Photocatalyst-binder compositions
First Claim
Patent Images
1. A self-cleaning composition comprising:
- particles of a photocatalyst responsive to ultraviolet light, said particles having a diameter of about 1-100 nm, said photocatalyst capable of catalyzing oxidation or reduction reactions to degrade organic compounds that contact the composition;
a binder for adhering said particles to a surface, said binder consisting essentially of a substantially non-oxidizable polymer having a backbone sequence of 12 or more atoms, where no more than one in six backbone atoms is carbon, the binder consisting of less than 20 wt % oxidizable carbon and hydrogen atoms;
wherein the particles are dispersed throughout said binder, and wherein the composition forms an abrasion-resistant, thermostable and adherent film when applied to a surface, the binder transmitting a substantial portion of incident ultraviolet light to activate the photocatalyst particles to produce cleaning effects.
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Abstract
A photocatalyst composition containing a substantially non-oxidizable binder which allows large amounts of photocatalytic particles to be adhered to a surface. Upon application to a surface, the composition dries or cures to form an adherent, abrasion-resistant, thermostable, and photocatalytic coating.
207 Citations
49 Claims
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1. A self-cleaning composition comprising:
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particles of a photocatalyst responsive to ultraviolet light, said particles having a diameter of about 1-100 nm, said photocatalyst capable of catalyzing oxidation or reduction reactions to degrade organic compounds that contact the composition; a binder for adhering said particles to a surface, said binder consisting essentially of a substantially non-oxidizable polymer having a backbone sequence of 12 or more atoms, where no more than one in six backbone atoms is carbon, the binder consisting of less than 20 wt % oxidizable carbon and hydrogen atoms; wherein the particles are dispersed throughout said binder, and wherein the composition forms an abrasion-resistant, thermostable and adherent film when applied to a surface, the binder transmitting a substantial portion of incident ultraviolet light to activate the photocatalyst particles to produce cleaning effects. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A self-cleaning composition comprising:
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particles of a photocatalyst responsive to ultraviolet light, said particles having a diameter of about 1-100 nm, said photocatalyst capable of catalyzing oxidation or reduction reactions to degrade organic compounds that contact the composition; a binder for adhering said particles to a surface, said binder consisting essentially of hydrated aluminum oxide, hydrated silicon oxide, colloidal tin dioxide, or mixtures thereof, wherein the particles are dispersed throughout said binder and wherein the composition forms an abrasion-resistant;
thermostable and adherent film when applied to a surface, the binder transmitting a substantial portion incident ultraviolet light to activate the photocatalyst particles to produce cleaning effects. - View Dependent Claims (27)
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20. A curable self-cleaning composition comprising:
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(a) ultraviolet light-absorbing photocatalyst particles having a surface area of at least about 30 m2 /g,; (b) a binder consisting essentially of a substantially non-oxidizable polymer, hydrated aluminum oxide, hydrated silicon oxide, colloidal tin oxide, or mixtures thereof, wherein the particles of the photocatalyst are dispersed in the binder, and wherein the binder transmits a substantial portion of incident ultraviolet light to activate the photocatalyst particles to produce cleaning effects. - View Dependent Claims (21, 22, 23)
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24. A self-cleaning composition comprising:
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particles of a photocatalyst responsive to ultraviolet light, said particles having a diameter of about 1-100 nm, said photocatalyst capable of catalyzing oxidation or reduction reactions to degrade organic compounds that contact the composition; a binder for adhering said particles to a surface, said binder consisting essentially of a substantially non-oxidizable polymer having a backbone sequence of 12 or more atoms, where no more than one in six backbone atoms is carbon, the binder consisting of less than 20 wt % oxidizable carbon and hydrogen atoms;
wherein the particles are dispersed throughout said binder; anda film-forming hydrophobic composition permeable to organic molecules and to molecular oxygen, wherein the composition dries to form an abrasion-resistant, thermostable and adherent film when applied to a surface, the binder transmitting a substantial portion of incident ultraviolet light to activate the photocatalyst particles to produce cleaning effects. - View Dependent Claims (25)
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26. A composite adhered to a surface, the composite comprising:
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a first layer consisting essentially of particles of a photocatalyst responsive to ultraviolet light dispersed in a substantially non-oxidizable binder, said particles having a diameter of about 1-100 nm, said photocatalyst capable of catalyzing oxidation or reduction reactions to degrade organic compounds, said binder consisting essentially of a substantially non-oxidizable polymer having a backbone sequence of 12 or more atoms, where no more than one in six backbone atoms is carbon, the binder consisting of less than 20 wt % oxidizable carbon and hydrogen atoms; and a second, hydrophobic layer permeable to organic molecules and to molecular oxygen.
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28. A self-cleaning composition comprising:
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particles of a photocatalyst responsive to ultraviolet light, said particles having a diameter of about 1-100 nm and a surface area at least about 30 m2 /g; and a substantially non-oxidizable binder for adhering particles to a surface, said binder consisting essentially of an inorganic colloid or a polymer having a backbone sequence of 12 or more atoms where no more than one in six backbone atoms is carbon, the binder having fewer than 20% by weight oxidizable carbon and hydrogen atoms, wherein the particles are dispersed in the binder and the composition forms an abrasion-resistant, thermostable and adherent film, the binder transmitting a substantial portion of incident ultraviolet light to activate the photocatalyst particles to produce cleaning effects. - View Dependent Claims (29, 30, 31)
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32. A self-cleaning composition comprising:
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particles of a photocatalyst responsive to ultraviolet light, said particles having a diameter of about 1-100 nm and a surface area at least about 30 m2 /g; and a substantially non-oxidizable binder for adhering said particles to a surface, wherein the particles are dispersed in the binder in the absence of photoactivity-masking agents, and wherein the composition forms an abrasion-resistant, thermostable and adherent film when applied to a surface, the binder transmitting a substantial portion of incident ultraviolet light to activate the photocatalyst particles to produce cleaning effects. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49)
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Specification