Photocatalyst-binder compositions
First Claim
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1. A composition comprising:
- particles of a photocatalyst activated by light, said particles having a diameter of about 1-100 nm and a surface area of at least 30 m2 /g;
said photocatalyst capable of catalyzing oxidation or reduction reactions;
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 activating light to activate the photocatalyst particles;
said composition, when applied to a surface and in contact with an organic compound, being Effective, in the presence of activating light, to degrade at least a portion of said organic compound.
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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.
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Citations
32 Claims
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1. A composition comprising:
particles of a photocatalyst activated by light, said particles having a diameter of about 1-100 nm and a surface area of at least 30 m2 /g;
said photocatalyst capable of catalyzing oxidation or reduction reactions;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 activating light to activate the photocatalyst particles; said composition, when applied to a surface and in contact with an organic compound, being Effective, in the presence of activating light, to degrade at least a portion of said organic compound. - View Dependent Claims (2, 4, 5, 6, 7, 12, 13, 14, 15, 16)
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3. A composition comprising:
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particles of a photocatalyst activated by light, said particles having a diameter of about 1-100 nm, said photocatalyst capable of catalyzing oxidation or reduction reactions; 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 of the activating light to activate the photocatalyst particles; said composition, when applied to a surface and in contact with an organic compound, being effective, in the presence of activating light, to degrade at least a portion of said organic compound.
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8. A curable composition comprising;
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(a) light-activated 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 activating light to activate the photocatalyst particles; said composition, when applied to a surface and in contact with an organic compound, being effective, in the presence of activating light, to degrade at least a portion of said organic compound. - View Dependent Claims (9, 10, 11)
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17. A composition comprising:
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particles of a photocatalyst responsive to activating 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, 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 activating light to activate the photocatalyst particles; said composition, when applied to a surface and in contact with an organic compound, being effective, in the presence of activating light, to degrade at least a portion of said organic compound. - View Dependent Claims (18, 19, 20)
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21. A composition comprising:
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particles of a photocatalyst activated by 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 arc 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 activating light to activate the photocatalyst particles; said composition, when applied to a surface and in contact with an organic compound, being effective, in the presence of activating light to degrade at least a portion of said organic compound. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification