings for a different purpose, to reduce drag.
  • compositions having a small amount of nanoparticles of silsesquioxanes with an adhesion promoter or other hydrophobic nanoparticle component with good UV light stability and good adhesion to metals, wood, glass, plastic, painted and many other surfaces.
  • the composition does not comprise any binding materials as taught in the prior art.
  • the nanoparticle containing compositions can be sprayed in a broad range of solid mixtures using VOC complaint solvents with aerosol propellants. The final uniform coating is obtained by drying the film at room temperature for 5 to 10 minutes.
  • nanoparticle enables the formulation of a composition without any binder which will produce a practical lotus effect that is not easily destroyed by fog, UV light, or abrasion, e.g. by flowing water.
  • FIG. 1 shows the chemical structure for a silsesquioxane.
  • FIG. 2 shows the typical contact angle of coated and uncoated area of a panel.
  • the present invention provides a coating composition which is super hydrophobic, and when applied on a surface, typically metal, fiberglass, plastic, ceramic, wood, glass, painted material, etc. produces a difficult to wet surface.
  • a coating composition which is super hydrophobic, and when applied on a surface, typically metal, fiberglass, plastic, ceramic, wood, glass, painted material, etc. produces a difficult to wet surface.
  • Contact angles of a liquid such as water on the coated surface should be difficult to measure with conventional means because the water droplet bounces or runs off the surface when applied. The contact angle exceeds 165 degrees and the tilt angle of sliding is less than 2 degrees.
  • the coatings in the examples are optimized formulations that contain super hydrophobic nanoparticles, for example, a silsesquioxane with an adhesion promoter.
  • a variety of nanoparticles will work if coated with a hydrophobic material, e.g. fumed silica and/or titania, perfluoroacrylic resins etc. only few polymers serve as an adequate base for the particles because the surface area of exposed polymer is vastly increased due to very thin film and rough surface area produced by the coating.
  • the present invention provides a formulation which can utilize nanoparticles in the composition without any binder to produce a practical lotus effect that is not easily destroyed by fog, UV light, or abrasion, or by flowing water.
  • This transparent, uniform film is stable when exposed outdoors to strong UV light, rain, wind, etc. for a minimum time of one month, compared to 3 days for most other polymers including acrylates, urethane acrylates, homopolymers and copolymers of ethylenically unsaturated monomers, acrylic acid/maleic anhydride copolymers etc. Stability is determined by observing that the super hydrophobic effect has not diminished and by examining the film under the microscope before and after exposure.
  • the substituted polysiloxane materials used in this invention include those with organic groups having from one to seven carbon atoms such that the substituted polysiloxanes have lower alkyls that provide an average of 0.3 to 1.5, preferably 0.5 to 1.3, carbon atoms per silicon atom.
  • Aqueous dispersions of lower alkyl substituted polysiloxanes of this invention can be prepared by hydrolysis of the corresponding alkyl substituted silanes by conventional methods.
  • the substituted polysiloxane material is a polysilsesquioxane.
  • Useful silsesquioxanes include (a) compounds having repeating units of the formula (RSiO[3/2]) where R is a substituent comprising a single alkyl or aryl group or mixtures of alkyl or aryl groups of carbon atoms, and/or (b) condensates of hydrolsylates of the formula R[x]Si(OR′)[y] where x+y is 4 and x is from 0 to 2 and y is from 2 to 4; R is a single alkyl or aryl group or mixture of alkyl or aryl groups comprising up to 7 carbon atoms, optionally substituted with halogen atoms, mercapto groups, and/or epoxy groups; and R′ is an alkyl radical with 1 to 4 carbon atoms.
  • silsesquioxanes are described in U.S. Pat. Nos. 3,493,424, 4,351,736 and 4,781,844, each incorporated herein by reference in its entirety.
  • the silsesquioxane materials can be any of the types described in U.S. Pat. No. 4,781,844 (Kortmann, et al), U.S. Pat. No. 4,351,736 (Steinberger et al.), U.S. Pat. No. 5,073,442 (Knowlton et al.) or U.S. Pat. No. 3,493,424 (Mohrlok et al.) each of which are incorporated herein by reference in its entirety.
  • the silsesquioxanes may be prepared by adding silanes to a mixture of water, a buffer, a surface active agent and optionally an organic solvent, while agitating the mixture under acidic or basic conditions. It is preferable to add the quantity of silane uniformly and slowly in order to achieve particles having an average size in the range of 300 to 1500 Angstroms.
  • the exact amount of silane that can be added depends on the substituent R and whether an anionic, non-ionic, or cationic surface active agent is used.
  • preferred surfactants include long chain alkyl ether sulfates which do not impart significant coloration. Some surfactants have been observed to result in yellowing of the resultant coating.
  • R 1 groups containing a component comprising an alkyl, aryl groups bonded directly to an Si atom of the silsesquioxane structure are preferably with carbon atom C 1 to C20 and up to C30, which may or may not having an additional moiety bonded thereto.
  • the additional moiety is preferably hydroxyl group, CF 3 , perfluoro groups.
  • Aryl groups substitute phenyl and benzyl groups.
  • the substituted groups are adhesion promoter and cross linking groups such as hydroxyl, amino, epoxy groups.
  • silanes are useful in preparing the polysiloxanes of the present invention: methyltrimethoxysilane, methyltriethoxysilane, methyltriisopropoxyoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, propyltrimethoxysilane, isobutyltrimethoxysilane, isobutyltriethoxysilane, 2-ethylbutyltriethoxysilane, tetraethoxysilane, mercaptopropyltrimethoxysilane, and 2-ethylbutoxytriethoxysilane fluoroalkylriethaoxysilane, hexadecyl troethoxysilane.
  • the nanoparticles composed of silsesquioxanes have a particle size ranging from about 7 to 600 nanometers.
  • hydrophobic silsesquioxane coating easier to apply it can be dispersed in solvents, preferably alcohol, acetone and or aliphatic hydrocarbons and/or other VOC complaint solvents to make it sprayable.
  • solvents preferably alcohol, acetone and or aliphatic hydrocarbons and/or other VOC complaint solvents to make it sprayable.
  • the solvent may also be selected from the group consisting of an alcohol, a hydrocarbon, mineral spirits, and water.
  • a preferred method of application is by diluting the solvent an aerosol containing a propellant such as carbon dioxide, a hydrocarbon (for example mixtures of propane isobutane), a fluorocarbon, difloroethane, and compressed air.
  • a propellant such as carbon dioxide, a hydrocarbon (for example mixtures of propane isobutane), a fluorocarbon, difloroethane, and compressed air.
  • a hydrocarbon for example mixtures of propane isobutane
  • fluorocarbon for example mixtures of propane isobutane
  • difloroethane difloroethane
  • compressed air compressed air.
  • One preferred hydrocarbon is a propane/isobutane.
  • a preferred embodiment of the present invention provides a coating composition for generating transparent super-hydrophobic surfaces, comprising silsesquioxanes with I) an adhesion promoter, ii) low surface energy groups and to a process for producing such surfaces.
  • one preferred adhesion promoter comprises a urethane polymer.
  • the coating utilizes hydrophobic nanoparticles of silsesquioxanes in a solvent.
  • a transparent coating (Haziness ⁇ 1%) can be produced using the current silsesquioxane and adhesion promoter composition whereas previous coatings of comparable hydrophobicity have all been white or opaque.
  • the coating can be applied by a single and easy spraying method and the super hydrophobic property can be achieved by drying the film at room temperature for 5 to 10 minutes.
  • a preferred coating has good resistance to UV light and some resistance to abrasion.
  • silsesquioxane Three (3) grams of silsesquioxane is dispersed in 97 grams of alcohol and mixed for 5 min. 0.1 grams of an adhesion promoter, for example, urethane polymer is added to the silsesquioxanes/alcohol dispersion and mixed for about 5 min. The whole mixture was sonicated for 5-50 seconds to generate uniform particle size.
  • an adhesion promoter for example, urethane polymer
  • Preferred adhesion promoters include urethane, polyurethane, acrylic polymers, siloxane, nitrogen containing materials, polyamides, carboxylic containing groups, polyamides with nitrogen groups and the like.
  • adhesion promoter groups applicable to the present composition include copolymers of (meth)acrylic acid with alkyl(meth)acrylates, alkenyl(meth)acrylates, aryl(meth)acrylates, alkylaryl(meth)acrylates, (meth)acrylonitrile or the like; terpolymers of (meth)acrylic acid with alkyl(meth)acrylates, alkenyl(meth)acrylates, aryl(meth)acrylates, alkylaryl(meth)acrylates, (meth)acrylonitrile, styrene and optionally substituted styrenes, vinyl acetate or the like; tetra or pentapolymers of (meth)acrylic acid with alkyl(meth)acrylates, alkenyl(meth)acrylates, aryl(meth)acrylates, alkylaryl(meth)acrylates, (meth)acrylonitrile, styrene and optionally substituted st
  • polymeric adhesion promoters which may be used are polyalkyl(meth)acrylates in which the alkyl group is, for example, methyl, ethyl, isopropyl, n-propyl, isobutyl, n-butyl, n-hexyl, 2-ethylhexyl, and the like, and binders are those which are insoluble in water, soluble in organic solvents, and partially soluble or swellable in aqueous alkaline solutions.
  • Adhesion promoters which contain hydroxyalkyl(meth)acrylates are very useful when further esterified with anhydrides such as crotonic anhydride, maleic anhydride, itaconic anhydride, and the like, and when esterified with acid chlorides such as acryloyl chloride, methacryloyl chloride, cinnamoyl chloride, and the like.
  • the polymers described above are particularly useful when the molecular weight is between 1000 and 300,000, more preferred between 5,000 and 200,000 and most preferred between 10,000 and 120,000. It is preferred that the acid number is between 5 and 300, more preferred between 10 and 250 and most preferred between 25 and 175.
  • compositions in accordance with the present invention provide examples of the range of ingredient percentages by weight providing an effective amount of the particular ingredients deemed necessary to obtain the desired results in single application.
  • Example 1 One preferred formula for the wax composition of the present invention is set forth in Example 1 as follows
  • compositions and the monomers choice were not limited to the monomers shown in examples. Any substituted trialkoxy silanes shown in FIG. 1 can be utilized to synthesis silsesquioxanes.
  • Coating Composition, B1 0.5 g of A1 was dispersed in 10 g of isopropyl alcohol and sonicated the whole mixture and applied to a painted surface by aerosol coating method.
  • the transparent, semi permanent coating showed contact angle of 168 degree.
  • B2 0.5 g of A2 was dispersed in 10 g of isopropylalcohol and sonicated the whole mixture and applied to a painted surface by aerosol coating method.
  • the semi permanent coating showed contact angle of 157 degree, however the transparency was lost completely.
  • B3 0.5 g of A3 was dispersed in 10 g of isopropylalcohol and sonicated the whole mixture and applied to a painted surface by aerosol coating method.
  • the transparent, semi permanent coating showed contact angle of 172 degree.
  • B4 0.5 g of A4 was dispersed in 10 g of isopropylalcohol and sonicated the whole mixture and applied to a painted surface by aerosol coating method.
  • the transparent, semi permanent coating showed contact angle of 168 degree.

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US11/897,978 2006-01-30 2007-08-31 Coating compositions for producing transparent super-hydrophobic surfaces Abandoned US20080221263A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US11/897,978 US20080221263A1 (en) 2006-08-31 2007-08-31 Coating compositions for producing transparent super-hydrophobic surfaces
PCT/US2008/006443 WO2008153687A2 (fr) 2007-05-24 2008-05-20 Composition de revêtement hydrophobe auto-nettoyant
US13/074,242 US8338351B2 (en) 2006-01-30 2011-03-29 Coating compositions for producing transparent super-hydrophobic surfaces

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US84172006P 2006-08-31 2006-08-31
US93154507P 2007-05-24 2007-05-24
US11/897,978 US20080221263A1 (en) 2006-08-31 2007-08-31 Coating compositions for producing transparent super-hydrophobic surfaces

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US11/699,883 Continuation-In-Part US20090018249A1 (en) 2006-01-30 2007-01-30 Hydrophobic self-cleaning coating compositions

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